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// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.18;

import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {RewardHandler} from "./RewardHandler.sol";

import {IERC4626} from "@openzeppelin/contracts/interfaces/IERC4626.sol";
import {TokenizedStaker, ERC20} from "@periphery/Bases/Staker/TokenizedStaker.sol";
import {Auction} from "@periphery/Auctions/Auction.sol";

contract YearnYieldSplitter is TokenizedStaker {
    using SafeERC20 for ERC20;

    /// @notice The vault that the `asset` is deposited into.
    IERC4626 public immutable vault;

    /// @notice The token that the yield is converted into.
    address public immutable want;

    /// @notice The reward handler that will claim rewards and notify the strategy.
    address public immutable rewardHandler;

    /// @notice The auction that the `asset` is auctioned off in.
    Auction public auction;

    constructor(
        address _asset,
        string memory _name,
        address _vault,
        address _want,
        address _rewardHandler
    ) TokenizedStaker(_asset, _name) {
        asset.forceApprove(_vault, type(uint256).max);
        vault = IERC4626(_vault);
        want = _want;
        rewardHandler = _rewardHandler;

        _addReward(want, rewardHandler, 3 days);
    }

    /*//////////////////////////////////////////////////////////////
                NEEDED TO BE OVERRIDDEN BY STRATEGIST
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Can deploy up to '_amount' of 'asset' in the yield source.
     *
     * This function is called at the end of a {deposit} or {mint}
     * call. Meaning that unless a whitelist is implemented it will
     * be entirely permissionless and thus can be sandwiched or otherwise
     * manipulated.
     *
     * @param _amount The amount of 'asset' that the strategy can attempt
     * to deposit in the yield source.
     */
    function _deployFunds(uint256 _amount) internal override {
        vault.deposit(_amount, address(this));
    }

    /**
     * @dev Should attempt to free the '_amount' of 'asset'.
     *
     * NOTE: The amount of 'asset' that is already loose has already
     * been accounted for.
     *
     * This function is called during {withdraw} and {redeem} calls.
     * Meaning that unless a whitelist is implemented it will be
     * entirely permissionless and thus can be sandwiched or otherwise
     * manipulated.
     *
     * Should not rely on asset.balanceOf(address(this)) calls other than
     * for diff accounting purposes.
     *
     * Any difference between `_amount` and what is actually freed will be
     * counted as a loss and passed on to the withdrawer. This means
     * care should be taken in times of illiquidity. It may be better to revert
     * if withdraws are simply illiquid so not to realize incorrect losses.
     *
     * @param _amount, The amount of 'asset' to be freed.
     */
    function _freeFunds(uint256 _amount) internal override {
        // Use previewWithdraw to round up.
        uint256 shares = vault.previewWithdraw(_amount);
        shares = Math.min(shares, balanceOfVault());

        vault.redeem(shares, address(this), address(this));
    }

    /**
     * @dev Internal function to harvest all rewards, redeploy any idle
     * funds and return an accurate accounting of all funds currently
     * held by the Strategy.
     *
     * This should do any needed harvesting, rewards selling, accrual,
     * redepositing etc. to get the most accurate view of current assets.
     *
     * NOTE: All applicable assets including loose assets should be
     * accounted for in this function.
     *
     * Care should be taken when relying on oracles or swap values rather
     * than actual amounts as all Strategy profit/loss accounting will
     * be done based on this returned value.
     *
     * This can still be called post a shutdown, a strategist can check
     * `TokenizedStrategy.isShutdown()` to decide if funds should be
     * redeployed or simply realize any profits/losses.
     *
     * @return _totalAssets A trusted and accurate account for the total
     * amount of 'asset' the strategy currently holds including idle funds.
     */
    function _harvestAndReport()
        internal
        override
        returns (uint256 _totalAssets)
    {
        // Claim and notify pending rewards.
        RewardHandler(rewardHandler).claimRewards();

        _totalAssets = TokenizedStrategy.totalAssets();

        // Settle if already taken but not done.
        if (auction.isActive(address(asset))) {
            if (auction.available(address(asset)) == 0) {
                auction.settle(address(asset));
            } else {
                // If still active just return.
                return _totalAssets;
            }
        }

        uint256 looseAssets = balanceOfAsset();
        uint256 currentAssets = looseAssets + valueOfVault();
        uint256 profit;
        if (currentAssets > _totalAssets) {
            profit = currentAssets - _totalAssets;

            if (profit > looseAssets) {
                _freeFunds(profit - looseAssets);
            }

            // Adjust for any rounding losses on withdraw.
            profit = Math.min(profit, balanceOfAsset());

            // If no profit return actual assets in case of loss
        } else {
            return currentAssets;
        }

        // Fees
        uint256 performanceFee = TokenizedStrategy.performanceFee();
        uint256 fee;
        if (performanceFee > 0) {
            fee = (profit * performanceFee) / MAX_BPS;
            asset.safeTransfer(
                TokenizedStrategy.performanceFeeRecipient(),
                fee
            );
        }

        // Kick next auction
        asset.safeTransfer(address(auction), profit - fee);
        auction.kick(address(asset));
    }

    function claimRewards() external onlyKeepers {
        RewardHandler(rewardHandler).claimRewards();
    }

    function balanceOfVault() public view returns (uint256) {
        return vault.balanceOf(address(this));
    }

    function balanceOfAsset() public view returns (uint256) {
        return asset.balanceOf(address(this));
    }

    function valueOfVault() public view virtual returns (uint256) {
        return vault.convertToAssets(balanceOfVault());
    }

    function vaultsMaxWithdraw() public view virtual returns (uint256) {
        return vault.convertToAssets(vault.maxRedeem(address(this)));
    }

    /*//////////////////////////////////////////////////////////////
                    OPTIONAL TO OVERRIDE BY STRATEGIST
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Gets the max amount of `asset` that can be withdrawn.
     * @dev Defaults to an unlimited amount for any address. But can
     * be overridden by strategists.
     *
     * This function will be called before any withdraw or redeem to enforce
     * any limits desired by the strategist. This can be used for illiquid
     * or sandwichable strategies.
     *
     *   EX:
     *       return asset.balanceOf(yieldSource);
     *
     * This does not need to take into account the `_owner`'s share balance
     * or conversion rates from shares to assets.
     *
     * @param . The address that is withdrawing from the strategy.
     * @return . The available amount that can be withdrawn in terms of `asset`
     */
    function availableWithdrawLimit(
        address /*_owner*/
    ) public view override returns (uint256) {
        return balanceOfAsset() + vaultsMaxWithdraw();
    }

    /**
     * @notice Gets the max amount of `asset` that an address can deposit.
     * @dev Defaults to an unlimited amount for any address. But can
     * be overridden by strategists.
     *
     * This function will be called before any deposit or mints to enforce
     * any limits desired by the strategist. This can be used for either a
     * traditional deposit limit or for implementing a whitelist etc.
     *
     *   EX:
     *      if(isAllowed[_owner]) return super.availableDepositLimit(_owner);
     *
     * This does not need to take into account any conversion rates
     * from shares to assets. But should know that any non max uint256
     * amounts may be converted to shares. So it is recommended to keep
     * custom amounts low enough as not to cause overflow when multiplied
     * by `totalSupply`.
     *
     * @param . The address that is depositing into the strategy.
     * @return . The available amount the `_owner` can deposit in terms of `asset`
     */
    function availableDepositLimit(
        address
    ) public view override returns (uint256) {
        return vault.maxDeposit(address(this));
    }

    /**
     * @dev Optional function for a strategist to override that will
     * allow management to manually withdraw deployed funds from the
     * yield source if a strategy is shutdown.
     *
     * This should attempt to free `_amount`, noting that `_amount` may
     * be more than is currently deployed.
     *
     * NOTE: This will not realize any profits or losses. A separate
     * {report} will be needed in order to record any profit/loss. If
     * a report may need to be called after a shutdown it is important
     * to check if the strategy is shutdown during {_harvestAndReport}
     * so that it does not simply re-deploy all funds that had been freed.
     *
     * EX:
     *   if(freeAsset > 0 && !TokenizedStrategy.isShutdown()) {
     *       depositFunds...
     *    }
     *
     * @param _amount The amount of asset to attempt to free.
     */
    function _emergencyWithdraw(uint256 _amount) internal override {
        _freeFunds(Math.min(_amount, vaultsMaxWithdraw()));
    }

    function setAuction(address _auction) external onlyManagement {
        require(Auction(_auction).want() == want, "Invalid want");
        require(
            Auction(_auction).receiver() == rewardHandler,
            "Invalid receiver"
        );
        (, uint64 scaler, ) = Auction(_auction).auctions(address(asset));
        require(scaler != 0, "asset not enabled");

        auction = Auction(_auction);
    }

    function rescue(address _token) external onlyManagement {
        require(
            _token != want &&
                _token != address(asset) &&
                _token != address(vault) &&
                _token != address(this),
            "bad token"
        );
        ERC20(_token).safeTransfer(
            msg.sender,
            ERC20(_token).balanceOf(address(this))
        );
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.18;

import {Clonable} from "@periphery/utils/Clonable.sol";
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IStrategyInterface} from "./interfaces/IStrategyInterface.sol";

contract RewardHandler is Clonable {
    using SafeERC20 for ERC20;

    address public want;

    address public strategy;

    constructor() {
        original = address(this);
        strategy = address(1);
    }

    function clone() external returns (address) {
        return _clone();
    }

    function claimRewards() external {
        require(msg.sender == strategy, "not strategy");
        uint256 balance = ERC20(want).balanceOf(address(this));
        if (balance == 0) return;
        ERC20(want).forceApprove(strategy, balance);
        IStrategyInterface(strategy).notifyRewardAmount(want, balance);
    }

    function initialize(address _strategy) external {
        require(strategy == address(0), "Already initialized");
        require(_strategy != address(0), "bad strategy");

        address _want = IStrategyInterface(_strategy).want();

        want = _want;
        strategy = _strategy;
    }

    function rescue(address _token) external {
        require(
            msg.sender == IStrategyInterface(strategy).management(),
            "!management"
        );
        require(_token != want, "!want");
        ERC20(_token).safeTransfer(
            msg.sender,
            ERC20(_token).balanceOf(address(this))
        );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC4626.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";
import "../token/ERC20/extensions/IERC20Metadata.sol";

/**
 * @dev Interface of the ERC4626 "Tokenized Vault Standard", as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[ERC-4626].
 *
 * _Available since v4.7._
 */
interface IERC4626 is IERC20, IERC20Metadata {
    event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);

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

    /**
     * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
     *
     * - MUST be an ERC-20 token contract.
     * - MUST NOT revert.
     */
    function asset() external view returns (address assetTokenAddress);

    /**
     * @dev Returns the total amount of the underlying asset that is “managed” by Vault.
     *
     * - SHOULD include any compounding that occurs from yield.
     * - MUST be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT revert.
     */
    function totalAssets() external view returns (uint256 totalManagedAssets);

    /**
     * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToShares(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToAssets(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
     * through a deposit call.
     *
     * - MUST return a limited value if receiver is subject to some deposit limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
     * - MUST NOT revert.
     */
    function maxDeposit(address receiver) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
     *   call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
     *   in the same transaction.
     * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
     *   deposit would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewDeposit(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   deposit execution, and are accounted for during deposit.
     * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
     * - MUST return a limited value if receiver is subject to some mint limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
     * - MUST NOT revert.
     */
    function maxMint(address receiver) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
     *   in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
     *   same transaction.
     * - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
     *   would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by minting.
     */
    function previewMint(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
     *   execution, and are accounted for during mint.
     * - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function mint(uint256 shares, address receiver) external returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
     * Vault, through a withdraw call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxWithdraw(address owner) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
     *   call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
     *   called
     *   in the same transaction.
     * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
     *   the withdrawal would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewWithdraw(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   withdraw execution, and are accounted for during withdraw.
     * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
     * through a redeem call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxRedeem(address owner) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their redeemption at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
     *   in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
     *   same transaction.
     * - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
     *   redemption would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by redeeming.
     */
    function previewRedeem(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   redeem execution, and are accounted for during redeem.
     * - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.18;

import {BaseHooks, ERC20} from "../Hooks/BaseHooks.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {IVaultFactory} from "@yearn-vaults/interfaces/IVaultFactory.sol";

abstract contract TokenizedStaker is BaseHooks, ReentrancyGuard {
    using SafeERC20 for ERC20;

    struct Reward {
        /// @notice The only address able to top up rewards for a token (aka notifyRewardAmount()).
        address rewardsDistributor;
        /// @notice The duration of our rewards distribution for staking, default is 7 days.
        uint96 rewardsDuration;
        /// @notice The end (timestamp) of our current or most recent reward period.
        uint96 periodFinish;
        /**
         * @notice The last time rewards were updated, triggered by updateReward() or notifyRewardAmount().
         * @dev  Will be the timestamp of the update or the end of the period, whichever is earlier.
         */
        uint96 lastUpdateTime;
        /// @notice The distribution rate of reward token per second.
        uint128 rewardRate;
        /**
         * @notice The most recent stored amount for rewardPerToken().
         * @dev Updated every time anyone calls the updateReward() modifier.
         */
        uint128 rewardPerTokenStored;
        /**
         * @notice The last time a notifyRewardAmount was called.
         * @dev Used for lastRewardRate, a rewardRate equivalent for instant reward releases.
         */
        uint96 lastNotifyTime;
        /// @notice The last rewardRate before a notifyRewardAmount was called
        uint128 lastRewardRate;
    }

