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// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../dependencies/openzeppelin/contracts/proxy/utils/Initializable.sol";
import "../dependencies/openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../dependencies/openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./PoolERC20Permit.sol";
import "./PoolStorage.sol";
import "../Errors.sol";
import "../Governable.sol";
import "../Pausable.sol";
import "../interfaces/vesper/IPoolAccountant.sol";
import "../interfaces/vesper/IPoolRewards.sol";
import "vesper-commons/contracts/interfaces/vesper/IStrategy.sol";

/// @title Holding pool share token
// solhint-disable no-empty-blocks
contract VPool is Initializable, PoolERC20Permit, Governable, Pausable, ReentrancyGuard, PoolStorageV3 {
    using SafeERC20 for IERC20;
    using EnumerableSet for EnumerableSet.AddressSet;

    string public constant VERSION = "5.0.2";

    uint256 public constant MAX_BPS = 10_000;
    // For simplicity we are assuming 365 days as 1 year
    uint256 public constant ONE_YEAR = 365 days;

    event UpdatedMaximumProfitAsFee(uint256 oldMaxProfitAsFee, uint256 newMaxProfitAsFee);
    event UpdatedMinimumDepositLimit(uint256 oldDepositLimit, uint256 newDepositLimit);
    event Deposit(address indexed owner, uint256 shares, uint256 amount);
    event Withdraw(address indexed owner, uint256 shares, uint256 amount);
    event UpdatedUniversalFee(uint256 oldUniversalFee, uint256 newUniversalFee);
    event UpdatedPoolRewards(address indexed previousPoolRewards, address indexed newPoolRewards);
    event UpdatedWithdrawFee(uint256 previousWithdrawFee, uint256 newWithdrawFee);
    event UniversalFeePaid(uint256 strategyDebt, uint256 profit, uint256 fee);

    // We are using constructor to initialize implementation with basic details
    constructor(
        string memory _name,
        string memory _symbol,
        address _token
    ) PoolERC20(_name, _symbol) {
        // 0x0 is acceptable as has no effect on functionality
        token = IERC20(_token);
    }

    /// @dev Equivalent to constructor for proxy. It can be called only once per proxy.
    function initialize(
        string memory _name,
        string memory _symbol,
        address _token,
        address _poolAccountant
    ) public initializer {
        require(_token != address(0), Errors.INPUT_ADDRESS_IS_ZERO);
        require(_poolAccountant != address(0), Errors.INPUT_ADDRESS_IS_ZERO);
        __ERC20_init(_name, _symbol);
        __ERC20Permit_init(_name);
        __Governable_init();
        token = IERC20(_token);

        require(_keepers.add(_msgSender()), Errors.ADD_IN_LIST_FAILED);
        require(_maintainers.add(_msgSender()), Errors.ADD_IN_LIST_FAILED);
        poolAccountant = _poolAccountant;
        universalFee = 200; // 2%
        maxProfitAsFee = 5_000; // 50%
        minDepositLimit = 1;
    }

    modifier onlyKeeper() {
        require(governor == _msgSender() || _keepers.contains(_msgSender()), "not-a-keeper");
        _;
    }

    modifier onlyMaintainer() {
        require(governor == _msgSender() || _maintainers.contains(_msgSender()), "not-a-maintainer");
        _;
    }

    /**
     * @notice Deposit ERC20 tokens and receive pool shares depending on the current share price.
     * @param _amount ERC20 token amount.
     */
    function deposit(uint256 _amount) external nonReentrant whenNotPaused {
        _updateRewards(_msgSender());
        _deposit(_amount);
    }

    /**
     * @notice Deposit ERC20 tokens and claim rewards if any
     * @param _amount ERC20 token amount.
     */
    function depositAndClaim(uint256 _amount) external nonReentrant whenNotPaused {
        _depositAndClaim(_amount);
    }

    /**
     * @notice Deposit ERC20 tokens with permit aka gasless approval.
     * @param _amount ERC20 token amount.
     * @param _deadline The time at which signature will expire
     * @param _v The recovery byte of the signature
     * @param _r Half of the ECDSA signature pair
     * @param _s Half of the ECDSA signature pair
     */
    function depositWithPermit(
        uint256 _amount,
        uint256 _deadline,
        uint8 _v,
        bytes32 _r,
        bytes32 _s
    ) external nonReentrant whenNotPaused {
        IERC20Permit(address(token)).permit(_msgSender(), address(this), _amount, _deadline, _v, _r, _s);
        _updateRewards(_msgSender());
        _deposit(_amount);
    }

    /**
     * @notice Withdraw collateral based on given shares and the current share price.
     * Burn remaining shares and return collateral. Claim rewards if there is any
     * @dev Deprecated method. Keeping this method here for backward compatibility.
     * @param _shares Pool shares. It will be in 18 decimals.
     */
    function whitelistedWithdraw(uint256 _shares) external nonReentrant whenNotShutdown {
        _claimRewards(_msgSender());
        _withdraw(_shares);
    }

