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// SPDX-License-Identifier: GNU AGPLv3

pragma solidity 0.8.27;

import { 
    IERC20,
    IERC4626,
    ERC20,
    ERC4626
} from "@openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol";
import { ReentrancyGuard } from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";
import { MultistrategyManageable } from "src/abstracts/MultistrategyManageable.sol";
import { IMultistrategy } from "interfaces/infra/multistrategy/IMultistrategy.sol";
import { IStrategyAdapter } from "interfaces/infra/multistrategy/IStrategyAdapter.sol";
import { Errors } from "src/infra/libraries/Errors.sol";

contract Multistrategy is IMultistrategy, MultistrategyManageable, ERC4626, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using Math for uint256;
    
    /// @dev How much time it takes for the profit of a strategy to be unlocked.
    uint256 public constant PROFIT_UNLOCK_TIME = 3 days;

    /// @dev Used for locked profit calculations.
    uint256 public constant DEGRADATION_COEFFICIENT = 1 ether;

    /// @notice OpenZeppelin decimals offset used by the ERC4626 implementation.
    /// @dev Calculated to be max(0, 18 - underlyingDecimals) at construction, so the initial conversion rate maximizes
    /// precision between shares and assets.
    uint8 public immutable DECIMALS_OFFSET;

    /// @inheritdoc IMultistrategy
    uint256 public lastReport;
    
    /// @inheritdoc IMultistrategy
    uint256 public lockedProfit;

    /// @inheritdoc IMultistrategy
    uint256 public immutable lockedProfitDegradation;

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

    /// @dev Transfers ownership to the deployer of this contract
    /// @param _asset Address of the token used in this Multistrategy
    /// @param _manager Address of the initial Multistrategy manager
    /// @param _protocolFeeRecipient Address that will receive the performance fees
    /// @param _name Name of this Multistrategy receipt token
    /// @param _symbol Symbol of this Multistrategy receipt token
    constructor(
        address _asset,
        address _manager,
        address _protocolFeeRecipient,
        string memory _name,
        string memory _symbol
    ) 
        MultistrategyManageable(msg.sender, _manager, _protocolFeeRecipient)
        ERC4626(IERC20(_asset))
        ERC20(_name, _symbol)
    {   
        DECIMALS_OFFSET = uint8(Math.max(0, uint256(18) - IERC20Metadata(_asset).decimals()));
        performanceFee = 1000;
        lastReport = block.timestamp;
        lockedProfitDegradation = DEGRADATION_COEFFICIENT / PROFIT_UNLOCK_TIME;
    }

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

    /// @inheritdoc IERC4626
    function totalAssets() public view override returns (uint256) {
        return _liquidity() + totalDebt;
    }

    /// @inheritdoc IERC4626
    /// @dev Limited by the deposit limit
    function maxDeposit(address) public view override returns (uint256) {
        if(totalAssets() >= depositLimit) {
            return 0;
        } else {
            return depositLimit - totalAssets();
        }
    }

    /// @inheritdoc IERC4626
    /// @dev Limited by the deposit limit
    function maxMint(address _receiver) public view override returns (uint256) {
        return convertToShares(maxDeposit(_receiver));
    }

    /// @inheritdoc IERC4626
    function previewWithdraw(uint256 _assets) public view override returns (uint256) {
        uint256 shares = _convertToShares(_assets, Math.Rounding.Ceil);
        if(_assets <= _liquidity()) {
            return shares;
        } else {
            if(slippageLimit == MAX_BPS) return type(uint256).max;
            // Return the number of shares required at the current rate, accounting for slippage.
            return shares.mulDiv(MAX_BPS, MAX_BPS - slippageLimit, Math.Rounding.Ceil);
        }
    }

    /// @inheritdoc IERC4626
    function previewRedeem(uint256 _shares) public view override returns (uint256) {
        uint256 assets = _convertToAssets(_shares, Math.Rounding.Floor);
        if(assets <= _liquidity()) {
            return assets;
        } else {
            // Return the number of assets redeemable at the maximum permitted slippage.
            return assets.mulDiv(MAX_BPS - slippageLimit, MAX_BPS, Math.Rounding.Floor);
        }
    }

    /// @inheritdoc IMultistrategy
    function pricePerShare() external view returns (uint256) {
        return convertToAssets(1 ether);
    }

    /// @inheritdoc IMultistrategy
    function creditAvailable(address _strategy) external view returns (uint256) {
        return _creditAvailable(_strategy);
    }

    /// @inheritdoc IMultistrategy
    function debtExcess(address _strategy) external view returns (uint256) {
        return _debtExcess(_strategy);
    }

    /// @inheritdoc IMultistrategy
    function strategyTotalDebt(address _strategy) external view returns (uint256) {
        return strategies[_strategy].totalDebt;
    }

    function currentPnL() external view returns (uint256, uint256) {
        return _currentPnL();
    }

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

    /// @inheritdoc IERC4626
    function deposit(uint256 _assets, address _receiver) public override whenNotPaused whenNotRetired nonReentrant returns (uint256) {
        uint256 maxAssets = maxDeposit(_receiver);
        require(_assets <= maxAssets, ERC4626ExceededMaxDeposit(_receiver, _assets, maxAssets));

        uint256 shares = previewDeposit(_assets);
        _deposit(msg.sender, _receiver, _assets, shares);

        return shares;
    }

    /// @inheritdoc IERC4626
    function mint(uint256 _shares, address _receiver) public override whenNotPaused whenNotRetired nonReentrant returns (uint256) {
        uint256 maxShares = maxMint(_receiver);
        require(_shares <= maxShares, ERC4626ExceededMaxMint(_receiver, _shares, maxShares));

        uint256 assets = previewMint(_shares);
        _deposit(msg.sender, _receiver, assets, _shares);

        return assets;
    }

    /// @inheritdoc IERC4626
    function withdraw(uint256 _assets, address _receiver, address _owner) public override whenNotPaused nonReentrant returns (uint256) {
        uint256 maxAssets = maxWithdraw(_owner);
        require(_assets <= maxAssets, ERC4626ExceededMaxWithdraw(_owner, _assets, maxAssets));

        uint256 maxShares = previewWithdraw(_assets);
        (, uint256 shares) = _withdraw(msg.sender, _receiver, _owner, _assets, maxShares, false);

        require(shares <= maxShares, Errors.SlippageCheckFailed(maxShares, shares));

        return shares;
    }

    /// @inheritdoc IERC4626
    function redeem(uint256 _shares, address _receiver, address _owner) public override whenNotPaused nonReentrant returns (uint256) {
        uint256 maxShares = maxRedeem(_owner);
        require(_shares <= maxShares, ERC4626ExceededMaxRedeem(_owner, _shares, maxShares));

        uint256 minAssets = previewRedeem(_shares);
        (uint256 assets, ) = _withdraw(msg.sender, _receiver, _owner, minAssets, _shares, true);

        require(assets >= minAssets, Errors.SlippageCheckFailed(minAssets, assets));

        return assets;
    }

    /// @inheritdoc IMultistrategy
    function requestCredit() external whenNotPaused onlyActiveStrategy(msg.sender) returns (uint256) {
        return _requestCredit();
    }

    /// @inheritdoc IMultistrategy
    function strategyReport(uint256 _debtRepayment, uint256 _gain, uint256 _loss) 
        external 
        whenNotPaused
        onlyActiveStrategy(msg.sender)
    {
        _report(_debtRepayment, _gain, _loss);
    }

    /// @inheritdoc IMultistrategy
    function rescueToken(address _token, address _recipient) external onlyGuardian {
        _rescueToken(_token, _recipient);
    }

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

    /// @notice Internal view function to retrieve the current liquidity of the contract.
    /// @return The current liquidity (balance of the asset) of the contract.
    function _liquidity() internal view returns (uint256) {
        return IERC20(asset()).balanceOf(address(this));
    }

    /// @notice Converts a given amount of assets to shares, with specified rounding.
    /// @param _assets The amount of assets to convert to shares.
    /// @param rounding The rounding direction to apply during the conversion.
    /// @return The number of shares corresponding to the given amount of assets.
    function _convertToShares(uint256 _assets, Math.Rounding rounding) internal view override returns (uint256) {
        return _assets.mulDiv(totalSupply() + 10 ** _decimalsOffset(), _freeFunds() + 1, rounding);
    }

    /// @notice Convert a given amount of shares to assets, with specified rounding.
    /// @param _shares The number of shares to convert to assets.
    /// @param rounding The rounding direction to apply during the conversion.
    /// @return The amount of assets corresponding to the given number of shares.
    function _convertToAssets(uint256 _shares, Math.Rounding rounding) internal view override returns (uint256) {
        return _shares.mulDiv(_freeFunds() + 1, totalSupply() + 10 ** _decimalsOffset(), rounding);
    }