    /* ========== EVENTS ========== */

    event RewardTokenAdded(
        address indexed rewardToken,
        address indexed rewardsDistributor,
        uint256 rewardsDuration
    );
    event RewardAdded(address indexed rewardToken, uint256 reward);
    event RewardPaid(
        address indexed user,
        address indexed rewardToken,
        uint256 reward
    );
    event RewardsDistributorUpdated(
        address indexed rewardToken,
        address indexed rewardsDistributor
    );
    event RewardsDurationUpdated(
        address indexed rewardToken,
        uint256 newDuration
    );
    event ClaimForRecipientUpdated(
        address indexed staker,
        address indexed recipient
    );
    event NotifiedWithZeroSupply(address indexed rewardToken, uint256 reward);
    event Recovered(address token, uint256 amount);

    /* ========== MODIFIERS ========== */

    modifier updateReward(address _account) {
        _updateReward(_account);
        _;
    }

    function _updateReward(address _account) internal virtual {
        for (uint256 i; i < rewardTokens.length; ++i) {
            address rewardToken = rewardTokens[i];
            rewardData[rewardToken].rewardPerTokenStored = uint128(
                rewardPerToken(rewardToken)
            );
            rewardData[rewardToken].lastUpdateTime = uint96(
                lastTimeRewardApplicable(rewardToken)
            );
            if (_account != address(0)) {
                rewards[_account][rewardToken] = earned(_account, rewardToken);
                userRewardPerTokenPaid[_account][rewardToken] = rewardData[
                    rewardToken
                ].rewardPerTokenStored;
            }
        }
    }

    /// @notice Array containing the addresses of all of our reward tokens.
    address[] public rewardTokens;

    /// @notice The address of our reward token => reward info.
    mapping(address => Reward) public rewardData;

    /**
     * @notice Mapping for staker address => address that can claim+receive tokens for them.
     * @dev This mapping can only be updated by management.
     */
    mapping(address => address) public claimForRecipient;

    /**
     * @notice The amount of rewards allocated to a user per whole token staked.
     * @dev Note that this is not the same as amount of rewards claimed. Mapping order is user -> reward token -> amount
     */
    mapping(address => mapping(address => uint256))
        public userRewardPerTokenPaid;

    /**
     * @notice The amount of unclaimed rewards an account is owed.
     * @dev Mapping order is user -> reward token -> amount
     */
    mapping(address => mapping(address => uint256)) public rewards;

    uint256 internal constant PRECISION = 1e18;

    constructor(address _asset, string memory _name) BaseHooks(_asset, _name) {}

    function _preDepositHook(
        uint256 /* assets */,
        uint256 /* shares */,
        address receiver
    ) internal virtual override {
        _updateReward(receiver);
    }

    function _preWithdrawHook(
        uint256 /* assets */,
        uint256 /* shares */,
        address /* receiver */,
        address owner,
        uint256 /* maxLoss */
    ) internal virtual override {
        _updateReward(owner);
    }

    function _preTransferHook(
        address from,
        address to,
        uint256 /* amount */
    ) internal virtual override {
        _updateReward(from);
        _updateReward(to);
    }

    // Need to update fee recipients before reporting to ensure accurate accounting
    // since fees are issued as shares to the recipients outside normal functionality.
    function _preReportHook() internal virtual override {
        _updateReward(TokenizedStrategy.performanceFeeRecipient());
        (uint16 feeBps, address protocolFeeRecipient) = IVaultFactory(
            TokenizedStrategy.FACTORY()
        ).protocol_fee_config();
        if (feeBps > 0) {
            _updateReward(protocolFeeRecipient);
        }
    }

    /**
     * @notice Get all reward tokens.
     * @return rewardTokens Array of reward token addresses.
     */
    function getRewardTokens()
        external
        view
        virtual
        returns (address[] memory)
    {
        return rewardTokens;
    }

    /// @notice Either the current timestamp or end of the most recent period.
    function lastTimeRewardApplicable(
        address _rewardToken
    ) public view virtual returns (uint256) {
        return
            block.timestamp < rewardData[_rewardToken].periodFinish
                ? block.timestamp
                : rewardData[_rewardToken].periodFinish;
    }

    /// @notice Reward paid out per whole token.
    function rewardPerToken(
        address _rewardToken
    ) public view virtual returns (uint256) {
        // store in memory to save gas
        Reward memory _rewardData = rewardData[_rewardToken];
        uint256 totalSupply = _totalSupply();

        if (totalSupply == 0 || _rewardData.rewardsDuration == 1) {
            return _rewardData.rewardPerTokenStored;
        }

        return
            _rewardData.rewardPerTokenStored +
            (((lastTimeRewardApplicable(_rewardToken) -
                _rewardData.lastUpdateTime) *
                _rewardData.rewardRate *
                PRECISION) / totalSupply);
    }

    /// @notice Amount of reward token pending claim by an account.
    function earned(
        address _account,
        address _rewardToken
    ) public view virtual returns (uint256) {
        return
            (TokenizedStrategy.balanceOf(_account) *
                (rewardPerToken(_rewardToken) -
                    userRewardPerTokenPaid[_account][_rewardToken])) /
            PRECISION +
            rewards[_account][_rewardToken];
    }

    /**
     * @notice Amount of reward token(s) pending claim by an account.
     * @dev Checks for all rewardTokens.
     * @param _account Account to check earned balance for.
     * @return pending Amount of reward token(s) pending claim.
     */
    function earnedMulti(
        address _account
    ) public view virtual returns (uint256[] memory pending) {
        address[] memory _rewardTokens = rewardTokens;
        uint256 length = _rewardTokens.length;
        pending = new uint256[](length);

        for (uint256 i; i < length; ++i) {
            pending[i] = earned(_account, _rewardTokens[i]);
        }
    }

    /// @notice Reward tokens emitted over the entire rewardsDuration.
    function getRewardForDuration(
        address _rewardToken
    ) external view virtual returns (uint256) {
        // note that if rewards are instant released, this will always return zero
        return
            rewardData[_rewardToken].rewardRate *
            rewardData[_rewardToken].rewardsDuration;
    }

    /// @notice Correct Total supply for the locked shares from profits
    function _totalSupply() internal view virtual returns (uint256) {
        return
            TokenizedStrategy.totalSupply() -
            TokenizedStrategy.balanceOf(address(this));
    }

    /**
     * @notice Notify staking contract that it has more reward to account for.
     * @dev May only be called by rewards distribution role or management. Set up token first via addReward().
     * @param _rewardToken Address of the rewards token.
     * @param _rewardAmount Amount of reward tokens to add.
     */
    function notifyRewardAmount(
        address _rewardToken,
        uint256 _rewardAmount
    ) external virtual {
        require(
            rewardData[_rewardToken].rewardsDistributor == msg.sender ||
                msg.sender == TokenizedStrategy.management(),
            "!authorized"
        );

        // handle the transfer of reward tokens via `transferFrom` to reduce the number
        // of transactions required and ensure correctness of the reward amount
        ERC20(_rewardToken).safeTransferFrom(
            msg.sender,
            address(this),
            _rewardAmount
        );

        _notifyRewardAmount(_rewardToken, _rewardAmount);
    }

    function _notifyRewardAmount(
        address _rewardToken,
        uint256 _rewardAmount
    ) internal virtual updateReward(address(0)) {
        Reward memory _rewardData = rewardData[_rewardToken];
        require(_rewardAmount > 0 && _rewardAmount < 1e30, "bad reward value");

        // If total supply is 0, send tokens to management instead of reverting.
        // Prevent footguns if _notifyRewardInstant() is part of predeposit hooks.
        uint256 totalSupply = _totalSupply();
        if (totalSupply == 0) {
            address management = TokenizedStrategy.management();

            ERC20(_rewardToken).safeTransfer(management, _rewardAmount);
            emit NotifiedWithZeroSupply(_rewardToken, _rewardAmount);
            return;
        }

        // this is the only part of the struct that will be the same for instant or normal
        _rewardData.lastUpdateTime = uint96(block.timestamp);

        /// @dev A rewardsDuration of 1 dictates instant release of rewards
        if (_rewardData.rewardsDuration == 1) {
            // Update lastNotifyTime and lastRewardRate if needed (would revert if in the same block otherwise)
            if (uint96(block.timestamp) != _rewardData.lastNotifyTime) {
                _rewardData.lastRewardRate = uint128(
                    _rewardAmount /
                        (block.timestamp - _rewardData.lastNotifyTime)
                );
                _rewardData.lastNotifyTime = uint96(block.timestamp);
            }

            // Update rewardRate, lastUpdateTime, periodFinish
            _rewardData.rewardRate = 0;
            _rewardData.periodFinish = uint96(block.timestamp);

            // Instantly release rewards by modifying rewardPerTokenStored
            _rewardData.rewardPerTokenStored = uint128(
                _rewardData.rewardPerTokenStored +
                    (_rewardAmount * PRECISION) /
                    totalSupply
            );
        } else {
            // store current rewardRate
            _rewardData.lastRewardRate = _rewardData.rewardRate;
            _rewardData.lastNotifyTime = uint96(block.timestamp);

            // update our rewardData with our new rewardRate
            if (block.timestamp >= _rewardData.periodFinish) {
                _rewardData.rewardRate = uint128(
                    _rewardAmount / _rewardData.rewardsDuration
                );
            } else {
                _rewardData.rewardRate = uint128(
                    (_rewardAmount +
                        (_rewardData.periodFinish - block.timestamp) *
                        _rewardData.rewardRate) / _rewardData.rewardsDuration
                );
            }

            // update time-based struct fields
            _rewardData.periodFinish = uint96(
                block.timestamp + _rewardData.rewardsDuration
            );
        }

        // make sure we have enough reward token for our new rewardRate
        require(
            _rewardData.rewardRate <=
                (ERC20(_rewardToken).balanceOf(address(this)) /
                    _rewardData.rewardsDuration),
            "Not enough balance"
        );

        // write to storage
        rewardData[_rewardToken] = _rewardData;
        emit RewardAdded(_rewardToken, _rewardAmount);
    }

    /**
     * @notice Claim any (and all) earned reward tokens.
     * @dev Can claim rewards even if no tokens still staked.
     */
    function getReward()
        external
        virtual
        nonReentrant
        updateReward(msg.sender)
    {
        _getRewardFor(msg.sender, msg.sender);
    }

    /**
     * @notice Claim any (and all) earned reward tokens for another user.
     * @dev Mapping must be manually updated via management. Must be called by recipient.
     * @param _staker Address of the user to claim rewards for.
     */
    function getRewardFor(
        address _staker
    ) external virtual nonReentrant updateReward(_staker) {
        require(claimForRecipient[_staker] == msg.sender, "!recipient");
        _getRewardFor(_staker, msg.sender);
    }

    // internal function to get rewards.
    function _getRewardFor(
        address _staker,
        address _recipient
    ) internal virtual {
        for (uint256 i; i < rewardTokens.length; ++i) {
            address _rewardToken = rewardTokens[i];
            _getOneReward(_rewardToken, _staker, _recipient);
        }
    }

    /**
     * @notice Claim any one earned reward token.
     * @dev Can claim rewards even if no tokens still staked.
     * @param _rewardToken Address of the rewards token to claim.
     */
    function getOneReward(
        address _rewardToken
    ) external virtual nonReentrant updateReward(msg.sender) {
        _getOneReward(_rewardToken, msg.sender, msg.sender);
    }

    /**
     * @notice Claim any one earned reward token for another user.
     * @dev Can claim rewards even if no tokens still staked.
     * @param _rewardToken Address of the rewards token to claim.
     * @param _staker Address of the user to claim rewards for.
     */
    function getOneRewardFor(
        address _rewardToken,
        address _staker
    ) external virtual nonReentrant updateReward(_staker) {
        require(claimForRecipient[_staker] == msg.sender, "!recipient");
        _getOneReward(_rewardToken, _staker, msg.sender);
    }

    function _getOneReward(
        address _rewardToken,
        address _staker,
        address _recipient
    ) internal virtual {
        uint256 reward = rewards[_staker][_rewardToken];
        if (reward > 0) {
            rewards[_staker][_rewardToken] = 0;
            ERC20(_rewardToken).safeTransfer(_recipient, reward);
            emit RewardPaid(_staker, _rewardToken, reward);
        }
    }

    /// @notice Unstake all of the sender's tokens and claim any outstanding rewards.
    function exit() external virtual nonReentrant {
        redeem(
            TokenizedStrategy.balanceOf(msg.sender),
            msg.sender,
            msg.sender,
            10_000
        );
        _getRewardFor(msg.sender, msg.sender);
    }