    /**
     * @notice Withdraw collateral based on given shares and the current share price.
     * Burn remaining shares and return collateral.
     * @param _shares Pool shares. It will be in 18 decimals.
     */
    function withdraw(uint256 _shares) external nonReentrant whenNotShutdown {
        _updateRewards(_msgSender());
        _withdraw(_shares);
    }

    /**
     * @notice Withdraw collateral and claim rewards if any
     * @param _shares Pool shares. It will be in 18 decimals.
     */
    function withdrawAndClaim(uint256 _shares) external nonReentrant whenNotShutdown {
        _withdrawAndClaim(_shares);
    }

    /**
     * @notice Transfer tokens to multiple recipient
     * @dev Address array and amount array are 1:1 and are in order.
     * @param _recipients array of recipient addresses
     * @param _amounts array of token amounts
     * @return true/false
     */
    function multiTransfer(address[] calldata _recipients, uint256[] calldata _amounts) external returns (bool) {
        require(_recipients.length == _amounts.length, Errors.INPUT_LENGTH_MISMATCH);
        for (uint256 i = 0; i < _recipients.length; i++) {
            require(transfer(_recipients[i], _amounts[i]), Errors.MULTI_TRANSFER_FAILED);
        }
        return true;
    }

    /**
     * @notice Strategy call this in regular interval. Only strategy function.
     * @param _profit yield generated by strategy. Strategy get performance fee on this amount
     * @param _loss  Reduce debt ,also reduce debtRatio, increase loss in record.
     * @param _payback strategy willing to payback outstanding above debtLimit. no performance fee on this amount.
     *  when governance has reduced debtRatio of strategy, strategy will report profit and payback amount separately.
     */
    function reportEarning(
        uint256 _profit,
        uint256 _loss,
        uint256 _payback
    ) external {
        address _strategy = _msgSender();
        // Calculate universal fee
        if (_profit > 0) {
            (, , , uint256 _lastRebalanceAt, uint256 _totalDebt, , , , ) =
                IPoolAccountant(poolAccountant).strategy(_strategy);
            uint256 _fee = _calculateUniversalFee(_lastRebalanceAt, _totalDebt, _profit);
            // Mint shares equal to universal fee
            if (_fee > 0) {
                _mint(IStrategy(_strategy).feeCollector(), _calculateShares(_fee));
                emit UniversalFeePaid(_totalDebt, _profit, _fee);
            }
        }

        // Report earning in pool accountant
        (uint256 _actualPayback, uint256 _creditLine) =
            IPoolAccountant(poolAccountant).reportEarning(_strategy, _profit, _loss, _payback);
        uint256 _totalPayback = _profit + _actualPayback;
        // After payback, if strategy has credit line available then send more fund to strategy
        // If payback is more than available credit line then get fund from strategy
        if (_totalPayback < _creditLine) {
            token.safeTransfer(_strategy, _creditLine - _totalPayback);
        } else if (_totalPayback > _creditLine) {
            token.safeTransferFrom(_strategy, address(this), _totalPayback - _creditLine);
        }
    }

    /**
     * @notice Report loss outside of rebalance activity.
     * @dev Some strategies pay deposit fee thus realizing loss at deposit.
     * For example: Curve's 3pool has some slippage due to deposit of one asset in 3pool.
     * Strategy may want report this loss instead of waiting for next rebalance.
     * @param _loss Loss that strategy want to report
     */
    function reportLoss(uint256 _loss) external {
        if (_loss > 0) {
            IPoolAccountant(poolAccountant).reportLoss(_msgSender(), _loss);
        }
    }

    /**
     * @dev Transfer given ERC20 token to governor
     * @param _fromToken Token address to sweep
     */
    function sweepERC20(address _fromToken) external onlyKeeper {
        require(_fromToken != address(token), Errors.NOT_ALLOWED_TO_SWEEP);
        IERC20(_fromToken).safeTransfer(governor, IERC20(_fromToken).balanceOf(address(this)));
    }

    /**
     * @notice Get available credit limit of strategy. This is the amount strategy can borrow from pool
     * @dev Available credit limit is calculated based on current debt of pool and strategy, current debt limit of pool and strategy.
     * credit available = min(pool's debt limit, strategy's debt limit, max debt per rebalance)
     * when some strategy do not pay back outstanding debt, this impact credit line of other strategy if totalDebt of pool >= debtLimit of pool
     * @param _strategy Strategy address
     */
    function availableCreditLimit(address _strategy) external view returns (uint256) {
        return IPoolAccountant(poolAccountant).availableCreditLimit(_strategy);
    }

    /**
     * @notice Calculate universal fee for calling strategy. This is only strategy function.
     * @dev Earn strategies will call this during rebalance.
     */
    function calculateUniversalFee(uint256 _profit) external view returns (uint256 _fee) {
        return _calculateUniversalFee(_msgSender(), _profit);
    }

    /**
     * @notice Debt above current debt limit
     * @param _strategy Address of strategy
     */
    function excessDebt(address _strategy) external view returns (uint256) {
        return IPoolAccountant(poolAccountant).excessDebt(_strategy);
    }

    function getStrategies() external view returns (address[] memory) {
        return IPoolAccountant(poolAccountant).getStrategies();
    }

