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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {ERC4626} from "solmate/mixins/ERC4626.sol";
import {IStaking} from "interfaces/IStaking.sol";

import {CoolerFactory, Cooler} from "cooler/CoolerFactory.sol";
import {CoolerCallback} from "cooler/CoolerCallback.sol";

import {ROLESv1, RolesConsumer} from "modules/ROLES/OlympusRoles.sol";
import {TRSRYv1} from "modules/TRSRY/TRSRY.v1.sol";
import {MINTRv1} from "modules/MINTR/MINTR.v1.sol";
import "src/Kernel.sol";

/// @title  Olympus Clearinghouse.
/// @notice Olympus Clearinghouse (Policy) Contract.
/// @dev    The Olympus Clearinghouse is a lending facility built on top of Cooler Loans. The Clearinghouse
///         ensures that OHM holders can take loans against their gOHM holdings according to the parameters
///         approved by the community in OIP-144 and its subsequent RFCs. The Clearinghouse parameters are
///         immutable, because of that, if backing was to increase substantially, a new governance process
///         to fork this implementation with upgraded parameters should take place.
///         Although the Cooler contracts allow lenders to transfer ownership of their repayment rights, the
///         Clearinghouse doesn't implement any functions to use that feature.
contract Clearinghouse is Policy, RolesConsumer, CoolerCallback {
    // --- ERRORS ----------------------------------------------------

    error BadEscrow();
    error DurationMaximum();
    error OnlyBurnable();
    error TooEarlyToFund();
    error LengthDiscrepancy();
    error OnlyBorrower();
    error NotLender();

    // --- EVENTS ----------------------------------------------------

    /// @notice Logs whenever the Clearinghouse is deactivated.
    event Deactivate();
    /// @notice Logs whenever the Clearinghouse is reactivated.
    event Reactivate();
    /// @notice Logs whenever the treasury is defunded.
    event Defund(address token, uint256 amount);
    /// @notice Logs the balance change (in DAI terms) whenever a rebalance occurs.
    event Rebalance(bool defund, uint256 daiAmount);

    // --- RELEVANT CONTRACTS ----------------------------------------

    ERC20 public immutable dai; // Debt token
    ERC4626 public immutable sdai; // Idle DAI will be wrapped into sDAI
    ERC20 public immutable gohm; // Collateral token
    ERC20 public immutable ohm; // Unwrapped gOHM
    IStaking public immutable staking; // Necessary to unstake (and burn) OHM from defaults

    // --- MODULES ---------------------------------------------------

    TRSRYv1 public TRSRY; // Olympus V3 Treasury Module
    MINTRv1 public MINTR; // Olympus V3 Minter Module

    // --- PARAMETER BOUNDS ------------------------------------------

    uint256 public constant INTEREST_RATE = 5e15; // 0.5% anually
    uint256 public constant LOAN_TO_COLLATERAL = 289292e16; // 2,892.92 DAI/gOHM
    uint256 public constant DURATION = 121 days; // Four months
    uint256 public constant FUND_CADENCE = 7 days; // One week
    uint256 public constant FUND_AMOUNT = 18_000_000e18; // 18 million
    uint256 public constant MAX_REWARD = 1e17; // 0.1 gOHM

    // --- STATE VARIABLES -------------------------------------------

    /// @notice determines whether the contract can be funded or not.
    bool public active;

    /// @notice timestamp at which the next rebalance can occur.
    uint256 public fundTime;

    /// @notice Outstanding receivables.
    /// Incremented when a loan is taken or rolled.
    /// Decremented when a loan is repaid or collateral is burned.
    uint256 public interestReceivables;
    uint256 public principalReceivables;

    // --- INITIALIZATION --------------------------------------------

    constructor(
        address ohm_,
        address gohm_,
        address staking_,
        address sdai_,
        address coolerFactory_,
        address kernel_
    ) Policy(Kernel(kernel_)) CoolerCallback(coolerFactory_) {
        // Store the relevant contracts.
        ohm = ERC20(ohm_);
        gohm = ERC20(gohm_);
        staking = IStaking(staking_);
        sdai = ERC4626(sdai_);
        dai = ERC20(sdai.asset());

        // Initialize the contract status and its funding schedule.
        active = true;
        fundTime = block.timestamp;
    }

    /// @notice Default framework setup. Configure dependencies for olympus-v3 modules.
    /// @dev    This function will be called when the `executor` installs the Clearinghouse
    ///         policy in the olympus-v3 `Kernel`.
    function configureDependencies() external override returns (Keycode[] memory dependencies) {
        dependencies = new Keycode[](3);
        dependencies[0] = toKeycode("TRSRY");
        dependencies[1] = toKeycode("MINTR");
        dependencies[2] = toKeycode("ROLES");

        TRSRY = TRSRYv1(getModuleAddress(toKeycode("TRSRY")));
        MINTR = MINTRv1(getModuleAddress(toKeycode("MINTR")));
        ROLES = ROLESv1(getModuleAddress(toKeycode("ROLES")));

        // Approve MINTR for burning OHM (called here so that it is re-approved on updates)
        ohm.approve(address(MINTR), type(uint256).max);
    }

    /// @notice Default framework setup. Request permissions for interacting with olympus-v3 modules.
    /// @dev    This function will be called when the `executor` installs the Clearinghouse
    ///         policy in the olympus-v3 `Kernel`.
    function requestPermissions() external view override returns (Permissions[] memory requests) {
        Keycode TRSRY_KEYCODE = toKeycode("TRSRY");

        requests = new Permissions[](4);
        requests[0] = Permissions(TRSRY_KEYCODE, TRSRY.setDebt.selector);
        requests[1] = Permissions(TRSRY_KEYCODE, TRSRY.increaseWithdrawApproval.selector);
        requests[2] = Permissions(TRSRY_KEYCODE, TRSRY.withdrawReserves.selector);
        requests[3] = Permissions(toKeycode("MINTR"), MINTR.burnOhm.selector);
    }

    // --- OPERATION -------------------------------------------------

    /// @notice Lend to a cooler.
    /// @dev    To simplify the UX and easily ensure that all holders get the same terms,
    ///         this function requests a new loan and clears it in the same transaction.
    /// @param  cooler_ to lend to.
    /// @param  amount_ of DAI to lend.
    /// @return the id of the granted loan.
    function lendToCooler(Cooler cooler_, uint256 amount_) external returns (uint256) {
        // Attempt a Clearinghouse <> Treasury rebalance.
        rebalance();

        // Validate that cooler was deployed by the trusted factory.
        if (!factory.created(address(cooler_))) revert OnlyFromFactory();

        // Validate cooler collateral and debt tokens.
        if (cooler_.collateral() != gohm || cooler_.debt() != dai) revert BadEscrow();

        // Transfer in collateral owed
        uint256 collateral = cooler_.collateralFor(amount_, LOAN_TO_COLLATERAL);
        gohm.transferFrom(msg.sender, address(this), collateral);

        // Increment interest to be expected
        (, uint256 interest) = getLoanForCollateral(collateral);
        interestReceivables += interest;
        principalReceivables += amount_;

        // Create a new loan request.
        gohm.approve(address(cooler_), collateral);
        uint256 reqID = cooler_.requestLoan(amount_, INTEREST_RATE, LOAN_TO_COLLATERAL, DURATION);

        // Clear the created loan request by providing enough DAI.
        sdai.withdraw(amount_, address(this), address(this));
        dai.approve(address(cooler_), amount_);
        uint256 loanID = cooler_.clearRequest(reqID, address(this), true);

        return loanID;
    }

    /// @notice Extend the loan expiry by repaying the extension interest in advance.
    ///         The extension cost is paid by the caller. If a third-party executes the
    ///         extension, the loan period is extended, but the borrower debt does not increase.
    /// @param  cooler_ holding the loan to be extended.
    /// @param  loanID_ index of loan in loans[].
    /// @param  times_ Amount of times that the fixed-term loan duration is extended.
    function extendLoan(Cooler cooler_, uint256 loanID_, uint8 times_) external {
        Cooler.Loan memory loan = cooler_.getLoan(loanID_);

        // Validate that cooler was deployed by the trusted factory.
        if (!factory.created(address(cooler_))) revert OnlyFromFactory();

        // Calculate extension interest based on the remaining principal.
        uint256 interestBase = interestForLoan(loan.principal, loan.request.duration);

        // Transfer in extension interest from the caller.
        dai.transferFrom(msg.sender, address(this), interestBase * times_);
        if (active) {
            _sweepIntoDSR(interestBase * times_);
        } else {
            _defund(dai, interestBase * times_);
        }

        // Signal to cooler that loan should be extended.
        cooler_.extendLoanTerms(loanID_, times_);
    }

    /// @notice Batch several default claims to save gas.
    ///         The elements on both arrays must be paired based on their index.
    /// @dev    Implements an auction style reward system that linearly increases up to a max reward.
    /// @param  coolers_ Array of contracts where the default must be claimed.
    /// @param  loans_ Array of defaulted loan ids.
    function claimDefaulted(address[] calldata coolers_, uint256[] calldata loans_) external {
        uint256 loans = loans_.length;
        if (loans != coolers_.length) revert LengthDiscrepancy();

        uint256 totalPrincipal;
        uint256 totalInterest;
        uint256 totalCollateral;
        uint256 keeperRewards;
        for (uint256 i = 0; i < loans; ) {
            // Validate that cooler was deployed by the trusted factory.
            if (!factory.created(coolers_[i])) revert OnlyFromFactory();

            // Validate that loan was written by clearinghouse.
            if (Cooler(coolers_[i]).getLoan(loans_[i]).lender != address(this)) revert NotLender();

            // Claim defaults and update cached metrics.
            (uint256 principal, uint256 interest, uint256 collateral, uint256 elapsed) = Cooler(
                coolers_[i]
            ).claimDefaulted(loans_[i]);

            unchecked {
                // Cannot overflow due to max supply limits for both tokens
                totalPrincipal += principal;
                totalInterest += interest;
                totalCollateral += collateral;
                // There will not exist more than 2**256 loans
                ++i;
            }

            // Cap rewards to 5% of the collateral to avoid OHM holder's dillution.
            uint256 maxAuctionReward = (collateral * 5e16) / 1e18;

            // Cap rewards to avoid exorbitant amounts.
            uint256 maxReward = (maxAuctionReward < MAX_REWARD) ? maxAuctionReward : MAX_REWARD;

            // Calculate rewards based on the elapsed time since default.
            keeperRewards = (elapsed < 7 days)
                ? keeperRewards + (maxReward * elapsed) / 7 days
                : keeperRewards + maxReward;
        }

        // Decrement loan receivables.
        interestReceivables = (interestReceivables > totalInterest)
            ? interestReceivables - totalInterest
            : 0;
        principalReceivables = (principalReceivables > totalPrincipal)
            ? principalReceivables - totalPrincipal
            : 0;

        // Update outstanding debt owed to the Treasury upon default.
        uint256 outstandingDebt = TRSRY.reserveDebt(dai, address(this));

        // debt owed to TRSRY = user debt - user interest
        TRSRY.setDebt({
            debtor_: address(this),
            token_: dai,
            amount_: (outstandingDebt > totalPrincipal) ? outstandingDebt - totalPrincipal : 0
        });

        // Reward keeper.
        gohm.transfer(msg.sender, keeperRewards);
        // Burn the outstanding collateral of defaulted loans.
        burn();
    }

    // --- CALLBACKS -----------------------------------------------------

    /// @notice Overridden callback to decrement loan receivables.
    /// @param *unused loadID_ of the load.
    /// @param  principalPaid_ in DAI.
    /// @param  interestPaid_ in DAI.
    function _onRepay(uint256, uint256 principalPaid_, uint256 interestPaid_) internal override {
        if (active) {
            _sweepIntoDSR(principalPaid_ + interestPaid_);
        } else {
            _defund(dai, principalPaid_ + interestPaid_);
        }

