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// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2023
pragma solidity ^0.8.17;

import {IAdapter, AdapterType} from "../../interfaces/IAdapter.sol";

import {N_COINS} from "../../integrations/curve/ICurvePool_2.sol";
import {ICurveV1_2AssetsAdapter} from "../../interfaces/curve/ICurveV1_2AssetsAdapter.sol";
import {CurveV1AdapterBase} from "./CurveV1_Base.sol";

/// @title Curve V1 2 assets adapter
/// @notice Implements logic allowing to interact with Curve pools with 2 assets
contract CurveV1Adapter2Assets is CurveV1AdapterBase, ICurveV1_2AssetsAdapter {
    function _gearboxAdapterType() external pure virtual override(CurveV1AdapterBase, IAdapter) returns (AdapterType) {
        return AdapterType.CURVE_V1_2ASSETS;
    }

    /// @notice Constructor
    /// @param _creditManager Credit manager address
    /// @param _curvePool Target Curve pool address
    /// @param _lp_token Pool LP token address
    /// @param _metapoolBase Base pool address (for metapools only) or zero address
    constructor(address _creditManager, address _curvePool, address _lp_token, address _metapoolBase)
        CurveV1AdapterBase(_creditManager, _curvePool, _lp_token, _metapoolBase, N_COINS)
    {}

    /// @inheritdoc ICurveV1_2AssetsAdapter
    function add_liquidity(uint256[N_COINS] calldata amounts, uint256) external creditFacadeOnly {
        _add_liquidity(amounts[0] > 1, amounts[1] > 1, false, false); // F: [ACV1_2-4, ACV1S-1]
    }

    /// @inheritdoc ICurveV1_2AssetsAdapter
    function remove_liquidity(uint256, uint256[N_COINS] calldata) external virtual creditFacadeOnly {
        _remove_liquidity(); // F: [ACV1_2-5]
    }

    /// @inheritdoc ICurveV1_2AssetsAdapter
    function remove_liquidity_imbalance(uint256[N_COINS] calldata amounts, uint256)
        external
        virtual
        override
        creditFacadeOnly
    {
        _remove_liquidity_imbalance(amounts[0] > 1, amounts[1] > 1, false, false); // F: [ACV1_2-6]
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { IACL } from "../interfaces/IACL.sol";
import { IAdapter } from "../interfaces/adapters/IAdapter.sol";
import { IAddressProvider } from "../interfaces/IAddressProvider.sol";
import { ICreditManagerV2 } from "../interfaces/ICreditManagerV2.sol";
import { IPoolService } from "../interfaces/IPoolService.sol";
import { ZeroAddressException } from "../interfaces/IErrors.sol";

/// @title Abstract adapter
/// @dev Inheriting adapters MUST use provided internal functions to perform all operations with credit accounts
abstract contract AbstractAdapter is IAdapter {
    /// @notice Credit Manager the adapter is connected to
    ICreditManagerV2 public immutable override creditManager;

    /// @notice Address provider
    IAddressProvider public immutable override addressProvider;

    /// @notice Address of the contract the adapter is interacting with
    address public immutable override targetContract;

    /// @notice ACL contract to check rights
    IACL public immutable override _acl;

    /// @notice Constructor
    /// @param _creditManager Credit Manager to connect this adapter to
    /// @param _targetContract Address of the contract this adapter should interact with
    constructor(address _creditManager, address _targetContract) {
        if (_creditManager == address(0) || _targetContract == address(0)) {
            revert ZeroAddressException(); // F: [AA-2]
        }

        creditManager = ICreditManagerV2(_creditManager); // F: [AA-1]
        addressProvider = IAddressProvider(
            IPoolService(creditManager.pool()).addressProvider()
        ); // F: [AA-1]
        targetContract = _targetContract; // F: [AA-1]

        _acl = IACL(addressProvider.getACL()); // F: [AA-1]
    }

    /// @notice Reverts if caller of the function is not configurator
    modifier configuratorOnly() {
        if (!_acl.isConfigurator(msg.sender))
            revert CallerNotConfiguratorException(); // F: [AA-16]
        _;
    }

    /// @notice Reverts if caller of the function is not the Credit Facade
    /// @dev Adapter functions are only allowed to be called from within the multicall
    ///      Since at this point Credit Account is owned by the Credit Facade, all functions
    ///      of inheriting adapters that perform actions on account MUST have this modifier
    modifier creditFacadeOnly() {
        if (msg.sender != _creditFacade()) {
            revert CreditFacadeOnlyException(); // F: [AA-5]
        }
        _;
    }

    /// @dev Returns the Credit Facade connected to the Credit Manager
    function _creditFacade() internal view returns (address) {
        return creditManager.creditFacade(); // F: [AA-3]
    }

    /// @dev Returns the Credit Account currently owned by the Credit Facade
    /// @dev Inheriting adapters MUST use this function to find the account address
    function _creditAccount() internal view returns (address) {
        return creditManager.getCreditAccountOrRevert(_creditFacade()); // F: [AA-4]
    }

    /// @dev Returns collateral token mask of given token in the Credit Manager
    /// @param token Token to get the mask for
    /// @return tokenMask Collateral token mask
    /// @dev Reverts if token is not registered as collateral token in the Credit Manager
    function _getMaskOrRevert(address token)
        internal
        view
        returns (uint256 tokenMask)
    {
        tokenMask = creditManager.tokenMasksMap(token); // F: [AA-6]
        if (tokenMask == 0) {
            revert TokenNotAllowedException(); // F: [AA-6]
        }
    }

    /// @dev Approves the target contract to spend given token from the Credit Account
    /// @param token Token to be approved
    /// @param amount Amount to be approved
    /// @dev Reverts if token is not registered as collateral token in the Credit Manager
    function _approveToken(address token, uint256 amount) internal {
        creditManager.approveCreditAccount(
            _creditFacade(),
            targetContract,
            token,
            amount
        ); // F: [AA-7, AA-8]
    }

    /// @dev Enables a token in the Credit Account
    /// @param token Address of the token to enable
    /// @dev Reverts if token is not registered as collateral token in the Credit Manager
    function _enableToken(address token) internal {
        creditManager.checkAndEnableToken(_creditAccount(), token); // F: [AA-7, AA-9]
    }

    /// @dev Disables a token in the Credit Account
    /// @param token Address of the token to disable
    function _disableToken(address token) internal {
        creditManager.disableToken(_creditAccount(), token); // F: [AA-7, AA-10]
    }

    /// @dev Changes enabled tokens in the Credit Account
    /// @param tokensToEnable Bitmask of tokens that should be enabled
    /// @param tokensToDisable Bitmask of tokens that should be disabled
    /// @dev This function might be useful for adapters that work with limited set of tokens, whose masks can be
    ///      determined in the adapter constructor, thus saving gas by avoiding querying them during execution
    ///      and combining multiple enable/disable operations into a single one
    function _changeEnabledTokens(
        uint256 tokensToEnable,
        uint256 tokensToDisable
    ) internal {
        address creditAccount = _creditAccount(); // F: [AA-7]
        unchecked {
            uint256 tokensToChange = tokensToEnable ^ tokensToDisable;
            address token;
            uint256 mask = 1;
            while (mask <= tokensToChange) {
                if (tokensToChange & mask != 0) {
                    (token, ) = creditManager.collateralTokensByMask(mask);
                    if (tokensToEnable & mask != 0) {
                        creditManager.checkAndEnableToken(creditAccount, token); // F: [AA-11]
                    } else {
                        creditManager.disableToken(creditAccount, token); // F: [AA-11]
                    }
                }
                if (mask == 1 << 255) break; // F: [AA-11A]
                mask <<= 1;
            }
        }
    }

    /// @dev Executes an arbitrary call from the Credit Account to the target contract
    /// @param callData Data to call the target contract with
    /// @return result Call output
    function _execute(bytes memory callData)
        internal
        returns (bytes memory result)
    {
        return
            creditManager.executeOrder(
                _creditFacade(),
                targetContract,
                callData
            ); // F: [AA-7, AA-12]
    }

    /// @dev Executes a swap operation on the target contract from the Credit Account
    ///      without explicit approval to spend `tokenIn`
    /// @param tokenIn The token that the call is expected to spend
    /// @param tokenOut The token that the call is expected to produce
    /// @param callData Data to call the target contract with
    /// @param disableTokenIn Whether the input token should be disabled afterwards
    ///        (for operations that spend the entire balance)
    /// @return result Call output
    /// @dev Reverts if tokenIn or tokenOut are not registered as collateral in the Credit Manager
    function _executeSwapNoApprove(
        address tokenIn,
        address tokenOut,
        bytes memory callData,
        bool disableTokenIn
    ) internal returns (bytes memory result) {
        _getMaskOrRevert(tokenIn); // F: [AA-15]
        result = _executeSwap(tokenIn, tokenOut, callData, disableTokenIn); // F: [AA-7, AA-13]
    }

    /// @dev Executes a swap operation on the target contract from the Credit Account
    ///      with maximal `tokenIn` allowance, and then sets the allowance to 1
    /// @param tokenIn The token that the call is expected to spend
    /// @param tokenOut The token that the call is expected to produce
    /// @param callData Data to call the target contract with
    /// @param disableTokenIn Whether the input token should be disabled afterwards
    ///        (for operations that spend the entire balance)
    /// @return result Call output
    /// @dev Reverts if tokenIn or tokenOut are not registered as collateral in the Credit Manager
    function _executeSwapSafeApprove(
        address tokenIn,
        address tokenOut,
        bytes memory callData,
        bool disableTokenIn
    ) internal returns (bytes memory result) {
        _approveToken(tokenIn, type(uint256).max); // F: [AA-14, AA-15]
        result = _executeSwap(tokenIn, tokenOut, callData, disableTokenIn); // F: [AA-7, AA-14]
        _approveToken(tokenIn, 1); // F: [AA-14]
    }

    /// @dev Implementation of `_executeSwap...` operations
    /// @dev Kept private as only the internal wrappers are intended to be used
    ///      by inheritors
    function _executeSwap(
        address tokenIn,
        address tokenOut,
        bytes memory callData,
        bool disableTokenIn
    ) private returns (bytes memory result) {
        result = _execute(callData); // F: [AA-13, AA-14]
        if (disableTokenIn) {
            _disableToken(tokenIn); // F: [AA-13, AA-14]
        }
        _enableToken(tokenOut); // F: [AA-13, AA-14, AA-15]
    }
}

// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

/// @title Claimable
/// @dev Implements logic for a two-step ownership transfer on top of Ownable
contract Claimable is Ownable {
    /// @dev The new owner that has not claimed ownership yet
    address public pendingOwner;

    /// @dev A modifier that restricts the function to the pending owner only
    modifier onlyPendingOwner() {
        if (msg.sender != pendingOwner) {
            revert("Claimable: Sender is not pending owner");
        }
        _;
    }

    /// @dev Sets pending owner to the new owner, but does not
    /// transfer ownership yet
    /// @param newOwner The address to become the future owner
    function transferOwnership(address newOwner) public override onlyOwner {
        require(
            newOwner != address(0),
            "Claimable: new owner is the zero address"
        );
        pendingOwner = newOwner;
    }

    /// @dev Used by the pending owner to claim ownership after transferOwnership
    function claimOwnership() external onlyPendingOwner {
        _transferOwnership(pendingOwner);
        pendingOwner = address(0);
    }
}

// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { IAddressProvider } from "../interfaces/IAddressProvider.sol";
import { Claimable } from "./access/Claimable.sol";
import { Errors } from "../libraries/Errors.sol";

// Repositories & services
bytes32 constant CONTRACTS_REGISTER = "CONTRACTS_REGISTER";
bytes32 constant ACL = "ACL";
bytes32 constant PRICE_ORACLE = "PRICE_ORACLE";
bytes32 constant ACCOUNT_FACTORY = "ACCOUNT_FACTORY";
bytes32 constant DATA_COMPRESSOR = "DATA_COMPRESSOR";
bytes32 constant TREASURY_CONTRACT = "TREASURY_CONTRACT";
bytes32 constant GEAR_TOKEN = "GEAR_TOKEN";
bytes32 constant WETH_TOKEN = "WETH_TOKEN";
bytes32 constant WETH_GATEWAY = "WETH_GATEWAY";
bytes32 constant LEVERAGED_ACTIONS = "LEVERAGED_ACTIONS";

/// @title AddressRepository
/// @notice Stores addresses of deployed contracts
contract AddressProvider is Claimable, IAddressProvider {
    // Mapping from contract keys to respective addresses
    mapping(bytes32 => address) public addresses;

    // Contract version
    uint256 public constant version = 2;

    constructor() {
        // @dev Emits first event for contract discovery
        emit AddressSet("ADDRESS_PROVIDER", address(this));
    }

    /// @return Address of ACL contract
    function getACL() external view returns (address) {
        return _getAddress(ACL); // F:[AP-3]
    }

    /// @dev Sets address of ACL contract
    /// @param _address Address of ACL contract
    function setACL(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(ACL, _address); // F:[AP-3]
    }

    /// @return Address of ContractsRegister
    function getContractsRegister() external view returns (address) {
        return _getAddress(CONTRACTS_REGISTER); // F:[AP-4]
    }

    /// @dev Sets address of ContractsRegister
    /// @param _address Address of ContractsRegister
    function setContractsRegister(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(CONTRACTS_REGISTER, _address); // F:[AP-4]
    }

    /// @return Address of PriceOracle
    function getPriceOracle() external view override returns (address) {
        return _getAddress(PRICE_ORACLE); // F:[AP-5]
    }

    /// @dev Sets address of PriceOracle
    /// @param _address Address of PriceOracle
    function setPriceOracle(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(PRICE_ORACLE, _address); // F:[AP-5]
    }