    /// @notice Get total debt of pool
    function totalDebt() external view returns (uint256) {
        return IPoolAccountant(poolAccountant).totalDebt();
    }

    /**
     * @notice Get total debt of given strategy
     * @param _strategy Strategy address
     */
    function totalDebtOf(address _strategy) external view returns (uint256) {
        return IPoolAccountant(poolAccountant).totalDebtOf(_strategy);
    }

    /// @notice Get total debt ratio. Total debt ratio helps us keep buffer in pool
    function totalDebtRatio() external view returns (uint256) {
        return IPoolAccountant(poolAccountant).totalDebtRatio();
    }

    /**
     * @notice Calculate how much shares user will get for given amount. Also return externalDepositFee if any.
     * @param _amount Collateral amount
     * @return _shares Amount of share that user will get
     * @dev Amount should be >= minimum deposit limit which default to 1
     */
    function calculateMintage(uint256 _amount) public view returns (uint256 _shares) {
        require(_amount >= minDepositLimit, Errors.INVALID_COLLATERAL_AMOUNT);
        uint256 _externalDepositFee = (_amount * IPoolAccountant(poolAccountant).externalDepositFee()) / MAX_BPS;
        _shares = _calculateShares(_amount - _externalDepositFee);
    }

    function getWithdrawQueue() public view returns (address[] memory) {
        return IPoolAccountant(poolAccountant).getWithdrawQueue();
    }

    /**
     * @notice Get price per share
     * @dev Return value will be in token defined decimals.
     */
    function pricePerShare() public view returns (uint256) {
        if (totalSupply() == 0 || totalValue() == 0) {
            return 10**IERC20Metadata(address(token)).decimals();
        }
        return (totalValue() * 1e18) / totalSupply();
    }

    function strategy(address _strategy)
        public
        view
        returns (
            bool _active,
            uint256 _interestFee, // Obsolete
            uint256 _debtRate, // Obsolete
            uint256 _lastRebalance,
            uint256 _totalDebt,
            uint256 _totalLoss,
            uint256 _totalProfit,
            uint256 _debtRatio,
            uint256 _externalDepositFee
        )
    {
        return IPoolAccountant(poolAccountant).strategy(_strategy);
    }

    /// @dev Returns the token stored in the pool. It will be in token defined decimals.
    function tokensHere() public view returns (uint256) {
        return token.balanceOf(address(this));
    }

    /**
     * @notice Returns sum of token locked in other contracts and token stored in the pool.
     * It will be in token defined decimals.
     */
    function totalValue() public view returns (uint256) {
        return IPoolAccountant(poolAccountant).totalDebt() + tokensHere();
    }

    /**
     * @dev Hook that is called just after burning tokens.
     * @param _amount Collateral amount in collateral token defined decimals.
     */
    function _afterBurning(uint256 _amount) internal virtual returns (uint256) {
        token.safeTransfer(_msgSender(), _amount);
        return _amount;
    }

    /// @notice claim rewards of account
    function _claimRewards(address _account) internal {
        if (poolRewards != address(0)) {
            IPoolRewards(poolRewards).claimReward(_account);
        }
    }

    /// @dev Deposit incoming token and mint pool token i.e. shares.
    function _deposit(uint256 _amount) internal {
        uint256 _shares = calculateMintage(_amount);
        token.safeTransferFrom(_msgSender(), address(this), _amount);
        _mint(_msgSender(), _shares);
        emit Deposit(_msgSender(), _shares, _amount);
    }

    /// @dev Deposit token and claim rewards if any
    function _depositAndClaim(uint256 _amount) internal {
        _claimRewards(_msgSender());
        _deposit(_amount);
    }

    /// @dev Update pool rewards of sender and receiver during transfer.
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override {
        if (poolRewards != address(0)) {
            IPoolRewards(poolRewards).updateReward(sender);
            IPoolRewards(poolRewards).updateReward(recipient);
        }
        super._transfer(sender, recipient, amount);
    }

    function _updateRewards(address _account) internal {
        if (poolRewards != address(0)) {
            IPoolRewards(poolRewards).updateReward(_account);
        }
    }

    /// @dev Burns shares and returns the collateral value, after fee, of those.
    function _withdraw(uint256 _shares) internal {
        require(_shares > 0, Errors.INVALID_SHARE_AMOUNT);

        (uint256 _amountWithdrawn, bool _isPartial) = _beforeBurning(_shares);
        // There may be scenarios when pool is not able to withdraw all of requested amount
        if (_isPartial) {
            // Recalculate proportional share on actual amount withdrawn
            uint256 _proportionalShares = _calculateShares(_amountWithdrawn);
            if (_proportionalShares < _shares) {
                _shares = _proportionalShares;
            }
        }
        _burn(_msgSender(), _shares);
        _afterBurning(_amountWithdrawn);
        emit Withdraw(_msgSender(), _shares, _amountWithdrawn);
    }

