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// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;

import "./SingleAssetVault.sol";
import "../interfaces/IStaking.sol";

/// @dev This version adds support for using "boosted" user balances.
///  Boosted user balances will take user's staking balance into account.
contract SingleAssetVaultV2 is SingleAssetVault {
  event StakingContractUpdated(address _staking);
  /// @dev Track the boosted balances for all users
  mapping(address => uint256) internal boostedUserBalances;
  /// @dev Track the total boosted balance
  uint256 internal totalBoostedBalance;

  /// @dev Struct to store the formula weights that is used to calculate the boosted balance.
  struct BoostFormulaWeights {
    uint128 vaultBalanceWeight;
    uint128 stakingBalanceWeight;
  }
  BoostFormulaWeights public boostFormulaWeights;
  /// @dev Address of the staking contract
  address public stakingContract;

  /// @custom:oz-upgrades-unsafe-allow constructor
  constructor() initializer {}

  function initializeV2(
    string memory _name,
    string memory _symbol,
    address _governance,
    address _gatekeeper,
    address _feeCollection,
    address _strategyDataStoreAddress,
    address _token,
    address _accessManager,
    address _vaultRewards,
    address _stakingContract
  ) external virtual initializer {
    __SingleAssetVaultV2_init(
      _name,
      _symbol,
      _governance,
      _gatekeeper,
      _feeCollection,
      _strategyDataStoreAddress,
      _token,
      _accessManager,
      _vaultRewards,
      _stakingContract
    );
  }

  // solhint-disable-next-line func-name-mixedcase
  function __SingleAssetVaultV2_init(
    string memory _name,
    string memory _symbol,
    address _governance,
    address _gatekeeper,
    address _feeCollection,
    address _strategyDataStoreAddress,
    address _token,
    address _accessManager,
    address _vaultRewards,
    address _stakingContract
  ) internal {
    __SingleAssetVault_init(
      _name,
      _symbol,
      _governance,
      _gatekeeper,
      _feeCollection,
      _strategyDataStoreAddress,
      _token,
      _accessManager,
      _vaultRewards
    );
    __SingleAssetVaultV2_init_unchained(_stakingContract);
  }

  function __SingleAssetVaultV2_init_unchained(address _stakingContract) internal {
    require(_stakingContract != address(0), "!staking");
    stakingContract = _stakingContract;
    boostFormulaWeights.vaultBalanceWeight = 1;
    boostFormulaWeights.stakingBalanceWeight = 9;
  }

  function version() external pure virtual override returns (string memory) {
    return "0.2.0";
  }

  /// @notice Query the boosted vault balance of the user.
  /// @dev If no boosted vault balance but there is a normal balance for the user, it means the boosted balance hasn't been inited yet.
  ///   Return the normal balance to keep it backward compatible.
  /// @param _user the address of the user to query
  /// @return the boosted balance of the user
  function boostedBalanceOf(address _user) external view returns (uint256) {
    require(_user != address(0), "!user");
    if (boostedUserBalances[_user] == 0 && balanceOf(_user) > 0) {
      return balanceOf(_user);
    }
    return boostedUserBalances[_user];
  }

  /// @notice Return the total of boosted balances
  /// @dev If no total boosted balance but there is totalSupply, it means the boosted balance hasn't been inited yet.
  ///  Return the normal totalSupply in this case.
  function totalBoostedSupply() external view returns (uint256) {
    if (totalBoostedBalance == 0 && totalSupply() > 0) {
      return totalSupply();
    }
    return totalBoostedBalance;
  }

  /// @notice Set the address of the staking contract. Can only be called by governance.
  /// @dev This needs to be called after upgrading from v1 to v2 version to ensure the staking contract address is set.
  /// @param _stakingContract The address of the staking contract.
  function setStakingContract(address _stakingContract) external {
    _onlyGovernance();
    require(_stakingContract != address(0), "!staking");
    if (_stakingContract != stakingContract) {
      stakingContract = _stakingContract;
      emit StakingContractUpdated(_stakingContract);
    }
  }

  /// @notice Set the weight used to calculate the boosted balance. Can only be called by governance.
  /// @dev This needs to be called after upgrading from v1 to v2 version.
  ///  Also once this is called, the `updateBoostedBalancesForUsers` should be called as well with all the vault user addresses to recalculate the boosted balances.
  function setBoostedFormulaWeights(uint128 _vaultWeight, uint128 _stakingWeight) external {
    _onlyGovernance();
    boostFormulaWeights.vaultBalanceWeight = _vaultWeight;
    boostFormulaWeights.stakingBalanceWeight = _stakingWeight;
  }

  /// @notice Recalculate the boosted balances for the given array of users.
  /// @dev Before the boosted balance is updated for a user, it will also ensure the rewards up to this point is calculated for the user.
  ///  This function must be called whenever `setBoostedFormulaWeights` is called to recalcuate the boosted balances for users.
  ///  It can also be called at anytime afterwards to reset the boosted balances for a user (or users).
  function updateBoostedBalancesForUsers(address[] calldata _users) external {
    uint256 totalBalanceToReduce;
    uint256 totalBalanceToAdd;
    for (uint256 i = 0; i < _users.length; i++) {
      if (vaultRewards != address(0)) {
        IYOPRewards(vaultRewards).calculateVaultRewards(_users[i]);
      }
      uint256 oldBoostedBalance = boostedUserBalances[_users[i]];
      uint256 newBoostedBalance = _calculateBoostedBalanceForUser(_users[i]);
      boostedUserBalances[_users[i]] = newBoostedBalance;
      totalBalanceToReduce += oldBoostedBalance;
      totalBalanceToAdd += newBoostedBalance;
    }
    // only update the storage value once at the end to save gas
    totalBoostedBalance = totalBoostedBalance - totalBalanceToReduce + totalBalanceToAdd;
  }

  /// @notice Returns the latest boosted balance of the user based on their latest staking and vault positions
  ///  Use this function and boostedBalanceOf to check if a user's boosted balance should be updated
  /// @param _user the address of the user to query
  /// @return the latest boosted balance for the user
  function latestBoostedBalanceOf(address _user) external view returns (uint256) {
    return _calculateBoostedBalanceForUser(_user);
  }

  function _calculateBoostedBalanceForUser(address _user) internal view returns (uint256) {
    return
      VaultUtils.calculateBoostedVaultBalance(
        _user,
        stakingContract,
        address(this),
        boostFormulaWeights.vaultBalanceWeight,
        boostFormulaWeights.stakingBalanceWeight
      );
  }

  /// @dev This hook is called by the OZ ERC20 contract after the user balance is updated.
  ///  At this point we can update the boosted balance as well.
  function _afterTokenTransfer(
    address _from,
    address _to,
    uint256
  ) internal virtual override {
    uint256 totalReduce;
    uint256 totalAdd;
    if (_from != address(0)) {
      uint256 newBoostedBalance = _calculateBoostedBalanceForUser(_from);
      uint256 oldBoostedBalance = boostedUserBalances[_from];
      boostedUserBalances[_from] = newBoostedBalance;
      totalReduce += oldBoostedBalance;
      totalAdd += newBoostedBalance;
    }
    if (_to != address(0)) {
      uint256 newBoostedBalance = _calculateBoostedBalanceForUser(_to);
      uint256 oldBoostedBalance = boostedUserBalances[_to];
      boostedUserBalances[_to] = newBoostedBalance;
      totalReduce += oldBoostedBalance;
      totalAdd += newBoostedBalance;
    }
    totalBoostedBalance = totalBoostedBalance - totalReduce + totalAdd;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;

import "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "../interfaces/IHealthCheck.sol";
import "../interfaces/IStrategy.sol";
import "../interfaces/IAccessControlManager.sol";
import "../interfaces/IFeeCollection.sol";
import "./SingleAssetVaultBase.sol";

///  @dev NOTE: do not add any new state variables to this contract. If needed, see {VaultDataStorage.sol} instead.
contract SingleAssetVault is SingleAssetVaultBase, PausableUpgradeable, ReentrancyGuardUpgradeable, UUPSUpgradeable {
  using SafeERC20Upgradeable for IERC20Upgradeable;

  event StrategyReported(
    address indexed _strategyAddress,
    uint256 _gain,
    uint256 _loss,
    uint256 _debtPaid,
    uint256 _totalGain,
    uint256 _totalLoss,
    uint256 _totalDebt,
    uint256 _debtAdded,
    uint256 _debtRatio
  );

  uint256 internal constant SECONDS_PER_YEAR = 31_556_952; // 365.2425 days
  string internal constant API_VERSION = "0.1.0";

  // solhint-disable-next-line no-empty-blocks
  constructor() {}

  function initialize(
    string memory _name,
    string memory _symbol,
    address _governance,
    address _gatekeeper,
    address _feeCollection,
    address _strategyDataStoreAddress,
    address _token,
    address _accessManager,
    address _vaultRewards
  ) external initializer {
    __SingleAssetVault_init(
      _name,
      _symbol,
      _governance,
      _gatekeeper,
      _feeCollection,
      _strategyDataStoreAddress,
      _token,
      _accessManager,
      _vaultRewards
    );
  }