    /// @return Address of AccountFactory
    function getAccountFactory() external view returns (address) {
        return _getAddress(ACCOUNT_FACTORY); // F:[AP-6]
    }

    /// @dev Sets address of AccountFactory
    /// @param _address Address of AccountFactory
    function setAccountFactory(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(ACCOUNT_FACTORY, _address); // F:[AP-6]
    }

    /// @return Address of DataCompressor
    function getDataCompressor() external view override returns (address) {
        return _getAddress(DATA_COMPRESSOR); // F:[AP-7]
    }

    /// @dev Sets address of AccountFactory
    /// @param _address Address of AccountFactory
    function setDataCompressor(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(DATA_COMPRESSOR, _address); // F:[AP-7]
    }

    /// @return Address of Treasury contract
    function getTreasuryContract() external view returns (address) {
        return _getAddress(TREASURY_CONTRACT); // F:[AP-8]
    }

    /// @dev Sets address of Treasury Contract
    /// @param _address Address of Treasury Contract
    function setTreasuryContract(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(TREASURY_CONTRACT, _address); // F:[AP-8]
    }

    /// @return Address of GEAR token
    function getGearToken() external view override returns (address) {
        return _getAddress(GEAR_TOKEN); // F:[AP-9]
    }

    /// @dev Sets address of GEAR token
    /// @param _address Address of GEAR token
    function setGearToken(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(GEAR_TOKEN, _address); // F:[AP-9]
    }

    /// @return Address of WETH token
    function getWethToken() external view override returns (address) {
        return _getAddress(WETH_TOKEN); // F:[AP-10]
    }

    /// @dev Sets address of WETH token
    /// @param _address Address of WETH token
    function setWethToken(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(WETH_TOKEN, _address); // F:[AP-10]
    }

    /// @return Address of WETH token
    function getWETHGateway() external view override returns (address) {
        return _getAddress(WETH_GATEWAY); // F:[AP-11]
    }

    /// @dev Sets address of WETH token
    /// @param _address Address of WETH token
    function setWETHGateway(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(WETH_GATEWAY, _address); // F:[AP-11]
    }

    /// @return Address of PathFinder
    function getLeveragedActions() external view returns (address) {
        return _getAddress(LEVERAGED_ACTIONS); // T:[AP-7]
    }

    /// @dev Sets address of  PathFinder
    /// @param _address Address of  PathFinder
    function setLeveragedActions(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(LEVERAGED_ACTIONS, _address); // T:[AP-7]
    }

    /// @return Address of key, reverts if the key doesn't exist
    function _getAddress(bytes32 key) internal view returns (address) {
        address result = addresses[key];
        require(result != address(0), Errors.AS_ADDRESS_NOT_FOUND); // F:[AP-1]
        return result; // F:[AP-3, 4, 5, 6, 7, 8, 9, 10, 11]
    }

    /// @dev Sets address to map by its key
    /// @param key Key in string format
    /// @param value Address
    function _setAddress(bytes32 key, address value) internal {
        addresses[key] = value; // F:[AP-3, 4, 5, 6, 7, 8, 9, 10, 11]
        emit AddressSet(key, value); // F:[AP-2]
    }
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { IACL } from "../IACL.sol";
import { IAddressProvider } from "../IAddressProvider.sol";
import { ICreditManagerV2 } from "../ICreditManagerV2.sol";

// NOTE: new values must always be added at the end of the enum

enum AdapterType {
    ABSTRACT,
    UNISWAP_V2_ROUTER,
    UNISWAP_V3_ROUTER,
    CURVE_V1_EXCHANGE_ONLY,
    YEARN_V2,
    CURVE_V1_2ASSETS,
    CURVE_V1_3ASSETS,
    CURVE_V1_4ASSETS,
    CURVE_V1_STECRV_POOL,
    CURVE_V1_WRAPPER,
    CONVEX_V1_BASE_REWARD_POOL,
    CONVEX_V1_BOOSTER,
    CONVEX_V1_CLAIM_ZAP,
    LIDO_V1,
    UNIVERSAL,
    LIDO_WSTETH_V1,
    BALANCER_VAULT,
    AAVE_V2_LENDING_POOL,
    AAVE_V2_WRAPPED_ATOKEN,
    COMPOUND_V2_CERC20,
    COMPOUND_V2_CETHER
}

interface IAdapterExceptions {
    /// @notice Thrown when adapter tries to use a token that's not a collateral token of the connected Credit Manager
    error TokenNotAllowedException();

    /// @notice Thrown when caller of a `creditFacadeOnly` function is not the Credit Facade
    error CreditFacadeOnlyException();

    /// @notice Thrown when caller of a `configuratorOnly` function is not configurator
    error CallerNotConfiguratorException();
}

interface IAdapter is IAdapterExceptions {
    /// @notice Credit Manager the adapter is connected to
    function creditManager() external view returns (ICreditManagerV2);

    /// @notice Address of the contract the adapter is interacting with
    function targetContract() external view returns (address);

    /// @notice Address provider
    function addressProvider() external view returns (IAddressProvider);

    /// @notice ACL contract to check rights
    function _acl() external view returns (IACL);

    /// @notice Adapter type
    function _gearboxAdapterType() external pure returns (AdapterType);

    /// @notice Adapter version
    function _gearboxAdapterVersion() external pure returns (uint16);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;
import { IVersion } from "./IVersion.sol";

interface IACLExceptions {
    /// @dev Thrown when attempting to delete an address from a set that is not a pausable admin
    error AddressNotPausableAdminException(address addr);

    /// @dev Thrown when attempting to delete an address from a set that is not a unpausable admin
    error AddressNotUnpausableAdminException(address addr);
}

interface IACLEvents {
    /// @dev Emits when a new admin is added that can pause contracts
    event PausableAdminAdded(address indexed newAdmin);

    /// @dev Emits when a Pausable admin is removed
    event PausableAdminRemoved(address indexed admin);

    /// @dev Emits when a new admin is added that can unpause contracts
    event UnpausableAdminAdded(address indexed newAdmin);

    /// @dev Emits when an Unpausable admin is removed
    event UnpausableAdminRemoved(address indexed admin);
}

/// @title ACL interface
interface IACL is IACLEvents, IACLExceptions, IVersion {
    /// @dev Returns true if the address is a pausable admin and false if not
    /// @param addr Address to check
    function isPausableAdmin(address addr) external view returns (bool);

    /// @dev Returns true if the address is unpausable admin and false if not
    /// @param addr Address to check
    function isUnpausableAdmin(address addr) external view returns (bool);

    /// @dev Returns true if an address has configurator rights
    /// @param account Address to check
    function isConfigurator(address account) external view returns (bool);

    /// @dev Returns address of configurator
    function owner() external view returns (address);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;
import { IVersion } from "./IVersion.sol";

interface IAddressProviderEvents {
    /// @dev Emits when an address is set for a contract role
    event AddressSet(bytes32 indexed service, address indexed newAddress);
}

/// @title Optimised for front-end Address Provider interface
interface IAddressProvider is IAddressProviderEvents, IVersion {
    /// @return Address of ACL contract
    function getACL() external view returns (address);

    /// @return Address of ContractsRegister
    function getContractsRegister() external view returns (address);

    /// @return Address of AccountFactory
    function getAccountFactory() external view returns (address);

    /// @return Address of DataCompressor
    function getDataCompressor() external view returns (address);

    /// @return Address of GEAR token
    function getGearToken() external view returns (address);

    /// @return Address of WETH token
    function getWethToken() external view returns (address);

    /// @return Address of WETH Gateway
    function getWETHGateway() external view returns (address);

    /// @return Address of PriceOracle
    function getPriceOracle() external view returns (address);

    /// @return Address of DAO Treasury Multisig
    function getTreasuryContract() external view returns (address);

    /// @return Address of PathFinder
    function getLeveragedActions() external view returns (address);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { IPriceOracleV2 } from "./IPriceOracle.sol";
import { IVersion } from "./IVersion.sol";

enum ClosureAction {
    CLOSE_ACCOUNT,
    LIQUIDATE_ACCOUNT,
    LIQUIDATE_EXPIRED_ACCOUNT,
    LIQUIDATE_PAUSED
}

interface ICreditManagerV2Events {
    /// @dev Emits when a call to an external contract is made through the Credit Manager
    event ExecuteOrder(address indexed borrower, address indexed target);

    /// @dev Emits when a configurator is upgraded
    event NewConfigurator(address indexed newConfigurator);
}

interface ICreditManagerV2Exceptions {
    /// @dev Thrown if an access-restricted function is called by an address that is not
    ///      the connected Credit Facade, or an allowed adapter
    error AdaptersOrCreditFacadeOnlyException();

    /// @dev Thrown if an access-restricted function is called by an address that is not
    ///      the connected Credit Facade
    error CreditFacadeOnlyException();

    /// @dev Thrown if an access-restricted function is called by an address that is not
    ///      the connected Credit Configurator
    error CreditConfiguratorOnlyException();

    /// @dev Thrown on attempting to open a Credit Account for or transfer a Credit Account
    ///      to the zero address or an address that already owns a Credit Account
    error ZeroAddressOrUserAlreadyHasAccountException();

    /// @dev Thrown on attempting to execute an order to an address that is not an allowed
    ///      target contract
    error TargetContractNotAllowedException();

    /// @dev Thrown on failing a full collateral check after an operation
    error NotEnoughCollateralException();

    /// @dev Thrown on attempting to receive a token that is not a collateral token
    ///      or was forbidden
    error TokenNotAllowedException();

    /// @dev Thrown if an attempt to approve a collateral token to a target contract failed
    error AllowanceFailedException();

    /// @dev Thrown on attempting to perform an action for an address that owns no Credit Account
    error HasNoOpenedAccountException();

    /// @dev Thrown on attempting to add a token that is already in a collateral list
    error TokenAlreadyAddedException();

    /// @dev Thrown on configurator attempting to add more than 256 collateral tokens
    error TooManyTokensException();

    /// @dev Thrown if more than the maximal number of tokens were enabled on a Credit Account,
    ///      and there are not enough unused token to disable
    error TooManyEnabledTokensException();

    /// @dev Thrown when a reentrancy into the contract is attempted
    error ReentrancyLockException();
}

/// @notice All Credit Manager functions are access-restricted and can only be called
///         by the Credit Facade or allowed adapters. Users are not allowed to
///         interact with the Credit Manager directly
interface ICreditManagerV2 is
    ICreditManagerV2Events,
    ICreditManagerV2Exceptions,
    IVersion
{
    //
    // CREDIT ACCOUNT MANAGEMENT
    //

    ///  @dev Opens credit account and borrows funds from the pool.
    /// - Takes Credit Account from the factory;
    /// - Requests the pool to lend underlying to the Credit Account
    ///
    /// @param borrowedAmount Amount to be borrowed by the Credit Account
    /// @param onBehalfOf The owner of the newly opened Credit Account
    function openCreditAccount(uint256 borrowedAmount, address onBehalfOf)
        external
        returns (address);

    ///  @dev Closes a Credit Account - covers both normal closure and liquidation
    /// - Checks whether the contract is paused, and, if so, if the payer is an emergency liquidator.
    ///   Only emergency liquidators are able to liquidate account while the CM is paused.
    ///   Emergency liquidations do not pay a liquidator premium or liquidation fees.
    /// - Calculates payments to various recipients on closure:
    ///    + Computes amountToPool, which is the amount to be sent back to the pool.
    ///      This includes the principal, interest and fees, but can't be more than
    ///      total position value
    ///    + Computes remainingFunds during liquidations - these are leftover funds
    ///      after paying the pool and the liquidator, and are sent to the borrower
    ///    + Computes protocol profit, which includes interest and liquidation fees
    ///    + Computes loss if the totalValue is less than borrow amount + interest
    /// - Checks the underlying token balance:
    ///    + if it is larger than amountToPool, then the pool is paid fully from funds on the Credit Account
    ///    + else tries to transfer the shortfall from the payer - either the borrower during closure, or liquidator during liquidation
    /// - Send assets to the "to" address, as long as they are not included into skipTokenMask
    /// - If convertWETH is true, the function converts WETH into ETH before sending
    /// - Returns the Credit Account back to factory
    ///
    /// @param borrower Borrower address
    /// @param closureActionType Whether the account is closed, liquidated or liquidated due to expiry
    /// @param totalValue Portfolio value for liqution, 0 for ordinary closure
    /// @param payer Address which would be charged if credit account has not enough funds to cover amountToPool
    /// @param to Address to which the leftover funds will be sent
    /// @param skipTokenMask Tokenmask contains 1 for tokens which needed to be skipped for sending
    /// @param convertWETH If true converts WETH to ETH
    function closeCreditAccount(
        address borrower,
        ClosureAction closureActionType,
        uint256 totalValue,
        address payer,
        address to,
        uint256 skipTokenMask,
        bool convertWETH
    ) external returns (uint256 remainingFunds);

    /// @dev Manages debt size for borrower:
    ///
    /// - Increase debt:
    ///   + Increases debt by transferring funds from the pool to the credit account
    ///   + Updates the cumulative index to keep interest the same. Since interest
    ///     is always computed dynamically as borrowedAmount * (cumulativeIndexNew / cumulativeIndexOpen - 1),
    ///     cumulativeIndexOpen needs to be updated, as the borrow amount has changed
    ///
    /// - Decrease debt:
    ///   + Repays debt partially + all interest and fees accrued thus far
    ///   + Updates cunulativeIndex to cumulativeIndex now
    ///
    /// @param creditAccount Address of the Credit Account to change debt for
    /// @param amount Amount to increase / decrease the principal by
    /// @param increase True to increase principal, false to decrease
    /// @return newBorrowedAmount The new debt principal
    function manageDebt(
        address creditAccount,
        uint256 amount,
        bool increase
    ) external returns (uint256 newBorrowedAmount);