    /**
     * @notice Add a new reward token to the staking contract.
     * @dev May only be called by management, and can't be set to zero address. Add reward tokens sparingly, as each new
     *  one will increase gas costs. This must be set before notifyRewardAmount can be used. A rewardsDuration of 1
     *  dictates instant release of rewards.
     * @param _rewardToken Address of the rewards token.
     * @param _rewardsDistributor Address of the rewards distributor.
     * @param _rewardsDuration The duration of our rewards distribution for staking in seconds. Set to 1 for instant
     *  rewards distribution.
     */
    function addReward(
        address _rewardToken,
        address _rewardsDistributor,
        uint256 _rewardsDuration
    ) external virtual onlyManagement {
        _addReward(_rewardToken, _rewardsDistributor, _rewardsDuration);
    }

    /// @dev Internal function to add a new reward token to the staking contract.
    function _addReward(
        address _rewardToken,
        address _rewardsDistributor,
        uint256 _rewardsDuration
    ) internal virtual {
        require(
            _rewardToken != address(0) && _rewardsDistributor != address(0),
            "No zero address"
        );
        require(_rewardsDuration > 0, "Must be >0");
        require(
            rewardData[_rewardToken].rewardsDuration == 0,
            "Reward already added"
        );

        rewardTokens.push(_rewardToken);
        rewardData[_rewardToken].rewardsDistributor = _rewardsDistributor;
        rewardData[_rewardToken].rewardsDuration = uint96(_rewardsDuration);

        emit RewardTokenAdded(
            _rewardToken,
            _rewardsDistributor,
            _rewardsDuration
        );
    }

    /**
     * @notice Set the rewards distributor for a reward token.
     * @dev May only be called by management.
     * @param _rewardToken Address of the rewards token.
     * @param _rewardsDistributor Address of the rewards distributor.
     */
    function setRewardsDistributor(
        address _rewardToken,
        address _rewardsDistributor
    ) external virtual onlyManagement {
        _setRewardsDistributor(_rewardToken, _rewardsDistributor);
    }

    function _setRewardsDistributor(
        address _rewardToken,
        address _rewardsDistributor
    ) internal virtual {
        require(
            rewardData[_rewardToken].rewardsDistributor != address(0),
            "Reward token not added"
        );
        require(_rewardsDistributor != address(0), "No zero address");

        rewardData[_rewardToken].rewardsDistributor = _rewardsDistributor;

        emit RewardsDistributorUpdated(_rewardToken, _rewardsDistributor);
    }

    /**
     * @notice Set the duration of our rewards period.
     * @dev May only be called by management, and must be done after most recent period ends.
     * @param _rewardToken Address of the rewards token.
     * @param _rewardsDuration New length of period in seconds. Set to 1 for instant rewards release.
     */
    function setRewardsDuration(
        address _rewardToken,
        uint256 _rewardsDuration
    ) external virtual onlyManagement {
        _setRewardsDuration(_rewardToken, _rewardsDuration);
    }

    function _setRewardsDuration(
        address _rewardToken,
        uint256 _rewardsDuration
    ) internal virtual {
        _updateReward(address(0));
        // Previous rewards period must be complete before changing the duration for the new period
        require(
            block.timestamp > rewardData[_rewardToken].periodFinish,
            "!period"
        );
        require(_rewardsDuration > 0, "Must be >0");
        rewardData[_rewardToken].rewardsDuration = uint96(_rewardsDuration);
        emit RewardsDurationUpdated(_rewardToken, _rewardsDuration);
    }

    /**
     * @notice Setup a staker-recipient pair.
     * @dev May only be called by management. Useful for contracts that can't handle extra reward tokens to direct
     *  rewards elsewhere.
     * @param _staker Address that holds the vault tokens.
     * @param _recipient Address to claim and receive extra rewards on behalf of _staker.
     */
    function setClaimFor(
        address _staker,
        address _recipient
    ) external virtual onlyManagement {
        _setClaimFor(_staker, _recipient);
    }

    /**
     * @notice Give another address permission to claim (and receive!) your rewards.
     * @dev Useful if we want to add in complex logic following rewards claim such as staking.
     * @param _recipient Address to claim and receive extra rewards on behalf of msg.sender.
     */
    function setClaimForSelf(address _recipient) external virtual {
        _setClaimFor(msg.sender, _recipient);
    }

    function _setClaimFor(
        address _staker,
        address _recipient
    ) internal virtual {
        require(_staker != address(0), "No zero address");
        claimForRecipient[_staker] = _recipient;
        emit ClaimForRecipientUpdated(_staker, _recipient);
    }

    /**
     * @notice Sweep out tokens accidentally sent here.
     * @dev May only be called by management. If a pool has multiple tokens to sweep out, call this once for each.
     * @param _tokenAddress Address of token to sweep.
     * @param _tokenAmount Amount of tokens to sweep.
     */
    function recoverERC20(
        address _tokenAddress,
        uint256 _tokenAmount
    ) external virtual onlyManagement {
        require(_tokenAddress != address(asset), "!asset");

        // can only recover reward tokens 90 days after last reward token ends
        bool isRewardToken;
        address[] memory _rewardTokens = rewardTokens;
        uint256 maxPeriodFinish;

        for (uint256 i; i < _rewardTokens.length; ++i) {
            uint256 rewardPeriodFinish = rewardData[_rewardTokens[i]]
                .periodFinish;
            if (rewardPeriodFinish > maxPeriodFinish) {
                maxPeriodFinish = rewardPeriodFinish;
            }

            if (_rewardTokens[i] == _tokenAddress) {
                isRewardToken = true;
            }
        }

        if (isRewardToken) {
            require(
                block.timestamp > maxPeriodFinish + 90 days,
                "wait >90 days"
            );

            // if we do this, automatically sweep all reward token
            _tokenAmount = ERC20(_tokenAddress).balanceOf(address(this));
        }

        ERC20(_tokenAddress).safeTransfer(
            TokenizedStrategy.management(),
            _tokenAmount
        );
        emit Recovered(_tokenAddress, _tokenAmount);
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

import {Maths} from "../libraries/Maths.sol";
import {ITaker} from "../interfaces/ITaker.sol";
import {GPv2Order} from "../libraries/GPv2Order.sol";
import {Governance2Step} from "../utils/Governance2Step.sol";
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

interface ICowSettlement {
    function domainSeparator() external view returns (bytes32);
}

/**
 *   @title Auction
 *   @author yearn.fi
 *   @notice General use dutch auction contract for token sales.
 */
contract Auction is Governance2Step, ReentrancyGuard {
    using GPv2Order for GPv2Order.Data;
    using SafeERC20 for ERC20;

    /// @notice Emitted when a new auction is enabled
    event AuctionEnabled(address indexed from, address indexed to);

    /// @notice Emitted when an auction is disabled.
    event AuctionDisabled(address indexed from, address indexed to);

    /// @notice Emitted when auction has been kicked.
    event AuctionKicked(address indexed from, uint256 available);

    /// @notice Emitted when the starting price is updated.
    event UpdatedStartingPrice(uint256 startingPrice);

    /// @notice Emitted when the step decay rate is updated.
    event UpdatedStepDecayRate(uint256 indexed stepDecayRate);

    /// @notice Emitted when the step duration is updated.
    event UpdatedStepDuration(uint256 indexed stepDuration);

    /// @notice Emitted when the auction is settled.
    event AuctionSettled(address indexed from);

    /// @notice Emitted when the auction is swept.
    event AuctionSwept(address indexed token, address indexed to);

    /// @dev Store address and scaler in one slot.
    struct TokenInfo {
        address tokenAddress;
        uint96 scaler;
    }

    /// @notice Store all the auction specific information.
    struct AuctionInfo {
        uint64 kicked;
        uint64 scaler;
        uint128 initialAvailable;
    }

    uint256 internal constant WAD = 1e18;

    address internal constant COW_SETTLEMENT =
        0x9008D19f58AAbD9eD0D60971565AA8510560ab41;

    address internal constant VAULT_RELAYER =
        0xC92E8bdf79f0507f65a392b0ab4667716BFE0110;

    /// @notice The time that each auction lasts.
    uint256 internal constant AUCTION_LENGTH = 1 days;

    /// @notice Struct to hold the info for `want`.
    TokenInfo internal wantInfo;

    /// @notice The address that will receive the funds in the auction.
    address public receiver;

    /// @notice The amount to start the auction at.
    /// @dev This is an unscaled "lot size" essentially to start the pricing in "want".
    ///   The kicked amount of _from is divided by this to get the per auction initial price.
    uint256 public startingPrice;

    /// @notice The time period for each price step in seconds.
    uint256 public stepDuration;

    /// @notice The decay rate per step in basis points (e.g., 50 for 0.5% decrease per step).
    uint256 public stepDecayRate;

    /// @notice Mapping from `from` token to its struct.
    mapping(address => AuctionInfo) public auctions;

    /// @notice Array of all the enabled auction for this contract.
    address[] public enabledAuctions;

    constructor() Governance2Step(msg.sender) {}

    /**
     * @notice Initializes the Auction contract with initial parameters.
     * @param _want Address this auction is selling to.
     * @param _receiver Address that will receive the funds from the auction.
     * @param _governance Address of the contract governance.
     * @param _startingPrice Starting price for each auction.
     */
    function initialize(
        address _want,
        address _receiver,
        address _governance,
        uint256 _startingPrice
    ) public virtual {
        require(stepDecayRate == 0, "initialized");
        require(_want != address(0), "ZERO ADDRESS");
        require(_startingPrice != 0, "starting price");
        require(_receiver != address(0), "receiver");
        // Cannot have more than 18 decimals.
        uint256 decimals = ERC20(_want).decimals();
        require(decimals <= 18, "unsupported decimals");

        // Set variables
        wantInfo = TokenInfo({
            tokenAddress: _want,
            scaler: uint96(WAD / 10 ** decimals)
        });

        receiver = _receiver;
        governance = _governance;
        emit GovernanceTransferred(address(0), _governance);
        startingPrice = _startingPrice;
        emit UpdatedStartingPrice(_startingPrice);

        // Default to 50bps every 60 seconds
        stepDuration = 60;
        emit UpdatedStepDuration(stepDuration);
        stepDecayRate = 50; // 50 basis points = 0.5% decay per step
        emit UpdatedStepDecayRate(stepDecayRate);
    }

    /*//////////////////////////////////////////////////////////////
                         VIEW METHODS
    //////////////////////////////////////////////////////////////*/

    function version() external pure returns (string memory) {
        return "1.0.3";
    }

    /**
     * @notice Get the address of this auctions want token.
     * @return . The want token.
     */
    function want() public view virtual returns (address) {
        return wantInfo.tokenAddress;
    }

    function auctionLength() public view virtual returns (uint256) {
        return AUCTION_LENGTH;
    }

    /**
     * @notice Get the available amount for the auction.
     * @param _from The address of the token to be auctioned.
     * @return . The available amount for the auction.
     */
    function available(address _from) public view virtual returns (uint256) {
        if (!isActive(_from)) return 0;

        return
            Maths.min(
                auctions[_from].initialAvailable,
                ERC20(_from).balanceOf(address(this))
            );
    }

    /**
     * @notice Get the kicked timestamp for the auction.
     * @param _from The address of the token to be auctioned.
     * @return . The kicked timestamp for the auction.
     */
    function kicked(address _from) external view virtual returns (uint256) {
        return auctions[_from].kicked;
    }

    /**
     * @notice Check if the auction is active.
     * @param _from The address of the token to be auctioned.
     * @return . Whether the auction is active.
     */
    function isActive(address _from) public view virtual returns (bool) {
        return auctions[_from].kicked + AUCTION_LENGTH >= block.timestamp;
    }

    /**
     * @notice Get all the enabled auctions.
     */
    function getAllEnabledAuctions()
        external
        view
        virtual
        returns (address[] memory)
    {
        return enabledAuctions;
    }

    /**
     * @notice Get the pending amount available for the next auction.
     * @dev Defaults to the auctions balance of the from token if no hook.
     * @param _from The address of the token to be auctioned.
     * @return uint256 The amount that can be kicked into the auction.
     */
    function kickable(address _from) external view virtual returns (uint256) {
        // If not enough time has passed then `kickable` is 0.
        if (isActive(_from)) return 0;

        // Use the full balance of this contract.
        return ERC20(_from).balanceOf(address(this));
    }

    /**
     * @notice Gets the amount of `want` needed to buy the available amount of `from`.
     * @param _from The address of the token to be auctioned.
     * @return . The amount of `want` needed to fulfill the take amount.
     */
    function getAmountNeeded(
        address _from
    ) external view virtual returns (uint256) {
        return
            _getAmountNeeded(
                auctions[_from],
                available(_from),
                block.timestamp
            );
    }

    /**
     * @notice Gets the amount of `want` needed to buy a specific amount of `from`.
     * @param _from The address of the token to be auctioned.
     * @param _amountToTake The amount of `from` to take in the auction.
     * @return . The amount of `want` needed to fulfill the take amount.
     */
    function getAmountNeeded(
        address _from,
        uint256 _amountToTake
    ) external view virtual returns (uint256) {
        return
            _getAmountNeeded(auctions[_from], _amountToTake, block.timestamp);
    }

    /**
     * @notice Gets the amount of `want` needed to buy a specific amount of `from` at a specific timestamp.
     * @param _from The address of the token to be auctioned.
     * @param _amountToTake The amount `from` to take in the auction.
     * @param _timestamp The specific timestamp for calculating the amount needed.
     * @return . The amount of `want` needed to fulfill the take amount.
     */
    function getAmountNeeded(
        address _from,
        uint256 _amountToTake,
        uint256 _timestamp
    ) external view virtual returns (uint256) {
        return _getAmountNeeded(auctions[_from], _amountToTake, _timestamp);
    }