    /// @notice Calculates the available credit for a strategy.
    /// 
    /// This function performs the following actions:
    /// - Determines the total assets and debt limits for both the multi-strategy and the specific strategy.
    /// - Checks if the strategy or the multi-strategy has exceeded their respective debt limits, in which case no new credit is offered.
    /// - Calculates the potential credit as the difference between the strategy's debt limit and its current debt.
    /// - Limits the potential credit by the maximum available credit of the multi-strategy.
    /// - Ensures the potential credit is within the strategy's minimum and maximum debt delta bounds.
    /// - Returns zero if the available credit is below the strategy's minimum debt delta.
    /// - Returns the available credit, ensuring it does not exceed the strategy's maximum debt delta.
    /// 
    /// @param _strategy The address of the strategy for which to determine the available credit.
    /// @return The amount of credit available for the given strategy.
    function _creditAvailable(address _strategy) internal view returns (uint256) {
        uint256 mult_totalAssets = totalAssets();
        uint256 mult_debtLimit = debtRatio.mulDiv(mult_totalAssets, MAX_BPS);
        uint256 mult_totalDebt = totalDebt;

        uint256 strat_debtLimit = strategies[_strategy].debtRatio.mulDiv(mult_totalAssets, MAX_BPS);
        uint256 strat_totalDebt = strategies[_strategy].totalDebt;
        uint256 strat_minDebtDelta = strategies[_strategy].minDebtDelta;
        uint256 strat_maxDebtDelta = strategies[_strategy].maxDebtDelta;

        if(strat_totalDebt >= strat_debtLimit || mult_totalDebt >= mult_debtLimit){
            return 0;
        }

        uint256 credit = strat_debtLimit - strat_totalDebt;
        uint256 maxAvailableCredit = mult_debtLimit - mult_totalDebt;
        credit = Math.min(credit, maxAvailableCredit);

        // Bound to the minimum and maximum borrow limits
        if(credit < strat_minDebtDelta) {
            return 0;
        } else {
            return Math.min(credit, strat_maxDebtDelta);
        }
    }

    /// @notice Calculates the excess debt of a strategy.
    /// 
    /// This function performs the following actions:
    /// - If the overall debt ratio is zero, it returns the total debt of the strategy as excess debt.
    /// - Calculates the strategy's debt limit based on its debt ratio and the total assets.
    /// - If the strategy's total debt is less than or equal to its debt limit, it returns zero indicating no excess debt.
    /// - If the strategy's total debt exceeds its debt limit, it returns the difference as the excess debt.
    /// 
    /// @param _strategy The address of the strategy for which to determine the debt excess.
    /// @return The amount of excess debt for the given strategy.
    function _debtExcess(address _strategy) internal view returns (uint256) {
        if(debtRatio == 0) {
            return strategies[_strategy].totalDebt;
        }

        uint256 strat_debtLimit = strategies[_strategy].debtRatio.mulDiv(totalAssets(), MAX_BPS);
        uint256 strat_totalDebt = strategies[_strategy].totalDebt;

        if(strat_totalDebt <= strat_debtLimit) {
            return 0;
        } else {
            return strat_totalDebt - strat_debtLimit;
        }
    }
    
    /// @notice Calculates the free funds available in the contract.
    /// @return The amount of free funds available.
    function _freeFunds() internal view returns (uint256) {
        return totalAssets() - _calculateLockedProfit();
    }

    /// @notice Calculate the current locked profit.
    /// 
    /// This function performs the following actions:
    /// - Calculates the locked funds ratio based on the time elapsed since the last report and the locked profit degradation rate.
    /// - If the locked funds ratio is less than the degradation coefficient, it computes the remaining locked profit by reducing it proportionally.
    /// - If the locked funds ratio is greater than or equal to the degradation coefficient, it returns zero indicating no locked profit remains.
    /// 
    /// @return The calculated current locked profit.
    function _calculateLockedProfit() internal view returns (uint256) {
        uint256 lockedFundsRatio = (block.timestamp - lastReport) * lockedProfitDegradation;

        if(lockedFundsRatio < DEGRADATION_COEFFICIENT) {
            return lockedProfit - lockedFundsRatio.mulDiv(lockedProfit, DEGRADATION_COEFFICIENT);
        }
        return 0;
    }

    /**
     * @notice Calculates the current profit and loss (PnL) across all active strategies.
     * 
     * This function performs the following actions:
     * - Iterates through the `withdrawOrder` array, which defines the order in which strategies are withdrawn from.
     * - For each strategy in the `withdrawOrder`:
     *   - If the strategy address is zero, it breaks the loop, indicating the end of the list.
     *   - If the strategy has no debt, it skips to the next strategy.
     *   - Otherwise, it retrieves the current profit and loss (PnL) from the strategy by calling `currentPnL`.
     *   - Adds the strategy's profit to the total profit, after deducting the performance fee.
     *   - Adds the strategy's loss to the total loss.
     * - Returns the total profit and total loss across all active strategies.
     * 
     * @return totalProfit The total profit across all active strategies, after deducting the performance fee.
     * @return totalLoss The total loss across all active strategies.
     */
    function _currentPnL() internal view returns (uint256, uint256) {
        if (activeStrategies == 0) return (0, 0);
        uint256 totalProfit = 0;
        uint256 totalLoss = 0;

        for(uint8 i = 0; i < activeStrategies; ++i){
            address strategy = withdrawOrder[i];
            if(strategy == address(0)) break;
            if(strategies[strategy].totalDebt == 0) continue;

            (uint256 gain, uint256 loss) = IStrategyAdapter(strategy).currentPnL();
            totalProfit += gain.mulDiv(MAX_BPS - performanceFee, MAX_BPS);
            totalLoss += loss;
        }

        return (totalProfit, totalLoss);
    }

    function _decimalsOffset() internal view override returns (uint8) {
        return DECIMALS_OFFSET;
    }

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

    /// @notice Handles deposits into the contract.
    /// 
    /// This function performs the following actions:
    /// - Validates that the receiver address is not zero or the contract address itself.
    /// - Ensures that the deposited amount is greater than zero.
    /// - Transfers the assets from the caller to the contract.
    /// - Mints the corresponding shares for the receiver.
    /// - Emits a `Deposit` event with the caller, receiver, amount of assets, and number of shares.
    /// 
    /// @param _caller The address of the entity initiating the deposit.
    /// @param _receiver The address of the recipient to receive the shares.
    /// @param _assets The amount of assets being deposited.
    /// @param _shares The number of shares to be minted for the receiver.
    function _deposit(address _caller, address _receiver, uint256 _assets, uint256 _shares) internal override {
        require(_receiver != address(0) && _receiver != address(this), Errors.InvalidAddress(_receiver));
        require(_assets > 0, Errors.ZeroAmount(_assets));

        IERC20(asset()).safeTransferFrom(_caller, address(this), _assets);
        _mint(_receiver, _shares);

        emit Deposit(_caller, _receiver, _assets, _shares);
    }

    /// @notice Handles withdrawals from the contract.
    /// 
    /// This function performs the following actions:
    /// - If the caller is not the owner, it checks and spends the allowance for the withdrawal.
    /// - Ensures that the amount to be withdrawn is greater than zero.
    /// - If the requested withdrawal amount exceeds the available liquidity, it withdraws the necessary amount from the strategies in the withdrawal order.
    ///   - Iterates through the withdrawal queue, withdrawing from each strategy until the liquidity requirement is met or the queue is exhausted.
    ///   - Updates the total debt of both the strategy and the contract as assets are withdrawn.
    ///   - Requests the strategy to report, accounting for potential gains or losses.
    /// - Reverts if the withdrawal process does not result in sufficient liquidity.
    /// - Burns the corresponding shares and transfers the requested assets to the receiver.
    /// - Emits a `Withdraw` event with the caller, receiver, owner, amount of assets withdrawn, and shares burned.
    /// 
    /// @param _caller The address of the entity initiating the withdrawal.
    /// @param _receiver The address of the recipient to receive the withdrawn assets.
    /// @param _owner The address of the owner of the shares being withdrawn.
    /// @param _assets The amount of assets to withdraw.
    /// @param _shares The amount of shares to burn.
    /// @param _consumeAllShares True if all `_shares` should be used to withdraw. False if it should withdraw just `_assets`.
    /// @return The number of assets withdrawn and the shares burned as a result of the withdrawal.
    function _withdraw(
        address _caller,
        address _receiver,
        address _owner,
        uint256 _assets,
        uint256 _shares,
        bool _consumeAllShares
    ) internal returns (uint256, uint256) {
        require(_shares > 0, Errors.ZeroAmount(_shares));

        if (_caller != _owner) {
            _spendAllowance(_owner, _caller, _shares);
        }

        uint256 assets = _consumeAllShares ? _convertToAssets(_shares, Math.Rounding.Floor) : _assets;

        if(assets > _liquidity()) {
            for(uint8 i = 0; i <= withdrawOrder.length; ++i){
                address strategy = withdrawOrder[i];

                // We reached the end of the withdraw queue and assets are still higher than the liquidity
                require(strategy != address(0), Errors.InsufficientLiquidity(assets, _liquidity()));

                // We can't withdraw from a strategy more than what it has asked as credit.
                uint256 assetsToWithdraw = Math.min(assets - _liquidity(), strategies[strategy].totalDebt);
                if(assetsToWithdraw == 0) continue;

                uint256 withdrawn = IStrategyAdapter(strategy).withdraw(assetsToWithdraw);
                strategies[strategy].totalDebt -= withdrawn;
                totalDebt -= withdrawn;

                IStrategyAdapter(strategy).askReport();