    /// @dev Withdraw collateral and claim rewards if any
    function _withdrawAndClaim(uint256 _shares) internal {
        _claimRewards(_msgSender());
        _withdraw(_shares);
    }

    function _withdrawCollateral(uint256 _amount) internal {
        // Withdraw amount from queue
        uint256 _debt;
        uint256 _balanceAfter;
        uint256 _balanceBefore;
        uint256 _amountWithdrawn;
        uint256 _totalAmountWithdrawn;
        address[] memory _withdrawQueue = getWithdrawQueue();
        uint256 _len = _withdrawQueue.length;
        for (uint256 i; i < _len; i++) {
            uint256 _amountNeeded = _amount - _totalAmountWithdrawn;
            address _strategy = _withdrawQueue[i];
            _debt = IPoolAccountant(poolAccountant).totalDebtOf(_strategy);
            if (_debt == 0) {
                continue;
            }
            if (_amountNeeded > _debt) {
                // Should not withdraw more than current debt of strategy.
                _amountNeeded = _debt;
            }
            _balanceBefore = tokensHere();
            //solhint-disable no-empty-blocks
            try IStrategy(_strategy).withdraw(_amountNeeded) {} catch {
                continue;
            }
            _balanceAfter = tokensHere();
            _amountWithdrawn = _balanceAfter - _balanceBefore;
            // Adjusting totalDebt. Assuming that during next reportEarning(), strategy will report loss if amountWithdrawn < _amountNeeded
            IPoolAccountant(poolAccountant).decreaseDebt(_strategy, _amountWithdrawn);
            _totalAmountWithdrawn += _amountWithdrawn;
            if (_totalAmountWithdrawn >= _amount) {
                // withdraw done
                break;
            }
        }
    }

    /**
     * @dev Before burning hook.
     * withdraw amount from strategies
     */
    function _beforeBurning(uint256 _share) private returns (uint256 _actualWithdrawn, bool _isPartial) {
        uint256 _amount = (_share * pricePerShare()) / 1e18;
        uint256 _tokensHere = tokensHere();
        _actualWithdrawn = _amount;
        // Check for partial withdraw scenario
        // If we do not have enough tokens then withdraw whats needed from strategy
        if (_amount > _tokensHere) {
            // Strategy may withdraw partial
            _withdrawCollateral(_amount - _tokensHere);
            _tokensHere = tokensHere();
            if (_amount > _tokensHere) {
                _actualWithdrawn = _tokensHere;
                _isPartial = true;
            }
        }
        require(_actualWithdrawn > 0, Errors.INVALID_COLLATERAL_AMOUNT);
    }

    /**
     * @dev Calculate shares to mint/burn based on the current share price and given amount.
     * @param _amount Collateral amount in collateral token defined decimals.
     * @return share amount in 18 decimal
     */
    function _calculateShares(uint256 _amount) private view returns (uint256) {
        uint256 _share = ((_amount * 1e18) / pricePerShare());
        return _amount > ((_share * pricePerShare()) / 1e18) ? _share + 1 : _share;
    }

    /**
     * @dev Calculate universal fee based on strategy's TVL, profit earned and duration between rebalance and now.
     */
    function _calculateUniversalFee(address _strategy, uint256 _profit) private view returns (uint256 _fee) {
        // Calculate universal fee
        (, , , uint256 _lastRebalance, uint256 _totalDebt, , , , ) =
            IPoolAccountant(poolAccountant).strategy(_strategy);
        return _calculateUniversalFee(_lastRebalance, _totalDebt, _profit);
    }

    function _calculateUniversalFee(
        uint256 _lastRebalance,
        uint256 _totalDebt,
        uint256 _profit
    ) private view returns (uint256 _fee) {
        _fee = (universalFee * (block.timestamp - _lastRebalance) * _totalDebt) / (MAX_BPS * ONE_YEAR);
        uint256 _maxFee = (_profit * maxProfitAsFee) / MAX_BPS;
        if (_fee > _maxFee) {
            _fee = _maxFee;
        }
    }

    ////////////////////////////// Only Governor //////////////////////////////

    /**
     * @notice Migrate existing strategy to new strategy.
     * @dev Migrating strategy aka old and new strategy should be of same type.
     * @param _old Address of strategy being migrated
     * @param _new Address of new strategy
     */
    function migrateStrategy(address _old, address _new) external onlyGovernor {
        require(
            IStrategy(_new).pool() == address(this) && IStrategy(_old).pool() == address(this),
            Errors.INVALID_STRATEGY
        );
        IPoolAccountant(poolAccountant).migrateStrategy(_old, _new);
        IStrategy(_old).migrate(_new);
    }

    /**
     * Only Governor:: Update maximum profit that can be used as universal fee
     * @param _newMaxProfitAsFee New max profit as fee
     */
    function updateMaximumProfitAsFee(uint256 _newMaxProfitAsFee) external onlyGovernor {
        require(_newMaxProfitAsFee != maxProfitAsFee, Errors.SAME_AS_PREVIOUS);
        emit UpdatedMaximumProfitAsFee(maxProfitAsFee, _newMaxProfitAsFee);
        maxProfitAsFee = _newMaxProfitAsFee;
    }