    /**
     * @dev Return the amount of `want` needed to buy `_amountToTake`.
     */
    function _getAmountNeeded(
        AuctionInfo memory _auction,
        uint256 _amountToTake,
        uint256 _timestamp
    ) internal view virtual returns (uint256) {
        return
            // Scale _amountToTake to 1e18
            (_amountToTake *
                _auction.scaler *
                // Price is always 1e18
                _price(
                    _auction.kicked,
                    _auction.initialAvailable * _auction.scaler,
                    _timestamp
                )) /
            1e18 /
            // Scale back down to want.
            wantInfo.scaler;
    }

    /**
     * @notice Gets the price of the auction at the current timestamp.
     * @param _from The address of the token to be auctioned.
     * @return . The price of the auction.
     */
    function price(address _from) external view virtual returns (uint256) {
        return price(_from, block.timestamp);
    }

    /**
     * @notice Gets the price of the auction at a specific timestamp.
     * @param _from The address of the token to be auctioned.
     * @param _timestamp The specific timestamp for calculating the price.
     * @return . The price of the auction.
     */
    function price(
        address _from,
        uint256 _timestamp
    ) public view virtual returns (uint256) {
        // Get unscaled price and scale it down.
        return
            _price(
                auctions[_from].kicked,
                auctions[_from].initialAvailable * auctions[_from].scaler,
                _timestamp
            ) / wantInfo.scaler;
    }

    /**
     * @dev Internal function to calculate the scaled price based on auction parameters.
     * @param _kicked The timestamp the auction was kicked.
     * @param _available The initial available amount scaled 1e18.
     * @param _timestamp The specific timestamp for calculating the price.
     * @return . The calculated price scaled to 1e18.
     */
    function _price(
        uint256 _kicked,
        uint256 _available,
        uint256 _timestamp
    ) internal view virtual returns (uint256) {
        if (_available == 0) return 0;

        uint256 secondsElapsed = _timestamp - _kicked;

        if (secondsElapsed > AUCTION_LENGTH) return 0;

        // Calculate the number of price steps that have passed
        uint256 steps = secondsElapsed / stepDuration;

        // Convert basis points to ray multiplier (e.g., 50 bps = 0.995 * 1e27)
        // rayMultiplier = 1e27 - (basisPoints * 1e23)
        uint256 rayMultiplier = 1e27 - (stepDecayRate * 1e23);

        // Calculate the decay multiplier using the configurable decay rate per step
        uint256 decayMultiplier = Maths.rpow(rayMultiplier, steps);

        // Calculate initial price per token
        uint256 initialPrice = Maths.wdiv(startingPrice * 1e18, _available);

        // Apply the decay to get the current price
        return Maths.rmul(initialPrice, decayMultiplier);
    }

    /*//////////////////////////////////////////////////////////////
                            SETTERS
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Enables a new auction.
     * @param _from The address of the token to be auctioned.
     */
    function enable(address _from) external virtual onlyGovernance {
        address _want = want();
        require(_from != address(0) && _from != _want, "ZERO ADDRESS");
        require(auctions[_from].scaler == 0, "already enabled");

        // Cannot have more than 18 decimals.
        uint256 decimals = ERC20(_from).decimals();
        require(decimals <= 18, "unsupported decimals");

        // Store all needed info.
        auctions[_from].scaler = uint64(WAD / 10 ** decimals);

        ERC20(_from).forceApprove(VAULT_RELAYER, type(uint256).max);

        // Add to the array.
        enabledAuctions.push(_from);

        emit AuctionEnabled(_from, _want);
    }

    /**
     * @notice Disables an existing auction.
     * @dev Only callable by governance.
     * @param _from The address of the token being sold.
     */
    function disable(address _from) external virtual {
        disable(_from, 0);
    }

    /**
     * @notice Disables an existing auction.
     * @dev Only callable by governance.
     * @param _from The address of the token being sold.
     * @param _index The index the auctionId is at in the array.
     */
    function disable(
        address _from,
        uint256 _index
    ) public virtual onlyGovernance {
        // Make sure the auction was enabled.
        require(auctions[_from].scaler != 0, "not enabled");

        // Remove the struct.
        delete auctions[_from];

        ERC20(_from).forceApprove(VAULT_RELAYER, 0);

        // Remove the auction ID from the array.
        address[] memory _enabledAuctions = enabledAuctions;
        if (_enabledAuctions[_index] != _from) {
            // If the _index given is not the id find it.
            for (uint256 i = 0; i < _enabledAuctions.length; ++i) {
                if (_enabledAuctions[i] == _from) {
                    _index = i;
                    break;
                }
            }
        }

        // Move the id to the last spot if not there.
        if (_index < _enabledAuctions.length - 1) {
            _enabledAuctions[_index] = _enabledAuctions[
                _enabledAuctions.length - 1
            ];
            // Update the array.
            enabledAuctions = _enabledAuctions;
        }

        // Pop the id off the array.
        enabledAuctions.pop();

        emit AuctionDisabled(_from, want());
    }

    function isAnActiveAuction() public view returns (bool) {
        address[] memory _enabledAuctions = enabledAuctions;
        for (uint256 i = 0; i < _enabledAuctions.length; ++i) {
            if (isActive(_enabledAuctions[i])) {
                return true;
            }
        }
        return false;
    }

    /**
     * @notice Sets the starting price for the auction.
     * @dev This is an unscaled "lot size" essentially to start the pricing in "want".
     *   The kicked amount of _from is divided by this to get the per auction initial price.
     * @param _startingPrice The new starting price for the auction.
     */
    function setStartingPrice(
        uint256 _startingPrice
    ) external virtual onlyGovernance {
        require(_startingPrice != 0, "starting price");

        // Don't change the price when an auction is active.
        require(!isAnActiveAuction(), "active auction");

        startingPrice = _startingPrice;

        emit UpdatedStartingPrice(_startingPrice);
    }

    /**
     * @notice Sets the step decay rate for the auction.
     * @dev The decay rate is in basis points (e.g., 50 for 0.5% decay per step).
     * @param _stepDecayRate The new decay rate per step in basis points (max 10000 = 100%).
     */
    function setStepDecayRate(
        uint256 _stepDecayRate
    ) external virtual onlyGovernance {
        require(
            _stepDecayRate > 0 && _stepDecayRate < 10_000,
            "invalid decay rate"
        );

        // Don't change the decay rate when an auction is active.
        require(!isAnActiveAuction(), "active auction");

        stepDecayRate = _stepDecayRate;

        emit UpdatedStepDecayRate(_stepDecayRate);
    }

    /**
     * @notice Sets the step duration for the auction.
     * @param _stepDuration The new step duration in seconds.
     */
    function setStepDuration(
        uint256 _stepDuration
    ) external virtual onlyGovernance {
        require(
            _stepDuration != 0 && _stepDuration < AUCTION_LENGTH,
            "invalid step duration"
        );

        require(!isAnActiveAuction(), "active auction");

        stepDuration = _stepDuration;

        emit UpdatedStepDuration(_stepDuration);
    }

    /*//////////////////////////////////////////////////////////////
                      PARTICIPATE IN AUCTION
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Kicks off an auction, updating its status and making funds available for bidding.
     * @param _from The address of the token to be auctioned.
     * @return _available The available amount for bidding on in the auction.
     */
    function kick(
        address _from
    ) external virtual nonReentrant returns (uint256 _available) {
        return _kick(_from);
    }

    function _kick(
        address _from
    ) internal virtual returns (uint256 _available) {
        require(auctions[_from].scaler != 0, "not enabled");
        require(
            block.timestamp > auctions[_from].kicked + AUCTION_LENGTH,
            "too soon"
        );

        // Just use current balance.
        _available = ERC20(_from).balanceOf(address(this));

        require(_available != 0, "nothing to kick");

        // Update the auctions status.
        auctions[_from].kicked = uint64(block.timestamp);
        auctions[_from].initialAvailable = uint128(_available);

        emit AuctionKicked(_from, _available);
    }

    /**
     * @notice Take the token being sold in a live auction.
     * @dev Defaults to taking the full amount and sending to the msg sender.
     * @param _from The address of the token to be auctioned.
     * @return . The amount of fromToken taken in the auction.
     */
    function take(address _from) external virtual returns (uint256) {
        return _take(_from, type(uint256).max, msg.sender, new bytes(0));
    }

    /**
     * @notice Take the token being sold in a live auction with a specified maximum amount.
     * @dev Will send the funds to the msg sender.
     * @param _from The address of the token to be auctioned.
     * @param _maxAmount The maximum amount of fromToken to take in the auction.
     * @return . The amount of fromToken taken in the auction.
     */
    function take(
        address _from,
        uint256 _maxAmount
    ) external virtual returns (uint256) {
        return _take(_from, _maxAmount, msg.sender, new bytes(0));
    }

    /**
     * @notice Take the token being sold in a live auction.
     * @param _from The address of the token to be auctioned.
     * @param _maxAmount The maximum amount of fromToken to take in the auction.
     * @param _takerReceiver The address that will receive the fromToken.
     * @return _amountTaken The amount of fromToken taken in the auction.
     */
    function take(
        address _from,
        uint256 _maxAmount,
        address _takerReceiver
    ) external virtual returns (uint256) {
        return _take(_from, _maxAmount, _takerReceiver, new bytes(0));
    }

    /**
     * @notice Take the token being sold in a live auction.
     * @param _from The address of the token to be auctioned.
     * @param _maxAmount The maximum amount of fromToken to take in the auction.
     * @param _takerReceiver The address that will receive the fromToken.
     * @param _data The data signify the callback should be used and sent with it.
     * @return _amountTaken The amount of fromToken taken in the auction.
     */
    function take(
        address _from,
        uint256 _maxAmount,
        address _takerReceiver,
        bytes calldata _data
    ) external virtual returns (uint256) {
        return _take(_from, _maxAmount, _takerReceiver, _data);
    }

    /// @dev Implements the take of the auction.
    function _take(
        address _from,
        uint256 _maxAmount,
        address _takerReceiver,
        bytes memory _data
    ) internal virtual nonReentrant returns (uint256 _amountTaken) {
        AuctionInfo memory auction = auctions[_from];
        // Make sure the auction is active.
        require(
            auction.kicked + AUCTION_LENGTH >= block.timestamp,
            "not kicked"
        );

        // Max amount that can be taken.
        uint256 _available = available(_from);
        _amountTaken = _available > _maxAmount ? _maxAmount : _available;

        // Get the amount needed
        uint256 needed = _getAmountNeeded(
            auction,
            _amountTaken,
            block.timestamp
        );

        require(needed != 0, "zero needed");

        // Send `from`.
        ERC20(_from).safeTransfer(_takerReceiver, _amountTaken);

        // If the caller has specified data.
        if (_data.length != 0) {
            // Do the callback.
            ITaker(_takerReceiver).auctionTakeCallback(
                _from,
                msg.sender,
                _amountTaken,
                needed,
                _data
            );
        }

        // Cache the want address.
        address _want = want();

        // Pull `want`.
        ERC20(_want).safeTransferFrom(msg.sender, receiver, needed);

        // If the full amount is taken, end the auction.
        if (_amountTaken == _available) {
            auctions[_from].kicked = uint64(0);

            emit AuctionSettled(_from);
        }
    }

    /// @dev Validates a COW order signature.
    function isValidSignature(
        bytes32 _hash,
        bytes calldata signature
    ) external view returns (bytes4) {
        // Make sure `_take` has not already been entered.
        require(!_reentrancyGuardEntered(), "ReentrancyGuard: reentrant call");

        // Decode the signature to get the order.
        GPv2Order.Data memory order = abi.decode(signature, (GPv2Order.Data));

        AuctionInfo memory auction = auctions[address(order.sellToken)];

        // Get the current amount needed for the auction.
        uint256 paymentAmount = _getAmountNeeded(
            auction,
            order.sellAmount,
            block.timestamp
        );

        // Verify the order details.
        // Retreive domain seperator each time for chains it is not deployed on yet
        require(
            _hash ==
                order.hash(ICowSettlement(COW_SETTLEMENT).domainSeparator()),
            "bad order"
        );
        require(paymentAmount != 0, "zero amount");
        require(available(address(order.sellToken)) != 0, "zero available");
        require(order.feeAmount == 0, "fee");
        require(order.partiallyFillable, "partial fill");
        require(order.validTo < auction.kicked + AUCTION_LENGTH, "expired");
        require(order.appData == bytes32(0), "app data");
        require(order.buyAmount >= paymentAmount, "bad price");
        require(address(order.buyToken) == want(), "bad token");
        require(order.receiver == receiver, "bad receiver");
        require(order.sellAmount <= auction.initialAvailable, "bad amount");

        // If all checks pass, return the magic value
        return this.isValidSignature.selector;
    }

    /**
     * @notice Forces the auction to be kicked.
     * @dev Only callable by governance in replace of sweep settle and kick.
     * @param _from The address of the token to be auctioned.
     */
    function forceKick(address _from) external onlyGovernance {
        auctions[_from].kicked = uint64(0);
        _kick(_from);
    }