                // Update assets, as a loss could have been reported and user should get less assets for
                // the same amount of shares.
                if(_consumeAllShares) assets = _convertToAssets(_shares, Math.Rounding.Floor);
                if(assets <= _liquidity()) break;
            }
        }

        uint256 shares = _consumeAllShares ? _shares : _convertToShares(assets, Math.Rounding.Ceil);
        _burn(_owner, shares);
        IERC20(asset()).safeTransfer(_receiver, assets);

        emit Withdraw(_caller, _receiver, _owner, assets, shares);

        return (assets, shares);
    }

    /// @notice Requests credit for an active strategy.
    /// 
    /// This function performs the following actions:
    /// - Calculates the available credit for the strategy using `_creditAvailable`.
    /// - If credit is available, it updates the total debt for the strategy and the multistrategy contract.
    /// - Transfers the calculated credit amount to the strategy.
    ///
    /// Emits a `CreditRequested` event.
    ///
    /// @dev This function should be called only by active strategies when they need to request credit.
    function _requestCredit() internal returns (uint256){
        uint256 credit = _creditAvailable(msg.sender);

        if(credit > 0) {
            strategies[msg.sender].totalDebt += credit;
            totalDebt += credit;
            IERC20(asset()).safeTransfer(msg.sender, credit);
            emit CreditRequested(msg.sender, credit);
        }
        
        return credit;
    }

    /// @notice Reports the performance of a strategy.
    /// 
    /// This function performs the following actions:
    /// - Validates that the reporting strategy does not claim both a gain and a loss simultaneously.
    /// - Checks that the strategy has sufficient tokens to cover the debt repayment and the gain.
    /// - If there is a loss, it realizes the loss.
    /// - Calculates and deducts the performance fee from the gain.
    /// - Determines the excess debt of the strategy.
    /// - Adjusts the strategy's and contract's total debt accordingly.
    /// - Calculates and updates the new locked profit after accounting for any losses.
    /// - Updates the reporting timestamps for the strategy and the contract.
    /// - Transfers the debt repayment and the gains to this contract.
    ///
    /// Emits a `StrategyReported` event.
    ///
    /// @param _debtRepayment The amount of debt being repaid by the strategy.
    /// @param _gain The amount of profit reported by the strategy.
    /// @param _loss The amount of loss reported by the strategy.
    function _report(uint256 _debtRepayment, uint256 _gain, uint256 _loss) internal {
        uint256 strategyBalance = IERC20(asset()).balanceOf(msg.sender);
        require(!(_gain > 0 && _loss > 0), Errors.GainLossMismatch());
        require(strategyBalance >= _debtRepayment + _gain, Errors.InsufficientBalance(strategyBalance, _debtRepayment + _gain));

        uint256 profit = 0;
        uint256 feesCollected = 0;
        if(_loss > 0) _reportLoss(msg.sender, _loss);
        if(_gain > 0) {
            feesCollected = _gain.mulDiv(performanceFee, MAX_BPS);
            profit = _gain - feesCollected;
        } 

        uint256 debtToRepay = Math.min(_debtRepayment, _debtExcess(msg.sender));
        if(debtToRepay > 0) {
            strategies[msg.sender].totalDebt -= debtToRepay;
            totalDebt -= debtToRepay;
        }
        
        uint256 newLockedProfit = _calculateLockedProfit() + profit;
        if(newLockedProfit > _loss) {
            lockedProfit = newLockedProfit - _loss;
        } else {
            lockedProfit = 0;
        }

        strategies[msg.sender].lastReport = block.timestamp;
        lastReport = block.timestamp;

        if(debtToRepay + _gain > 0) IERC20(asset()).safeTransferFrom(msg.sender, address(this), debtToRepay + _gain);
        if(feesCollected > 0) IERC20(asset()).safeTransfer(protocolFeeRecipient, feesCollected);

        emit StrategyReported(msg.sender, debtToRepay, profit, _loss);
    }

    /// @notice Reports a loss for a strategy.
    /// 
    /// This function performs the following actions:
    /// - Validates that the loss reported by the strategy does not exceed its total debt.
    /// - Updates the strategy's total loss by adding the reported loss.
    /// - Reduces the strategy's total debt by the reported loss.
    /// - Adjusts the contract's total debt by reducing it with the reported loss.
    ///
    /// @param _strategy The address of the strategy reporting the loss.
    /// @param _loss The amount of loss reported by the strategy.
    function _reportLoss(address _strategy, uint256 _loss) internal {
        require(_loss <= strategies[_strategy].totalDebt, Errors.InvalidStrategyLoss());

        strategies[_strategy].totalLoss += _loss;
        strategies[_strategy].totalDebt -= _loss;
        totalDebt -= _loss;
    }

    /// @notice Rescues tokens from the contract.
    /// 
    /// This function performs the following actions:
    /// - Retrieves the balance of the specified token in the contract.
    /// - Transfers the entire balance of the specified token to the recipient address.
    ///
    /// @param _token The address of the token to be rescued.
    /// @param _recipient The address to receive the rescued tokens.
    function _rescueToken(address _token, address _recipient) internal {
        require(_token != asset(), Errors.InvalidAddress(_token));

        uint256 amount = IERC20(_token).balanceOf(address(this));
        IERC20(_token).safeTransfer(_recipient, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/ERC4626.sol)

pragma solidity ^0.8.20;

import {IERC20, IERC20Metadata, ERC20} from "../ERC20.sol";
import {SafeERC20} from "../utils/SafeERC20.sol";
import {IERC4626} from "../../../interfaces/IERC4626.sol";
import {Math} from "../../../utils/math/Math.sol";

/**
 * @dev Implementation of the ERC4626 "Tokenized Vault Standard" as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[EIP-4626].
 *
 * This extension allows the minting and burning of "shares" (represented using the ERC20 inheritance) in exchange for
 * underlying "assets" through standardized {deposit}, {mint}, {redeem} and {burn} workflows. This contract extends
 * the ERC20 standard. Any additional extensions included along it would affect the "shares" token represented by this
 * contract and not the "assets" token which is an independent contract.
 *
 * [CAUTION]
 * ====
 * In empty (or nearly empty) ERC-4626 vaults, deposits are at high risk of being stolen through frontrunning
 * with a "donation" to the vault that inflates the price of a share. This is variously known as a donation or inflation
 * attack and is essentially a problem of slippage. Vault deployers can protect against this attack by making an initial
 * deposit of a non-trivial amount of the asset, such that price manipulation becomes infeasible. Withdrawals may
 * similarly be affected by slippage. Users can protect against this attack as well as unexpected slippage in general by
 * verifying the amount received is as expected, using a wrapper that performs these checks such as
 * https://github.com/fei-protocol/ERC4626#erc4626router-and-base[ERC4626Router].
 *
 * Since v4.9, this implementation uses virtual assets and shares to mitigate that risk. The `_decimalsOffset()`
 * corresponds to an offset in the decimal representation between the underlying asset's decimals and the vault
 * decimals. This offset also determines the rate of virtual shares to virtual assets in the vault, which itself
 * determines the initial exchange rate. While not fully preventing the attack, analysis shows that the default offset
 * (0) makes it non-profitable, as a result of the value being captured by the virtual shares (out of the attacker's
 * donation) matching the attacker's expected gains. With a larger offset, the attack becomes orders of magnitude more
 * expensive than it is profitable. More details about the underlying math can be found
 * xref:erc4626.adoc#inflation-attack[here].
 *
 * The drawback of this approach is that the virtual shares do capture (a very small) part of the value being accrued
 * to the vault. Also, if the vault experiences losses, the users try to exit the vault, the virtual shares and assets
 * will cause the first user to exit to experience reduced losses in detriment to the last users that will experience
 * bigger losses. Developers willing to revert back to the pre-v4.9 behavior just need to override the
 * `_convertToShares` and `_convertToAssets` functions.
 *
 * To learn more, check out our xref:ROOT:erc4626.adoc[ERC-4626 guide].
 * ====
 */
abstract contract ERC4626 is ERC20, IERC4626 {
    using Math for uint256;

    IERC20 private immutable _asset;
    uint8 private immutable _underlyingDecimals;

    /**
     * @dev Attempted to deposit more assets than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxDeposit(address receiver, uint256 assets, uint256 max);

    /**
     * @dev Attempted to mint more shares than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxMint(address receiver, uint256 shares, uint256 max);

    /**
     * @dev Attempted to withdraw more assets than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxWithdraw(address owner, uint256 assets, uint256 max);

    /**
     * @dev Attempted to redeem more shares than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxRedeem(address owner, uint256 shares, uint256 max);

    /**
     * @dev Set the underlying asset contract. This must be an ERC20-compatible contract (ERC20 or ERC777).
     */
    constructor(IERC20 asset_) {
        (bool success, uint8 assetDecimals) = _tryGetAssetDecimals(asset_);
        _underlyingDecimals = success ? assetDecimals : 18;
        _asset = asset_;
    }

    /**
     * @dev Attempts to fetch the asset decimals. A return value of false indicates that the attempt failed in some way.
     */
    function _tryGetAssetDecimals(IERC20 asset_) private view returns (bool, uint8) {
        (bool success, bytes memory encodedDecimals) = address(asset_).staticcall(
            abi.encodeCall(IERC20Metadata.decimals, ())
        );
        if (success && encodedDecimals.length >= 32) {
            uint256 returnedDecimals = abi.decode(encodedDecimals, (uint256));
            if (returnedDecimals <= type(uint8).max) {
                return (true, uint8(returnedDecimals));
            }
        }
        return (false, 0);
    }

    /**
     * @dev Decimals are computed by adding the decimal offset on top of the underlying asset's decimals. This
     * "original" value is cached during construction of the vault contract. If this read operation fails (e.g., the
     * asset has not been created yet), a default of 18 is used to represent the underlying asset's decimals.
     *
     * See {IERC20Metadata-decimals}.
     */
    function decimals() public view virtual override(IERC20Metadata, ERC20) returns (uint8) {
        return _underlyingDecimals + _decimalsOffset();
    }

