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// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import { UD60x18, ud } from "@prb/math/src/UD60x18.sol";

import { SablierV2Lockup } from "./abstracts/SablierV2Lockup.sol";
import { ISablierV2Comptroller } from "./interfaces/ISablierV2Comptroller.sol";
import { ISablierV2Lockup } from "./interfaces/ISablierV2Lockup.sol";
import { ISablierV2LockupLinear } from "./interfaces/ISablierV2LockupLinear.sol";
import { ISablierV2NFTDescriptor } from "./interfaces/ISablierV2NFTDescriptor.sol";
import { ISablierV2LockupRecipient } from "./interfaces/hooks/ISablierV2LockupRecipient.sol";
import { Errors } from "./libraries/Errors.sol";
import { Helpers } from "./libraries/Helpers.sol";
import { Lockup, LockupLinear } from "./types/DataTypes.sol";

/*

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*/

/// @title SablierV2LockupLinear
/// @notice See the documentation in {ISablierV2LockupLinear}.
contract SablierV2LockupLinear is
    ISablierV2LockupLinear, // 5 inherited components
    SablierV2Lockup // 14 inherited components
{
    using SafeERC20 for IERC20;

    /*//////////////////////////////////////////////////////////////////////////
                                  PRIVATE STORAGE
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Sablier V2 Lockup Linear streams mapped by unsigned integers.
    mapping(uint256 id => LockupLinear.Stream stream) private _streams;

    /*//////////////////////////////////////////////////////////////////////////
                                     CONSTRUCTOR
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Emits a {TransferAdmin} event.
    /// @param initialAdmin The address of the initial contract admin.
    /// @param initialComptroller The address of the initial comptroller.
    /// @param initialNFTDescriptor The address of the initial NFT descriptor.
    constructor(
        address initialAdmin,
        ISablierV2Comptroller initialComptroller,
        ISablierV2NFTDescriptor initialNFTDescriptor
    )
        ERC721("Sablier V2 Lockup Linear NFT", "SAB-V2-LOCKUP-LIN")
        SablierV2Lockup(initialAdmin, initialComptroller, initialNFTDescriptor)
    {
        nextStreamId = 1;
    }

    /*//////////////////////////////////////////////////////////////////////////
                           USER-FACING CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2Lockup
    function getAsset(uint256 streamId) external view override notNull(streamId) returns (IERC20 asset) {
        asset = _streams[streamId].asset;
    }

    /// @inheritdoc ISablierV2LockupLinear
    function getCliffTime(uint256 streamId) external view override notNull(streamId) returns (uint40 cliffTime) {
        cliffTime = _streams[streamId].cliffTime;
    }

    /// @inheritdoc ISablierV2Lockup
    function getDepositedAmount(uint256 streamId)
        external
        view
        override
        notNull(streamId)
        returns (uint128 depositedAmount)
    {
        depositedAmount = _streams[streamId].amounts.deposited;
    }

    /// @inheritdoc ISablierV2Lockup
    function getEndTime(uint256 streamId) external view override notNull(streamId) returns (uint40 endTime) {
        endTime = _streams[streamId].endTime;
    }

    /// @inheritdoc ISablierV2LockupLinear
    function getRange(uint256 streamId)
        external
        view
        override
        notNull(streamId)
        returns (LockupLinear.Range memory range)
    {
        range = LockupLinear.Range({
            start: _streams[streamId].startTime,
            cliff: _streams[streamId].cliffTime,
            end: _streams[streamId].endTime
        });
    }

    /// @inheritdoc ISablierV2Lockup
    function getRefundedAmount(uint256 streamId)
        external
        view
        override
        notNull(streamId)
        returns (uint128 refundedAmount)
    {
        refundedAmount = _streams[streamId].amounts.refunded;
    }

    /// @inheritdoc ISablierV2Lockup
    function getSender(uint256 streamId) external view override notNull(streamId) returns (address sender) {
        sender = _streams[streamId].sender;
    }

    /// @inheritdoc ISablierV2Lockup
    function getStartTime(uint256 streamId) external view override notNull(streamId) returns (uint40 startTime) {
        startTime = _streams[streamId].startTime;
    }

    /// @inheritdoc ISablierV2LockupLinear
    function getStream(uint256 streamId)
        external
        view
        override
        notNull(streamId)
        returns (LockupLinear.Stream memory stream)
    {
        stream = _streams[streamId];

        // Settled streams cannot be canceled.
        if (_statusOf(streamId) == Lockup.Status.SETTLED) {
            stream.isCancelable = false;
        }
    }

    /// @inheritdoc ISablierV2Lockup
    function getWithdrawnAmount(uint256 streamId)
        external
        view
        override
        notNull(streamId)
        returns (uint128 withdrawnAmount)
    {
        withdrawnAmount = _streams[streamId].amounts.withdrawn;
    }

    /// @inheritdoc ISablierV2Lockup
    function isCancelable(uint256 streamId) external view override notNull(streamId) returns (bool result) {
        if (_statusOf(streamId) != Lockup.Status.SETTLED) {
            result = _streams[streamId].isCancelable;
        }
    }

    /// @inheritdoc SablierV2Lockup
    function isTransferable(uint256 streamId)
        public
        view
        override(ISablierV2Lockup, SablierV2Lockup)
        notNull(streamId)
        returns (bool result)
    {
        result = _streams[streamId].isTransferable;
    }

    /// @inheritdoc ISablierV2Lockup
    function isDepleted(uint256 streamId)
        public
        view
        override(ISablierV2Lockup, SablierV2Lockup)
        notNull(streamId)
        returns (bool result)
    {
        result = _streams[streamId].isDepleted;
    }

    /// @inheritdoc ISablierV2Lockup
    function isStream(uint256 streamId) public view override(ISablierV2Lockup, SablierV2Lockup) returns (bool result) {
        result = _streams[streamId].isStream;
    }

    /// @inheritdoc ISablierV2Lockup
    function refundableAmountOf(uint256 streamId)
        external
        view
        override
        notNull(streamId)
        returns (uint128 refundableAmount)
    {
        // These checks are needed because {_calculateStreamedAmount} does not look up the stream's status. Note that
        // checking for `isCancelable` also checks if the stream `wasCanceled` thanks to the protocol invariant that
        // canceled streams are not cancelable anymore.
        if (_streams[streamId].isCancelable && !_streams[streamId].isDepleted) {
            refundableAmount = _streams[streamId].amounts.deposited - _calculateStreamedAmount(streamId);
        }
        // Otherwise, the result is implicitly zero.
    }

    /// @inheritdoc ISablierV2Lockup
    function statusOf(uint256 streamId) external view override notNull(streamId) returns (Lockup.Status status) {
        status = _statusOf(streamId);
    }

    /// @inheritdoc ISablierV2LockupLinear
    function streamedAmountOf(uint256 streamId)
        public
        view
        override(ISablierV2Lockup, ISablierV2LockupLinear)
        notNull(streamId)
        returns (uint128 streamedAmount)
    {
        streamedAmount = _streamedAmountOf(streamId);
    }

    /// @inheritdoc ISablierV2Lockup
    function wasCanceled(uint256 streamId)
        public
        view
        override(ISablierV2Lockup, SablierV2Lockup)
        notNull(streamId)
        returns (bool result)
    {
        result = _streams[streamId].wasCanceled;
    }

    /*//////////////////////////////////////////////////////////////////////////
                         USER-FACING NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2LockupLinear
    function createWithDurations(LockupLinear.CreateWithDurations calldata params)
        external
        override
        noDelegateCall
        returns (uint256 streamId)
    {
        // Set the current block timestamp as the stream's start time.
        LockupLinear.Range memory range;
        range.start = uint40(block.timestamp);

        // Calculate the cliff time and the end time. It is safe to use unchecked arithmetic because
        // {_createWithRange} will nonetheless check that the end time is greater than the cliff time,
        // and also that the cliff time is greater than or equal to the start time.
        unchecked {
            range.cliff = range.start + params.durations.cliff;
            range.end = range.start + params.durations.total;
        }
        // Checks, Effects and Interactions: create the stream.
        streamId = _createWithRange(
            LockupLinear.CreateWithRange({
                asset: params.asset,
                broker: params.broker,
                cancelable: params.cancelable,
                transferable: params.transferable,
                range: range,
                recipient: params.recipient,
                sender: params.sender,
                totalAmount: params.totalAmount
            })
        );
    }

    /// @inheritdoc ISablierV2LockupLinear
    function createWithRange(LockupLinear.CreateWithRange calldata params)
        external
        override
        noDelegateCall
        returns (uint256 streamId)
    {
        // Checks, Effects and Interactions: create the stream.
        streamId = _createWithRange(params);
    }

    /*//////////////////////////////////////////////////////////////////////////
                           INTERNAL CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Calculates the streamed amount without looking up the stream's status.
    function _calculateStreamedAmount(uint256 streamId) internal view returns (uint128) {
        // If the cliff time is in the future, return zero.
        uint256 cliffTime = uint256(_streams[streamId].cliffTime);
        uint256 currentTime = block.timestamp;
        if (cliffTime > currentTime) {
            return 0;
        }

        // If the end time is not in the future, return the deposited amount.
        uint256 endTime = uint256(_streams[streamId].endTime);
        if (currentTime >= endTime) {
            return _streams[streamId].amounts.deposited;
        }

        // In all other cases, calculate the amount streamed so far. Normalization to 18 decimals is not needed
        // because there is no mix of amounts with different decimals.
        unchecked {
            // Calculate how much time has passed since the stream started, and the stream's total duration.
            uint256 startTime = uint256(_streams[streamId].startTime);
            UD60x18 elapsedTime = ud(currentTime - startTime);
            UD60x18 totalTime = ud(endTime - startTime);

            // Divide the elapsed time by the stream's total duration.
            UD60x18 elapsedTimePercentage = elapsedTime.div(totalTime);

            // Cast the deposited amount to UD60x18.
            UD60x18 depositedAmount = ud(_streams[streamId].amounts.deposited);

            // Calculate the streamed amount by multiplying the elapsed time percentage by the deposited amount.
            UD60x18 streamedAmount = elapsedTimePercentage.mul(depositedAmount);

            // Although the streamed amount should never exceed the deposited amount, this condition is checked
            // without asserting to avoid locking funds in case of a bug. If this situation occurs, the withdrawn
            // amount is considered to be the streamed amount, and the stream is effectively frozen.
            if (streamedAmount.gt(depositedAmount)) {
                return _streams[streamId].amounts.withdrawn;
            }

            // Cast the streamed amount to uint128. This is safe due to the check above.
            return uint128(streamedAmount.intoUint256());
        }
    }

    /// @inheritdoc SablierV2Lockup
    function _isCallerStreamSender(uint256 streamId) internal view override returns (bool) {
        return msg.sender == _streams[streamId].sender;
    }

    /// @inheritdoc SablierV2Lockup
    function _statusOf(uint256 streamId) internal view override returns (Lockup.Status) {
        if (_streams[streamId].isDepleted) {
            return Lockup.Status.DEPLETED;
        } else if (_streams[streamId].wasCanceled) {
            return Lockup.Status.CANCELED;
        }

        if (block.timestamp < _streams[streamId].startTime) {
            return Lockup.Status.PENDING;
        }

        if (_calculateStreamedAmount(streamId) < _streams[streamId].amounts.deposited) {
            return Lockup.Status.STREAMING;
        } else {
            return Lockup.Status.SETTLED;
        }
    }

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _streamedAmountOf(uint256 streamId) internal view returns (uint128) {
        Lockup.Amounts memory amounts = _streams[streamId].amounts;

        if (_streams[streamId].isDepleted) {
            return amounts.withdrawn;
        } else if (_streams[streamId].wasCanceled) {
            return amounts.deposited - amounts.refunded;
        }

        return _calculateStreamedAmount(streamId);
    }

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _withdrawableAmountOf(uint256 streamId) internal view override returns (uint128) {
        return _streamedAmountOf(streamId) - _streams[streamId].amounts.withdrawn;
    }

    /*//////////////////////////////////////////////////////////////////////////
                           INTERNAL NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _cancel(uint256 streamId) internal override {
        // Calculate the streamed amount.
        uint128 streamedAmount = _calculateStreamedAmount(streamId);

        // Retrieve the amounts from storage.
        Lockup.Amounts memory amounts = _streams[streamId].amounts;

        // Checks: the stream is not settled.
        if (streamedAmount >= amounts.deposited) {
            revert Errors.SablierV2Lockup_StreamSettled(streamId);
        }

        // Checks: the stream is cancelable.
        if (!_streams[streamId].isCancelable) {
            revert Errors.SablierV2Lockup_StreamNotCancelable(streamId);
        }

        // Calculate the sender's and the recipient's amount.
        uint128 senderAmount = amounts.deposited - streamedAmount;
        uint128 recipientAmount = streamedAmount - amounts.withdrawn;

        // Effects: mark the stream as canceled.
        _streams[streamId].wasCanceled = true;

        // Effects: make the stream not cancelable anymore, because a stream can only be canceled once.
        _streams[streamId].isCancelable = false;

        // Effects: If there are no assets left for the recipient to withdraw, mark the stream as depleted.
        if (recipientAmount == 0) {
            _streams[streamId].isDepleted = true;
        }

        // Effects: set the refunded amount.
        _streams[streamId].amounts.refunded = senderAmount;

        // Retrieve the sender and the recipient from storage.
        address sender = _streams[streamId].sender;
        address recipient = _ownerOf(streamId);

        // Retrieve the ERC-20 asset from storage.
        IERC20 asset = _streams[streamId].asset;

        // Interactions: refund the sender.
        asset.safeTransfer({ to: sender, value: senderAmount });

        // Log the cancellation.
        emit ISablierV2Lockup.CancelLockupStream(streamId, sender, recipient, asset, senderAmount, recipientAmount);

        // Emits an ERC-4906 event to trigger an update of the NFT metadata.
        emit MetadataUpdate({ _tokenId: streamId });

        // Interactions: if the recipient is a contract, try to invoke the cancel hook on the recipient without
        // reverting if the hook is not implemented, and without bubbling up any potential revert.
        if (recipient.code.length > 0) {
            try ISablierV2LockupRecipient(recipient).onStreamCanceled({
                streamId: streamId,
                sender: sender,
                senderAmount: senderAmount,
                recipientAmount: recipientAmount
            }) { } catch { }
        }
    }

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _createWithRange(LockupLinear.CreateWithRange memory params) internal returns (uint256 streamId) {
        // Safe Interactions: query the protocol fee. This is safe because it's a known Sablier contract that does
        // not call other unknown contracts.
        UD60x18 protocolFee = comptroller.protocolFees(params.asset);

        // Checks: check the fees and calculate the fee amounts.
        Lockup.CreateAmounts memory createAmounts =
            Helpers.checkAndCalculateFees(params.totalAmount, protocolFee, params.broker.fee, MAX_FEE);

        // Checks: validate the user-provided parameters.
        Helpers.checkCreateWithRange(createAmounts.deposit, params.range);

        // Load the stream id.
        streamId = nextStreamId;

        // Effects: create the stream.
        _streams[streamId] = LockupLinear.Stream({
            amounts: Lockup.Amounts({ deposited: createAmounts.deposit, refunded: 0, withdrawn: 0 }),
            asset: params.asset,
            cliffTime: params.range.cliff,
            endTime: params.range.end,
            isCancelable: params.cancelable,
            isTransferable: params.transferable,
            isDepleted: false,
            isStream: true,
            sender: params.sender,
            startTime: params.range.start,
            wasCanceled: false
        });

        // Effects: bump the next stream id and record the protocol fee.
        // Using unchecked arithmetic because these calculations cannot realistically overflow, ever.
        unchecked {
            nextStreamId = streamId + 1;
            protocolRevenues[params.asset] = protocolRevenues[params.asset] + createAmounts.protocolFee;
        }

        // Effects: mint the NFT to the recipient.
        _mint({ to: params.recipient, tokenId: streamId });

        // Interactions: transfer the deposit and the protocol fee.
        // Using unchecked arithmetic because the deposit and the protocol fee are bounded by the total amount.
        unchecked {
            params.asset.safeTransferFrom({
                from: msg.sender,
                to: address(this),
                value: createAmounts.deposit + createAmounts.protocolFee
            });
        }

        // Interactions: pay the broker fee, if not zero.
        if (createAmounts.brokerFee > 0) {
            params.asset.safeTransferFrom({ from: msg.sender, to: params.broker.account, value: createAmounts.brokerFee });
        }

        // Log the newly created stream.
        emit ISablierV2LockupLinear.CreateLockupLinearStream({
            streamId: streamId,
            funder: msg.sender,
            sender: params.sender,
            recipient: params.recipient,
            amounts: createAmounts,
            asset: params.asset,
            cancelable: params.cancelable,
            transferable: params.transferable,
            range: params.range,
            broker: params.broker.account
        });
    }

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _renounce(uint256 streamId) internal override {
        // Checks: the stream is cancelable.
        if (!_streams[streamId].isCancelable) {
            revert Errors.SablierV2Lockup_StreamNotCancelable(streamId);
        }

        // Effects: renounce the stream by making it not cancelable.
        _streams[streamId].isCancelable = false;
    }

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _withdraw(uint256 streamId, address to, uint128 amount) internal override {
        // Effects: update the withdrawn amount.
        _streams[streamId].amounts.withdrawn = _streams[streamId].amounts.withdrawn + amount;

        // Retrieve the amounts from storage.
        Lockup.Amounts memory amounts = _streams[streamId].amounts;

        // Using ">=" instead of "==" for additional safety reasons. In the event of an unforeseen increase in the
        // withdrawn amount, the stream will still be marked as depleted.
        if (amounts.withdrawn >= amounts.deposited - amounts.refunded) {
            // Effects: mark the stream as depleted.
            _streams[streamId].isDepleted = true;

            // Effects: make the stream not cancelable anymore, because a depleted stream cannot be canceled.
            _streams[streamId].isCancelable = false;
        }

        // Retrieve the ERC-20 asset from storage.
        IERC20 asset = _streams[streamId].asset;

        // Interactions: perform the ERC-20 transfer.
        asset.safeTransfer({ to: to, value: amount });

        // Log the withdrawal.
        emit ISablierV2Lockup.WithdrawFromLockupStream(streamId, to, asset, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

/*

██████╗ ██████╗ ██████╗ ███╗   ███╗ █████╗ ████████╗██╗  ██╗
██╔══██╗██╔══██╗██╔══██╗████╗ ████║██╔══██╗╚══██╔══╝██║  ██║
██████╔╝██████╔╝██████╔╝██╔████╔██║███████║   ██║   ███████║
██╔═══╝ ██╔══██╗██╔══██╗██║╚██╔╝██║██╔══██║   ██║   ██╔══██║
██║     ██║  ██║██████╔╝██║ ╚═╝ ██║██║  ██║   ██║   ██║  ██║
╚═╝     ╚═╝  ╚═╝╚═════╝ ╚═╝     ╚═╝╚═╝  ╚═╝   ╚═╝   ╚═╝  ╚═╝

██╗   ██╗██████╗  ██████╗  ██████╗ ██╗  ██╗ ██╗ █████╗
██║   ██║██╔══██╗██╔════╝ ██╔═████╗╚██╗██╔╝███║██╔══██╗
██║   ██║██║  ██║███████╗ ██║██╔██║ ╚███╔╝ ╚██║╚█████╔╝
██║   ██║██║  ██║██╔═══██╗████╔╝██║ ██╔██╗  ██║██╔══██╗
╚██████╔╝██████╔╝╚██████╔╝╚██████╔╝██╔╝ ██╗ ██║╚█████╔╝
 ╚═════╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═╝ ╚═╝ ╚════╝

*/

import "./ud60x18/Casting.sol";
import "./ud60x18/Constants.sol";
import "./ud60x18/Conversions.sol";
import "./ud60x18/Errors.sol";
import "./ud60x18/Helpers.sol";
import "./ud60x18/Math.sol";
import "./ud60x18/ValueType.sol";

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.19;

import { IERC4906 } from "@openzeppelin/contracts/interfaces/IERC4906.sol";
import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import { IERC721Metadata } from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";

import { ISablierV2Comptroller } from "../interfaces/ISablierV2Comptroller.sol";
import { ISablierV2Lockup } from "../interfaces/ISablierV2Lockup.sol";
import { ISablierV2NFTDescriptor } from "../interfaces/ISablierV2NFTDescriptor.sol";
import { ISablierV2LockupRecipient } from "../interfaces/hooks/ISablierV2LockupRecipient.sol";
import { Errors } from "../libraries/Errors.sol";
import { Lockup } from "../types/DataTypes.sol";
import { SablierV2Base } from "./SablierV2Base.sol";

/// @title SablierV2Lockup
/// @notice See the documentation in {ISablierV2Lockup}.
abstract contract SablierV2Lockup is
    IERC4906, // 2 inherited components
    SablierV2Base, // 4 inherited components
    ISablierV2Lockup, // 4 inherited components
    ERC721 // 6 inherited components
{
    /*//////////////////////////////////////////////////////////////////////////
                                USER-FACING STORAGE
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2Lockup
    uint256 public override nextStreamId;

    /*//////////////////////////////////////////////////////////////////////////
                                  INTERNAL STORAGE
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Contract that generates the non-fungible token URI.
    ISablierV2NFTDescriptor internal _nftDescriptor;

    /*//////////////////////////////////////////////////////////////////////////
                                     CONSTRUCTOR
    //////////////////////////////////////////////////////////////////////////*/

    /// @param initialAdmin The address of the initial contract admin.
    /// @param initialComptroller The address of the initial comptroller.
    /// @param initialNFTDescriptor The address of the initial NFT descriptor.
    constructor(
        address initialAdmin,
        ISablierV2Comptroller initialComptroller,
        ISablierV2NFTDescriptor initialNFTDescriptor
    )
        SablierV2Base(initialAdmin, initialComptroller)
    {
        _nftDescriptor = initialNFTDescriptor;
    }

    /*//////////////////////////////////////////////////////////////////////////
                                      MODIFIERS
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Checks that `streamId` does not reference a null stream.
    modifier notNull(uint256 streamId) {
        if (!isStream(streamId)) {
            revert Errors.SablierV2Lockup_Null(streamId);
        }
        _;
    }

    /// @dev Emits an ERC-4906 event to trigger an update of the NFT metadata.
    modifier updateMetadata(uint256 streamId) {
        _;
        emit MetadataUpdate({ _tokenId: streamId });
    }

    /*//////////////////////////////////////////////////////////////////////////
                           USER-FACING CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2Lockup
    function getRecipient(uint256 streamId) external view override returns (address recipient) {
        // Checks: the stream NFT exists.
        _requireMinted({ tokenId: streamId });

        // The NFT owner is the stream's recipient.
        recipient = _ownerOf(streamId);
    }

    /// @inheritdoc ISablierV2Lockup
    function isCold(uint256 streamId) external view override notNull(streamId) returns (bool result) {
        Lockup.Status status = _statusOf(streamId);
        result = status == Lockup.Status.SETTLED || status == Lockup.Status.CANCELED || status == Lockup.Status.DEPLETED;
    }

    /// @inheritdoc ISablierV2Lockup
    function isDepleted(uint256 streamId) public view virtual override returns (bool result);

    /// @inheritdoc ISablierV2Lockup
    function isStream(uint256 streamId) public view virtual override returns (bool result);

    /// @inheritdoc ISablierV2Lockup
    function isWarm(uint256 streamId) external view override notNull(streamId) returns (bool result) {
        Lockup.Status status = _statusOf(streamId);
        result = status == Lockup.Status.PENDING || status == Lockup.Status.STREAMING;
    }

    /// @inheritdoc ERC721
    function tokenURI(uint256 streamId) public view override(IERC721Metadata, ERC721) returns (string memory uri) {
        // Checks: the stream NFT exists.
        _requireMinted({ tokenId: streamId });

        // Generate the URI describing the stream NFT.
        uri = _nftDescriptor.tokenURI({ sablier: this, streamId: streamId });
    }

    /// @inheritdoc ISablierV2Lockup
    function wasCanceled(uint256 streamId) public view virtual override returns (bool result);

    /// @inheritdoc ISablierV2Lockup
    function withdrawableAmountOf(uint256 streamId)
        external
        view
        override
        notNull(streamId)
        returns (uint128 withdrawableAmount)
    {
        withdrawableAmount = _withdrawableAmountOf(streamId);
    }

    /// @inheritdoc ISablierV2Lockup
    function isTransferable(uint256 streamId) public view virtual returns (bool);

    /*//////////////////////////////////////////////////////////////////////////
                         USER-FACING NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2Lockup
    function burn(uint256 streamId) external override noDelegateCall {
        // Checks: only depleted streams can be burned. This also checks that the stream is not null.
        if (!isDepleted(streamId)) {
            revert Errors.SablierV2Lockup_StreamNotDepleted(streamId);
        }

        // Checks:
        // 1. NFT exists (see {IERC721.getApproved}).
        // 2. `msg.sender` is either the owner of the NFT or an approved third party.
        if (!_isCallerStreamRecipientOrApproved(streamId)) {
            revert Errors.SablierV2Lockup_Unauthorized(streamId, msg.sender);
        }

        // Effects: burn the NFT.
        _burn({ tokenId: streamId });
    }

    /// @inheritdoc ISablierV2Lockup
    function cancel(uint256 streamId) public override noDelegateCall {
        // Checks: the stream is neither depleted nor canceled. This also checks that the stream is not null.
        if (isDepleted(streamId)) {
            revert Errors.SablierV2Lockup_StreamDepleted(streamId);
        } else if (wasCanceled(streamId)) {
            revert Errors.SablierV2Lockup_StreamCanceled(streamId);
        }

        // Checks: `msg.sender` is the stream's sender.
        if (!_isCallerStreamSender(streamId)) {
            revert Errors.SablierV2Lockup_Unauthorized(streamId, msg.sender);
        }

        // Checks, Effects and Interactions: cancel the stream.
        _cancel(streamId);
    }