  // solhint-disable-next-line func-name-mixedcase
  function __SingleAssetVault_init(
    string memory _name,
    string memory _symbol,
    address _governance,
    address _gatekeeper,
    address _feeCollection,
    address _strategyDataStoreAddress,
    address _token,
    address _accessManager,
    address _vaultRewards
  ) internal {
    __SingleAssetVaultBase_init(
      _name,
      _symbol,
      _governance,
      _gatekeeper,
      _feeCollection,
      _strategyDataStoreAddress,
      _token,
      _accessManager,
      _vaultRewards
    );
    _pause();
  }

  function version() external pure virtual returns (string memory) {
    return API_VERSION;
  }

  function pause() external {
    _onlyGovernanceOrGatekeeper(governance);
    _pause();
  }

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

  /// @notice Deposits `_amount` `token`, issuing shares to `recipient`. If the
  ///  Vault is in Emergency Shutdown, deposits will not be accepted and this
  ///  call will fail.
  /// @dev Measuring quantity of shares to issues is based on the total
  ///  outstanding debt that this contract has ("expected value") instead
  ///  of the total balance sheet it has ("estimated value") has important
  ///  security considerations, and is done intentionally. If this value were
  ///  measured against external systems, it could be purposely manipulated by
  ///  an attacker to withdraw more assets than they otherwise should be able
  ///  to claim by redeeming their shares.
  ///  On deposit, this means that shares are issued against the total amount
  ///  that the deposited capital can be given in service of the debt that
  ///  Strategies assume. If that number were to be lower than the "expected
  ///  value" at some future point, depositing shares via this method could
  ///  entitle the depositor to *less* than the deposited value once the
  ///  "realized value" is updated from further reports by the Strategies
  ///  to the Vaults.
  ///  Care should be taken by integrators to account for this discrepancy,
  ///  by using the view-only methods of this contract (both off-chain and
  ///  on-chain) to determine if depositing into the Vault is a "good idea".
  /// @param _amount The quantity of tokens to deposit, defaults to all.
  ///  caller's address.
  /// @param _recipient the address that will receive the vault shares
  /// @return The issued Vault shares.
  function deposit(uint256 _amount, address _recipient) external whenNotPaused nonReentrant returns (uint256) {
    _onlyNotEmergencyShutdown();
    return _deposit(_amount, _recipient);
  }

  /// @notice Withdraws the calling account's tokens from this Vault, redeeming
  ///  amount `_shares` for an appropriate amount of tokens.
  ///  See note on `setWithdrawalQueue` for further details of withdrawal
  ///  ordering and behavior.
  /// @dev Measuring the value of shares is based on the total outstanding debt
  ///  that this contract has ("expected value") instead of the total balance
  ///  sheet it has ("estimated value") has important security considerations,
  ///  and is done intentionally. If this value were measured against external
  ///  systems, it could be purposely manipulated by an attacker to withdraw
  ///  more assets than they otherwise should be able to claim by redeeming
  ///  their shares.

  ///  On withdrawal, this means that shares are redeemed against the total
  ///  amount that the deposited capital had "realized" since the point it
  ///  was deposited, up until the point it was withdrawn. If that number
  ///  were to be higher than the "expected value" at some future point,
  ///  withdrawing shares via this method could entitle the depositor to
  ///  *more* than the expected value once the "realized value" is updated
  ///  from further reports by the Strategies to the Vaults.

  ///  Under exceptional scenarios, this could cause earlier withdrawals to
  ///  earn "more" of the underlying assets than Users might otherwise be
  ///  entitled to, if the Vault's estimated value were otherwise measured
  ///  through external means, accounting for whatever exceptional scenarios
  ///  exist for the Vault (that aren't covered by the Vault's own design.)
  ///  In the situation where a large withdrawal happens, it can empty the
  ///  vault balance and the strategies in the withdrawal queue.
  ///  Strategies not in the withdrawal queue will have to be harvested to
  ///  rebalance the funds and make the funds available again to withdraw.
  /// @param _maxShares How many shares to try and redeem for tokens, defaults to all.
  /// @param _recipient The address to issue the shares in this Vault to.
  /// @param _maxLoss The maximum acceptable loss to sustain on withdrawal in basis points.
  /// @return The quantity of tokens redeemed for `_shares`.
  function withdraw(
    uint256 _maxShares,
    address _recipient,
    uint256 _maxLoss
  ) external whenNotPaused nonReentrant returns (uint256) {
    _onlyNotEmergencyShutdown();
    return _withdraw(_maxShares, _recipient, _maxLoss);
  }

  /// @notice Reports the amount of assets the calling Strategy has free (usually in terms of ROI).
  ///  The performance fee is determined here, off of the strategy's profits
  ///  (if any), and sent to governance.
  ///  The strategist's fee is also determined here (off of profits), to be
  ///  handled according to the strategist on the next harvest.
  ///  This may only be called by a Strategy managed by this Vault.
  /// @dev For approved strategies, this is the most efficient behavior.
  ///  The Strategy reports back what it has free, then Vault "decides"
  ///  whether to take some back or give it more. Note that the most it can
  ///  take is `gain + _debtPayment`, and the most it can give is all of the
  ///  remaining reserves. Anything outside of those bounds is abnormal behavior.
  ///  All approved strategies must have increased diligence around
  ///  calling this function, as abnormal behavior could become catastrophic.
  /// @param _gain Amount Strategy has realized as a gain on it's investment since its last report, and is free to be given back to Vault as earnings
  /// @param _loss Amount Strategy has realized as a loss on it's investment since its last report, and should be accounted for on the Vault's balance sheet.
  ///  The loss will reduce the debtRatio. The next time the strategy will harvest, it will pay back the debt in an attempt to adjust to the new debt limit.
  /// @param _debtPayment Amount Strategy has made available to cover outstanding debt
  /// @return Amount of debt outstanding (if totalDebt > debtLimit or emergency shutdown).
  function report(
    uint256 _gain,
    uint256 _loss,
    uint256 _debtPayment
  ) external returns (uint256) {
    address strat = _msgSender();
    _validateStrategy(strat);
    require(token.balanceOf(strat) >= (_gain + _debtPayment), "!balance");

    VaultUtils.checkStrategyHealth(
      healthCheck,
      strat,
      _gain,
      _loss,
      _debtPayment,
      _debtOutstanding(strat),
      strategies[strat].totalDebt
    );
    totalDebt = VaultUtils.reportLoss(strategies, strat, totalDebt, _strategyDataStore(), _loss);
    // Returns are always "realized gains"
    strategies[strat].totalGain = strategies[strat].totalGain + _gain;

    // Assess both management fee and performance fee, and issue both as shares of the vault
    uint256 totalFees = VaultUtils.assessFees(
      token,
      feeCollection,
      strategies,
      strat,
      _gain,
      managementFee,
      _strategyDataStore().strategyPerformanceFee(address(this), strat)
    );
    // Compute the line of credit the Vault is able to offer the Strategy (if any)
    uint256 credit = _creditAvailable(strat);
    // Outstanding debt the Strategy wants to take back from the Vault (if any)
    // NOTE: debtOutstanding <= StrategyInfo.totalDebt
    uint256 debt = _debtOutstanding(strat);
    uint256 debtPayment = Math.min(debt, _debtPayment);

    if (debtPayment > 0) {
      _decreaseDebt(strat, debtPayment);
      debt = debt - debtPayment;
    }

    // Update the actual debt based on the full credit we are extending to the Strategy
    // or the returns if we are taking funds back
    // NOTE: credit + self.strategies[msg.sender].totalDebt is always < self.debtLimit
    // NOTE: At least one of `credit` or `debt` is always 0 (both can be 0)
    if (credit > 0) {
      _increaseDebt(strat, credit);
    }

    // Give/take balance to Strategy, based on the difference between the reported gains
    // (if any), the debt payment (if any), the credit increase we are offering (if any),
    // and the debt needed to be paid off (if any)
    // NOTE: This is just used to adjust the balance of tokens between the Strategy and
    //       the Vault based on the Strategy's debt limit (as well as the Vault's).
    uint256 totalAvailable = _gain + debtPayment;
    if (totalAvailable < credit) {
      // credit surplus, give to Strategy
      token.safeTransfer(strat, credit - totalAvailable);
    } else if (totalAvailable > credit) {
      // credit deficit, take from Strategy
      token.safeTransferFrom(strat, address(this), totalAvailable - credit);
    }
    // else, don't do anything because it is balanced

    _updateLockedProfit(_gain, totalFees, _loss);
    // solhint-disable-next-line not-rely-on-time
    strategies[strat].lastReport = block.timestamp;
    // solhint-disable-next-line not-rely-on-time
    lastReport = block.timestamp;