    /**
     * @notice Allows the auction to be stopped if the full amount is taken.
     * @param _from The address of the token to be auctioned.
     */
    function settle(address _from) external virtual {
        require(isActive(_from), "!active");
        require(ERC20(_from).balanceOf(address(this)) == 0, "!empty");

        auctions[_from].kicked = uint64(0);

        emit AuctionSettled(_from);
    }

    function sweep(address _token) external virtual onlyGovernance {
        ERC20(_token).safeTransfer(
            msg.sender,
            ERC20(_token).balanceOf(address(this))
        );

        emit AuctionSwept(_token, msg.sender);
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

contract Clonable {
    /// @notice Set to the address to auto clone from.
    address public original;

    /**
     * @notice Clone the contracts default `original` contract.
     * @return Address of the new Minimal Proxy clone.
     */
    function _clone() internal virtual returns (address) {
        return _clone(original);
    }

    /**
     * @notice Clone any `_original` contract.
     * @return _newContract Address of the new Minimal Proxy clone.
     */
    function _clone(
        address _original
    ) internal virtual returns (address _newContract) {
        // Copied from https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol
        bytes20 addressBytes = bytes20(_original);
        assembly {
            // EIP-1167 bytecode
            let clone_code := mload(0x40)
            mstore(
                clone_code,
                0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
            )
            mstore(add(clone_code, 0x14), addressBytes)
            mstore(
                add(clone_code, 0x28),
                0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
            )
            _newContract := create(0, clone_code, 0x37)
        }
    }
}

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

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    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);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.18;

import {ITokenizedStaker} from "@periphery/Bases/Staker/ITokenizedStaker.sol";

interface IStrategyInterface is ITokenizedStaker {
    // State variables
    function vault() external view returns (address);

    function want() external view returns (address);

    function rewardHandler() external view returns (address);

    function auction() external view returns (address);

    // Core functions
    function claimRewards() external;

    function balanceOfVault() external view returns (uint256);

    function valueOfVault() external view returns (uint256);

    function vaultsMaxWithdraw() external view returns (uint256);

    function setAuction(address _auction) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

import {Hooks} from "./Hooks.sol";
import {BaseHealthCheck, ERC20} from "../HealthCheck/BaseHealthCheck.sol";

/**
 *   @title Base Hooks
 *   @author Yearn.finance
 *   @notice This contract can be inherited by any Yearn
 *   strategy wishing to implement pre or post deposit, withdraw
 *   or transfer hooks in their strategy.
 */
abstract contract BaseHooks is BaseHealthCheck, Hooks {
    constructor(
        address _asset,
        string memory _name
    ) BaseHealthCheck(_asset, _name) {}

    // Deposit
    function deposit(
        uint256 assets,
        address receiver
    ) external virtual returns (uint256 shares) {
        _preDepositHook(assets, shares, receiver);
        shares = abi.decode(
            _delegateCall(
                abi.encodeCall(TokenizedStrategy.deposit, (assets, receiver))
            ),
            (uint256)
        );
        _postDepositHook(assets, shares, receiver);
    }

    // Mint
    function mint(
        uint256 shares,
        address receiver
    ) external virtual returns (uint256 assets) {
        _preDepositHook(assets, shares, receiver);
        assets = abi.decode(
            _delegateCall(
                abi.encodeCall(TokenizedStrategy.mint, (shares, receiver))
            ),
            (uint256)
        );
        _postDepositHook(assets, shares, receiver);
    }

    // Withdraw
    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) external virtual returns (uint256 shares) {
        return withdraw(assets, receiver, owner, 0);
    }

    function withdraw(
        uint256 assets,
        address receiver,
        address owner,
        uint256 maxLoss
    ) public virtual returns (uint256 shares) {
        _preWithdrawHook(assets, shares, receiver, owner, maxLoss);
        shares = abi.decode(
            _delegateCall(
                // Have to use encodeWithSignature due to overloading parameters.
                abi.encodeWithSignature(
                    "withdraw(uint256,address,address,uint256)",
                    assets,
                    receiver,
                    owner,
                    maxLoss
                )
            ),
            (uint256)
        );
        _postWithdrawHook(assets, shares, receiver, owner, maxLoss);
    }

    // Redeem
    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) external virtual returns (uint256) {
        // We default to not limiting a potential loss.
        return redeem(shares, receiver, owner, MAX_BPS);
    }

    function redeem(
        uint256 shares,
        address receiver,
        address owner,
        uint256 maxLoss
    ) public returns (uint256 assets) {
        _preWithdrawHook(assets, shares, receiver, owner, maxLoss);
        assets = abi.decode(
            _delegateCall(
                // Have to use encodeWithSignature due to overloading parameters.
                abi.encodeWithSignature(
                    "redeem(uint256,address,address,uint256)",
                    shares,
                    receiver,
                    owner,
                    maxLoss
                )
            ),
            (uint256)
        );
        _postWithdrawHook(assets, shares, receiver, owner, maxLoss);
    }

    // Transfer
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool success) {
        _preTransferHook(from, to, amount);
        success = abi.decode(
            _delegateCall(
                abi.encodeCall(
                    TokenizedStrategy.transferFrom,
                    (from, to, amount)
                )
            ),
            (bool)
        );
        _postTransferHook(from, to, amount, success);
    }

    // Transfer from
    function transfer(
        address to,
        uint256 amount
    ) external virtual returns (bool success) {
        _preTransferHook(msg.sender, to, amount);
        success = abi.decode(
            _delegateCall(
                abi.encodeCall(TokenizedStrategy.transfer, (to, amount))
            ),
            (bool)
        );
        _postTransferHook(msg.sender, to, amount, success);
    }

    function report() external virtual returns (uint256 profit, uint256 loss) {
        _preReportHook();
        (profit, loss) = abi.decode(
            _delegateCall(abi.encodeCall(TokenizedStrategy.report, ())),
            (uint256, uint256)
        );
        _postReportHook(profit, loss);
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.18;

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

interface IVaultFactory {
    event NewVault(address indexed vaultAddress, address indexed asset);
    event UpdateProtocolFeeBps(
        uint16 oldProtocolFeeBps,
        uint16 newProtocolFeeBps
    );
    event UpdateProtocolFeeRecipient(
        address oldProtocolFeeRecipient,
        address newProtocolFeeRecipient
    );
    event UpdateCustomProtocolFee(address vault, uint16 newCustomProtocolFee);
    event RemovedCustomProtocolFee(address vault);
    event FactoryShutdown();
    event UpdatePendingGovernance(address newPendingGovernance);
    event GovernanceTransferred(
        address previousGovernance,
        address newGovernance
    );

    function shutdown() external view returns (bool);

    function governance() external view returns (address);

    function pendingGovernance() external view returns (address);

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

    function use_custom_protocol_fee(address) external view returns (bool);

    function deploy_new_vault(
        address asset,
        string memory name,
        string memory symbol,
        address role_manager,
        uint256 profit_max_unlock_time
    ) external returns (address);

    function vault_original() external view returns (address);

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

    function protocol_fee_config()
        external
        view
        returns (uint16 fee_bps, address fee_recipient);

    function protocol_fee_config(
        address vault
    ) external view returns (uint16 fee_bps, address fee_recipient);

    function set_protocol_fee_bps(uint16 new_protocol_fee_bps) external;

    function set_protocol_fee_recipient(
        address new_protocol_fee_recipient
    ) external;

    function set_custom_protocol_fee_bps(
        address vault,
        uint16 new_custom_protocol_fee
    ) external;

    function remove_custom_protocol_fee(address vault) external;

    function shutdown_factory() external;

    function transferGovernance(address new_governance) external;

    function acceptGovernance() external;
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.18;

// Math library from https://github.com/ajna-finance/ajna-core/blob/master/src/libraries/internal/Maths.sol

/**
    @title  Maths library
    @notice Internal library containing common maths.
 */
library Maths {
    uint256 internal constant WAD = 1e18;
    uint256 internal constant RAY = 1e27;

    function wmul(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x * y + WAD / 2) / WAD;
    }

    function floorWmul(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x * y) / WAD;
    }

    function ceilWmul(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x * y + WAD - 1) / WAD;
    }

    function wdiv(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x * WAD + y / 2) / y;
    }

    function floorWdiv(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x * WAD) / y;
    }

    function ceilWdiv(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x * WAD + y - 1) / y;
    }

    function ceilDiv(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x + y - 1) / y;
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256) {
        return x >= y ? x : y;
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256) {
        return x <= y ? x : y;
    }

    function wad(uint256 x) internal pure returns (uint256) {
        return x * WAD;
    }

    function rmul(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x * y + RAY / 2) / RAY;
    }

    function rpow(uint256 x, uint256 n) internal pure returns (uint256 z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }

    /*************************/
    /*** Integer Functions ***/
    /*************************/

    function maxInt(int256 x, int256 y) internal pure returns (int256) {
        return x >= y ? x : y;
    }

    function minInt(int256 x, int256 y) internal pure returns (int256) {
        return x <= y ? x : y;
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

interface ITaker {
    function auctionTakeCallback(
        address _from,
        address _sender,
        uint256 _amountTaken,
        uint256 _amountNeeded,
        bytes calldata _data
    ) external;
}

// SPDX-License-Identifier: LGPL-3.0-or-later
pragma solidity ^0.8.0;

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

/// @title Gnosis Protocol v2 Order Library
/// @author Gnosis Developers
library GPv2Order {
    /// @dev The complete data for a Gnosis Protocol order. This struct contains
    /// all order parameters that are signed for submitting to GP.
    struct Data {
        ERC20 sellToken;
        ERC20 buyToken;
        address receiver;
        uint256 sellAmount;
        uint256 buyAmount;
        uint32 validTo;
        bytes32 appData;
        uint256 feeAmount;
        bytes32 kind;
        bool partiallyFillable;
        bytes32 sellTokenBalance;
        bytes32 buyTokenBalance;
    }

    /// @dev The order EIP-712 type hash for the [`GPv2Order.Data`] struct.
    ///
    /// This value is pre-computed from the following expression:
    /// ```
    /// keccak256(
    ///     "Order(" +
    ///         "address sellToken," +
    ///         "address buyToken," +
    ///         "address receiver," +
    ///         "uint256 sellAmount," +
    ///         "uint256 buyAmount," +
    ///         "uint32 validTo," +
    ///         "bytes32 appData," +
    ///         "uint256 feeAmount," +
    ///         "string kind," +
    ///         "bool partiallyFillable" +
    ///         "string sellTokenBalance" +
    ///         "string buyTokenBalance" +
    ///     ")"
    /// )
    /// ```
    bytes32 internal constant TYPE_HASH =
        hex"d5a25ba2e97094ad7d83dc28a6572da797d6b3e7fc6663bd93efb789fc17e489";

    /// @dev The marker value for a sell order for computing the order struct
    /// hash. This allows the EIP-712 compatible wallets to display a
    /// descriptive string for the order kind (instead of 0 or 1).
    ///
    /// This value is pre-computed from the following expression:
    /// ```
    /// keccak256("sell")
    /// ```
    bytes32 internal constant KIND_SELL =
        hex"f3b277728b3fee749481eb3e0b3b48980dbbab78658fc419025cb16eee346775";

    /// @dev The OrderKind marker value for a buy order for computing the order
    /// struct hash.
    ///
    /// This value is pre-computed from the following expression:
    /// ```
    /// keccak256("buy")
    /// ```
    bytes32 internal constant KIND_BUY =
        hex"6ed88e868af0a1983e3886d5f3e95a2fafbd6c3450bc229e27342283dc429ccc";

    /// @dev The TokenBalance marker value for using direct ERC20 balances for
    /// computing the order struct hash.
    ///
    /// This value is pre-computed from the following expression:
    /// ```
    /// keccak256("erc20")
    /// ```
    bytes32 internal constant BALANCE_ERC20 =
        hex"5a28e9363bb942b639270062aa6bb295f434bcdfc42c97267bf003f272060dc9";

    /// @dev The TokenBalance marker value for using Balancer Vault external
    /// balances (in order to re-use Vault ERC20 approvals) for computing the
    /// order struct hash.
    ///
    /// This value is pre-computed from the following expression:
    /// ```
    /// keccak256("external")
    /// ```
    bytes32 internal constant BALANCE_EXTERNAL =
        hex"abee3b73373acd583a130924aad6dc38cfdc44ba0555ba94ce2ff63980ea0632";

    /// @dev The TokenBalance marker value for using Balancer Vault internal
    /// balances for computing the order struct hash.
    ///
    /// This value is pre-computed from the following expression:
    /// ```
    /// keccak256("internal")
    /// ```
    bytes32 internal constant BALANCE_INTERNAL =
        hex"4ac99ace14ee0a5ef932dc609df0943ab7ac16b7583634612f8dc35a4289a6ce";

    /// @dev Marker address used to indicate that the receiver of the trade
    /// proceeds should the owner of the order.
    ///
    /// This is chosen to be `address(0)` for gas efficiency as it is expected
    /// to be the most common case.
    address internal constant RECEIVER_SAME_AS_OWNER = address(0);

    /// @dev The byte length of an order unique identifier.
    uint256 internal constant UID_LENGTH = 56;