    /// @inheritdoc ISablierV2Lockup
    function cancelMultiple(uint256[] calldata streamIds) external override noDelegateCall {
        // Iterate over the provided array of stream ids and cancel each stream.
        uint256 count = streamIds.length;
        for (uint256 i = 0; i < count;) {
            // Effects and Interactions: cancel the stream.
            cancel(streamIds[i]);

            // Increment the loop iterator.
            unchecked {
                i += 1;
            }
        }
    }

    /// @inheritdoc ISablierV2Lockup
    function renounce(uint256 streamId) external override noDelegateCall notNull(streamId) updateMetadata(streamId) {
        // Checks: the stream is not cold.
        Lockup.Status status = _statusOf(streamId);
        if (status == Lockup.Status.DEPLETED) {
            revert Errors.SablierV2Lockup_StreamDepleted(streamId);
        } else if (status == Lockup.Status.CANCELED) {
            revert Errors.SablierV2Lockup_StreamCanceled(streamId);
        } else if (status == Lockup.Status.SETTLED) {
            revert Errors.SablierV2Lockup_StreamSettled(streamId);
        }

        // Checks: `msg.sender` is the stream's sender.
        if (!_isCallerStreamSender(streamId)) {
            revert Errors.SablierV2Lockup_Unauthorized(streamId, msg.sender);
        }

        // Checks and Effects: renounce the stream.
        _renounce(streamId);

        // Log the renouncement.
        emit ISablierV2Lockup.RenounceLockupStream(streamId);

        // Interactions: if the recipient is a contract, try to invoke the renounce hook on the recipient without
        // reverting if the hook is not implemented, and also without bubbling up any potential revert.
        address recipient = _ownerOf(streamId);
        if (recipient.code.length > 0) {
            try ISablierV2LockupRecipient(recipient).onStreamRenounced(streamId) { } catch { }
        }
    }

    /// @inheritdoc ISablierV2Lockup
    function setNFTDescriptor(ISablierV2NFTDescriptor newNFTDescriptor) external override onlyAdmin {
        // Effects: set the NFT descriptor.
        ISablierV2NFTDescriptor oldNftDescriptor = _nftDescriptor;
        _nftDescriptor = newNFTDescriptor;

        // Log the change of the NFT descriptor.
        emit ISablierV2Lockup.SetNFTDescriptor({
            admin: msg.sender,
            oldNFTDescriptor: oldNftDescriptor,
            newNFTDescriptor: newNFTDescriptor
        });

        // Refresh the NFT metadata for all streams.
        emit BatchMetadataUpdate({ _fromTokenId: 1, _toTokenId: nextStreamId - 1 });
    }

    /// @inheritdoc ISablierV2Lockup
    function withdraw(
        uint256 streamId,
        address to,
        uint128 amount
    )
        public
        override
        noDelegateCall
        updateMetadata(streamId)
    {
        // Checks: the stream is not depleted. This also checks that the stream is not null.
        if (isDepleted(streamId)) {
            revert Errors.SablierV2Lockup_StreamDepleted(streamId);
        }

        bool isCallerStreamSender = _isCallerStreamSender(streamId);

        // Checks: `msg.sender` is the stream's sender, the stream's recipient, or an approved third party.
        if (!isCallerStreamSender && !_isCallerStreamRecipientOrApproved(streamId)) {
            revert Errors.SablierV2Lockup_Unauthorized(streamId, msg.sender);
        }

        // Retrieve the recipient from storage.
        address recipient = _ownerOf(streamId);

        // Checks: if `msg.sender` is the stream's sender, the withdrawal address must be the recipient.
        if (isCallerStreamSender && to != recipient) {
            revert Errors.SablierV2Lockup_InvalidSenderWithdrawal(streamId, msg.sender, to);
        }

        // Checks: the withdrawal address is not zero.
        if (to == address(0)) {
            revert Errors.SablierV2Lockup_WithdrawToZeroAddress();
        }

        // Checks: the withdraw amount is not zero.
        if (amount == 0) {
            revert Errors.SablierV2Lockup_WithdrawAmountZero(streamId);
        }

        // Checks: the withdraw amount is not greater than the withdrawable amount.
        uint128 withdrawableAmount = _withdrawableAmountOf(streamId);
        if (amount > withdrawableAmount) {
            revert Errors.SablierV2Lockup_Overdraw(streamId, amount, withdrawableAmount);
        }

        // Effects and Interactions: make the withdrawal.
        _withdraw(streamId, to, amount);

        // Interactions: if `msg.sender` is not the recipient and the recipient is a contract, try to invoke the
        // withdraw hook on it without reverting if the hook is not implemented, and also without bubbling up
        // any potential revert.
        if (msg.sender != recipient && recipient.code.length > 0) {
            try ISablierV2LockupRecipient(recipient).onStreamWithdrawn({
                streamId: streamId,
                caller: msg.sender,
                to: to,
                amount: amount
            }) { } catch { }
        }
    }

    /// @inheritdoc ISablierV2Lockup
    function withdrawMax(uint256 streamId, address to) external override {
        withdraw({ streamId: streamId, to: to, amount: _withdrawableAmountOf(streamId) });
    }

    /// @inheritdoc ISablierV2Lockup
    function withdrawMaxAndTransfer(
        uint256 streamId,
        address newRecipient
    )
        external
        override
        noDelegateCall
        notNull(streamId)
    {
        // Checks: the caller is the current recipient. This also checks that the NFT was not burned.
        address currentRecipient = _ownerOf(streamId);
        if (msg.sender != currentRecipient) {
            revert Errors.SablierV2Lockup_Unauthorized(streamId, msg.sender);
        }

        // Skip the withdrawal if the withdrawable amount is zero.
        uint128 withdrawableAmount = _withdrawableAmountOf(streamId);
        if (withdrawableAmount > 0) {
            withdraw({ streamId: streamId, to: currentRecipient, amount: withdrawableAmount });
        }

        // Checks and Effects: transfer the NFT.
        _transfer({ from: currentRecipient, to: newRecipient, tokenId: streamId });
    }

    /// @inheritdoc ISablierV2Lockup
    function withdrawMultiple(
        uint256[] calldata streamIds,
        address to,
        uint128[] calldata amounts
    )
        external
        override
        noDelegateCall
    {
        // Checks: there is an equal number of `streamIds` and `amounts`.
        uint256 streamIdsCount = streamIds.length;
        uint256 amountsCount = amounts.length;
        if (streamIdsCount != amountsCount) {
            revert Errors.SablierV2Lockup_WithdrawArrayCountsNotEqual(streamIdsCount, amountsCount);
        }

        // Iterate over the provided array of stream ids and withdraw from each stream.
        for (uint256 i = 0; i < streamIdsCount;) {
            // Checks, Effects and Interactions: check the parameters and make the withdrawal.
            withdraw(streamIds[i], to, amounts[i]);

            // Increment the loop iterator.
            unchecked {
                i += 1;
            }
        }
    }

    /*//////////////////////////////////////////////////////////////////////////
                             INTERNAL CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Overrides the internal ERC-721 transfer function to emit an ERC-4906 event upon transfer. The goal is to
    /// refresh the NFT metadata on external platforms.
    /// @dev This event is also emitted when the NFT is minted or burned.
    function _afterTokenTransfer(
        address, /* from */
        address, /* to */
        uint256 streamId,
        uint256 /* batchSize */
    )
        internal
        override
        updateMetadata(streamId)
    { }

    /// @notice Overrides the internal ERC-721 transfer function to check that the stream is transferable.
    /// @dev There are two cases when the transferable flag is ignored:
    /// - If `from` is 0, then the transfer is a mint and is allowed.
    /// - If `to` is 0, then the transfer is a burn and is also allowed.
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 streamId,
        uint256 /* batchSize */
    )
        internal
        view
        override
    {
        if (!isTransferable(streamId) && to != address(0) && from != address(0)) {
            revert Errors.SablierV2Lockup_NotTransferable(streamId);
        }
    }

    /// @notice Checks whether `msg.sender` is the stream's recipient or an approved third party.
    /// @param streamId The stream id for the query.
    function _isCallerStreamRecipientOrApproved(uint256 streamId) internal view returns (bool) {
        address recipient = _ownerOf(streamId);
        return msg.sender == recipient || isApprovedForAll({ owner: recipient, operator: msg.sender })
            || getApproved(streamId) == msg.sender;
    }

    /// @notice Checks whether `msg.sender` is the stream's sender.
    /// @param streamId The stream id for the query.
    function _isCallerStreamSender(uint256 streamId) internal view virtual returns (bool);

    /// @dev Retrieves the stream's status without performing a null check.
    function _statusOf(uint256 streamId) internal view virtual returns (Lockup.Status);

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _withdrawableAmountOf(uint256 streamId) internal view virtual returns (uint128);

    /*//////////////////////////////////////////////////////////////////////////
                           INTERNAL NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _cancel(uint256 tokenId) internal virtual;

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _renounce(uint256 streamId) internal virtual;

    /// @dev See the documentation for the user-facing functions that call this internal function.
    function _withdraw(uint256 streamId, address to, uint128 amount) internal virtual;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { UD60x18 } from "@prb/math/src/UD60x18.sol";

import { IAdminable } from "./IAdminable.sol";

/// @title ISablierV2Controller
/// @notice This contract is in charge of the Sablier V2 protocol configuration, handling such values as the
/// protocol fees.
interface ISablierV2Comptroller is IAdminable {
    /*//////////////////////////////////////////////////////////////////////////
                                       EVENTS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Emitted when the admin sets a new flash fee.
    /// @param admin The address of the contract admin.
    /// @param oldFlashFee The old flash fee, denoted as a fixed-point number.
    /// @param newFlashFee The new flash fee, denoted as a fixed-point number.
    event SetFlashFee(address indexed admin, UD60x18 oldFlashFee, UD60x18 newFlashFee);

    /// @notice Emitted when the admin sets a new protocol fee for the provided ERC-20 asset.
    /// @param admin The address of the contract admin.
    /// @param asset The contract address of the ERC-20 asset the new protocol fee has been set for.
    /// @param oldProtocolFee The old protocol fee, denoted as a fixed-point number.
    /// @param newProtocolFee The new protocol fee, denoted as a fixed-point number.
    event SetProtocolFee(address indexed admin, IERC20 indexed asset, UD60x18 oldProtocolFee, UD60x18 newProtocolFee);

    /// @notice Emitted when the admin enables or disables an ERC-20 asset for flash loaning.
    /// @param admin The address of the contract admin.
    /// @param asset The contract address of the ERC-20 asset to toggle.
    /// @param newFlag Whether the ERC-20 asset can be flash loaned.
    event ToggleFlashAsset(address indexed admin, IERC20 indexed asset, bool newFlag);

    /*//////////////////////////////////////////////////////////////////////////
                                 CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Retrieves the global flash fee, denoted as a fixed-point number where 1e18 is 100%.
    ///
    /// @dev Notes:
    /// - This fee represents a percentage, not an amount. Do not confuse it with {IERC3156FlashLender.flashFee},
    /// which calculates the fee amount for a specified flash loan amount.
    /// - Unlike the protocol fee, this is a global fee applied to all flash loans, not a per-asset fee.
    function flashFee() external view returns (UD60x18 fee);

    /// @notice Retrieves a flag indicating whether the provided ERC-20 asset can be flash loaned.
    /// @param token The contract address of the ERC-20 asset to check.
    function isFlashAsset(IERC20 token) external view returns (bool result);

    /// @notice Retrieves the protocol fee for all streams created with the provided ERC-20 asset.
    /// @param asset The contract address of the ERC-20 asset to query.
    /// @return fee The protocol fee denoted as a fixed-point number where 1e18 is 100%.
    function protocolFees(IERC20 asset) external view returns (UD60x18 fee);

    /*//////////////////////////////////////////////////////////////////////////
                               NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Updates the flash fee charged on all flash loans made with any ERC-20 asset.
    ///
    /// @dev Emits a {SetFlashFee} event.
    ///
    /// Notes:
    /// - Does not revert if the fee is the same.
    ///
    /// Requirements:
    /// - `msg.sender` must be the contract admin.
    ///
    /// @param newFlashFee The new flash fee to set, denoted as a fixed-point number where 1e18 is 100%.
    function setFlashFee(UD60x18 newFlashFee) external;

    /// @notice Sets a new protocol fee that will be charged on all streams created with the provided ERC-20 asset.
    ///
    /// @dev Emits a {SetProtocolFee} event.
    ///
    /// Notes:
    /// - The fee is not denoted in units of the asset's decimals; it is a fixed-point number. Refer to the
    /// PRBMath documentation for more detail on the logic of UD60x18.
    /// - Does not revert if the fee is the same.
    ///
    /// Requirements:
    /// - `msg.sender` must be the contract admin.
    ///
    /// @param asset The contract address of the ERC-20 asset to update the fee for.
    /// @param newProtocolFee The new protocol fee, denoted as a fixed-point number where 1e18 is 100%.
    function setProtocolFee(IERC20 asset, UD60x18 newProtocolFee) external;

    /// @notice Toggles the flash loanability of an ERC-20 asset.
    ///
    /// @dev Emits a {ToggleFlashAsset} event.
    ///
    /// Requirements:
    /// - `msg.sender` must be the admin.
    ///
    /// @param asset The address of the ERC-20 asset to toggle.
    function toggleFlashAsset(IERC20 asset) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC721Metadata } from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";

import { Lockup } from "../types/DataTypes.sol";
import { ISablierV2Base } from "./ISablierV2Base.sol";
import { ISablierV2NFTDescriptor } from "./ISablierV2NFTDescriptor.sol";

/// @title ISablierV2Lockup
/// @notice Common logic between all Sablier V2 Lockup streaming contracts.
interface ISablierV2Lockup is
    ISablierV2Base, // 1 inherited component
    IERC721Metadata // 2 inherited components
{
    /*//////////////////////////////////////////////////////////////////////////
                                       EVENTS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Emitted when a stream is canceled.
    /// @param streamId The id of the stream.
    /// @param sender The address of the stream's sender.
    /// @param recipient The address of the stream's recipient.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param senderAmount The amount of assets refunded to the stream's sender, denoted in units of the asset's
    /// decimals.
    /// @param recipientAmount The amount of assets left for the stream's recipient to withdraw, denoted in units of the
    /// asset's decimals.
    event CancelLockupStream(
        uint256 streamId,
        address indexed sender,
        address indexed recipient,
        IERC20 indexed asset,
        uint128 senderAmount,
        uint128 recipientAmount
    );

    /// @notice Emitted when a sender gives up the right to cancel a stream.
    /// @param streamId The id of the stream.
    event RenounceLockupStream(uint256 indexed streamId);

    /// @notice Emitted when the admin sets a new NFT descriptor contract.
    /// @param admin The address of the current contract admin.
    /// @param oldNFTDescriptor The address of the old NFT descriptor contract.
    /// @param newNFTDescriptor The address of the new NFT descriptor contract.
    event SetNFTDescriptor(
        address indexed admin, ISablierV2NFTDescriptor oldNFTDescriptor, ISablierV2NFTDescriptor newNFTDescriptor
    );

    /// @notice Emitted when assets are withdrawn from a stream.
    /// @param streamId The id of the stream.
    /// @param to The address that has received the withdrawn assets.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param amount The amount of assets withdrawn, denoted in units of the asset's decimals.
    event WithdrawFromLockupStream(uint256 indexed streamId, address indexed to, IERC20 indexed asset, uint128 amount);

    /*//////////////////////////////////////////////////////////////////////////
                                 CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Retrieves the address of the ERC-20 asset used for streaming.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getAsset(uint256 streamId) external view returns (IERC20 asset);

    /// @notice Retrieves the amount deposited in the stream, denoted in units of the asset's decimals.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getDepositedAmount(uint256 streamId) external view returns (uint128 depositedAmount);

    /// @notice Retrieves the stream's end time, which is a Unix timestamp.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getEndTime(uint256 streamId) external view returns (uint40 endTime);

    /// @notice Retrieves the stream's recipient.
    /// @dev Reverts if the NFT has been burned.
    /// @param streamId The stream id for the query.
    function getRecipient(uint256 streamId) external view returns (address recipient);

    /// @notice Retrieves the amount refunded to the sender after a cancellation, denoted in units of the asset's
    /// decimals. This amount is always zero unless the stream was canceled.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getRefundedAmount(uint256 streamId) external view returns (uint128 refundedAmount);

    /// @notice Retrieves the stream's sender.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getSender(uint256 streamId) external view returns (address sender);

    /// @notice Retrieves the stream's start time, which is a Unix timestamp.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getStartTime(uint256 streamId) external view returns (uint40 startTime);

    /// @notice Retrieves the amount withdrawn from the stream, denoted in units of the asset's decimals.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getWithdrawnAmount(uint256 streamId) external view returns (uint128 withdrawnAmount);

    /// @notice Retrieves a flag indicating whether the stream can be canceled. When the stream is cold, this
    /// flag is always `false`.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function isCancelable(uint256 streamId) external view returns (bool result);

    /// @notice Retrieves a flag indicating whether the stream is cold, i.e. settled, canceled, or depleted.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function isCold(uint256 streamId) external view returns (bool result);

    /// @notice Retrieves a flag indicating whether the stream is depleted.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function isDepleted(uint256 streamId) external view returns (bool result);

    /// @notice Retrieves a flag indicating whether the stream exists.
    /// @dev Does not revert if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function isStream(uint256 streamId) external view returns (bool result);

    /// @notice Retrieves a flag indicating whether the stream NFT can be transferred.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function isTransferable(uint256 streamId) external view returns (bool result);

    /// @notice Retrieves a flag indicating whether the stream is warm, i.e. either pending or streaming.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function isWarm(uint256 streamId) external view returns (bool result);

    /// @notice Counter for stream ids, used in the create functions.
    function nextStreamId() external view returns (uint256);

    /// @notice Calculates the amount that the sender would be refunded if the stream were canceled, denoted in units
    /// of the asset's decimals.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function refundableAmountOf(uint256 streamId) external view returns (uint128 refundableAmount);

    /// @notice Retrieves the stream's status.
    /// @param streamId The stream id for the query.
    function statusOf(uint256 streamId) external view returns (Lockup.Status status);

    /// @notice Calculates the amount streamed to the recipient, denoted in units of the asset's decimals.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function streamedAmountOf(uint256 streamId) external view returns (uint128 streamedAmount);

    /// @notice Retrieves a flag indicating whether the stream was canceled.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function wasCanceled(uint256 streamId) external view returns (bool result);

    /// @notice Calculates the amount that the recipient can withdraw from the stream, denoted in units of the asset's
    /// decimals.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function withdrawableAmountOf(uint256 streamId) external view returns (uint128 withdrawableAmount);

    /*//////////////////////////////////////////////////////////////////////////
                               NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Burns the NFT associated with the stream.
    ///
    /// @dev Emits a {Transfer} event.
    ///
    /// Requirements:
    /// - Must not be delegate called.
    /// - `streamId` must reference a depleted stream.
    /// - The NFT must exist.
    /// - `msg.sender` must be either the NFT owner or an approved third party.
    ///
    /// @param streamId The id of the stream NFT to burn.
    function burn(uint256 streamId) external;

    /// @notice Cancels the stream and refunds any remaining assets to the sender.
    ///
    /// @dev Emits a {Transfer}, {CancelLockupStream}, and {MetadataUpdate} event.
    ///
    /// Notes:
    /// - If there any assets left for the recipient to withdraw, the stream is marked as canceled. Otherwise, the
    /// stream is marked as depleted.
    /// - This function attempts to invoke a hook on the recipient, if the resolved address is a contract.
    ///
    /// Requirements:
    /// - Must not be delegate called.
    /// - The stream must be warm and cancelable.
    /// - `msg.sender` must be the stream's sender.
    ///
    /// @param streamId The id of the stream to cancel.
    function cancel(uint256 streamId) external;

    /// @notice Cancels multiple streams and refunds any remaining assets to the sender.
    ///
    /// @dev Emits multiple {Transfer}, {CancelLockupStream}, and {MetadataUpdate} events.
    ///
    /// Notes:
    /// - Refer to the notes in {cancel}.
    ///
    /// Requirements:
    /// - All requirements from {cancel} must be met for each stream.
    ///
    /// @param streamIds The ids of the streams to cancel.
    function cancelMultiple(uint256[] calldata streamIds) external;

    /// @notice Removes the right of the stream's sender to cancel the stream.
    ///
    /// @dev Emits a {RenounceLockupStream} and {MetadataUpdate} event.
    ///
    /// Notes:
    /// - This is an irreversible operation.
    /// - This function attempts to invoke a hook on the stream's recipient, provided that the recipient is a contract.
    ///
    /// Requirements:
    /// - Must not be delegate called.
    /// - `streamId` must reference a warm stream.
    /// - `msg.sender` must be the stream's sender.
    /// - The stream must be cancelable.
    ///
    /// @param streamId The id of the stream to renounce.
    function renounce(uint256 streamId) external;

    /// @notice Sets a new NFT descriptor contract, which produces the URI describing the Sablier stream NFTs.
    ///
    /// @dev Emits a {SetNFTDescriptor} and {BatchMetadataUpdate} event.
    ///
    /// Notes:
    /// - Does not revert if the NFT descriptor is the same.
    ///
    /// Requirements:
    /// - `msg.sender` must be the contract admin.
    ///
    /// @param newNFTDescriptor The address of the new NFT descriptor contract.
    function setNFTDescriptor(ISablierV2NFTDescriptor newNFTDescriptor) external;

    /// @notice Withdraws the provided amount of assets from the stream to the `to` address.
    ///
    /// @dev Emits a {Transfer}, {WithdrawFromLockupStream}, and {MetadataUpdate} event.
    ///
    /// Notes:
    /// - This function attempts to invoke a hook on the stream's recipient, provided that the recipient is a contract
    /// and `msg.sender` is either the sender or an approved operator.
    ///
    /// Requirements:
    /// - Must not be delegate called.
    /// - `streamId` must not reference a null or depleted stream.
    /// - `msg.sender` must be the stream's sender, the stream's recipient or an approved third party.
    /// - `to` must be the recipient if `msg.sender` is the stream's sender.
    /// - `to` must not be the zero address.
    /// - `amount` must be greater than zero and must not exceed the withdrawable amount.
    ///
    /// @param streamId The id of the stream to withdraw from.
    /// @param to The address receiving the withdrawn assets.
    /// @param amount The amount to withdraw, denoted in units of the asset's decimals.
    function withdraw(uint256 streamId, address to, uint128 amount) external;

    /// @notice Withdraws the maximum withdrawable amount from the stream to the provided address `to`.
    ///
    /// @dev Emits a {Transfer}, {WithdrawFromLockupStream}, and {MetadataUpdate} event.
    ///
    /// Notes:
    /// - Refer to the notes in {withdraw}.
    ///
    /// Requirements:
    /// - Refer to the requirements in {withdraw}.
    ///
    /// @param streamId The id of the stream to withdraw from.
    /// @param to The address receiving the withdrawn assets.
    function withdrawMax(uint256 streamId, address to) external;

    /// @notice Withdraws the maximum withdrawable amount from the stream to the current recipient, and transfers the
    /// NFT to `newRecipient`.
    ///
    /// @dev Emits a {WithdrawFromLockupStream} and a {Transfer} event.
    ///
    /// Notes:
    /// - If the withdrawable amount is zero, the withdrawal is skipped.
    /// - Refer to the notes in {withdraw}.
    ///
    /// Requirements:
    /// - `msg.sender` must be the stream's recipient.
    /// - Refer to the requirements in {withdraw}.
    /// - Refer to the requirements in {IERC721.transferFrom}.
    ///
    /// @param streamId The id of the stream NFT to transfer.
    /// @param newRecipient The address of the new owner of the stream NFT.
    function withdrawMaxAndTransfer(uint256 streamId, address newRecipient) external;

    /// @notice Withdraws assets from streams to the provided address `to`.
    ///
    /// @dev Emits multiple {Transfer}, {WithdrawFromLockupStream}, and {MetadataUpdate} events.
    ///
    /// Notes:
    /// - This function attempts to call a hook on the recipient of each stream, unless `msg.sender` is the recipient.
    ///
    /// Requirements:
    /// - All requirements from {withdraw} must be met for each stream.
    /// - There must be an equal number of `streamIds` and `amounts`.
    ///
    /// @param streamIds The ids of the streams to withdraw from.
    /// @param to The address receiving the withdrawn assets.
    /// @param amounts The amounts to withdraw, denoted in units of the asset's decimals.
    function withdrawMultiple(uint256[] calldata streamIds, address to, uint128[] calldata amounts) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import { Lockup, LockupLinear } from "../types/DataTypes.sol";
import { ISablierV2Lockup } from "./ISablierV2Lockup.sol";

/// @title ISablierV2LockupLinear
/// @notice Creates and manages Lockup streams with linear streaming functions.
interface ISablierV2LockupLinear is ISablierV2Lockup {
    /*//////////////////////////////////////////////////////////////////////////
                                       EVENTS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Emitted when a stream is created.
    /// @param streamId The id of the newly created stream.
    /// @param funder The address which funded the stream.
    /// @param sender The address streaming the assets, with the ability to cancel the stream.
    /// @param recipient The address receiving the assets.
    /// @param amounts Struct containing (i) the deposit amount, (ii) the protocol fee amount, and (iii) the
    /// broker fee amount, all denoted in units of the asset's decimals.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param cancelable Boolean indicating whether the stream will be cancelable or not.
    /// @param transferable Boolean indicating whether the stream NFT is transferable or not.
    /// @param range Struct containing (i) the stream's start time, (ii) cliff time, and (iii) end time, all as Unix
    /// timestamps.
    /// @param broker The address of the broker who has helped create the stream, e.g. a front-end website.
    event CreateLockupLinearStream(
        uint256 streamId,
        address funder,
        address indexed sender,
        address indexed recipient,
        Lockup.CreateAmounts amounts,
        IERC20 indexed asset,
        bool cancelable,
        bool transferable,
        LockupLinear.Range range,
        address broker
    );