    StrategyInfo memory info = strategies[strat];
    uint256 ratio = _strategyDataStore().strategyDebtRatio(address(this), strat);
    emit StrategyReported(
      strat,
      _gain,
      _loss,
      debtPayment,
      info.totalGain,
      info.totalLoss,
      info.totalDebt,
      credit,
      ratio
    );

    if (ratio == 0 || emergencyShutdown) {
      // Take every last penny the Strategy has (Emergency Exit/revokeStrategy)
      // NOTE: This is different than `debt` in order to extract *all* of the returns
      return IStrategy(strat).estimatedTotalAssets();
    } else {
      // Otherwise, just return what we have as debt outstanding
      return debt;
    }
  }

  function _deposit(uint256 _amount, address _recipient) internal returns (uint256) {
    require(_recipient != address(0), "!recipient");
    if (accessManager != address(0)) {
      require(IAccessControlManager(accessManager).hasAccess(_msgSender(), address(this)), "!access");
    }
    //TODO: do we also want to cap the `_amount` too?
    uint256 amount = _ensureValidDepositAmount(_msgSender(), _amount);
    uint256 shares = _issueSharesForAmount(_recipient, amount);
    token.safeTransferFrom(_msgSender(), address(this), amount);
    return shares;
  }

  function _issueSharesForAmount(address _recipient, uint256 _amount) internal returns (uint256) {
    uint256 supply = totalSupply();
    uint256 shares = supply > 0 ? (_amount * supply) / _freeFunds() : _amount;

    require(shares > 0, "!amount");
    // _mint will call '_beforeTokenTransfer' which will call "calculateRewards" on the YOPVaultRewards contract
    _mint(_recipient, shares);
    return shares;
  }

  function _withdraw(
    uint256 _maxShares,
    address _recipient,
    uint256 _maxLoss
  ) internal returns (uint256) {
    require(_recipient != address(0), "!recipient");
    require(_maxLoss <= MAX_BASIS_POINTS, "!loss");
    uint256 shares = _ensureValidShares(_msgSender(), _maxShares);
    uint256 value = _shareValue(shares);
    uint256 vaultBalance = token.balanceOf(address(this));
    uint256 totalLoss = 0;
    if (value > vaultBalance) {
      // We need to go get some from our strategies in the withdrawal queue
      // NOTE: This performs forced withdrawals from each Strategy. During
      // forced withdrawal, a Strategy may realize a loss. That loss
      // is reported back to the Vault, and the will affect the amount
      // of tokens that the withdrawer receives for their shares. They
      // can optionally specify the maximum acceptable loss (in BPS)
      // to prevent excessive losses on their withdrawals (which may
      // happen in certain edge cases where Strategies realize a loss)
      totalLoss = _withdrawFromStrategies(value);
      if (totalLoss > 0) {
        value = value - totalLoss;
      }
      vaultBalance = token.balanceOf(address(this));
    }
    // NOTE: We have withdrawn everything possible out of the withdrawal queue,
    // but we still don't have enough to fully pay them back, so adjust
    // to the total amount we've freed up through forced withdrawals
    if (value > vaultBalance) {
      value = vaultBalance;
      // NOTE: Burn # of shares that corresponds to what Vault has on-hand,
      // including the losses that were incurred above during withdrawals
      shares = _sharesForAmount(value + totalLoss);
    }
    // NOTE: This loss protection is put in place to revert if losses from
    // withdrawing are more than what is considered acceptable.
    require(totalLoss <= (_maxLoss * (value + totalLoss)) / MAX_BASIS_POINTS, "loss limit");
    // burn shares
    // _burn will call '_beforeTokenTransfer' which will call "calculateRewards" on the YOPVaultRewards contract
    _burn(_msgSender(), shares);

    // Withdraw remaining balance to _recipient (may be different to msg.sender) (minus fee)
    token.safeTransfer(_recipient, value);
    return value;
  }

  function _withdrawFromStrategies(uint256 _withdrawValue) internal returns (uint256) {
    uint256 totalLoss = 0;
    uint256 value = _withdrawValue;
    address[] memory withdrawQueue = _strategyDataStore().withdrawQueue(address(this));
    for (uint256 i = 0; i < withdrawQueue.length; i++) {
      address strategyAddress = withdrawQueue[i];
      IStrategy strategyToWithdraw = IStrategy(strategyAddress);
      uint256 vaultBalance = token.balanceOf(address(this));
      if (value <= vaultBalance) {
        // there are enough tokens in the vault now, no need to continue
        break;
      }
      // NOTE: Don't withdraw more than the debt so that Strategy can still
      // continue to work based on the profits it has
      // NOTE: This means that user will lose out on any profits that each
      // Strategy in the queue would return on next harvest, benefiting others
      uint256 amountNeeded = Math.min(value - vaultBalance, strategies[strategyAddress].totalDebt);
      if (amountNeeded == 0) {
        // nothing to withdraw from the strategy, try the next one
        continue;
      }
      uint256 loss = strategyToWithdraw.withdraw(amountNeeded);
      uint256 withdrawAmount = token.balanceOf(address(this)) - vaultBalance;
      if (loss > 0) {
        value = value - loss;
        totalLoss = totalLoss + loss;
        totalDebt = VaultUtils.reportLoss(strategies, strategyAddress, totalDebt, _strategyDataStore(), loss);
      }

      // Reduce the Strategy's debt by the amount withdrawn ("realized returns")
      // NOTE: This doesn't add to returns as it's not earned by "normal means"
      _decreaseDebt(strategyAddress, withdrawAmount);
    }
    return totalLoss;
  }

  function _ensureValidShares(address _account, uint256 _shares) internal view returns (uint256) {
    uint256 shares = Math.min(_shares, balanceOf(_account));
    require(shares > 0, "!shares");
    return shares;
  }

  function _increaseDebt(address _strategy, uint256 _amount) internal {
    strategies[_strategy].totalDebt = strategies[_strategy].totalDebt + _amount;
    totalDebt = totalDebt + _amount;
  }

  function _decreaseDebt(address _strategy, uint256 _amount) internal {
    strategies[_strategy].totalDebt = strategies[_strategy].totalDebt - _amount;
    totalDebt = totalDebt - _amount;
  }

  function _ensureValidDepositAmount(address _account, uint256 _amount) internal view returns (uint256) {
    uint256 amount = Math.min(_amount, token.balanceOf(_account));
    amount = Math.min(amount, _availableDepositLimit());

    require(amount > 0, "!amount");
    return amount;
  }

  function _updateLockedProfit(
    uint256 _gain,
    uint256 _totalFees,
    uint256 _loss
  ) internal {
    // Profit is locked and gradually released per block
    // NOTE: compute current locked profit and replace with sum of current and new
    uint256 locakedProfileBeforeLoss = _calculateLockedProfit() + _gain - _totalFees;
    if (locakedProfileBeforeLoss > _loss) {
      lockedProfit = locakedProfileBeforeLoss - _loss;
    } else {
      lockedProfit = 0;
    }
  }

  // solhint-disable-next-line no-unused-vars
  function _authorizeUpgrade(address) internal view override {
    _onlyGovernance();
  }
}

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

interface IStaking {
  function totalWorkingSupply() external view returns (uint256);

  function workingBalanceOf(address _user) external view returns (uint256);
}

interface IStakingV2 {
  function stakeForUser(
    uint248 _amount,
    uint8 _lockPeriod,
    address _to
  ) external returns (uint256);

  function stakeAndBoostForUser(
    uint248 _amount,
    uint8 _lockPeriod,
    address _to,
    address[] calldata _vaultsToBoost
  ) external returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.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 SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20Upgradeable 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(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20Upgradeable 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(
        IERC20Upgradeable 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(IERC20Upgradeable 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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

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

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

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

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

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ReentrancyGuardUpgradeable is Initializable {
    // 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;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // 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;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/utils/Initializable.sol)

pragma solidity ^0.8.0;

import "../../utils/AddressUpgradeable.sol";

/**
 * @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.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
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() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/utils/UUPSUpgradeable.sol)

pragma solidity ^0.8.0;

import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
        __ERC1967Upgrade_init_unchained();
        __UUPSUpgradeable_init_unchained();
    }

    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

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

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

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

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

interface IHealthCheck {
  function check(
    address callerStrategy,
    uint256 profit,
    uint256 loss,
    uint256 debtPayment,
    uint256 debtOutstanding,
    uint256 totalDebt
  ) external view returns (bool);

  function doHealthCheck(address _strategy) external view returns (bool);

  function enableCheck(address _strategy) external;
}

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

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IStrategy {
  // *** Events *** //
  event Harvested(uint256 _profit, uint256 _loss, uint256 _debtPayment, uint256 _debtOutstanding);
  event StrategistUpdated(address _newStrategist);
  event KeeperUpdated(address _newKeeper);
  event MinReportDelayUpdated(uint256 _delay);
  event MaxReportDelayUpdated(uint256 _delay);
  event ProfitFactorUpdated(uint256 _profitFactor);
  event DebtThresholdUpdated(uint256 _debtThreshold);
  event EmergencyExitEnabled();

  // *** The following functions are used by the Vault *** //
  /// @notice returns the address of the token that the strategy wants
  function want() external view returns (IERC20);

  /// @notice the address of the Vault that the strategy belongs to
  function vault() external view returns (address);