        // Decrement loan receivables.
        interestReceivables = (interestReceivables > interestPaid_)
            ? interestReceivables - interestPaid_
            : 0;
        principalReceivables = (principalReceivables > principalPaid_)
            ? principalReceivables - principalPaid_
            : 0;
    }

    /// @notice Unused callback since defaults are handled by the clearinghouse.
    /// @dev    Overriden and left empty to save gas.
    function _onDefault(uint256, uint256, uint256, uint256) internal override {}

    // --- FUNDING ---------------------------------------------------

    /// @notice Fund loan liquidity from treasury.
    /// @dev    Exposure is always capped at FUND_AMOUNT and rebalanced at up to FUND_CADANCE.
    ///         If several rebalances are available (because some were missed), calling this
    ///         function several times won't impact the funds controlled by the contract.
    ///         If the emergency shutdown is triggered, a rebalance will send funds back to
    ///         the treasury.
    /// @return False if too early to rebalance. Otherwise, true.
    function rebalance() public returns (bool) {
        // If the contract is deactivated, defund.
        uint256 maxFundAmount = active ? FUND_AMOUNT : 0;
        // Update funding schedule if necessary.
        if (fundTime > block.timestamp) return false;
        fundTime += FUND_CADENCE;

        // Sweep DAI into DSR if necessary.
        uint256 idle = dai.balanceOf(address(this));
        if (idle != 0) _sweepIntoDSR(idle);

        uint256 daiBalance = sdai.maxWithdraw(address(this));
        uint256 outstandingDebt = TRSRY.reserveDebt(dai, address(this));
        // Rebalance funds on hand with treasury's reserves.
        if (daiBalance < maxFundAmount) {
            // Since users loans are denominated in DAI, the clearinghouse
            // debt is set in DAI terms. It must be adjusted when funding.
            uint256 fundAmount = maxFundAmount - daiBalance;
            TRSRY.setDebt({
                debtor_: address(this),
                token_: dai,
                amount_: outstandingDebt + fundAmount
            });

            // Since TRSRY holds sDAI, a conversion must be done before
            // funding the clearinghouse.
            uint256 sdaiAmount = sdai.previewWithdraw(fundAmount);
            TRSRY.increaseWithdrawApproval(address(this), sdai, sdaiAmount);
            TRSRY.withdrawReserves(address(this), sdai, sdaiAmount);

            // Log the event.
            emit Rebalance(false, fundAmount);
        } else if (daiBalance > maxFundAmount) {
            // Since users loans are denominated in DAI, the clearinghouse
            // debt is set in DAI terms. It must be adjusted when defunding.
            uint256 defundAmount = daiBalance - maxFundAmount;
            TRSRY.setDebt({
                debtor_: address(this),
                token_: dai,
                amount_: (outstandingDebt > defundAmount) ? outstandingDebt - defundAmount : 0
            });

            // Since TRSRY holds sDAI, a conversion must be done before
            // sending sDAI back.
            uint256 sdaiAmount = sdai.previewWithdraw(defundAmount);
            sdai.transfer(address(TRSRY), sdaiAmount);

            // Log the event.
            emit Rebalance(true, defundAmount);
        }

        return true;
    }

    /// @notice Sweep excess DAI into vault.
    function sweepIntoDSR() public {
        uint256 daiBalance = dai.balanceOf(address(this));
        _sweepIntoDSR(daiBalance);
    }

    /// @notice Sweep excess DAI into vault.
    function _sweepIntoDSR(uint256 amount_) internal {
        dai.approve(address(sdai), amount_);
        sdai.deposit(amount_, address(this));
    }

    /// @notice Return funds to treasury.
    /// @param  token_ to transfer.
    /// @param  amount_ to transfer.
    function defund(ERC20 token_, uint256 amount_) external onlyRole("cooler_overseer") {
        if (token_ == gohm) revert OnlyBurnable();
        _defund(token_, amount_);
    }

    /// @notice Internal function to return funds to treasury.
    /// @param  token_ to transfer.
    /// @param  amount_ to transfer.
    function _defund(ERC20 token_, uint256 amount_) internal {
        if (token_ == sdai || token_ == dai) {
            // Since users loans are denominated in DAI, the clearinghouse
            // debt is set in DAI terms. It must be adjusted when defunding.
            uint256 outstandingDebt = TRSRY.reserveDebt(dai, address(this));
            uint256 daiAmount = (token_ == sdai) ? sdai.previewRedeem(amount_) : amount_;

            TRSRY.setDebt({
                debtor_: address(this),
                token_: dai,
                amount_: (outstandingDebt > daiAmount) ? outstandingDebt - daiAmount : 0
            });
        }

        // Defund and log the event
        token_.transfer(address(TRSRY), amount_);
        emit Defund(address(token_), amount_);
    }

    /// @notice Public function to burn gOHM.
    /// @dev    Can be used to burn any gOHM defaulted using the Cooler instead of the Clearinghouse.
    function burn() public {
        uint256 gohmBalance = gohm.balanceOf(address(this));
        // Unstake and burn gOHM holdings.
        gohm.approve(address(staking), gohmBalance);
        MINTR.burnOhm(address(this), staking.unstake(address(this), gohmBalance, false, false));
    }

    /// @notice Deactivate the contract and return funds to treasury.
    function emergencyShutdown() external onlyRole("emergency_shutdown") {
        active = false;

        // If necessary, defund sDAI.
        uint256 sdaiBalance = sdai.balanceOf(address(this));
        if (sdaiBalance != 0) _defund(sdai, sdaiBalance);

        // If necessary, defund DAI.
        uint256 daiBalance = dai.balanceOf(address(this));
        if (daiBalance != 0) _defund(dai, daiBalance);

        emit Deactivate();
    }

    /// @notice Reactivate the contract.
    function reactivate() external onlyRole("cooler_overseer") {
        active = true;
        fundTime = block.timestamp;

        emit Reactivate();
    }

    // --- AUX FUNCTIONS ---------------------------------------------

    /// @notice view function computing collateral for a loan amount.
    function getCollateralForLoan(uint256 principal_) external pure returns (uint256) {
        return (principal_ * 1e18) / LOAN_TO_COLLATERAL;
    }

    /// @notice view function computing loan for a collateral amount.
    /// @param  collateral_ amount of gOHM.
    /// @return debt (amount to be lent + interest) for a given collateral amount.
    function getLoanForCollateral(uint256 collateral_) public pure returns (uint256, uint256) {
        uint256 principal = (collateral_ * LOAN_TO_COLLATERAL) / 1e18;
        uint256 interest = interestForLoan(principal, DURATION);
        return (principal, interest);
    }

    /// @notice view function to compute the interest for given principal amount.
    /// @param principal_ amount of DAI being lent.
    /// @param duration_ elapsed time in seconds.
    function interestForLoan(uint256 principal_, uint256 duration_) public pure returns (uint256) {
        uint256 interestPercent = (INTEREST_RATE * duration_) / 365 days;
        return (principal_ * interestPercent) / 1e18;
    }

    /// @notice Get total receivable DAI for the treasury.
    ///         Includes both principal and interest.
    function getTotalReceivables() external view returns (uint256) {
        return principalReceivables + interestReceivables;
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

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

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";
import {SafeTransferLib} from "../utils/SafeTransferLib.sol";
import {FixedPointMathLib} from "../utils/FixedPointMathLib.sol";

/// @notice Minimal ERC4626 tokenized Vault implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/mixins/ERC4626.sol)
abstract contract ERC4626 is ERC20 {
    using SafeTransferLib for ERC20;
    using FixedPointMathLib for uint256;

    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Deposit(address indexed caller, address indexed owner, uint256 assets, uint256 shares);

    event Withdraw(
        address indexed caller,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /*//////////////////////////////////////////////////////////////
                               IMMUTABLES
    //////////////////////////////////////////////////////////////*/

    ERC20 public immutable asset;

    constructor(
        ERC20 _asset,
        string memory _name,
        string memory _symbol
    ) ERC20(_name, _symbol, _asset.decimals()) {
        asset = _asset;
    }

    /*//////////////////////////////////////////////////////////////
                        DEPOSIT/WITHDRAWAL LOGIC
    //////////////////////////////////////////////////////////////*/

    function deposit(uint256 assets, address receiver) public virtual returns (uint256 shares) {
        // Check for rounding error since we round down in previewDeposit.
        require((shares = previewDeposit(assets)) != 0, "ZERO_SHARES");

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assets);

        _mint(receiver, shares);

        emit Deposit(msg.sender, receiver, assets, shares);

        afterDeposit(assets, shares);
    }

    function mint(uint256 shares, address receiver) public virtual returns (uint256 assets) {
        assets = previewMint(shares); // No need to check for rounding error, previewMint rounds up.

        // Need to transfer before minting or ERC777s could reenter.
        asset.safeTransferFrom(msg.sender, address(this), assets);

        _mint(receiver, shares);

        emit Deposit(msg.sender, receiver, assets, shares);

        afterDeposit(assets, shares);
    }

    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) public virtual returns (uint256 shares) {
        shares = previewWithdraw(assets); // No need to check for rounding error, previewWithdraw rounds up.

        if (msg.sender != owner) {
            uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals.

            if (allowed != type(uint256).max) allowance[owner][msg.sender] = allowed - shares;
        }

        beforeWithdraw(assets, shares);

        _burn(owner, shares);

        emit Withdraw(msg.sender, receiver, owner, assets, shares);

        asset.safeTransfer(receiver, assets);
    }

    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) public virtual returns (uint256 assets) {
        if (msg.sender != owner) {
            uint256 allowed = allowance[owner][msg.sender]; // Saves gas for limited approvals.

            if (allowed != type(uint256).max) allowance[owner][msg.sender] = allowed - shares;
        }

        // Check for rounding error since we round down in previewRedeem.
        require((assets = previewRedeem(shares)) != 0, "ZERO_ASSETS");

        beforeWithdraw(assets, shares);

        _burn(owner, shares);

        emit Withdraw(msg.sender, receiver, owner, assets, shares);

        asset.safeTransfer(receiver, assets);
    }

    /*//////////////////////////////////////////////////////////////
                            ACCOUNTING LOGIC
    //////////////////////////////////////////////////////////////*/

    function totalAssets() public view virtual returns (uint256);

    function convertToShares(uint256 assets) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? assets : assets.mulDivDown(supply, totalAssets());
    }

    function convertToAssets(uint256 shares) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? shares : shares.mulDivDown(totalAssets(), supply);
    }

    function previewDeposit(uint256 assets) public view virtual returns (uint256) {
        return convertToShares(assets);
    }

    function previewMint(uint256 shares) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? shares : shares.mulDivUp(totalAssets(), supply);
    }

    function previewWithdraw(uint256 assets) public view virtual returns (uint256) {
        uint256 supply = totalSupply; // Saves an extra SLOAD if totalSupply is non-zero.

        return supply == 0 ? assets : assets.mulDivUp(supply, totalAssets());
    }

    function previewRedeem(uint256 shares) public view virtual returns (uint256) {
        return convertToAssets(shares);
    }

    /*//////////////////////////////////////////////////////////////
                     DEPOSIT/WITHDRAWAL LIMIT LOGIC
    //////////////////////////////////////////////////////////////*/

    function maxDeposit(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    function maxMint(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    function maxWithdraw(address owner) public view virtual returns (uint256) {
        return convertToAssets(balanceOf[owner]);
    }

    function maxRedeem(address owner) public view virtual returns (uint256) {
        return balanceOf[owner];
    }

    /*//////////////////////////////////////////////////////////////
                          INTERNAL HOOKS LOGIC
    //////////////////////////////////////////////////////////////*/

    function beforeWithdraw(uint256 assets, uint256 shares) internal virtual {}

    function afterDeposit(uint256 assets, uint256 shares) internal virtual {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IStaking {
    function unstake(
        address to,
        uint256 amount,
        bool trigger,
        bool rebasing
    ) external returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {ClonesWithImmutableArgs} from "clones/ClonesWithImmutableArgs.sol";