    /** @dev See {IERC4626-asset}. */
    function asset() public view virtual returns (address) {
        return address(_asset);
    }

    /** @dev See {IERC4626-totalAssets}. */
    function totalAssets() public view virtual returns (uint256) {
        return _asset.balanceOf(address(this));
    }

    /** @dev See {IERC4626-convertToShares}. */
    function convertToShares(uint256 assets) public view virtual returns (uint256) {
        return _convertToShares(assets, Math.Rounding.Floor);
    }

    /** @dev See {IERC4626-convertToAssets}. */
    function convertToAssets(uint256 shares) public view virtual returns (uint256) {
        return _convertToAssets(shares, Math.Rounding.Floor);
    }

    /** @dev See {IERC4626-maxDeposit}. */
    function maxDeposit(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    /** @dev See {IERC4626-maxMint}. */
    function maxMint(address) public view virtual returns (uint256) {
        return type(uint256).max;
    }

    /** @dev See {IERC4626-maxWithdraw}. */
    function maxWithdraw(address owner) public view virtual returns (uint256) {
        return _convertToAssets(balanceOf(owner), Math.Rounding.Floor);
    }

    /** @dev See {IERC4626-maxRedeem}. */
    function maxRedeem(address owner) public view virtual returns (uint256) {
        return balanceOf(owner);
    }

    /** @dev See {IERC4626-previewDeposit}. */
    function previewDeposit(uint256 assets) public view virtual returns (uint256) {
        return _convertToShares(assets, Math.Rounding.Floor);
    }

    /** @dev See {IERC4626-previewMint}. */
    function previewMint(uint256 shares) public view virtual returns (uint256) {
        return _convertToAssets(shares, Math.Rounding.Ceil);
    }

    /** @dev See {IERC4626-previewWithdraw}. */
    function previewWithdraw(uint256 assets) public view virtual returns (uint256) {
        return _convertToShares(assets, Math.Rounding.Ceil);
    }

    /** @dev See {IERC4626-previewRedeem}. */
    function previewRedeem(uint256 shares) public view virtual returns (uint256) {
        return _convertToAssets(shares, Math.Rounding.Floor);
    }

    /** @dev See {IERC4626-deposit}. */
    function deposit(uint256 assets, address receiver) public virtual returns (uint256) {
        uint256 maxAssets = maxDeposit(receiver);
        if (assets > maxAssets) {
            revert ERC4626ExceededMaxDeposit(receiver, assets, maxAssets);
        }

        uint256 shares = previewDeposit(assets);
        _deposit(_msgSender(), receiver, assets, shares);

        return shares;
    }

    /** @dev See {IERC4626-mint}.
     *
     * As opposed to {deposit}, minting is allowed even if the vault is in a state where the price of a share is zero.
     * In this case, the shares will be minted without requiring any assets to be deposited.
     */
    function mint(uint256 shares, address receiver) public virtual returns (uint256) {
        uint256 maxShares = maxMint(receiver);
        if (shares > maxShares) {
            revert ERC4626ExceededMaxMint(receiver, shares, maxShares);
        }

        uint256 assets = previewMint(shares);
        _deposit(_msgSender(), receiver, assets, shares);

        return assets;
    }

    /** @dev See {IERC4626-withdraw}. */
    function withdraw(uint256 assets, address receiver, address owner) public virtual returns (uint256) {
        uint256 maxAssets = maxWithdraw(owner);
        if (assets > maxAssets) {
            revert ERC4626ExceededMaxWithdraw(owner, assets, maxAssets);
        }

        uint256 shares = previewWithdraw(assets);
        _withdraw(_msgSender(), receiver, owner, assets, shares);

        return shares;
    }

    /** @dev See {IERC4626-redeem}. */
    function redeem(uint256 shares, address receiver, address owner) public virtual returns (uint256) {
        uint256 maxShares = maxRedeem(owner);
        if (shares > maxShares) {
            revert ERC4626ExceededMaxRedeem(owner, shares, maxShares);
        }

        uint256 assets = previewRedeem(shares);
        _withdraw(_msgSender(), receiver, owner, assets, shares);

        return assets;
    }

    /**
     * @dev Internal conversion function (from assets to shares) with support for rounding direction.
     */
    function _convertToShares(uint256 assets, Math.Rounding rounding) internal view virtual returns (uint256) {
        return assets.mulDiv(totalSupply() + 10 ** _decimalsOffset(), totalAssets() + 1, rounding);
    }

    /**
     * @dev Internal conversion function (from shares to assets) with support for rounding direction.
     */
    function _convertToAssets(uint256 shares, Math.Rounding rounding) internal view virtual returns (uint256) {
        return shares.mulDiv(totalAssets() + 1, totalSupply() + 10 ** _decimalsOffset(), rounding);
    }

    /**
     * @dev Deposit/mint common workflow.
     */
    function _deposit(address caller, address receiver, uint256 assets, uint256 shares) internal virtual {
        // If _asset is ERC777, `transferFrom` can trigger a reentrancy BEFORE the transfer happens through the
        // `tokensToSend` hook. On the other hand, the `tokenReceived` hook, that is triggered after the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer before we mint so that any reentrancy would happen before the
        // assets are transferred and before the shares are minted, which is a valid state.
        // slither-disable-next-line reentrancy-no-eth
        SafeERC20.safeTransferFrom(_asset, caller, address(this), assets);
        _mint(receiver, shares);

        emit Deposit(caller, receiver, assets, shares);
    }

    /**
     * @dev Withdraw/redeem common workflow.
     */
    function _withdraw(
        address caller,
        address receiver,
        address owner,
        uint256 assets,
        uint256 shares
    ) internal virtual {
        if (caller != owner) {
            _spendAllowance(owner, caller, shares);
        }

        // If _asset is ERC777, `transfer` can trigger a reentrancy AFTER the transfer happens through the
        // `tokensReceived` hook. On the other hand, the `tokensToSend` hook, that is triggered before the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer after the burn so that any reentrancy would happen after the
        // shares are burned and after the assets are transferred, which is a valid state.
        _burn(owner, shares);
        SafeERC20.safeTransfer(_asset, receiver, assets);

        emit Withdraw(caller, receiver, owner, assets, shares);
    }

    function _decimalsOffset() internal view virtual returns (uint8) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    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
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // 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: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../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 An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, 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);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.encodeCall(token.approve, (spender, value));

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

    /**
     * @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);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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(token).code.length > 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
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: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)

pragma solidity ^0.8.20;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Muldiv operation overflow.
     */
    error MathOverflowedMulDiv();

    enum Rounding {
        Floor, // Toward negative infinity
        Ceil, // Toward positive infinity
        Trunc, // Toward zero
        Expand // Away from zero
    }

    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @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 towards infinity instead
     * of rounding towards zero.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        if (b == 0) {
            // Guarantee the same behavior as in a regular Solidity division.
            return a / b;
        }

        // (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 = x * y; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                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.
            if (denominator <= prod1) {
                revert MathOverflowedMulDiv();
            }

            ///////////////////////////////////////////////
            // 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.

            uint256 twos = denominator & (0 - denominator);
            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 (unsignedRoundsUp(rounding) && 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
     * towards zero.
     *
     * 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 + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2 of a positive value rounded towards zero.
     * 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 + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10 of a positive value rounded towards zero.
     * 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 + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256 of a positive value rounded towards zero.
     * 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 + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);
        }
    }

    /**
     * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.
     */
    function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {
        return uint8(rounding) % 2 == 1;
    }
}

// SPDX-License-Identifier: GNU AGPLv3

pragma solidity 0.8.27;

import { IERC4626 } from "@openzeppelin/contracts/interfaces/IERC4626.sol";
import { MultistrategyAdminable } from "src/abstracts/MultistrategyAdminable.sol";
import { IMultistrategyManageable } from "interfaces/infra/multistrategy/IMultistrategyManageable.sol";
import { IStrategyAdapter } from "interfaces/infra/multistrategy/IStrategyAdapter.sol";
import { MStrat } from "src/types/DataTypes.sol";
import { Errors } from "src/infra/libraries/Errors.sol";

abstract contract MultistrategyManageable is IMultistrategyManageable, MultistrategyAdminable {

    /// @dev Maximum amount of different strategies this contract can deposit into
    uint8 constant MAXIMUM_STRATEGIES = 10;

    /// @dev Maximum basis points (10_000 = 100%)
    uint256 constant MAX_BPS = 10_000;

    /// @dev Maximum performance fee that the owner can set is 20%
    uint256 constant MAX_PERFORMANCE_FEE = 2_000;
    
    /// @inheritdoc IMultistrategyManageable
    address public protocolFeeRecipient;

    /// @inheritdoc IMultistrategyManageable
    uint256 public performanceFee;

    /// @inheritdoc IMultistrategyManageable
    uint256 public depositLimit;

    /// @inheritdoc IMultistrategyManageable
    uint256 public debtRatio;

    /// @inheritdoc IMultistrategyManageable
    uint256 public totalDebt;

    /// @inheritdoc IMultistrategyManageable
    uint256 public slippageLimit;

    /// @inheritdoc IMultistrategyManageable
    uint8 public activeStrategies;

    /// @inheritdoc IMultistrategyManageable
    bool public retired;

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

    /// @dev Strategy parameters mapped by the strategy address
    mapping(address strategyAddress => MStrat.StrategyParams strategyParameters) public strategies;