  /// @notice if the strategy is active
  function isActive() external view returns (bool);

  /// @notice migrate the strategy to the new one
  function migrate(address _newStrategy) external;

  /// @notice withdraw the amount from the strategy
  function withdraw(uint256 _amount) external returns (uint256);

  /// @notice the amount of total assets managed by this strategy that should not account towards the TVL of the strategy
  function delegatedAssets() external view returns (uint256);

  /// @notice the total assets that the strategy is managing
  function estimatedTotalAssets() external view returns (uint256);

  // *** public read functions that can be called by anyone *** //
  function name() external view returns (string memory);

  function harvester() external view returns (address);

  function strategyProposer() external view returns (address);

  function strategyDeveloper() external view returns (address);

  function tendTrigger(uint256 _callCost) external view returns (bool);

  function harvestTrigger(uint256 _callCost) external view returns (bool);

  // *** write functions that can be called by the governance, the strategist or the keeper *** //
  function tend() external;

  function harvest() external;

  // *** write functions that can be called by the governance or the strategist ***//

  function setHarvester(address _havester) external;

  function setVault(address _vault) external;

  /// @notice `minReportDelay` is the minimum number of blocks that should pass for `harvest()` to be called.
  function setMinReportDelay(uint256 _delay) external;

  function setMaxReportDelay(uint256 _delay) external;

  /// @notice `profitFactor` is used to determine if it's worthwhile to harvest, given gas costs.
  function setProfitFactor(uint256 _profitFactor) external;

  /// @notice Sets how far the Strategy can go into loss without a harvest and report being required.
  function setDebtThreshold(uint256 _debtThreshold) external;

  // *** write functions that can be called by the governance, or the strategist, or the guardian, or the management *** //
  function setEmergencyExit() external;
}

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

interface IAccessControlManager {
  function hasAccess(address _user, address _vault) external view returns (bool);
}

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

interface IFeeCollection {
  function collectManageFee(uint256 _amount) external;

  function collectPerformanceFee(address _strategy, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;

import "@openzeppelin/contracts/utils/math/Math.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import "./BaseVault.sol";
import "../libraries/VaultUtils.sol";

///  @dev NOTE: do not add any new state variables to this contract. If needed, see {VaultDataStorage.sol} instead.
abstract contract SingleAssetVaultBase is BaseVault {
  using SafeERC20Upgradeable for IERC20Upgradeable;

  // solhint-disable-next-line no-empty-blocks
  constructor() {}

  // solhint-disable-next-line func-name-mixedcase
  function __SingleAssetVaultBase_init_unchained(address _token) internal {
    require(_token != address(0), "!token");
    token = IERC20Upgradeable(_token);
    // the vault decimals need to match the tokens to avoid any conversion
    vaultDecimals = ERC20Upgradeable(address(token)).decimals();
  }

  // solhint-disable-next-line func-name-mixedcase
  function __SingleAssetVaultBase_init(
    string memory _name,
    string memory _symbol,
    address _governance,
    address _gatekeeper,
    address _feeCollection,
    address _strategyDataStoreAddress,
    address _token,
    address _accessManager,
    address _vaultRewards
  ) internal {
    __BaseVault__init(
      _name,
      _symbol,
      _governance,
      _gatekeeper,
      _feeCollection,
      _strategyDataStoreAddress,
      _accessManager,
      _vaultRewards
    );
    __SingleAssetVaultBase_init_unchained(_token);
  }

  /// @notice Returns the total quantity of all assets under control of this
  ///   Vault, whether they're loaned out to a Strategy, or currently held in
  ///   the Vault.
  /// @return The total assets under control of this Vault.
  function totalAsset() external view returns (uint256) {
    return _totalAsset();
  }

  /// @notice the remaining amount of underlying tokens that still can be deposited into the vault before reaching the limit
  function availableDepositLimit() external view returns (uint256) {
    return _availableDepositLimit();
  }

  /// @notice Determines the maximum quantity of shares this Vault can facilitate a
  ///  withdrawal for, factoring in assets currently residing in the Vault,
  ///  as well as those deployed to strategies on the Vault's balance sheet.
  /// @dev Regarding how shares are calculated, see dev note on `deposit`.
  ///  If you want to calculated the maximum a user could withdraw up to,
  ///  you want to use this function.
  /// Note that the amount provided by this function is the theoretical
  ///  maximum possible from withdrawing, the real amount depends on the
  ///  realized losses incurred during withdrawal.
  /// @return The total quantity of shares this Vault can provide.
  function maxAvailableShares() external view returns (uint256) {
    return _maxAvailableShares();
  }

  /// @notice Gives the price for a single Vault share.
  /// @dev See dev note on `withdraw`.
  /// @return The value of a single share.
  function pricePerShare() external view returns (uint256) {
    return _shareValue(10**vaultDecimals);
  }

  /// @notice Determines if `_strategy` is past its debt limit and if any tokens
  ///  should be withdrawn to the Vault.
  /// @param _strategy The Strategy to check.
  /// @return The quantity of tokens to withdraw.
  function debtOutstanding(address _strategy) external view returns (uint256) {
    return _debtOutstanding(_strategy);
  }

  /// @notice Amount of tokens in Vault a Strategy has access to as a credit line.
  ///  This will check the Strategy's debt limit, as well as the tokens
  ///  available in the Vault, and determine the maximum amount of tokens
  ///  (if any) the Strategy may draw on.
  /// In the rare case the Vault is in emergency shutdown this will return 0.
  /// @param _strategy The Strategy to check.
  /// @return The quantity of tokens available for the Strategy to draw on.
  function creditAvailable(address _strategy) external view returns (uint256) {
    return _creditAvailable(_strategy);
  }

  /// @notice Provide an accurate expected value for the return this `strategy`
  /// would provide to the Vault the next time `report()` is called
  /// (since the last time it was called).
  /// @param _strategy The Strategy to determine the expected return for.
  /// @return The anticipated amount `strategy` should make on its investment since its last report.
  function expectedReturn(address _strategy) external view returns (uint256) {
    return _expectedReturn(_strategy);
  }

  /// @notice send the tokens that are not managed by the vault to the governance
  /// @param _token the token to send
  /// @param _amount the amount of tokens to send
  function sweep(address _token, uint256 _amount) external {
    _onlyGovernance();
    require(address(token) != _token, "!token");
    _sweep(_token, _amount, governance);
  }

  function _totalAsset() internal view returns (uint256) {
    return token.balanceOf(address(this)) + totalDebt;
  }

  function _availableDepositLimit() internal view returns (uint256) {
    return depositLimit > _totalAsset() ? depositLimit - _totalAsset() : 0;
  }

  function _shareValue(uint256 _sharesAmount) internal view returns (uint256) {
    uint256 supply = totalSupply();
    // if the value is empty then the price is 1:1
    return supply == 0 ? _sharesAmount : (_sharesAmount * _freeFunds()) / supply;
  }

  function _calculateLockedProfit() internal view returns (uint256) {
    // solhint-disable-next-line not-rely-on-time
    uint256 lockedFundRatio = (block.timestamp - lastReport) * lockedProfitDegradation;
    return
      lockedFundRatio < DEGRADATION_COEFFICIENT
        ? lockedProfit - (lockedFundRatio * lockedProfit) / DEGRADATION_COEFFICIENT
        : 0;
  }

  function _freeFunds() internal view returns (uint256) {
    return _totalAsset() - _calculateLockedProfit();
  }

  function _sharesForAmount(uint256 _amount) internal view returns (uint256) {
    uint256 freeFunds_ = _freeFunds();
    return freeFunds_ > 0 ? (_amount * totalSupply()) / freeFunds_ : 0;
  }

  function _maxAvailableShares() internal view returns (uint256) {
    uint256 shares_ = _sharesForAmount(token.balanceOf(address(this)));
    address[] memory withdrawQueue = _strategyDataStore().withdrawQueue(address(this));
    for (uint256 i = 0; i < withdrawQueue.length; i++) {
      shares_ = shares_ + _sharesForAmount(strategies[withdrawQueue[i]].totalDebt);
    }
    return shares_;
  }

  function _debtOutstanding(address _strategy) internal view returns (uint256) {
    _validateStrategy(_strategy);
    return VaultUtils.debtOutstanding(emergencyShutdown, _totalAsset(), _strategyDataStore(), strategies, _strategy);
  }

  function _creditAvailable(address _strategy) internal view returns (uint256) {
    if (emergencyShutdown) {
      return 0;
    }
    _validateStrategy(_strategy);
    return VaultUtils.creditAvailable(token, _totalAsset(), totalDebt, _strategyDataStore(), strategies, _strategy);
  }

  function _expectedReturn(address _strategy) internal view returns (uint256) {
    _validateStrategy(_strategy);
    return VaultUtils.expectedReturn(strategies, _strategy);
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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;
        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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeaconUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
        __ERC1967Upgrade_init_unchained();
    }

    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        address oldImplementation = _getImplementation();

        // Initial upgrade and setup call
        _setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(newImplementation, data);
        }