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

/// @title  Cooler Loans Factory.
/// @notice The Cooler Factory creates new Cooler escrow contracts.
/// @dev    This contract uses Clones (https://github.com/wighawag/clones-with-immutable-args)
///         to save gas on deployment.
contract CoolerFactory {
    using ClonesWithImmutableArgs for address;

    // --- ERRORS ----------------------------------------------------

    error NotFromFactory();
    error DecimalsNot18();

    // --- EVENTS ----------------------------------------------------

    /// @notice A global event when a new loan request is created.
    event RequestLoan(address indexed cooler, address collateral, address debt, uint256 reqID);
    /// @notice A global event when a loan request is rescinded.
    event RescindRequest(address indexed cooler, uint256 reqID);
    /// @notice A global event when a loan request is fulfilled.
    event ClearRequest(address indexed cooler, uint256 reqID, uint256 loanID);
    /// @notice A global event when a loan is repaid.
    event RepayLoan(address indexed cooler, uint256 loanID, uint256 amount);
    /// @notice A global event when a loan is extended.
    event ExtendLoan(address indexed cooler, uint256 loanID, uint8 times);
    /// @notice A global event when the collateral of defaulted loan is claimed.
    event DefaultLoan(address indexed cooler, uint256 loanID, uint256 amount);

    // -- STATE VARIABLES --------------------------------------------

    /// @notice Cooler reference implementation (deployed on creation to clone from).
    Cooler public immutable coolerImplementation;

    /// @notice Mapping to validate deployed coolers.
    mapping(address => bool) public created;

    /// @notice Mapping to prevent duplicate coolers.
    mapping(address => mapping(ERC20 => mapping(ERC20 => address))) private coolerFor;

    /// @notice Mapping to query Coolers for Collateral-Debt pair.
    mapping(ERC20 => mapping(ERC20 => address[])) public coolersFor;

    // --- INITIALIZATION --------------------------------------------

    constructor() {
        coolerImplementation = new Cooler();
    }

    // --- DEPLOY NEW COOLERS ----------------------------------------

    /// @notice creates a new Escrow contract for collateral and debt tokens.
    /// @param  collateral_ the token given as collateral.
    /// @param  debt_ the token to be lent. Interest is denominated in debt tokens.
    /// @return cooler address of the contract.
function generateCooler(ERC20 collateral_, ERC20 debt_) external returns (address cooler) {
    // Return address if cooler exists.
    cooler = coolerFor[msg.sender][collateral_][debt_];

    // Otherwise generate new cooler.
    if (cooler == address(0)) {
        if (collateral_.decimals() != 18 || debt_.decimals() != 18) revert DecimalsNot18();
        // Clone the cooler implementation.
        bytes memory coolerData = abi.encodePacked(
            msg.sender,              // owner
            address(collateral_),    // collateral
            address(debt_),          // debt
            address(this)            // factory
        );
        cooler = address(coolerImplementation).clone(coolerData);

        // Update storage accordingly.
        coolerFor[msg.sender][collateral_][debt_] = cooler;
        coolersFor[collateral_][debt_].push(cooler);
        created[cooler] = true;
    }
}

    // --- EMIT EVENTS -----------------------------------------------

    /// @notice Ensure that the called is a Cooler.
    modifier onlyFromFactory {        
        if (!created[msg.sender]) revert NotFromFactory();
        _;
    }

    /// @notice Emit a global event when a new loan request is created.
    function logRequestLoan(uint256 reqID_) external onlyFromFactory {
        emit RequestLoan(msg.sender, address(Cooler(msg.sender).collateral()), address(Cooler(msg.sender).debt()), reqID_);
    }

    /// @notice Emit a global event when a loan request is rescinded.
    function logRescindRequest(uint256 reqID_) external onlyFromFactory {
        emit RescindRequest(msg.sender, reqID_);
    }

    /// @notice Emit a global event when a loan request is fulfilled.
    function logClearRequest(uint256 reqID_, uint256 loanID_) external onlyFromFactory {
        emit ClearRequest(msg.sender, reqID_, loanID_);
    }

    /// @notice Emit a global event when a loan is repaid.
    function logRepayLoan(uint256 loanID_, uint256 repayment_) external onlyFromFactory {
        emit RepayLoan(msg.sender, loanID_, repayment_);
    }

    /// @notice Emit a global event when a loan is extended.
    function logExtendLoan(uint256 loanID_, uint8 times_) external onlyFromFactory {
        emit ExtendLoan(msg.sender, loanID_, times_);
    }

    /// @notice Emit a global event when the collateral of defaulted loan is claimed.
    function logDefaultLoan(uint256 loanID_, uint256 collateral_) external onlyFromFactory {
        emit DefaultLoan(msg.sender, loanID_, collateral_);
    }

    // --- AUX FUNCTIONS ---------------------------------------------

    /// @notice Getter function to get an existing cooler for a given user <> collateral <> debt combination.
    function getCoolerFor(address user_, address collateral_, address debt_) public view returns (address) {
        return coolerFor[user_][ERC20(collateral_)][ERC20(debt_)];
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

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

/// @notice Allows for debt issuers to execute logic when a loan is repaid, rolled, or defaulted.
/// @dev    The three callback functions must be implemented if `isCoolerCallback()` is set to true.
abstract contract CoolerCallback {
    // --- ERRORS ----------------------------------------------------

    error OnlyFromFactory();

    // --- INITIALIZATION --------------------------------------------

    CoolerFactory public immutable factory;

    constructor(address coolerFactory_) {
        factory = CoolerFactory(coolerFactory_);
    }

    // --- EXTERNAL FUNCTIONS ------------------------------------------------

    /// @notice Informs to Cooler that this contract can handle its callbacks.
    function isCoolerCallback() external pure returns (bool) {
        return true;
    }

    /// @notice Callback function that handles repayments.
    function onRepay(uint256 loanID_, uint256 principlePaid_, uint256 interestPaid_) external {
        if (!factory.created(msg.sender)) revert OnlyFromFactory();
        _onRepay(loanID_, principlePaid_, interestPaid_);
    }

    /// @notice Callback function that handles defaults.
    function onDefault(
        uint256 loanID_,
        uint256 principle,
        uint256 interest,
        uint256 collateral
    ) external {
        if (!factory.created(msg.sender)) revert OnlyFromFactory();
        _onDefault(loanID_, principle, interest, collateral);
    }

    // --- INTERNAL FUNCTIONS ------------------------------------------------

    /// @notice Callback function that handles repayments. Override for custom logic.
    function _onRepay(
        uint256 loanID_,
        uint256 principlePaid_,
        uint256 interestPaid_
    ) internal virtual;

    /// @notice Callback function that handles defaults.
    function _onDefault(
        uint256 loanID_,
        uint256 principle_,
        uint256 interestDue_,
        uint256 collateral
    ) internal virtual;
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

import {ROLESv1} from "src/modules/ROLES/ROLES.v1.sol";
import "src/Kernel.sol";

/// @notice Abstract contract to have the `onlyRole` modifier
/// @dev    Inheriting this automatically makes ROLES module a dependency
abstract contract RolesConsumer {
    ROLESv1 public ROLES;

    modifier onlyRole(bytes32 role_) {
        ROLES.requireRole(role_, msg.sender);
        _;
    }
}

/// @notice Module that holds multisig roles needed by various policies.
contract OlympusRoles is ROLESv1 {
    //============================================================================================//
    //                                        MODULE SETUP                                        //
    //============================================================================================//

    constructor(Kernel kernel_) Module(kernel_) {}

    /// @inheritdoc Module
    function KEYCODE() public pure override returns (Keycode) {
        return toKeycode("ROLES");
    }

    /// @inheritdoc Module
    function VERSION() external pure override returns (uint8 major, uint8 minor) {
        major = 1;
        minor = 0;
    }

    //============================================================================================//
    //                                       CORE FUNCTIONS                                       //
    //============================================================================================//

    /// @inheritdoc ROLESv1
    function saveRole(bytes32 role_, address addr_) external override permissioned {
        if (hasRole[addr_][role_]) revert ROLES_AddressAlreadyHasRole(addr_, role_);

        ensureValidRole(role_);

        // Grant role to the address
        hasRole[addr_][role_] = true;

        emit RoleGranted(role_, addr_);
    }

    /// @inheritdoc ROLESv1
    function removeRole(bytes32 role_, address addr_) external override permissioned {
        if (!hasRole[addr_][role_]) revert ROLES_AddressDoesNotHaveRole(addr_, role_);

        hasRole[addr_][role_] = false;

        emit RoleRevoked(role_, addr_);
    }

    //============================================================================================//
    //                                       VIEW FUNCTIONS                                       //
    //============================================================================================//

    /// @inheritdoc ROLESv1
    function requireRole(bytes32 role_, address caller_) external view override {
        if (!hasRole[caller_][role_]) revert ROLES_RequireRole(role_);
    }

    /// @inheritdoc ROLESv1
    function ensureValidRole(bytes32 role_) public pure override {
        for (uint256 i = 0; i < 32; ) {
            bytes1 char = role_[i];
            if ((char < 0x61 || char > 0x7A) && char != 0x5f && char != 0x00) {
                revert ROLES_InvalidRole(role_); // a-z only
            }
            unchecked {
                i++;
            }
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

import {ERC20} from "solmate/tokens/ERC20.sol";
import "src/Kernel.sol";

/// @notice Treasury holds all other assets under the control of the protocol.
abstract contract TRSRYv1 is Module {
    // =========  EVENTS ========= //

    event IncreaseWithdrawApproval(
        address indexed withdrawer_,
        ERC20 indexed token_,
        uint256 newAmount_
    );
    event DecreaseWithdrawApproval(
        address indexed withdrawer_,
        ERC20 indexed token_,
        uint256 newAmount_
    );
    event Withdrawal(
        address indexed policy_,
        address indexed withdrawer_,
        ERC20 indexed token_,
        uint256 amount_
    );
    event IncreaseDebtorApproval(address indexed debtor_, ERC20 indexed token_, uint256 newAmount_);
    event DecreaseDebtorApproval(address indexed debtor_, ERC20 indexed token_, uint256 newAmount_);
    event DebtIncurred(ERC20 indexed token_, address indexed policy_, uint256 amount_);
    event DebtRepaid(ERC20 indexed token_, address indexed policy_, uint256 amount_);
    event DebtSet(ERC20 indexed token_, address indexed policy_, uint256 amount_);

    // =========  ERRORS ========= //

    error TRSRY_NoDebtOutstanding();
    error TRSRY_NotActive();

    // =========  STATE ========= //

    /// @notice Status of the treasury. If false, no withdrawals or debt can be incurred.
    bool public active;

    /// @notice Mapping of who is approved for withdrawal.
    /// @dev    withdrawer -> token -> amount. Infinite approval is max(uint256).
    mapping(address => mapping(ERC20 => uint256)) public withdrawApproval;

    /// @notice Mapping of who is approved to incur debt.
    /// @dev    debtor -> token -> amount. Infinite approval is max(uint256).
    mapping(address => mapping(ERC20 => uint256)) public debtApproval;

    /// @notice Total debt for token across all withdrawals.
    mapping(ERC20 => uint256) public totalDebt;

    /// @notice Debt for particular token and debtor address
    mapping(ERC20 => mapping(address => uint256)) public reserveDebt;

    // =========  FUNCTIONS ========= //

    modifier onlyWhileActive() {
        if (!active) revert TRSRY_NotActive();
        _;
    }

    /// @notice Increase approval for specific withdrawer addresses
    function increaseWithdrawApproval(
        address withdrawer_,
        ERC20 token_,
        uint256 amount_
    ) external virtual;

    /// @notice Decrease approval for specific withdrawer addresses
    function decreaseWithdrawApproval(
        address withdrawer_,
        ERC20 token_,
        uint256 amount_
    ) external virtual;

    /// @notice Allow withdrawal of reserve funds from pre-approved addresses.
    function withdrawReserves(address to_, ERC20 token_, uint256 amount_) external virtual;