    /*//////////////////////////////////////////////////////////////////////////
                                 CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Retrieves the stream's cliff time, which is a Unix timestamp.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getCliffTime(uint256 streamId) external view returns (uint40 cliffTime);

    /// @notice Retrieves the stream's range, which is a struct containing (i) the stream's start time, (ii) cliff
    /// time, and (iii) end time, all as Unix timestamps.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getRange(uint256 streamId) external view returns (LockupLinear.Range memory range);

    /// @notice Retrieves the stream entity.
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function getStream(uint256 streamId) external view returns (LockupLinear.Stream memory stream);

    /// @notice Calculates the amount streamed to the recipient, denoted in units of the asset's decimals.
    ///
    /// When the stream is warm, the streaming function is:
    ///
    /// $$
    /// f(x) = x * d + c
    /// $$
    ///
    /// Where:
    ///
    /// - $x$ is the elapsed time divided by the stream's total duration.
    /// - $d$ is the deposited amount.
    /// - $c$ is the cliff amount.
    ///
    /// Upon cancellation of the stream, the amount streamed is calculated as the difference between the deposited
    /// amount and the refunded amount. Ultimately, when the stream becomes depleted, the streamed amount is equivalent
    /// to the total amount withdrawn.
    ///
    /// @dev Reverts if `streamId` references a null stream.
    /// @param streamId The stream id for the query.
    function streamedAmountOf(uint256 streamId) external view returns (uint128 streamedAmount);

    /*//////////////////////////////////////////////////////////////////////////
                               NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Creates a stream by setting the start time to `block.timestamp`, and the end time to
    /// the sum of `block.timestamp` and `params.durations.total`. The stream is funded by `msg.sender` and is wrapped
    /// in an ERC-721 NFT.
    ///
    /// @dev Emits a {Transfer} and {CreateLockupLinearStream} event.
    ///
    /// Requirements:
    /// - All requirements in {createWithRange} must be met for the calculated parameters.
    ///
    /// @param params Struct encapsulating the function parameters, which are documented in {DataTypes}.
    /// @return streamId The id of the newly created stream.
    function createWithDurations(LockupLinear.CreateWithDurations calldata params)
        external
        returns (uint256 streamId);

    /// @notice Creates a stream with the provided start time and end time as the range. The stream is
    /// funded by `msg.sender` and is wrapped in an ERC-721 NFT.
    ///
    /// @dev Emits a {Transfer} and {CreateLockupLinearStream} event.
    ///
    /// Notes:
    /// - As long as the times are ordered, it is not an error for the start or the cliff time to be in the past.
    ///
    /// Requirements:
    /// - Must not be delegate called.
    /// - `params.totalAmount` must be greater than zero.
    /// - If set, `params.broker.fee` must not be greater than `MAX_FEE`.
    /// - `params.range.start` must be less than or equal to `params.range.cliff`.
    /// - `params.range.cliff` must be less than `params.range.end`.
    /// - `params.range.end` must be in the future.
    /// - `params.recipient` must not be the zero address.
    /// - `msg.sender` must have allowed this contract to spend at least `params.totalAmount` assets.
    ///
    /// @param params Struct encapsulating the function parameters, which are documented in {DataTypes}.
    /// @return streamId The id of the newly created stream.
    function createWithRange(LockupLinear.CreateWithRange calldata params) external returns (uint256 streamId);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IERC721Metadata } from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";

/// @title ISablierV2NFTDescriptor
/// @notice This contract generates the URI describing the Sablier V2 stream NFTs.
/// @dev Inspired by Uniswap V3 Positions NFTs.
interface ISablierV2NFTDescriptor {
    /// @notice Produces the URI describing a particular stream NFT.
    /// @dev This is a data URI with the JSON contents directly inlined.
    /// @param sablier The address of the Sablier contract the stream was created in.
    /// @param streamId The id of the stream for which to produce a description.
    /// @return uri The URI of the ERC721-compliant metadata.
    function tokenURI(IERC721Metadata sablier, uint256 streamId) external view returns (string memory uri);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

/// @title ISablierV2LockupRecipient
/// @notice Interface for recipient contracts capable of reacting to cancellations, renouncements, and withdrawals.
/// @dev Implementation of this interface is optional. If a recipient contract doesn't implement this
/// interface or implements it partially, function execution will not revert.
interface ISablierV2LockupRecipient {
    /// @notice Responds to sender-triggered cancellations.
    ///
    /// @dev Notes:
    /// - This function may revert, but the Sablier contract will ignore the revert.
    ///
    /// @param streamId The id of the canceled stream.
    /// @param sender The stream's sender, who canceled the stream.
    /// @param senderAmount The amount of assets refunded to the stream's sender, denoted in units of the asset's
    /// decimals.
    /// @param recipientAmount The amount of assets left for the stream's recipient to withdraw, denoted in units of
    /// the asset's decimals.
    function onStreamCanceled(
        uint256 streamId,
        address sender,
        uint128 senderAmount,
        uint128 recipientAmount
    )
        external;

    /// @notice Responds to renouncements.
    ///
    /// @dev Notes:
    /// - This function may revert, but the Sablier contract will ignore the revert.
    ///
    /// @param streamId The id of the renounced stream.
    function onStreamRenounced(uint256 streamId) external;

    /// @notice Responds to withdrawals triggered by either the stream's sender or an approved third party.
    ///
    /// @dev Notes:
    /// - This function may revert, but the Sablier contract will ignore the revert.
    ///
    /// @param streamId The id of the stream being withdrawn from.
    /// @param caller The original `msg.sender` address that triggered the withdrawal.
    /// @param to The address receiving the withdrawn assets.
    /// @param amount The amount of assets withdrawn, denoted in units of the asset's decimals.
    function onStreamWithdrawn(uint256 streamId, address caller, address to, uint128 amount) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC721Metadata } from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import { UD60x18 } from "@prb/math/src/UD60x18.sol";

/// @title Errors
/// @notice Library containing all custom errors the protocol may revert with.
library Errors {
    /*//////////////////////////////////////////////////////////////////////////
                                      GENERICS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when `msg.sender` is not the admin.
    error CallerNotAdmin(address admin, address caller);

    /// @notice Thrown when trying to delegate call to a function that disallows delegate calls.
    error DelegateCall();

    /*//////////////////////////////////////////////////////////////////////////
                                  SABLIER-V2-BASE
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when trying to claim protocol revenues for an asset with no accrued revenues.
    error SablierV2Base_NoProtocolRevenues(IERC20 asset);

    /*//////////////////////////////////////////////////////////////////////////
                               SABLIER-V2-FLASH-LOAN
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when trying to flash loan an unsupported asset.
    error SablierV2FlashLoan_AssetNotFlashLoanable(IERC20 asset);

    /// @notice Thrown when trying to flash loan an amount greater than or equal to 2^128.
    error SablierV2FlashLoan_AmountTooHigh(uint256 amount);

    /// @notice Thrown when the calculated fee during a flash loan is greater than or equal to 2^128.
    error SablierV2FlashLoan_CalculatedFeeTooHigh(uint256 amount);

    /// @notice Thrown when the callback to the flash borrower fails.
    error SablierV2FlashLoan_FlashBorrowFail();

    /*//////////////////////////////////////////////////////////////////////////
                                 SABLIER-V2-LOCKUP
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when the broker fee exceeds the maximum allowed fee.
    error SablierV2Lockup_BrokerFeeTooHigh(UD60x18 brokerFee, UD60x18 maxFee);

    /// @notice Thrown when trying to create a stream with a zero deposit amount.
    error SablierV2Lockup_DepositAmountZero();

    /// @notice Thrown when trying to create a stream with an end time not in the future.
    error SablierV2Lockup_EndTimeNotInTheFuture(uint40 currentTime, uint40 endTime);

    /// @notice Thrown when the stream's sender tries to withdraw to an address other than the recipient's.
    error SablierV2Lockup_InvalidSenderWithdrawal(uint256 streamId, address sender, address to);

    /// @notice Thrown when trying to transfer Stream NFT when transferability is disabled.
    error SablierV2Lockup_NotTransferable(uint256 tokenId);

    /// @notice Thrown when the id references a null stream.
    error SablierV2Lockup_Null(uint256 streamId);

    /// @notice Thrown when trying to withdraw an amount greater than the withdrawable amount.
    error SablierV2Lockup_Overdraw(uint256 streamId, uint128 amount, uint128 withdrawableAmount);

    /// @notice Thrown when the protocol fee exceeds the maximum allowed fee.
    error SablierV2Lockup_ProtocolFeeTooHigh(UD60x18 protocolFee, UD60x18 maxFee);

    /// @notice Thrown when trying to cancel or renounce a canceled stream.
    error SablierV2Lockup_StreamCanceled(uint256 streamId);

    /// @notice Thrown when trying to cancel, renounce, or withdraw from a depleted stream.
    error SablierV2Lockup_StreamDepleted(uint256 streamId);

    /// @notice Thrown when trying to cancel or renounce a stream that is not cancelable.
    error SablierV2Lockup_StreamNotCancelable(uint256 streamId);

    /// @notice Thrown when trying to burn a stream that is not depleted.
    error SablierV2Lockup_StreamNotDepleted(uint256 streamId);

    /// @notice Thrown when trying to cancel or renounce a settled stream.
    error SablierV2Lockup_StreamSettled(uint256 streamId);

    /// @notice Thrown when `msg.sender` lacks authorization to perform an action.
    error SablierV2Lockup_Unauthorized(uint256 streamId, address caller);

    /// @notice Thrown when trying to withdraw zero assets from a stream.
    error SablierV2Lockup_WithdrawAmountZero(uint256 streamId);

    /// @notice Thrown when trying to withdraw from multiple streams and the number of stream ids does
    /// not match the number of withdraw amounts.
    error SablierV2Lockup_WithdrawArrayCountsNotEqual(uint256 streamIdsCount, uint256 amountsCount);

    /// @notice Thrown when trying to withdraw to the zero address.
    error SablierV2Lockup_WithdrawToZeroAddress();

    /*//////////////////////////////////////////////////////////////////////////
                             SABLIER-V2-LOCKUP-DYNAMIC
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when trying to create a stream with a deposit amount not equal to the sum of the
    /// segment amounts.
    error SablierV2LockupDynamic_DepositAmountNotEqualToSegmentAmountsSum(
        uint128 depositAmount, uint128 segmentAmountsSum
    );

    /// @notice Thrown when trying to create a stream with more segments than the maximum allowed.
    error SablierV2LockupDynamic_SegmentCountTooHigh(uint256 count);

    /// @notice Thrown when trying to create a stream with no segments.
    error SablierV2LockupDynamic_SegmentCountZero();

    /// @notice Thrown when trying to create a stream with unordered segment milestones.
    error SablierV2LockupDynamic_SegmentMilestonesNotOrdered(
        uint256 index, uint40 previousMilestone, uint40 currentMilestone
    );

    /// @notice Thrown when trying to create a stream with a start time not strictly less than the first
    /// segment milestone.
    error SablierV2LockupDynamic_StartTimeNotLessThanFirstSegmentMilestone(
        uint40 startTime, uint40 firstSegmentMilestone
    );

    /*//////////////////////////////////////////////////////////////////////////
                              SABLIER-V2-LOCKUP-LINEAR
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when trying to create a stream with a cliff time not strictly less than the end time.
    error SablierV2LockupLinear_CliffTimeNotLessThanEndTime(uint40 cliffTime, uint40 endTime);

    /// @notice Thrown when trying to create a stream with a start time greater than the cliff time.
    error SablierV2LockupLinear_StartTimeGreaterThanCliffTime(uint40 startTime, uint40 cliffTime);

    /*//////////////////////////////////////////////////////////////////////////
                             SABLIER-V2-NFT-DESCRIPTOR
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when trying to generate the token URI for an unknown ERC-721 NFT contract.
    error SablierV2NFTDescriptor_UnknownNFT(IERC721Metadata nft, string symbol);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.19;

import { UD60x18, ud } from "@prb/math/src/UD60x18.sol";

import { Lockup, LockupDynamic, LockupLinear } from "../types/DataTypes.sol";
import { Errors } from "./Errors.sol";

/// @title Helpers
/// @notice Library with helper functions needed across the Sablier V2 contracts.
library Helpers {
    /*//////////////////////////////////////////////////////////////////////////
                             INTERNAL CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Checks that neither fee is greater than `maxFee`, and then calculates the protocol fee amount, the
    /// broker fee amount, and the deposit amount from the total amount.
    function checkAndCalculateFees(
        uint128 totalAmount,
        UD60x18 protocolFee,
        UD60x18 brokerFee,
        UD60x18 maxFee
    )
        internal
        pure
        returns (Lockup.CreateAmounts memory amounts)
    {
        // When the total amount is zero, the fees are also zero.
        if (totalAmount == 0) {
            return Lockup.CreateAmounts(0, 0, 0);
        }

        // Checks: the protocol fee is not greater than `maxFee`.
        if (protocolFee.gt(maxFee)) {
            revert Errors.SablierV2Lockup_ProtocolFeeTooHigh(protocolFee, maxFee);
        }
        // Checks: the broker fee is not greater than `maxFee`.
        if (brokerFee.gt(maxFee)) {
            revert Errors.SablierV2Lockup_BrokerFeeTooHigh(brokerFee, maxFee);
        }

        // Calculate the protocol fee amount.
        // The cast to uint128 is safe because the maximum fee is hard coded.
        amounts.protocolFee = uint128(ud(totalAmount).mul(protocolFee).intoUint256());

        // Calculate the broker fee amount.
        // The cast to uint128 is safe because the maximum fee is hard coded.
        amounts.brokerFee = uint128(ud(totalAmount).mul(brokerFee).intoUint256());

        // Assert that the total amount is strictly greater than the sum of the protocol fee amount and the
        // broker fee amount.
        assert(totalAmount > amounts.protocolFee + amounts.brokerFee);

        // Calculate the deposit amount (the amount to stream, net of fees).
        amounts.deposit = totalAmount - amounts.protocolFee - amounts.brokerFee;
    }

    /// @dev Checks the parameters of the {SablierV2LockupDynamic-_createWithMilestones} function.
    function checkCreateWithMilestones(
        uint128 depositAmount,
        LockupDynamic.Segment[] memory segments,
        uint256 maxSegmentCount,
        uint40 startTime
    )
        internal
        view
    {
        // Checks: the deposit amount is not zero.
        if (depositAmount == 0) {
            revert Errors.SablierV2Lockup_DepositAmountZero();
        }

        // Checks: the segment count is not zero.
        uint256 segmentCount = segments.length;
        if (segmentCount == 0) {
            revert Errors.SablierV2LockupDynamic_SegmentCountZero();
        }

        // Checks: the segment count is not greater than the maximum allowed.
        if (segmentCount > maxSegmentCount) {
            revert Errors.SablierV2LockupDynamic_SegmentCountTooHigh(segmentCount);
        }

        // Checks: requirements of segments variables.
        _checkSegments(segments, depositAmount, startTime);
    }

    /// @dev Checks the parameters of the {SablierV2LockupLinear-_createWithRange} function.
    function checkCreateWithRange(uint128 depositAmount, LockupLinear.Range memory range) internal view {
        // Checks: the deposit amount is not zero.
        if (depositAmount == 0) {
            revert Errors.SablierV2Lockup_DepositAmountZero();
        }

        // Checks: the start time is less than or equal to the cliff time.
        if (range.start > range.cliff) {
            revert Errors.SablierV2LockupLinear_StartTimeGreaterThanCliffTime(range.start, range.cliff);
        }

        // Checks: the cliff time is strictly less than the end time.
        if (range.cliff >= range.end) {
            revert Errors.SablierV2LockupLinear_CliffTimeNotLessThanEndTime(range.cliff, range.end);
        }

        // Checks: the end time is in the future.
        uint40 currentTime = uint40(block.timestamp);
        if (currentTime >= range.end) {
            revert Errors.SablierV2Lockup_EndTimeNotInTheFuture(currentTime, range.end);
        }
    }

    /// @dev Checks that the segment array counts match, and then adjusts the segments by calculating the milestones.
    function checkDeltasAndCalculateMilestones(LockupDynamic.SegmentWithDelta[] memory segments)
        internal
        view
        returns (LockupDynamic.Segment[] memory segmentsWithMilestones)
    {
        uint256 segmentCount = segments.length;
        segmentsWithMilestones = new LockupDynamic.Segment[](segmentCount);

        // Make the current time the stream's start time.
        uint40 startTime = uint40(block.timestamp);

        // It is safe to use unchecked arithmetic because {_createWithMilestone} will nonetheless check the soundness
        // of the calculated segment milestones.
        unchecked {
            // Precompute the first segment because of the need to add the start time to the first segment delta.
            segmentsWithMilestones[0] = LockupDynamic.Segment({
                amount: segments[0].amount,
                exponent: segments[0].exponent,
                milestone: startTime + segments[0].delta
            });

            // Copy the segment amounts and exponents, and calculate the segment milestones.
            for (uint256 i = 1; i < segmentCount; ++i) {
                segmentsWithMilestones[i] = LockupDynamic.Segment({
                    amount: segments[i].amount,
                    exponent: segments[i].exponent,
                    milestone: segmentsWithMilestones[i - 1].milestone + segments[i].delta
                });
            }
        }
    }

    /*//////////////////////////////////////////////////////////////////////////
                             PRIVATE CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Checks that:
    ///
    /// 1. The first milestone is strictly greater than the start time.
    /// 2. The milestones are ordered chronologically.
    /// 3. There are no duplicate milestones.
    /// 4. The deposit amount is equal to the sum of all segment amounts.
    function _checkSegments(
        LockupDynamic.Segment[] memory segments,
        uint128 depositAmount,
        uint40 startTime
    )
        private
        view
    {
        // Checks: the start time is strictly less than the first segment milestone.
        if (startTime >= segments[0].milestone) {
            revert Errors.SablierV2LockupDynamic_StartTimeNotLessThanFirstSegmentMilestone(
                startTime, segments[0].milestone
            );
        }

        // Pre-declare the variables needed in the for loop.
        uint128 segmentAmountsSum;
        uint40 currentMilestone;
        uint40 previousMilestone;

        // Iterate over the segments to:
        //
        // 1. Calculate the sum of all segment amounts.
        // 2. Check that the milestones are ordered.
        uint256 count = segments.length;
        for (uint256 index = 0; index < count;) {
            // Add the current segment amount to the sum.
            segmentAmountsSum += segments[index].amount;

            // Checks: the current milestone is strictly greater than the previous milestone.
            currentMilestone = segments[index].milestone;
            if (currentMilestone <= previousMilestone) {
                revert Errors.SablierV2LockupDynamic_SegmentMilestonesNotOrdered(
                    index, previousMilestone, currentMilestone
                );
            }

            // Make the current milestone the previous milestone of the next loop iteration.
            previousMilestone = currentMilestone;

            // Increment the loop iterator.
            unchecked {
                index += 1;
            }
        }

        // Checks: the last milestone is in the future.
        // When the loop exits, the current milestone is the last milestone, i.e. the stream's end time.
        uint40 currentTime = uint40(block.timestamp);
        if (currentTime >= currentMilestone) {
            revert Errors.SablierV2Lockup_EndTimeNotInTheFuture(currentTime, currentMilestone);
        }

        // Checks: the deposit amount is equal to the segment amounts sum.
        if (depositAmount != segmentAmountsSum) {
            revert Errors.SablierV2LockupDynamic_DepositAmountNotEqualToSegmentAmountsSum(
                depositAmount, segmentAmountsSum
            );
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { UD2x18 } from "@prb/math/src/UD2x18.sol";
import { UD60x18 } from "@prb/math/src/UD60x18.sol";

// DataTypes.sol
//
// This file defines all structs used in V2 Core, most of which are organized under three namespaces:
//
// - Lockup
// - LockupDynamic
// - LockupLinear
//
// You will notice that some structs contain "slot" annotations - they are used to indicate the
// storage layout of the struct. It is more gas efficient to group small data types together so
// that they fit in a single 32-byte slot.

/// @notice Struct encapsulating the broker parameters passed to the create functions. Both can be set to zero.
/// @param account The address receiving the broker's fee.
/// @param fee The broker's percentage fee from the total amount, denoted as a fixed-point number where 1e18 is 100%.
struct Broker {
    address account;
    UD60x18 fee;
}

/// @notice Namespace for the structs used in both {SablierV2LockupLinear} and {SablierV2LockupDynamic}.
library Lockup {
    /// @notice Struct encapsulating the deposit, withdrawn, and refunded amounts, all denoted in units
    /// of the asset's decimals.
    /// @dev Because the deposited and the withdrawn amount are often read together, declaring them in
    /// the same slot saves gas.
    /// @param deposited The initial amount deposited in the stream, net of fees.
    /// @param withdrawn The cumulative amount withdrawn from the stream.
    /// @param refunded The amount refunded to the sender. Unless the stream was canceled, this is always zero.
    struct Amounts {
        // slot 0
        uint128 deposited;
        uint128 withdrawn;
        // slot 1
        uint128 refunded;
    }

    /// @notice Struct encapsulating the deposit amount, the protocol fee amount, and the broker fee amount,
    /// all denoted in units of the asset's decimals.
    /// @param deposit The amount to deposit in the stream.
    /// @param protocolFee The protocol fee amount.
    /// @param brokerFee The broker fee amount.
    struct CreateAmounts {
        uint128 deposit;
        uint128 protocolFee;
        uint128 brokerFee;
    }

    /// @notice Enum representing the different statuses of a stream.
    /// @custom:value PENDING Stream created but not started; assets are in a pending state.
    /// @custom:value STREAMING Active stream where assets are currently being streamed.
    /// @custom:value SETTLED All assets have been streamed; recipient is due to withdraw them.
    /// @custom:value CANCELED Canceled stream; remaining assets await recipient's withdrawal.
    /// @custom:value DEPLETED Depleted stream; all assets have been withdrawn and/or refunded.
    enum Status {
        PENDING, // value 0
        STREAMING, // value 1
        SETTLED, // value 2
        CANCELED, // value 3
        DEPLETED // value 4
    }
}

/// @notice Namespace for the structs used in {SablierV2LockupDynamic}.
library LockupDynamic {
    /// @notice Struct encapsulating the parameters for the {SablierV2LockupDynamic.createWithDeltas} function.
    /// @param sender The address streaming the assets, with the ability to cancel the stream. It doesn't have to be the
    /// same as `msg.sender`.
    /// @param recipient The address receiving the assets.
    /// @param totalAmount The total amount of ERC-20 assets to be paid, including the stream deposit and any potential
    /// fees, all denoted in units of the asset's decimals.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param cancelable Indicates if the stream is cancelable.
    /// @param transferable Indicates if the stream NFT is transferable.
    /// @param broker Struct containing (i) the address of the broker assisting in creating the stream, and (ii) the
    /// percentage fee paid to the broker from `totalAmount`, denoted as a fixed-point number. Both can be set to zero.
    /// @param segments Segments with deltas used to compose the custom streaming curve. Milestones are calculated by
    /// starting from `block.timestamp` and adding each delta to the previous milestone.
    struct CreateWithDeltas {
        address sender;
        bool cancelable;
        bool transferable;
        address recipient;
        uint128 totalAmount;
        IERC20 asset;
        Broker broker;
        SegmentWithDelta[] segments;
    }

    /// @notice Struct encapsulating the parameters for the {SablierV2LockupDynamic.createWithMilestones}
    /// function.
    /// @param sender The address streaming the assets, with the ability to cancel the stream. It doesn't have to be the
    /// same as `msg.sender`.
    /// @param startTime The Unix timestamp indicating the stream's start.
    /// @param cancelable Indicates if the stream is cancelable.
    /// @param transferable Indicates if the stream NFT is transferable.
    /// @param recipient The address receiving the assets.
    /// @param totalAmount The total amount of ERC-20 assets to be paid, including the stream deposit and any potential
    /// fees, all denoted in units of the asset's decimals.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param broker Struct containing (i) the address of the broker assisting in creating the stream, and (ii) the
    /// percentage fee paid to the broker from `totalAmount`, denoted as a fixed-point number. Both can be set to zero.
    /// @param segments Segments used to compose the custom streaming curve.
    struct CreateWithMilestones {
        address sender;
        uint40 startTime;
        bool cancelable;
        bool transferable;
        address recipient;
        uint128 totalAmount;
        IERC20 asset;
        Broker broker;
        Segment[] segments;
    }

    /// @notice Struct encapsulating the time range.
    /// @param start The Unix timestamp indicating the stream's start.
    /// @param end The Unix timestamp indicating the stream's end.
    struct Range {
        uint40 start;
        uint40 end;
    }

    /// @notice Segment struct used in the Lockup Dynamic stream.
    /// @param amount The amount of assets to be streamed in this segment, denoted in units of the asset's decimals.
    /// @param exponent The exponent of this segment, denoted as a fixed-point number.
    /// @param milestone The Unix timestamp indicating this segment's end.
    struct Segment {
        // slot 0
        uint128 amount;
        UD2x18 exponent;
        uint40 milestone;
    }

    /// @notice Segment struct used at runtime in {SablierV2LockupDynamic.createWithDeltas}.
    /// @param amount The amount of assets to be streamed in this segment, denoted in units of the asset's decimals.
    /// @param exponent The exponent of this segment, denoted as a fixed-point number.
    /// @param delta The time difference in seconds between this segment and the previous one.
    struct SegmentWithDelta {
        uint128 amount;
        UD2x18 exponent;
        uint40 delta;
    }