        // Perform rollback test if not already in progress
        StorageSlotUpgradeable.BooleanSlot storage rollbackTesting = StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            _functionDelegateCall(
                newImplementation,
                abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }

    /**
     * @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) private returns (bytes memory) {
        require(AddressUpgradeable.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 AddressUpgradeable.verifyCallResult(success, returndata, "Address: low-level delegate call failed");
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/StorageSlot.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    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}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `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");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

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

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

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `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");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(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:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

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

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

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

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

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

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

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

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

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

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;

import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-ERC20PermitUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "../interfaces/IStrategy.sol";
import "../interfaces/IVaultStrategyDataStore.sol";
import "../interfaces/IYOPRewards.sol";
import "./VaultMetaDataStore.sol";

import "../interfaces/IVault.sol";

/// @dev This contract is marked abstract to avoid being used directly.
///  NOTE: do not add any new state variables to this contract. If needed, see {VaultDataStorage.sol} instead.
abstract contract BaseVault is ERC20PermitUpgradeable, VaultMetaDataStore {
  using SafeERC20Upgradeable for IERC20Upgradeable;

  event StrategyAdded(address indexed _strategy);
  event StrategyMigrated(address indexed _oldVersion, address indexed _newVersion);
  event StrategyRevoked(address indexed _strategy);

  // solhint-disable-next-line no-empty-blocks
  constructor() {}

  // solhint-disable-next-line
  function __BaseVault__init_unchained() internal {}

  // solhint-disable-next-line func-name-mixedcase
  function __BaseVault__init(
    string memory _name,
    string memory _symbol,
    address _governance,
    address _gatekeeper,
    address _feeCollection,
    address _strategyDataStoreAddress,
    address _accessManager,
    address _vaultRewards
  ) internal {
    __ERC20_init(_name, _symbol);
    __ERC20Permit_init(_name);
    __VaultMetaDataStore_init(
      _governance,
      _gatekeeper,
      _feeCollection,
      _strategyDataStoreAddress,
      _accessManager,
      _vaultRewards
    );
    __BaseVault__init_unchained();
  }

  /// @notice returns decimals value of the vault
  function decimals() public view override returns (uint8) {
    return vaultDecimals;
  }

  /// @notice Init a new strategy. This should only be called by the {VaultStrategyDataStore} and should not be invoked manually.
  ///   Use {VaultStrategyDataStore.addStrategy} to manually add a strategy to a Vault.
  /// @dev This will be called by the {VaultStrategyDataStore} when a strategy is added to a given Vault.
  function addStrategy(address _strategy) external virtual returns (bool) {
    _onlyNotEmergencyShutdown();
    _onlyStrategyDataStore();
    return _addStrategy(_strategy);
  }

  /// @notice Migrate a new strategy. This should only be called by the {VaultStrategyDataStore} and should not be invoked manually.
  ///   Use {VaultStrategyDataStore.migrateStrategy} to manually migrate a strategy for a Vault.
  /// @dev This will called be the {VaultStrategyDataStore} when a strategy is migrated.
  ///  This will then call the strategy to migrate (as the strategy only allows the vault to call the migrate function).
  function migrateStrategy(address _oldVersion, address _newVersion) external virtual returns (bool) {
    _onlyStrategyDataStore();
    return _migrateStrategy(_oldVersion, _newVersion);
  }

  /// @notice called by the strategy to revoke itself. Should not be called by any other means.
  ///  Use {VaultStrategyDataStore.revokeStrategy} to revoke a strategy manually.
  /// @dev The strategy could talk to the {VaultStrategyDataStore} directly when revoking itself.
  ///  However, that means we will need to change the interfaces to Strategies and make them incompatible with Yearn's strategies.
  ///  To avoid that, the strategies will continue talking to the Vault and the Vault will then let the {VaultStrategyDataStore} know.
  function revokeStrategy() external {
    _validateStrategy(_msgSender());
    _strategyDataStore().revokeStrategyByStrategy(_msgSender());
    emit StrategyRevoked(_msgSender());
  }

  function strategy(address _strategy) external view returns (StrategyInfo memory) {
    return strategies[_strategy];
  }

  function strategyDebtRatio(address _strategy) external view returns (uint256) {
    return _strategyDataStore().strategyDebtRatio(address(this), _strategy);
  }

  /// @dev It doesn't inherit openzepplin's ERC165 implementation to save on contract size
  ///  but it is compatible with ERC165
  function supportsInterface(bytes4 _interfaceId) external view virtual returns (bool) {
    // 0x01ffc9a7 is the interfaceId of IERC165 itself
    return _interfaceId == type(IVault).interfaceId || _interfaceId == 0x01ffc9a7;
  }

  /// @dev This is called when tokens are minted, transferred or burned by the ERC20 implementation from openzeppelin
  // solhint-disable-next-line no-unused-vars
  function _beforeTokenTransfer(
    address _from,
    address _to,
    uint256
  ) internal override {
    if (_from == address(0)) {
      // this is a mint event, track block time for the account
      dt[_to] = block.number;
    } else {
      // this is a transfer or burn event, make sure it is at least 1 block later from deposit to prevent flash loan
      // this will cause a small issue that if a user minted some tokens before, and then mint some more and withdraw (burn) or transfer previously minted tokens in the same block, this will fail.
      // But it should not be a issue for majority of users and it does prevent flash loan
      require(block.number > dt[_from], "!block");
    }
    if (vaultRewards != address(0)) {
      if (_from != address(0)) {
        IYOPRewards(vaultRewards).calculateVaultRewards(_from);
      }
      if (_to != address(0)) {
        IYOPRewards(vaultRewards).calculateVaultRewards(_to);
      }
    }
  }

  function _strategyDataStore() internal view returns (IVaultStrategyDataStore) {
    return IVaultStrategyDataStore(strategyDataStore);
  }

  function _onlyStrategyDataStore() internal view {
    require(_msgSender() == strategyDataStore, "!strategyStore");
  }

  /// @dev ensure the vault is not in emergency shutdown mode
  function _onlyNotEmergencyShutdown() internal view {
    require(emergencyShutdown == false, "emergency shutdown");
  }

  function _validateStrategy(address _strategy) internal view {
    require(strategies[_strategy].activation > 0, "!strategy");
  }

  function _addStrategy(address _strategy) internal returns (bool) {
    /* solhint-disable not-rely-on-time */
    strategies[_strategy] = StrategyInfo({
      activation: block.timestamp,
      lastReport: block.timestamp,
      totalDebt: 0,
      totalGain: 0,
      totalLoss: 0
    });
    emit StrategyAdded(_strategy);
    return true;
    /* solhint-enable */
  }

  function _migrateStrategy(address _oldVersion, address _newVersion) internal returns (bool) {
    StrategyInfo memory info = strategies[_oldVersion];
    strategies[_oldVersion].totalDebt = 0;
    strategies[_newVersion] = StrategyInfo({
      activation: info.activation,
      lastReport: info.lastReport,
      totalDebt: info.totalDebt,
      totalGain: 0,
      totalLoss: 0
    });
    IStrategy(_oldVersion).migrate(_newVersion);
    emit StrategyMigrated(_oldVersion, _newVersion);
    return true;
  }

  function _sweep(
    address _token,
    uint256 _amount,
    address _to
  ) internal {
    IERC20Upgradeable token_ = IERC20Upgradeable(_token);
    _amount = Math.min(_amount, token_.balanceOf(address(this)));
    token_.safeTransfer(_to, _amount);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "../interfaces/IStaking.sol";
import "../interfaces/IVault.sol";
import "../interfaces/IHealthCheck.sol";
import "../interfaces/IStrategy.sol";
import "../interfaces/IFeeCollection.sol";
import "../interfaces/IVaultStrategyDataStore.sol";

///@dev This library will include some of the stateless functions used by the SingleAssetVault
/// The main reason to put these function in the library is to reduce the size of the main contract
library VaultUtils {
  uint256 internal constant SECONDS_PER_YEAR = 31_556_952; // 365.2425 days
  uint256 internal constant MAX_BASIS_POINTS = 10_000;

  function calculateBoostedVaultBalance(
    address _user,
    address _stakingContract,
    address _vaultContract,
    uint128 _vaultBalanceWeight,
    uint128 _stakingBalanceWeight
  ) external view returns (uint256) {
    uint256 stakingPoolSize = IStaking(_stakingContract).workingBalanceOf(_user);
    uint256 totalStakingSize = IStaking(_stakingContract).totalWorkingSupply();
    uint256 userVaultBalance = IVault(_vaultContract).balanceOf(_user);
    uint256 totalVaultSize = IVault(_vaultContract).totalSupply();
    uint128 totalWeight = _vaultBalanceWeight + _stakingBalanceWeight;
    // boostedBalance = min(1 * userVaultBalance + 9 * stakingPoolSize/totalStakingSize*totalVaultSize, 10 * userVaultBalance);
    return
      Math.min(
        _vaultBalanceWeight *
          userVaultBalance +
          (totalStakingSize == 0 ? 0 : ((_stakingBalanceWeight * stakingPoolSize * totalVaultSize) / totalStakingSize)),
        totalWeight * userVaultBalance
      );
  }