    /// @notice Increase approval for someone to accrue debt in order to withdraw reserves.
    /// @dev    Debt will generally be taken by contracts to allocate treasury funds in yield sources.
    function increaseDebtorApproval(
        address debtor_,
        ERC20 token_,
        uint256 amount_
    ) external virtual;

    /// @notice Decrease approval for someone to withdraw reserves as debt.
    function decreaseDebtorApproval(
        address debtor_,
        ERC20 token_,
        uint256 amount_
    ) external virtual;

    /// @notice Pre-approved policies can get a loan to perform operations with treasury assets.
    function incurDebt(ERC20 token_, uint256 amount_) external virtual;

    /// @notice Repay a debtor debt.
    /// @dev    Only confirmed to safely handle standard and non-standard ERC20s.
    /// @dev    Can have unforeseen consequences with ERC777. Be careful with ERC777 as reserve.
    function repayDebt(address debtor_, ERC20 token_, uint256 amount_) external virtual;

    /// @notice An escape hatch for setting debt in special cases, like swapping reserves to another token.
    function setDebt(address debtor_, ERC20 token_, uint256 amount_) external virtual;

    /// @notice Get total balance of assets inside the treasury + any debt taken out against those assets.
    function getReserveBalance(ERC20 token_) external view virtual returns (uint256);

    /// @notice Emergency shutdown of withdrawals.
    function deactivate() external virtual;

    /// @notice Re-activate withdrawals after shutdown.
    function activate() external virtual;
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

import {OlympusERC20Token as OHM} from "src/external/OlympusERC20.sol";
import "src/Kernel.sol";

/// @notice Wrapper for minting and burning functions of OHM token.
abstract contract MINTRv1 is Module {
    // =========  EVENTS ========= //

    event IncreaseMintApproval(address indexed policy_, uint256 newAmount_);
    event DecreaseMintApproval(address indexed policy_, uint256 newAmount_);
    event Mint(address indexed policy_, address indexed to_, uint256 amount_);
    event Burn(address indexed policy_, address indexed from_, uint256 amount_);

    // ========= ERRORS ========= //

    error MINTR_NotApproved();
    error MINTR_ZeroAmount();
    error MINTR_NotActive();

    // =========  STATE ========= //

    OHM public ohm;

    /// @notice Status of the minter. If false, minting and burning OHM is disabled.
    bool public active;

    /// @notice Mapping of who is approved for minting.
    /// @dev    minter -> amount. Infinite approval is max(uint256).
    mapping(address => uint256) public mintApproval;

    // =========  FUNCTIONS ========= //

    modifier onlyWhileActive() {
        if (!active) revert MINTR_NotActive();
        _;
    }

    /// @notice Mint OHM to an address.
    function mintOhm(address to_, uint256 amount_) external virtual;

    /// @notice Burn OHM from an address. Must have approval.
    function burnOhm(address from_, uint256 amount_) external virtual;

    /// @notice Increase approval for specific withdrawer addresses
    /// @dev    Policies must explicity request how much they want approved before withdrawing.
    function increaseMintApproval(address policy_, uint256 amount_) external virtual;

    /// @notice Decrease approval for specific withdrawer addresses
    function decreaseMintApproval(address policy_, uint256 amount_) external virtual;

    /// @notice Emergency shutdown of minting and burning.
    function deactivate() external virtual;

    /// @notice Re-activate minting and burning after shutdown.
    function activate() external virtual;
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

//     ███████    █████       █████ █████ ██████   ██████ ███████████  █████  █████  █████████
//   ███░░░░░███ ░░███       ░░███ ░░███ ░░██████ ██████ ░░███░░░░░███░░███  ░░███  ███░░░░░███
//  ███     ░░███ ░███        ░░███ ███   ░███░█████░███  ░███    ░███ ░███   ░███ ░███    ░░░
// ░███      ░███ ░███         ░░█████    ░███░░███ ░███  ░██████████  ░███   ░███ ░░█████████
// ░███      ░███ ░███          ░░███     ░███ ░░░  ░███  ░███░░░░░░   ░███   ░███  ░░░░░░░░███
// ░░███     ███  ░███      █    ░███     ░███      ░███  ░███         ░███   ░███  ███    ░███
//  ░░░███████░   ███████████    █████    █████     █████ █████        ░░████████  ░░█████████
//    ░░░░░░░    ░░░░░░░░░░░    ░░░░░    ░░░░░     ░░░░░ ░░░░░          ░░░░░░░░    ░░░░░░░░░

//============================================================================================//
//                                        GLOBAL TYPES                                        //
//============================================================================================//

/// @notice Actions to trigger state changes in the kernel. Passed by the executor
enum Actions {
    InstallModule,
    UpgradeModule,
    ActivatePolicy,
    DeactivatePolicy,
    ChangeExecutor,
    MigrateKernel
}

/// @notice Used by executor to select an action and a target contract for a kernel action
struct Instruction {
    Actions action;
    address target;
}

/// @notice Used to define which module functions a policy needs access to
struct Permissions {
    Keycode keycode;
    bytes4 funcSelector;
}

type Keycode is bytes5;

//============================================================================================//
//                                       UTIL FUNCTIONS                                       //
//============================================================================================//

error TargetNotAContract(address target_);
error InvalidKeycode(Keycode keycode_);

// solhint-disable-next-line func-visibility
function toKeycode(bytes5 keycode_) pure returns (Keycode) {
    return Keycode.wrap(keycode_);
}

// solhint-disable-next-line func-visibility
function fromKeycode(Keycode keycode_) pure returns (bytes5) {
    return Keycode.unwrap(keycode_);
}

// solhint-disable-next-line func-visibility
function ensureContract(address target_) view {
    if (target_.code.length == 0) revert TargetNotAContract(target_);
}

// solhint-disable-next-line func-visibility
function ensureValidKeycode(Keycode keycode_) pure {
    bytes5 unwrapped = Keycode.unwrap(keycode_);
    for (uint256 i = 0; i < 5; ) {
        bytes1 char = unwrapped[i];
        if (char < 0x41 || char > 0x5A) revert InvalidKeycode(keycode_); // A-Z only
        unchecked {
            i++;
        }
    }
}

//============================================================================================//
//                                        COMPONENTS                                          //
//============================================================================================//

/// @notice Generic adapter interface for kernel access in modules and policies.
abstract contract KernelAdapter {
    error KernelAdapter_OnlyKernel(address caller_);

    Kernel public kernel;

    constructor(Kernel kernel_) {
        kernel = kernel_;
    }

    /// @notice Modifier to restrict functions to be called only by kernel.
    modifier onlyKernel() {
        if (msg.sender != address(kernel)) revert KernelAdapter_OnlyKernel(msg.sender);
        _;
    }

    /// @notice Function used by kernel when migrating to a new kernel.
    function changeKernel(Kernel newKernel_) external onlyKernel {
        kernel = newKernel_;
    }
}

/// @notice Base level extension of the kernel. Modules act as independent state components to be
///         interacted with and mutated through policies.
/// @dev    Modules are installed and uninstalled via the executor.
abstract contract Module is KernelAdapter {
    error Module_PolicyNotPermitted(address policy_);

    constructor(Kernel kernel_) KernelAdapter(kernel_) {}

    /// @notice Modifier to restrict which policies have access to module functions.
    modifier permissioned() {
        if (
            msg.sender == address(kernel) ||
            !kernel.modulePermissions(KEYCODE(), Policy(msg.sender), msg.sig)
        ) revert Module_PolicyNotPermitted(msg.sender);
        _;
    }

    /// @notice 5 byte identifier for a module.
    function KEYCODE() public pure virtual returns (Keycode) {}

    /// @notice Returns which semantic version of a module is being implemented.
    /// @return major - Major version upgrade indicates breaking change to the interface.
    /// @return minor - Minor version change retains backward-compatible interface.
    function VERSION() external pure virtual returns (uint8 major, uint8 minor) {}

    /// @notice Initialization function for the module
    /// @dev    This function is called when the module is installed or upgraded by the kernel.
    /// @dev    MUST BE GATED BY onlyKernel. Used to encompass any initialization or upgrade logic.
    function INIT() external virtual onlyKernel {}
}

/// @notice Policies are application logic and external interface for the kernel and installed modules.
/// @dev    Policies are activated and deactivated in the kernel by the executor.
/// @dev    Module dependencies and function permissions must be defined in appropriate functions.
abstract contract Policy is KernelAdapter {
    error Policy_ModuleDoesNotExist(Keycode keycode_);

    constructor(Kernel kernel_) KernelAdapter(kernel_) {}

    /// @notice Easily accessible indicator for if a policy is activated or not.
    function isActive() external view returns (bool) {
        return kernel.isPolicyActive(this);
    }

    /// @notice Function to grab module address from a given keycode.
    function getModuleAddress(Keycode keycode_) internal view returns (address) {
        address moduleForKeycode = address(kernel.getModuleForKeycode(keycode_));
        if (moduleForKeycode == address(0)) revert Policy_ModuleDoesNotExist(keycode_);
        return moduleForKeycode;
    }

    /// @notice Define module dependencies for this policy.
    /// @return dependencies - Keycode array of module dependencies.
    function configureDependencies() external virtual returns (Keycode[] memory dependencies) {}

    /// @notice Function called by kernel to set module function permissions.
    /// @return requests - Array of keycodes and function selectors for requested permissions.
    function requestPermissions() external view virtual returns (Permissions[] memory requests) {}
}

/// @notice Main contract that acts as a central component registry for the protocol.
/// @dev    The kernel manages modules and policies. The kernel is mutated via predefined Actions,
/// @dev    which are input from any address assigned as the executor. The executor can be changed as needed.
contract Kernel {
    // =========  EVENTS ========= //

    event PermissionsUpdated(
        Keycode indexed keycode_,
        Policy indexed policy_,
        bytes4 funcSelector_,
        bool granted_
    );
    event ActionExecuted(Actions indexed action_, address indexed target_);

    // =========  ERRORS ========= //

    error Kernel_OnlyExecutor(address caller_);
    error Kernel_ModuleAlreadyInstalled(Keycode module_);
    error Kernel_InvalidModuleUpgrade(Keycode module_);
    error Kernel_PolicyAlreadyActivated(address policy_);
    error Kernel_PolicyNotActivated(address policy_);

    // =========  PRIVILEGED ADDRESSES ========= //

    /// @notice Address that is able to initiate Actions in the kernel. Can be assigned to a multisig or governance contract.
    address public executor;

    // =========  MODULE MANAGEMENT ========= //

    /// @notice Array of all modules currently installed.
    Keycode[] public allKeycodes;

    /// @notice Mapping of module address to keycode.
    mapping(Keycode => Module) public getModuleForKeycode;

    /// @notice Mapping of keycode to module address.
    mapping(Module => Keycode) public getKeycodeForModule;

    /// @notice Mapping of a keycode to all of its policy dependents. Used to efficiently reconfigure policy dependencies.
    mapping(Keycode => Policy[]) public moduleDependents;

    /// @notice Helper for module dependent arrays. Prevents the need to loop through array.
    mapping(Keycode => mapping(Policy => uint256)) public getDependentIndex;

    /// @notice Module <> Policy Permissions.
    /// @dev    Keycode -> Policy -> Function Selector -> bool for permission
    mapping(Keycode => mapping(Policy => mapping(bytes4 => bool))) public modulePermissions;

    // =========  POLICY MANAGEMENT ========= //

    /// @notice List of all active policies
    Policy[] public activePolicies;

    /// @notice Helper to get active policy quickly. Prevents need to loop through array.
    mapping(Policy => uint256) public getPolicyIndex;

    //============================================================================================//
    //                                       CORE FUNCTIONS                                       //
    //============================================================================================//

    constructor() {
        executor = msg.sender;
    }

    /// @notice Modifier to check if caller is the executor.
    modifier onlyExecutor() {
        if (msg.sender != executor) revert Kernel_OnlyExecutor(msg.sender);
        _;
    }

    function isPolicyActive(Policy policy_) public view returns (bool) {
        return activePolicies.length > 0 && activePolicies[getPolicyIndex[policy_]] == policy_;
    }