    /// @notice Lockup Dynamic stream.
    /// @dev The fields are arranged like this to save gas via tight variable packing.
    /// @param sender The address streaming the assets, with the ability to cancel the stream.
    /// @param startTime The Unix timestamp indicating the stream's start.
    /// @param endTime The Unix timestamp indicating the stream's end.
    /// @param isCancelable Boolean indicating if the stream is cancelable.
    /// @param wasCanceled Boolean indicating if the stream was canceled.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param isDepleted Boolean indicating if the stream is depleted.
    /// @param isStream Boolean indicating if the struct entity exists.
    /// @param isTransferable Boolean indicating if the stream NFT is transferable.
    /// @param amounts Struct containing the deposit, withdrawn, and refunded amounts, all denoted in units of the
    /// asset's decimals.
    /// @param segments Segments used to compose the custom streaming curve.
    struct Stream {
        // slot 0
        address sender;
        uint40 startTime;
        uint40 endTime;
        bool isCancelable;
        bool wasCanceled;
        // slot 1
        IERC20 asset;
        bool isDepleted;
        bool isStream;
        bool isTransferable;
        // slot 2 and 3
        Lockup.Amounts amounts;
        // slots [4..n]
        Segment[] segments;
    }
}

/// @notice Namespace for the structs used in {SablierV2LockupLinear}.
library LockupLinear {
    /// @notice Struct encapsulating the parameters for the {SablierV2LockupLinear.createWithDurations} function.
    /// @param sender The address streaming the assets, with the ability to cancel the stream. It doesn't have to be the
    /// same as `msg.sender`.
    /// @param recipient The address receiving the assets.
    /// @param totalAmount The total amount of ERC-20 assets to be paid, including the stream deposit and any potential
    /// fees, all denoted in units of the asset's decimals.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param cancelable Indicates if the stream is cancelable.
    /// @param transferable Indicates if the stream NFT is transferable.
    /// @param durations Struct containing (i) cliff period duration and (ii) total stream duration, both in seconds.
    /// @param broker Struct containing (i) the address of the broker assisting in creating the stream, and (ii) the
    /// percentage fee paid to the broker from `totalAmount`, denoted as a fixed-point number. Both can be set to zero.
    struct CreateWithDurations {
        address sender;
        address recipient;
        uint128 totalAmount;
        IERC20 asset;
        bool cancelable;
        bool transferable;
        Durations durations;
        Broker broker;
    }

    /// @notice Struct encapsulating the parameters for the {SablierV2LockupLinear.createWithRange} function.
    /// @param sender The address streaming the assets, with the ability to cancel the stream. It doesn't have to be the
    /// same as `msg.sender`.
    /// @param recipient The address receiving the assets.
    /// @param totalAmount The total amount of ERC-20 assets to be paid, including the stream deposit and any potential
    /// fees, all denoted in units of the asset's decimals.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param cancelable Indicates if the stream is cancelable.
    /// @param transferable Indicates if the stream NFT is transferable.
    /// @param range Struct containing (i) the stream's start time, (ii) cliff time, and (iii) end time, all as Unix
    /// timestamps.
    /// @param broker Struct containing (i) the address of the broker assisting in creating the stream, and (ii) the
    /// percentage fee paid to the broker from `totalAmount`, denoted as a fixed-point number. Both can be set to zero.
    struct CreateWithRange {
        address sender;
        address recipient;
        uint128 totalAmount;
        IERC20 asset;
        bool cancelable;
        bool transferable;
        Range range;
        Broker broker;
    }

    /// @notice Struct encapsulating the cliff duration and the total duration.
    /// @param cliff The cliff duration in seconds.
    /// @param total The total duration in seconds.
    struct Durations {
        uint40 cliff;
        uint40 total;
    }

    /// @notice Struct encapsulating the time range.
    /// @param start The Unix timestamp for the stream's start.
    /// @param cliff The Unix timestamp for the cliff period's end.
    /// @param end The Unix timestamp for the stream's end.
    struct Range {
        uint40 start;
        uint40 cliff;
        uint40 end;
    }

    /// @notice Lockup Linear stream.
    /// @dev The fields are arranged like this to save gas via tight variable packing.
    /// @param sender The address streaming the assets, with the ability to cancel the stream.
    /// @param startTime The Unix timestamp indicating the stream's start.
    /// @param cliffTime The Unix timestamp indicating the cliff period's end.
    /// @param isCancelable Boolean indicating if the stream is cancelable.
    /// @param wasCanceled Boolean indicating if the stream was canceled.
    /// @param asset The contract address of the ERC-20 asset used for streaming.
    /// @param endTime The Unix timestamp indicating the stream's end.
    /// @param isDepleted Boolean indicating if the stream is depleted.
    /// @param isStream Boolean indicating if the struct entity exists.
    /// @param isTransferable Boolean indicating if the stream NFT is transferable.
    /// @param amounts Struct containing the deposit, withdrawn, and refunded amounts, all denoted in units of the
    /// asset's decimals.
    struct Stream {
        // slot 0
        address sender;
        uint40 startTime;
        uint40 cliffTime;
        bool isCancelable;
        bool wasCanceled;
        // slot 1
        IERC20 asset;
        uint40 endTime;
        bool isDepleted;
        bool isStream;
        bool isTransferable;
        // slot 2 and 3
        Lockup.Amounts amounts;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "./Errors.sol" as CastingErrors;
import { MAX_UINT128, MAX_UINT40 } from "../Common.sol";
import { uMAX_SD1x18 } from "../sd1x18/Constants.sol";
import { SD1x18 } from "../sd1x18/ValueType.sol";
import { uMAX_SD59x18 } from "../sd59x18/Constants.sol";
import { SD59x18 } from "../sd59x18/ValueType.sol";
import { uMAX_UD2x18 } from "../ud2x18/Constants.sol";
import { UD2x18 } from "../ud2x18/ValueType.sol";
import { UD60x18 } from "./ValueType.sol";

/// @notice Casts a UD60x18 number into SD1x18.
/// @dev Requirements:
/// - x must be less than or equal to `uMAX_SD1x18`.
function intoSD1x18(UD60x18 x) pure returns (SD1x18 result) {
    uint256 xUint = UD60x18.unwrap(x);
    if (xUint > uint256(int256(uMAX_SD1x18))) {
        revert CastingErrors.PRBMath_UD60x18_IntoSD1x18_Overflow(x);
    }
    result = SD1x18.wrap(int64(uint64(xUint)));
}

/// @notice Casts a UD60x18 number into UD2x18.
/// @dev Requirements:
/// - x must be less than or equal to `uMAX_UD2x18`.
function intoUD2x18(UD60x18 x) pure returns (UD2x18 result) {
    uint256 xUint = UD60x18.unwrap(x);
    if (xUint > uMAX_UD2x18) {
        revert CastingErrors.PRBMath_UD60x18_IntoUD2x18_Overflow(x);
    }
    result = UD2x18.wrap(uint64(xUint));
}

/// @notice Casts a UD60x18 number into SD59x18.
/// @dev Requirements:
/// - x must be less than or equal to `uMAX_SD59x18`.
function intoSD59x18(UD60x18 x) pure returns (SD59x18 result) {
    uint256 xUint = UD60x18.unwrap(x);
    if (xUint > uint256(uMAX_SD59x18)) {
        revert CastingErrors.PRBMath_UD60x18_IntoSD59x18_Overflow(x);
    }
    result = SD59x18.wrap(int256(xUint));
}

/// @notice Casts a UD60x18 number into uint128.
/// @dev This is basically an alias for {unwrap}.
function intoUint256(UD60x18 x) pure returns (uint256 result) {
    result = UD60x18.unwrap(x);
}

/// @notice Casts a UD60x18 number into uint128.
/// @dev Requirements:
/// - x must be less than or equal to `MAX_UINT128`.
function intoUint128(UD60x18 x) pure returns (uint128 result) {
    uint256 xUint = UD60x18.unwrap(x);
    if (xUint > MAX_UINT128) {
        revert CastingErrors.PRBMath_UD60x18_IntoUint128_Overflow(x);
    }
    result = uint128(xUint);
}

/// @notice Casts a UD60x18 number into uint40.
/// @dev Requirements:
/// - x must be less than or equal to `MAX_UINT40`.
function intoUint40(UD60x18 x) pure returns (uint40 result) {
    uint256 xUint = UD60x18.unwrap(x);
    if (xUint > MAX_UINT40) {
        revert CastingErrors.PRBMath_UD60x18_IntoUint40_Overflow(x);
    }
    result = uint40(xUint);
}

/// @notice Alias for {wrap}.
function ud(uint256 x) pure returns (UD60x18 result) {
    result = UD60x18.wrap(x);
}

/// @notice Alias for {wrap}.
function ud60x18(uint256 x) pure returns (UD60x18 result) {
    result = UD60x18.wrap(x);
}

/// @notice Unwraps a UD60x18 number into uint256.
function unwrap(UD60x18 x) pure returns (uint256 result) {
    result = UD60x18.unwrap(x);
}

/// @notice Wraps a uint256 number into the UD60x18 value type.
function wrap(uint256 x) pure returns (UD60x18 result) {
    result = UD60x18.wrap(x);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { UD60x18 } from "./ValueType.sol";

// NOTICE: the "u" prefix stands for "unwrapped".

/// @dev Euler's number as a UD60x18 number.
UD60x18 constant E = UD60x18.wrap(2_718281828459045235);

/// @dev The maximum input permitted in {exp}.
uint256 constant uEXP_MAX_INPUT = 133_084258667509499440;
UD60x18 constant EXP_MAX_INPUT = UD60x18.wrap(uEXP_MAX_INPUT);

/// @dev The maximum input permitted in {exp2}.
uint256 constant uEXP2_MAX_INPUT = 192e18 - 1;
UD60x18 constant EXP2_MAX_INPUT = UD60x18.wrap(uEXP2_MAX_INPUT);

/// @dev Half the UNIT number.
uint256 constant uHALF_UNIT = 0.5e18;
UD60x18 constant HALF_UNIT = UD60x18.wrap(uHALF_UNIT);

/// @dev $log_2(10)$ as a UD60x18 number.
uint256 constant uLOG2_10 = 3_321928094887362347;
UD60x18 constant LOG2_10 = UD60x18.wrap(uLOG2_10);

/// @dev $log_2(e)$ as a UD60x18 number.
uint256 constant uLOG2_E = 1_442695040888963407;
UD60x18 constant LOG2_E = UD60x18.wrap(uLOG2_E);

/// @dev The maximum value a UD60x18 number can have.
uint256 constant uMAX_UD60x18 = 115792089237316195423570985008687907853269984665640564039457_584007913129639935;
UD60x18 constant MAX_UD60x18 = UD60x18.wrap(uMAX_UD60x18);

/// @dev The maximum whole value a UD60x18 number can have.
uint256 constant uMAX_WHOLE_UD60x18 = 115792089237316195423570985008687907853269984665640564039457_000000000000000000;
UD60x18 constant MAX_WHOLE_UD60x18 = UD60x18.wrap(uMAX_WHOLE_UD60x18);

/// @dev PI as a UD60x18 number.
UD60x18 constant PI = UD60x18.wrap(3_141592653589793238);

/// @dev The unit number, which gives the decimal precision of UD60x18.
uint256 constant uUNIT = 1e18;
UD60x18 constant UNIT = UD60x18.wrap(uUNIT);

/// @dev The unit number squared.
uint256 constant uUNIT_SQUARED = 1e36;
UD60x18 constant UNIT_SQUARED = UD60x18.wrap(uUNIT_SQUARED);

/// @dev Zero as a UD60x18 number.
UD60x18 constant ZERO = UD60x18.wrap(0);

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { uMAX_UD60x18, uUNIT } from "./Constants.sol";
import { PRBMath_UD60x18_Convert_Overflow } from "./Errors.sol";
import { UD60x18 } from "./ValueType.sol";

/// @notice Converts a UD60x18 number to a simple integer by dividing it by `UNIT`.
/// @dev The result is rounded toward zero.
/// @param x The UD60x18 number to convert.
/// @return result The same number in basic integer form.
function convert(UD60x18 x) pure returns (uint256 result) {
    result = UD60x18.unwrap(x) / uUNIT;
}

/// @notice Converts a simple integer to UD60x18 by multiplying it by `UNIT`.
///
/// @dev Requirements:
/// - x must be less than or equal to `MAX_UD60x18 / UNIT`.
///
/// @param x The basic integer to convert.
/// @param result The same number converted to UD60x18.
function convert(uint256 x) pure returns (UD60x18 result) {
    if (x > uMAX_UD60x18 / uUNIT) {
        revert PRBMath_UD60x18_Convert_Overflow(x);
    }
    unchecked {
        result = UD60x18.wrap(x * uUNIT);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { UD60x18 } from "./ValueType.sol";

/// @notice Thrown when ceiling a number overflows UD60x18.
error PRBMath_UD60x18_Ceil_Overflow(UD60x18 x);

/// @notice Thrown when converting a basic integer to the fixed-point format overflows UD60x18.
error PRBMath_UD60x18_Convert_Overflow(uint256 x);

/// @notice Thrown when taking the natural exponent of a base greater than 133_084258667509499441.
error PRBMath_UD60x18_Exp_InputTooBig(UD60x18 x);

/// @notice Thrown when taking the binary exponent of a base greater than 192e18.
error PRBMath_UD60x18_Exp2_InputTooBig(UD60x18 x);

/// @notice Thrown when taking the geometric mean of two numbers and multiplying them overflows UD60x18.
error PRBMath_UD60x18_Gm_Overflow(UD60x18 x, UD60x18 y);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in SD1x18.
error PRBMath_UD60x18_IntoSD1x18_Overflow(UD60x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in SD59x18.
error PRBMath_UD60x18_IntoSD59x18_Overflow(UD60x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in UD2x18.
error PRBMath_UD60x18_IntoUD2x18_Overflow(UD60x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in uint128.
error PRBMath_UD60x18_IntoUint128_Overflow(UD60x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in uint40.
error PRBMath_UD60x18_IntoUint40_Overflow(UD60x18 x);

/// @notice Thrown when taking the logarithm of a number less than 1.
error PRBMath_UD60x18_Log_InputTooSmall(UD60x18 x);

/// @notice Thrown when calculating the square root overflows UD60x18.
error PRBMath_UD60x18_Sqrt_Overflow(UD60x18 x);

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { wrap } from "./Casting.sol";
import { UD60x18 } from "./ValueType.sol";

/// @notice Implements the checked addition operation (+) in the UD60x18 type.
function add(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() + y.unwrap());
}

/// @notice Implements the AND (&) bitwise operation in the UD60x18 type.
function and(UD60x18 x, uint256 bits) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() & bits);
}

/// @notice Implements the AND (&) bitwise operation in the UD60x18 type.
function and2(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() & y.unwrap());
}

/// @notice Implements the equal operation (==) in the UD60x18 type.
function eq(UD60x18 x, UD60x18 y) pure returns (bool result) {
    result = x.unwrap() == y.unwrap();
}

/// @notice Implements the greater than operation (>) in the UD60x18 type.
function gt(UD60x18 x, UD60x18 y) pure returns (bool result) {
    result = x.unwrap() > y.unwrap();
}

/// @notice Implements the greater than or equal to operation (>=) in the UD60x18 type.
function gte(UD60x18 x, UD60x18 y) pure returns (bool result) {
    result = x.unwrap() >= y.unwrap();
}

/// @notice Implements a zero comparison check function in the UD60x18 type.
function isZero(UD60x18 x) pure returns (bool result) {
    // This wouldn't work if x could be negative.
    result = x.unwrap() == 0;
}

/// @notice Implements the left shift operation (<<) in the UD60x18 type.
function lshift(UD60x18 x, uint256 bits) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() << bits);
}

/// @notice Implements the lower than operation (<) in the UD60x18 type.
function lt(UD60x18 x, UD60x18 y) pure returns (bool result) {
    result = x.unwrap() < y.unwrap();
}

/// @notice Implements the lower than or equal to operation (<=) in the UD60x18 type.
function lte(UD60x18 x, UD60x18 y) pure returns (bool result) {
    result = x.unwrap() <= y.unwrap();
}

/// @notice Implements the checked modulo operation (%) in the UD60x18 type.
function mod(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() % y.unwrap());
}

/// @notice Implements the not equal operation (!=) in the UD60x18 type.
function neq(UD60x18 x, UD60x18 y) pure returns (bool result) {
    result = x.unwrap() != y.unwrap();
}

/// @notice Implements the NOT (~) bitwise operation in the UD60x18 type.
function not(UD60x18 x) pure returns (UD60x18 result) {
    result = wrap(~x.unwrap());
}

/// @notice Implements the OR (|) bitwise operation in the UD60x18 type.
function or(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() | y.unwrap());
}

/// @notice Implements the right shift operation (>>) in the UD60x18 type.
function rshift(UD60x18 x, uint256 bits) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() >> bits);
}

/// @notice Implements the checked subtraction operation (-) in the UD60x18 type.
function sub(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() - y.unwrap());
}

/// @notice Implements the unchecked addition operation (+) in the UD60x18 type.
function uncheckedAdd(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    unchecked {
        result = wrap(x.unwrap() + y.unwrap());
    }
}

/// @notice Implements the unchecked subtraction operation (-) in the UD60x18 type.
function uncheckedSub(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    unchecked {
        result = wrap(x.unwrap() - y.unwrap());
    }
}

/// @notice Implements the XOR (^) bitwise operation in the UD60x18 type.
function xor(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(x.unwrap() ^ y.unwrap());
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "../Common.sol" as Common;
import "./Errors.sol" as Errors;
import { wrap } from "./Casting.sol";
import {
    uEXP_MAX_INPUT,
    uEXP2_MAX_INPUT,
    uHALF_UNIT,
    uLOG2_10,
    uLOG2_E,
    uMAX_UD60x18,
    uMAX_WHOLE_UD60x18,
    UNIT,
    uUNIT,
    uUNIT_SQUARED,
    ZERO
} from "./Constants.sol";
import { UD60x18 } from "./ValueType.sol";

/*//////////////////////////////////////////////////////////////////////////
                            MATHEMATICAL FUNCTIONS
//////////////////////////////////////////////////////////////////////////*/

/// @notice Calculates the arithmetic average of x and y using the following formula:
///
/// $$
/// avg(x, y) = (x & y) + ((xUint ^ yUint) / 2)
/// $$
///
/// In English, this is what this formula does:
///
/// 1. AND x and y.
/// 2. Calculate half of XOR x and y.
/// 3. Add the two results together.
///
/// This technique is known as SWAR, which stands for "SIMD within a register". You can read more about it here:
/// https://devblogs.microsoft.com/oldnewthing/20220207-00/?p=106223
///
/// @dev Notes:
/// - The result is rounded toward zero.
///
/// @param x The first operand as a UD60x18 number.
/// @param y The second operand as a UD60x18 number.
/// @return result The arithmetic average as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function avg(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();
    uint256 yUint = y.unwrap();
    unchecked {
        result = wrap((xUint & yUint) + ((xUint ^ yUint) >> 1));
    }
}

/// @notice Yields the smallest whole number greater than or equal to x.
///
/// @dev This is optimized for fractional value inputs, because for every whole value there are (1e18 - 1) fractional
/// counterparts. See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions.
///
/// Requirements:
/// - x must be less than or equal to `MAX_WHOLE_UD60x18`.
///
/// @param x The UD60x18 number to ceil.
/// @param result The smallest whole number greater than or equal to x, as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function ceil(UD60x18 x) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();
    if (xUint > uMAX_WHOLE_UD60x18) {
        revert Errors.PRBMath_UD60x18_Ceil_Overflow(x);
    }

    assembly ("memory-safe") {
        // Equivalent to `x % UNIT`.
        let remainder := mod(x, uUNIT)

        // Equivalent to `UNIT - remainder`.
        let delta := sub(uUNIT, remainder)

        // Equivalent to `x + remainder > 0 ? delta : 0`.
        result := add(x, mul(delta, gt(remainder, 0)))
    }
}

/// @notice Divides two UD60x18 numbers, returning a new UD60x18 number.
///
/// @dev Uses {Common.mulDiv} to enable overflow-safe multiplication and division.
///
/// Notes:
/// - Refer to the notes in {Common.mulDiv}.
///
/// Requirements:
/// - Refer to the requirements in {Common.mulDiv}.
///
/// @param x The numerator as a UD60x18 number.
/// @param y The denominator as a UD60x18 number.
/// @param result The quotient as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function div(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(Common.mulDiv(x.unwrap(), uUNIT, y.unwrap()));
}

/// @notice Calculates the natural exponent of x using the following formula:
///
/// $$
/// e^x = 2^{x * log_2{e}}
/// $$
///
/// @dev Requirements:
/// - x must be less than 133_084258667509499441.
///
/// @param x The exponent as a UD60x18 number.
/// @return result The result as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function exp(UD60x18 x) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();

    // This check prevents values greater than 192e18 from being passed to {exp2}.
    if (xUint > uEXP_MAX_INPUT) {
        revert Errors.PRBMath_UD60x18_Exp_InputTooBig(x);
    }

    unchecked {
        // Inline the fixed-point multiplication to save gas.
        uint256 doubleUnitProduct = xUint * uLOG2_E;
        result = exp2(wrap(doubleUnitProduct / uUNIT));
    }
}

/// @notice Calculates the binary exponent of x using the binary fraction method.
///
/// @dev See https://ethereum.stackexchange.com/q/79903/24693
///
/// Requirements:
/// - x must be less than 192e18.
/// - The result must fit in UD60x18.
///
/// @param x The exponent as a UD60x18 number.
/// @return result The result as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function exp2(UD60x18 x) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();

    // Numbers greater than or equal to 192e18 don't fit in the 192.64-bit format.
    if (xUint > uEXP2_MAX_INPUT) {
        revert Errors.PRBMath_UD60x18_Exp2_InputTooBig(x);
    }

    // Convert x to the 192.64-bit fixed-point format.
    uint256 x_192x64 = (xUint << 64) / uUNIT;

    // Pass x to the {Common.exp2} function, which uses the 192.64-bit fixed-point number representation.
    result = wrap(Common.exp2(x_192x64));
}

/// @notice Yields the greatest whole number less than or equal to x.
/// @dev Optimized for fractional value inputs, because every whole value has (1e18 - 1) fractional counterparts.
/// See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions.
/// @param x The UD60x18 number to floor.
/// @param result The greatest whole number less than or equal to x, as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function floor(UD60x18 x) pure returns (UD60x18 result) {
    assembly ("memory-safe") {
        // Equivalent to `x % UNIT`.
        let remainder := mod(x, uUNIT)

        // Equivalent to `x - remainder > 0 ? remainder : 0)`.
        result := sub(x, mul(remainder, gt(remainder, 0)))
    }
}

/// @notice Yields the excess beyond the floor of x using the odd function definition.
/// @dev See https://en.wikipedia.org/wiki/Fractional_part.
/// @param x The UD60x18 number to get the fractional part of.
/// @param result The fractional part of x as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function frac(UD60x18 x) pure returns (UD60x18 result) {
    assembly ("memory-safe") {
        result := mod(x, uUNIT)
    }
}

/// @notice Calculates the geometric mean of x and y, i.e. $\sqrt{x * y}$, rounding down.
///
/// @dev Requirements:
/// - x * y must fit in UD60x18.
///
/// @param x The first operand as a UD60x18 number.
/// @param y The second operand as a UD60x18 number.
/// @return result The result as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function gm(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();
    uint256 yUint = y.unwrap();
    if (xUint == 0 || yUint == 0) {
        return ZERO;
    }

    unchecked {
        // Checking for overflow this way is faster than letting Solidity do it.
        uint256 xyUint = xUint * yUint;
        if (xyUint / xUint != yUint) {
            revert Errors.PRBMath_UD60x18_Gm_Overflow(x, y);
        }

        // We don't need to multiply the result by `UNIT` here because the x*y product picked up a factor of `UNIT`
        // during multiplication. See the comments in {Common.sqrt}.
        result = wrap(Common.sqrt(xyUint));
    }
}

/// @notice Calculates the inverse of x.
///
/// @dev Notes:
/// - The result is rounded toward zero.
///
/// Requirements:
/// - x must not be zero.
///
/// @param x The UD60x18 number for which to calculate the inverse.
/// @return result The inverse as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function inv(UD60x18 x) pure returns (UD60x18 result) {
    unchecked {
        result = wrap(uUNIT_SQUARED / x.unwrap());
    }
}

/// @notice Calculates the natural logarithm of x using the following formula:
///
/// $$
/// ln{x} = log_2{x} / log_2{e}
/// $$
///
/// @dev Notes:
/// - Refer to the notes in {log2}.
/// - The precision isn't sufficiently fine-grained to return exactly `UNIT` when the input is `E`.
///
/// Requirements:
/// - Refer to the requirements in {log2}.
///
/// @param x The UD60x18 number for which to calculate the natural logarithm.
/// @return result The natural logarithm as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function ln(UD60x18 x) pure returns (UD60x18 result) {
    unchecked {
        // Inline the fixed-point multiplication to save gas. This is overflow-safe because the maximum value that
        // {log2} can return is ~196_205294292027477728.
        result = wrap(log2(x).unwrap() * uUNIT / uLOG2_E);
    }
}

/// @notice Calculates the common logarithm of x using the following formula:
///
/// $$
/// log_{10}{x} = log_2{x} / log_2{10}
/// $$
///
/// However, if x is an exact power of ten, a hard coded value is returned.
///
/// @dev Notes:
/// - Refer to the notes in {log2}.
///
/// Requirements:
/// - Refer to the requirements in {log2}.
///
/// @param x The UD60x18 number for which to calculate the common logarithm.
/// @return result The common logarithm as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function log10(UD60x18 x) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();
    if (xUint < uUNIT) {
        revert Errors.PRBMath_UD60x18_Log_InputTooSmall(x);
    }