    /// @dev Adds collateral to borrower's credit account
    /// @param payer Address of the account which will be charged to provide additional collateral
    /// @param creditAccount Address of the Credit Account
    /// @param token Collateral token to add
    /// @param amount Amount to add
    function addCollateral(
        address payer,
        address creditAccount,
        address token,
        uint256 amount
    ) external;

    /// @dev Transfers Credit Account ownership to another address
    /// @param from Address of previous owner
    /// @param to Address of new owner
    function transferAccountOwnership(address from, address to) external;

    /// @dev Requests the Credit Account to approve a collateral token to another contract.
    /// @param borrower Borrower's address
    /// @param targetContract Spender to change allowance for
    /// @param token Collateral token to approve
    /// @param amount New allowance amount
    function approveCreditAccount(
        address borrower,
        address targetContract,
        address token,
        uint256 amount
    ) external;

    /// @dev Requests a Credit Account to make a low-level call with provided data
    /// This is the intended pathway for state-changing interactions with 3rd-party protocols
    /// @param borrower Borrower's address
    /// @param targetContract Contract to be called
    /// @param data Data to pass with the call
    function executeOrder(
        address borrower,
        address targetContract,
        bytes memory data
    ) external returns (bytes memory);

    //
    // COLLATERAL VALIDITY AND ACCOUNT HEALTH CHECKS
    //

    /// @dev Enables a token on a Credit Account, including it
    /// into account health and total value calculations
    /// @param creditAccount Address of a Credit Account to enable the token for
    /// @param token Address of the token to be enabled
    function checkAndEnableToken(address creditAccount, address token) external;

    /// @dev Optimized health check for individual swap-like operations.
    /// @notice Fast health check assumes that only two tokens (input and output)
    ///         participate in the operation and computes a % change in weighted value between
    ///         inbound and outbound collateral. The cumulative negative change across several
    ///         swaps in sequence cannot be larger than feeLiquidation (a fee that the
    ///         protocol is ready to waive if needed). Since this records a % change
    ///         between just two tokens, the corresponding % change in TWV will always be smaller,
    ///         which makes this check safe.
    ///         More details at https://dev.gearbox.fi/docs/documentation/risk/fast-collateral-check#fast-check-protection
    /// @param creditAccount Address of the Credit Account
    /// @param tokenIn Address of the token spent by the swap
    /// @param tokenOut Address of the token received from the swap
    /// @param balanceInBefore Balance of tokenIn before the operation
    /// @param balanceOutBefore Balance of tokenOut before the operation
    function fastCollateralCheck(
        address creditAccount,
        address tokenIn,
        address tokenOut,
        uint256 balanceInBefore,
        uint256 balanceOutBefore
    ) external;

    /// @dev Performs a full health check on an account, summing up
    /// value of all enabled collateral tokens
    /// @param creditAccount Address of the Credit Account to check
    function fullCollateralCheck(address creditAccount) external;

    /// @dev Checks that the number of enabled tokens on a Credit Account
    ///      does not violate the maximal enabled token limit and tries
    ///      to disable unused tokens if it does
    /// @param creditAccount Account to check enabled tokens for
    function checkAndOptimizeEnabledTokens(address creditAccount) external;

    /// @dev Disables a token on a credit account
    /// @notice Usually called by adapters to disable spent tokens during a multicall,
    ///         but can also be called separately from the Credit Facade to remove
    ///         unwanted tokens
    /// @return True if token mask was change otherwise False
    function disableToken(address creditAccount, address token)
        external
        returns (bool);

    //
    // GETTERS
    //

    /// @dev Returns the address of a borrower's Credit Account, or reverts if there is none.
    /// @param borrower Borrower's address
    function getCreditAccountOrRevert(address borrower)
        external
        view
        returns (address);

    /// @dev Computes amounts that must be sent to various addresses before closing an account
    /// @param totalValue Credit Accounts total value in underlying
    /// @param closureActionType Type of account closure
    ///        * CLOSE_ACCOUNT: The account is healthy and is closed normally
    ///        * LIQUIDATE_ACCOUNT: The account is unhealthy and is being liquidated to avoid bad debt
    ///        * LIQUIDATE_EXPIRED_ACCOUNT: The account has expired and is being liquidated (lowered liquidation premium)
    ///        * LIQUIDATE_PAUSED: The account is liquidated while the system is paused due to emergency (no liquidation premium)
    /// @param borrowedAmount Credit Account's debt principal
    /// @param borrowedAmountWithInterest Credit Account's debt principal + interest
    /// @return amountToPool Amount of underlying to be sent to the pool
    /// @return remainingFunds Amount of underlying to be sent to the borrower (only applicable to liquidations)
    /// @return profit Protocol's profit from fees (if any)
    /// @return loss Protocol's loss from bad debt (if any)
    function calcClosePayments(
        uint256 totalValue,
        ClosureAction closureActionType,
        uint256 borrowedAmount,
        uint256 borrowedAmountWithInterest
    )
        external
        view
        returns (
            uint256 amountToPool,
            uint256 remainingFunds,
            uint256 profit,
            uint256 loss
        );

    /// @dev Calculates the debt accrued by a Credit Account
    /// @param creditAccount Address of the Credit Account
    /// @return borrowedAmount The debt principal
    /// @return borrowedAmountWithInterest The debt principal + accrued interest
    /// @return borrowedAmountWithInterestAndFees The debt principal + accrued interest and protocol fees
    function calcCreditAccountAccruedInterest(address creditAccount)
        external
        view
        returns (
            uint256 borrowedAmount,
            uint256 borrowedAmountWithInterest,
            uint256 borrowedAmountWithInterestAndFees
        );

    /// @dev Maps Credit Accounts to bit masks encoding their enabled token sets
    /// Only enabled tokens are counted as collateral for the Credit Account
    /// @notice An enabled token mask encodes an enabled token by setting
    ///         the bit at the position equal to token's index to 1
    function enabledTokensMap(address creditAccount)
        external
        view
        returns (uint256);

    /// @dev Maps the Credit Account to its current percentage drop across all swaps since
    ///      the last full check, in RAY format
    function cumulativeDropAtFastCheckRAY(address creditAccount)
        external
        view
        returns (uint256);

    /// @dev Returns the collateral token at requested index and its liquidation threshold
    /// @param id The index of token to return
    function collateralTokens(uint256 id)
        external
        view
        returns (address token, uint16 liquidationThreshold);

    /// @dev Returns the collateral token with requested mask and its liquidationThreshold
    /// @param tokenMask Token mask corresponding to the token
    function collateralTokensByMask(uint256 tokenMask)
        external
        view
        returns (address token, uint16 liquidationThreshold);

    /// @dev Total number of known collateral tokens.
    function collateralTokensCount() external view returns (uint256);

    /// @dev Returns the mask for the provided token
    /// @param token Token to returns the mask for
    function tokenMasksMap(address token) external view returns (uint256);

    /// @dev Bit mask encoding a set of forbidden tokens
    function forbiddenTokenMask() external view returns (uint256);

    /// @dev Maps allowed adapters to their respective target contracts.
    function adapterToContract(address adapter) external view returns (address);

    /// @dev Maps 3rd party contracts to their respective adapters
    function contractToAdapter(address targetContract)
        external
        view
        returns (address);

    /// @dev Address of the underlying asset
    function underlying() external view returns (address);

    /// @dev Address of the connected pool
    function pool() external view returns (address);

    /// @dev Address of the connected pool
    /// @notice [DEPRECATED]: use pool() instead.
    function poolService() external view returns (address);

    /// @dev A map from borrower addresses to Credit Account addresses
    function creditAccounts(address borrower) external view returns (address);

    /// @dev Address of the connected Credit Configurator
    function creditConfigurator() external view returns (address);

    /// @dev Address of WETH
    function wethAddress() external view returns (address);

    /// @dev Returns the liquidation threshold for the provided token
    /// @param token Token to retrieve the LT for
    function liquidationThresholds(address token)
        external
        view
        returns (uint16);

    /// @dev The maximal number of enabled tokens on a single Credit Account
    function maxAllowedEnabledTokenLength() external view returns (uint8);

    /// @dev Maps addresses to their status as emergency liquidator.
    /// @notice Emergency liquidators are trusted addresses
    /// that are able to liquidate positions while the contracts are paused,
    /// e.g. when there is a risk of bad debt while an exploit is being patched.
    /// In the interest of fairness, emergency liquidators do not receive a premium
    /// And are compensated by the Gearbox DAO separately.
    function canLiquidateWhilePaused(address) external view returns (bool);

    /// @dev Returns the fee parameters of the Credit Manager
    /// @return feeInterest Percentage of interest taken by the protocol as profit
    /// @return feeLiquidation Percentage of account value taken by the protocol as profit
    ///         during unhealthy account liquidations
    /// @return liquidationDiscount Multiplier that reduces the effective totalValue during unhealthy account liquidations,
    ///         allowing the liquidator to take the unaccounted for remainder as premium. Equal to (1 - liquidationPremium)
    /// @return feeLiquidationExpired Percentage of account value taken by the protocol as profit
    ///         during expired account liquidations
    /// @return liquidationDiscountExpired Multiplier that reduces the effective totalValue during expired account liquidations,
    ///         allowing the liquidator to take the unaccounted for remainder as premium. Equal to (1 - liquidationPremiumExpired)
    function fees()
        external
        view
        returns (
            uint16 feeInterest,
            uint16 feeLiquidation,
            uint16 liquidationDiscount,
            uint16 feeLiquidationExpired,
            uint16 liquidationDiscountExpired
        );

    /// @dev Address of the connected Credit Facade
    function creditFacade() external view returns (address);

    /// @dev Address of the connected Price Oracle
    function priceOracle() external view returns (IPriceOracleV2);

    /// @dev Address of the universal adapter
    function universalAdapter() external view returns (address);

    /// @dev Contract's version
    function version() external view returns (uint256);

    /// @dev Paused() state
    function checkEmergencyPausable(address caller, bool state)
        external
        returns (bool);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

/// @dev Common contract exceptions

/// @dev Thrown on attempting to set an important address to zero address
error ZeroAddressException();

/// @dev Thrown on attempting to call a non-implemented function
error NotImplementedException();

/// @dev Thrown on attempting to set an EOA as an important contract in the system
error AddressIsNotContractException(address);

/// @dev Thrown on attempting to use a non-ERC20 contract or an EOA as a token
error IncorrectTokenContractException();

/// @dev Thrown on attempting to set a token price feed to an address that is not a
///      correct price feed
error IncorrectPriceFeedException();

/// @dev Thrown on attempting to call an access restricted function as a non-Configurator
error CallerNotConfiguratorException();

/// @dev Thrown on attempting to call an access restricted function as a non-Configurator
error CallerNotControllerException();

/// @dev Thrown on attempting to pause a contract as a non-Pausable admin
error CallerNotPausableAdminException();

/// @dev Thrown on attempting to pause a contract as a non-Unpausable admin
error CallerNotUnPausableAdminException();

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;
import "../core/AddressProvider.sol";
import { IVersion } from "./IVersion.sol";

interface IPoolServiceEvents {
    /// @dev Emits on new liquidity being added to the pool
    event AddLiquidity(
        address indexed sender,
        address indexed onBehalfOf,
        uint256 amount,
        uint256 referralCode
    );

    /// @dev Emits on liquidity being removed to the pool
    event RemoveLiquidity(
        address indexed sender,
        address indexed to,
        uint256 amount
    );

    /// @dev Emits on a Credit Manager borrowing funds for a Credit Account
    event Borrow(
        address indexed creditManager,
        address indexed creditAccount,
        uint256 amount
    );

    /// @dev Emits on repayment of a Credit Account's debt
    event Repay(
        address indexed creditManager,
        uint256 borrowedAmount,
        uint256 profit,
        uint256 loss
    );

    /// @dev Emits on updating the interest rate model
    event NewInterestRateModel(address indexed newInterestRateModel);

    /// @dev Emits on connecting a new Credit Manager
    event NewCreditManagerConnected(address indexed creditManager);

    /// @dev Emits when a Credit Manager is forbidden to borrow
    event BorrowForbidden(address indexed creditManager);

    /// @dev Emitted when loss is incurred that can't be covered by treasury funds
    event UncoveredLoss(address indexed creditManager, uint256 loss);

    /// @dev Emits when the liquidity limit is changed
    event NewExpectedLiquidityLimit(uint256 newLimit);

    /// @dev Emits when the withdrawal fee is changed
    event NewWithdrawFee(uint256 fee);
}

/// @title Pool Service Interface
/// @notice Implements business logic:
///   - Adding/removing pool liquidity
///   - Managing diesel tokens & diesel rates
///   - Taking/repaying Credit Manager debt
/// More: https://dev.gearbox.fi/developers/pool/abstractpoolservice
interface IPoolService is IPoolServiceEvents, IVersion {
    //
    // LIQUIDITY MANAGEMENT
    //

    /**
     * @dev Adds liquidity to pool
     * - transfers the underlying to the pool
     * - mints Diesel (LP) tokens to onBehalfOf
     * @param amount Amount of tokens to be deposited
     * @param onBehalfOf The address that will receive the dToken
     * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
     *   0 if the action is executed directly by the user, without a facilitator.
     */
    function addLiquidity(
        uint256 amount,
        address onBehalfOf,
        uint256 referralCode
    ) external;