    /**
     * Only Governor:: Update minimum deposit limit
     * @param _newLimit New minimum deposit limit
     */
    function updateMinimumDepositLimit(uint256 _newLimit) external onlyGovernor {
        require(_newLimit > 0, Errors.INVALID_INPUT);
        require(_newLimit != minDepositLimit, Errors.SAME_AS_PREVIOUS);
        emit UpdatedMinimumDepositLimit(minDepositLimit, _newLimit);
        minDepositLimit = _newLimit;
    }

    /**
     * @notice Update universal fee for this pool
     * @dev Format: 1500 = 15% fee, 100 = 1%
     * @param _newUniversalFee new universal fee
     */
    function updateUniversalFee(uint256 _newUniversalFee) external onlyGovernor {
        require(_newUniversalFee <= MAX_BPS, Errors.FEE_LIMIT_REACHED);
        emit UpdatedUniversalFee(universalFee, _newUniversalFee);
        universalFee = _newUniversalFee;
    }

    /**
     * @notice Update pool rewards address for this pool
     * @param _newPoolRewards new pool rewards address
     */
    function updatePoolRewards(address _newPoolRewards) external onlyGovernor {
        require(_newPoolRewards != address(0), Errors.INPUT_ADDRESS_IS_ZERO);
        emit UpdatedPoolRewards(poolRewards, _newPoolRewards);
        poolRewards = _newPoolRewards;
    }

    ///////////////////////////// Only Keeper ///////////////////////////////
    function pause() external onlyKeeper {
        _pause();
    }

    function unpause() external onlyKeeper {
        _unpause();
    }

    function shutdown() external onlyKeeper {
        _shutdown();
    }

    function open() external onlyKeeper {
        _open();
    }

    /// @notice Return list of keepers
    function keepers() external view returns (address[] memory) {
        return _keepers.values();
    }

    function isKeeper(address _address) external view returns (bool) {
        return _keepers.contains(_address);
    }

    /**
     * @notice Add given address in keepers list.
     * @param _keeperAddress keeper address to add.
     */
    function addKeeper(address _keeperAddress) external onlyKeeper {
        require(_keepers.add(_keeperAddress), Errors.ADD_IN_LIST_FAILED);
    }

    /**
     * @notice Remove given address from keepers list.
     * @param _keeperAddress keeper address to remove.
     */
    function removeKeeper(address _keeperAddress) external onlyKeeper {
        require(_keepers.remove(_keeperAddress), Errors.REMOVE_FROM_LIST_FAILED);
    }

    /// @notice Return list of maintainers
    function maintainers() external view returns (address[] memory) {
        return _maintainers.values();
    }

    function isMaintainer(address _address) external view returns (bool) {
        return _maintainers.contains(_address);
    }

    /**
     * @notice Add given address in maintainers list.
     * @param _maintainerAddress maintainer address to add.
     */
    function addMaintainer(address _maintainerAddress) external onlyKeeper {
        require(_maintainers.add(_maintainerAddress), Errors.ADD_IN_LIST_FAILED);
    }

    /**
     * @notice Remove given address from maintainers list.
     * @param _maintainerAddress maintainer address to remove.
     */
    function removeMaintainer(address _maintainerAddress) external onlyKeeper {
        require(_maintainers.remove(_maintainerAddress), Errors.REMOVE_FROM_LIST_FAILED);
    }

    ///////////////////////////////////////////////////////////////////////////
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

interface IStrategy {
    function rebalance()
        external
        returns (
            uint256 _profit,
            uint256 _loss,
            uint256 _payback
        );

    function sweepERC20(address _fromToken) external;

    function withdraw(uint256 _amount) external;

    function feeCollector() external view returns (address);

    function isReservedToken(address _token) external view returns (bool);

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

    function migrate(address _newStrategy) external;

    function token() external view returns (address);

    function pool() external view returns (address);

    // solhint-disable-next-line func-name-mixedcase
    function VERSION() external view returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