    // Note that the `mul` in this assembly block is the standard multiplication operation, not {UD60x18.mul}.
    // prettier-ignore
    assembly ("memory-safe") {
        switch x
        case 1 { result := mul(uUNIT, sub(0, 18)) }
        case 10 { result := mul(uUNIT, sub(1, 18)) }
        case 100 { result := mul(uUNIT, sub(2, 18)) }
        case 1000 { result := mul(uUNIT, sub(3, 18)) }
        case 10000 { result := mul(uUNIT, sub(4, 18)) }
        case 100000 { result := mul(uUNIT, sub(5, 18)) }
        case 1000000 { result := mul(uUNIT, sub(6, 18)) }
        case 10000000 { result := mul(uUNIT, sub(7, 18)) }
        case 100000000 { result := mul(uUNIT, sub(8, 18)) }
        case 1000000000 { result := mul(uUNIT, sub(9, 18)) }
        case 10000000000 { result := mul(uUNIT, sub(10, 18)) }
        case 100000000000 { result := mul(uUNIT, sub(11, 18)) }
        case 1000000000000 { result := mul(uUNIT, sub(12, 18)) }
        case 10000000000000 { result := mul(uUNIT, sub(13, 18)) }
        case 100000000000000 { result := mul(uUNIT, sub(14, 18)) }
        case 1000000000000000 { result := mul(uUNIT, sub(15, 18)) }
        case 10000000000000000 { result := mul(uUNIT, sub(16, 18)) }
        case 100000000000000000 { result := mul(uUNIT, sub(17, 18)) }
        case 1000000000000000000 { result := 0 }
        case 10000000000000000000 { result := uUNIT }
        case 100000000000000000000 { result := mul(uUNIT, 2) }
        case 1000000000000000000000 { result := mul(uUNIT, 3) }
        case 10000000000000000000000 { result := mul(uUNIT, 4) }
        case 100000000000000000000000 { result := mul(uUNIT, 5) }
        case 1000000000000000000000000 { result := mul(uUNIT, 6) }
        case 10000000000000000000000000 { result := mul(uUNIT, 7) }
        case 100000000000000000000000000 { result := mul(uUNIT, 8) }
        case 1000000000000000000000000000 { result := mul(uUNIT, 9) }
        case 10000000000000000000000000000 { result := mul(uUNIT, 10) }
        case 100000000000000000000000000000 { result := mul(uUNIT, 11) }
        case 1000000000000000000000000000000 { result := mul(uUNIT, 12) }
        case 10000000000000000000000000000000 { result := mul(uUNIT, 13) }
        case 100000000000000000000000000000000 { result := mul(uUNIT, 14) }
        case 1000000000000000000000000000000000 { result := mul(uUNIT, 15) }
        case 10000000000000000000000000000000000 { result := mul(uUNIT, 16) }
        case 100000000000000000000000000000000000 { result := mul(uUNIT, 17) }
        case 1000000000000000000000000000000000000 { result := mul(uUNIT, 18) }
        case 10000000000000000000000000000000000000 { result := mul(uUNIT, 19) }
        case 100000000000000000000000000000000000000 { result := mul(uUNIT, 20) }
        case 1000000000000000000000000000000000000000 { result := mul(uUNIT, 21) }
        case 10000000000000000000000000000000000000000 { result := mul(uUNIT, 22) }
        case 100000000000000000000000000000000000000000 { result := mul(uUNIT, 23) }
        case 1000000000000000000000000000000000000000000 { result := mul(uUNIT, 24) }
        case 10000000000000000000000000000000000000000000 { result := mul(uUNIT, 25) }
        case 100000000000000000000000000000000000000000000 { result := mul(uUNIT, 26) }
        case 1000000000000000000000000000000000000000000000 { result := mul(uUNIT, 27) }
        case 10000000000000000000000000000000000000000000000 { result := mul(uUNIT, 28) }
        case 100000000000000000000000000000000000000000000000 { result := mul(uUNIT, 29) }
        case 1000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 30) }
        case 10000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 31) }
        case 100000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 32) }
        case 1000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 33) }
        case 10000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 34) }
        case 100000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 35) }
        case 1000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 36) }
        case 10000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 37) }
        case 100000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 38) }
        case 1000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 39) }
        case 10000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 40) }
        case 100000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 41) }
        case 1000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 42) }
        case 10000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 43) }
        case 100000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 44) }
        case 1000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 45) }
        case 10000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 46) }
        case 100000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 47) }
        case 1000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 48) }
        case 10000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 49) }
        case 100000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 50) }
        case 1000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 51) }
        case 10000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 52) }
        case 100000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 53) }
        case 1000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 54) }
        case 10000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 55) }
        case 100000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 56) }
        case 1000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 57) }
        case 10000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 58) }
        case 100000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 59) }
        default { result := uMAX_UD60x18 }
    }

    if (result.unwrap() == uMAX_UD60x18) {
        unchecked {
            // Inline the fixed-point division to save gas.
            result = wrap(log2(x).unwrap() * uUNIT / uLOG2_10);
        }
    }
}

/// @notice Calculates the binary logarithm of x using the iterative approximation algorithm:
///
/// $$
/// log_2{x} = n + log_2{y}, \text{ where } y = x*2^{-n}, \ y \in [1, 2)
/// $$
///
/// For $0 \leq x \lt 1$, the input is inverted:
///
/// $$
/// log_2{x} = -log_2{\frac{1}{x}}
/// $$
///
/// @dev See https://en.wikipedia.org/wiki/Binary_logarithm#Iterative_approximation
///
/// Notes:
/// - Due to the lossy precision of the iterative approximation, the results are not perfectly accurate to the last decimal.
///
/// Requirements:
/// - x must be greater than zero.
///
/// @param x The UD60x18 number for which to calculate the binary logarithm.
/// @return result The binary logarithm as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function log2(UD60x18 x) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();

    if (xUint < uUNIT) {
        revert Errors.PRBMath_UD60x18_Log_InputTooSmall(x);
    }

    unchecked {
        // Calculate the integer part of the logarithm.
        uint256 n = Common.msb(xUint / uUNIT);

        // This is the integer part of the logarithm as a UD60x18 number. The operation can't overflow because n
        // n is at most 255 and UNIT is 1e18.
        uint256 resultUint = n * uUNIT;

        // Calculate $y = x * 2^{-n}$.
        uint256 y = xUint >> n;

        // If y is the unit number, the fractional part is zero.
        if (y == uUNIT) {
            return wrap(resultUint);
        }

        // Calculate the fractional part via the iterative approximation.
        // The `delta >>= 1` part is equivalent to `delta /= 2`, but shifting bits is more gas efficient.
        uint256 DOUBLE_UNIT = 2e18;
        for (uint256 delta = uHALF_UNIT; delta > 0; delta >>= 1) {
            y = (y * y) / uUNIT;

            // Is y^2 >= 2e18 and so in the range [2e18, 4e18)?
            if (y >= DOUBLE_UNIT) {
                // Add the 2^{-m} factor to the logarithm.
                resultUint += delta;

                // Halve y, which corresponds to z/2 in the Wikipedia article.
                y >>= 1;
            }
        }
        result = wrap(resultUint);
    }
}

/// @notice Multiplies two UD60x18 numbers together, returning a new UD60x18 number.
///
/// @dev Uses {Common.mulDiv} to enable overflow-safe multiplication and division.
///
/// Notes:
/// - Refer to the notes in {Common.mulDiv}.
///
/// Requirements:
/// - Refer to the requirements in {Common.mulDiv}.
///
/// @dev See the documentation in {Common.mulDiv18}.
/// @param x The multiplicand as a UD60x18 number.
/// @param y The multiplier as a UD60x18 number.
/// @return result The product as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function mul(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    result = wrap(Common.mulDiv18(x.unwrap(), y.unwrap()));
}

/// @notice Raises x to the power of y.
///
/// For $1 \leq x \leq \infty$, the following standard formula is used:
///
/// $$
/// x^y = 2^{log_2{x} * y}
/// $$
///
/// For $0 \leq x \lt 1$, since the unsigned {log2} is undefined, an equivalent formula is used:
///
/// $$
/// i = \frac{1}{x}
/// w = 2^{log_2{i} * y}
/// x^y = \frac{1}{w}
/// $$
///
/// @dev Notes:
/// - Refer to the notes in {log2} and {mul}.
/// - Returns `UNIT` for 0^0.
/// - It may not perform well with very small values of x. Consider using SD59x18 as an alternative.
///
/// Requirements:
/// - Refer to the requirements in {exp2}, {log2}, and {mul}.
///
/// @param x The base as a UD60x18 number.
/// @param y The exponent as a UD60x18 number.
/// @return result The result as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function pow(UD60x18 x, UD60x18 y) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();
    uint256 yUint = y.unwrap();

    // If both x and y are zero, the result is `UNIT`. If just x is zero, the result is always zero.
    if (xUint == 0) {
        return yUint == 0 ? UNIT : ZERO;
    }
    // If x is `UNIT`, the result is always `UNIT`.
    else if (xUint == uUNIT) {
        return UNIT;
    }

    // If y is zero, the result is always `UNIT`.
    if (yUint == 0) {
        return UNIT;
    }
    // If y is `UNIT`, the result is always x.
    else if (yUint == uUNIT) {
        return x;
    }

    // If x is greater than `UNIT`, use the standard formula.
    if (xUint > uUNIT) {
        result = exp2(mul(log2(x), y));
    }
    // Conversely, if x is less than `UNIT`, use the equivalent formula.
    else {
        UD60x18 i = wrap(uUNIT_SQUARED / xUint);
        UD60x18 w = exp2(mul(log2(i), y));
        result = wrap(uUNIT_SQUARED / w.unwrap());
    }
}

/// @notice Raises x (a UD60x18 number) to the power y (an unsigned basic integer) using the well-known
/// algorithm "exponentiation by squaring".
///
/// @dev See https://en.wikipedia.org/wiki/Exponentiation_by_squaring.
///
/// Notes:
/// - Refer to the notes in {Common.mulDiv18}.
/// - Returns `UNIT` for 0^0.
///
/// Requirements:
/// - The result must fit in UD60x18.
///
/// @param x The base as a UD60x18 number.
/// @param y The exponent as a uint256.
/// @return result The result as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function powu(UD60x18 x, uint256 y) pure returns (UD60x18 result) {
    // Calculate the first iteration of the loop in advance.
    uint256 xUint = x.unwrap();
    uint256 resultUint = y & 1 > 0 ? xUint : uUNIT;

    // Equivalent to `for(y /= 2; y > 0; y /= 2)`.
    for (y >>= 1; y > 0; y >>= 1) {
        xUint = Common.mulDiv18(xUint, xUint);

        // Equivalent to `y % 2 == 1`.
        if (y & 1 > 0) {
            resultUint = Common.mulDiv18(resultUint, xUint);
        }
    }
    result = wrap(resultUint);
}

/// @notice Calculates the square root of x using the Babylonian method.
///
/// @dev See https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method.
///
/// Notes:
/// - The result is rounded toward zero.
///
/// Requirements:
/// - x must be less than `MAX_UD60x18 / UNIT`.
///
/// @param x The UD60x18 number for which to calculate the square root.
/// @return result The result as a UD60x18 number.
/// @custom:smtchecker abstract-function-nondet
function sqrt(UD60x18 x) pure returns (UD60x18 result) {
    uint256 xUint = x.unwrap();

    unchecked {
        if (xUint > uMAX_UD60x18 / uUNIT) {
            revert Errors.PRBMath_UD60x18_Sqrt_Overflow(x);
        }
        // Multiply x by `UNIT` to account for the factor of `UNIT` picked up when multiplying two UD60x18 numbers.
        // In this case, the two numbers are both the square root.
        result = wrap(Common.sqrt(xUint * uUNIT));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "./Casting.sol" as Casting;
import "./Helpers.sol" as Helpers;
import "./Math.sol" as Math;

/// @notice The unsigned 60.18-decimal fixed-point number representation, which can have up to 60 digits and up to 18
/// decimals. The values of this are bound by the minimum and the maximum values permitted by the Solidity type uint256.
/// @dev The value type is defined here so it can be imported in all other files.
type UD60x18 is uint256;

/*//////////////////////////////////////////////////////////////////////////
                                    CASTING
//////////////////////////////////////////////////////////////////////////*/

using {
    Casting.intoSD1x18,
    Casting.intoUD2x18,
    Casting.intoSD59x18,
    Casting.intoUint128,
    Casting.intoUint256,
    Casting.intoUint40,
    Casting.unwrap
} for UD60x18 global;

/*//////////////////////////////////////////////////////////////////////////
                            MATHEMATICAL FUNCTIONS
//////////////////////////////////////////////////////////////////////////*/

// The global "using for" directive makes the functions in this library callable on the UD60x18 type.
using {
    Math.avg,
    Math.ceil,
    Math.div,
    Math.exp,
    Math.exp2,
    Math.floor,
    Math.frac,
    Math.gm,
    Math.inv,
    Math.ln,
    Math.log10,
    Math.log2,
    Math.mul,
    Math.pow,
    Math.powu,
    Math.sqrt
} for UD60x18 global;

/*//////////////////////////////////////////////////////////////////////////
                                HELPER FUNCTIONS
//////////////////////////////////////////////////////////////////////////*/

// The global "using for" directive makes the functions in this library callable on the UD60x18 type.
using {
    Helpers.add,
    Helpers.and,
    Helpers.eq,
    Helpers.gt,
    Helpers.gte,
    Helpers.isZero,
    Helpers.lshift,
    Helpers.lt,
    Helpers.lte,
    Helpers.mod,
    Helpers.neq,
    Helpers.not,
    Helpers.or,
    Helpers.rshift,
    Helpers.sub,
    Helpers.uncheckedAdd,
    Helpers.uncheckedSub,
    Helpers.xor
} for UD60x18 global;

/*//////////////////////////////////////////////////////////////////////////
                                    OPERATORS
//////////////////////////////////////////////////////////////////////////*/

// The global "using for" directive makes it possible to use these operators on the UD60x18 type.
using {
    Helpers.add as +,
    Helpers.and2 as &,
    Math.div as /,
    Helpers.eq as ==,
    Helpers.gt as >,
    Helpers.gte as >=,
    Helpers.lt as <,
    Helpers.lte as <=,
    Helpers.or as |,
    Helpers.mod as %,
    Math.mul as *,
    Helpers.neq as !=,
    Helpers.not as ~,
    Helpers.sub as -,
    Helpers.xor as ^
} for UD60x18 global;

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC4906.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";
import "./IERC721.sol";

/// @title EIP-721 Metadata Update Extension
interface IERC4906 is IERC165, IERC721 {
    /// @dev This event emits when the metadata of a token is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFT.
    event MetadataUpdate(uint256 _tokenId);

    /// @dev This event emits when the metadata of a range of tokens is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFTs.
    event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { UD60x18 } from "@prb/math/src/UD60x18.sol";

import { IAdminable } from "../interfaces/IAdminable.sol";
import { ISablierV2Base } from "../interfaces/ISablierV2Base.sol";
import { ISablierV2Comptroller } from "../interfaces/ISablierV2Comptroller.sol";
import { Errors } from "../libraries/Errors.sol";
import { Adminable } from "./Adminable.sol";
import { NoDelegateCall } from "./NoDelegateCall.sol";

/// @title SablierV2Base
/// @notice See the documentation in {ISablierV2Base}.
abstract contract SablierV2Base is
    NoDelegateCall, // 0 inherited components
    ISablierV2Base, // 1 inherited component
    Adminable // 1 inherited component
{
    using SafeERC20 for IERC20;

    /*//////////////////////////////////////////////////////////////////////////
                                  PUBLIC CONSTANTS
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2Base
    UD60x18 public constant override MAX_FEE = UD60x18.wrap(0.1e18);

    /*//////////////////////////////////////////////////////////////////////////
                                   PUBLIC STORAGE
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2Base
    ISablierV2Comptroller public override comptroller;

    /// @inheritdoc ISablierV2Base
    mapping(IERC20 asset => uint128 revenues) public override protocolRevenues;

    /*//////////////////////////////////////////////////////////////////////////
                                     CONSTRUCTOR
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Emits a {TransferAdmin} event.
    /// @param initialAdmin The address of the initial contract admin.
    /// @param initialComptroller The address of the initial comptroller.
    constructor(address initialAdmin, ISablierV2Comptroller initialComptroller) {
        admin = initialAdmin;
        comptroller = initialComptroller;
        emit IAdminable.TransferAdmin({ oldAdmin: address(0), newAdmin: initialAdmin });
    }

    /*//////////////////////////////////////////////////////////////////////////
                         USER-FACING NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc ISablierV2Base
    function claimProtocolRevenues(IERC20 asset) external override onlyAdmin {
        // Checks: the protocol revenues are not zero.
        uint128 revenues = protocolRevenues[asset];
        if (revenues == 0) {
            revert Errors.SablierV2Base_NoProtocolRevenues(asset);
        }

        // Effects: set the protocol revenues to zero.
        protocolRevenues[asset] = 0;

        // Interactions: perform the ERC-20 transfer to pay the protocol revenues.
        asset.safeTransfer({ to: msg.sender, value: revenues });

        // Log the claim of the protocol revenues.
        emit ISablierV2Base.ClaimProtocolRevenues({ admin: msg.sender, asset: asset, protocolRevenues: revenues });
    }

    /// @inheritdoc ISablierV2Base
    function setComptroller(ISablierV2Comptroller newComptroller) external override onlyAdmin {
        // Effects: set the new comptroller.
        ISablierV2Comptroller oldComptroller = comptroller;
        comptroller = newComptroller;

        // Log the change of the comptroller.
        emit ISablierV2Base.SetComptroller({
            admin: msg.sender,
            oldComptroller: oldComptroller,
            newComptroller: newComptroller
        });
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

/// @title IAdminable
/// @notice Contract module that provides a basic access control mechanism, with an admin that can be
/// granted exclusive access to specific functions. The inheriting contract must set the initial admin
/// in the constructor.
interface IAdminable {
    /*//////////////////////////////////////////////////////////////////////////
                                       EVENTS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Emitted when the admin is transferred.
    /// @param oldAdmin The address of the old admin.
    /// @param newAdmin The address of the new admin.
    event TransferAdmin(address indexed oldAdmin, address indexed newAdmin);

    /*//////////////////////////////////////////////////////////////////////////
                                 CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice The address of the admin account or contract.
    function admin() external view returns (address);

    /*//////////////////////////////////////////////////////////////////////////
                               NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Transfers the contract admin to a new address.
    ///
    /// @dev Notes:
    /// - Does not revert if the admin is the same.
    /// - This function can potentially leave the contract without an admin, thereby removing any
    /// functionality that is only available to the admin.
    ///
    /// Requirements:
    /// - `msg.sender` must be the contract admin.
    ///
    /// @param newAdmin The address of the new admin.
    function transferAdmin(address newAdmin) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { UD60x18 } from "@prb/math/src/UD60x18.sol";

import { IAdminable } from "./IAdminable.sol";
import { ISablierV2Comptroller } from "./ISablierV2Comptroller.sol";

/// @title ISablierV2Base
/// @notice Base logic for all Sablier V2 streaming contracts.
interface ISablierV2Base is IAdminable {
    /*//////////////////////////////////////////////////////////////////////////
                                       EVENTS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Emitted when the admin claims all protocol revenues accrued for a particular ERC-20 asset.
    /// @param admin The address of the contract admin.
    /// @param asset The contract address of the ERC-20 asset the protocol revenues have been claimed for.
    /// @param protocolRevenues The amount of protocol revenues claimed, denoted in units of the asset's decimals.
    event ClaimProtocolRevenues(address indexed admin, IERC20 indexed asset, uint128 protocolRevenues);

    /// @notice Emitted when the admin sets a new comptroller contract.
    /// @param admin The address of the contract admin.
    /// @param oldComptroller The address of the old comptroller contract.
    /// @param newComptroller The address of the new comptroller contract.
    event SetComptroller(
        address indexed admin, ISablierV2Comptroller oldComptroller, ISablierV2Comptroller newComptroller
    );

    /*//////////////////////////////////////////////////////////////////////////
                                 CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Retrieves the maximum fee that can be charged by the protocol or a broker, denoted as a fixed-point
    /// number where 1e18 is 100%.
    /// @dev This value is hard coded as a constant.
    function MAX_FEE() external view returns (UD60x18);

    /// @notice Retrieves the address of the comptroller contract, responsible for the Sablier V2 protocol
    /// configuration.
    function comptroller() external view returns (ISablierV2Comptroller);

    /// @notice Retrieves the protocol revenues accrued for the provided ERC-20 asset, in units of the asset's
    /// decimals.
    /// @param asset The contract address of the ERC-20 asset to query.
    function protocolRevenues(IERC20 asset) external view returns (uint128 revenues);

    /*//////////////////////////////////////////////////////////////////////////
                               NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Claims all accumulated protocol revenues for the provided ERC-20 asset.
    ///
    /// @dev Emits a {ClaimProtocolRevenues} event.
    ///
    /// Requirements:
    /// - `msg.sender` must be the contract admin.
    ///
    /// @param asset The contract address of the ERC-20 asset for which to claim protocol revenues.
    function claimProtocolRevenues(IERC20 asset) external;

    /// @notice Assigns a new comptroller contract responsible for the protocol configuration.
    ///
    /// @dev Emits a {SetComptroller} event.
    ///
    /// Notes:
    /// - Does not revert if the comptroller is the same.
    ///
    /// Requirements:
    /// - `msg.sender` must be the contract admin.
    ///
    /// @param newComptroller The address of the new comptroller contract.
    function setComptroller(ISablierV2Comptroller newComptroller) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

/*

██████╗ ██████╗ ██████╗ ███╗   ███╗ █████╗ ████████╗██╗  ██╗
██╔══██╗██╔══██╗██╔══██╗████╗ ████║██╔══██╗╚══██╔══╝██║  ██║
██████╔╝██████╔╝██████╔╝██╔████╔██║███████║   ██║   ███████║
██╔═══╝ ██╔══██╗██╔══██╗██║╚██╔╝██║██╔══██║   ██║   ██╔══██║
██║     ██║  ██║██████╔╝██║ ╚═╝ ██║██║  ██║   ██║   ██║  ██║
╚═╝     ╚═╝  ╚═╝╚═════╝ ╚═╝     ╚═╝╚═╝  ╚═╝   ╚═╝   ╚═╝  ╚═╝

██╗   ██╗██████╗ ██████╗ ██╗  ██╗ ██╗ █████╗
██║   ██║██╔══██╗╚════██╗╚██╗██╔╝███║██╔══██╗
██║   ██║██║  ██║ █████╔╝ ╚███╔╝ ╚██║╚█████╔╝
██║   ██║██║  ██║██╔═══╝  ██╔██╗  ██║██╔══██╗
╚██████╔╝██████╔╝███████╗██╔╝ ██╗ ██║╚█████╔╝
 ╚═════╝ ╚═════╝ ╚══════╝╚═╝  ╚═╝ ╚═╝ ╚════╝

*/

import "./ud2x18/Casting.sol";
import "./ud2x18/Constants.sol";
import "./ud2x18/Errors.sol";
import "./ud2x18/ValueType.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

// Common.sol
//
// Common mathematical functions used in both SD59x18 and UD60x18. Note that these global functions do not
// always operate with SD59x18 and UD60x18 numbers.