    /// @dev Returns the actual receiver for an order. This function checks
    /// whether or not the [`receiver`] field uses the marker value to indicate
    /// it is the same as the order owner.
    ///
    /// @return receiver The actual receiver of trade proceeds.
    function actualReceiver(
        Data memory order,
        address owner
    ) internal pure returns (address receiver) {
        if (order.receiver == RECEIVER_SAME_AS_OWNER) {
            receiver = owner;
        } else {
            receiver = order.receiver;
        }
    }

    /// @dev Return the EIP-712 signing hash for the specified order.
    ///
    /// @param order The order to compute the EIP-712 signing hash for.
    /// @param domainSeparator The EIP-712 domain separator to use.
    /// @return orderDigest The 32 byte EIP-712 struct hash.
    function hash(
        Data memory order,
        bytes32 domainSeparator
    ) internal pure returns (bytes32 orderDigest) {
        bytes32 structHash;

        // NOTE: Compute the EIP-712 order struct hash in place. As suggested
        // in the EIP proposal, noting that the order struct has 10 fields, and
        // including the type hash `(12 + 1) * 32 = 416` bytes to hash.
        // <https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md#rationale-for-encodedata>
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let dataStart := sub(order, 32)
            let temp := mload(dataStart)
            mstore(dataStart, TYPE_HASH)
            structHash := keccak256(dataStart, 416)
            mstore(dataStart, temp)
        }

        // NOTE: Now that we have the struct hash, compute the EIP-712 signing
        // hash using scratch memory past the free memory pointer. The signing
        // hash is computed from `"\x19\x01" || domainSeparator || structHash`.
        // <https://docs.soliditylang.org/en/v0.7.6/internals/layout_in_memory.html#layout-in-memory>
        // <https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md#specification>
        // solhint-disable-next-line no-inline-assembly
        assembly {
            let freeMemoryPointer := mload(0x40)
            mstore(freeMemoryPointer, "\x19\x01")
            mstore(add(freeMemoryPointer, 2), domainSeparator)
            mstore(add(freeMemoryPointer, 34), structHash)
            orderDigest := keccak256(freeMemoryPointer, 66)
        }
    }

    /// @dev Packs order UID parameters into the specified memory location. The
    /// result is equivalent to `abi.encodePacked(...)` with the difference that
    /// it allows re-using the memory for packing the order UID.
    ///
    /// This function reverts if the order UID buffer is not the correct size.
    ///
    /// @param orderUid The buffer pack the order UID parameters into.
    /// @param orderDigest The EIP-712 struct digest derived from the order
    /// parameters.
    /// @param owner The address of the user who owns this order.
    /// @param validTo The epoch time at which the order will stop being valid.
    function packOrderUidParams(
        bytes memory orderUid,
        bytes32 orderDigest,
        address owner,
        uint32 validTo
    ) internal pure {
        require(orderUid.length == UID_LENGTH, "GPv2: uid buffer overflow");

        // NOTE: Write the order UID to the allocated memory buffer. The order
        // parameters are written to memory in **reverse order** as memory
        // operations write 32-bytes at a time and we want to use a packed
        // encoding. This means, for example, that after writing the value of
        // `owner` to bytes `20:52`, writing the `orderDigest` to bytes `0:32`
        // will **overwrite** bytes `20:32`. This is desirable as addresses are
        // only 20 bytes and `20:32` should be `0`s:
        //
        //        |           1111111111222222222233333333334444444444555555
        //   byte | 01234567890123456789012345678901234567890123456789012345
        // -------+---------------------------------------------------------
        //  field | [.........orderDigest..........][......owner.......][vT]
        // -------+---------------------------------------------------------
        // mstore |                         [000000000000000000000000000.vT]
        //        |                     [00000000000.......owner.......]
        //        | [.........orderDigest..........]
        //
        // Additionally, since Solidity `bytes memory` are length prefixed,
        // 32 needs to be added to all the offsets.
        //
        // solhint-disable-next-line no-inline-assembly
        assembly {
            mstore(add(orderUid, 56), validTo)
            mstore(add(orderUid, 52), owner)
            mstore(add(orderUid, 32), orderDigest)
        }
    }

    /// @dev Extracts specific order information from the standardized unique
    /// order id of the protocol.
    ///
    /// @param orderUid The unique identifier used to represent an order in
    /// the protocol. This uid is the packed concatenation of the order digest,
    /// the validTo order parameter and the address of the user who created the
    /// order. It is used by the user to interface with the contract directly,
    /// and not by calls that are triggered by the solvers.
    /// @return orderDigest The EIP-712 signing digest derived from the order
    /// parameters.
    /// @return owner The address of the user who owns this order.
    /// @return validTo The epoch time at which the order will stop being valid.
    function extractOrderUidParams(
        bytes calldata orderUid
    )
        internal
        pure
        returns (bytes32 orderDigest, address owner, uint32 validTo)
    {
        require(orderUid.length == UID_LENGTH, "GPv2: invalid uid");

        // Use assembly to efficiently decode packed calldata.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            orderDigest := calldataload(orderUid.offset)
            owner := shr(96, calldataload(add(orderUid.offset, 32)))
            validTo := shr(224, calldataload(add(orderUid.offset, 52)))
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

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

contract Governance2Step is Governance {
    /// @notice Emitted when the pending governance address is set.
    event UpdatePendingGovernance(address indexed newPendingGovernance);

    /// @notice Address that is set to take over governance.
    address public pendingGovernance;

    constructor(address _governance) Governance(_governance) {}

    /**
     * @notice Sets a new address as the `pendingGovernance` of the contract.
     * @dev Throws if the caller is not current governance.
     * @param _newGovernance The new governance address.
     */
    function transferGovernance(
        address _newGovernance
    ) external virtual override onlyGovernance {
        require(_newGovernance != address(0), "ZERO ADDRESS");
        pendingGovernance = _newGovernance;

        emit UpdatePendingGovernance(_newGovernance);
    }

    /**
     * @notice Allows the `pendingGovernance` to accept the role.
     */
    function acceptGovernance() external virtual {
        require(msg.sender == pendingGovernance, "!pending governance");

        emit GovernanceTransferred(governance, msg.sender);

        governance = msg.sender;
        pendingGovernance = address(0);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.18;

import {IStrategy} from "@tokenized-strategy/interfaces/IStrategy.sol";

interface ITokenizedStaker is IStrategy {
    struct Reward {
        /// @notice The only address able to top up rewards for a token (aka notifyRewardAmount()).
        address rewardsDistributor;
        /// @notice The duration of our rewards distribution for staking, default is 7 days.
        uint96 rewardsDuration;
        /// @notice The end (timestamp) of our current or most recent reward period.
        uint96 periodFinish;
        /**
         * @notice The last time r  ewards were updated, triggered by updateReward() or notifyRewardAmount().
         * @dev  Will be the timestamp of the update or the end of the period, whichever is earlier.
         */
        uint96 lastUpdateTime;
        /// @notice The distribution rate of reward token per second.
        uint128 rewardRate;
        /**
         * @notice The most recent stored amount for rewardPerToken().
         * @dev Updated every time anyone calls the updateReward() modifier.
         */
        uint128 rewardPerTokenStored;
        /**
         * @notice The last time a notifyRewardAmount was called.
         * @dev Used for lastRewardRate, a rewardRate equivalent for instant reward releases.
         */
        uint96 lastNotifyTime;
        /// @notice The last rewardRate before a notifyRewardAmount was called
        uint128 lastRewardRate;
    }

    /* ========== EVENTS ========== */

    event RewardTokenAdded(
        address indexed rewardToken,
        address indexed rewardsDistributor,
        uint256 rewardsDuration
    );
    event RewardAdded(address indexed rewardToken, uint256 reward);
    event RewardPaid(
        address indexed user,
        address indexed rewardToken,
        uint256 reward
    );
    event RewardsDistributorUpdated(
        address indexed rewardToken,
        address indexed rewardsDistributor
    );
    event RewardsDurationUpdated(
        address indexed rewardToken,
        uint256 newDuration
    );
    event ClaimForRecipientUpdated(
        address indexed staker,
        address indexed recipient
    );
    event NotifiedWithZeroSupply(address indexed rewardToken, uint256 reward);
    event Recovered(address token, uint256 amount);

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

    function rewardTokens(uint256 index) external view returns (address);

    function rewardToken(address) external view returns (address);

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

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

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

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

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

    function getRewardTokens() external view returns (address[] memory);

    function userRewardPerTokenPaid(
        address _account,
        address _rewardToken
    ) external view returns (uint256);

    function rewards(
        address _account,
        address _rewardToken
    ) external view returns (uint256);

    function claimForRecipient(address) external view returns (address);

    /* ========== FUNCTIONS ========== */
    function lastTimeRewardApplicable(
        address _rewardToken
    ) external view returns (uint256);

    function rewardPerToken(
        address _rewardToken
    ) external view returns (uint256);

    function earned(
        address _account,
        address _rewardToken
    ) external view returns (uint256);

    function earnedMulti(
        address _account
    ) external view returns (uint256[] memory);

    function getRewardForDuration(
        address _rewardToken
    ) external view returns (uint256);

    function notifyRewardAmount(
        address _rewardToken,
        uint256 _rewardAmount
    ) external;

    function getReward() external;

    function getRewardFor(address _staker) external;

    function exit() external;

    function setRewardsDistributor(
        address _rewardToken,
        address _rewardsDistributor
    ) external;

    function setRewardsDuration(
        address _rewardToken,
        uint256 _rewardsDuration
    ) external;

    function setClaimFor(address _staker, address _recipient) external;

    function setClaimForSelf(address _recipient) external;

    function rewardData(
        address rewardToken
    ) external view returns (Reward memory);

    function addReward(
        address _rewardToken,
        address _rewardsDistributor,
        uint256 _rewardsDuration
    ) external;

    function getOneReward(address _rewardToken) external;

    function getOneRewardFor(address _rewardToken, address _staker) external;

    function recoverERC20(address _tokenAddress, uint256 _tokenAmount) external;
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

contract DepositHooks {
    function _preDepositHook(
        uint256 assets,
        uint256 shares,
        address receiver
    ) internal virtual {}

    function _postDepositHook(
        uint256 assets,
        uint256 shares,
        address receiver
    ) internal virtual {}
}

contract WithdrawHooks {
    function _preWithdrawHook(
        uint256 assets,
        uint256 shares,
        address receiver,
        address owner,
        uint256 maxLoss
    ) internal virtual {}

    function _postWithdrawHook(
        uint256 assets,
        uint256 shares,
        address receiver,
        address owner,
        uint256 maxLoss
    ) internal virtual {}
}

contract TransferHooks {
    function _preTransferHook(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _postTransferHook(
        address from,
        address to,
        uint256 amount,
        bool success
    ) internal virtual {}
}

contract ReportHooks {
    function _preReportHook() internal virtual {}

    function _postReportHook(uint256 profit, uint256 loss) internal virtual {}
}

contract Hooks is DepositHooks, WithdrawHooks, TransferHooks, ReportHooks {}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

import {BaseStrategy, ERC20} from "@tokenized-strategy/BaseStrategy.sol";

/**
 *   @title Base Health Check
 *   @author Yearn.finance
 *   @notice This contract can be inherited by any Yearn
 *   V3 strategy wishing to implement a health check during
 *   the `report` function in order to prevent any unexpected
 *   behavior from being permanently recorded as well as the
 *   `checkHealth` modifier.
 *
 *   A strategist simply needs to inherit this contract. Set
 *   the limit ratios to the desired amounts and then
 *   override `_harvestAndReport()` just as they otherwise
 *  would. If the profit or loss that would be recorded is
 *   outside the acceptable bounds the tx will revert.
 *
 *   The healthcheck does not prevent a strategy from reporting
 *   losses, but rather can make sure manual intervention is
 *   needed before reporting an unexpected loss or profit.
 */
abstract contract BaseHealthCheck is BaseStrategy {
    // Can be used to determine if a healthcheck should be called.
    // Defaults to true;
    bool public doHealthCheck = true;

    uint256 internal constant MAX_BPS = 10_000;

    // Default profit limit to 100%.
    uint16 private _profitLimitRatio = uint16(MAX_BPS);

    // Defaults loss limit to 0.
    uint16 private _lossLimitRatio;

    constructor(
        address _asset,
        string memory _name
    ) BaseStrategy(_asset, _name) {}

    /**
     * @notice Returns the current profit limit ratio.
     * @dev Use a getter function to keep the variable private.
     * @return . The current profit limit ratio.
     */
    function profitLimitRatio() public view returns (uint256) {
        return _profitLimitRatio;
    }

    /**
     * @notice Returns the current loss limit ratio.
     * @dev Use a getter function to keep the variable private.
     * @return . The current loss limit ratio.
     */
    function lossLimitRatio() public view returns (uint256) {
        return _lossLimitRatio;
    }

    /**
     * @notice Set the `profitLimitRatio`.
     * @dev Denominated in basis points. I.E. 1_000 == 10%.
     * @param _newProfitLimitRatio The mew profit limit ratio.
     */
    function setProfitLimitRatio(
        uint256 _newProfitLimitRatio
    ) external onlyManagement {
        _setProfitLimitRatio(_newProfitLimitRatio);
    }