/// @title Errors library
library Errors {
    string public constant INVALID_COLLATERAL_AMOUNT = "1"; // Collateral must be greater than 0 or > defined limit
    string public constant INVALID_SHARE_AMOUNT = "2"; // Share must be greater than 0
    string public constant INVALID_INPUT_LENGTH = "3"; // Input array length must be greater than 0
    string public constant INPUT_LENGTH_MISMATCH = "4"; // Input array length mismatch with another array length
    string public constant NOT_WHITELISTED_ADDRESS = "5"; // Caller is not whitelisted to withdraw without fee
    string public constant MULTI_TRANSFER_FAILED = "6"; // Multi transfer of tokens has failed
    string public constant FEE_COLLECTOR_NOT_SET = "7"; // Fee Collector is not set
    string public constant NOT_ALLOWED_TO_SWEEP = "8"; // Token is not allowed to sweep
    string public constant INSUFFICIENT_BALANCE = "9"; // Insufficient balance to performs operations to follow
    string public constant INPUT_ADDRESS_IS_ZERO = "10"; // Input address is zero
    string public constant FEE_LIMIT_REACHED = "11"; // Fee must be less than MAX_BPS
    string public constant ALREADY_INITIALIZED = "12"; // Data structure, contract, or logic already initialized and can not be called again
    string public constant ADD_IN_LIST_FAILED = "13"; // Cannot add address in address list
    string public constant REMOVE_FROM_LIST_FAILED = "14"; // Cannot remove address from address list
    string public constant STRATEGY_IS_ACTIVE = "15"; // Strategy is already active, an inactive strategy is required
    string public constant STRATEGY_IS_NOT_ACTIVE = "16"; // Strategy is not active, an active strategy is required
    string public constant INVALID_STRATEGY = "17"; // Given strategy is not a strategy of this pool
    string public constant DEBT_RATIO_LIMIT_REACHED = "18"; // Debt ratio limit reached. It must be less than MAX_BPS
    string public constant TOTAL_DEBT_IS_NOT_ZERO = "19"; // Strategy total debt must be 0
    string public constant LOSS_TOO_HIGH = "20"; // Strategy reported loss must be less than current debt
    string public constant INVALID_MAX_BORROW_LIMIT = "21"; // Max borrow limit is beyond range.
    string public constant MAX_LIMIT_LESS_THAN_MIN = "22"; // Max limit should be greater than min limit.
    string public constant INVALID_SLIPPAGE = "23"; // Slippage should be less than MAX_BPS
    string public constant WRONG_RECEIPT_TOKEN = "24"; // Wrong receipt token address
    string public constant AAVE_FLASH_LOAN_NOT_ACTIVE = "25"; // aave flash loan is not active
    string public constant DYDX_FLASH_LOAN_NOT_ACTIVE = "26"; // DYDX flash loan is not active
    string public constant INVALID_FLASH_LOAN = "27"; // invalid-flash-loan
    string public constant INVALID_INITIATOR = "28"; // "invalid-initiator"
    string public constant INCORRECT_WITHDRAW_AMOUNT = "29"; // withdrawn amount is not correct
    string public constant NO_MARKET_ID_FOUND = "30"; // dydx flash loan no marketId found for token
    string public constant SAME_AS_PREVIOUS = "31"; // Input should not be same as previous value.
    string public constant INVALID_INPUT = "32"; // Generic invalid input error code
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./dependencies/openzeppelin/contracts/proxy/utils/Initializable.sol";
import "./dependencies/openzeppelin/contracts/utils/Context.sol";
import "./interfaces/vesper/IGovernable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (governor) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the governor account will be the one that deploys the contract. This
 * can later be changed with {transferGovernorship}.
 *
 */
abstract contract Governable is IGovernable, Context, Initializable {
    address public governor;
    address private proposedGovernor;

    event UpdatedGovernor(address indexed previousGovernor, address indexed proposedGovernor);

    /**
     * @dev Initializes the contract setting the deployer as the initial governor.
     */
    constructor() {
        address msgSender = _msgSender();
        governor = msgSender;
        emit UpdatedGovernor(address(0), msgSender);
    }

    /**
     * @dev If inheriting child is using proxy then child contract can use
     * __Governable_init() function to initialization this contract
     */
    // solhint-disable-next-line func-name-mixedcase
    function __Governable_init() internal initializer {
        address msgSender = _msgSender();
        governor = msgSender;
        emit UpdatedGovernor(address(0), msgSender);
    }

    /**
     * @dev Throws if called by any account other than the governor.
     */
    modifier onlyGovernor() {
        require(governor == _msgSender(), "not-governor");
        _;
    }

    /**
     * @dev Transfers governorship of the contract to a new account (`proposedGovernor`).
     * Can only be called by the current owner.
     */
    function transferGovernorship(address _proposedGovernor) external onlyGovernor {
        require(_proposedGovernor != address(0), "proposed-governor-is-zero");
        proposedGovernor = _proposedGovernor;
    }

    /**
     * @dev Allows new governor to accept governorship of the contract.
     */
    function acceptGovernorship() external {
        require(proposedGovernor == _msgSender(), "not-the-proposed-governor");
        emit UpdatedGovernor(governor, proposedGovernor);
        governor = proposedGovernor;
        proposedGovernor = address(0);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "./dependencies/openzeppelin/contracts/utils/Context.sol";
import "./interfaces/vesper/IPausable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 */
abstract contract Pausable is IPausable, Context {
    event Paused(address account);
    event Shutdown(address account);
    event Unpaused(address account);
    event Open(address account);

    bool public paused;
    bool public stopEverything;

    modifier whenNotPaused() {
        require(!paused, "paused");
        _;
    }
    modifier whenPaused() {
        require(paused, "not-paused");
        _;
    }

    modifier whenNotShutdown() {
        require(!stopEverything, "shutdown");
        _;
    }

    modifier whenShutdown() {
        require(stopEverything, "not-shutdown");
        _;
    }