  function checkStrategyHealth(
    address _healthCheck,
    address _strategy,
    uint256 _gain,
    uint256 _loss,
    uint256 _debtPayment,
    uint256 _debtOutstanding,
    uint256 _totalDebt
  ) external {
    if (_healthCheck != address(0)) {
      IHealthCheck check = IHealthCheck(_healthCheck);
      if (check.doHealthCheck(_strategy)) {
        require(check.check(_strategy, _gain, _loss, _debtPayment, _debtOutstanding, _totalDebt), "!healthy");
      } else {
        check.enableCheck(_strategy);
      }
    }
  }

  function assessManagementFee(
    uint256 _lastReport,
    uint256 _totalDebt,
    uint256 _delegateAssets,
    uint256 _managementFee
  ) public view returns (uint256) {
    // solhint-disable-next-line not-rely-on-time
    uint256 duration = block.timestamp - _lastReport;
    require(duration > 0, "!block"); // should not be called twice within the same block
    // the managementFee is per year, so only charge the management fee for the period since last time it is charged.
    if (_managementFee > 0) {
      uint256 strategyTVL = _totalDebt - _delegateAssets;
      return (strategyTVL * _managementFee * duration) / SECONDS_PER_YEAR / MAX_BASIS_POINTS;
    }
    return 0;
  }

  function assessStrategyPerformanceFee(uint256 _performanceFee, uint256 _gain) public pure returns (uint256) {
    return (_gain * _performanceFee) / MAX_BASIS_POINTS;
  }

  function calculateFees(
    mapping(address => StrategyInfo) storage _strategies,
    address _strategy,
    uint256 _gain,
    uint256 _managementFee,
    uint256 _performanceFee
  ) public view returns (uint256 totalFee, uint256 performanceFee) {
    // Issue new shares to cover fees
    // solhint-disable-next-line not-rely-on-time
    if (_strategies[_strategy].activation == block.timestamp) {
      return (0, 0); // NOTE: Just added, no fees to assess
    }
    if (_gain == 0) {
      // The fees are not charged if there hasn't been any gains reported
      return (0, 0);
    }
    uint256 managementFee_ = assessManagementFee(
      _strategies[_strategy].lastReport,
      _strategies[_strategy].totalDebt,
      IStrategy(_strategy).delegatedAssets(),
      _managementFee
    );
    uint256 strategyPerformanceFee_ = assessStrategyPerformanceFee(_performanceFee, _gain);
    uint256 totalFee_ = Math.min(_gain, managementFee_ + strategyPerformanceFee_);
    return (totalFee_, strategyPerformanceFee_);
  }

  function assessFees(
    IERC20Upgradeable _token,
    address _feeCollection,
    mapping(address => StrategyInfo) storage _strategies,
    address _strategy,
    uint256 _gain,
    uint256 _managementFee,
    uint256 _performanceFee
  ) external returns (uint256) {
    uint256 totalFee_;
    uint256 performanceFee_;
    (totalFee_, performanceFee_) = calculateFees(_strategies, _strategy, _gain, _managementFee, _performanceFee);

    if (totalFee_ > 0) {
      _token.approve(_feeCollection, totalFee_);
      uint256 managementFee_ = totalFee_ - performanceFee_;
      if (managementFee_ > 0) {
        IFeeCollection(_feeCollection).collectManageFee(managementFee_);
      }
      if (performanceFee_ > 0) {
        IFeeCollection(_feeCollection).collectPerformanceFee(_strategy, performanceFee_);
      }
    }
    return totalFee_;
  }

  function reportLoss(
    mapping(address => StrategyInfo) storage _strategies,
    address _strategy,
    uint256 _totalDebt,
    IVaultStrategyDataStore _strategyDataStore,
    uint256 _loss
  ) public returns (uint256) {
    if (_loss > 0) {
      require(_strategies[_strategy].totalDebt >= _loss, "!loss");
      uint256 tRatio_ = _strategyDataStore.vaultTotalDebtRatio(address(this));
      uint256 straRatio_ = _strategyDataStore.strategyDebtRatio(address(this), _strategy);
      // make sure we reduce our trust with the strategy by the amount of loss
      if (tRatio_ != 0) {
        uint256 c = Math.min((_loss * tRatio_) / _totalDebt, straRatio_);
        _strategyDataStore.updateStrategyDebtRatio(address(this), _strategy, straRatio_ - c);
      }
      _strategies[_strategy].totalLoss = _strategies[_strategy].totalLoss + _loss;
      _strategies[_strategy].totalDebt = _strategies[_strategy].totalDebt - _loss;
      _totalDebt = _totalDebt - _loss;
    }
    return _totalDebt;
  }

  function creditAvailable(
    IERC20Upgradeable _token,
    uint256 _totalAsset,
    uint256 _totalDebt,
    IVaultStrategyDataStore _strategyDataStore,
    mapping(address => StrategyInfo) storage _strategies,
    address _strategy
  ) external view returns (uint256) {
    uint256 vaultTotalDebtLimit_ = (_totalAsset * _strategyDataStore.vaultTotalDebtRatio(address(this))) /
      MAX_BASIS_POINTS;

    uint256 strategyDebtLimit_ = (_totalAsset * _strategyDataStore.strategyDebtRatio(address(this), _strategy)) /
      MAX_BASIS_POINTS;
    uint256 strategyTotalDebt_ = _strategies[_strategy].totalDebt;
    uint256 strategyMinDebtPerHarvest_ = _strategyDataStore.strategyMinDebtPerHarvest(address(this), _strategy);
    uint256 strategyMaxDebtPerHarvest_ = _strategyDataStore.strategyMaxDebtPerHarvest(address(this), _strategy);

    if ((strategyDebtLimit_ <= strategyTotalDebt_) || (vaultTotalDebtLimit_ <= _totalDebt)) {
      return 0;
    }

    uint256 available_ = strategyDebtLimit_ - strategyTotalDebt_;
    available_ = Math.min(available_, vaultTotalDebtLimit_ - _totalDebt);
    available_ = Math.min(available_, _token.balanceOf(address(this)));

    return available_ < strategyMinDebtPerHarvest_ ? 0 : Math.min(available_, strategyMaxDebtPerHarvest_);
  }

  function debtOutstanding(
    bool _emergencyShutdown,
    uint256 _totalAsset,
    IVaultStrategyDataStore _strategyDataStore,
    mapping(address => StrategyInfo) storage _strategies,
    address _strategy
  ) external view returns (uint256) {
    if (_strategyDataStore.vaultTotalDebtRatio(address(this)) == 0) {
      return _strategies[_strategy].totalDebt;
    }
    uint256 strategyLimit_ = (_totalAsset * _strategyDataStore.strategyDebtRatio(address(this), _strategy)) /
      MAX_BASIS_POINTS;
    uint256 strategyTotalDebt_ = _strategies[_strategy].totalDebt;

    if (_emergencyShutdown) {
      return strategyTotalDebt_;
    } else if (strategyTotalDebt_ <= strategyLimit_) {
      return 0;
    } else {
      return strategyTotalDebt_ - strategyLimit_;
    }
  }

  function expectedReturn(mapping(address => StrategyInfo) storage _strategies, address _strategy)
    external
    view
    returns (uint256)
  {
    uint256 strategyLastReport_ = _strategies[_strategy].lastReport;
    // solhint-disable-next-line not-rely-on-time
    uint256 sinceLastHarvest_ = block.timestamp - strategyLastReport_;
    uint256 totalHarvestTime_ = strategyLastReport_ - _strategies[_strategy].activation;

    // NOTE: If either `sinceLastHarvest_` or `totalHarvestTime_` is 0, we can short-circuit to `0`
    if ((sinceLastHarvest_ > 0) && (totalHarvestTime_ > 0) && (IStrategy(_strategy).isActive())) {
      // # NOTE: Unlikely to throw unless strategy accumalates >1e68 returns
      // # NOTE: Calculate average over period of time where harvests have occured in the past
      return (_strategies[_strategy].totalGain * sinceLastHarvest_) / totalHarvestTime_;
    } else {
      return 0;
    }
  }
}

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

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-ERC20Permit.sol)

pragma solidity ^0.8.0;

import "./draft-IERC20PermitUpgradeable.sol";
import "../ERC20Upgradeable.sol";
import "../../../utils/cryptography/draft-EIP712Upgradeable.sol";
import "../../../utils/cryptography/ECDSAUpgradeable.sol";
import "../../../utils/CountersUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20PermitUpgradeable is Initializable, ERC20Upgradeable, IERC20PermitUpgradeable, EIP712Upgradeable {
    using CountersUpgradeable for CountersUpgradeable.Counter;

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

    // solhint-disable-next-line var-name-mixedcase
    bytes32 private _PERMIT_TYPEHASH;

    /**
     * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
     *
     * It's a good idea to use the same `name` that is defined as the ERC20 token name.
     */
    function __ERC20Permit_init(string memory name) internal onlyInitializing {
        __Context_init_unchained();
        __EIP712_init_unchained(name, "1");
        __ERC20Permit_init_unchained(name);
    }

    function __ERC20Permit_init_unchained(string memory name) internal onlyInitializing {
        _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");}