/*//////////////////////////////////////////////////////////////////////////
                                CUSTOM ERRORS
//////////////////////////////////////////////////////////////////////////*/

/// @notice Thrown when the resultant value in {mulDiv} overflows uint256.
error PRBMath_MulDiv_Overflow(uint256 x, uint256 y, uint256 denominator);

/// @notice Thrown when the resultant value in {mulDiv18} overflows uint256.
error PRBMath_MulDiv18_Overflow(uint256 x, uint256 y);

/// @notice Thrown when one of the inputs passed to {mulDivSigned} is `type(int256).min`.
error PRBMath_MulDivSigned_InputTooSmall();

/// @notice Thrown when the resultant value in {mulDivSigned} overflows int256.
error PRBMath_MulDivSigned_Overflow(int256 x, int256 y);

/*//////////////////////////////////////////////////////////////////////////
                                    CONSTANTS
//////////////////////////////////////////////////////////////////////////*/

/// @dev The maximum value a uint128 number can have.
uint128 constant MAX_UINT128 = type(uint128).max;

/// @dev The maximum value a uint40 number can have.
uint40 constant MAX_UINT40 = type(uint40).max;

/// @dev The unit number, which the decimal precision of the fixed-point types.
uint256 constant UNIT = 1e18;

/// @dev The unit number inverted mod 2^256.
uint256 constant UNIT_INVERSE = 78156646155174841979727994598816262306175212592076161876661_508869554232690281;

/// @dev The the largest power of two that divides the decimal value of `UNIT`. The logarithm of this value is the least significant
/// bit in the binary representation of `UNIT`.
uint256 constant UNIT_LPOTD = 262144;

/*//////////////////////////////////////////////////////////////////////////
                                    FUNCTIONS
//////////////////////////////////////////////////////////////////////////*/

/// @notice Calculates the binary exponent of x using the binary fraction method.
/// @dev Has to use 192.64-bit fixed-point numbers. See https://ethereum.stackexchange.com/a/96594/24693.
/// @param x The exponent as an unsigned 192.64-bit fixed-point number.
/// @return result The result as an unsigned 60.18-decimal fixed-point number.
/// @custom:smtchecker abstract-function-nondet
function exp2(uint256 x) pure returns (uint256 result) {
    unchecked {
        // Start from 0.5 in the 192.64-bit fixed-point format.
        result = 0x800000000000000000000000000000000000000000000000;

        // The following logic multiplies the result by $\sqrt{2^{-i}}$ when the bit at position i is 1. Key points:
        //
        // 1. Intermediate results will not overflow, as the starting point is 2^191 and all magic factors are under 2^65.
        // 2. The rationale for organizing the if statements into groups of 8 is gas savings. If the result of performing
        // a bitwise AND operation between x and any value in the array [0x80; 0x40; 0x20; 0x10; 0x08; 0x04; 0x02; 0x01] is 1,
        // we know that `x & 0xFF` is also 1.
        if (x & 0xFF00000000000000 > 0) {
            if (x & 0x8000000000000000 > 0) {
                result = (result * 0x16A09E667F3BCC909) >> 64;
            }
            if (x & 0x4000000000000000 > 0) {
                result = (result * 0x1306FE0A31B7152DF) >> 64;
            }
            if (x & 0x2000000000000000 > 0) {
                result = (result * 0x1172B83C7D517ADCE) >> 64;
            }
            if (x & 0x1000000000000000 > 0) {
                result = (result * 0x10B5586CF9890F62A) >> 64;
            }
            if (x & 0x800000000000000 > 0) {
                result = (result * 0x1059B0D31585743AE) >> 64;
            }
            if (x & 0x400000000000000 > 0) {
                result = (result * 0x102C9A3E778060EE7) >> 64;
            }
            if (x & 0x200000000000000 > 0) {
                result = (result * 0x10163DA9FB33356D8) >> 64;
            }
            if (x & 0x100000000000000 > 0) {
                result = (result * 0x100B1AFA5ABCBED61) >> 64;
            }
        }

        if (x & 0xFF000000000000 > 0) {
            if (x & 0x80000000000000 > 0) {
                result = (result * 0x10058C86DA1C09EA2) >> 64;
            }
            if (x & 0x40000000000000 > 0) {
                result = (result * 0x1002C605E2E8CEC50) >> 64;
            }
            if (x & 0x20000000000000 > 0) {
                result = (result * 0x100162F3904051FA1) >> 64;
            }
            if (x & 0x10000000000000 > 0) {
                result = (result * 0x1000B175EFFDC76BA) >> 64;
            }
            if (x & 0x8000000000000 > 0) {
                result = (result * 0x100058BA01FB9F96D) >> 64;
            }
            if (x & 0x4000000000000 > 0) {
                result = (result * 0x10002C5CC37DA9492) >> 64;
            }
            if (x & 0x2000000000000 > 0) {
                result = (result * 0x1000162E525EE0547) >> 64;
            }
            if (x & 0x1000000000000 > 0) {
                result = (result * 0x10000B17255775C04) >> 64;
            }
        }

        if (x & 0xFF0000000000 > 0) {
            if (x & 0x800000000000 > 0) {
                result = (result * 0x1000058B91B5BC9AE) >> 64;
            }
            if (x & 0x400000000000 > 0) {
                result = (result * 0x100002C5C89D5EC6D) >> 64;
            }
            if (x & 0x200000000000 > 0) {
                result = (result * 0x10000162E43F4F831) >> 64;
            }
            if (x & 0x100000000000 > 0) {
                result = (result * 0x100000B1721BCFC9A) >> 64;
            }
            if (x & 0x80000000000 > 0) {
                result = (result * 0x10000058B90CF1E6E) >> 64;
            }
            if (x & 0x40000000000 > 0) {
                result = (result * 0x1000002C5C863B73F) >> 64;
            }
            if (x & 0x20000000000 > 0) {
                result = (result * 0x100000162E430E5A2) >> 64;
            }
            if (x & 0x10000000000 > 0) {
                result = (result * 0x1000000B172183551) >> 64;
            }
        }

        if (x & 0xFF00000000 > 0) {
            if (x & 0x8000000000 > 0) {
                result = (result * 0x100000058B90C0B49) >> 64;
            }
            if (x & 0x4000000000 > 0) {
                result = (result * 0x10000002C5C8601CC) >> 64;
            }
            if (x & 0x2000000000 > 0) {
                result = (result * 0x1000000162E42FFF0) >> 64;
            }
            if (x & 0x1000000000 > 0) {
                result = (result * 0x10000000B17217FBB) >> 64;
            }
            if (x & 0x800000000 > 0) {
                result = (result * 0x1000000058B90BFCE) >> 64;
            }
            if (x & 0x400000000 > 0) {
                result = (result * 0x100000002C5C85FE3) >> 64;
            }
            if (x & 0x200000000 > 0) {
                result = (result * 0x10000000162E42FF1) >> 64;
            }
            if (x & 0x100000000 > 0) {
                result = (result * 0x100000000B17217F8) >> 64;
            }
        }

        if (x & 0xFF000000 > 0) {
            if (x & 0x80000000 > 0) {
                result = (result * 0x10000000058B90BFC) >> 64;
            }
            if (x & 0x40000000 > 0) {
                result = (result * 0x1000000002C5C85FE) >> 64;
            }
            if (x & 0x20000000 > 0) {
                result = (result * 0x100000000162E42FF) >> 64;
            }
            if (x & 0x10000000 > 0) {
                result = (result * 0x1000000000B17217F) >> 64;
            }
            if (x & 0x8000000 > 0) {
                result = (result * 0x100000000058B90C0) >> 64;
            }
            if (x & 0x4000000 > 0) {
                result = (result * 0x10000000002C5C860) >> 64;
            }
            if (x & 0x2000000 > 0) {
                result = (result * 0x1000000000162E430) >> 64;
            }
            if (x & 0x1000000 > 0) {
                result = (result * 0x10000000000B17218) >> 64;
            }
        }

        if (x & 0xFF0000 > 0) {
            if (x & 0x800000 > 0) {
                result = (result * 0x1000000000058B90C) >> 64;
            }
            if (x & 0x400000 > 0) {
                result = (result * 0x100000000002C5C86) >> 64;
            }
            if (x & 0x200000 > 0) {
                result = (result * 0x10000000000162E43) >> 64;
            }
            if (x & 0x100000 > 0) {
                result = (result * 0x100000000000B1721) >> 64;
            }
            if (x & 0x80000 > 0) {
                result = (result * 0x10000000000058B91) >> 64;
            }
            if (x & 0x40000 > 0) {
                result = (result * 0x1000000000002C5C8) >> 64;
            }
            if (x & 0x20000 > 0) {
                result = (result * 0x100000000000162E4) >> 64;
            }
            if (x & 0x10000 > 0) {
                result = (result * 0x1000000000000B172) >> 64;
            }
        }

        if (x & 0xFF00 > 0) {
            if (x & 0x8000 > 0) {
                result = (result * 0x100000000000058B9) >> 64;
            }
            if (x & 0x4000 > 0) {
                result = (result * 0x10000000000002C5D) >> 64;
            }
            if (x & 0x2000 > 0) {
                result = (result * 0x1000000000000162E) >> 64;
            }
            if (x & 0x1000 > 0) {
                result = (result * 0x10000000000000B17) >> 64;
            }
            if (x & 0x800 > 0) {
                result = (result * 0x1000000000000058C) >> 64;
            }
            if (x & 0x400 > 0) {
                result = (result * 0x100000000000002C6) >> 64;
            }
            if (x & 0x200 > 0) {
                result = (result * 0x10000000000000163) >> 64;
            }
            if (x & 0x100 > 0) {
                result = (result * 0x100000000000000B1) >> 64;
            }
        }

        if (x & 0xFF > 0) {
            if (x & 0x80 > 0) {
                result = (result * 0x10000000000000059) >> 64;
            }
            if (x & 0x40 > 0) {
                result = (result * 0x1000000000000002C) >> 64;
            }
            if (x & 0x20 > 0) {
                result = (result * 0x10000000000000016) >> 64;
            }
            if (x & 0x10 > 0) {
                result = (result * 0x1000000000000000B) >> 64;
            }
            if (x & 0x8 > 0) {
                result = (result * 0x10000000000000006) >> 64;
            }
            if (x & 0x4 > 0) {
                result = (result * 0x10000000000000003) >> 64;
            }
            if (x & 0x2 > 0) {
                result = (result * 0x10000000000000001) >> 64;
            }
            if (x & 0x1 > 0) {
                result = (result * 0x10000000000000001) >> 64;
            }
        }

        // In the code snippet below, two operations are executed simultaneously:
        //
        // 1. The result is multiplied by $(2^n + 1)$, where $2^n$ represents the integer part, and the additional 1
        // accounts for the initial guess of 0.5. This is achieved by subtracting from 191 instead of 192.
        // 2. The result is then converted to an unsigned 60.18-decimal fixed-point format.
        //
        // The underlying logic is based on the relationship $2^{191-ip} = 2^{ip} / 2^{191}$, where $ip$ denotes the,
        // integer part, $2^n$.
        result *= UNIT;
        result >>= (191 - (x >> 64));
    }
}

/// @notice Finds the zero-based index of the first 1 in the binary representation of x.
///
/// @dev See the note on "msb" in this Wikipedia article: https://en.wikipedia.org/wiki/Find_first_set
///
/// Each step in this implementation is equivalent to this high-level code:
///
/// ```solidity
/// if (x >= 2 ** 128) {
///     x >>= 128;
///     result += 128;
/// }
/// ```
///
/// Where 128 is replaced with each respective power of two factor. See the full high-level implementation here:
/// https://gist.github.com/PaulRBerg/f932f8693f2733e30c4d479e8e980948
///
/// The Yul instructions used below are:
///
/// - "gt" is "greater than"
/// - "or" is the OR bitwise operator
/// - "shl" is "shift left"
/// - "shr" is "shift right"
///
/// @param x The uint256 number for which to find the index of the most significant bit.
/// @return result The index of the most significant bit as a uint256.
/// @custom:smtchecker abstract-function-nondet
function msb(uint256 x) pure returns (uint256 result) {
    // 2^128
    assembly ("memory-safe") {
        let factor := shl(7, gt(x, 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF))
        x := shr(factor, x)
        result := or(result, factor)
    }
    // 2^64
    assembly ("memory-safe") {
        let factor := shl(6, gt(x, 0xFFFFFFFFFFFFFFFF))
        x := shr(factor, x)
        result := or(result, factor)
    }
    // 2^32
    assembly ("memory-safe") {
        let factor := shl(5, gt(x, 0xFFFFFFFF))
        x := shr(factor, x)
        result := or(result, factor)
    }
    // 2^16
    assembly ("memory-safe") {
        let factor := shl(4, gt(x, 0xFFFF))
        x := shr(factor, x)
        result := or(result, factor)
    }
    // 2^8
    assembly ("memory-safe") {
        let factor := shl(3, gt(x, 0xFF))
        x := shr(factor, x)
        result := or(result, factor)
    }
    // 2^4
    assembly ("memory-safe") {
        let factor := shl(2, gt(x, 0xF))
        x := shr(factor, x)
        result := or(result, factor)
    }
    // 2^2
    assembly ("memory-safe") {
        let factor := shl(1, gt(x, 0x3))
        x := shr(factor, x)
        result := or(result, factor)
    }
    // 2^1
    // No need to shift x any more.
    assembly ("memory-safe") {
        let factor := gt(x, 0x1)
        result := or(result, factor)
    }
}

/// @notice Calculates x*y÷denominator with 512-bit precision.
///
/// @dev Credits to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv.
///
/// Notes:
/// - The result is rounded toward zero.
///
/// Requirements:
/// - The denominator must not be zero.
/// - The result must fit in uint256.
///
/// @param x The multiplicand as a uint256.
/// @param y The multiplier as a uint256.
/// @param denominator The divisor as a uint256.
/// @return result The result as a uint256.
/// @custom:smtchecker abstract-function-nondet
function mulDiv(uint256 x, uint256 y, uint256 denominator) pure returns (uint256 result) {
    // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
    // use the Chinese Remainder Theorem to reconstruct the 512-bit result. The result is stored in two 256
    // variables such that product = prod1 * 2^256 + prod0.
    uint256 prod0; // Least significant 256 bits of the product
    uint256 prod1; // Most significant 256 bits of the product
    assembly ("memory-safe") {
        let mm := mulmod(x, y, not(0))
        prod0 := mul(x, y)
        prod1 := sub(sub(mm, prod0), lt(mm, prod0))
    }

    // Handle non-overflow cases, 256 by 256 division.
    if (prod1 == 0) {
        unchecked {
            return prod0 / denominator;
        }
    }

    // Make sure the result is less than 2^256. Also prevents denominator == 0.
    if (prod1 >= denominator) {
        revert PRBMath_MulDiv_Overflow(x, y, denominator);
    }

    ////////////////////////////////////////////////////////////////////////////
    // 512 by 256 division
    ////////////////////////////////////////////////////////////////////////////

    // Make division exact by subtracting the remainder from [prod1 prod0].
    uint256 remainder;
    assembly ("memory-safe") {
        // Compute remainder using the mulmod Yul instruction.
        remainder := mulmod(x, y, denominator)

        // Subtract 256 bit number from 512-bit number.
        prod1 := sub(prod1, gt(remainder, prod0))
        prod0 := sub(prod0, remainder)
    }

    unchecked {
        // Calculate the largest power of two divisor of the denominator using the unary operator ~. This operation cannot overflow
        // because the denominator cannot be zero at this point in the function execution. The result is always >= 1.
        // For more detail, see https://cs.stackexchange.com/q/138556/92363.
        uint256 lpotdod = denominator & (~denominator + 1);
        uint256 flippedLpotdod;

        assembly ("memory-safe") {
            // Factor powers of two out of denominator.
            denominator := div(denominator, lpotdod)

            // Divide [prod1 prod0] by lpotdod.
            prod0 := div(prod0, lpotdod)

            // Get the flipped value `2^256 / lpotdod`. If the `lpotdod` is zero, the flipped value is one.
            // `sub(0, lpotdod)` produces the two's complement version of `lpotdod`, which is equivalent to flipping all the bits.
            // However, `div` interprets this value as an unsigned value: https://ethereum.stackexchange.com/q/147168/24693
            flippedLpotdod := add(div(sub(0, lpotdod), lpotdod), 1)
        }

        // Shift in bits from prod1 into prod0.
        prod0 |= prod1 * flippedLpotdod;

        // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
        // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
        // four bits. That is, denominator * inv = 1 mod 2^4.
        uint256 inverse = (3 * denominator) ^ 2;

        // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
        // in modular arithmetic, doubling the correct bits in each step.
        inverse *= 2 - denominator * inverse; // inverse mod 2^8
        inverse *= 2 - denominator * inverse; // inverse mod 2^16
        inverse *= 2 - denominator * inverse; // inverse mod 2^32
        inverse *= 2 - denominator * inverse; // inverse mod 2^64
        inverse *= 2 - denominator * inverse; // inverse mod 2^128
        inverse *= 2 - denominator * inverse; // inverse mod 2^256

        // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
        // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
        // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
        // is no longer required.
        result = prod0 * inverse;
    }
}

/// @notice Calculates x*y÷1e18 with 512-bit precision.
///
/// @dev A variant of {mulDiv} with constant folding, i.e. in which the denominator is hard coded to 1e18.
///
/// Notes:
/// - The body is purposely left uncommented; to understand how this works, see the documentation in {mulDiv}.
/// - The result is rounded toward zero.
/// - We take as an axiom that the result cannot be `MAX_UINT256` when x and y solve the following system of equations:
///
/// $$
/// \begin{cases}
///     x * y = MAX\_UINT256 * UNIT \\
///     (x * y) \% UNIT \geq \frac{UNIT}{2}
/// \end{cases}
/// $$
///
/// Requirements:
/// - Refer to the requirements in {mulDiv}.
/// - The result must fit in uint256.
///
/// @param x The multiplicand as an unsigned 60.18-decimal fixed-point number.
/// @param y The multiplier as an unsigned 60.18-decimal fixed-point number.
/// @return result The result as an unsigned 60.18-decimal fixed-point number.
/// @custom:smtchecker abstract-function-nondet
function mulDiv18(uint256 x, uint256 y) pure returns (uint256 result) {
    uint256 prod0;
    uint256 prod1;
    assembly ("memory-safe") {
        let mm := mulmod(x, y, not(0))
        prod0 := mul(x, y)
        prod1 := sub(sub(mm, prod0), lt(mm, prod0))
    }

    if (prod1 == 0) {
        unchecked {
            return prod0 / UNIT;
        }
    }

    if (prod1 >= UNIT) {
        revert PRBMath_MulDiv18_Overflow(x, y);
    }

    uint256 remainder;
    assembly ("memory-safe") {
        remainder := mulmod(x, y, UNIT)
        result :=
            mul(
                or(
                    div(sub(prod0, remainder), UNIT_LPOTD),
                    mul(sub(prod1, gt(remainder, prod0)), add(div(sub(0, UNIT_LPOTD), UNIT_LPOTD), 1))
                ),
                UNIT_INVERSE
            )
    }
}

/// @notice Calculates x*y÷denominator with 512-bit precision.
///
/// @dev This is an extension of {mulDiv} for signed numbers, which works by computing the signs and the absolute values separately.
///
/// Notes:
/// - The result is rounded toward zero.
///
/// Requirements:
/// - Refer to the requirements in {mulDiv}.
/// - None of the inputs can be `type(int256).min`.
/// - The result must fit in int256.
///
/// @param x The multiplicand as an int256.
/// @param y The multiplier as an int256.
/// @param denominator The divisor as an int256.
/// @return result The result as an int256.
/// @custom:smtchecker abstract-function-nondet
function mulDivSigned(int256 x, int256 y, int256 denominator) pure returns (int256 result) {
    if (x == type(int256).min || y == type(int256).min || denominator == type(int256).min) {
        revert PRBMath_MulDivSigned_InputTooSmall();
    }

    // Get hold of the absolute values of x, y and the denominator.
    uint256 xAbs;
    uint256 yAbs;
    uint256 dAbs;
    unchecked {
        xAbs = x < 0 ? uint256(-x) : uint256(x);
        yAbs = y < 0 ? uint256(-y) : uint256(y);
        dAbs = denominator < 0 ? uint256(-denominator) : uint256(denominator);
    }

    // Compute the absolute value of x*y÷denominator. The result must fit in int256.
    uint256 resultAbs = mulDiv(xAbs, yAbs, dAbs);
    if (resultAbs > uint256(type(int256).max)) {
        revert PRBMath_MulDivSigned_Overflow(x, y);
    }

    // Get the signs of x, y and the denominator.
    uint256 sx;
    uint256 sy;
    uint256 sd;
    assembly ("memory-safe") {
        // "sgt" is the "signed greater than" assembly instruction and "sub(0,1)" is -1 in two's complement.
        sx := sgt(x, sub(0, 1))
        sy := sgt(y, sub(0, 1))
        sd := sgt(denominator, sub(0, 1))
    }

    // XOR over sx, sy and sd. What this does is to check whether there are 1 or 3 negative signs in the inputs.
    // If there are, the result should be negative. Otherwise, it should be positive.
    unchecked {
        result = sx ^ sy ^ sd == 0 ? -int256(resultAbs) : int256(resultAbs);
    }
}

/// @notice Calculates the square root of x using the Babylonian method.
///
/// @dev See https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method.
///
/// Notes:
/// - If x is not a perfect square, the result is rounded down.
/// - Credits to OpenZeppelin for the explanations in comments below.
///
/// @param x The uint256 number for which to calculate the square root.
/// @return result The result as a uint256.
/// @custom:smtchecker abstract-function-nondet
function sqrt(uint256 x) pure returns (uint256 result) {
    if (x == 0) {
        return 0;
    }

    // For our first guess, we calculate the biggest power of 2 which is smaller than the square root of x.
    //
    // We know that the "msb" (most significant bit) of x is a power of 2 such that we have:
    //
    // $$
    // msb(x) <= x <= 2*msb(x)$
    // $$
    //
    // We write $msb(x)$ as $2^k$, and we get:
    //
    // $$
    // k = log_2(x)
    // $$
    //
    // Thus, we can write the initial inequality as:
    //
    // $$
    // 2^{log_2(x)} <= x <= 2*2^{log_2(x)+1} \\
    // sqrt(2^k) <= sqrt(x) < sqrt(2^{k+1}) \\
    // 2^{k/2} <= sqrt(x) < 2^{(k+1)/2} <= 2^{(k/2)+1}
    // $$
    //
    // Consequently, $2^{log_2(x) /2} is a good first approximation of sqrt(x) with at least one correct bit.
    uint256 xAux = uint256(x);
    result = 1;
    if (xAux >= 2 ** 128) {
        xAux >>= 128;
        result <<= 64;
    }
    if (xAux >= 2 ** 64) {
        xAux >>= 64;
        result <<= 32;
    }
    if (xAux >= 2 ** 32) {
        xAux >>= 32;
        result <<= 16;
    }
    if (xAux >= 2 ** 16) {
        xAux >>= 16;
        result <<= 8;
    }
    if (xAux >= 2 ** 8) {
        xAux >>= 8;
        result <<= 4;
    }
    if (xAux >= 2 ** 4) {
        xAux >>= 4;
        result <<= 2;
    }
    if (xAux >= 2 ** 2) {
        result <<= 1;
    }

    // At this point, `result` is an estimation with at least one bit of precision. We know the true value has at
    // most 128 bits, since it is the square root of a uint256. Newton's method converges quadratically (precision
    // doubles at every iteration). We thus need at most 7 iteration to turn our partial result with one bit of
    // precision into the expected uint128 result.
    unchecked {
        result = (result + x / result) >> 1;
        result = (result + x / result) >> 1;
        result = (result + x / result) >> 1;
        result = (result + x / result) >> 1;
        result = (result + x / result) >> 1;
        result = (result + x / result) >> 1;
        result = (result + x / result) >> 1;

        // If x is not a perfect square, round the result toward zero.
        uint256 roundedResult = x / result;
        if (result >= roundedResult) {
            result = roundedResult;
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { SD1x18 } from "./ValueType.sol";

/// @dev Euler's number as an SD1x18 number.
SD1x18 constant E = SD1x18.wrap(2_718281828459045235);

/// @dev The maximum value an SD1x18 number can have.
int64 constant uMAX_SD1x18 = 9_223372036854775807;
SD1x18 constant MAX_SD1x18 = SD1x18.wrap(uMAX_SD1x18);

/// @dev The maximum value an SD1x18 number can have.
int64 constant uMIN_SD1x18 = -9_223372036854775808;
SD1x18 constant MIN_SD1x18 = SD1x18.wrap(uMIN_SD1x18);

/// @dev PI as an SD1x18 number.
SD1x18 constant PI = SD1x18.wrap(3_141592653589793238);

/// @dev The unit number, which gives the decimal precision of SD1x18.
SD1x18 constant UNIT = SD1x18.wrap(1e18);
int256 constant uUNIT = 1e18;

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "./Casting.sol" as Casting;

/// @notice The signed 1.18-decimal fixed-point number representation, which can have up to 1 digit and up to 18
/// decimals. The values of this are bound by the minimum and the maximum values permitted by the underlying Solidity
/// type int64. This is useful when end users want to use int64 to save gas, e.g. with tight variable packing in contract
/// storage.
type SD1x18 is int64;

/*//////////////////////////////////////////////////////////////////////////
                                    CASTING
//////////////////////////////////////////////////////////////////////////*/

using {
    Casting.intoSD59x18,
    Casting.intoUD2x18,
    Casting.intoUD60x18,
    Casting.intoUint256,
    Casting.intoUint128,
    Casting.intoUint40,
    Casting.unwrap
} for SD1x18 global;

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { SD59x18 } from "./ValueType.sol";

// NOTICE: the "u" prefix stands for "unwrapped".