    /// @dev Order that `_withdraw()` uses to determine which strategy pull the funds from
    //       The first time a zero address is encountered, it stops withdrawing, so it is
    //       possible that there isn't enough to withdraw if the amount of strategies in
    //       `withdrawOrder` is smaller than the amount of active strategies.
    address[] public withdrawOrder;

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

    /// @dev Initial owner is the deployer of the multistrategy.
    /// @param _owner Address of the initial Multistrategy owner.
    /// @param _manager Address of the initial Multistrategy manager.
    /// @param _protocolFeeRecipient Address that will receive the performance fee.
    constructor(
        address _owner,
        address _manager,
        address _protocolFeeRecipient
    ) 
        MultistrategyAdminable(_owner, _manager) 
    {
        require(_protocolFeeRecipient != address(0), Errors.ZeroAddress());

        protocolFeeRecipient = _protocolFeeRecipient;
        withdrawOrder = new address[](MAXIMUM_STRATEGIES);
    }

    /*//////////////////////////////////////////////////////////////////////////
                                    MODIFIER
    //////////////////////////////////////////////////////////////////////////*/

    /// @dev Reverts if `_strategy` is not active.
    /// @param _strategy Address of the strategy to check if it is active. 
    modifier onlyActiveStrategy(address _strategy) {
        require(strategies[_strategy].activation > 0, Errors.StrategyNotActive(_strategy));
        _;
    }

    /// @dev Reverts if the multistrategy has been retired / eol.
    modifier whenNotRetired() {
        require(retired == false, Errors.Retired());
        _;
    }

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

    /// @inheritdoc IMultistrategyManageable
    function getWithdrawOrder() external view returns (address[] memory) {
        return withdrawOrder;
    }

    /// @inheritdoc IMultistrategyManageable
    function getStrategyParameters(address _strategy) external view returns (MStrat.StrategyParams memory) {
        return strategies[_strategy];
    }

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

    /// @inheritdoc IMultistrategyManageable
    function setProtocolFeeRecipient(address _protocolFeeRecipient) external onlyOwner {
        require(_protocolFeeRecipient != address(0), Errors.ZeroAddress());

        protocolFeeRecipient = _protocolFeeRecipient;
        emit ProtocolFeeRecipientSet(protocolFeeRecipient);
    }

    /// @inheritdoc IMultistrategyManageable
    function setPerformanceFee(uint256 _performanceFee) external onlyOwner {
        require(_performanceFee <= MAX_PERFORMANCE_FEE, Errors.ExcessiveFee(_performanceFee));

        performanceFee = _performanceFee;
        emit PerformanceFeeSet(performanceFee);
    }

    /// @inheritdoc IMultistrategyManageable
    function setDepositLimit(uint256 _depositLimit) external onlyManager {
        depositLimit = _depositLimit;
        emit DepositLimitSet(depositLimit);
    }

    function setSlippageLimit(uint256 _slippageLimit) external onlyManager {
        require(_slippageLimit <= MAX_BPS, Errors.SlippageLimitExceeded(_slippageLimit));
        
        slippageLimit = _slippageLimit;
        emit SlippageLimitSet(slippageLimit);
    }

    /// @inheritdoc IMultistrategyManageable
    function setWithdrawOrder(address[] memory _strategies) external onlyManager {
        require(_validateStrategyOrder(_strategies), Errors.InvalidWithdrawOrder());

        withdrawOrder = _strategies;
        emit WithdrawOrderSet();
    }

    /// @inheritdoc IMultistrategyManageable
    function addStrategy(
        address _strategy,
        uint256 _debtRatio,
        uint256 _minDebtDelta,
        uint256 _maxDebtDelta
    ) external onlyOwner {
        require(activeStrategies < MAXIMUM_STRATEGIES, Errors.MaximumAmountStrategies());
        require(_strategy != address(0) && _strategy != address(this), Errors.InvalidAddress(_strategy));
        require(strategies[_strategy].activation == 0, Errors.StrategyAlreadyActive(_strategy));
        require(IERC4626(address(this)).asset() == IStrategyAdapter(_strategy).asset(), 
            Errors.AssetMismatch(IERC4626(address(this)).asset(), IStrategyAdapter(_strategy).asset()));
        require(debtRatio + _debtRatio <=  MAX_BPS, Errors.DebtRatioAboveMaximum(debtRatio + _debtRatio));
        require(_minDebtDelta <= _maxDebtDelta, Errors.InvalidDebtDelta());

        strategies[_strategy] = MStrat.StrategyParams({
            activation: block.timestamp,
            debtRatio: _debtRatio,
            lastReport: block.timestamp,
            minDebtDelta: _minDebtDelta,
            maxDebtDelta: _maxDebtDelta,
            totalDebt: 0,
            totalGain: 0,
            totalLoss: 0
        });

        debtRatio += _debtRatio;
        withdrawOrder[MAXIMUM_STRATEGIES - 1] = _strategy;
        ++activeStrategies;

        _organizeWithdrawOrder();

        emit StrategyAdded(_strategy);
    }

    /// @inheritdoc IMultistrategyManageable
    function retireStrategy(address _strategy) external onlyManager onlyActiveStrategy(_strategy) {
        debtRatio -= strategies[_strategy].debtRatio;
        strategies[_strategy].debtRatio = 0;

        emit StrategyRetired(_strategy);
    }

    /// @inheritdoc IMultistrategyManageable
    function removeStrategy(address _strategy) external onlyManager onlyActiveStrategy(_strategy) {
        require(strategies[_strategy].debtRatio == 0, Errors.StrategyNotRetired());
        require(strategies[_strategy].totalDebt == 0, Errors.StrategyWithOutstandingDebt());

        for(uint8 i = 0; i < MAXIMUM_STRATEGIES; ++i) {
            if(withdrawOrder[i] == _strategy) {
                withdrawOrder[i] = address(0);
                strategies[_strategy].activation = 0;
                --activeStrategies;
                _organizeWithdrawOrder();

                emit StrategyRemoved(_strategy);
                return;
            }
        }
    }

    /// @inheritdoc IMultistrategyManageable
    function setStrategyDebtRatio(address _strategy, uint256 _debtRatio) external onlyManager onlyActiveStrategy(_strategy) {
        uint256 newDebtRatio = debtRatio - strategies[_strategy].debtRatio + _debtRatio;
        require(newDebtRatio <= MAX_BPS, Errors.DebtRatioAboveMaximum(newDebtRatio));

        debtRatio = newDebtRatio;
        strategies[_strategy].debtRatio = _debtRatio;

        emit StrategyDebtRatioSet(_strategy, _debtRatio);
    }

    /// @inheritdoc IMultistrategyManageable
    function setStrategyMinDebtDelta(address _strategy, uint256 _minDebtDelta) external 
        onlyManager  
        onlyActiveStrategy(_strategy) 
    {
        require(strategies[_strategy].maxDebtDelta >= _minDebtDelta, Errors.InvalidDebtDelta());

        strategies[_strategy].minDebtDelta = _minDebtDelta;

        emit StrategyMinDebtDeltaSet(_strategy, _minDebtDelta);
    }

    /// @inheritdoc IMultistrategyManageable
    function setStrategyMaxDebtDelta(address _strategy, uint256 _maxDebtDelta) external 
        onlyManager 
        onlyActiveStrategy(_strategy) 
    {
        require(strategies[_strategy].minDebtDelta <= _maxDebtDelta, Errors.InvalidDebtDelta());

        strategies[_strategy].maxDebtDelta = _maxDebtDelta;

        emit StrategyMaxDebtDeltaSet(_strategy, _maxDebtDelta);
    }


    /// @inheritdoc IMultistrategyManageable
    function retire() external onlyGuardian {
        retired = true;
        emit MultistrategyRetired();
    }

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

    /// @notice Validates the order of strategies for withdrawals.
    /// 
    /// This function performs the following actions:
    /// - Ensures the length of the provided strategies array matches the maximum number of strategies.
    /// - Iterates through the provided strategies to validate each one:
    ///   - Checks that non-zero addresses correspond to active strategies.
    ///   - Ensures there are no duplicate strategies in the provided array.
    /// - If an address in the provided array is zero, it checks that all subsequent addresses are also zero.
    /// 
    /// @param _strategies The array of strategy addresses to validate.
    /// @return True if the order is valid. False if not valid.
    function _validateStrategyOrder(address[] memory _strategies) internal view returns (bool) {
        if(_strategies.length != MAXIMUM_STRATEGIES) return false;

        for(uint8 i = 0; i < MAXIMUM_STRATEGIES; ++i) {
            address strategy = _strategies[i];

            if(strategy != address(0)) {
                if(strategies[strategy].activation == 0) return false;
                // Start to check on the next strategy
                for(uint8 j = 0; j < MAXIMUM_STRATEGIES; ++j) {
                    // Check that the strategy isn't duplicate
                    if(i != j && strategy == _strategies[j]) return false;
                }
            } else {
                // Check that the rest of the addresses are address(0)
                for(uint8 j = i + 1; j < MAXIMUM_STRATEGIES; ++j) {
                    if(_strategies[j] != address(0)) return false;
                }
                return true;
            }
        }
        return true;
    }