    /**
     * @dev Removes liquidity from pool
     * - burns LP's Diesel (LP) tokens
     * - returns the equivalent amount of underlying to 'to'
     * @param amount Amount of Diesel tokens to burn
     * @param to Address to transfer the underlying to
     */

    function removeLiquidity(uint256 amount, address to)
        external
        returns (uint256);

    /**
     * @dev Lends pool funds to a Credit Account
     * @param borrowedAmount Credit Account's debt principal
     * @param creditAccount Credit Account's address
     */
    function lendCreditAccount(uint256 borrowedAmount, address creditAccount)
        external;

    /**
     * @dev Repays the Credit Account's debt
     * @param borrowedAmount Amount of principal ro repay
     * @param profit The treasury profit from repayment
     * @param loss Amount of underlying that the CA wan't able to repay
     * @notice Assumes that the underlying (including principal + interest + fees)
     *         was already transferred
     */
    function repayCreditAccount(
        uint256 borrowedAmount,
        uint256 profit,
        uint256 loss
    ) external;

    //
    // GETTERS
    //

    /**
     * @dev Returns the total amount of liquidity in the pool, including borrowed and available funds
     */
    function expectedLiquidity() external view returns (uint256);

    /**
     * @dev Returns the limit on total liquidity
     */
    function expectedLiquidityLimit() external view returns (uint256);

    /**
     * @dev Returns the available liquidity, which is expectedLiquidity - totalBorrowed
     */
    function availableLiquidity() external view returns (uint256);

    /**
     * @dev Calculates the current interest index, RAY format
     */
    function calcLinearCumulative_RAY() external view returns (uint256);

    /**
     * @dev Calculates the current borrow rate, RAY format
     */
    function borrowAPY_RAY() external view returns (uint256);

    /**
     * @dev Returns the total borrowed amount (includes principal only)
     */
    function totalBorrowed() external view returns (uint256);

    /**
     * ç
     **/

    function getDieselRate_RAY() external view returns (uint256);

    /**
     * @dev Returns the address of the underlying
     */
    function underlyingToken() external view returns (address);

    /**
     * @dev Returns the address of the diesel token
     */
    function dieselToken() external view returns (address);

    /**
     * @dev Returns the address of a Credit Manager by its id
     */
    function creditManagers(uint256 id) external view returns (address);

    /**
     * @dev Returns the number of known Credit Managers
     */
    function creditManagersCount() external view returns (uint256);

    /**
     * @dev Maps Credit Manager addresses to their status as a borrower.
     *      Returns false if borrowing is not allowed.
     */
    function creditManagersCanBorrow(address id) external view returns (bool);

    /// @dev Converts a quantity of the underlying to Diesel tokens
    function toDiesel(uint256 amount) external view returns (uint256);

    /// @dev Converts a quantity of Diesel tokens to the underlying
    function fromDiesel(uint256 amount) external view returns (uint256);

    /// @dev Returns the withdrawal fee
    function withdrawFee() external view returns (uint256);

    /// @dev Returns the timestamp of the pool's last update
    function _timestampLU() external view returns (uint256);

    /// @dev Returns the interest index at the last pool update
    function _cumulativeIndex_RAY() external view returns (uint256);

    /// @dev Returns the address provider
    function addressProvider() external view returns (AddressProvider);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;
import { IVersion } from "./IVersion.sol";

interface IPriceOracleV2Events {
    /// @dev Emits when a new price feed is added
    event NewPriceFeed(address indexed token, address indexed priceFeed);
}

interface IPriceOracleV2Exceptions {
    /// @dev Thrown if a price feed returns 0
    error ZeroPriceException();

    /// @dev Thrown if the last recorded result was not updated in the last round
    error ChainPriceStaleException();

    /// @dev Thrown on attempting to get a result for a token that does not have a price feed
    error PriceOracleNotExistsException();
}

/// @title Price oracle interface
interface IPriceOracleV2 is
    IPriceOracleV2Events,
    IPriceOracleV2Exceptions,
    IVersion
{
    /// @dev Converts a quantity of an asset to USD (decimals = 8).
    /// @param amount Amount to convert
    /// @param token Address of the token to be converted
    function convertToUSD(uint256 amount, address token)
        external
        view
        returns (uint256);

    /// @dev Converts a quantity of USD (decimals = 8) to an equivalent amount of an asset
    /// @param amount Amount to convert
    /// @param token Address of the token converted to
    function convertFromUSD(uint256 amount, address token)
        external
        view
        returns (uint256);

    /// @dev Converts one asset into another
    ///
    /// @param amount Amount to convert
    /// @param tokenFrom Address of the token to convert from
    /// @param tokenTo Address of the token to convert to
    function convert(
        uint256 amount,
        address tokenFrom,
        address tokenTo
    ) external view returns (uint256);

    /// @dev Returns collateral values for two tokens, required for a fast check
    /// @param amountFrom Amount of the outbound token
    /// @param tokenFrom Address of the outbound token
    /// @param amountTo Amount of the inbound token
    /// @param tokenTo Address of the inbound token
    /// @return collateralFrom Value of the outbound token amount in USD
    /// @return collateralTo Value of the inbound token amount in USD
    function fastCheck(
        uint256 amountFrom,
        address tokenFrom,
        uint256 amountTo,
        address tokenTo
    ) external view returns (uint256 collateralFrom, uint256 collateralTo);

    /// @dev Returns token's price in USD (8 decimals)
    /// @param token The token to compute the price for
    function getPrice(address token) external view returns (uint256);

    /// @dev Returns the price feed address for the passed token
    /// @param token Token to get the price feed for
    function priceFeeds(address token)
        external
        view
        returns (address priceFeed);

    /// @dev Returns the price feed for the passed token,
    ///      with additional parameters
    /// @param token Token to get the price feed for
    function priceFeedsWithFlags(address token)
        external
        view
        returns (
            address priceFeed,
            bool skipCheck,
            uint256 decimals
        );
}

interface IPriceOracleV2Ext is IPriceOracleV2 {
    /// @dev Sets a price feed if it doesn't exist, or updates an existing one
    /// @param token Address of the token to set the price feed for
    /// @param priceFeed Address of a USD price feed adhering to Chainlink's interface
    function addPriceFeed(address token, address priceFeed) external;
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

/// @title IVersion
/// @dev Declares a version function which returns the contract's version
interface IVersion {
    /// @dev Returns contract version
    function version() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

// Denominations

uint256 constant WAD = 1e18;
uint256 constant RAY = 1e27;

// 25% of type(uint256).max
uint256 constant ALLOWANCE_THRESHOLD = type(uint96).max >> 3;

// FEE = 50%
uint16 constant DEFAULT_FEE_INTEREST = 50_00; // 50%

// LIQUIDATION_FEE 1.5%
uint16 constant DEFAULT_FEE_LIQUIDATION = 1_50; // 1.5%

// LIQUIDATION PREMIUM 4%
uint16 constant DEFAULT_LIQUIDATION_PREMIUM = 4_00; // 4%

// LIQUIDATION_FEE_EXPIRED 2%
uint16 constant DEFAULT_FEE_LIQUIDATION_EXPIRED = 1_00; // 2%

// LIQUIDATION PREMIUM EXPIRED 2%
uint16 constant DEFAULT_LIQUIDATION_PREMIUM_EXPIRED = 2_00; // 2%

// DEFAULT PROPORTION OF MAX BORROWED PER BLOCK TO MAX BORROWED PER ACCOUNT
uint16 constant DEFAULT_LIMIT_PER_BLOCK_MULTIPLIER = 2;

// Seconds in a year
uint256 constant SECONDS_PER_YEAR = 365 days;
uint256 constant SECONDS_PER_ONE_AND_HALF_YEAR = (SECONDS_PER_YEAR * 3) / 2;

// OPERATIONS

// Leverage decimals - 100 is equal to 2x leverage (100% * collateral amount + 100% * borrowed amount)
uint8 constant LEVERAGE_DECIMALS = 100;

// Maximum withdraw fee for pool in PERCENTAGE_FACTOR format
uint8 constant MAX_WITHDRAW_FEE = 100;

uint256 constant EXACT_INPUT = 1;
uint256 constant EXACT_OUTPUT = 2;

address constant UNIVERSAL_CONTRACT = 0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC;

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

/// @title Errors library
library Errors {
    //
    // COMMON
    //
    string public constant ZERO_ADDRESS_IS_NOT_ALLOWED = "Z0";
    string public constant NOT_IMPLEMENTED = "NI";
    string public constant INCORRECT_PATH_LENGTH = "PL";
    string public constant INCORRECT_ARRAY_LENGTH = "CR";
    string public constant REGISTERED_CREDIT_ACCOUNT_MANAGERS_ONLY = "CP";
    string public constant REGISTERED_POOLS_ONLY = "RP";
    string public constant INCORRECT_PARAMETER = "IP";

    //
    // MATH
    //
    string public constant MATH_MULTIPLICATION_OVERFLOW = "M1";
    string public constant MATH_ADDITION_OVERFLOW = "M2";
    string public constant MATH_DIVISION_BY_ZERO = "M3";

    //
    // POOL
    //
    string public constant POOL_CONNECTED_CREDIT_MANAGERS_ONLY = "PS0";
    string public constant POOL_INCOMPATIBLE_CREDIT_ACCOUNT_MANAGER = "PS1";
    string public constant POOL_MORE_THAN_EXPECTED_LIQUIDITY_LIMIT = "PS2";
    string public constant POOL_INCORRECT_WITHDRAW_FEE = "PS3";
    string public constant POOL_CANT_ADD_CREDIT_MANAGER_TWICE = "PS4";

    //
    // ACCOUNT FACTORY
    //
    string public constant AF_CANT_CLOSE_CREDIT_ACCOUNT_IN_THE_SAME_BLOCK =
        "AF1";
    string public constant AF_MINING_IS_FINISHED = "AF2";
    string public constant AF_CREDIT_ACCOUNT_NOT_IN_STOCK = "AF3";
    string public constant AF_EXTERNAL_ACCOUNTS_ARE_FORBIDDEN = "AF4";

    //
    // ADDRESS PROVIDER
    //
    string public constant AS_ADDRESS_NOT_FOUND = "AP1";

    //
    // CONTRACTS REGISTER
    //
    string public constant CR_POOL_ALREADY_ADDED = "CR1";
    string public constant CR_CREDIT_MANAGER_ALREADY_ADDED = "CR2";

    //
    // CREDIT ACCOUNT
    //
    string public constant CA_CONNECTED_CREDIT_MANAGER_ONLY = "CA1";
    string public constant CA_FACTORY_ONLY = "CA2";

    //
    // ACL
    //
    string public constant ACL_CALLER_NOT_PAUSABLE_ADMIN = "ACL1";
    string public constant ACL_CALLER_NOT_CONFIGURATOR = "ACL2";

    //
    // WETH GATEWAY
    //
    string public constant WG_DESTINATION_IS_NOT_WETH_COMPATIBLE = "WG1";
    string public constant WG_RECEIVE_IS_NOT_ALLOWED = "WG2";
    string public constant WG_NOT_ENOUGH_FUNDS = "WG3";

    //
    // TOKEN DISTRIBUTOR
    //
    string public constant TD_WALLET_IS_ALREADY_CONNECTED_TO_VC = "TD1";
    string public constant TD_INCORRECT_WEIGHTS = "TD2";
    string public constant TD_NON_ZERO_BALANCE_AFTER_DISTRIBUTION = "TD3";
    string public constant TD_CONTRIBUTOR_IS_NOT_REGISTERED = "TD4";
}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2023
pragma solidity ^0.8.17;

import {AbstractAdapter} from "@gearbox-protocol/core-v2/contracts/adapters/AbstractAdapter.sol";

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2023
pragma solidity ^0.8.17;

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

import {ZeroAddressException} from "@gearbox-protocol/core-v2/contracts/interfaces/IErrors.sol";
import {RAY} from "@gearbox-protocol/core-v2/contracts/libraries/Constants.sol";

import {AbstractAdapter} from "../AbstractAdapter.sol";
import {AdapterType} from "../../interfaces/IAdapter.sol";

import {ICurvePool} from "../../integrations/curve/ICurvePool.sol";
import {ICurvePool2Assets} from "../../integrations/curve/ICurvePool_2.sol";
import {ICurvePool3Assets} from "../../integrations/curve/ICurvePool_3.sol";
import {ICurvePool4Assets} from "../../integrations/curve/ICurvePool_4.sol";

import {ICurveV1Adapter} from "../../interfaces/curve/ICurveV1Adapter.sol";

uint256 constant ZERO = 0;

/// @title Curve V1 base adapter
/// @notice Implements logic allowing to interact with all Curve pools, regardless of number of coins
contract CurveV1AdapterBase is AbstractAdapter, ICurveV1Adapter {
    using SafeCast for uint256;
    using SafeCast for int256;

    uint16 public constant override _gearboxAdapterVersion = 2;

    function _gearboxAdapterType() external pure virtual override returns (AdapterType) {
        return AdapterType.CURVE_V1_EXCHANGE_ONLY;
    }

    /// @inheritdoc ICurveV1Adapter
    address public immutable override token;

    /// @inheritdoc ICurveV1Adapter
    address public immutable override lp_token;

    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override lpTokenMask;

    /// @inheritdoc ICurveV1Adapter
    address public immutable override metapoolBase;

    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override nCoins;

    /// @inheritdoc ICurveV1Adapter
    bool public immutable override use256;

    /// @inheritdoc ICurveV1Adapter
    address public immutable token0;
    /// @inheritdoc ICurveV1Adapter
    address public immutable token1;
    /// @inheritdoc ICurveV1Adapter
    address public immutable token2;
    /// @inheritdoc ICurveV1Adapter
    address public immutable token3;