/// @dev Euler's number as an SD59x18 number.
SD59x18 constant E = SD59x18.wrap(2_718281828459045235);

/// @dev The maximum input permitted in {exp}.
int256 constant uEXP_MAX_INPUT = 133_084258667509499440;
SD59x18 constant EXP_MAX_INPUT = SD59x18.wrap(uEXP_MAX_INPUT);

/// @dev The maximum input permitted in {exp2}.
int256 constant uEXP2_MAX_INPUT = 192e18 - 1;
SD59x18 constant EXP2_MAX_INPUT = SD59x18.wrap(uEXP2_MAX_INPUT);

/// @dev Half the UNIT number.
int256 constant uHALF_UNIT = 0.5e18;
SD59x18 constant HALF_UNIT = SD59x18.wrap(uHALF_UNIT);

/// @dev $log_2(10)$ as an SD59x18 number.
int256 constant uLOG2_10 = 3_321928094887362347;
SD59x18 constant LOG2_10 = SD59x18.wrap(uLOG2_10);

/// @dev $log_2(e)$ as an SD59x18 number.
int256 constant uLOG2_E = 1_442695040888963407;
SD59x18 constant LOG2_E = SD59x18.wrap(uLOG2_E);

/// @dev The maximum value an SD59x18 number can have.
int256 constant uMAX_SD59x18 = 57896044618658097711785492504343953926634992332820282019728_792003956564819967;
SD59x18 constant MAX_SD59x18 = SD59x18.wrap(uMAX_SD59x18);

/// @dev The maximum whole value an SD59x18 number can have.
int256 constant uMAX_WHOLE_SD59x18 = 57896044618658097711785492504343953926634992332820282019728_000000000000000000;
SD59x18 constant MAX_WHOLE_SD59x18 = SD59x18.wrap(uMAX_WHOLE_SD59x18);

/// @dev The minimum value an SD59x18 number can have.
int256 constant uMIN_SD59x18 = -57896044618658097711785492504343953926634992332820282019728_792003956564819968;
SD59x18 constant MIN_SD59x18 = SD59x18.wrap(uMIN_SD59x18);

/// @dev The minimum whole value an SD59x18 number can have.
int256 constant uMIN_WHOLE_SD59x18 = -57896044618658097711785492504343953926634992332820282019728_000000000000000000;
SD59x18 constant MIN_WHOLE_SD59x18 = SD59x18.wrap(uMIN_WHOLE_SD59x18);

/// @dev PI as an SD59x18 number.
SD59x18 constant PI = SD59x18.wrap(3_141592653589793238);

/// @dev The unit number, which gives the decimal precision of SD59x18.
int256 constant uUNIT = 1e18;
SD59x18 constant UNIT = SD59x18.wrap(1e18);

/// @dev The unit number squared.
int256 constant uUNIT_SQUARED = 1e36;
SD59x18 constant UNIT_SQUARED = SD59x18.wrap(uUNIT_SQUARED);

/// @dev Zero as an SD59x18 number.
SD59x18 constant ZERO = SD59x18.wrap(0);

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "./Casting.sol" as Casting;
import "./Helpers.sol" as Helpers;
import "./Math.sol" as Math;

/// @notice The signed 59.18-decimal fixed-point number representation, which can have up to 59 digits and up to 18
/// decimals. The values of this are bound by the minimum and the maximum values permitted by the underlying Solidity
/// type int256.
type SD59x18 is int256;

/*//////////////////////////////////////////////////////////////////////////
                                    CASTING
//////////////////////////////////////////////////////////////////////////*/

using {
    Casting.intoInt256,
    Casting.intoSD1x18,
    Casting.intoUD2x18,
    Casting.intoUD60x18,
    Casting.intoUint256,
    Casting.intoUint128,
    Casting.intoUint40,
    Casting.unwrap
} for SD59x18 global;

/*//////////////////////////////////////////////////////////////////////////
                            MATHEMATICAL FUNCTIONS
//////////////////////////////////////////////////////////////////////////*/

using {
    Math.abs,
    Math.avg,
    Math.ceil,
    Math.div,
    Math.exp,
    Math.exp2,
    Math.floor,
    Math.frac,
    Math.gm,
    Math.inv,
    Math.log10,
    Math.log2,
    Math.ln,
    Math.mul,
    Math.pow,
    Math.powu,
    Math.sqrt
} for SD59x18 global;

/*//////////////////////////////////////////////////////////////////////////
                                HELPER FUNCTIONS
//////////////////////////////////////////////////////////////////////////*/

using {
    Helpers.add,
    Helpers.and,
    Helpers.eq,
    Helpers.gt,
    Helpers.gte,
    Helpers.isZero,
    Helpers.lshift,
    Helpers.lt,
    Helpers.lte,
    Helpers.mod,
    Helpers.neq,
    Helpers.not,
    Helpers.or,
    Helpers.rshift,
    Helpers.sub,
    Helpers.uncheckedAdd,
    Helpers.uncheckedSub,
    Helpers.uncheckedUnary,
    Helpers.xor
} for SD59x18 global;

/*//////////////////////////////////////////////////////////////////////////
                                    OPERATORS
//////////////////////////////////////////////////////////////////////////*/

// The global "using for" directive makes it possible to use these operators on the SD59x18 type.
using {
    Helpers.add as +,
    Helpers.and2 as &,
    Math.div as /,
    Helpers.eq as ==,
    Helpers.gt as >,
    Helpers.gte as >=,
    Helpers.lt as <,
    Helpers.lte as <=,
    Helpers.mod as %,
    Math.mul as *,
    Helpers.neq as !=,
    Helpers.not as ~,
    Helpers.or as |,
    Helpers.sub as -,
    Helpers.unary as -,
    Helpers.xor as ^
} for SD59x18 global;

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { UD2x18 } from "./ValueType.sol";

/// @dev Euler's number as a UD2x18 number.
UD2x18 constant E = UD2x18.wrap(2_718281828459045235);

/// @dev The maximum value a UD2x18 number can have.
uint64 constant uMAX_UD2x18 = 18_446744073709551615;
UD2x18 constant MAX_UD2x18 = UD2x18.wrap(uMAX_UD2x18);

/// @dev PI as a UD2x18 number.
UD2x18 constant PI = UD2x18.wrap(3_141592653589793238);

/// @dev The unit number, which gives the decimal precision of UD2x18.
uint256 constant uUNIT = 1e18;
UD2x18 constant UNIT = UD2x18.wrap(1e18);

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "./Casting.sol" as Casting;

/// @notice The unsigned 2.18-decimal fixed-point number representation, which can have up to 2 digits and up to 18
/// decimals. The values of this are bound by the minimum and the maximum values permitted by the underlying Solidity
/// type uint64. This is useful when end users want to use uint64 to save gas, e.g. with tight variable packing in contract
/// storage.
type UD2x18 is uint64;

/*//////////////////////////////////////////////////////////////////////////
                                    CASTING
//////////////////////////////////////////////////////////////////////////*/

using {
    Casting.intoSD1x18,
    Casting.intoSD59x18,
    Casting.intoUD60x18,
    Casting.intoUint256,
    Casting.intoUint128,
    Casting.intoUint40,
    Casting.unwrap
} for UD2x18 global;

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol)

pragma solidity ^0.8.0;

import "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC721.sol)

pragma solidity ^0.8.0;

import "../token/ERC721/IERC721.sol";

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { IAdminable } from "../interfaces/IAdminable.sol";
import { Errors } from "../libraries/Errors.sol";

/// @title Adminable
/// @notice See the documentation in {IAdminable}.
abstract contract Adminable is IAdminable {
    /*//////////////////////////////////////////////////////////////////////////
                                       STORAGE
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc IAdminable
    address public override admin;

    /*//////////////////////////////////////////////////////////////////////////
                                      MODIFIERS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Reverts if called by any account other than the admin.
    modifier onlyAdmin() {
        if (admin != msg.sender) {
            revert Errors.CallerNotAdmin({ admin: admin, caller: msg.sender });
        }
        _;
    }

    /*//////////////////////////////////////////////////////////////////////////
                         USER-FACING NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc IAdminable
    function transferAdmin(address newAdmin) public virtual override onlyAdmin {
        // Effects: update the admin.
        admin = newAdmin;

        // Log the transfer of the admin.
        emit IAdminable.TransferAdmin({ oldAdmin: msg.sender, newAdmin: newAdmin });
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.19;

import { Errors } from "../libraries/Errors.sol";

/// @title NoDelegateCall
/// @notice This contract implements logic to prevent delegate calls.
abstract contract NoDelegateCall {
    /// @dev The address of the original contract that was deployed.
    address private immutable ORIGINAL;

    /// @dev Sets the original contract address.
    constructor() {
        ORIGINAL = address(this);
    }

    /// @notice Prevents delegate calls.
    modifier noDelegateCall() {
        _preventDelegateCall();
        _;
    }

    /// @dev This function checks whether the current call is a delegate call, and reverts if it is.
    ///
    /// - A private function is used instead of inlining this logic in a modifier because Solidity copies modifiers into
    /// every function that uses them. The `ORIGINAL` address would get copied in every place the modifier is used,
    /// which would increase the contract size. By using a function instead, we can avoid this duplication of code
    /// and reduce the overall size of the contract.
    function _preventDelegateCall() private view {
        if (address(this) != ORIGINAL) {
            revert Errors.DelegateCall();
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "../Common.sol" as Common;
import "./Errors.sol" as Errors;
import { uMAX_SD1x18 } from "../sd1x18/Constants.sol";
import { SD1x18 } from "../sd1x18/ValueType.sol";
import { SD59x18 } from "../sd59x18/ValueType.sol";
import { UD60x18 } from "../ud60x18/ValueType.sol";
import { UD2x18 } from "./ValueType.sol";

/// @notice Casts a UD2x18 number into SD1x18.
/// - x must be less than or equal to `uMAX_SD1x18`.
function intoSD1x18(UD2x18 x) pure returns (SD1x18 result) {
    uint64 xUint = UD2x18.unwrap(x);
    if (xUint > uint64(uMAX_SD1x18)) {
        revert Errors.PRBMath_UD2x18_IntoSD1x18_Overflow(x);
    }
    result = SD1x18.wrap(int64(xUint));
}

/// @notice Casts a UD2x18 number into SD59x18.
/// @dev There is no overflow check because the domain of UD2x18 is a subset of SD59x18.
function intoSD59x18(UD2x18 x) pure returns (SD59x18 result) {
    result = SD59x18.wrap(int256(uint256(UD2x18.unwrap(x))));
}

/// @notice Casts a UD2x18 number into UD60x18.
/// @dev There is no overflow check because the domain of UD2x18 is a subset of UD60x18.
function intoUD60x18(UD2x18 x) pure returns (UD60x18 result) {
    result = UD60x18.wrap(UD2x18.unwrap(x));
}

/// @notice Casts a UD2x18 number into uint128.
/// @dev There is no overflow check because the domain of UD2x18 is a subset of uint128.
function intoUint128(UD2x18 x) pure returns (uint128 result) {
    result = uint128(UD2x18.unwrap(x));
}

/// @notice Casts a UD2x18 number into uint256.
/// @dev There is no overflow check because the domain of UD2x18 is a subset of uint256.
function intoUint256(UD2x18 x) pure returns (uint256 result) {
    result = uint256(UD2x18.unwrap(x));
}

/// @notice Casts a UD2x18 number into uint40.
/// @dev Requirements:
/// - x must be less than or equal to `MAX_UINT40`.
function intoUint40(UD2x18 x) pure returns (uint40 result) {
    uint64 xUint = UD2x18.unwrap(x);
    if (xUint > uint64(Common.MAX_UINT40)) {
        revert Errors.PRBMath_UD2x18_IntoUint40_Overflow(x);
    }
    result = uint40(xUint);
}

/// @notice Alias for {wrap}.
function ud2x18(uint64 x) pure returns (UD2x18 result) {
    result = UD2x18.wrap(x);
}

/// @notice Unwrap a UD2x18 number into uint64.
function unwrap(UD2x18 x) pure returns (uint64 result) {
    result = UD2x18.unwrap(x);
}

/// @notice Wraps a uint64 number into UD2x18.
function wrap(uint64 x) pure returns (UD2x18 result) {
    result = UD2x18.wrap(x);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { UD2x18 } from "./ValueType.sol";

/// @notice Thrown when trying to cast a UD2x18 number that doesn't fit in SD1x18.
error PRBMath_UD2x18_IntoSD1x18_Overflow(UD2x18 x);

/// @notice Thrown when trying to cast a UD2x18 number that doesn't fit in uint40.
error PRBMath_UD2x18_IntoUint40_Overflow(UD2x18 x);

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "../Common.sol" as Common;
import "./Errors.sol" as CastingErrors;
import { SD59x18 } from "../sd59x18/ValueType.sol";
import { UD2x18 } from "../ud2x18/ValueType.sol";
import { UD60x18 } from "../ud60x18/ValueType.sol";
import { SD1x18 } from "./ValueType.sol";

/// @notice Casts an SD1x18 number into SD59x18.
/// @dev There is no overflow check because the domain of SD1x18 is a subset of SD59x18.
function intoSD59x18(SD1x18 x) pure returns (SD59x18 result) {
    result = SD59x18.wrap(int256(SD1x18.unwrap(x)));
}

/// @notice Casts an SD1x18 number into UD2x18.
/// - x must be positive.
function intoUD2x18(SD1x18 x) pure returns (UD2x18 result) {
    int64 xInt = SD1x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD1x18_ToUD2x18_Underflow(x);
    }
    result = UD2x18.wrap(uint64(xInt));
}

/// @notice Casts an SD1x18 number into UD60x18.
/// @dev Requirements:
/// - x must be positive.
function intoUD60x18(SD1x18 x) pure returns (UD60x18 result) {
    int64 xInt = SD1x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD1x18_ToUD60x18_Underflow(x);
    }
    result = UD60x18.wrap(uint64(xInt));
}

/// @notice Casts an SD1x18 number into uint256.
/// @dev Requirements:
/// - x must be positive.
function intoUint256(SD1x18 x) pure returns (uint256 result) {
    int64 xInt = SD1x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD1x18_ToUint256_Underflow(x);
    }
    result = uint256(uint64(xInt));
}

/// @notice Casts an SD1x18 number into uint128.
/// @dev Requirements:
/// - x must be positive.
function intoUint128(SD1x18 x) pure returns (uint128 result) {
    int64 xInt = SD1x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD1x18_ToUint128_Underflow(x);
    }
    result = uint128(uint64(xInt));
}

/// @notice Casts an SD1x18 number into uint40.
/// @dev Requirements:
/// - x must be positive.
/// - x must be less than or equal to `MAX_UINT40`.
function intoUint40(SD1x18 x) pure returns (uint40 result) {
    int64 xInt = SD1x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD1x18_ToUint40_Underflow(x);
    }
    if (xInt > int64(uint64(Common.MAX_UINT40))) {
        revert CastingErrors.PRBMath_SD1x18_ToUint40_Overflow(x);
    }
    result = uint40(uint64(xInt));
}

/// @notice Alias for {wrap}.
function sd1x18(int64 x) pure returns (SD1x18 result) {
    result = SD1x18.wrap(x);
}

/// @notice Unwraps an SD1x18 number into int64.
function unwrap(SD1x18 x) pure returns (int64 result) {
    result = SD1x18.unwrap(x);
}

/// @notice Wraps an int64 number into SD1x18.
function wrap(int64 x) pure returns (SD1x18 result) {
    result = SD1x18.wrap(x);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "./Errors.sol" as CastingErrors;
import { MAX_UINT128, MAX_UINT40 } from "../Common.sol";
import { uMAX_SD1x18, uMIN_SD1x18 } from "../sd1x18/Constants.sol";
import { SD1x18 } from "../sd1x18/ValueType.sol";
import { uMAX_UD2x18 } from "../ud2x18/Constants.sol";
import { UD2x18 } from "../ud2x18/ValueType.sol";
import { UD60x18 } from "../ud60x18/ValueType.sol";
import { SD59x18 } from "./ValueType.sol";

/// @notice Casts an SD59x18 number into int256.
/// @dev This is basically a functional alias for {unwrap}.
function intoInt256(SD59x18 x) pure returns (int256 result) {
    result = SD59x18.unwrap(x);
}

/// @notice Casts an SD59x18 number into SD1x18.
/// @dev Requirements:
/// - x must be greater than or equal to `uMIN_SD1x18`.
/// - x must be less than or equal to `uMAX_SD1x18`.
function intoSD1x18(SD59x18 x) pure returns (SD1x18 result) {
    int256 xInt = SD59x18.unwrap(x);
    if (xInt < uMIN_SD1x18) {
        revert CastingErrors.PRBMath_SD59x18_IntoSD1x18_Underflow(x);
    }
    if (xInt > uMAX_SD1x18) {
        revert CastingErrors.PRBMath_SD59x18_IntoSD1x18_Overflow(x);
    }
    result = SD1x18.wrap(int64(xInt));
}

/// @notice Casts an SD59x18 number into UD2x18.
/// @dev Requirements:
/// - x must be positive.
/// - x must be less than or equal to `uMAX_UD2x18`.
function intoUD2x18(SD59x18 x) pure returns (UD2x18 result) {
    int256 xInt = SD59x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD59x18_IntoUD2x18_Underflow(x);
    }
    if (xInt > int256(uint256(uMAX_UD2x18))) {
        revert CastingErrors.PRBMath_SD59x18_IntoUD2x18_Overflow(x);
    }
    result = UD2x18.wrap(uint64(uint256(xInt)));
}

/// @notice Casts an SD59x18 number into UD60x18.
/// @dev Requirements:
/// - x must be positive.
function intoUD60x18(SD59x18 x) pure returns (UD60x18 result) {
    int256 xInt = SD59x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD59x18_IntoUD60x18_Underflow(x);
    }
    result = UD60x18.wrap(uint256(xInt));
}

/// @notice Casts an SD59x18 number into uint256.
/// @dev Requirements:
/// - x must be positive.
function intoUint256(SD59x18 x) pure returns (uint256 result) {
    int256 xInt = SD59x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD59x18_IntoUint256_Underflow(x);
    }
    result = uint256(xInt);
}

/// @notice Casts an SD59x18 number into uint128.
/// @dev Requirements:
/// - x must be positive.
/// - x must be less than or equal to `uMAX_UINT128`.
function intoUint128(SD59x18 x) pure returns (uint128 result) {
    int256 xInt = SD59x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD59x18_IntoUint128_Underflow(x);
    }
    if (xInt > int256(uint256(MAX_UINT128))) {
        revert CastingErrors.PRBMath_SD59x18_IntoUint128_Overflow(x);
    }
    result = uint128(uint256(xInt));
}

/// @notice Casts an SD59x18 number into uint40.
/// @dev Requirements:
/// - x must be positive.
/// - x must be less than or equal to `MAX_UINT40`.
function intoUint40(SD59x18 x) pure returns (uint40 result) {
    int256 xInt = SD59x18.unwrap(x);
    if (xInt < 0) {
        revert CastingErrors.PRBMath_SD59x18_IntoUint40_Underflow(x);
    }
    if (xInt > int256(uint256(MAX_UINT40))) {
        revert CastingErrors.PRBMath_SD59x18_IntoUint40_Overflow(x);
    }
    result = uint40(uint256(xInt));
}

/// @notice Alias for {wrap}.
function sd(int256 x) pure returns (SD59x18 result) {
    result = SD59x18.wrap(x);
}

/// @notice Alias for {wrap}.
function sd59x18(int256 x) pure returns (SD59x18 result) {
    result = SD59x18.wrap(x);
}

/// @notice Unwraps an SD59x18 number into int256.
function unwrap(SD59x18 x) pure returns (int256 result) {
    result = SD59x18.unwrap(x);
}

/// @notice Wraps an int256 number into SD59x18.
function wrap(int256 x) pure returns (SD59x18 result) {
    result = SD59x18.wrap(x);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { wrap } from "./Casting.sol";
import { SD59x18 } from "./ValueType.sol";

/// @notice Implements the checked addition operation (+) in the SD59x18 type.
function add(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    return wrap(x.unwrap() + y.unwrap());
}

/// @notice Implements the AND (&) bitwise operation in the SD59x18 type.
function and(SD59x18 x, int256 bits) pure returns (SD59x18 result) {
    return wrap(x.unwrap() & bits);
}

/// @notice Implements the AND (&) bitwise operation in the SD59x18 type.
function and2(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    return wrap(x.unwrap() & y.unwrap());
}

/// @notice Implements the equal (=) operation in the SD59x18 type.
function eq(SD59x18 x, SD59x18 y) pure returns (bool result) {
    result = x.unwrap() == y.unwrap();
}

/// @notice Implements the greater than operation (>) in the SD59x18 type.
function gt(SD59x18 x, SD59x18 y) pure returns (bool result) {
    result = x.unwrap() > y.unwrap();
}

/// @notice Implements the greater than or equal to operation (>=) in the SD59x18 type.
function gte(SD59x18 x, SD59x18 y) pure returns (bool result) {
    result = x.unwrap() >= y.unwrap();
}

/// @notice Implements a zero comparison check function in the SD59x18 type.
function isZero(SD59x18 x) pure returns (bool result) {
    result = x.unwrap() == 0;
}

/// @notice Implements the left shift operation (<<) in the SD59x18 type.
function lshift(SD59x18 x, uint256 bits) pure returns (SD59x18 result) {
    result = wrap(x.unwrap() << bits);
}

/// @notice Implements the lower than operation (<) in the SD59x18 type.
function lt(SD59x18 x, SD59x18 y) pure returns (bool result) {
    result = x.unwrap() < y.unwrap();
}

/// @notice Implements the lower than or equal to operation (<=) in the SD59x18 type.
function lte(SD59x18 x, SD59x18 y) pure returns (bool result) {
    result = x.unwrap() <= y.unwrap();
}

/// @notice Implements the unchecked modulo operation (%) in the SD59x18 type.
function mod(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    result = wrap(x.unwrap() % y.unwrap());
}

/// @notice Implements the not equal operation (!=) in the SD59x18 type.
function neq(SD59x18 x, SD59x18 y) pure returns (bool result) {
    result = x.unwrap() != y.unwrap();
}

/// @notice Implements the NOT (~) bitwise operation in the SD59x18 type.
function not(SD59x18 x) pure returns (SD59x18 result) {
    result = wrap(~x.unwrap());
}

/// @notice Implements the OR (|) bitwise operation in the SD59x18 type.
function or(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    result = wrap(x.unwrap() | y.unwrap());
}

/// @notice Implements the right shift operation (>>) in the SD59x18 type.
function rshift(SD59x18 x, uint256 bits) pure returns (SD59x18 result) {
    result = wrap(x.unwrap() >> bits);
}

/// @notice Implements the checked subtraction operation (-) in the SD59x18 type.
function sub(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    result = wrap(x.unwrap() - y.unwrap());
}

/// @notice Implements the checked unary minus operation (-) in the SD59x18 type.
function unary(SD59x18 x) pure returns (SD59x18 result) {
    result = wrap(-x.unwrap());
}

/// @notice Implements the unchecked addition operation (+) in the SD59x18 type.
function uncheckedAdd(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    unchecked {
        result = wrap(x.unwrap() + y.unwrap());
    }
}

/// @notice Implements the unchecked subtraction operation (-) in the SD59x18 type.
function uncheckedSub(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    unchecked {
        result = wrap(x.unwrap() - y.unwrap());
    }
}

/// @notice Implements the unchecked unary minus operation (-) in the SD59x18 type.
function uncheckedUnary(SD59x18 x) pure returns (SD59x18 result) {
    unchecked {
        result = wrap(-x.unwrap());
    }
}

/// @notice Implements the XOR (^) bitwise operation in the SD59x18 type.
function xor(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    result = wrap(x.unwrap() ^ y.unwrap());
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import "../Common.sol" as Common;
import "./Errors.sol" as Errors;
import {
    uEXP_MAX_INPUT,
    uEXP2_MAX_INPUT,
    uHALF_UNIT,
    uLOG2_10,
    uLOG2_E,
    uMAX_SD59x18,
    uMAX_WHOLE_SD59x18,
    uMIN_SD59x18,
    uMIN_WHOLE_SD59x18,
    UNIT,
    uUNIT,
    uUNIT_SQUARED,
    ZERO
} from "./Constants.sol";
import { wrap } from "./Helpers.sol";
import { SD59x18 } from "./ValueType.sol";

/// @notice Calculates the absolute value of x.
///
/// @dev Requirements:
/// - x must be greater than `MIN_SD59x18`.
///
/// @param x The SD59x18 number for which to calculate the absolute value.
/// @param result The absolute value of x as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function abs(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    if (xInt == uMIN_SD59x18) {
        revert Errors.PRBMath_SD59x18_Abs_MinSD59x18();
    }
    result = xInt < 0 ? wrap(-xInt) : x;
}

/// @notice Calculates the arithmetic average of x and y.
///
/// @dev Notes:
/// - The result is rounded toward zero.
///
/// @param x The first operand as an SD59x18 number.
/// @param y The second operand as an SD59x18 number.
/// @return result The arithmetic average as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function avg(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    int256 yInt = y.unwrap();

    unchecked {
        // This operation is equivalent to `x / 2 +  y / 2`, and it can never overflow.
        int256 sum = (xInt >> 1) + (yInt >> 1);

        if (sum < 0) {
            // If at least one of x and y is odd, add 1 to the result, because shifting negative numbers to the right
            // rounds toward negative infinity. The right part is equivalent to `sum + (x % 2 == 1 || y % 2 == 1)`.
            assembly ("memory-safe") {
                result := add(sum, and(or(xInt, yInt), 1))
            }
        } else {
            // Add 1 if both x and y are odd to account for the double 0.5 remainder truncated after shifting.
            result = wrap(sum + (xInt & yInt & 1));
        }
    }
}

/// @notice Yields the smallest whole number greater than or equal to x.
///
/// @dev Optimized for fractional value inputs, because every whole value has (1e18 - 1) fractional counterparts.
/// See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions.
///
/// Requirements:
/// - x must be less than or equal to `MAX_WHOLE_SD59x18`.
///
/// @param x The SD59x18 number to ceil.
/// @param result The smallest whole number greater than or equal to x, as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function ceil(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    if (xInt > uMAX_WHOLE_SD59x18) {
        revert Errors.PRBMath_SD59x18_Ceil_Overflow(x);
    }

    int256 remainder = xInt % uUNIT;
    if (remainder == 0) {
        result = x;
    } else {
        unchecked {
            // Solidity uses C fmod style, which returns a modulus with the same sign as x.
            int256 resultInt = xInt - remainder;
            if (xInt > 0) {
                resultInt += uUNIT;
            }
            result = wrap(resultInt);
        }
    }
}

/// @notice Divides two SD59x18 numbers, returning a new SD59x18 number.
///
/// @dev This is an extension of {Common.mulDiv} for signed numbers, which works by computing the signs and the absolute
/// values separately.
///
/// Notes:
/// - Refer to the notes in {Common.mulDiv}.
/// - The result is rounded toward zero.
///
/// Requirements:
/// - Refer to the requirements in {Common.mulDiv}.
/// - None of the inputs can be `MIN_SD59x18`.
/// - The denominator must not be zero.
/// - The result must fit in SD59x18.
///
/// @param x The numerator as an SD59x18 number.
/// @param y The denominator as an SD59x18 number.
/// @param result The quotient as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function div(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    int256 yInt = y.unwrap();
    if (xInt == uMIN_SD59x18 || yInt == uMIN_SD59x18) {
        revert Errors.PRBMath_SD59x18_Div_InputTooSmall();
    }

    // Get hold of the absolute values of x and y.
    uint256 xAbs;
    uint256 yAbs;
    unchecked {
        xAbs = xInt < 0 ? uint256(-xInt) : uint256(xInt);
        yAbs = yInt < 0 ? uint256(-yInt) : uint256(yInt);
    }

    // Compute the absolute value (x*UNIT÷y). The resulting value must fit in SD59x18.
    uint256 resultAbs = Common.mulDiv(xAbs, uint256(uUNIT), yAbs);
    if (resultAbs > uint256(uMAX_SD59x18)) {
        revert Errors.PRBMath_SD59x18_Div_Overflow(x, y);
    }

    // Check if x and y have the same sign using two's complement representation. The left-most bit represents the sign (1 for
    // negative, 0 for positive or zero).
    bool sameSign = (xInt ^ yInt) > -1;

    // If the inputs have the same sign, the result should be positive. Otherwise, it should be negative.
    unchecked {
        result = wrap(sameSign ? int256(resultAbs) : -int256(resultAbs));
    }
}

/// @notice Calculates the natural exponent of x using the following formula:
///
/// $$
/// e^x = 2^{x * log_2{e}}
/// $$
///
/// @dev Notes:
/// - Refer to the notes in {exp2}.
///
/// Requirements:
/// - Refer to the requirements in {exp2}.
/// - x must be less than 133_084258667509499441.
///
/// @param x The exponent as an SD59x18 number.
/// @return result The result as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function exp(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();

    // This check prevents values greater than 192e18 from being passed to {exp2}.
    if (xInt > uEXP_MAX_INPUT) {
        revert Errors.PRBMath_SD59x18_Exp_InputTooBig(x);
    }

    unchecked {
        // Inline the fixed-point multiplication to save gas.
        int256 doubleUnitProduct = xInt * uLOG2_E;
        result = exp2(wrap(doubleUnitProduct / uUNIT));
    }
}