    /// @notice Organizes the withdraw order by removing gaps and shifting strategies.
    /// 
    /// This function performs the following actions:
    /// - Iterates through the withdraw order array.
    /// - For each strategy, if it encounters an empty slot (address(0)), it shifts subsequent strategies up to fill the gap.
    /// - Ensures that any empty slots are moved to the end of the array.
    function _organizeWithdrawOrder() internal {
        uint8 position = 0;
        for(uint8 i = 0; i < MAXIMUM_STRATEGIES; ++i) {
            address strategy = withdrawOrder[i];
            if(strategy == address(0)) {
                ++position;
            } else if (position > 0) {
                withdrawOrder[i - position] = strategy;
                withdrawOrder[i] = address(0);
            }
        }
    }
}

// SPDX-License-Identifier: GNU AGPLv3

pragma solidity ^0.8.27;

import { IMultistrategyManageable } from "interfaces/infra/multistrategy/IMultistrategyManageable.sol";

interface IMultistrategy is IMultistrategyManageable {
    /// @notice Emitted when an account has made a deposit.
    /// @param amount Amount of asset that has been deposited.
    /// @param recipient Address that will receive the receipt tokens.
    event Deposit(uint256 amount, address indexed recipient);

    /// @notice Emitted when an account has made a withdraw.
    /// @param amount Amount of shares that have been withdrawn.
    event Withdraw(uint256 amount);

    /// @notice Emitted when a strategy has requested a credit.
    /// @param strategy Address of the strategy that requested the credit.
    /// @param amount Amount of credit that has been granted to the strategy.
    event CreditRequested(address indexed strategy, uint256 amount);

    /// @notice Emitted when a strategy has submitted a report.
    /// @param strategy Address of the strategy that has submitted the report.
    /// @param debtRepaid Amount of debt that has been repaid by the strategy.
    /// @param gain Amount of gain that the strategy has reported.
    /// @param loss Amount of loss that the strategy has reported.
    event StrategyReported(address indexed strategy, uint256 debtRepaid, uint256 gain, uint256 loss);

    /// @notice Timestamp of the last report made by a strategy.
    function lastReport() external view returns (uint256);

    /// @notice Amount of tokens that are locked as "locked profit" and can't be withdrawn.
    function lockedProfit() external view returns (uint256);

    /// @notice Rate at which the locked profit gets unlocked per second.
    function lockedProfitDegradation() external view returns (uint256);

    /// @notice Returns the value of a share in `asset` value.
    function pricePerShare() external view returns (uint256);

    /// @notice Returns the amount of tokens a strategy can borrow from this Multistrategy.
    /// @param strategy Address of the strategy we want to know the credit available for.
    function creditAvailable(address strategy) external view returns (uint256);

    /// @notice Returns the excess of debt a strategy currently holds.
    /// @param strategy Address of the strategy we want to know if it has any debt excess.
    function debtExcess(address strategy) external view returns (uint256);

    /// @notice Returns the total debt of `strategy`.
    /// @param strategy Address of the strategy we want to know the `totalDebt`.
    function strategyTotalDebt(address strategy) external view returns (uint256);

    /// @notice Returns the aggregate PnL of all strategies at max slippage.
    function currentPnL() external view returns (uint256, uint256);
    
    /// @notice Send the available credit of the caller to the caller.
    /// @dev Reverts if the caller is *NOT* an active strategy
    function requestCredit() external returns (uint256);

    /// @notice Report the profit or loss of a strategy along any debt the strategy is willing to pay back.
    /// @dev Can only be called by an active strategy.
    /// @param _debtRepayment Amount that the strategy will send back to the multistrategy as debt repayment.
    /// @param _gain Amount that the strategy has realized as a gain since the last report and will send it
    ///                to this Multistrategy as earnings. 
    /// @param _loss Amount that the strategy has realized as a loss since the last report. 
    function strategyReport(uint256 _debtRepayment, uint256 _gain, uint256 _loss) external;

    /// @notice Emergency function to rescue tokens not related to the Multistrategy sent to the contract by mistake.
    /// @param token Address of the token that will be rescued.
    /// @param recipient Address of who will receive the tokens.
    function rescueToken(address token, address recipient) external;
}

// SPDX-License-Identifier: GNU AGPLv3

pragma solidity ^0.8.27;

interface IStrategyAdapter {
    /// @notice Emitted when the slippage limit is set.
    /// @param slippageLimit The new slippage limit in basis points (BPS).
    event SlippageLimitSet(uint256 slippageLimit);

    /// @notice Returns the address of the multistrategy this Strategy belongs to.
    function multistrategy() external view returns (address);

    /// @notice Returns the address of the token used tby this strategy.
    /// @dev it should be the same as the token used by the multistrategy.
    function asset() external view returns (address);

    /// @notice Returns the identifier of this Strategy Adapter.
    function id() external view returns (string memory);

    /// @notice Returns the name of this Strategy Adapter.
    function name() external view returns (string memory);

    /// @notice Returns the current slippage limit in basis points (BPS).
    /// @dev The slippage limit is expressed in BPS, where 10,000 BPS equals 100%.
    /// @return The maximum allowable slippage in basis points.
    function slippageLimit() external view returns (uint256);

    /// @notice Sets the maximum allowable slippage limit for withdrawals.
    /// @dev Slippage limit is expressed in basis points (BPS), where 10,000 BPS equals 100%.
    /// This limit represents the tolerated difference between the expected withdrawal amount
    /// and the actual amount withdrawn from the strategy.
    /// @param _slippageLimit The maximum allowable slippage in basis points.
    function setSlippageLimit(uint256 _slippageLimit) external;

    /// @notice Requests a credit to the multistrategy. The multistrategy will send the
    /// maximum amount of credit available for this strategy.
    function requestCredit() external;

    /// @notice Sends a report to the Multistrategy of any gain or loss this strategy has
    ///         made along an amount to be withdrawn and be used for debt repayment.
    /// @dev Only the owner can call it
    /// @param _amountToWithdraw Amount that will be withdrawn from the strategy and will
    ///         be available for debt repayment.
    function sendReport(uint256 _amountToWithdraw) external;

    /// @notice Sends a report to the Multistrategy of any gain or loss this strategy has made.
    /// @dev This report wont withdraw any funds to repay debt to the Multistrategy.
    /// Only the multistrategy can call it
    function askReport() external;

    /// @notice Sends a report to the Multistrategy after this strategy has been panicked.
    ///         Reporting any gains or loss based on the balance the could be emergency withdrawn
    /// @dev This function should only be called after a strategy has been retired.
    function sendReportPanicked() external;

    /// @notice Withdraws `asset` from the strategy.
    /// @dev Only callable by the multistrategy.
    /// @param _amount Amount of tokens to withdraw from the strategy.
    function withdraw(uint256 _amount) external returns (uint256);

    /// @notice Returns the amount of `asset` this strategy holds.
    function totalAssets() external view returns (uint256);

    /// @notice Returns the gain or loss this strategy has made since the last report.
    /// @dev The returned values will account for max slippage.
    function currentPnL() external view returns (uint256, uint256);

    /// @notice Starts the panic process for this strategy.
    /// The panic process consists of:
    ///     - Withdraw as much funds as possible from the underlying strategy.
    ///     - Report back to the multistrategy with the available funds.
    ///     - Revoke the allowance that this adapter has given to the underlying strategy.
    ///     - Pauses this contract.
    function panic() external;

    /// @notice Pauses the smart contract.
    /// @dev Functions that implement the `paused` modifier will revert when called.
    /// Guardians and Owner can call this function
    function pause() external;

    /// @notice Unpauses the smart contract.
    /// @dev Functions that implement the `paused` won't revert when called.
    /// Only the Owner can call this function
    function unpause() external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.20;

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

    /// @notice Thrown when `msg.sender` is not the manager.
    error CallerNotManager(address caller);

    /// @notice Thrown when `msg.sender` is not a guardian.
    error CallerNotGuardian(address caller);

    /// @notice Thrown when `amount` is zero.
    error ZeroAmount(uint256 amount);

    /// @notice Thrown when setting an address to the zero address.
    error ZeroAddress();

    /// @notice Thrown when `currentBalance` is lower than `amount`.
    error InsufficientBalance(uint256 currentBalance, uint256 amount);

    /// @notice Thrown when `addr` is an unexpected address.
    error InvalidAddress(address addr);

    /*//////////////////////////////////////////////////////////////////////////
                                    MULTISTRATEGY
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when performing an action on a non-active strategy.
    error StrategyNotActive(address strategy);

    /// @notice Thrown when performing an action on an active strategy.
    error StrategyAlreadyActive(address strategy);

    /// @notice Thrown when a strategy is reporting a gain and a loss simultaneously.
    error GainLossMismatch();

    /// @notice Thrown when a deposit would exceed the depositLimit
    error DepositLimit();

    /// @notice Thrown when the owner tries to set a fee above the maximum permitted fee.
    error ExcessiveFee(uint256 fee);

    /// @notice Thrown when the debtRatio of a strategy or a multistrategy is above 100%.
    error DebtRatioAboveMaximum(uint256 debtRatio);

    /// @notice Thrown when trying to remove a strategy from `withdrawOrder` that still has outstanding debt.
    error StrategyWithOutstandingDebt();

    /// @notice Thrown when minDebtDelta is above maxDebtDelta or maxDebtDelta is below minDebtDelta.
    error InvalidDebtDelta();

    /// @notice Thrown when a strategy is reporting a loss higher than its total debt.
    error InvalidStrategyLoss();

    /// @notice Thrown when there is non-Zero Address following a Zero Address in withdrawOrder.
    error InvalidWithdrawOrder();