    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override token0Mask;
    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override token1Mask;
    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override token2Mask;
    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override token3Mask;

    /// @inheritdoc ICurveV1Adapter
    address public immutable override underlying0;
    /// @inheritdoc ICurveV1Adapter
    address public immutable override underlying1;
    /// @inheritdoc ICurveV1Adapter
    address public immutable override underlying2;
    /// @inheritdoc ICurveV1Adapter
    address public immutable override underlying3;

    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override underlying0Mask;
    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override underlying1Mask;
    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override underlying2Mask;
    /// @inheritdoc ICurveV1Adapter
    uint256 public immutable override underlying3Mask;

    /// @notice Constructor
    /// @param _creditManager Credit manager address
    /// @param _curvePool Target Curve pool address
    /// @param _lp_token Pool LP token address
    /// @param _metapoolBase Base pool address (for metapools only) or zero address
    /// @param _nCoins Number of coins in the pool
    constructor(address _creditManager, address _curvePool, address _lp_token, address _metapoolBase, uint256 _nCoins)
        AbstractAdapter(_creditManager, _curvePool)
    {
        if (_lp_token == address(0)) revert ZeroAddressException(); // F: [ACV1-1]

        lpTokenMask = _getMaskOrRevert(_lp_token); // F: [ACV1-2]

        token = _lp_token; // F: [ACV1-2]
        lp_token = _lp_token; // F: [ACV1-2]
        metapoolBase = _metapoolBase; // F: [ACV1-2]
        nCoins = _nCoins; // F: [ACV1-2]

        {
            bool _use256;

            /// Only Curve v2 pools have mid_fee, so it can be used to determine
            /// whether to use int128 or uint256 function signatures
            try ICurvePool(targetContract).mid_fee() returns (uint256) {
                _use256 = true;
            } catch {
                _use256 = false;
            }

            use256 = _use256;
        }

        address[4] memory tokens;
        uint256[4] memory tokenMasks;
        for (uint256 i = 0; i < nCoins;) {
            address currentCoin;
            try ICurvePool(targetContract).coins(i) returns (address tokenAddress) {
                currentCoin = tokenAddress;
            } catch {
                try ICurvePool(targetContract).coins(i.toInt256().toInt128()) returns (address tokenAddress) {
                    currentCoin = tokenAddress;
                } catch {}
            }

            if (currentCoin == address(0)) revert ZeroAddressException(); // F: [ACV1-1]
            uint256 currentMask = _getMaskOrRevert(currentCoin);

            tokens[i] = currentCoin;
            tokenMasks[i] = currentMask;

            unchecked {
                ++i;
            }
        }

        token0 = tokens[0]; // F: [ACV1-2]
        token1 = tokens[1]; // F: [ACV1-2]
        token2 = tokens[2]; // F: [ACV1-2]
        token3 = tokens[3]; // F: [ACV1-2]

        token0Mask = tokenMasks[0]; // F: [ACV1-2]
        token1Mask = tokenMasks[1]; // F: [ACV1-2]
        token2Mask = tokenMasks[2]; // F: [ACV1-2]
        token3Mask = tokenMasks[3]; // F: [ACV1-2]

        tokens = [address(0), address(0), address(0), address(0)];
        tokenMasks = [ZERO, ZERO, ZERO, ZERO];

        for (uint256 i = 0; i < 4;) {
            address currentCoin;
            uint256 currentMask;

            if (metapoolBase != address(0)) {
                if (i == 0) {
                    currentCoin = token0;
                } else {
                    try ICurvePool(metapoolBase).coins(i - 1) returns (address tokenAddress) {
                        currentCoin = tokenAddress;
                    } catch {}
                }
            } else {
                try ICurvePool(targetContract).underlying_coins(i) returns (address tokenAddress) {
                    currentCoin = tokenAddress;
                } catch {
                    try ICurvePool(targetContract).underlying_coins(i.toInt256().toInt128()) returns (
                        address tokenAddress
                    ) {
                        currentCoin = tokenAddress;
                    } catch {}
                }
            }

            if (currentCoin != address(0)) {
                currentMask = _getMaskOrRevert(currentCoin); // F: [ACV1-1]
            }

            tokens[i] = currentCoin;
            tokenMasks[i] = currentMask;

            unchecked {
                ++i;
            }
        }

        underlying0 = tokens[0]; // F: [ACV1-2]
        underlying1 = tokens[1]; // F: [ACV1-2]
        underlying2 = tokens[2]; // F: [ACV1-2]
        underlying3 = tokens[3]; // F: [ACV1-2]

        underlying0Mask = tokenMasks[0]; // F: [ACV1-2]
        underlying1Mask = tokenMasks[1]; // F: [ACV1-2]
        underlying2Mask = tokenMasks[2]; // F: [ACV1-2]
        underlying3Mask = tokenMasks[3]; // F: [ACV1-2]
    }

    /// -------- ///
    /// EXCHANGE ///
    /// -------- ///

    /// @inheritdoc ICurveV1Adapter
    function exchange(int128 i, int128 j, uint256, uint256) external override creditFacadeOnly {
        _exchange(i, j);
    }

    /// @inheritdoc ICurveV1Adapter
    function exchange(uint256 i, uint256 j, uint256, uint256) external override creditFacadeOnly {
        _exchange(i.toInt256().toInt128(), j.toInt256().toInt128());
    }

    /// @dev Internal implementation of `exchange`
    function _exchange(int128 i, int128 j) internal {
        _exchange_impl(i, j, msg.data, false, false); // F: [ACV1-4]
    }

    /// @inheritdoc ICurveV1Adapter
    function exchange_all(int128 i, int128 j, uint256 rateMinRAY) external override creditFacadeOnly {
        _exchange_all(i, j, rateMinRAY);
    }

    /// @inheritdoc ICurveV1Adapter
    function exchange_all(uint256 i, uint256 j, uint256 rateMinRAY) external override creditFacadeOnly {
        _exchange_all(i.toInt256().toInt128(), j.toInt256().toInt128(), rateMinRAY);
    }

    /// @dev Internal implementation of `exchange_all`
    function _exchange_all(int128 i, int128 j, uint256 rateMinRAY) internal {
        address creditAccount = _creditAccount(); // F: [ACV1-3]

        address tokenIn = _get_token(i, false); // F: [ACV1-5]
        uint256 dx = IERC20(tokenIn).balanceOf(creditAccount); // F: [ACV1-5]
        if (dx <= 1) return;

        unchecked {
            dx--;
        }
        uint256 min_dy = (dx * rateMinRAY) / RAY; // F: [ACV1-5]
        _exchange_impl(i, j, _getExchangeCallData(i, j, dx, min_dy, false), false, true); // F: [ACV1-5]
    }

    /// @inheritdoc ICurveV1Adapter
    function exchange_underlying(int128 i, int128 j, uint256, uint256) external override creditFacadeOnly {
        _exchange_underlying(i, j);
    }

    /// @inheritdoc ICurveV1Adapter
    function exchange_underlying(uint256 i, uint256 j, uint256, uint256) external override creditFacadeOnly {
        _exchange_underlying(i.toInt256().toInt128(), j.toInt256().toInt128());
    }

    /// @dev Internal implementation of `exchange_underlying`
    function _exchange_underlying(int128 i, int128 j) internal {
        _exchange_impl(i, j, msg.data, true, false); // F: [ACV1-6]
    }

    /// @inheritdoc ICurveV1Adapter
    function exchange_all_underlying(int128 i, int128 j, uint256 rateMinRAY) external override creditFacadeOnly {
        _exchange_all_underlying(i, j, rateMinRAY);
    }

    /// @inheritdoc ICurveV1Adapter
    function exchange_all_underlying(uint256 i, uint256 j, uint256 rateMinRAY) external override creditFacadeOnly {
        _exchange_all_underlying(i.toInt256().toInt128(), j.toInt256().toInt128(), rateMinRAY);
    }

    /// @dev Internal implementation of `exchange_all_underlying`
    function _exchange_all_underlying(int128 i, int128 j, uint256 rateMinRAY) internal {
        address creditAccount = _creditAccount(); //F: [ACV1-3]

        address tokenIn = _get_token(i, true); // F: [ACV1-7]
        uint256 dx = IERC20(tokenIn).balanceOf(creditAccount); // F: [ACV1-7]
        if (dx <= 1) return;

        unchecked {
            dx--; // F: [ACV1-7]
        }
        uint256 min_dy = (dx * rateMinRAY) / RAY; // F: [ACV1-7]
        _exchange_impl(i, j, _getExchangeCallData(i, j, dx, min_dy, true), true, true); // F: [ACV1-7]
    }

    /// @dev Internal implementation of exchange functions
    ///      - passes calldata to the target contract
    ///      - sets max approval for the input token before the call and resets it to 1 after
    ///      - enables output asset after the call
    ///      - disables input asset only when exchanging the entire balance
    function _exchange_impl(int128 i, int128 j, bytes memory callData, bool underlying, bool disableTokenIn) internal {
        _approve_token(i, underlying, type(uint256).max);
        _execute(callData);
        _approve_token(i, underlying, 1);
        _changeEnabledTokens(_get_token_mask(j, underlying), disableTokenIn ? _get_token_mask(i, underlying) : 0);
    }

    /// @dev Returns calldata for `ICurvePool.exchange` and `ICurvePool.exchange_underlying` calls
    function _getExchangeCallData(int128 i, int128 j, uint256 dx, uint256 min_dy, bool underlying)
        internal
        view
        returns (bytes memory)
    {
        if (use256) {
            return underlying
                ? abi.encodeWithSignature(
                    "exchange_underlying(uint256,uint256,uint256,uint256)",
                    uint256(int256(i)),
                    uint256(int256(j)),
                    dx,
                    min_dy
                )
                : abi.encodeWithSignature(
                    "exchange(uint256,uint256,uint256,uint256)", uint256(int256(i)), uint256(int256(j)), dx, min_dy
                );
        } else {
            return underlying
                ? abi.encodeWithSignature("exchange_underlying(int128,int128,uint256,uint256)", i, j, dx, min_dy)
                : abi.encodeWithSignature("exchange(int128,int128,uint256,uint256)", i, j, dx, min_dy);
        }
    }

    /// ------------- ///
    /// ADD LIQUIDITY ///
    /// ------------- ///

    /// @dev Internal implementation of `add_liquidity`
    ///      - passes calldata to the target contract
    ///      - sets max approvals for the specified tokens before the call and resets them to 1 after
    ///      - enables LP token
    function _add_liquidity(bool t0Approve, bool t1Approve, bool t2Approve, bool t3Approve) internal {
        _approve_tokens(t0Approve, t1Approve, t2Approve, t3Approve, type(uint256).max);
        _execute(msg.data);
        _approve_tokens(t0Approve, t1Approve, t2Approve, t3Approve, 1);
        _changeEnabledTokens(lpTokenMask, 0);
    }

    /// @inheritdoc ICurveV1Adapter
    function add_liquidity_one_coin(uint256 amount, int128 i, uint256 minAmount) external override creditFacadeOnly {
        _add_liquidity_one_coin(amount, i, minAmount);
    }

    /// @inheritdoc ICurveV1Adapter
    function add_liquidity_one_coin(uint256 amount, uint256 i, uint256 minAmount) external override creditFacadeOnly {
        _add_liquidity_one_coin(amount, i.toInt256().toInt128(), minAmount);
    }

    /// @dev Internal implementation of `add_liquidity_one_coin`
    function _add_liquidity_one_coin(uint256 amount, int128 i, uint256 minAmount) internal {
        _add_liquidity_one_coin_impl(i, _getAddLiquidityOneCoinCallData(i, amount, minAmount), false); // F: [ACV1-8]
    }

    /// @inheritdoc ICurveV1Adapter
    function add_all_liquidity_one_coin(int128 i, uint256 rateMinRAY) external override creditFacadeOnly {
        _add_all_liquidity_one_coin(i, rateMinRAY);
    }

    /// @inheritdoc ICurveV1Adapter
    function add_all_liquidity_one_coin(uint256 i, uint256 rateMinRAY) external override creditFacadeOnly {
        _add_all_liquidity_one_coin(i.toInt256().toInt128(), rateMinRAY);
    }

    /// @dev Internal implementation of `add_all_liquidity_one_coin`
    function _add_all_liquidity_one_coin(int128 i, uint256 rateMinRAY) internal {
        address creditAccount = _creditAccount();

        address tokenIn = _get_token(i, false);
        uint256 amount = IERC20(tokenIn).balanceOf(creditAccount); // F: [ACV1-9]
        if (amount <= 1) return;

        unchecked {
            amount--; // F: [ACV1-9]
        }
        uint256 minAmount = (amount * rateMinRAY) / RAY; // F: [ACV1-9]
        _add_liquidity_one_coin_impl(i, _getAddLiquidityOneCoinCallData(i, amount, minAmount), true); // F: [ACV1-9]
    }

    /// @dev Internal implementation of `add_liquidity_one_coin` and `add_all_liquidity_one_coin`
    ///      - passes calldata to the target contract
    ///      - sets max approval for the input token before the call and resets it to 1 after
    ///      - enables LP token
    ///      - disables input token only when adding the entire balance
    function _add_liquidity_one_coin_impl(int128 i, bytes memory callData, bool disableTokenIn) internal {
        _approve_token(i, false, type(uint256).max);
        _execute(callData);
        _approve_token(i, false, 1);
        _changeEnabledTokens(lpTokenMask, disableTokenIn ? _get_token_mask(i, false) : 0);
    }