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

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

        bytes32 hash = _hashTypedDataV4(structHash);

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

        _approve(owner, spender, value);
    }

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

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

    /**
     * @dev "Consume a nonce": return the current value and increment.
     *
     * _Available since v4.1._
     */
    function _useNonce(address owner) internal virtual returns (uint256 current) {
        CountersUpgradeable.Counter storage nonce = _nonces[owner];
        current = nonce.current();
        nonce.increment();
    }
    uint256[49] private __gap;
}

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

interface IVaultStrategyDataStore {
  function strategyPerformanceFee(address _vault, address _strategy) external view returns (uint256);

  function strategyActivation(address _vault, address _strategy) external view returns (uint256);

  function strategyDebtRatio(address _vault, address _strategy) external view returns (uint256);

  function strategyMinDebtPerHarvest(address _vault, address _strategy) external view returns (uint256);

  function strategyMaxDebtPerHarvest(address _vault, address _strategy) external view returns (uint256);

  function vaultStrategies(address _vault) external view returns (address[] memory);

  function vaultTotalDebtRatio(address _vault) external view returns (uint256);

  function withdrawQueue(address _vault) external view returns (address[] memory);

  function revokeStrategyByStrategy(address _strategy) external;

  function setVaultManager(address _vault, address _manager) external;

  function setMaxTotalDebtRatio(address _vault, uint256 _maxTotalDebtRatio) external;

  function addStrategy(
    address _vault,
    address _strategy,
    uint256 _debtRatio,
    uint256 _minDebtPerHarvest,
    uint256 _maxDebtPerHarvest,
    uint256 _performanceFee
  ) external;

  function updateStrategyPerformanceFee(
    address _vault,
    address _strategy,
    uint256 _performanceFee
  ) external;

  function updateStrategyDebtRatio(
    address _vault,
    address _strategy,
    uint256 _debtRatio
  ) external;

  function updateStrategyMinDebtHarvest(
    address _vault,
    address _strategy,
    uint256 _minDebtPerHarvest
  ) external;

  function updateStrategyMaxDebtHarvest(
    address _vault,
    address _strategy,
    uint256 _maxDebtPerHarvest
  ) external;

  function migrateStrategy(
    address _vault,
    address _oldStrategy,
    address _newStrategy
  ) external;

  function revokeStrategy(address _vault, address _strategy) external;

  function setWithdrawQueue(address _vault, address[] calldata _queue) external;

  function addStrategyToWithdrawQueue(address _vault, address _strategy) external;

  function removeStrategyFromWithdrawQueue(address _vault, address _strategy) external;
}

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

interface IYOPRewards {
  /// @notice Returns the current emission rate (per epoch) for vault rewards and the current number of epoch (start from 1).
  function rate() external view returns (uint256 _rate, uint256 _epoch);

  /// @notice Returns the current ratio of community emissions for vault users
  function vaultsRewardsWeight() external view returns (uint256);

  /// @notice Returns the current ratio of community emissions for staking users
  function stakingRewardsWeight() external view returns (uint256);

  /// @notice Set the ratios of community emission for vaults and staking respectively. Governance only. Should emit an event.
  function setRewardsAllocationWeights(uint256 _weightForVaults, uint256 _weightForStaking) external;

  /// @notice Get the weight of a Vault
  function perVaultRewardsWeight(address vault) external view returns (uint256);

  /// @notice Set the weights for vaults. Governance only. Should emit events.
  function setPerVaultRewardsWeight(address[] calldata vaults, uint256[] calldata weights) external;

  /// @notice Calculate the rewards for the given user in the given vault. Vaults Only.
  /// This should be called by every Vault every time a user deposits or withdraws.
  function calculateVaultRewards(address _user) external;

  /// @notice Calculate the rewards for the given stake id in the staking contract.
  function calculateStakingRewards(uint256 _stakeId) external;

  /// @notice Allow a user to claim the accrued rewards from both vaults and staking, and transfer the YOP tokens to the given account.
  function claimAll(address _to) external;

  /// @notice Calculate the unclaimed rewards for the calling user
  function allUnclaimedRewards(address _user)
    external
    view
    returns (
      uint256 totalRewards,
      uint256 vaultsRewards,
      uint256 stakingRewards
    );
}

interface IYOPRewardsV2 {
  function claimRewardsForStakes(uint256[] calldata _stakeIds) external returns (uint256, uint256[] memory);

  function claimVaultRewardsForUsers(address[] calldata _users) external returns (uint256, uint256[] memory);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;

import "./roles/Governable.sol";
import "./roles/Gatekeeperable.sol";
import "./VaultDataStorage.sol";

///  @dev NOTE: do not add any new state variables to this contract. If needed, see {VaultDataStorage.sol} instead.
abstract contract VaultMetaDataStore is GovernableUpgradeable, Gatekeeperable, VaultDataStorage {
  event EmergencyShutdown(bool _active);
  event HealthCheckUpdated(address indexed _healthCheck);
  event FeeCollectionUpdated(address indexed _feeCollection);
  event ManagementFeeUpdated(uint256 _managementFee);
  event StrategyDataStoreUpdated(address indexed _strategyDataStore);
  event DepositLimitUpdated(uint256 _limit);
  event LockedProfitDegradationUpdated(uint256 _degradation);
  event AccessManagerUpdated(address indexed _accessManager);
  event VaultRewardsContractUpdated(address indexed _vaultRewards);

  /// @notice The maximum basis points. 1 basis point is 0.01% and 100% is 10000 basis points
  uint256 internal constant MAX_BASIS_POINTS = 10_000;

  // solhint-disable-next-line no-empty-blocks
  constructor() {}

  // solhint-disable-next-line func-name-mixedcase
  function __VaultMetaDataStore_init(
    address _governance,
    address _gatekeeper,
    address _feeCollection,
    address _strategyDataStore,
    address _accessManager,
    address _vaultRewards
  ) internal {
    __Governable_init(_governance);
    __Gatekeeperable_init(_gatekeeper);
    __VaultDataStorage_init();
    __VaultMetaDataStore_init_unchained(_feeCollection, _strategyDataStore, _accessManager, _vaultRewards);
  }

  // solhint-disable-next-line func-name-mixedcase
  function __VaultMetaDataStore_init_unchained(
    address _feeCollection,
    address _strategyDataStore,
    address _accessManager,
    address _vaultRewards
  ) internal {
    _updateFeeCollection(_feeCollection);
    _updateStrategyDataStore(_strategyDataStore);
    _updateAccessManager(_accessManager);
    _updateVaultRewardsContract(_vaultRewards);
  }

  /// @notice set the address to send the collected fees to. Only can be called by the governance.
  /// @param _feeCollection the new address to send the fees to.
  function setFeeCollection(address _feeCollection) external {
    _onlyGovernance();
    _updateFeeCollection(_feeCollection);
  }

  /// @notice set the management fee in basis points. 1 basis point is 0.01% and 100% is 10000 basis points.
  function setManagementFee(uint256 _managementFee) external {
    _onlyGovernance();
    _updateManagementFee(_managementFee);
  }

  function setGatekeeper(address _gatekeeper) external {
    _onlyGovernance();
    _updateGatekeeper(_gatekeeper);
  }

  function setHealthCheck(address _healthCheck) external {
    _onlyGovernanceOrGatekeeper(governance);
    _updateHealthCheck(_healthCheck);
  }

  /// @notice Activates or deactivates Vault mode where all Strategies go into full withdrawal.
  /// During Emergency Shutdown:
  /// 1. No Users may deposit into the Vault (but may withdraw as usual.)
  /// 2. Governance may not add new Strategies.
  /// 3. Each Strategy must pay back their debt as quickly as reasonable to minimally affect their position.
  /// 4. Only Governance may undo Emergency Shutdown.
  ///
  /// See contract level note for further details.
  ///
  /// This may only be called by governance or the guardian.
  /// @param _active If true, the Vault goes into Emergency Shutdown. If false, the Vault goes back into Normal Operation.
  function setVaultEmergencyShutdown(bool _active) external {
    if (_active) {
      _onlyGovernanceOrGatekeeper(governance);
    } else {
      _onlyGovernance();
    }
    if (emergencyShutdown != _active) {
      emergencyShutdown = _active;
      emit EmergencyShutdown(_active);
    }
  }