    /// @notice Thrown when trying to add a new strategy to the multistrategy but it already reached the
    /// maximum amount of strategies.
    error MaximumAmountStrategies();

    /// @notice Thrown when trying to remove a strategy that has a `debtRatio` greater than 0.
    error StrategyNotRetired();

    /// @notice Thrown when there isn't enough liquidity to cover a withdraw
    /// @param assets The amount of assets requested.
    /// @param liquidity The current liquidity available in the contract.
    error InsufficientLiquidity(uint256 assets, uint256 liquidity);

    /// @notice Thrown when depositing / minting on a retired multistrategy.
    error Retired();

    /*//////////////////////////////////////////////////////////////////////////
                                STRATEGY ADAPTER
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Thrown when the caller is not the Multistrategy.
    error CallerNotMultistrategy(address caller);

    /// @notice Thrown when the `_asset` parameter on the constructor doesn't match 
    /// the `deposit` token on Multistrategy.
    error AssetMismatch(address multAsset, address stratAsset);

    /// @notice Thrown when the requested slippage limit exceeds the maximum permitted value.
    /// @param slippageLimit The slippage limit in basis points (BPS).
    error SlippageLimitExceeded(uint256 slippageLimit);

    /// @notice Thrown when the actual slippage exceeds the allowed slippage.
    /// @param amount0 The expected amount after accounting for allowed slippage.
    /// @param amount1 The actual amount obtained.
    error SlippageCheckFailed(uint256 amount0, uint256 amount1);

    /// @notice Thrown when the reward added is the base asset of the Strategy.
    error InvalidRewardToken(address rewardToken);

    /*//////////////////////////////////////////////////////////////////////////
                                    ERC-4626
    //////////////////////////////////////////////////////////////////////////*/

    /**
     * @dev Attempted to deposit more assets than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxDeposit(address receiver, uint256 assets, uint256 max);

    /**
     * @dev Attempted to mint more shares than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxMint(address receiver, uint256 shares, uint256 max);

    /**
     * @dev Attempted to withdraw more assets than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxWithdraw(address owner, uint256 assets, uint256 max);

    /**
     * @dev Attempted to redeem more shares than the max amount for `receiver`.
     */
    error ERC4626ExceededMaxRedeem(address owner, uint256 shares, uint256 max);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.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}.
 *
 * 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.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => 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 returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual 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 `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` 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 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        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 `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` 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.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` 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.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC4626.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../token/ERC20/IERC20.sol";
import {IERC20Metadata} from "../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].
 */
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: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @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 v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

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

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

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) 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 FailedInnerCall();
        }
    }
}

// SPDX-License-Identifier: GNU AGPLv3

pragma solidity 0.8.27;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { Pausable } from "@openzeppelin/contracts/utils/Pausable.sol";
import { IMultistrategyAdminable } from "interfaces/infra/multistrategy/IMultistrategyAdminable.sol";
import { Errors } from "src/infra/libraries/Errors.sol";

abstract contract MultistrategyAdminable is IMultistrategyAdminable, Ownable, Pausable {
    /*//////////////////////////////////////////////////////////////////////////
                                       STORAGE
    //////////////////////////////////////////////////////////////////////////*/

    /// @inheritdoc IMultistrategyAdminable
    address public manager;

    /// @inheritdoc IMultistrategyAdminable
    mapping(address guardianAddress => bool isActive) public guardians;

    /// @notice Sets the Owner and Manager addresses.
    /// @param _owner The address of the initial owner.
    /// @param _manager The address of the initial manager.
    constructor(address _owner, address _manager) Ownable(_owner) {
        manager = _manager;
    }

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

    /// @notice Reverts if called by any account other than the owner or the manager.
    modifier onlyManager() {
        require(
            msg.sender == owner() || 
            msg.sender == manager, 
            Errors.CallerNotManager(msg.sender)
        );
        _;
    }

    /// @notice Reverts if called by any account other than the owner, the manager, or a guardian.
    modifier onlyGuardian() {
        require(
            msg.sender == owner() || 
            msg.sender == manager || 
            guardians[msg.sender], 
            Errors.CallerNotGuardian(msg.sender)
        );
        _;
    }

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

    /// @inheritdoc IMultistrategyAdminable
    function setManager(address _manager) external onlyOwner {
        require(_manager != address(0), Errors.ZeroAddress());

        manager = _manager;
        emit ManagerSet(_manager);
    }

    /// @inheritdoc IMultistrategyAdminable
    function enableGuardian(address _guardian) external onlyOwner {
        guardians[_guardian] = true;
        emit GuardianEnabled(_guardian);
    }

    /// @inheritdoc IMultistrategyAdminable
    function revokeGuardian(address _guardian) external onlyOwner {
        guardians[_guardian] = false;
        emit GuardianRevoked(_guardian);
    }

    /// @inheritdoc IMultistrategyAdminable
    function pause() external onlyGuardian {
        _pause();
    }

    /// @inheritdoc IMultistrategyAdminable
    function unpause() external onlyOwner {
        _unpause();
    }
}

// SPDX-License-Identifier: GNU AGPLv3

pragma solidity ^0.8.27;

import { IMultistrategyAdminable } from "interfaces/infra/multistrategy/IMultistrategyAdminable.sol";
import { MStrat } from "src/types/DataTypes.sol";

interface IMultistrategyManageable is IMultistrategyAdminable {
    /// @notice Emitted when the protocol fee recipient is set.
    /// @param _protocolFeeRecipient The address that will receive the protocol fee.
    event ProtocolFeeRecipientSet(address indexed _protocolFeeRecipient);

    /// @notice Emitted when the performance fee is set.
    /// @param _performanceFee The new performance fee value.
    event PerformanceFeeSet(uint256 _performanceFee);

    /// @notice Emitted when the deposit limit is set.
    /// @param _depositLimit The new deposit limit value.
    event DepositLimitSet(uint256 _depositLimit);

    /// @notice Emitted when the slippage limit is set.
    /// @param _slippageLimit The new slippage limit value.
    event SlippageLimitSet(uint256 _slippageLimit);

    /// @notice Emitted when a new withdrawal order has been set.
    event WithdrawOrderSet();

    /// @notice Emitted when the debt ratio for a specific strategy is set.
    /// @param _strategy The address of the strategy whose debt ratio was updated.
    /// @param _debtRatio The new debt ratio value for the specified strategy.
    event StrategyDebtRatioSet(address indexed _strategy, uint256 _debtRatio);

    /// @notice Emitted when the minimum debt delta for a specific strategy is set.
    /// @param _strategy The address of the strategy whose minimum debt delta was updated.
    /// @param _minDebtDelta The new minimum debt delta value for the specified strategy.
    event StrategyMinDebtDeltaSet(address indexed _strategy, uint256 _minDebtDelta);

    /// @notice Emitted when the maximum debt delta for a specific strategy is set.
    /// @param _strategy The address of the strategy whose maximum debt delta was updated.
    /// @param _maxDebtDelta The new maximum debt delta value for the specified strategy.
    event StrategyMaxDebtDeltaSet(address indexed _strategy, uint256 _maxDebtDelta);

    /// @notice Emitted when a new strategy is added.
    /// @param _strategy The address of the newly added strategy.
    event StrategyAdded(address indexed _strategy);

    /// @notice Emitted when a strategy is retired.
    /// @param _strategy The address of the retired strategy.
    event StrategyRetired(address indexed _strategy);

    /// @notice Emitted when a strategy is removed.
    /// @param _strategy The address of the removed strategy.
    event StrategyRemoved(address indexed _strategy);

    /// @notice Emitted when the deposits into this multistrategy are paused.
    event MultistrategyRetired();

    /// @notice Address that will receive performance fee.
    function protocolFeeRecipient() external view returns (address);

    /// @notice Fee on the yield generated (in BPS).
    /// @dev Performance fee is taken on `strategyReport()` function on the Multistrategy contract.
    function performanceFee() external view returns (uint256);

    /// @notice Limit for total assets the multistrategy can hold.
    function depositLimit() external view returns (uint256);

    /// @notice Debt ratio of the multistrategy across all strategies (in BPS).
    /// @dev The debt ratio cannot exceed 10_000 BPS (100 %).
    function debtRatio() external view returns (uint256);

    /// @notice Amount of tokens that the strategies have borrowed in total.
    function totalDebt() external view returns (uint256);

    /// @notice Returns the current slippage limit in basis points (BPS).
    /// @dev The slippage limit is expressed in BPS, where 10,000 BPS equals 100%.
    function slippageLimit() external view returns (uint256);

    /// @notice Amount of active strategies.
    function activeStrategies() external view returns (uint8);

    /// @notice Returns true if multistrategy has been retired. 
    function retired() external view returns (bool);

    /// @notice Returns the withdraw order.
    function getWithdrawOrder() external view returns (address[] memory);

    /// @notice Returns the strategy params of `strategy`
    /// @param _strategy Address of the strategy the it will returns the parameters of.
    function getStrategyParameters(address _strategy) external view returns (MStrat.StrategyParams calldata);

    /// @notice Sets the recipient address of the performance fee.
    /// @dev Emits a `SetProtocolFeeRecipient` event.
    /// @param _protocolFeeRecipient Address that will receive the fees.
    function setProtocolFeeRecipient(address _protocolFeeRecipient) external;