/// @notice Calculates the binary exponent of x using the binary fraction method using the following formula:
///
/// $$
/// 2^{-x} = \frac{1}{2^x}
/// $$
///
/// @dev See https://ethereum.stackexchange.com/q/79903/24693.
///
/// Notes:
/// - If x is less than -59_794705707972522261, the result is zero.
///
/// Requirements:
/// - x must be less than 192e18.
/// - The result must fit in SD59x18.
///
/// @param x The exponent as an SD59x18 number.
/// @return result The result as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function exp2(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    if (xInt < 0) {
        // The inverse of any number less than this is truncated to zero.
        if (xInt < -59_794705707972522261) {
            return ZERO;
        }

        unchecked {
            // Inline the fixed-point inversion to save gas.
            result = wrap(uUNIT_SQUARED / exp2(wrap(-xInt)).unwrap());
        }
    } else {
        // Numbers greater than or equal to 192e18 don't fit in the 192.64-bit format.
        if (xInt > uEXP2_MAX_INPUT) {
            revert Errors.PRBMath_SD59x18_Exp2_InputTooBig(x);
        }

        unchecked {
            // Convert x to the 192.64-bit fixed-point format.
            uint256 x_192x64 = uint256((xInt << 64) / uUNIT);

            // It is safe to cast the result to int256 due to the checks above.
            result = wrap(int256(Common.exp2(x_192x64)));
        }
    }
}

/// @notice Yields the greatest whole number less than or equal to x.
///
/// @dev Optimized for fractional value inputs, because for every whole value there are (1e18 - 1) fractional
/// counterparts. See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions.
///
/// Requirements:
/// - x must be greater than or equal to `MIN_WHOLE_SD59x18`.
///
/// @param x The SD59x18 number to floor.
/// @param result The greatest whole number less than or equal to x, as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function floor(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    if (xInt < uMIN_WHOLE_SD59x18) {
        revert Errors.PRBMath_SD59x18_Floor_Underflow(x);
    }

    int256 remainder = xInt % uUNIT;
    if (remainder == 0) {
        result = x;
    } else {
        unchecked {
            // Solidity uses C fmod style, which returns a modulus with the same sign as x.
            int256 resultInt = xInt - remainder;
            if (xInt < 0) {
                resultInt -= uUNIT;
            }
            result = wrap(resultInt);
        }
    }
}

/// @notice Yields the excess beyond the floor of x for positive numbers and the part of the number to the right.
/// of the radix point for negative numbers.
/// @dev Based on the odd function definition. https://en.wikipedia.org/wiki/Fractional_part
/// @param x The SD59x18 number to get the fractional part of.
/// @param result The fractional part of x as an SD59x18 number.
function frac(SD59x18 x) pure returns (SD59x18 result) {
    result = wrap(x.unwrap() % uUNIT);
}

/// @notice Calculates the geometric mean of x and y, i.e. $\sqrt{x * y}$.
///
/// @dev Notes:
/// - The result is rounded toward zero.
///
/// Requirements:
/// - x * y must fit in SD59x18.
/// - x * y must not be negative, since complex numbers are not supported.
///
/// @param x The first operand as an SD59x18 number.
/// @param y The second operand as an SD59x18 number.
/// @return result The result as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function gm(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    int256 yInt = y.unwrap();
    if (xInt == 0 || yInt == 0) {
        return ZERO;
    }

    unchecked {
        // Equivalent to `xy / x != y`. Checking for overflow this way is faster than letting Solidity do it.
        int256 xyInt = xInt * yInt;
        if (xyInt / xInt != yInt) {
            revert Errors.PRBMath_SD59x18_Gm_Overflow(x, y);
        }

        // The product must not be negative, since complex numbers are not supported.
        if (xyInt < 0) {
            revert Errors.PRBMath_SD59x18_Gm_NegativeProduct(x, y);
        }

        // We don't need to multiply the result by `UNIT` here because the x*y product picked up a factor of `UNIT`
        // during multiplication. See the comments in {Common.sqrt}.
        uint256 resultUint = Common.sqrt(uint256(xyInt));
        result = wrap(int256(resultUint));
    }
}

/// @notice Calculates the inverse of x.
///
/// @dev Notes:
/// - The result is rounded toward zero.
///
/// Requirements:
/// - x must not be zero.
///
/// @param x The SD59x18 number for which to calculate the inverse.
/// @return result The inverse as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function inv(SD59x18 x) pure returns (SD59x18 result) {
    result = wrap(uUNIT_SQUARED / x.unwrap());
}

/// @notice Calculates the natural logarithm of x using the following formula:
///
/// $$
/// ln{x} = log_2{x} / log_2{e}
/// $$
///
/// @dev Notes:
/// - Refer to the notes in {log2}.
/// - The precision isn't sufficiently fine-grained to return exactly `UNIT` when the input is `E`.
///
/// Requirements:
/// - Refer to the requirements in {log2}.
///
/// @param x The SD59x18 number for which to calculate the natural logarithm.
/// @return result The natural logarithm as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function ln(SD59x18 x) pure returns (SD59x18 result) {
    // Inline the fixed-point multiplication to save gas. This is overflow-safe because the maximum value that
    // {log2} can return is ~195_205294292027477728.
    result = wrap(log2(x).unwrap() * uUNIT / uLOG2_E);
}

/// @notice Calculates the common logarithm of x using the following formula:
///
/// $$
/// log_{10}{x} = log_2{x} / log_2{10}
/// $$
///
/// However, if x is an exact power of ten, a hard coded value is returned.
///
/// @dev Notes:
/// - Refer to the notes in {log2}.
///
/// Requirements:
/// - Refer to the requirements in {log2}.
///
/// @param x The SD59x18 number for which to calculate the common logarithm.
/// @return result The common logarithm as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function log10(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    if (xInt < 0) {
        revert Errors.PRBMath_SD59x18_Log_InputTooSmall(x);
    }

    // Note that the `mul` in this block is the standard multiplication operation, not {SD59x18.mul}.
    // prettier-ignore
    assembly ("memory-safe") {
        switch x
        case 1 { result := mul(uUNIT, sub(0, 18)) }
        case 10 { result := mul(uUNIT, sub(1, 18)) }
        case 100 { result := mul(uUNIT, sub(2, 18)) }
        case 1000 { result := mul(uUNIT, sub(3, 18)) }
        case 10000 { result := mul(uUNIT, sub(4, 18)) }
        case 100000 { result := mul(uUNIT, sub(5, 18)) }
        case 1000000 { result := mul(uUNIT, sub(6, 18)) }
        case 10000000 { result := mul(uUNIT, sub(7, 18)) }
        case 100000000 { result := mul(uUNIT, sub(8, 18)) }
        case 1000000000 { result := mul(uUNIT, sub(9, 18)) }
        case 10000000000 { result := mul(uUNIT, sub(10, 18)) }
        case 100000000000 { result := mul(uUNIT, sub(11, 18)) }
        case 1000000000000 { result := mul(uUNIT, sub(12, 18)) }
        case 10000000000000 { result := mul(uUNIT, sub(13, 18)) }
        case 100000000000000 { result := mul(uUNIT, sub(14, 18)) }
        case 1000000000000000 { result := mul(uUNIT, sub(15, 18)) }
        case 10000000000000000 { result := mul(uUNIT, sub(16, 18)) }
        case 100000000000000000 { result := mul(uUNIT, sub(17, 18)) }
        case 1000000000000000000 { result := 0 }
        case 10000000000000000000 { result := uUNIT }
        case 100000000000000000000 { result := mul(uUNIT, 2) }
        case 1000000000000000000000 { result := mul(uUNIT, 3) }
        case 10000000000000000000000 { result := mul(uUNIT, 4) }
        case 100000000000000000000000 { result := mul(uUNIT, 5) }
        case 1000000000000000000000000 { result := mul(uUNIT, 6) }
        case 10000000000000000000000000 { result := mul(uUNIT, 7) }
        case 100000000000000000000000000 { result := mul(uUNIT, 8) }
        case 1000000000000000000000000000 { result := mul(uUNIT, 9) }
        case 10000000000000000000000000000 { result := mul(uUNIT, 10) }
        case 100000000000000000000000000000 { result := mul(uUNIT, 11) }
        case 1000000000000000000000000000000 { result := mul(uUNIT, 12) }
        case 10000000000000000000000000000000 { result := mul(uUNIT, 13) }
        case 100000000000000000000000000000000 { result := mul(uUNIT, 14) }
        case 1000000000000000000000000000000000 { result := mul(uUNIT, 15) }
        case 10000000000000000000000000000000000 { result := mul(uUNIT, 16) }
        case 100000000000000000000000000000000000 { result := mul(uUNIT, 17) }
        case 1000000000000000000000000000000000000 { result := mul(uUNIT, 18) }
        case 10000000000000000000000000000000000000 { result := mul(uUNIT, 19) }
        case 100000000000000000000000000000000000000 { result := mul(uUNIT, 20) }
        case 1000000000000000000000000000000000000000 { result := mul(uUNIT, 21) }
        case 10000000000000000000000000000000000000000 { result := mul(uUNIT, 22) }
        case 100000000000000000000000000000000000000000 { result := mul(uUNIT, 23) }
        case 1000000000000000000000000000000000000000000 { result := mul(uUNIT, 24) }
        case 10000000000000000000000000000000000000000000 { result := mul(uUNIT, 25) }
        case 100000000000000000000000000000000000000000000 { result := mul(uUNIT, 26) }
        case 1000000000000000000000000000000000000000000000 { result := mul(uUNIT, 27) }
        case 10000000000000000000000000000000000000000000000 { result := mul(uUNIT, 28) }
        case 100000000000000000000000000000000000000000000000 { result := mul(uUNIT, 29) }
        case 1000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 30) }
        case 10000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 31) }
        case 100000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 32) }
        case 1000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 33) }
        case 10000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 34) }
        case 100000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 35) }
        case 1000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 36) }
        case 10000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 37) }
        case 100000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 38) }
        case 1000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 39) }
        case 10000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 40) }
        case 100000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 41) }
        case 1000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 42) }
        case 10000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 43) }
        case 100000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 44) }
        case 1000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 45) }
        case 10000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 46) }
        case 100000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 47) }
        case 1000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 48) }
        case 10000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 49) }
        case 100000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 50) }
        case 1000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 51) }
        case 10000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 52) }
        case 100000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 53) }
        case 1000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 54) }
        case 10000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 55) }
        case 100000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 56) }
        case 1000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 57) }
        case 10000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(uUNIT, 58) }
        default { result := uMAX_SD59x18 }
    }

    if (result.unwrap() == uMAX_SD59x18) {
        unchecked {
            // Inline the fixed-point division to save gas.
            result = wrap(log2(x).unwrap() * uUNIT / uLOG2_10);
        }
    }
}

/// @notice Calculates the binary logarithm of x using the iterative approximation algorithm:
///
/// $$
/// log_2{x} = n + log_2{y}, \text{ where } y = x*2^{-n}, \ y \in [1, 2)
/// $$
///
/// For $0 \leq x \lt 1$, the input is inverted:
///
/// $$
/// log_2{x} = -log_2{\frac{1}{x}}
/// $$
///
/// @dev See https://en.wikipedia.org/wiki/Binary_logarithm#Iterative_approximation.
///
/// Notes:
/// - Due to the lossy precision of the iterative approximation, the results are not perfectly accurate to the last decimal.
///
/// Requirements:
/// - x must be greater than zero.
///
/// @param x The SD59x18 number for which to calculate the binary logarithm.
/// @return result The binary logarithm as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function log2(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    if (xInt <= 0) {
        revert Errors.PRBMath_SD59x18_Log_InputTooSmall(x);
    }

    unchecked {
        int256 sign;
        if (xInt >= uUNIT) {
            sign = 1;
        } else {
            sign = -1;
            // Inline the fixed-point inversion to save gas.
            xInt = uUNIT_SQUARED / xInt;
        }

        // Calculate the integer part of the logarithm.
        uint256 n = Common.msb(uint256(xInt / uUNIT));

        // This is the integer part of the logarithm as an SD59x18 number. The operation can't overflow
        // because n is at most 255, `UNIT` is 1e18, and the sign is either 1 or -1.
        int256 resultInt = int256(n) * uUNIT;

        // Calculate $y = x * 2^{-n}$.
        int256 y = xInt >> n;

        // If y is the unit number, the fractional part is zero.
        if (y == uUNIT) {
            return wrap(resultInt * sign);
        }

        // Calculate the fractional part via the iterative approximation.
        // The `delta >>= 1` part is equivalent to `delta /= 2`, but shifting bits is more gas efficient.
        int256 DOUBLE_UNIT = 2e18;
        for (int256 delta = uHALF_UNIT; delta > 0; delta >>= 1) {
            y = (y * y) / uUNIT;

            // Is y^2 >= 2e18 and so in the range [2e18, 4e18)?
            if (y >= DOUBLE_UNIT) {
                // Add the 2^{-m} factor to the logarithm.
                resultInt = resultInt + delta;

                // Halve y, which corresponds to z/2 in the Wikipedia article.
                y >>= 1;
            }
        }
        resultInt *= sign;
        result = wrap(resultInt);
    }
}

/// @notice Multiplies two SD59x18 numbers together, returning a new SD59x18 number.
///
/// @dev Notes:
/// - Refer to the notes in {Common.mulDiv18}.
///
/// Requirements:
/// - Refer to the requirements in {Common.mulDiv18}.
/// - None of the inputs can be `MIN_SD59x18`.
/// - The result must fit in SD59x18.
///
/// @param x The multiplicand as an SD59x18 number.
/// @param y The multiplier as an SD59x18 number.
/// @return result The product as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function mul(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    int256 yInt = y.unwrap();
    if (xInt == uMIN_SD59x18 || yInt == uMIN_SD59x18) {
        revert Errors.PRBMath_SD59x18_Mul_InputTooSmall();
    }

    // Get hold of the absolute values of x and y.
    uint256 xAbs;
    uint256 yAbs;
    unchecked {
        xAbs = xInt < 0 ? uint256(-xInt) : uint256(xInt);
        yAbs = yInt < 0 ? uint256(-yInt) : uint256(yInt);
    }

    // Compute the absolute value (x*y÷UNIT). The resulting value must fit in SD59x18.
    uint256 resultAbs = Common.mulDiv18(xAbs, yAbs);
    if (resultAbs > uint256(uMAX_SD59x18)) {
        revert Errors.PRBMath_SD59x18_Mul_Overflow(x, y);
    }

    // Check if x and y have the same sign using two's complement representation. The left-most bit represents the sign (1 for
    // negative, 0 for positive or zero).
    bool sameSign = (xInt ^ yInt) > -1;

    // If the inputs have the same sign, the result should be positive. Otherwise, it should be negative.
    unchecked {
        result = wrap(sameSign ? int256(resultAbs) : -int256(resultAbs));
    }
}

/// @notice Raises x to the power of y using the following formula:
///
/// $$
/// x^y = 2^{log_2{x} * y}
/// $$
///
/// @dev Notes:
/// - Refer to the notes in {exp2}, {log2}, and {mul}.
/// - Returns `UNIT` for 0^0.
///
/// Requirements:
/// - Refer to the requirements in {exp2}, {log2}, and {mul}.
///
/// @param x The base as an SD59x18 number.
/// @param y Exponent to raise x to, as an SD59x18 number
/// @return result x raised to power y, as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function pow(SD59x18 x, SD59x18 y) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    int256 yInt = y.unwrap();

    // If both x and y are zero, the result is `UNIT`. If just x is zero, the result is always zero.
    if (xInt == 0) {
        return yInt == 0 ? UNIT : ZERO;
    }
    // If x is `UNIT`, the result is always `UNIT`.
    else if (xInt == uUNIT) {
        return UNIT;
    }

    // If y is zero, the result is always `UNIT`.
    if (yInt == 0) {
        return UNIT;
    }
    // If y is `UNIT`, the result is always x.
    else if (yInt == uUNIT) {
        return x;
    }

    // Calculate the result using the formula.
    result = exp2(mul(log2(x), y));
}

/// @notice Raises x (an SD59x18 number) to the power y (an unsigned basic integer) using the well-known
/// algorithm "exponentiation by squaring".
///
/// @dev See https://en.wikipedia.org/wiki/Exponentiation_by_squaring.
///
/// Notes:
/// - Refer to the notes in {Common.mulDiv18}.
/// - Returns `UNIT` for 0^0.
///
/// Requirements:
/// - Refer to the requirements in {abs} and {Common.mulDiv18}.
/// - The result must fit in SD59x18.
///
/// @param x The base as an SD59x18 number.
/// @param y The exponent as a uint256.
/// @return result The result as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function powu(SD59x18 x, uint256 y) pure returns (SD59x18 result) {
    uint256 xAbs = uint256(abs(x).unwrap());

    // Calculate the first iteration of the loop in advance.
    uint256 resultAbs = y & 1 > 0 ? xAbs : uint256(uUNIT);

    // Equivalent to `for(y /= 2; y > 0; y /= 2)`.
    uint256 yAux = y;
    for (yAux >>= 1; yAux > 0; yAux >>= 1) {
        xAbs = Common.mulDiv18(xAbs, xAbs);

        // Equivalent to `y % 2 == 1`.
        if (yAux & 1 > 0) {
            resultAbs = Common.mulDiv18(resultAbs, xAbs);
        }
    }

    // The result must fit in SD59x18.
    if (resultAbs > uint256(uMAX_SD59x18)) {
        revert Errors.PRBMath_SD59x18_Powu_Overflow(x, y);
    }

    unchecked {
        // Is the base negative and the exponent odd? If yes, the result should be negative.
        int256 resultInt = int256(resultAbs);
        bool isNegative = x.unwrap() < 0 && y & 1 == 1;
        if (isNegative) {
            resultInt = -resultInt;
        }
        result = wrap(resultInt);
    }
}

/// @notice Calculates the square root of x using the Babylonian method.
///
/// @dev See https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method.
///
/// Notes:
/// - Only the positive root is returned.
/// - The result is rounded toward zero.
///
/// Requirements:
/// - x cannot be negative, since complex numbers are not supported.
/// - x must be less than `MAX_SD59x18 / UNIT`.
///
/// @param x The SD59x18 number for which to calculate the square root.
/// @return result The result as an SD59x18 number.
/// @custom:smtchecker abstract-function-nondet
function sqrt(SD59x18 x) pure returns (SD59x18 result) {
    int256 xInt = x.unwrap();
    if (xInt < 0) {
        revert Errors.PRBMath_SD59x18_Sqrt_NegativeInput(x);
    }
    if (xInt > uMAX_SD59x18 / uUNIT) {
        revert Errors.PRBMath_SD59x18_Sqrt_Overflow(x);
    }

    unchecked {
        // Multiply x by `UNIT` to account for the factor of `UNIT` picked up when multiplying two SD59x18 numbers.
        // In this case, the two numbers are both the square root.
        uint256 resultUint = Common.sqrt(uint256(xInt * uUNIT));
        result = wrap(int256(resultUint));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { SD1x18 } from "./ValueType.sol";

/// @notice Thrown when trying to cast a SD1x18 number that doesn't fit in UD2x18.
error PRBMath_SD1x18_ToUD2x18_Underflow(SD1x18 x);

/// @notice Thrown when trying to cast a SD1x18 number that doesn't fit in UD60x18.
error PRBMath_SD1x18_ToUD60x18_Underflow(SD1x18 x);

/// @notice Thrown when trying to cast a SD1x18 number that doesn't fit in uint128.
error PRBMath_SD1x18_ToUint128_Underflow(SD1x18 x);

/// @notice Thrown when trying to cast a SD1x18 number that doesn't fit in uint256.
error PRBMath_SD1x18_ToUint256_Underflow(SD1x18 x);

/// @notice Thrown when trying to cast a SD1x18 number that doesn't fit in uint40.
error PRBMath_SD1x18_ToUint40_Overflow(SD1x18 x);

/// @notice Thrown when trying to cast a SD1x18 number that doesn't fit in uint40.
error PRBMath_SD1x18_ToUint40_Underflow(SD1x18 x);

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.19;

import { SD59x18 } from "./ValueType.sol";

/// @notice Thrown when taking the absolute value of `MIN_SD59x18`.
error PRBMath_SD59x18_Abs_MinSD59x18();

/// @notice Thrown when ceiling a number overflows SD59x18.
error PRBMath_SD59x18_Ceil_Overflow(SD59x18 x);

/// @notice Thrown when converting a basic integer to the fixed-point format overflows SD59x18.
error PRBMath_SD59x18_Convert_Overflow(int256 x);

/// @notice Thrown when converting a basic integer to the fixed-point format underflows SD59x18.
error PRBMath_SD59x18_Convert_Underflow(int256 x);

/// @notice Thrown when dividing two numbers and one of them is `MIN_SD59x18`.
error PRBMath_SD59x18_Div_InputTooSmall();

/// @notice Thrown when dividing two numbers and one of the intermediary unsigned results overflows SD59x18.
error PRBMath_SD59x18_Div_Overflow(SD59x18 x, SD59x18 y);

/// @notice Thrown when taking the natural exponent of a base greater than 133_084258667509499441.
error PRBMath_SD59x18_Exp_InputTooBig(SD59x18 x);

/// @notice Thrown when taking the binary exponent of a base greater than 192e18.
error PRBMath_SD59x18_Exp2_InputTooBig(SD59x18 x);

/// @notice Thrown when flooring a number underflows SD59x18.
error PRBMath_SD59x18_Floor_Underflow(SD59x18 x);

/// @notice Thrown when taking the geometric mean of two numbers and their product is negative.
error PRBMath_SD59x18_Gm_NegativeProduct(SD59x18 x, SD59x18 y);

/// @notice Thrown when taking the geometric mean of two numbers and multiplying them overflows SD59x18.
error PRBMath_SD59x18_Gm_Overflow(SD59x18 x, SD59x18 y);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in SD1x18.
error PRBMath_SD59x18_IntoSD1x18_Overflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in SD1x18.
error PRBMath_SD59x18_IntoSD1x18_Underflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in UD2x18.
error PRBMath_SD59x18_IntoUD2x18_Overflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in UD2x18.
error PRBMath_SD59x18_IntoUD2x18_Underflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in UD60x18.
error PRBMath_SD59x18_IntoUD60x18_Underflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in uint128.
error PRBMath_SD59x18_IntoUint128_Overflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in uint128.
error PRBMath_SD59x18_IntoUint128_Underflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in uint256.
error PRBMath_SD59x18_IntoUint256_Underflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in uint40.
error PRBMath_SD59x18_IntoUint40_Overflow(SD59x18 x);

/// @notice Thrown when trying to cast a UD60x18 number that doesn't fit in uint40.
error PRBMath_SD59x18_IntoUint40_Underflow(SD59x18 x);

/// @notice Thrown when taking the logarithm of a number less than or equal to zero.
error PRBMath_SD59x18_Log_InputTooSmall(SD59x18 x);

/// @notice Thrown when multiplying two numbers and one of the inputs is `MIN_SD59x18`.
error PRBMath_SD59x18_Mul_InputTooSmall();

/// @notice Thrown when multiplying two numbers and the intermediary absolute result overflows SD59x18.
error PRBMath_SD59x18_Mul_Overflow(SD59x18 x, SD59x18 y);

/// @notice Thrown when raising a number to a power and the intermediary absolute result overflows SD59x18.
error PRBMath_SD59x18_Powu_Overflow(SD59x18 x, uint256 y);

/// @notice Thrown when taking the square root of a negative number.
error PRBMath_SD59x18_Sqrt_NegativeInput(SD59x18 x);

/// @notice Thrown when the calculating the square root overflows SD59x18.
error PRBMath_SD59x18_Sqrt_Overflow(SD59x18 x);

{
  "remappings": [
    "@openzeppelin/contracts/=node_modules/@openzeppelin/contracts/",
    "@prb/math/=node_modules/@prb/math/",
    "@prb/test/=node_modules/@prb/test/",
    "forge-std/=node_modules/forge-std/",
    "solady/=node_modules/solady/",
    "solarray/=node_modules/solarray/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": true,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ISablierV2Comptroller","name":"newComptroller","type":"address"}],"name":"setComptroller","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract ISablierV2NFTDescriptor","name":"newNFTDescriptor","type":"address"}],"name":"setNFTDescriptor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"statusOf","outputs":[{"internalType":"enum Lockup.Status","name":"status","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"streamedAmountOf","outputs":[{"internalType":"uint128","name":"streamedAmount","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"uri","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newAdmin","type":"address"}],"name":"transferAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"wasCanceled","outputs":[{"internalType":"bool","name":"result","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint128","name":"amount","type":"uint128"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"withdrawMax","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"},{"internalType":"address","name":"newRecipient","type":"address"}],"name":"withdrawMaxAndTransfer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"streamIds","type":"uint256[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint128[]","name":"amounts","type":"uint128[]"}],"name":"withdrawMultiple","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"withdrawableAmountOf","outputs":[{"internalType":"uint128","name":"withdrawableAmount","type":"uint128"}],"stateMutability":"view","type":"function"}]

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00000000000000000000000079fb3e81aac012c08501f41296ccc145a1e15844000000000000000000000000c3be6bffaeab7b297c03383b4254aa3af2b9a5ba00000000000000000000000023ed5da55af4286c0de55facb414dee2e317f4cb

-----Decoded View---------------
Arg [0] : initialAdmin (address): 0x79Fb3e81aAc012c08501f41296CCC145a1E15844
Arg [1] : initialComptroller (address): 0xC3Be6BffAeab7B297c03383B4254aa3Af2b9a5BA
Arg [2] : initialNFTDescriptor (address): 0x23eD5DA55AF4286c0dE55fAcb414dEE2e317F4CB

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000079fb3e81aac012c08501f41296ccc145a1e15844
Arg [1] : 000000000000000000000000c3be6bffaeab7b297c03383b4254aa3af2b9a5ba
Arg [2] : 00000000000000000000000023ed5da55af4286c0de55facb414dee2e317f4cb