    /// @dev Returns calldata for `ICurvePool.add_liquidity` with one input asset
    function _getAddLiquidityOneCoinCallData(int128 i, uint256 amount, uint256 minAmount)
        internal
        view
        returns (bytes memory)
    {
        if (nCoins == 2) {
            uint256[2] memory amounts;
            if (i > 1) revert IncorrectIndexException();
            amounts[uint256(uint128(i))] = amount;
            return abi.encodeCall(ICurvePool2Assets.add_liquidity, (amounts, minAmount)); // F: [ACV1-8, ACV1-9]
        }
        if (nCoins == 3) {
            uint256[3] memory amounts;
            if (i > 2) revert IncorrectIndexException();
            amounts[uint256(uint128(i))] = amount;
            return abi.encodeCall(ICurvePool3Assets.add_liquidity, (amounts, minAmount)); // F: [ACV1-8, ACV1-9]
        }
        if (nCoins == 4) {
            uint256[4] memory amounts;
            if (i > 3) revert IncorrectIndexException();
            amounts[uint256(uint128(i))] = amount;
            return abi.encodeCall(ICurvePool4Assets.add_liquidity, (amounts, minAmount)); // F: [ACV1-8, ACV1-9]
        }
        revert("Incorrect nCoins");
    }

    /// ---------------- ///
    /// REMOVE LIQUIDITY ///
    /// ---------------- ///

    /// @dev Internal implementation of `remove_liquidity`
    ///      - passes calldata to the target contract
    ///      - enables all pool tokens
    function _remove_liquidity() internal {
        _execute(msg.data);
        _changeEnabledTokens(token0Mask | token1Mask | token2Mask | token3Mask, 0); // F: [ACV1_2-5, ACV1_3-5, ACV1_4-5]
    }

    /// @dev Internal implementation of `remove_liquidity_imbalance`
    ///      - passes calldata to the target contract
    ///      - enables specified pool tokens
    function _remove_liquidity_imbalance(bool t0Enable, bool t1Enable, bool t2Enable, bool t3Enable) internal {
        _execute(msg.data);

        uint256 tokensMask;
        if (t0Enable) tokensMask |= _get_token_mask(0, false); // F: [ACV1_2-6, ACV1_3-6, ACV1_4-6]
        if (t1Enable) tokensMask |= _get_token_mask(1, false); // F: [ACV1_2-6, ACV1_3-6, ACV1_4-6]
        if (t2Enable) tokensMask |= _get_token_mask(2, false); // F: [ACV1_3-6, ACV1_4-6]
        if (t3Enable) tokensMask |= _get_token_mask(3, false); // F: [ACV1_4-6]
        _changeEnabledTokens(tokensMask, 0); // F: [ACV1_2-6, ACV1_3-6, ACV1_4-6]
    }

    /// @inheritdoc ICurveV1Adapter
    function remove_liquidity_one_coin(uint256, int128 i, uint256) external virtual override creditFacadeOnly {
        _remove_liquidity_one_coin(i);
    }

    /// @inheritdoc ICurveV1Adapter
    function remove_liquidity_one_coin(uint256, uint256 i, uint256) external override creditFacadeOnly {
        _remove_liquidity_one_coin(i.toInt256().toInt128());
    }

    /// @dev Internal implementation of `remove_liquidity_one_coin`
    function _remove_liquidity_one_coin(int128 i) internal {
        _remove_liquidity_one_coin_impl(i, msg.data, false); // F: [ACV1-10]
    }

    /// @inheritdoc ICurveV1Adapter
    function remove_all_liquidity_one_coin(int128 i, uint256 rateMinRAY) external virtual override creditFacadeOnly {
        _remove_all_liquidity_one_coin(i, rateMinRAY);
    }

    /// @inheritdoc ICurveV1Adapter
    function remove_all_liquidity_one_coin(uint256 i, uint256 rateMinRAY) external override creditFacadeOnly {
        _remove_all_liquidity_one_coin(i.toInt256().toInt128(), rateMinRAY);
    }

    /// @dev Internal implementation of `remove_all_liquidity_one_coin`
    function _remove_all_liquidity_one_coin(int128 i, uint256 rateMinRAY) internal {
        address creditAccount = _creditAccount();

        uint256 amount = IERC20(lp_token).balanceOf(creditAccount); // F: [ACV1-11]
        if (amount <= 1) return;

        unchecked {
            amount--; // F: [ACV1-11]
        }
        uint256 minAmount = (amount * rateMinRAY) / RAY; // F: [ACV1-11]
        _remove_liquidity_one_coin_impl(i, _getRemoveLiquidityOneCoinCallData(i, amount, minAmount), true); // F: [ACV1-11]
    }

    /// @dev Internal implementation of `remove_liquidity_one_coin` and `remove_all_liquidity_one_coin`
    ///      - passes calldata to the targe contract
    ///      - enables received asset
    ///      - disables LP token only when removing all liquidity
    function _remove_liquidity_one_coin_impl(int128 i, bytes memory callData, bool disableLP) internal {
        _execute(callData);
        _changeEnabledTokens(_get_token_mask(i, false), disableLP ? lpTokenMask : 0);
    }

    /// @dev Returns calldata for `ICurvePool.remove_liquidity_one_coin` call
    function _getRemoveLiquidityOneCoinCallData(int128 i, uint256 amount, uint256 minAmount)
        internal
        view
        returns (bytes memory)
    {
        if (use256) {
            return abi.encodeWithSignature(
                "remove_liquidity_one_coin(uint256,uint256,uint256)", amount, uint256(int256(i)), minAmount
            );
        } else {
            return abi.encodeWithSignature("remove_liquidity_one_coin(uint256,int128,uint256)", amount, i, minAmount);
        }
    }

    /// ------- ///
    /// HELPERS ///
    /// ------- ///

    /// @dev Returns token `i`'s address
    function _get_token(int128 i, bool underlying) internal view returns (address addr) {
        if (i == 0) {
            addr = underlying ? underlying0 : token0;
        } else if (i == 1) {
            addr = underlying ? underlying1 : token1;
        } else if (i == 2) {
            addr = underlying ? underlying2 : token2;
        } else if (i == 3) {
            addr = underlying ? underlying3 : token3;
        }

        if (addr == address(0)) revert IncorrectIndexException();
    }

    /// @dev Returns token `i`'s mask
    function _get_token_mask(int128 i, bool underlying) internal view returns (uint256 mask) {
        if (i == 0) {
            mask = underlying ? underlying0Mask : token0Mask;
        } else if (i == 1) {
            mask = underlying ? underlying1Mask : token1Mask;
        } else if (i == 2) {
            mask = underlying ? underlying2Mask : token2Mask;
        } else if (i == 3) {
            mask = underlying ? underlying3Mask : token3Mask;
        }

        if (mask == 0) revert IncorrectIndexException();
    }

    /// @dev Sets target contract's approval for token `i` to `amount`
    function _approve_token(int128 i, bool underlying, uint256 amount) internal {
        _approveToken(_get_token(i, underlying), amount);
    }

    /// @dev Sets target contract's approval for specified tokens to `amount`
    function _approve_tokens(bool t0Approve, bool t1Approve, bool t2Approve, bool t3Approve, uint256 amount) internal {
        if (t0Approve) _approveToken(token0, amount); // F: [ACV1_2-4, ACV1_3-4, ACV1_4-4]
        if (t1Approve) _approveToken(token1, amount); // F: [ACV1_2-4, ACV1_3-4, ACV1_4-4]
        if (t2Approve) _approveToken(token2, amount); // F: [ACV1_3-4, ACV1_4-4]
        if (t3Approve) _approveToken(token3, amount); // F: [ACV1_4-4]
    }

    /// @inheritdoc ICurveV1Adapter
    function calc_add_one_coin(uint256 amount, int128 i) public view returns (uint256) {
        if (nCoins == 2) {
            return i == 0
                ? ICurvePool2Assets(targetContract).calc_token_amount([amount, 0], true)
                : ICurvePool2Assets(targetContract).calc_token_amount([0, amount], true);
        } else if (nCoins == 3) {
            return i == 0
                ? ICurvePool3Assets(targetContract).calc_token_amount([amount, 0, 0], true)
                : i == 1
                    ? ICurvePool3Assets(targetContract).calc_token_amount([0, amount, 0], true)
                    : ICurvePool3Assets(targetContract).calc_token_amount([0, 0, amount], true);
        } else if (nCoins == 4) {
            return i == 0
                ? ICurvePool4Assets(targetContract).calc_token_amount([amount, 0, 0, 0], true)
                : i == 1
                    ? ICurvePool4Assets(targetContract).calc_token_amount([0, amount, 0, 0], true)
                    : i == 2
                        ? ICurvePool4Assets(targetContract).calc_token_amount([0, 0, amount, 0], true)
                        : ICurvePool4Assets(targetContract).calc_token_amount([0, 0, 0, amount], true);
        } else {
            revert("Incorrect nCoins");
        }
    }

    /// @inheritdoc ICurveV1Adapter
    function calc_add_one_coin(uint256 amount, uint256 i) external view returns (uint256) {
        return calc_add_one_coin(amount, i.toInt256().toInt128());
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.10;

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

uint256 constant N_COINS = 2;

/// @title ICurvePool2Assets
/// @dev Extends original pool contract with liquidity functions
interface ICurvePool2Assets is ICurvePool {
    function add_liquidity(uint256[N_COINS] memory amounts, uint256 min_mint_amount) external;

    function remove_liquidity(uint256 _amount, uint256[N_COINS] memory min_amounts) external;

    function remove_liquidity_imbalance(uint256[N_COINS] calldata amounts, uint256 max_burn_amount) external;

    function calc_token_amount(uint256[N_COINS] calldata _amounts, bool _is_deposit) external view returns (uint256);

    function get_twap_balances(
        uint256[N_COINS] calldata _first_balances,
        uint256[N_COINS] calldata _last_balances,
        uint256 _time_elapsed
    ) external view returns (uint256[N_COINS] memory);

    function get_balances() external view returns (uint256[N_COINS] memory);

    function get_previous_balances() external view returns (uint256[N_COINS] memory);

    function get_price_cumulative_last() external view returns (uint256[N_COINS] memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.10;

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

uint256 constant N_COINS = 3;

/// @title ICurvePool3Assets
/// @dev Extends original pool contract with liquidity functions
interface ICurvePool3Assets is ICurvePool {
    function add_liquidity(uint256[N_COINS] memory amounts, uint256 min_mint_amount) external;

    function remove_liquidity(uint256 _amount, uint256[N_COINS] memory min_amounts) external;

    function remove_liquidity_imbalance(uint256[N_COINS] memory amounts, uint256 max_burn_amount) external;

    function calc_token_amount(uint256[N_COINS] calldata _amounts, bool _is_deposit) external view returns (uint256);

    function get_twap_balances(
        uint256[N_COINS] calldata _first_balances,
        uint256[N_COINS] calldata _last_balances,
        uint256 _time_elapsed
    ) external view returns (uint256[N_COINS] memory);

    function get_balances() external view returns (uint256[N_COINS] memory);

    function get_previous_balances() external view returns (uint256[N_COINS] memory);

    function get_price_cumulative_last() external view returns (uint256[N_COINS] memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.10;

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

uint256 constant N_COINS = 4;

/// @title ICurvePool4Assets
/// @dev Extends original pool contract with liquidity functions
interface ICurvePool4Assets is ICurvePool {
    function add_liquidity(uint256[N_COINS] memory amounts, uint256 min_mint_amount) external;

    function remove_liquidity(uint256 _amount, uint256[N_COINS] memory min_amounts) external;

    function remove_liquidity_imbalance(uint256[N_COINS] memory amounts, uint256 max_burn_amount) external;

    function calc_token_amount(uint256[N_COINS] calldata _amounts, bool _is_deposit) external view returns (uint256);

    function get_twap_balances(
        uint256[N_COINS] calldata _first_balances,
        uint256[N_COINS] calldata _last_balances,
        uint256 _time_elapsed
    ) external view returns (uint256[N_COINS] memory);

    function get_balances() external view returns (uint256[N_COINS] memory);

    function get_previous_balances() external view returns (uint256[N_COINS] memory);

    function get_price_cumulative_last() external view returns (uint256[N_COINS] memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.10;

interface ICurvePool {
    function coins(uint256 i) external view returns (address);

    function underlying_coins(uint256 i) external view returns (address);

    function balances(uint256 i) external view returns (uint256);

    function coins(int128) external view returns (address);

    function underlying_coins(int128) external view returns (address);

    function balances(int128) external view returns (uint256);

    function exchange(int128 i, int128 j, uint256 dx, uint256 min_dy) external;

    function exchange(uint256 i, uint256 j, uint256 dx, uint256 min_dy) external;

    function exchange_underlying(int128 i, int128 j, uint256 dx, uint256 min_dy) external;

    function exchange_underlying(uint256 i, uint256 j, uint256 dx, uint256 min_dy) external;

    function get_dy_underlying(int128 i, int128 j, uint256 dx) external view returns (uint256);

    function get_dy_underlying(uint256 i, uint256 j, uint256 dx) external view returns (uint256);

    function get_dy(int128 i, int128 j, uint256 dx) external view returns (uint256);

    function get_dy(uint256 i, uint256 j, uint256 dx) external view returns (uint256);

    function get_virtual_price() external view returns (uint256);

    function virtual_price() external view returns (uint256);

    function token() external view returns (address);

    function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 min_amount) external;

    function remove_liquidity_one_coin(uint256 _token_amount, uint256 i, uint256 min_amount) external;

    function A() external view returns (uint256);

    function A_precise() external view returns (uint256);

    function calc_withdraw_one_coin(uint256 _burn_amount, int128 i) external view returns (uint256);

    function calc_withdraw_one_coin(uint256 _burn_amount, uint256 i) external view returns (uint256);

    function admin_balances(uint256 i) external view returns (uint256);

    function admin() external view returns (address);

    function fee() external view returns (uint256);

    function admin_fee() external view returns (uint256);

    function block_timestamp_last() external view returns (uint256);

    function initial_A() external view returns (uint256);

    function future_A() external view returns (uint256);

    function initial_A_time() external view returns (uint256);

    function future_A_time() external view returns (uint256);

    function mid_fee() external view returns (uint256);