    /// @notice Sets the performance fee in BPS.
    /// @dev Reverts if `performanceFee` is above MAX_PERFORMANCE_FEE
    /// @dev Emits a `SetPerformanceFee` event.
    /// @param _performanceFee New performance fee.
    function setPerformanceFee(uint256 _performanceFee) external;

    /// @notice Sets the deposit limit.
    /// @dev Emits a `SetDepositLimit` event.
    /// @param _depositLimit New deposit limit.
    function setDepositLimit(uint256 _depositLimit) external;

    /// @notice Sets the slippage limit of this Multistrategy.
    /// @dev The slippage limit is expressed in BPS, where 10,000 BPS equals 100%.
    /// @param _slippageLimit New slippage limit.
    function setSlippageLimit(uint256 _slippageLimit) external;

    /// @notice Sets the withdraw order. First position in the array will be the first strategy that it will get the funds withdrawn
    /// @dev It will revert if a strategy in the array is not active or if the array contains duplicate addresses.
    /// @param _strategies Array of strategy addresses
    function setWithdrawOrder(address[] memory _strategies) external;

    /// @notice Adds a strategy to the multistrategy.
    /// @dev The strategy will be appended to `withdrawOrder`.
    /// @param _strategy The address of the strategy.
    /// @param _debtRatio The share of total assets in the Multistrategy this strategy will have access to.
    /// @param _minDebtDelta Lower limit on the increase of debt.
    /// @param _maxDebtDelta Upper limit on the increase of debt.
    function addStrategy(
        address _strategy,
        uint256 _debtRatio,
        uint256 _minDebtDelta,
        uint256 _maxDebtDelta
    ) external;

    /// @notice Sets the strategy debtRatio to 0, which prevents any further deposits into the strategy.
    /// @dev Retiring a strategy will set the approval of `asset` to the retired strategy to 0.
    /// @param _strategy The address of the strategy that will be retired.
    function retireStrategy(address _strategy) external;

    /// @notice Removes a strategy from `withdrawOrder`.
    /// @param _strategy The address of the strategy that will be removed.
    function removeStrategy(address _strategy) external;

    /// @notice Change the debt ratio of a strategy.
    /// @param _strategy Address of the strategy.
    /// @param _debtRatio New debt ratio.
    function setStrategyDebtRatio(address _strategy, uint256 _debtRatio) external;

    /// @notice Change the minimum amount of debt a strategy can take.
    /// @dev Used to limit the minimum amount of debt a strategy should take. 
    ///      Taking a small credit wouldn't be optimal gas-wise.
    /// @param _strategy Address of the strategy.
    /// @param _minDebtDelta Lower limit of the change of debt.
    function setStrategyMinDebtDelta(address _strategy, uint256 _minDebtDelta) external;

    /// @notice Change the maximum amount of debt a strategy can take at once.
    /// @dev Used to protect large debt repayments or withdraws. Risks are IL, or low liquidity.
    /// @param _strategy Address of the strategy.
    /// @param _maxDebtDelta Upper limit of the change of debt.
    function setStrategyMaxDebtDelta(address _strategy, uint256 _maxDebtDelta) external;

    /// @notice Retires the Multistrategy. End of Life.
    function retire() external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.20;

/// @notice Namespace for the structs used in `Multistrategy`
library MStrat {
    /// @notice Struct that contains a strategy data
    /// @param activation Block.timestamp of when the strategy was activated. 0 means not active
    /// @param debtRatio Maximum amount the strategy can borrow from the Multistrategy (in BPS of total assets in a Multistrategy)
    /// @param lastReport 
    /// @param minDebtDelta Lower limit on the increase or decrease of debt since last harvest
    /// @param maxDebtDelta Upper limit on the increase or decrease of debt since last harvest
    /// @param totalDebt Total debt that this strategy has
    /// @param totalGain Total gains that this strategy has realized
    /// @param totalLoss Total losses that this strategy has realized
    struct StrategyParams {
        uint256 activation;
        uint256 debtRatio;
        uint256 lastReport;
        uint256 minDebtDelta;
        uint256 maxDebtDelta;
        uint256 totalDebt;
        uint256 totalGain;
        uint256 totalLoss;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

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

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: GNU AGPLv3

pragma solidity ^0.8.27;

/// @title IMultistrategyAdminable
/// @notice Contract module that provides a 3 level access control mechanism, with an owner, a manager
/// and a list of guardians that can be granted exclusive access to specific functions.
/// The inheriting contract must set the initial owner and the initial manager in the constructor.
interface IMultistrategyAdminable {
    /*//////////////////////////////////////////////////////////////////////////
                                       EVENTS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Emitted when a new manager is set.
    /// @param _manager The address of the new manager.
    event ManagerSet(address indexed _manager);

    /// @notice Emitted when a new guardian has been granted access.
    /// @param _guardian The address of the guardian.
    event GuardianEnabled(address indexed _guardian);

    /// @notice Emitted when a the access of a guardian has been revoked.
    /// @param _guardian The address of the guardian.
    event GuardianRevoked(address indexed _guardian);

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

    /// @notice The address of the manager.
    function manager() external view returns (address);

    /// @notice List of addresses enabled as guardian.
    /// @param _guardian The address to check if it is a guardian.
    function guardians(address _guardian) external view returns (bool);
    
    /*//////////////////////////////////////////////////////////////////////////
                               NON-CONSTANT FUNCTIONS
    //////////////////////////////////////////////////////////////////////////*/

    /// @notice Sets the manager address.
    /// @dev Doesn't revert if:
    /// - manager address is zero address.
    /// - manager address is the same as previous manager address.
    /// @param _manager Address of the new manager.
    function setManager(address _manager) external;

    /// @notice Enables an address to be a guardian.
    /// @dev Doesn't revert if:
    /// - guardian address is zero address.
    /// - guardian address is already enabled as guardian.
    /// @param _guardian The address of the guardian.
    function enableGuardian(address _guardian) external;

    /// @notice Revokes an address to be a guardian.
    /// @dev Doesn't revert if:
    /// - guardian address is zero address.
    /// - guardian address is already revoked.
    /// @param _guardian The address of the guardian.
    function revokeGuardian(address _guardian) external;

    /// @notice Pauses the smart contract.
    /// @dev Functions that implement the `paused` modifier will revert when called.
    /// Guardians, Manager and Owner can call this function
    function pause() external;

    /// @notice Unpauses the smart contract.
    /// @dev Functions that implement the `paused` won't revert when called.
    /// Guardians, Manager and Owner can call this function
    function unpause() external;
}

{
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    "src/=src/",
    "interfaces/=src/interfaces/",
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    "@openzeppelin/contracts/=lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/contracts/",
    "@openzeppelin-4/contracts/=lib/openzeppelin-contracts-4/contracts/",
    "@layerzero/=lib/solidity-examples/contracts/",
    "@aave/=lib/aave-v3-origin/src/",
    "@xerc20/=lib/xERC20/",
    "@uniswap/v3-periphery/=lib/v3-periphery/",
    "@uniswap/v3-core/=lib/v3-core/",
    "@addressbook/=lib/goat-address-book/src/sol/",
    "@trust-security/trustlessPermit/=lib/trustlessPermit/",
    "@uniswapV3-periphery/=lib/v3-periphery/contracts/",
    "@prb/math/=lib/prb-math/",
    "@properties/=lib/properties/",
    "@prb/test/=lib/prb-math/node_modules/@prb/test/",
    "ERC4626/=lib/properties/lib/ERC4626/contracts/",
    "aave-v3-core/=lib/aave-v3-origin/src/core/",
    "aave-v3-origin/=lib/aave-v3-origin/",
    "aave-v3-periphery/=lib/aave-v3-origin/src/periphery/",
    "common/=lib/common/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/erc4626-tests/",
    "goat-address-book/=lib/goat-address-book/",
    "openzeppelin-contracts-4/=lib/openzeppelin-contracts-4/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin-foundry-upgrades/=lib/openzeppelin-foundry-upgrades/src/",
    "openzeppelin/=lib/openzeppelin-contracts-4/contracts/",
    "prb-math/=lib/prb-math/src/",
    "properties/=lib/properties/contracts/",
    "solidity-examples/=lib/solidity-examples/contracts/",
    "solidity-stringutils/=lib/openzeppelin-foundry-upgrades/lib/solidity-stringutils/",
    "solidity-utils/=lib/aave-v3-origin/lib/solidity-utils/",
    "solmate/=lib/solmate/src/",
    "trustlessPermit/=lib/trustlessPermit/",
    "v3-core/=lib/v3-core/",
    "v3-periphery/=lib/v3-periphery/contracts/",
    "xERC20/=lib/xERC20/"
  ],
  "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,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : _asset (address): 0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8
Arg [1] : _manager (address): 0x75cb5d555933fe86E0ac8975A623aCb5CEC13E28
Arg [2] : _protocolFeeRecipient (address): 0x5BE13f90cD86a8bb0f0573B550f04b95927F5dc5
Arg [3] : _name (string): Yield Chasing Silo USDC
Arg [4] : _symbol (string): ycsUSDC

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 000000000000000000000000ff970a61a04b1ca14834a43f5de4533ebddb5cc8
Arg [1] : 00000000000000000000000075cb5d555933fe86e0ac8975a623acb5cec13e28
Arg [2] : 0000000000000000000000005be13f90cd86a8bb0f0573b550f04b95927f5dc5
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [4] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000017
Arg [6] : 5969656c642043686173696e672053696c6f2055534443000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [8] : 7963735553444300000000000000000000000000000000000000000000000000