    /// @notice Main kernel function. Initiates state changes to kernel depending on Action passed in.
    function executeAction(Actions action_, address target_) external onlyExecutor {
        if (action_ == Actions.InstallModule) {
            ensureContract(target_);
            ensureValidKeycode(Module(target_).KEYCODE());
            _installModule(Module(target_));
        } else if (action_ == Actions.UpgradeModule) {
            ensureContract(target_);
            ensureValidKeycode(Module(target_).KEYCODE());
            _upgradeModule(Module(target_));
        } else if (action_ == Actions.ActivatePolicy) {
            ensureContract(target_);
            _activatePolicy(Policy(target_));
        } else if (action_ == Actions.DeactivatePolicy) {
            ensureContract(target_);
            _deactivatePolicy(Policy(target_));
        } else if (action_ == Actions.ChangeExecutor) {
            executor = target_;
        } else if (action_ == Actions.MigrateKernel) {
            ensureContract(target_);
            _migrateKernel(Kernel(target_));
        }

        emit ActionExecuted(action_, target_);
    }

    function _installModule(Module newModule_) internal {
        Keycode keycode = newModule_.KEYCODE();

        if (address(getModuleForKeycode[keycode]) != address(0))
            revert Kernel_ModuleAlreadyInstalled(keycode);

        getModuleForKeycode[keycode] = newModule_;
        getKeycodeForModule[newModule_] = keycode;
        allKeycodes.push(keycode);

        newModule_.INIT();
    }

    function _upgradeModule(Module newModule_) internal {
        Keycode keycode = newModule_.KEYCODE();
        Module oldModule = getModuleForKeycode[keycode];

        if (address(oldModule) == address(0) || oldModule == newModule_)
            revert Kernel_InvalidModuleUpgrade(keycode);

        getKeycodeForModule[oldModule] = Keycode.wrap(bytes5(0));
        getKeycodeForModule[newModule_] = keycode;
        getModuleForKeycode[keycode] = newModule_;

        newModule_.INIT();

        _reconfigurePolicies(keycode);
    }

    function _activatePolicy(Policy policy_) internal {
        if (isPolicyActive(policy_)) revert Kernel_PolicyAlreadyActivated(address(policy_));

        // Add policy to list of active policies
        activePolicies.push(policy_);
        getPolicyIndex[policy_] = activePolicies.length - 1;

        // Record module dependencies
        Keycode[] memory dependencies = policy_.configureDependencies();
        uint256 depLength = dependencies.length;

        for (uint256 i; i < depLength; ) {
            Keycode keycode = dependencies[i];

            moduleDependents[keycode].push(policy_);
            getDependentIndex[keycode][policy_] = moduleDependents[keycode].length - 1;

            unchecked {
                ++i;
            }
        }

        // Grant permissions for policy to access restricted module functions
        Permissions[] memory requests = policy_.requestPermissions();
        _setPolicyPermissions(policy_, requests, true);
    }

    function _deactivatePolicy(Policy policy_) internal {
        if (!isPolicyActive(policy_)) revert Kernel_PolicyNotActivated(address(policy_));

        // Revoke permissions
        Permissions[] memory requests = policy_.requestPermissions();
        _setPolicyPermissions(policy_, requests, false);

        // Remove policy from all policy data structures
        uint256 idx = getPolicyIndex[policy_];
        Policy lastPolicy = activePolicies[activePolicies.length - 1];

        activePolicies[idx] = lastPolicy;
        activePolicies.pop();
        getPolicyIndex[lastPolicy] = idx;
        delete getPolicyIndex[policy_];

        // Remove policy from module dependents
        _pruneFromDependents(policy_);
    }

    /// @notice All functionality will move to the new kernel. WARNING: ACTION WILL BRICK THIS KERNEL.
    /// @dev    New kernel must add in all of the modules and policies via executeAction.
    /// @dev    NOTE: Data does not get cleared from this kernel.
    function _migrateKernel(Kernel newKernel_) internal {
        uint256 keycodeLen = allKeycodes.length;
        for (uint256 i; i < keycodeLen; ) {
            Module module = Module(getModuleForKeycode[allKeycodes[i]]);
            module.changeKernel(newKernel_);
            unchecked {
                ++i;
            }
        }

        uint256 policiesLen = activePolicies.length;
        for (uint256 j; j < policiesLen; ) {
            Policy policy = activePolicies[j];

            // Deactivate before changing kernel
            policy.changeKernel(newKernel_);
            unchecked {
                ++j;
            }
        }
    }

    function _reconfigurePolicies(Keycode keycode_) internal {
        Policy[] memory dependents = moduleDependents[keycode_];
        uint256 depLength = dependents.length;

        for (uint256 i; i < depLength; ) {
            dependents[i].configureDependencies();

            unchecked {
                ++i;
            }
        }
    }

    function _setPolicyPermissions(
        Policy policy_,
        Permissions[] memory requests_,
        bool grant_
    ) internal {
        uint256 reqLength = requests_.length;
        for (uint256 i = 0; i < reqLength; ) {
            Permissions memory request = requests_[i];
            modulePermissions[request.keycode][policy_][request.funcSelector] = grant_;

            emit PermissionsUpdated(request.keycode, policy_, request.funcSelector, grant_);

            unchecked {
                ++i;
            }
        }
    }

    function _pruneFromDependents(Policy policy_) internal {
        Keycode[] memory dependencies = policy_.configureDependencies();
        uint256 depcLength = dependencies.length;

        for (uint256 i; i < depcLength; ) {
            Keycode keycode = dependencies[i];
            Policy[] storage dependents = moduleDependents[keycode];

            uint256 origIndex = getDependentIndex[keycode][policy_];
            Policy lastPolicy = dependents[dependents.length - 1];

            // Swap with last and pop
            dependents[origIndex] = lastPolicy;
            dependents.pop();

            // Record new index and delete deactivated policy index
            getDependentIndex[keycode][lastPolicy] = origIndex;
            delete getDependentIndex[keycode][policy_];

            unchecked {
                ++i;
            }
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "from" argument.
            mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Arithmetic library with operations for fixed-point numbers.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol)
/// @author Inspired by USM (https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol)
library FixedPointMathLib {
    /*//////////////////////////////////////////////////////////////
                    SIMPLIFIED FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    uint256 internal constant MAX_UINT256 = 2**256 - 1;

    uint256 internal constant WAD = 1e18; // The scalar of ETH and most ERC20s.

    function mulWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, y, WAD); // Equivalent to (x * y) / WAD rounded down.
    }

    function mulWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, y, WAD); // Equivalent to (x * y) / WAD rounded up.
    }

    function divWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, WAD, y); // Equivalent to (x * WAD) / y rounded down.
    }

    function divWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, WAD, y); // Equivalent to (x * WAD) / y rounded up.
    }

    /*//////////////////////////////////////////////////////////////
                    LOW LEVEL FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function mulDivDown(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // Divide x * y by the denominator.
            z := div(mul(x, y), denominator)
        }
    }

    function mulDivUp(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // If x * y modulo the denominator is strictly greater than 0,
            // 1 is added to round up the division of x * y by the denominator.
            z := add(gt(mod(mul(x, y), denominator), 0), div(mul(x, y), denominator))
        }
    }

    function rpow(
        uint256 x,
        uint256 n,
        uint256 scalar
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            switch x
            case 0 {
                switch n
                case 0 {
                    // 0 ** 0 = 1
                    z := scalar
                }
                default {
                    // 0 ** n = 0
                    z := 0
                }
            }
            default {
                switch mod(n, 2)
                case 0 {
                    // If n is even, store scalar in z for now.
                    z := scalar
                }
                default {
                    // If n is odd, store x in z for now.
                    z := x
                }

                // Shifting right by 1 is like dividing by 2.
                let half := shr(1, scalar)

                for {
                    // Shift n right by 1 before looping to halve it.
                    n := shr(1, n)
                } n {
                    // Shift n right by 1 each iteration to halve it.
                    n := shr(1, n)
                } {
                    // Revert immediately if x ** 2 would overflow.
                    // Equivalent to iszero(eq(div(xx, x), x)) here.
                    if shr(128, x) {
                        revert(0, 0)
                    }

                    // Store x squared.
                    let xx := mul(x, x)

                    // Round to the nearest number.
                    let xxRound := add(xx, half)

                    // Revert if xx + half overflowed.
                    if lt(xxRound, xx) {
                        revert(0, 0)
                    }

                    // Set x to scaled xxRound.
                    x := div(xxRound, scalar)

                    // If n is even:
                    if mod(n, 2) {
                        // Compute z * x.
                        let zx := mul(z, x)

                        // If z * x overflowed:
                        if iszero(eq(div(zx, x), z)) {
                            // Revert if x is non-zero.
                            if iszero(iszero(x)) {
                                revert(0, 0)
                            }
                        }

                        // Round to the nearest number.
                        let zxRound := add(zx, half)

                        // Revert if zx + half overflowed.
                        if lt(zxRound, zx) {
                            revert(0, 0)
                        }

                        // Return properly scaled zxRound.
                        z := div(zxRound, scalar)
                    }
                }
            }
        }
    }

    /*//////////////////////////////////////////////////////////////
                        GENERAL NUMBER UTILITIES
    //////////////////////////////////////////////////////////////*/

    function sqrt(uint256 x) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            let y := x // We start y at x, which will help us make our initial estimate.

            z := 181 // The "correct" value is 1, but this saves a multiplication later.

            // This segment is to get a reasonable initial estimate for the Babylonian method. With a bad
            // start, the correct # of bits increases ~linearly each iteration instead of ~quadratically.

            // We check y >= 2^(k + 8) but shift right by k bits
            // each branch to ensure that if x >= 256, then y >= 256.
            if iszero(lt(y, 0x10000000000000000000000000000000000)) {
                y := shr(128, y)
                z := shl(64, z)
            }
            if iszero(lt(y, 0x1000000000000000000)) {
                y := shr(64, y)
                z := shl(32, z)
            }
            if iszero(lt(y, 0x10000000000)) {
                y := shr(32, y)
                z := shl(16, z)
            }
            if iszero(lt(y, 0x1000000)) {
                y := shr(16, y)
                z := shl(8, z)
            }

            // Goal was to get z*z*y within a small factor of x. More iterations could
            // get y in a tighter range. Currently, we will have y in [256, 256*2^16).
            // We ensured y >= 256 so that the relative difference between y and y+1 is small.
            // That's not possible if x < 256 but we can just verify those cases exhaustively.

            // Now, z*z*y <= x < z*z*(y+1), and y <= 2^(16+8), and either y >= 256, or x < 256.
            // Correctness can be checked exhaustively for x < 256, so we assume y >= 256.
            // Then z*sqrt(y) is within sqrt(257)/sqrt(256) of sqrt(x), or about 20bps.

            // For s in the range [1/256, 256], the estimate f(s) = (181/1024) * (s+1) is in the range
            // (1/2.84 * sqrt(s), 2.84 * sqrt(s)), with largest error when s = 1 and when s = 256 or 1/256.

            // Since y is in [256, 256*2^16), let a = y/65536, so that a is in [1/256, 256). Then we can estimate
            // sqrt(y) using sqrt(65536) * 181/1024 * (a + 1) = 181/4 * (y + 65536)/65536 = 181 * (y + 65536)/2^18.

            // There is no overflow risk here since y < 2^136 after the first branch above.
            z := shr(18, mul(z, add(y, 65536))) // A mul() is saved from starting z at 181.