    // Some pools implement ERC20

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint256);

    function balanceOf(address) external view returns (uint256);

    function allowance(address, address) external view returns (uint256);

    function totalSupply() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2023
pragma solidity ^0.8.17;

import {N_COINS} from "../../integrations/curve/ICurvePool_2.sol";
import {ICurveV1Adapter} from "./ICurveV1Adapter.sol";

/// @title Curve V1 2 assets adapter interface
/// @notice Implements logic allowing to interact with Curve pools with 2 assets
interface ICurveV1_2AssetsAdapter is ICurveV1Adapter {
    /// @notice Add liquidity to the pool
    /// @param amounts Amounts of tokens to add
    /// @dev `min_mint_amount` parameter is ignored because calldata is passed directly to the target contract
    function add_liquidity(uint256[N_COINS] calldata amounts, uint256) external;

    /// @notice Remove liquidity from the pool
    /// @dev '_amount' and 'min_amounts' parameters are ignored because calldata is directly passed to the target contract
    function remove_liquidity(uint256, uint256[N_COINS] calldata) external;

    /// @notice Withdraw exact amounts of tokens from the pool
    /// @param amounts Amounts of tokens to withdraw
    /// @dev `max_burn_amount` parameter is ignored because calldata is directly passed to the target contract
    function remove_liquidity_imbalance(uint256[N_COINS] calldata amounts, uint256) external;
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2023
pragma solidity ^0.8.17;

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

interface ICurveV1AdapterExceptions {
    /// @notice Thrown when trying to pass incorrect asset index as parameter to an adapter function
    error IncorrectIndexException();
}

/// @title Curve V1 base adapter interface
/// @notice Implements logic allowing to interact with all Curve pools, regardless of number of coins
interface ICurveV1Adapter is IAdapter, ICurveV1AdapterExceptions {
    /// @notice Exchanges one pool asset to another
    /// @param i Index of the asset to spend
    /// @param j Index of the asset to receive
    /// @dev `dx` and `min_dy` parameters are ignored because calldata is passed directly to the target contract
    function exchange(int128 i, int128 j, uint256, uint256) external;

    /// @notice `exchange` wrapper to support newer pools which accept uint256 for token indices
    function exchange(uint256 i, uint256 j, uint256, uint256) external;

    /// @notice Exchanges the entire balance of one pool asset to another, disables input asset
    /// @param i Index of the asset to spend
    /// @param j Index of the asset to receive
    /// @param rateMinRAY Minimum exchange rate between assets i and j, scaled by 1e27
    function exchange_all(int128 i, int128 j, uint256 rateMinRAY) external;

    /// @notice `exchange_all` wrapper to support newer pools which accept uint256 for token indices
    function exchange_all(uint256 i, uint256 j, uint256 rateMinRAY) external;

    /// @notice Exchanges one pool's underlying asset to another
    /// @param i Index of the underlying asset to spend
    /// @param j Index of the underlying asset to receive
    /// @dev `dx` and `min_dy` parameters are ignored because calldata is passed directly to the target contract
    function exchange_underlying(int128 i, int128 j, uint256, uint256) external;

    /// @notice `exchange_underlying` wrapper to support newer pools which accept uint256 for token indices
    function exchange_underlying(uint256 i, uint256 j, uint256, uint256) external;

    /// @notice Exchanges the entire balance of one pool's underlying asset to another, disables input asset
    /// @param i Index of the underlying asset to spend
    /// @param j Index of the underlying asset to receive
    /// @param rateMinRAY Minimum exchange rate between underlying assets i and j, scaled by 1e27
    function exchange_all_underlying(int128 i, int128 j, uint256 rateMinRAY) external;

    /// @notice `exchange_all_underlying` wrapper to support newer pools which accept uint256 for token indices
    function exchange_all_underlying(uint256 i, uint256 j, uint256 rateMinRAY) external;

    /// @notice Adds given amount of asset as liquidity to the pool
    /// @param amount Amount to deposit
    /// @param i Index of the asset to deposit
    /// @param minAmount Minimum amount of LP tokens to receive
    function add_liquidity_one_coin(uint256 amount, int128 i, uint256 minAmount) external;

    /// @notice `add_liquidity_one_coin` wrapper to support newer pools which accept uint256 for token indices
    function add_liquidity_one_coin(uint256 amount, uint256 i, uint256 minAmount) external;

    /// @notice Adds the entire balance of asset as liquidity to the pool, disables this asset
    /// @param i Index of the asset to deposit
    /// @param rateMinRAY Minimum exchange rate between deposited asset and LP token, scaled by 1e27
    function add_all_liquidity_one_coin(int128 i, uint256 rateMinRAY) external;

    /// @notice `add_all_liquidity_one_coin` wrapper to support newer pools which accept uint256 for token indices
    function add_all_liquidity_one_coin(uint256 i, uint256 rateMinRAY) external;

    /// @notice Removes liquidity from the pool in a specified asset
    /// @param i Index of the asset to withdraw
    /// @dev `_token_amount` and `min_amount` parameters are ignored because calldata is passed directly to the target contract
    function remove_liquidity_one_coin(uint256, int128 i, uint256) external;

    /// @notice `remove_liquidity_one_coin` wrapper to support newer pools which accept uint256 for token indices
    function remove_liquidity_one_coin(uint256, uint256 i, uint256) external;

    /// @notice Removes all liquidity from the pool in a specified asset
    /// @param i Index of the asset to withdraw
    /// @param rateMinRAY Minimum exchange rate between LP token and received token, scaled by 1e27
    function remove_all_liquidity_one_coin(int128 i, uint256 rateMinRAY) external;

    /// @notice `remove_all_liquidity_one_coin` wrapper to support newer pools which accept uint256 for token indices
    function remove_all_liquidity_one_coin(uint256 i, uint256 rateMinRAY) external;

    /// @notice Pool LP token address (added for backward compatibility)
    function token() external view returns (address);

    /// @notice Pool LP token address
    function lp_token() external view returns (address);

    /// @notice Collateral token mask of pool LP token in the credit manager
    function lpTokenMask() external view returns (uint256);

    /// @notice Base pool address (for metapools only)
    function metapoolBase() external view returns (address);

    /// @notice Number of coins in the pool
    function nCoins() external view returns (uint256);

    /// @notice Whether to use uint256 for token indexes in write functions
    function use256() external view returns (bool);

    /// @notice Token in the pool under index 0
    function token0() external view returns (address);

    /// @notice Token in the pool under index 1
    function token1() external view returns (address);

    /// @notice Token in the pool under index 2
    function token2() external view returns (address);

    /// @notice Token in the pool under index 3
    function token3() external view returns (address);

    /// @notice Collateral token mask of token0 in the credit manager
    function token0Mask() external view returns (uint256);

    /// @notice Collateral token mask of token1 in the credit manager
    function token1Mask() external view returns (uint256);

    /// @notice Collateral token mask of token2 in the credit manager
    function token2Mask() external view returns (uint256);

    /// @notice Collateral token mask of token3 in the credit manager
    function token3Mask() external view returns (uint256);

    /// @notice Underlying in the pool under index 0
    function underlying0() external view returns (address);

    /// @notice Underlying in the pool under index 1
    function underlying1() external view returns (address);

    /// @notice Underlying in the pool under index 2
    function underlying2() external view returns (address);

    /// @notice Underlying in the pool under index 3
    function underlying3() external view returns (address);

    /// @notice Collateral token mask of underlying0 in the credit manager
    function underlying0Mask() external view returns (uint256);

    /// @notice Collateral token mask of underlying1 in the credit manager
    function underlying1Mask() external view returns (uint256);

    /// @notice Collateral token mask of underlying2 in the credit manager
    function underlying2Mask() external view returns (uint256);

    /// @notice Collateral token mask of underlying3 in the credit manager
    function underlying3Mask() external view returns (uint256);

    /// @notice Returns the amount of LP token received for adding a single asset to the pool
    /// @param amount Amount to deposit
    /// @param i Index of the asset to deposit
    function calc_add_one_coin(uint256 amount, int128 i) external view returns (uint256);

    /// @notice `calc_add_one_coin` wrapper to support newer pools which accept uint256 for token indices
    function calc_add_one_coin(uint256 amount, uint256 i) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2023
pragma solidity ^0.8.17;

import {IAdapter, AdapterType} from "@gearbox-protocol/core-v2/contracts/interfaces/adapters/IAdapter.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 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 v4.8.0) (utils/math/SafeCast.sol)
// This file was procedurally generated from scripts/generate/templates/SafeCast.js.

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint248 from uint256, reverting on
     * overflow (when the input is greater than largest uint248).
     *
     * Counterpart to Solidity's `uint248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toUint248(uint256 value) internal pure returns (uint248) {
        require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits");
        return uint248(value);
    }

    /**
     * @dev Returns the downcasted uint240 from uint256, reverting on
     * overflow (when the input is greater than largest uint240).
     *
     * Counterpart to Solidity's `uint240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toUint240(uint256 value) internal pure returns (uint240) {
        require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits");
        return uint240(value);
    }

    /**
     * @dev Returns the downcasted uint232 from uint256, reverting on
     * overflow (when the input is greater than largest uint232).
     *
     * Counterpart to Solidity's `uint232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toUint232(uint256 value) internal pure returns (uint232) {
        require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits");
        return uint232(value);
    }

    /**
     * @dev Returns the downcasted uint224 from uint256, reverting on
     * overflow (when the input is greater than largest uint224).
     *
     * Counterpart to Solidity's `uint224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.2._
     */
    function toUint224(uint256 value) internal pure returns (uint224) {
        require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
        return uint224(value);
    }

    /**
     * @dev Returns the downcasted uint216 from uint256, reverting on
     * overflow (when the input is greater than largest uint216).
     *
     * Counterpart to Solidity's `uint216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toUint216(uint256 value) internal pure returns (uint216) {
        require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits");
        return uint216(value);
    }

    /**
     * @dev Returns the downcasted uint208 from uint256, reverting on
     * overflow (when the input is greater than largest uint208).
     *
     * Counterpart to Solidity's `uint208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toUint208(uint256 value) internal pure returns (uint208) {
        require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits");
        return uint208(value);
    }

    /**
     * @dev Returns the downcasted uint200 from uint256, reverting on
     * overflow (when the input is greater than largest uint200).
     *
     * Counterpart to Solidity's `uint200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toUint200(uint256 value) internal pure returns (uint200) {
        require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits");
        return uint200(value);
    }

    /**
     * @dev Returns the downcasted uint192 from uint256, reverting on
     * overflow (when the input is greater than largest uint192).
     *
     * Counterpart to Solidity's `uint192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toUint192(uint256 value) internal pure returns (uint192) {
        require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits");
        return uint192(value);
    }

    /**
     * @dev Returns the downcasted uint184 from uint256, reverting on
     * overflow (when the input is greater than largest uint184).
     *
     * Counterpart to Solidity's `uint184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toUint184(uint256 value) internal pure returns (uint184) {
        require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits");
        return uint184(value);
    }

    /**
     * @dev Returns the downcasted uint176 from uint256, reverting on
     * overflow (when the input is greater than largest uint176).
     *
     * Counterpart to Solidity's `uint176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toUint176(uint256 value) internal pure returns (uint176) {
        require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits");
        return uint176(value);
    }

    /**
     * @dev Returns the downcasted uint168 from uint256, reverting on
     * overflow (when the input is greater than largest uint168).
     *
     * Counterpart to Solidity's `uint168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toUint168(uint256 value) internal pure returns (uint168) {
        require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits");
        return uint168(value);
    }

    /**
     * @dev Returns the downcasted uint160 from uint256, reverting on
     * overflow (when the input is greater than largest uint160).
     *
     * Counterpart to Solidity's `uint160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toUint160(uint256 value) internal pure returns (uint160) {
        require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits");
        return uint160(value);
    }

    /**
     * @dev Returns the downcasted uint152 from uint256, reverting on
     * overflow (when the input is greater than largest uint152).
     *
     * Counterpart to Solidity's `uint152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toUint152(uint256 value) internal pure returns (uint152) {
        require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits");
        return uint152(value);
    }

    /**
     * @dev Returns the downcasted uint144 from uint256, reverting on
     * overflow (when the input is greater than largest uint144).
     *
     * Counterpart to Solidity's `uint144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toUint144(uint256 value) internal pure returns (uint144) {
        require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits");
        return uint144(value);
    }

    /**
     * @dev Returns the downcasted uint136 from uint256, reverting on
     * overflow (when the input is greater than largest uint136).
     *
     * Counterpart to Solidity's `uint136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toUint136(uint256 value) internal pure returns (uint136) {
        require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits");
        return uint136(value);
    }

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v2.5._
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint120 from uint256, reverting on
     * overflow (when the input is greater than largest uint120).
     *
     * Counterpart to Solidity's `uint120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toUint120(uint256 value) internal pure returns (uint120) {
        require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits");
        return uint120(value);
    }

    /**
     * @dev Returns the downcasted uint112 from uint256, reverting on
     * overflow (when the input is greater than largest uint112).
     *
     * Counterpart to Solidity's `uint112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toUint112(uint256 value) internal pure returns (uint112) {
        require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits");
        return uint112(value);
    }