    /// @dev Pause contract operations, if contract is not paused.
    function _pause() internal virtual whenNotPaused {
        paused = true;
        emit Paused(_msgSender());
    }

    /// @dev Unpause contract operations, allow only if contract is paused and not shutdown.
    function _unpause() internal virtual whenPaused whenNotShutdown {
        paused = false;
        emit Unpaused(_msgSender());
    }

    /// @dev Shutdown contract operations, if not already shutdown.
    function _shutdown() internal virtual whenNotShutdown {
        stopEverything = true;
        paused = true;
        emit Shutdown(_msgSender());
    }

    /// @dev Open contract operations, if contract is in shutdown state
    function _open() internal virtual whenShutdown {
        stopEverything = false;
        emit Open(_msgSender());
    }
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor () {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/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/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            // solhint-disable-next-line no-inline-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
        } else if (signature.length == 64) {
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            // solhint-disable-next-line no-inline-assembly
            assembly {
                let vs := mload(add(signature, 0x40))
                r := mload(add(signature, 0x20))
                s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
                v := add(shr(255, vs), 27)
            }
        } else {
            revert("ECDSA: invalid signature length");
        }

        return recover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @notice Governable interface
 */
interface IGovernable {
    function governor() external view returns (address _governor);

    function transferGovernorship(address _proposedGovernor) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @notice Pausable interface
 */
interface IPausable {
    function paused() external view returns (bool);

    function stopEverything() external view returns (bool);

    function pause() external;

    function unpause() external;

    function shutdown() external;

    function open() external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

interface IPoolAccountant {
    function decreaseDebt(address _strategy, uint256 _decreaseBy) external;

    function migrateStrategy(address _old, address _new) external;

    function reportEarning(
        address _strategy,
        uint256 _profit,
        uint256 _loss,
        uint256 _payback
    ) external returns (uint256 _actualPayback, uint256 _creditLine);

    function reportLoss(address _strategy, uint256 _loss) external;

    function availableCreditLimit(address _strategy) external view returns (uint256);

    function excessDebt(address _strategy) external view returns (uint256);

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

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

    function strategy(address _strategy)
        external
        view
        returns (
            bool _active,
            uint256 _interestFee, // Obsolete
            uint256 _debtRate, // Obsolete
            uint256 _lastRebalance,
            uint256 _totalDebt,
            uint256 _totalLoss,
            uint256 _totalProfit,
            uint256 _debtRatio,
            uint256 _externalDepositFee
        );

    function externalDepositFee() external view returns (uint256);

    function totalDebt() external view returns (uint256);

    function totalDebtOf(address _strategy) external view returns (uint256);

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

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

interface IPoolRewards {
    /// Emitted after reward added
    event RewardAdded(address indexed rewardToken, uint256 reward, uint256 rewardDuration);
    /// Emitted whenever any user claim rewards
    event RewardPaid(address indexed user, address indexed rewardToken, uint256 reward);
    /// Emitted after adding new rewards token into rewardTokens array
    event RewardTokenAdded(address indexed rewardToken, address[] existingRewardTokens);

    function claimReward(address) external;

    function notifyRewardAmount(
        address _rewardToken,
        uint256 _rewardAmount,
        uint256 _rewardDuration
    ) external;

    function notifyRewardAmount(
        address[] memory _rewardTokens,
        uint256[] memory _rewardAmounts,
        uint256[] memory _rewardDurations
    ) external;

    function updateReward(address) external;

    function claimable(address _account)
        external
        view
        returns (address[] memory _rewardTokens, uint256[] memory _claimableAmounts);

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

    function rewardForDuration()
        external
        view
        returns (address[] memory _rewardTokens, uint256[] memory _rewardForDuration);

    function rewardPerToken()
        external
        view
        returns (address[] memory _rewardTokens, uint256[] memory _rewardPerTokenRate);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../../dependencies/openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "./IGovernable.sol";
import "./IPausable.sol";

interface IVesperPool is IGovernable, IPausable, IERC20Metadata {
    function calculateUniversalFee(uint256 _profit) external view returns (uint256 _fee);

    function deposit(uint256 _share) external;

    function multiTransfer(address[] memory _recipients, uint256[] memory _amounts) external returns (bool);

    function excessDebt(address _strategy) external view returns (uint256);

    function poolAccountant() external view returns (address);

    function poolRewards() external view returns (address);

    function reportEarning(
        uint256 _profit,
        uint256 _loss,
        uint256 _payback
    ) external;

    function reportLoss(uint256 _loss) external;

    function sweepERC20(address _fromToken) external;

    function withdraw(uint256 _amount) external;

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

    function isKeeper(address _address) external view returns (bool);