            // Given the worst case multiplicative error of 2.84 above, 7 iterations should be enough.
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))

            // If x+1 is a perfect square, the Babylonian method cycles between
            // floor(sqrt(x)) and ceil(sqrt(x)). This statement ensures we return floor.
            // See: https://en.wikipedia.org/wiki/Integer_square_root#Using_only_integer_division
            // Since the ceil is rare, we save gas on the assignment and repeat division in the rare case.
            // If you don't care whether the floor or ceil square root is returned, you can remove this statement.
            z := sub(z, lt(div(x, z), z))
        }
    }

    function unsafeMod(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Mod x by y. Note this will return
            // 0 instead of reverting if y is zero.
            z := mod(x, y)
        }
    }

    function unsafeDiv(uint256 x, uint256 y) internal pure returns (uint256 r) {
        /// @solidity memory-safe-assembly
        assembly {
            // Divide x by y. Note this will return
            // 0 instead of reverting if y is zero.
            r := div(x, y)
        }
    }

    function unsafeDivUp(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Add 1 to x * y if x % y > 0. Note this will
            // return 0 instead of reverting if y is zero.
            z := add(gt(mod(x, y), 0), div(x, y))
        }
    }
}

// SPDX-License-Identifier: BSD

pragma solidity ^0.8.4;

/// @title ClonesWithImmutableArgs
/// @author wighawag, zefram.eth
/// @notice Enables creating clone contracts with immutable args
library ClonesWithImmutableArgs {
    error CreateFail();

    /// @notice Creates a clone proxy of the implementation contract, with immutable args
    /// @dev data cannot exceed 65535 bytes, since 2 bytes are used to store the data length
    /// @param implementation The implementation contract to clone
    /// @param data Encoded immutable args
    /// @return instance The address of the created clone
    function clone(address implementation, bytes memory data)
        internal
        returns (address instance)
    {
        // unrealistic for memory ptr or data length to exceed 256 bits
        unchecked {
            uint256 extraLength = data.length + 2; // +2 bytes for telling how much data there is appended to the call
            uint256 creationSize = 0x43 + extraLength;
            uint256 runSize = creationSize - 11;
            uint256 dataPtr;
            uint256 ptr;
            // solhint-disable-next-line no-inline-assembly
            assembly {
                ptr := mload(0x40)

                // -------------------------------------------------------------------------------------------------------------
                // CREATION (11 bytes)
                // -------------------------------------------------------------------------------------------------------------

                // 3d          | RETURNDATASIZE        | 0                       | –
                // 61 runtime  | PUSH2 runtime (r)     | r 0                     | –
                mstore(
                    ptr,
                    0x3d61000000000000000000000000000000000000000000000000000000000000
                )
                mstore(add(ptr, 0x02), shl(240, runSize)) // size of the contract running bytecode (16 bits)

                // creation size = 0b
                // 80          | DUP1                  | r r 0                   | –
                // 60 creation | PUSH1 creation (c)    | c r r 0                 | –
                // 3d          | RETURNDATASIZE        | 0 c r r 0               | –
                // 39          | CODECOPY              | r 0                     | [0-2d]: runtime code
                // 81          | DUP2                  | 0 c  0                  | [0-2d]: runtime code
                // f3          | RETURN                | 0                       | [0-2d]: runtime code
                mstore(
                    add(ptr, 0x04),
                    0x80600b3d3981f300000000000000000000000000000000000000000000000000
                )

                // -------------------------------------------------------------------------------------------------------------
                // RUNTIME
                // -------------------------------------------------------------------------------------------------------------

                // 36          | CALLDATASIZE          | cds                     | –
                // 3d          | RETURNDATASIZE        | 0 cds                   | –
                // 3d          | RETURNDATASIZE        | 0 0 cds                 | –
                // 37          | CALLDATACOPY          | –                       | [0, cds] = calldata
                // 61          | PUSH2 extra           | extra                   | [0, cds] = calldata
                mstore(
                    add(ptr, 0x0b),
                    0x363d3d3761000000000000000000000000000000000000000000000000000000
                )
                mstore(add(ptr, 0x10), shl(240, extraLength))

                // 60 0x38     | PUSH1 0x38            | 0x38 extra              | [0, cds] = calldata // 0x38 (56) is runtime size - data
                // 36          | CALLDATASIZE          | cds 0x38 extra          | [0, cds] = calldata
                // 39          | CODECOPY              | _                       | [0, cds] = calldata
                // 3d          | RETURNDATASIZE        | 0                       | [0, cds] = calldata
                // 3d          | RETURNDATASIZE        | 0 0                     | [0, cds] = calldata
                // 3d          | RETURNDATASIZE        | 0 0 0                   | [0, cds] = calldata
                // 36          | CALLDATASIZE          | cds 0 0 0               | [0, cds] = calldata
                // 61 extra    | PUSH2 extra           | extra cds 0 0 0         | [0, cds] = calldata
                mstore(
                    add(ptr, 0x12),
                    0x603836393d3d3d36610000000000000000000000000000000000000000000000
                )
                mstore(add(ptr, 0x1b), shl(240, extraLength))

                // 01          | ADD                   | cds+extra 0 0 0         | [0, cds] = calldata
                // 3d          | RETURNDATASIZE        | 0 cds 0 0 0             | [0, cds] = calldata
                // 73 addr     | PUSH20 0x123…         | addr 0 cds 0 0 0        | [0, cds] = calldata
                mstore(
                    add(ptr, 0x1d),
                    0x013d730000000000000000000000000000000000000000000000000000000000
                )
                mstore(add(ptr, 0x20), shl(0x60, implementation))

                // 5a          | GAS                   | gas addr 0 cds 0 0 0    | [0, cds] = calldata
                // f4          | DELEGATECALL          | success 0               | [0, cds] = calldata
                // 3d          | RETURNDATASIZE        | rds success 0           | [0, cds] = calldata
                // 82          | DUP3                  | 0 rds success 0         | [0, cds] = calldata
                // 80          | DUP1                  | 0 0 rds success 0       | [0, cds] = calldata
                // 3e          | RETURNDATACOPY        | success 0               | [0, rds] = return data (there might be some irrelevant leftovers in memory [rds, cds] when rds < cds)
                // 90          | SWAP1                 | 0 success               | [0, rds] = return data
                // 3d          | RETURNDATASIZE        | rds 0 success           | [0, rds] = return data
                // 91          | SWAP2                 | success 0 rds           | [0, rds] = return data
                // 60 0x36     | PUSH1 0x36            | 0x36 sucess 0 rds       | [0, rds] = return data
                // 57          | JUMPI                 | 0 rds                   | [0, rds] = return data
                // fd          | REVERT                | –                       | [0, rds] = return data
                // 5b          | JUMPDEST              | 0 rds                   | [0, rds] = return data
                // f3          | RETURN                | –                       | [0, rds] = return data

                mstore(
                    add(ptr, 0x34),
                    0x5af43d82803e903d91603657fd5bf30000000000000000000000000000000000
                )
            }

            // -------------------------------------------------------------------------------------------------------------
            // APPENDED DATA (Accessible from extcodecopy)
            // (but also send as appended data to the delegatecall)
            // -------------------------------------------------------------------------------------------------------------

            extraLength -= 2;
            uint256 counter = extraLength;
            uint256 copyPtr = ptr + 0x43;
            // solhint-disable-next-line no-inline-assembly
            assembly {
                dataPtr := add(data, 32)
            }
            for (; counter >= 32; counter -= 32) {
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    mstore(copyPtr, mload(dataPtr))
                }

                copyPtr += 32;
                dataPtr += 32;
            }
            uint256 mask = ~(256**(32 - counter) - 1);
            // solhint-disable-next-line no-inline-assembly
            assembly {
                mstore(copyPtr, and(mload(dataPtr), mask))
            }
            copyPtr += counter;
            // solhint-disable-next-line no-inline-assembly
            assembly {
                mstore(copyPtr, shl(240, extraLength))
            }
            // solhint-disable-next-line no-inline-assembly
            assembly {
                instance := create(0, ptr, creationSize)
            }
            if (instance == address(0)) {
                revert CreateFail();
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

import {SafeTransferLib} from "solmate/utils/SafeTransferLib.sol";
import {ERC20} from "solmate/tokens/ERC20.sol";
import {Clone} from "clones/Clone.sol";

import {CoolerFactory} from "./CoolerFactory.sol";
import {CoolerCallback} from "./CoolerCallback.sol";

// Function sig taken from gOHM contract
interface IDelegate { function delegate(address to_) external; }


/// @title  Cooler Loans.
/// @notice A Cooler is a smart contract escrow that facilitates fixed-duration, peer-to-peer
///         loans for a user-defined debt-collateral pair.
/// @dev    This contract uses Clones (https://github.com/wighawag/clones-with-immutable-args)
///         to save gas on deployment.
contract Cooler is Clone {
    using SafeTransferLib for ERC20;

    // --- ERRORS ----------------------------------------------------

    error OnlyApproved();
    error Deactivated();
    error Default();
    error NotExpired();
    error NotCoolerCallback();

    // --- DATA STRUCTURES -------------------------------------------

    /// @notice A loan begins with a borrow request.
    struct Request {
        uint256 amount;             // Amount to be borrowed.
        uint256 interest;           // Annualized percentage to be paid as interest.
        uint256 loanToCollateral;   // Requested loan-to-collateral ratio.
        uint256 duration;           // Time to repay the loan before it defaults.
        bool active;                // Any lender can clear an active loan request.
        address requester;          // The address that created the request.
    }

    /// @notice A request is converted to a loan when a lender clears it.
    struct Loan {
        Request request;        // Loan terms specified in the request.
        uint256 principal;      // Amount of principal debt owed to the lender.
        uint256 interestDue;    // Interest owed to the lender.
        uint256 collateral;     // Amount of collateral pledged.
        uint256 expiry;         // Time when the loan defaults.
        address lender;         // Lender's address.
        address recipient;      // Recipient of repayments.
        bool callback;          // If this is true, the lender must inherit CoolerCallback.
    }

    // --- IMMUTABLES ------------------------------------------------

    // This makes the code look prettier.
    uint256 private constant DECIMALS_INTEREST = 1e18;

    /// @notice This address owns the collateral in escrow.
    function owner() public pure returns (address _owner) {
        return _getArgAddress(0x0);
    }

    /// @notice This token is borrowed against.
    function collateral() public pure returns (ERC20 _collateral) {
        return ERC20(_getArgAddress(0x14));
    }

    /// @notice This token is lent.
    function debt() public pure returns (ERC20 _debt) {
        return ERC20(_getArgAddress(0x28));
    }
    
    /// @notice This contract created the Cooler
    function factory() public pure returns (CoolerFactory _factory) {
        return CoolerFactory(_getArgAddress(0x3c));
    }

    // --- STATE VARIABLES -------------------------------------------

    /// @notice Arrays stores all the loan requests.
    Request[] public requests;

    /// @notice Arrays stores all the granted loans.
    Loan[] public loans;

    /// @notice Facilitates transfer of lender ownership to new addresses
    mapping(uint256 => address) public approvals;

    // --- BORROWER --------------------------------------------------

    /// @notice Request a loan with given parameters.
    ///         Collateral is taken at time of request.
    /// @param  amount_ of debt tokens to borrow.
    /// @param  interest_ to pay (annualized % of 'amount_'). Expressed in DECIMALS_INTEREST.
    /// @param  loanToCollateral_ debt tokens per collateral token pledged. Expressed in 10**collateral().decimals().
    /// @param  duration_ of loan tenure in seconds.
    /// @return reqID of the created request. Equivalent to the index of request in requests[].
    function requestLoan(
        uint256 amount_,
        uint256 interest_,
        uint256 loanToCollateral_,
        uint256 duration_
    ) external returns (uint256 reqID) {
        reqID = requests.length;
        requests.push(
            Request({
                amount: amount_,
                interest: interest_,
                loanToCollateral: loanToCollateral_,
                duration: duration_,
                active: true,
                requester: msg.sender
            })
        );

        // The collateral is taken upfront. Will be escrowed
        // until the loan is repaid or defaulted.
        collateral().safeTransferFrom(
            msg.sender,
            address(this),
            collateralFor(amount_, loanToCollateral_)
        );