    /**
     * @dev Returns the downcasted uint104 from uint256, reverting on
     * overflow (when the input is greater than largest uint104).
     *
     * Counterpart to Solidity's `uint104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toUint104(uint256 value) internal pure returns (uint104) {
        require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits");
        return uint104(value);
    }

    /**
     * @dev Returns the downcasted uint96 from uint256, reverting on
     * overflow (when the input is greater than largest uint96).
     *
     * Counterpart to Solidity's `uint96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.2._
     */
    function toUint96(uint256 value) internal pure returns (uint96) {
        require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
        return uint96(value);
    }

    /**
     * @dev Returns the downcasted uint88 from uint256, reverting on
     * overflow (when the input is greater than largest uint88).
     *
     * Counterpart to Solidity's `uint88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toUint88(uint256 value) internal pure returns (uint88) {
        require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits");
        return uint88(value);
    }

    /**
     * @dev Returns the downcasted uint80 from uint256, reverting on
     * overflow (when the input is greater than largest uint80).
     *
     * Counterpart to Solidity's `uint80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toUint80(uint256 value) internal pure returns (uint80) {
        require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits");
        return uint80(value);
    }

    /**
     * @dev Returns the downcasted uint72 from uint256, reverting on
     * overflow (when the input is greater than largest uint72).
     *
     * Counterpart to Solidity's `uint72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toUint72(uint256 value) internal pure returns (uint72) {
        require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits");
        return uint72(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v2.5._
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint56 from uint256, reverting on
     * overflow (when the input is greater than largest uint56).
     *
     * Counterpart to Solidity's `uint56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toUint56(uint256 value) internal pure returns (uint56) {
        require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits");
        return uint56(value);
    }

    /**
     * @dev Returns the downcasted uint48 from uint256, reverting on
     * overflow (when the input is greater than largest uint48).
     *
     * Counterpart to Solidity's `uint48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toUint48(uint256 value) internal pure returns (uint48) {
        require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits");
        return uint48(value);
    }

    /**
     * @dev Returns the downcasted uint40 from uint256, reverting on
     * overflow (when the input is greater than largest uint40).
     *
     * Counterpart to Solidity's `uint40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toUint40(uint256 value) internal pure returns (uint40) {
        require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits");
        return uint40(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v2.5._
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint24 from uint256, reverting on
     * overflow (when the input is greater than largest uint24).
     *
     * Counterpart to Solidity's `uint24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toUint24(uint256 value) internal pure returns (uint24) {
        require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits");
        return uint24(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v2.5._
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v2.5._
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     *
     * _Available since v3.0._
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int248 from int256, reverting on
     * overflow (when the input is less than smallest int248 or
     * greater than largest int248).
     *
     * Counterpart to Solidity's `int248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toInt248(int256 value) internal pure returns (int248 downcasted) {
        downcasted = int248(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 248 bits");
    }

    /**
     * @dev Returns the downcasted int240 from int256, reverting on
     * overflow (when the input is less than smallest int240 or
     * greater than largest int240).
     *
     * Counterpart to Solidity's `int240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toInt240(int256 value) internal pure returns (int240 downcasted) {
        downcasted = int240(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 240 bits");
    }

    /**
     * @dev Returns the downcasted int232 from int256, reverting on
     * overflow (when the input is less than smallest int232 or
     * greater than largest int232).
     *
     * Counterpart to Solidity's `int232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toInt232(int256 value) internal pure returns (int232 downcasted) {
        downcasted = int232(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 232 bits");
    }

    /**
     * @dev Returns the downcasted int224 from int256, reverting on
     * overflow (when the input is less than smallest int224 or
     * greater than largest int224).
     *
     * Counterpart to Solidity's `int224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.7._
     */
    function toInt224(int256 value) internal pure returns (int224 downcasted) {
        downcasted = int224(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 224 bits");
    }

    /**
     * @dev Returns the downcasted int216 from int256, reverting on
     * overflow (when the input is less than smallest int216 or
     * greater than largest int216).
     *
     * Counterpart to Solidity's `int216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toInt216(int256 value) internal pure returns (int216 downcasted) {
        downcasted = int216(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 216 bits");
    }

    /**
     * @dev Returns the downcasted int208 from int256, reverting on
     * overflow (when the input is less than smallest int208 or
     * greater than largest int208).
     *
     * Counterpart to Solidity's `int208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toInt208(int256 value) internal pure returns (int208 downcasted) {
        downcasted = int208(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 208 bits");
    }

    /**
     * @dev Returns the downcasted int200 from int256, reverting on
     * overflow (when the input is less than smallest int200 or
     * greater than largest int200).
     *
     * Counterpart to Solidity's `int200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toInt200(int256 value) internal pure returns (int200 downcasted) {
        downcasted = int200(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 200 bits");
    }

    /**
     * @dev Returns the downcasted int192 from int256, reverting on
     * overflow (when the input is less than smallest int192 or
     * greater than largest int192).
     *
     * Counterpart to Solidity's `int192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toInt192(int256 value) internal pure returns (int192 downcasted) {
        downcasted = int192(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 192 bits");
    }

    /**
     * @dev Returns the downcasted int184 from int256, reverting on
     * overflow (when the input is less than smallest int184 or
     * greater than largest int184).
     *
     * Counterpart to Solidity's `int184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toInt184(int256 value) internal pure returns (int184 downcasted) {
        downcasted = int184(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 184 bits");
    }

    /**
     * @dev Returns the downcasted int176 from int256, reverting on
     * overflow (when the input is less than smallest int176 or
     * greater than largest int176).
     *
     * Counterpart to Solidity's `int176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toInt176(int256 value) internal pure returns (int176 downcasted) {
        downcasted = int176(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 176 bits");
    }

    /**
     * @dev Returns the downcasted int168 from int256, reverting on
     * overflow (when the input is less than smallest int168 or
     * greater than largest int168).
     *
     * Counterpart to Solidity's `int168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toInt168(int256 value) internal pure returns (int168 downcasted) {
        downcasted = int168(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 168 bits");
    }

    /**
     * @dev Returns the downcasted int160 from int256, reverting on
     * overflow (when the input is less than smallest int160 or
     * greater than largest int160).
     *
     * Counterpart to Solidity's `int160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toInt160(int256 value) internal pure returns (int160 downcasted) {
        downcasted = int160(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 160 bits");
    }

    /**
     * @dev Returns the downcasted int152 from int256, reverting on
     * overflow (when the input is less than smallest int152 or
     * greater than largest int152).
     *
     * Counterpart to Solidity's `int152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toInt152(int256 value) internal pure returns (int152 downcasted) {
        downcasted = int152(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 152 bits");
    }

    /**
     * @dev Returns the downcasted int144 from int256, reverting on
     * overflow (when the input is less than smallest int144 or
     * greater than largest int144).
     *
     * Counterpart to Solidity's `int144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toInt144(int256 value) internal pure returns (int144 downcasted) {
        downcasted = int144(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 144 bits");
    }

    /**
     * @dev Returns the downcasted int136 from int256, reverting on
     * overflow (when the input is less than smallest int136 or
     * greater than largest int136).
     *
     * Counterpart to Solidity's `int136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toInt136(int256 value) internal pure returns (int136 downcasted) {
        downcasted = int136(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 136 bits");
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128 downcasted) {
        downcasted = int128(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 128 bits");
    }

    /**
     * @dev Returns the downcasted int120 from int256, reverting on
     * overflow (when the input is less than smallest int120 or
     * greater than largest int120).
     *
     * Counterpart to Solidity's `int120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toInt120(int256 value) internal pure returns (int120 downcasted) {
        downcasted = int120(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 120 bits");
    }

    /**
     * @dev Returns the downcasted int112 from int256, reverting on
     * overflow (when the input is less than smallest int112 or
     * greater than largest int112).
     *
     * Counterpart to Solidity's `int112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toInt112(int256 value) internal pure returns (int112 downcasted) {
        downcasted = int112(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 112 bits");
    }

    /**
     * @dev Returns the downcasted int104 from int256, reverting on
     * overflow (when the input is less than smallest int104 or
     * greater than largest int104).
     *
     * Counterpart to Solidity's `int104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toInt104(int256 value) internal pure returns (int104 downcasted) {
        downcasted = int104(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 104 bits");
    }

    /**
     * @dev Returns the downcasted int96 from int256, reverting on
     * overflow (when the input is less than smallest int96 or
     * greater than largest int96).
     *
     * Counterpart to Solidity's `int96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.7._
     */
    function toInt96(int256 value) internal pure returns (int96 downcasted) {
        downcasted = int96(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 96 bits");
    }

    /**
     * @dev Returns the downcasted int88 from int256, reverting on
     * overflow (when the input is less than smallest int88 or
     * greater than largest int88).
     *
     * Counterpart to Solidity's `int88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toInt88(int256 value) internal pure returns (int88 downcasted) {
        downcasted = int88(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 88 bits");
    }

    /**
     * @dev Returns the downcasted int80 from int256, reverting on
     * overflow (when the input is less than smallest int80 or
     * greater than largest int80).
     *
     * Counterpart to Solidity's `int80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toInt80(int256 value) internal pure returns (int80 downcasted) {
        downcasted = int80(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 80 bits");
    }

    /**
     * @dev Returns the downcasted int72 from int256, reverting on
     * overflow (when the input is less than smallest int72 or
     * greater than largest int72).
     *
     * Counterpart to Solidity's `int72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toInt72(int256 value) internal pure returns (int72 downcasted) {
        downcasted = int72(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 72 bits");
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64 downcasted) {
        downcasted = int64(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 64 bits");
    }

    /**
     * @dev Returns the downcasted int56 from int256, reverting on
     * overflow (when the input is less than smallest int56 or
     * greater than largest int56).
     *
     * Counterpart to Solidity's `int56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toInt56(int256 value) internal pure returns (int56 downcasted) {
        downcasted = int56(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 56 bits");
    }

    /**
     * @dev Returns the downcasted int48 from int256, reverting on
     * overflow (when the input is less than smallest int48 or
     * greater than largest int48).
     *
     * Counterpart to Solidity's `int48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toInt48(int256 value) internal pure returns (int48 downcasted) {
        downcasted = int48(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 48 bits");
    }

    /**
     * @dev Returns the downcasted int40 from int256, reverting on
     * overflow (when the input is less than smallest int40 or
     * greater than largest int40).
     *
     * Counterpart to Solidity's `int40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toInt40(int256 value) internal pure returns (int40 downcasted) {
        downcasted = int40(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 40 bits");
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32 downcasted) {
        downcasted = int32(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 32 bits");
    }

    /**
     * @dev Returns the downcasted int24 from int256, reverting on
     * overflow (when the input is less than smallest int24 or
     * greater than largest int24).
     *
     * Counterpart to Solidity's `int24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toInt24(int256 value) internal pure returns (int24 downcasted) {
        downcasted = int24(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 24 bits");
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16 downcasted) {
        downcasted = int16(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 16 bits");
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8 downcasted) {
        downcasted = int8(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 8 bits");
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     *
     * _Available since v3.0._
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
        require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_creditManager","type":"address"},{"internalType":"address","name":"_curvePool","type":"address"},{"internalType":"address","name":"_lp_token","type":"address"},{"internalType":"address","name":"_metapoolBase","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"CallerNotConfiguratorException","type":"error"},{"inputs":[],"name":"CreditFacadeOnlyException","type":"error"},{"inputs":[],"name":"IncorrectIndexException","type":"error"},{"inputs":[],"name":"TokenNotAllowedException","type":"error"},{"inputs":[],"name":"ZeroAddressException","type":"error"},{"inputs":[],"name":"_acl","outputs":[{"internalType":"contract IACL","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_gearboxAdapterType","outputs":[{"internalType":"enum AdapterType","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"_gearboxAdapterVersion","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"add_all_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int128","name":"i","type":"int128"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"add_all_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[2]","name":"amounts","type":"uint256[2]"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"add_liquidity","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"minAmount","type":"uint256"}],"name":"add_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"int128","name":"i","type":"int128"},{"internalType":"uint256","name":"minAmount","type":"uint256"}],"name":"add_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"addressProvider","outputs":[{"internalType":"contract IAddressProvider","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"int128","name":"i","type":"int128"}],"name":"calc_add_one_coin","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"i","type":"uint256"}],"name":"calc_add_one_coin","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"creditManager","outputs":[{"internalType":"contract ICreditManagerV2","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"int128","name":"i","type":"int128"},{"internalType":"int128","name":"j","type":"int128"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"exchange","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"j","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"exchange","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"j","type":"uint256"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"exchange_all","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int128","name":"i","type":"int128"},{"internalType":"int128","name":"j","type":"int128"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"exchange_all","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int128","name":"i","type":"int128"},{"internalType":"int128","name":"j","type":"int128"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"exchange_all_underlying","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"j","type":"uint256"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"exchange_all_underlying","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"j","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"exchange_underlying","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int128","name":"i","type":"int128"},{"internalType":"int128","name":"j","type":"int128"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"exchange_underlying","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"lpTokenMask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lp_token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"metapoolBase","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nCoins","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"int128","name":"i","type":"int128"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"remove_all_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"rateMinRAY","type":"uint256"}],"name":"remove_all_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256[2]","name":"","type":"uint256[2]"}],"name":"remove_liquidity","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[2]","name":"amounts","type":"uint256[2]"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"remove_liquidity_imbalance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"int128","name":"i","type":"int128"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"remove_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"remove_liquidity_one_coin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"targetContract","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token0","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token0Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token2","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token2Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token3","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token3Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying0","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying0Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying1Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying2","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying2Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying3","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying3Mask","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"use256","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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