    /**
     * @dev Internally set the profit limit ratio. Denominated
     * in basis points. I.E. 1_000 == 10%.
     * @param _newProfitLimitRatio The mew profit limit ratio.
     */
    function _setProfitLimitRatio(uint256 _newProfitLimitRatio) internal {
        require(_newProfitLimitRatio > 0, "!zero profit");
        require(_newProfitLimitRatio <= type(uint16).max, "!too high");
        _profitLimitRatio = uint16(_newProfitLimitRatio);
    }

    /**
     * @notice Set the `lossLimitRatio`.
     * @dev Denominated in basis points. I.E. 1_000 == 10%.
     * @param _newLossLimitRatio The new loss limit ratio.
     */
    function setLossLimitRatio(
        uint256 _newLossLimitRatio
    ) external onlyManagement {
        _setLossLimitRatio(_newLossLimitRatio);
    }

    /**
     * @dev Internally set the loss limit ratio. Denominated
     * in basis points. I.E. 1_000 == 10%.
     * @param _newLossLimitRatio The new loss limit ratio.
     */
    function _setLossLimitRatio(uint256 _newLossLimitRatio) internal {
        require(_newLossLimitRatio < MAX_BPS, "!loss limit");
        _lossLimitRatio = uint16(_newLossLimitRatio);
    }

    /**
     * @notice Turns the healthcheck on and off.
     * @dev If turned off the next report will auto turn it back on.
     * @param _doHealthCheck Bool if healthCheck should be done.
     */
    function setDoHealthCheck(bool _doHealthCheck) public onlyManagement {
        doHealthCheck = _doHealthCheck;
    }

    /**
     * @notice OVerrides the default {harvestAndReport} to include a healthcheck.
     * @return _totalAssets New totalAssets post report.
     */
    function harvestAndReport()
        external
        override
        onlySelf
        returns (uint256 _totalAssets)
    {
        // Let the strategy report.
        _totalAssets = _harvestAndReport();

        // Run the healthcheck on the amount returned.
        _executeHealthCheck(_totalAssets);
    }

    /**
     * @dev To be called during a report to make sure the profit
     * or loss being recorded is within the acceptable bound.
     *
     * @param _newTotalAssets The amount that will be reported.
     */
    function _executeHealthCheck(uint256 _newTotalAssets) internal virtual {
        if (!doHealthCheck) {
            doHealthCheck = true;
            return;
        }

        // Get the current total assets from the implementation.
        uint256 currentTotalAssets = TokenizedStrategy.totalAssets();

        if (_newTotalAssets > currentTotalAssets) {
            require(
                ((_newTotalAssets - currentTotalAssets) <=
                    (currentTotalAssets * uint256(_profitLimitRatio)) /
                        MAX_BPS),
                "healthCheck"
            );
        } else if (currentTotalAssets > _newTotalAssets) {
            require(
                (currentTotalAssets - _newTotalAssets <=
                    ((currentTotalAssets * uint256(_lossLimitRatio)) /
                        MAX_BPS)),
                "healthCheck"
            );
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

contract Governance {
    /// @notice Emitted when the governance address is updated.
    event GovernanceTransferred(
        address indexed previousGovernance,
        address indexed newGovernance
    );

    modifier onlyGovernance() {
        _checkGovernance();
        _;
    }

    /// @notice Checks if the msg sender is the governance.
    function _checkGovernance() internal view virtual {
        require(governance == msg.sender, "!governance");
    }

    /// @notice Address that can set the default base fee and provider
    address public governance;

    constructor(address _governance) {
        governance = _governance;

        emit GovernanceTransferred(address(0), _governance);
    }

    /**
     * @notice Sets a new address as the governance of the contract.
     * @dev Throws if the caller is not current governance.
     * @param _newGovernance The new governance address.
     */
    function transferGovernance(
        address _newGovernance
    ) external virtual onlyGovernance {
        require(_newGovernance != address(0), "ZERO ADDRESS");
        address oldGovernance = governance;
        governance = _newGovernance;

        emit GovernanceTransferred(oldGovernance, _newGovernance);
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

import {ITokenizedStrategy} from "./ITokenizedStrategy.sol";
import {IBaseStrategy} from "./IBaseStrategy.sol";

interface IStrategy is IBaseStrategy, ITokenizedStrategy {}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

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

// TokenizedStrategy interface used for internal view delegateCalls.
import {ITokenizedStrategy} from "./interfaces/ITokenizedStrategy.sol";

/**
 * @title YearnV3 Base Strategy
 * @author yearn.finance
 * @notice
 *  BaseStrategy implements all of the required functionality to
 *  seamlessly integrate with the `TokenizedStrategy` implementation contract
 *  allowing anyone to easily build a fully permissionless ERC-4626 compliant
 *  Vault by inheriting this contract and overriding three simple functions.

 *  It utilizes an immutable proxy pattern that allows the BaseStrategy
 *  to remain simple and small. All standard logic is held within the
 *  `TokenizedStrategy` and is reused over any n strategies all using the
 *  `fallback` function to delegatecall the implementation so that strategists
 *  can only be concerned with writing their strategy specific code.
 *
 *  This contract should be inherited and the three main abstract methods
 *  `_deployFunds`, `_freeFunds` and `_harvestAndReport` implemented to adapt
 *  the Strategy to the particular needs it has to generate yield. There are
 *  other optional methods that can be implemented to further customize
 *  the strategy if desired.
 *
 *  All default storage for the strategy is controlled and updated by the
 *  `TokenizedStrategy`. The implementation holds a storage struct that
 *  contains all needed global variables in a manual storage slot. This
 *  means strategists can feel free to implement their own custom storage
 *  variables as they need with no concern of collisions. All global variables
 *  can be viewed within the Strategy by a simple call using the
 *  `TokenizedStrategy` variable. IE: TokenizedStrategy.globalVariable();.
 */
abstract contract BaseStrategy {
    /*//////////////////////////////////////////////////////////////
                            MODIFIERS
    //////////////////////////////////////////////////////////////*/
    /**
     * @dev Used on TokenizedStrategy callback functions to make sure it is post
     * a delegateCall from this address to the TokenizedStrategy.
     */
    modifier onlySelf() {
        _onlySelf();
        _;
    }

    /**
     * @dev Use to assure that the call is coming from the strategies management.
     */
    modifier onlyManagement() {
        TokenizedStrategy.requireManagement(msg.sender);
        _;
    }

    /**
     * @dev Use to assure that the call is coming from either the strategies
     * management or the keeper.
     */
    modifier onlyKeepers() {
        TokenizedStrategy.requireKeeperOrManagement(msg.sender);
        _;
    }

    /**
     * @dev Use to assure that the call is coming from either the strategies
     * management or the emergency admin.
     */
    modifier onlyEmergencyAuthorized() {
        TokenizedStrategy.requireEmergencyAuthorized(msg.sender);
        _;
    }

    /**
     * @dev Require that the msg.sender is this address.
     */
    function _onlySelf() internal view {
        require(msg.sender == address(this), "!self");
    }

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

    /**
     * @dev This is the address of the TokenizedStrategy implementation
     * contract that will be used by all strategies to handle the
     * accounting, logic, storage etc.
     *
     * Any external calls to the that don't hit one of the functions
     * defined in this base or the strategy will end up being forwarded
     * through the fallback function, which will delegateCall this address.
     *
     * This address should be the same for every strategy, never be adjusted
     * and always be checked before any integration with the Strategy.
     */
    address public constant tokenizedStrategyAddress =
        0xD377919FA87120584B21279a491F82D5265A139c;

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

    /**
     * @dev Underlying asset the Strategy is earning yield on.
     * Stored here for cheap retrievals within the strategy.
     */
    ERC20 internal immutable asset;

    /**
     * @dev This variable is set to address(this) during initialization of each strategy.
     *
     * This can be used to retrieve storage data within the strategy
     * contract as if it were a linked library.
     *
     *       i.e. uint256 totalAssets = TokenizedStrategy.totalAssets()
     *
     * Using address(this) will mean any calls using this variable will lead
     * to a call to itself. Which will hit the fallback function and
     * delegateCall that to the actual TokenizedStrategy.
     */
    ITokenizedStrategy internal immutable TokenizedStrategy;

    /**
     * @notice Used to initialize the strategy on deployment.
     *
     * This will set the `TokenizedStrategy` variable for easy
     * internal view calls to the implementation. As well as
     * initializing the default storage variables based on the
     * parameters and using the deployer for the permissioned roles.
     *
     * @param _asset Address of the underlying asset.
     * @param _name Name the strategy will use.
     */
    constructor(address _asset, string memory _name) {
        asset = ERC20(_asset);

        // Set instance of the implementation for internal use.
        TokenizedStrategy = ITokenizedStrategy(address(this));

        // Initialize the strategy's storage variables.
        _delegateCall(
            abi.encodeCall(
                ITokenizedStrategy.initialize,
                (_asset, _name, msg.sender, msg.sender, msg.sender)
            )
        );

        // Store the tokenizedStrategyAddress at the standard implementation
        // address storage slot so etherscan picks up the interface. This gets
        // stored on initialization and never updated.
        assembly {
            sstore(
                // keccak256('eip1967.proxy.implementation' - 1)
                0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc,
                tokenizedStrategyAddress
            )
        }
    }

    /*//////////////////////////////////////////////////////////////
                NEEDED TO BE OVERRIDDEN BY STRATEGIST
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Can deploy up to '_amount' of 'asset' in the yield source.
     *
     * This function is called at the end of a {deposit} or {mint}
     * call. Meaning that unless a whitelist is implemented it will
     * be entirely permissionless and thus can be sandwiched or otherwise
     * manipulated.
     *
     * @param _amount The amount of 'asset' that the strategy can attempt
     * to deposit in the yield source.
     */
    function _deployFunds(uint256 _amount) internal virtual;

    /**
     * @dev Should attempt to free the '_amount' of 'asset'.
     *
     * NOTE: The amount of 'asset' that is already loose has already
     * been accounted for.
     *
     * This function is called during {withdraw} and {redeem} calls.
     * Meaning that unless a whitelist is implemented it will be
     * entirely permissionless and thus can be sandwiched or otherwise
     * manipulated.
     *
     * Should not rely on asset.balanceOf(address(this)) calls other than
     * for diff accounting purposes.
     *
     * Any difference between `_amount` and what is actually freed will be
     * counted as a loss and passed on to the withdrawer. This means
     * care should be taken in times of illiquidity. It may be better to revert
     * if withdraws are simply illiquid so not to realize incorrect losses.
     *
     * @param _amount, The amount of 'asset' to be freed.
     */
    function _freeFunds(uint256 _amount) internal virtual;

    /**
     * @dev Internal function to harvest all rewards, redeploy any idle
     * funds and return an accurate accounting of all funds currently
     * held by the Strategy.
     *
     * This should do any needed harvesting, rewards selling, accrual,
     * redepositing etc. to get the most accurate view of current assets.
     *
     * NOTE: All applicable assets including loose assets should be
     * accounted for in this function.
     *
     * Care should be taken when relying on oracles or swap values rather
     * than actual amounts as all Strategy profit/loss accounting will
     * be done based on this returned value.
     *
     * This can still be called post a shutdown, a strategist can check
     * `TokenizedStrategy.isShutdown()` to decide if funds should be
     * redeployed or simply realize any profits/losses.
     *
     * @return _totalAssets A trusted and accurate account for the total
     * amount of 'asset' the strategy currently holds including idle funds.
     */
    function _harvestAndReport()
        internal
        virtual
        returns (uint256 _totalAssets);

    /*//////////////////////////////////////////////////////////////
                    OPTIONAL TO OVERRIDE BY STRATEGIST
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Optional function for strategist to override that can
     *  be called in between reports.
     *
     * If '_tend' is used tendTrigger() will also need to be overridden.
     *
     * This call can only be called by a permissioned role so may be
     * through protected relays.
     *
     * This can be used to harvest and compound rewards, deposit idle funds,
     * perform needed position maintenance or anything else that doesn't need
     * a full report for.
     *
     *   EX: A strategy that can not deposit funds without getting
     *       sandwiched can use the tend when a certain threshold
     *       of idle to totalAssets has been reached.
     *
     * This will have no effect on PPS of the strategy till report() is called.
     *
     * @param _totalIdle The current amount of idle funds that are available to deploy.
     */
    function _tend(uint256 _totalIdle) internal virtual {}

    /**
     * @dev Optional trigger to override if tend() will be used by the strategy.
     * This must be implemented if the strategy hopes to invoke _tend().
     *
     * @return . Should return true if tend() should be called by keeper or false if not.
     */
    function _tendTrigger() internal view virtual returns (bool) {
        return false;
    }

    /**
     * @notice Returns if tend() should be called by a keeper.
     *
     * @return . Should return true if tend() should be called by keeper or false if not.
     * @return . Calldata for the tend call.
     */
    function tendTrigger() external view virtual returns (bool, bytes memory) {
        return (
            // Return the status of the tend trigger.
            _tendTrigger(),
            // And the needed calldata either way.
            abi.encodeWithSelector(ITokenizedStrategy.tend.selector)
        );
    }