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

    function isMaintainer(address _address) external view returns (bool);

    function pricePerShare() external view returns (uint256);

    function strategy(address _strategy)
        external
        view
        returns (
            bool _active,
            uint256 _interestFee, // Obsolete
            uint256 _debtRate, // Obsolete
            uint256 _lastRebalance,
            uint256 _totalDebt,
            uint256 _totalLoss,
            uint256 _totalProfit,
            uint256 _debtRatio,
            uint256 _externalDepositFee
        );

    function token() external view returns (IERC20);

    function tokensHere() external view returns (uint256);

    function totalDebtOf(address _strategy) external view returns (uint256);

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

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../dependencies/openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../dependencies/openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "../dependencies/openzeppelin/contracts/utils/Context.sol";

// solhint-disable reason-string, no-empty-blocks
///@title Pool ERC20 to use with proxy. Inspired by OpenZeppelin ERC20
abstract contract PoolERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Sets the values for {name} and {symbol} for proxy
     */
    // solhint-disable-next-line func-name-mixedcase
    function __ERC20_init(string memory name_, string memory symbol_) internal {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the decimals of the token. default to 18
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev Returns total supply of the token.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev  Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

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

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

        _totalSupply += amount;
        _balances[account] += amount;

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

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

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

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

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

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../dependencies/openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";
import "../dependencies/openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "./PoolERC20.sol";

///@title Pool ERC20 Permit to use with proxy. Inspired by OpenZeppelin ERC20Permit
// solhint-disable var-name-mixedcase
abstract contract PoolERC20Permit is PoolERC20, IERC20Permit {
    bytes32 private constant _EIP712_VERSION = keccak256(bytes("1"));
    bytes32 private constant _EIP712_DOMAIN_TYPEHASH =
        keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
    bytes32 private constant _PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    bytes32 private _CACHED_DOMAIN_SEPARATOR;
    bytes32 private _HASHED_NAME;
    uint256 private _CACHED_CHAIN_ID;

    /**
     * @dev See {IERC20Permit-nonces}.
     */
    mapping(address => uint256) public override nonces;

    /**
     * @dev Initializes the domain separator using the `name` parameter, and setting `version` to `"1"`.
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __ERC20Permit_init(string memory name_) internal {
        _HASHED_NAME = keccak256(bytes(name_));
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(_EIP712_DOMAIN_TYPEHASH, _HASHED_NAME, _EIP712_VERSION);
    }

    /**
     * @dev See {IERC20Permit-permit}.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        // solhint-disable-next-line not-rely-on-time
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");
        uint256 _currentNonce = nonces[owner];
        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _currentNonce, deadline));
        bytes32 hash = keccak256(abi.encodePacked("\x19\x01", _domainSeparatorV4(), structHash));

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == owner, "ERC20Permit: invalid signature");
        nonces[owner] = _currentNonce + 1;
        _approve(owner, spender, value);
    }

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

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() private view returns (bytes32) {
        if (block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_EIP712_DOMAIN_TYPEHASH, _HASHED_NAME, _EIP712_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 name,
        bytes32 version
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, name, version, block.chainid, address(this)));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "../dependencies/openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../dependencies/openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "../interfaces/vesper/IVesperPool.sol";

abstract contract PoolStorageV1 is IVesperPool {
    ///@notice Collateral token address
    IERC20 public token;
    /// @notice PoolAccountant address
    address public poolAccountant;
    /// @notice PoolRewards contract address
    address public poolRewards;
    address private feeWhitelistObsolete; // Obsolete in favor of AddressSet of feeWhitelist
    address private keepersObsolete; // Obsolete in favor of AddressSet of keepers
    address private maintainersObsolete; // Obsolete in favor of AddressSet of maintainers
    address private feeCollectorObsolete; // Fee collector address. Obsolete as there is no fee to collect
    uint256 private withdrawFeeObsolete; // Withdraw fee for this pool. Obsolete in favor of universal fee
    uint256 private decimalConversionFactorObsolete; // It can be used in converting value to/from 18 decimals
    bool internal withdrawInETH; // This flag will be used by VETH pool as switch to withdraw ETH or WETH
}

abstract contract PoolStorageV2 is PoolStorageV1 {
    EnumerableSet.AddressSet private _feeWhitelistObsolete; // Obsolete in favor of universal fee
    EnumerableSet.AddressSet internal _keepers; // List of keeper addresses
    EnumerableSet.AddressSet internal _maintainers; // List of maintainer addresses
}

abstract contract PoolStorageV3 is PoolStorageV2 {
    /// @notice Universal fee of this pool. Default to 2%
    uint256 public universalFee = 200;
    /// @notice Maximum percentage of profit that can be counted as universal fee. Default to 50%
    uint256 public maxProfitAsFee = 5_000;
    /// @notice Minimum deposit limit.
    /// @dev Do not set it to 0 as deposit() is checking if amount >= limit
    uint256 public minDepositLimit = 1;
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b56657370657220706f6f6c000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000576506f6f6c000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _name (string): Vesper pool
Arg [1] : _symbol (string): vPool
Arg [2] : _token (address): 0x0000000000000000000000000000000000000000

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000b
Arg [4] : 56657370657220706f6f6c000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [6] : 76506f6f6c000000000000000000000000000000000000000000000000000000