        // Log the event.
        factory().logRequestLoan(reqID);
    }

    /// @notice Cancel a loan request and get the collateral back.
    /// @param  reqID_ index of request in requests[].
    function rescindRequest(uint256 reqID_) external {
        if (msg.sender != owner()) revert OnlyApproved();

        Request storage req = requests[reqID_];

        if (!req.active) revert Deactivated();

        // Update storage and send collateral back to the owner.
        req.active = false;
        collateral().safeTransfer(owner(), collateralFor(req.amount, req.loanToCollateral));

        // Log the event.
        factory().logRescindRequest(reqID_);
    }

    /// @notice Repay a loan to get the collateral back.
    /// @dev    Despite a malicious lender could reenter with the callback, the
    ///         usage of `msg.sender` prevents any economical benefit to the
    ///         attacker, since they would be repaying the loan themselves.
    /// @param  loanID_ index of loan in loans[].
    /// @param  repayment_ debt tokens to be repaid.
    /// @return collateral given back to the borrower.
    function repayLoan(uint256 loanID_, uint256 repayment_) external returns (uint256) {
        Loan memory loan = loans[loanID_];

        if (block.timestamp > loan.expiry) revert Default();

        // Cap the repayment to the total debt of the loan
        uint256 totalDebt = loan.principal + loan.interestDue;
        if (repayment_ > totalDebt) repayment_ = totalDebt;

        // Need to repay interest first, then any extra goes to paying down principal.
        uint256 interestPaid;
        uint256 remainder;
        if (repayment_ >= loan.interestDue) {
            remainder = repayment_ - loan.interestDue;
            interestPaid = loan.interestDue;
            loan.interestDue = 0;
        } else {
            loan.interestDue -= repayment_;
            interestPaid = repayment_;
        }

        // We pay back only if user has paid back principal. This can be 0.
        uint256 decollateralized;
        if (remainder > 0) {
            decollateralized = (loan.collateral * remainder) / loan.principal;
            
            loan.principal -= remainder;
            loan.collateral -= decollateralized;
        }

        // Save updated loan info in storage.
        loans[loanID_] = loan;

        // Transfer repaid debt back to the lender and collateral back to the owner if applicable
        debt().safeTransferFrom(msg.sender, loan.recipient, repayment_);
        if (decollateralized > 0) collateral().safeTransfer(owner(), decollateralized);

        // Log the event.
        factory().logRepayLoan(loanID_, repayment_);

        // If necessary, trigger lender callback.
        if (loan.callback) {
            CoolerCallback(loan.lender).onRepay(loanID_, remainder, interestPaid);
        }

        return decollateralized;
    }

    /// @notice Delegate voting power on collateral.
    /// @param  to_ address to delegate.
    function delegateVoting(address to_) external {
        if (msg.sender != owner()) revert OnlyApproved();
        IDelegate(address(collateral())).delegate(to_);
    }

    // --- LENDER ----------------------------------------------------

    /// @notice Fill a requested loan as a lender.
    /// @param  reqID_ index of request in requests[].
    /// @param  recipient_ address to repay the loan to.
    /// @param  isCallback_ true if the lender implements the CoolerCallback abstract. False otherwise.
    /// @return loanID of the granted loan. Equivalent to the index of loan in loans[].
    function clearRequest(
        uint256 reqID_,
        address recipient_,
        bool isCallback_
    ) external returns (uint256 loanID) {
        Request memory req = requests[reqID_];

        // Loan callbacks are only allowed if:
        //  1. The loan request has been created via a trusted lender.
        //  2. The lender signals that it implements the CoolerCallback Abstract.
        bool callback = (isCallback_ && msg.sender == req.requester);

        // If necessary, ensure lender implements the CoolerCallback abstract.
        if (callback && !CoolerCallback(msg.sender).isCoolerCallback()) revert NotCoolerCallback();
        // Ensure loan request is active. 
        if (!req.active) revert Deactivated();

        // Clear the loan request in memory.
        req.active = false;

        // Calculate and store loan terms.
        uint256 interest = interestFor(req.amount, req.interest, req.duration);
        uint256 collat = collateralFor(req.amount, req.loanToCollateral);
        loanID = loans.length;

        loans.push(
            Loan({
                request: req,
                principal: req.amount,
                interestDue: interest,
                collateral: collat,
                expiry: block.timestamp + req.duration,
                lender: msg.sender,
                recipient: recipient_,
                callback: callback
            })
        );

        // Clear the loan request storage.
        requests[reqID_].active = false;

        // Transfer debt tokens to the owner of the request.
        debt().safeTransferFrom(msg.sender, owner(), req.amount);

        // Log the event.
        factory().logClearRequest(reqID_, loanID);
    }

    /// @notice Allow lender to extend a loan for the borrower. Doesn't require
    ///         borrower permission because it doesn't have a negative impact for them.
    /// @dev    Since this function solely impacts the expiration day, the lender
    ///         should ensure that extension interest payments are done beforehand.
    /// @param  loanID_ index of loan in loans[].
    /// @param  times_ that the fixed-term loan duration is extended.
    function extendLoanTerms(uint256 loanID_, uint8 times_) external {
        Loan memory loan = loans[loanID_];

        if (msg.sender != loan.lender) revert OnlyApproved();
        if (block.timestamp > loan.expiry) revert Default();

        // Update loan terms to reflect the extension.
        loan.expiry += loan.request.duration * times_;

        // Save updated loan info in storage.
        loans[loanID_] = loan;

        // Log the event.
        factory().logExtendLoan(loanID_, times_);
    }

    /// @notice Claim collateral upon loan default.
    /// @param  loanID_ index of loan in loans[].
    /// @return defaulted debt by the borrower, collateral kept by the lender, elapsed time since expiry.
    function claimDefaulted(uint256 loanID_) external returns (uint256, uint256, uint256, uint256) {
        Loan memory loan = loans[loanID_];

        if (block.timestamp <= loan.expiry) revert NotExpired();

        loans[loanID_].principal = 0;
        loans[loanID_].interestDue = 0;
        loans[loanID_].collateral = 0;

        // Transfer defaulted collateral to the lender.
        collateral().safeTransfer(loan.lender, loan.collateral);

        // Log the event.
        factory().logDefaultLoan(loanID_, loan.collateral);

        // If necessary, trigger lender callback.
        if (loan.callback) {
            CoolerCallback(loan.lender).onDefault(loanID_, loan.principal, loan.interestDue, loan.collateral);
        }

        return (loan.principal, loan.interestDue, loan.collateral, block.timestamp - loan.expiry);
    }

    /// @notice Approve transfer of loan ownership rights to a new address.
    /// @param  to_ address to be approved.
    /// @param  loanID_ index of loan in loans[].
    function approveTransfer(address to_, uint256 loanID_) external {
        if (msg.sender != loans[loanID_].lender) revert OnlyApproved();

        // Update transfer approvals.
        approvals[loanID_] = to_;
    }

    /// @notice Execute loan ownership transfer. Must be previously approved by the lender.
    /// @param  loanID_ index of loan in loans[].
    function transferOwnership(uint256 loanID_) external {
        if (msg.sender != approvals[loanID_]) revert OnlyApproved();

        // Update the load lender and the recipient.
        loans[loanID_].lender = msg.sender;
        loans[loanID_].recipient = msg.sender;
        // Callbacks are disabled when transferring ownership.
        loans[loanID_].callback = false;
        // Clear transfer approvals.
        approvals[loanID_] = address(0);
    }

    /// @notice Allow lender to set repayment recipient of a given loan.
    /// @param  loanID_ of lender's loan.
    /// @param  recipient_ reciever of repayments
    function setRepaymentAddress(uint256 loanID_, address recipient_) external {
        if (msg.sender != loans[loanID_].lender) revert OnlyApproved();

        // Update the repayment method.
        loans[loanID_].recipient = recipient_;
    }

    // --- AUX FUNCTIONS ---------------------------------------------

    /// @notice Compute collateral needed for a desired loan amount at given loan to collateral ratio.
    /// @param  principal_ amount of debt tokens.
    /// @param  loanToCollateral_ ratio for loan. Expressed in 10**collateral().decimals().
    function collateralFor(uint256 principal_, uint256 loanToCollateral_) public view returns (uint256) {
        return (principal_ * (10 ** collateral().decimals())) / loanToCollateral_;
    }

    /// @notice Compute interest cost on amount for duration at given annualized rate.
    /// @param  principal_ amount of debt tokens.
    /// @param  rate_ of interest (annualized).
    /// @param  duration_ of the loan in seconds.
    /// @return Interest in debt token terms.
    function interestFor(uint256 principal_, uint256 rate_, uint256 duration_) public pure returns (uint256) {
        uint256 interest = (rate_ * duration_) / 365 days;
        return (principal_ * interest) / DECIMALS_INTEREST;
    }

    /// @notice Check if given loan has expired.
    /// @param  loanID_ index of loan in loans[].
    /// @return Expiration status.
    function hasExpired(uint256 loanID_) external view returns (bool) {
        return block.timestamp > loans[loanID_].expiry;
    }

    /// @notice Check if a given request is active.
    /// @param  reqID_ index of request in requests[].
    /// @return Active status.
    function isActive(uint256 reqID_) external view returns (bool) {
        return requests[reqID_].active;
    }

    /// @notice Getter for Request data as a struct.
    /// @param  reqID_ index of request in requests[].
    /// @return Request struct.
    function getRequest(uint256 reqID_) external view returns (Request memory) {
        return requests[reqID_];
    }

    /// @notice Getter for Loan data as a struct.
    /// @param loanID_ index of loan in loans[].
    /// @return Loan struct.
    function getLoan(uint256 loanID_) external view returns (Loan memory) {
        return loans[loanID_];
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

import "src/Kernel.sol";

abstract contract ROLESv1 is Module {
    // =========  EVENTS ========= //

    event RoleGranted(bytes32 indexed role_, address indexed addr_);
    event RoleRevoked(bytes32 indexed role_, address indexed addr_);

    // =========  ERRORS ========= //

    error ROLES_InvalidRole(bytes32 role_);
    error ROLES_RequireRole(bytes32 role_);
    error ROLES_AddressAlreadyHasRole(address addr_, bytes32 role_);
    error ROLES_AddressDoesNotHaveRole(address addr_, bytes32 role_);
    error ROLES_RoleDoesNotExist(bytes32 role_);

    // =========  STATE ========= //

    /// @notice Mapping for if an address has a policy-defined role.
    mapping(address => mapping(bytes32 => bool)) public hasRole;

    // =========  FUNCTIONS ========= //

    /// @notice Function to grant policy-defined roles to some address. Can only be called by admin.
    function saveRole(bytes32 role_, address addr_) external virtual;

    /// @notice Function to revoke policy-defined roles from some address. Can only be called by admin.
    function removeRole(bytes32 role_, address addr_) external virtual;

    /// @notice "Modifier" to restrict policy function access to certain addresses with a role.
    /// @dev    Roles are defined in the policy and granted by the ROLES admin.
    function requireRole(bytes32 role_, address caller_) external virtual;

    /// @notice Function that checks if role is valid (all lower case)
    function ensureValidRole(bytes32 role_) external pure virtual;
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity >=0.7.5;

/// @notice Olympus OHM token
/// @dev This contract is the legacy v2 OHM token. Included in the repo for completeness,
///      since it is not being changed and is imported in some contracts.

interface IOlympusAuthority {
    // =========  EVENTS ========= //

    event GovernorPushed(address indexed from, address indexed to, bool _effectiveImmediately);
    event GuardianPushed(address indexed from, address indexed to, bool _effectiveImmediately);
    event PolicyPushed(address indexed from, address indexed to, bool _effectiveImmediately);
    event VaultPushed(address indexed from, address indexed to, bool _effectiveImmediately);

    event GovernorPulled(address indexed from, address indexed to);
    event GuardianPulled(address indexed from, address indexed to);
    event PolicyPulled(address indexed from, address indexed to);
    event VaultPulled(address indexed from, address indexed to);