    /**
     * @notice Gets the max amount of `asset` that an address can deposit.
     * @dev Defaults to an unlimited amount for any address. But can
     * be overridden by strategists.
     *
     * This function will be called before any deposit or mints to enforce
     * any limits desired by the strategist. This can be used for either a
     * traditional deposit limit or for implementing a whitelist etc.
     *
     *   EX:
     *      if(isAllowed[_owner]) return super.availableDepositLimit(_owner);
     *
     * This does not need to take into account any conversion rates
     * from shares to assets. But should know that any non max uint256
     * amounts may be converted to shares. So it is recommended to keep
     * custom amounts low enough as not to cause overflow when multiplied
     * by `totalSupply`.
     *
     * @param . The address that is depositing into the strategy.
     * @return . The available amount the `_owner` can deposit in terms of `asset`
     */
    function availableDepositLimit(
        address /*_owner*/
    ) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    /**
     * @notice Gets the max amount of `asset` that can be withdrawn.
     * @dev Defaults to an unlimited amount for any address. But can
     * be overridden by strategists.
     *
     * This function will be called before any withdraw or redeem to enforce
     * any limits desired by the strategist. This can be used for illiquid
     * or sandwichable strategies. It should never be lower than `totalIdle`.
     *
     *   EX:
     *       return TokenIzedStrategy.totalIdle();
     *
     * This does not need to take into account the `_owner`'s share balance
     * or conversion rates from shares to assets.
     *
     * @param . The address that is withdrawing from the strategy.
     * @return . The available amount that can be withdrawn in terms of `asset`
     */
    function availableWithdrawLimit(
        address /*_owner*/
    ) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    /**
     * @dev Optional function for a strategist to override that will
     * allow management to manually withdraw deployed funds from the
     * yield source if a strategy is shutdown.
     *
     * This should attempt to free `_amount`, noting that `_amount` may
     * be more than is currently deployed.
     *
     * NOTE: This will not realize any profits or losses. A separate
     * {report} will be needed in order to record any profit/loss. If
     * a report may need to be called after a shutdown it is important
     * to check if the strategy is shutdown during {_harvestAndReport}
     * so that it does not simply re-deploy all funds that had been freed.
     *
     * EX:
     *   if(freeAsset > 0 && !TokenizedStrategy.isShutdown()) {
     *       depositFunds...
     *    }
     *
     * @param _amount The amount of asset to attempt to free.
     */
    function _emergencyWithdraw(uint256 _amount) internal virtual {}

    /*//////////////////////////////////////////////////////////////
                        TokenizedStrategy HOOKS
    //////////////////////////////////////////////////////////////*/

    /**
     * @notice Can deploy up to '_amount' of 'asset' in yield source.
     * @dev Callback for the TokenizedStrategy to call during a {deposit}
     * or {mint} to tell the strategy it can deploy funds.
     *
     * Since this can only be called after a {deposit} or {mint}
     * delegateCall to the TokenizedStrategy msg.sender == address(this).
     *
     * Unless a whitelist is implemented this will be entirely permissionless
     * and thus can be sandwiched or otherwise manipulated.
     *
     * @param _amount The amount of 'asset' that the strategy can
     * attempt to deposit in the yield source.
     */
    function deployFunds(uint256 _amount) external virtual onlySelf {
        _deployFunds(_amount);
    }

    /**
     * @notice Should attempt to free the '_amount' of 'asset'.
     * @dev Callback for the TokenizedStrategy to call during a withdraw
     * or redeem to free the needed funds to service the withdraw.
     *
     * This can only be called after a 'withdraw' or 'redeem' delegateCall
     * to the TokenizedStrategy so msg.sender == address(this).
     *
     * @param _amount The amount of 'asset' that the strategy should attempt to free up.
     */
    function freeFunds(uint256 _amount) external virtual onlySelf {
        _freeFunds(_amount);
    }

    /**
     * @notice Returns the accurate amount of all funds currently
     * held by the Strategy.
     * @dev Callback for the TokenizedStrategy to call during a report to
     * get an accurate accounting of assets the strategy controls.
     *
     * This can only be called after a report() delegateCall to the
     * TokenizedStrategy so msg.sender == address(this).
     *
     * @return . A trusted and accurate account for the total amount
     * of 'asset' the strategy currently holds including idle funds.
     */
    function harvestAndReport() external virtual onlySelf returns (uint256) {
        return _harvestAndReport();
    }

    /**
     * @notice Will call the internal '_tend' when a keeper tends the strategy.
     * @dev Callback for the TokenizedStrategy to initiate a _tend call in the strategy.
     *
     * This can only be called after a tend() delegateCall to the TokenizedStrategy
     * so msg.sender == address(this).
     *
     * We name the function `tendThis` so that `tend` calls are forwarded to
     * the TokenizedStrategy.

     * @param _totalIdle The amount of current idle funds that can be
     * deployed during the tend
     */
    function tendThis(uint256 _totalIdle) external virtual onlySelf {
        _tend(_totalIdle);
    }

    /**
     * @notice Will call the internal '_emergencyWithdraw' function.
     * @dev Callback for the TokenizedStrategy during an emergency withdraw.
     *
     * This can only be called after a emergencyWithdraw() delegateCall to
     * the TokenizedStrategy so msg.sender == address(this).
     *
     * We name the function `shutdownWithdraw` so that `emergencyWithdraw`
     * calls are forwarded to the TokenizedStrategy.
     *
     * @param _amount The amount of asset to attempt to free.
     */
    function shutdownWithdraw(uint256 _amount) external virtual onlySelf {
        _emergencyWithdraw(_amount);
    }

    /**
     * @dev Function used to delegate call the TokenizedStrategy with
     * certain `_calldata` and return any return values.
     *
     * This is used to setup the initial storage of the strategy, and
     * can be used by strategist to forward any other call to the
     * TokenizedStrategy implementation.
     *
     * @param _calldata The abi encoded calldata to use in delegatecall.
     * @return . The return value if the call was successful in bytes.
     */
    function _delegateCall(
        bytes memory _calldata
    ) internal returns (bytes memory) {
        // Delegate call the tokenized strategy with provided calldata.
        (bool success, bytes memory result) = tokenizedStrategyAddress
            .delegatecall(_calldata);

        // If the call reverted. Return the error.
        if (!success) {
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }

        // Return the result.
        return result;
    }

    /**
     * @dev Execute a function on the TokenizedStrategy and return any value.
     *
     * This fallback function will be executed when any of the standard functions
     * defined in the TokenizedStrategy are called since they wont be defined in
     * this contract.
     *
     * It will delegatecall the TokenizedStrategy implementation with the exact
     * calldata and return any relevant values.
     *
     */
    fallback() external {
        // load our target address
        address _tokenizedStrategyAddress = tokenizedStrategyAddress;
        // Execute external function using delegatecall and return any value.
        assembly {
            // Copy function selector and any arguments.
            calldatacopy(0, 0, calldatasize())
            // Execute function delegatecall.
            let result := delegatecall(
                gas(),
                _tokenizedStrategyAddress,
                0,
                calldatasize(),
                0,
                0
            )
            // Get any return value
            returndatacopy(0, 0, returndatasize())
            // Return any return value or error back to the caller
            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {IERC4626} from "@openzeppelin/contracts/interfaces/IERC4626.sol";
import {IERC20Permit} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol";

// Interface that implements the 4626 standard and the implementation functions
interface ITokenizedStrategy is IERC4626, IERC20Permit {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event StrategyShutdown();

    event NewTokenizedStrategy(
        address indexed strategy,
        address indexed asset,
        string apiVersion
    );

    event Reported(
        uint256 profit,
        uint256 loss,
        uint256 protocolFees,
        uint256 performanceFees
    );

    event UpdatePerformanceFeeRecipient(
        address indexed newPerformanceFeeRecipient
    );

    event UpdateKeeper(address indexed newKeeper);

    event UpdatePerformanceFee(uint16 newPerformanceFee);

    event UpdateManagement(address indexed newManagement);

    event UpdateEmergencyAdmin(address indexed newEmergencyAdmin);

    event UpdateProfitMaxUnlockTime(uint256 newProfitMaxUnlockTime);

    event UpdatePendingManagement(address indexed newPendingManagement);

    /*//////////////////////////////////////////////////////////////
                           INITIALIZATION
    //////////////////////////////////////////////////////////////*/

    function initialize(
        address _asset,
        string memory _name,
        address _management,
        address _performanceFeeRecipient,
        address _keeper
    ) external;

    /*//////////////////////////////////////////////////////////////
                    NON-STANDARD 4626 OPTIONS
    //////////////////////////////////////////////////////////////*/

    function withdraw(
        uint256 assets,
        address receiver,
        address owner,
        uint256 maxLoss
    ) external returns (uint256);

    function redeem(
        uint256 shares,
        address receiver,
        address owner,
        uint256 maxLoss
    ) external returns (uint256);

    function maxWithdraw(
        address owner,
        uint256 /*maxLoss*/
    ) external view returns (uint256);

    function maxRedeem(
        address owner,
        uint256 /*maxLoss*/
    ) external view returns (uint256);

    /*//////////////////////////////////////////////////////////////
                        MODIFIER HELPERS
    //////////////////////////////////////////////////////////////*/

    function requireManagement(address _sender) external view;

    function requireKeeperOrManagement(address _sender) external view;

    function requireEmergencyAuthorized(address _sender) external view;

    /*//////////////////////////////////////////////////////////////
                        KEEPERS FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    function tend() external;

    function report() external returns (uint256 _profit, uint256 _loss);

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

    function MAX_FEE() external view returns (uint16);

    function FACTORY() external view returns (address);

    /*//////////////////////////////////////////////////////////////
                            GETTERS
    //////////////////////////////////////////////////////////////*/

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

    function pricePerShare() external view returns (uint256);

    function management() external view returns (address);

    function pendingManagement() external view returns (address);

    function keeper() external view returns (address);

    function emergencyAdmin() external view returns (address);

    function performanceFee() external view returns (uint16);

    function performanceFeeRecipient() external view returns (address);

    function fullProfitUnlockDate() external view returns (uint256);

    function profitUnlockingRate() external view returns (uint256);

    function profitMaxUnlockTime() external view returns (uint256);

    function lastReport() external view returns (uint256);

    function isShutdown() external view returns (bool);

    function unlockedShares() external view returns (uint256);

    /*//////////////////////////////////////////////////////////////
                            SETTERS
    //////////////////////////////////////////////////////////////*/

    function setPendingManagement(address) external;

    function acceptManagement() external;

    function setKeeper(address _keeper) external;

    function setEmergencyAdmin(address _emergencyAdmin) external;

    function setPerformanceFee(uint16 _performanceFee) external;

    function setPerformanceFeeRecipient(
        address _performanceFeeRecipient
    ) external;

    function setProfitMaxUnlockTime(uint256 _profitMaxUnlockTime) external;

    function setName(string calldata _newName) external;

    function shutdownStrategy() external;

    function emergencyWithdraw(uint256 _amount) external;
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.18;

interface IBaseStrategy {
    function tokenizedStrategyAddress() external view returns (address);

    /*//////////////////////////////////////////////////////////////
                            IMMUTABLE FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    function availableDepositLimit(
        address _owner
    ) external view returns (uint256);

    function availableWithdrawLimit(
        address _owner
    ) external view returns (uint256);

    function deployFunds(uint256 _assets) external;

    function freeFunds(uint256 _amount) external;

    function harvestAndReport() external returns (uint256);

    function tendThis(uint256 _totalIdle) external;

    function shutdownWithdraw(uint256 _amount) external;

    function tendTrigger() external view returns (bool, bytes memory);
}

{
  "remappings": [
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "forge-std/=lib/forge-std/src/",
    "@tokenized-strategy/=lib/tokenized-strategy/src/",
    "@periphery/=lib/tokenized-strategy-periphery/src/",
    "@yearn-vaults/=lib/tokenized-strategy-periphery/lib/yearn-vaults-v3/contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/tokenized-strategy/lib/erc4626-tests/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "tokenized-strategy-periphery/=lib/tokenized-strategy-periphery/",
    "tokenized-strategy/=lib/tokenized-strategy/",
    "yearn-vaults-v3/=lib/tokenized-strategy-periphery/lib/yearn-vaults-v3/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : _asset (address): 0x203A662b0BD271A6ed5a60EdFbd04bFce608FD36
Arg [1] : _name (string): Yearn yvvbUSDC to yvvbETH Yield Splitter
Arg [2] : _vault (address): 0x80c34BD3A3569E126e7055831036aa7b212cB159
Arg [3] : _want (address): 0xE007CA01894c863d7898045ed5A3B4Abf0b18f37
Arg [4] : _rewardHandler (address): 0x00323ea34F327Ec4d99571edfd8a25CfBf2AE0Fe

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000203a662b0bd271a6ed5a60edfbd04bfce608fd36
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 00000000000000000000000080c34bd3a3569e126e7055831036aa7b212cb159
Arg [3] : 000000000000000000000000e007ca01894c863d7898045ed5a3b4abf0b18f37
Arg [4] : 00000000000000000000000000323ea34f327ec4d99571edfd8a25cfbf2ae0fe
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000028
Arg [6] : 596561726e20797676625553444320746f2079767662455448205969656c6420
Arg [7] : 53706c6974746572000000000000000000000000000000000000000000000000