    // =========  VIEW ========= //

    function governor() external view returns (address);

    function guardian() external view returns (address);

    function policy() external view returns (address);

    function vault() external view returns (address);
}

// File: types/OlympusAccessControlled.sol

abstract contract OlympusAccessControlled {
    // =========  EVENTS ========= //

    event AuthorityUpdated(IOlympusAuthority indexed authority);

    string internal UNAUTHORIZED = "UNAUTHORIZED"; // save gas

    // =========  STATE VARIABLES ========= //

    IOlympusAuthority public authority;

    // =========  Constructor ========= //

    constructor(IOlympusAuthority _authority) {
        authority = _authority;
        emit AuthorityUpdated(_authority);
    }

    // =========  MODIFIERS ========= //

    modifier onlyGovernor() {
        require(msg.sender == authority.governor(), UNAUTHORIZED);
        _;
    }

    modifier onlyGuardian() {
        require(msg.sender == authority.guardian(), UNAUTHORIZED);
        _;
    }

    modifier onlyPermitted() {
        require(msg.sender == authority.policy(), UNAUTHORIZED);
        _;
    }

    modifier onlyVault() {
        require(msg.sender == authority.vault(), UNAUTHORIZED);
        _;
    }

    // =========  GOV ONLY ========= //

    function setAuthority(IOlympusAuthority _newAuthority) external onlyGovernor {
        authority = _newAuthority;
        emit AuthorityUpdated(_newAuthority);
    }
}

// File: cryptography/ECDSA.sol

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes memory signature
    ) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(
        bytes32 domainSeparator,
        bytes32 structHash
    ) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// File: cryptography/EIP712.sol

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = chainID;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        if (chainID == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        return keccak256(abi.encode(typeHash, nameHash, versionHash, chainID, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

// File: interfaces/IERC20Permit.sol

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

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

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

// File: interfaces/IERC20.sol

interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

// File: interfaces/IOHM.sol

interface IOHM is IERC20 {
    function mint(address account_, uint256 amount_) external;

    function burn(uint256 amount) external;

    function burnFrom(address account_, uint256 amount_) external;
}

// File: libraries/SafeMath.sol

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        assert(a == b * c + (a % b)); // There is no case in which this doesn't hold

        return c;
    }

    // Only used in the  BondingCalculator.sol
    function sqrrt(uint256 a) internal pure returns (uint256 c) {
        if (a > 3) {
            c = a;
            uint256 b = add(div(a, 2), 1);
            while (b < c) {
                c = b;
                b = div(add(div(a, b), b), 2);
            }
        } else if (a != 0) {
            c = 1;
        }
    }
}

// File: libraries/Counters.sol

library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        // The {SafeMath} overflow check can be skipped here, see the comment at the top
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

// File: types/ERC20.sol

abstract contract ERC20 is IERC20 {
    using SafeMath for uint256;

    // TODO comment actual hash value.
    bytes32 private constant ERC20TOKEN_ERC1820_INTERFACE_ID = keccak256("ERC20Token");

    mapping(address => uint256) internal _balances;

    mapping(address => mapping(address => uint256)) internal _allowances;

    uint256 internal _totalSupply;

    string internal _name;

    string internal _symbol;

    uint8 internal immutable _decimals;

    constructor(string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            msg.sender,
            _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance")
        );
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public virtual returns (bool) {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _beforeTokenTransfer(address from_, address to_, uint256 amount_) internal virtual {}
}

// File: types/ERC20Permit.sol

/**
 * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private immutable _PERMIT_TYPEHASH =
        keccak256(
            "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
        );

    /**
     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
     *
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    constructor(string memory name) EIP712(name, "1") {}

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(
            abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline)
        );

        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");

        _approve(owner, spender, value);
    }

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    function nonces(address owner) public view virtual override returns (uint256) {
        return _nonces[owner].current();
    }

    /**
     * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        Counters.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
}

// File: OlympusERC20.sol

contract OlympusERC20Token is ERC20Permit, IOHM, OlympusAccessControlled {
    using SafeMath for uint256;

    constructor(
        address _authority
    )
        ERC20("Olympus", "OHM", 9)
        ERC20Permit("Olympus")
        OlympusAccessControlled(IOlympusAuthority(_authority))
    {}

    function mint(address account_, uint256 amount_) external override onlyVault {
        _mint(account_, amount_);
    }

    function burn(uint256 amount) external override {
        _burn(msg.sender, amount);
    }

    function burnFrom(address account_, uint256 amount_) external override {
        _burnFrom(account_, amount_);
    }

    function _burnFrom(address account_, uint256 amount_) internal {
        uint256 decreasedAllowance_ = allowance(account_, msg.sender).sub(
            amount_,
            "ERC20: burn amount exceeds allowance"
        );

        _approve(account_, msg.sender, decreasedAllowance_);
        _burn(account_, amount_);
    }
}

// SPDX-License-Identifier: BSD
pragma solidity ^0.8.4;

/// @title Clone
/// @author zefram.eth
/// @notice Provides helper functions for reading immutable args from calldata
contract Clone {
    /// @notice Reads an immutable arg with type address
    /// @param argOffset The offset of the arg in the packed data
    /// @return arg The arg value
    function _getArgAddress(uint256 argOffset)
        internal
        pure
        returns (address arg)
    {
        uint256 offset = _getImmutableArgsOffset();
        assembly {
            arg := shr(0x60, calldataload(add(offset, argOffset)))
        }
    }

    /// @notice Reads an immutable arg with type uint256
    /// @param argOffset The offset of the arg in the packed data
    /// @return arg The arg value
    function _getArgUint256(uint256 argOffset)
        internal
        pure
        returns (uint256 arg)
    {
        uint256 offset = _getImmutableArgsOffset();
        // solhint-disable-next-line no-inline-assembly
        assembly {
            arg := calldataload(add(offset, argOffset))
        }
    }

    /// @notice Reads an immutable arg with type uint64
    /// @param argOffset The offset of the arg in the packed data
    /// @return arg The arg value
    function _getArgUint64(uint256 argOffset)
        internal
        pure
        returns (uint64 arg)
    {
        uint256 offset = _getImmutableArgsOffset();
        // solhint-disable-next-line no-inline-assembly
        assembly {
            arg := shr(0xc0, calldataload(add(offset, argOffset)))
        }
    }

    /// @notice Reads an immutable arg with type uint8
    /// @param argOffset The offset of the arg in the packed data
    /// @return arg The arg value
    function _getArgUint8(uint256 argOffset) internal pure returns (uint8 arg) {
        uint256 offset = _getImmutableArgsOffset();
        // solhint-disable-next-line no-inline-assembly
        assembly {
            arg := shr(0xf8, calldataload(add(offset, argOffset)))
        }
    }

    /// @return offset The offset of the packed immutable args in calldata
    function _getImmutableArgsOffset() internal pure returns (uint256 offset) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            offset := sub(
                calldatasize(),
                add(shr(240, calldataload(sub(calldatasize(), 2))), 2)
            )
        }
    }
}

{
  "remappings": [
    "ds-test/=lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "interfaces/=src/interfaces/",
    "modules/=src/modules/",
    "policies/=src/policies/",
    "libraries/=src/libraries/",
    "solmate/=lib/solmate/src/",
    "layer-zero/=lib/solidity-examples/contracts/",
    "bonds/=lib/bonds/src/",
    "test/=src/test/",
    "clones/=lib/clones-with-immutable-args/src/",
    "cooler/=lib/Cooler/src/",
    "balancer-v2/=lib/balancer-v2/",
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "Cooler/=lib/Cooler/src/",
    "clones-with-immutable-args/=lib/clones-with-immutable-args/src/",
    "olympus-v3/=lib/Cooler/lib/olympus-v3/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "solidity-examples/=lib/solidity-examples/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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MINTRv1","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROLES","outputs":[{"internalType":"contract ROLESv1","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TRSRY","outputs":[{"internalType":"contract TRSRYv1","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"active","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract Kernel","name":"newKernel_","type":"address"}],"name":"changeKernel","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"coolers_","type":"address[]"},{"internalType":"uint256[]","name":"loans_","type":"uint256[]"}],"name":"claimDefaulted","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"configureDependencies","outputs":[{"internalType":"Keycode[]","name":"dependencies","type":"bytes5[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dai","outputs":[{"internalType":"contract ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract ERC20","name":"token_","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"}],"name":"defund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"emergencyShutdown","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract Cooler","name":"cooler_","type":"address"},{"internalType":"uint256","name":"loanID_","type":"uint256"},{"internalType":"uint8","name":"times_","type":"uint8"}],"name":"extendLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"contract CoolerFactory","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fundTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"principal_","type":"uint256"}],"name":"getCollateralForLoan","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"collateral_","type":"uint256"}],"name":"getLoanForCollateral","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getTotalReceivables","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gohm","outputs":[{"internalType":"contract ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"principal_","type":"uint256"},{"internalType":"uint256","name":"duration_","type":"uint256"}],"name":"interestForLoan","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"interestReceivables","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isCoolerCallback","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"kernel","outputs":[{"internalType":"contract Kernel","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Cooler","name":"cooler_","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"}],"name":"lendToCooler","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"ohm","outputs":[{"internalType":"contract ERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"loanID_","type":"uint256"},{"internalType":"uint256","name":"principle","type":"uint256"},{"internalType":"uint256","name":"interest","type":"uint256"},{"internalType":"uint256","name":"collateral","type":"uint256"}],"name":"onDefault","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"loanID_","type":"uint256"},{"internalType":"uint256","name":"principlePaid_","type":"uint256"},{"internalType":"uint256","name":"interestPaid_","type":"uint256"}],"name":"onRepay","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"principalReceivables","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"reactivate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rebalance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"requestPermissions","outputs":[{"components":[{"internalType":"Keycode","name":"keycode","type":"bytes5"},{"internalType":"bytes4","name":"funcSelector","type":"bytes4"}],"internalType":"struct Permissions[]","name":"requests","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sdai","outputs":[{"internalType":"contract ERC4626","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"staking","outputs":[{"internalType":"contract IStaking","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sweepIntoDSR","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000064aa3364f17a4d01c6f1751fd97c2bd3d7e7f1d50000000000000000000000000ab87046fbb341d058f17cbc4c1133f25a20a52f000000000000000000000000b63cac384247597756545b500253ff8e607a802000000000000000000000000083f20f44975d03b1b09e64809b757c47f942beea00000000000000000000000030ce56e80aa96ebba1e1a74bc5c0feb5b0db42160000000000000000000000002286d7f9639e8158fad1169e76d1fbc38247f54b

-----Decoded View---------------
Arg [0] : ohm_ (address): 0x64aa3364F17a4D01c6f1751Fd97C2BD3D7e7f1D5
Arg [1] : gohm_ (address): 0x0ab87046fBb341D058F17CBC4c1133F25a20a52f
Arg [2] : staking_ (address): 0xB63cac384247597756545b500253ff8E607a8020
Arg [3] : sdai_ (address): 0x83F20F44975D03b1b09e64809B757c47f942BEeA
Arg [4] : coolerFactory_ (address): 0x30Ce56e80aA96EbbA1E1a74bC5c0FEB5B0dB4216
Arg [5] : kernel_ (address): 0x2286d7f9639e8158FaD1169e76d1FbC38247f54b

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 00000000000000000000000064aa3364f17a4d01c6f1751fd97c2bd3d7e7f1d5
Arg [1] : 0000000000000000000000000ab87046fbb341d058f17cbc4c1133f25a20a52f
Arg [2] : 000000000000000000000000b63cac384247597756545b500253ff8e607a8020
Arg [3] : 00000000000000000000000083f20f44975d03b1b09e64809b757c47f942beea
Arg [4] : 00000000000000000000000030ce56e80aa96ebba1e1a74bc5c0feb5b0db4216
Arg [5] : 0000000000000000000000002286d7f9639e8158fad1169e76d1fbc38247f54b