  /// @notice Changes the locked profit degradation.
  /// @param _degradation The rate of degradation in percent per second scaled to 1e18.
  function setLockedProfileDegradation(uint256 _degradation) external {
    _onlyGovernance();
    require(_degradation <= DEGRADATION_COEFFICIENT, "!value");
    if (lockedProfitDegradation != _degradation) {
      lockedProfitDegradation = _degradation;
      emit LockedProfitDegradationUpdated(_degradation);
    }
  }

  function setVaultCreator(address _creator) external {
    _onlyGovernanceOrGatekeeper(governance);
    creator = _creator;
  }

  function setDepositLimit(uint256 _limit) external {
    _onlyGovernanceOrGatekeeper(governance);
    _updateDepositLimit(_limit);
  }

  function setAccessManager(address _accessManager) external {
    _onlyGovernanceOrGatekeeper(governance);
    _updateAccessManager(_accessManager);
  }

  function _updateFeeCollection(address _feeCollection) internal {
    require(_feeCollection != address(0), "!input");
    if (feeCollection != _feeCollection) {
      feeCollection = _feeCollection;
      emit FeeCollectionUpdated(_feeCollection);
    }
  }

  function _updateManagementFee(uint256 _managementFee) internal {
    require(_managementFee < MAX_BASIS_POINTS, "!input");
    if (managementFee != _managementFee) {
      managementFee = _managementFee;
      emit ManagementFeeUpdated(_managementFee);
    }
  }

  function _updateHealthCheck(address _healthCheck) internal {
    if (healthCheck != _healthCheck) {
      healthCheck = _healthCheck;
      emit HealthCheckUpdated(_healthCheck);
    }
  }

  function _updateStrategyDataStore(address _strategyDataStore) internal {
    require(_strategyDataStore != address(0), "!input");
    if (strategyDataStore != _strategyDataStore) {
      strategyDataStore = _strategyDataStore;
      emit StrategyDataStoreUpdated(_strategyDataStore);
    }
  }

  function _updateDepositLimit(uint256 _depositLimit) internal {
    if (depositLimit != _depositLimit) {
      depositLimit = _depositLimit;
      emit DepositLimitUpdated(_depositLimit);
    }
  }

  function _updateAccessManager(address _accessManager) internal {
    if (accessManager != _accessManager) {
      accessManager = _accessManager;
      emit AccessManagerUpdated(_accessManager);
    }
  }

  function _updateVaultRewardsContract(address _vaultRewards) internal {
    if (vaultRewards != _vaultRewards) {
      vaultRewards = _vaultRewards;
      emit VaultRewardsContractUpdated(_vaultRewards);
    }
  }
}

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

import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol";

struct StrategyInfo {
  uint256 activation;
  uint256 lastReport;
  uint256 totalDebt;
  uint256 totalGain;
  uint256 totalLoss;
}

interface IVault is IERC20, IERC20Permit {
  function name() external view returns (string memory);

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

  function decimals() external view returns (uint256);

  function activation() external view returns (uint256);

  function rewards() external view returns (address);

  function managementFee() external view returns (uint256);

  function gatekeeper() external view returns (address);

  function governance() external view returns (address);

  function creator() external view returns (address);

  function strategyDataStore() external view returns (address);

  function healthCheck() external view returns (address);

  function emergencyShutdown() external view returns (bool);

  function lockedProfitDegradation() external view returns (uint256);

  function depositLimit() external view returns (uint256);

  function lastReport() external view returns (uint256);

  function lockedProfit() external view returns (uint256);

  function totalDebt() external view returns (uint256);

  function token() external view returns (address);

  function totalAsset() external view returns (uint256);

  function availableDepositLimit() external view returns (uint256);

  function maxAvailableShares() external view returns (uint256);

  function pricePerShare() external view returns (uint256);

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

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

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

  function strategy(address _strategy) external view returns (StrategyInfo memory);

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

  function setRewards(address _rewards) external;

  function setManagementFee(uint256 _managementFee) external;

  function setGatekeeper(address _gatekeeper) external;

  function setStrategyDataStore(address _strategyDataStoreContract) external;

  function setHealthCheck(address _healthCheck) external;

  function setVaultEmergencyShutdown(bool _active) external;

  function setLockedProfileDegradation(uint256 _degradation) external;

  function setDepositLimit(uint256 _limit) external;

  function sweep(address _token, uint256 _amount) external;

  function addStrategy(address _strategy) external returns (bool);

  function migrateStrategy(address _oldVersion, address _newVersion) external returns (bool);

  function revokeStrategy() external;

  /// @notice deposit the given amount into the vault, and return the number of shares
  function deposit(uint256 _amount, address _recipient) external returns (uint256);

  /// @notice burn the given amount of shares from the vault, and return the number of underlying tokens recovered
  function withdraw(
    uint256 _shares,
    address _recipient,
    uint256 _maxLoss
  ) external returns (uint256);

  function report(
    uint256 _gain,
    uint256 _loss,
    uint256 _debtPayment
  ) external returns (uint256);
}

interface IBoostedVault {
  function totalBoostedSupply() external view returns (uint256);

  function boostedBalanceOf(address _user) external view returns (uint256);

  function updateBoostedBalancesForUsers(address[] calldata _users) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @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
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSAUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712Upgradeable is Initializable {
    /* solhint-disable var-name-mixedcase */
    bytes32 private _HASHED_NAME;
    bytes32 private _HASHED_VERSION;
    bytes32 private constant _TYPE_HASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");

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

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    function __EIP712_init(string memory name, string memory version) internal onlyInitializing {
        __EIP712_init_unchained(name, version);
    }

    function __EIP712_init_unchained(string memory name, string memory version) internal onlyInitializing {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        return _buildDomainSeparator(_TYPE_HASH, _EIP712NameHash(), _EIP712VersionHash());
    }

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

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

    /**
     * @dev The hash of the name parameter for the EIP712 domain.
     *
     * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
     * are a concern.
     */
    function _EIP712NameHash() internal virtual view returns (bytes32) {
        return _HASHED_NAME;
    }

    /**
     * @dev The hash of the version parameter for the EIP712 domain.
     *
     * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
     * are a concern.
     */
    function _EIP712VersionHash() internal virtual view returns (bytes32) {
        return _HASHED_VERSION;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../StringsUpgradeable.sol";

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

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

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

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. 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(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", StringsUpgradeable.toString(s.length), s));
    }

    /**
     * @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
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library CountersUpgradeable {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

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

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";

interface IGovernable {
  function proposeGovernance(address _pendingGovernance) external;

  function acceptGovernance() external;
}

abstract contract GovernableInternal {
  event GovenanceUpdated(address _govenance);
  event GovenanceProposed(address _pendingGovenance);

  /// @dev This contract is used as part of the Vault contract and it is upgradeable.
  ///  which means any changes to the state variables could corrupt the data. Do not modify these at all.
  /// @notice the address of the current governance
  address public governance;
  /// @notice the address of the pending governance
  address public pendingGovernance;

  /// @dev ensure msg.send is the governanace
  modifier onlyGovernance() {
    require(_getMsgSender() == governance, "governance only");
    _;
  }

  /// @dev ensure msg.send is the pendingGovernance
  modifier onlyPendingGovernance() {
    require(_getMsgSender() == pendingGovernance, "pending governance only");
    _;
  }

  /// @dev the deployer of the contract will be set as the initial governance
  // solhint-disable-next-line func-name-mixedcase
  function __Governable_init_unchained(address _governance) internal {
    require(_getMsgSender() != _governance, "invalid address");
    _updateGovernance(_governance);
  }

  ///@notice propose a new governance of the vault. Only can be called by the existing governance.
  ///@param _pendingGovernance the address of the pending governance
  function proposeGovernance(address _pendingGovernance) external onlyGovernance {
    require(_pendingGovernance != address(0), "invalid address");
    require(_pendingGovernance != governance, "already the governance");
    pendingGovernance = _pendingGovernance;
    emit GovenanceProposed(_pendingGovernance);
  }

  ///@notice accept the proposal to be the governance of the vault. Only can be called by the pending governance.
  function acceptGovernance() external onlyPendingGovernance {
    _updateGovernance(pendingGovernance);
  }

  function _updateGovernance(address _pendingGovernance) internal {
    governance = _pendingGovernance;
    emit GovenanceUpdated(governance);
  }

  /// @dev provides an internal function to allow reduce the contract size
  function _onlyGovernance() internal view {
    require(_getMsgSender() == governance, "governance only");
  }

  function _getMsgSender() internal view virtual returns (address);
}

/// @dev Add a `governance` and a `pendingGovernance` role to the contract, and implements a 2-phased nominatiom process to change the governance.
///   Also provides a modifier to allow controlling access to functions of the contract.
contract Governable is Context, GovernableInternal {
  constructor(address _governance) GovernableInternal() {
    __Governable_init_unchained(_governance);
  }

  function _getMsgSender() internal view override returns (address) {
    return _msgSender();
  }
}

/// @dev ungradeable version of the {Governable} contract. Can be used as part of an upgradeable contract.
abstract contract GovernableUpgradeable is ContextUpgradeable, GovernableInternal {
  // solhint-disable-next-line no-empty-blocks
  constructor() {}

  // solhint-disable-next-line func-name-mixedcase
  function __Governable_init(address _governance) internal {
    __Context_init();
    __Governable_init_unchained(_governance);
  }

  // solhint-disable-next-line func-name-mixedcase
  function _getMsgSender() internal view override returns (address) {
    return _msgSender();
  }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;

import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "../../interfaces/roles/IGatekeeperable.sol";

/// @dev Add the `Gatekeeper` role.
///   Gatekeepers will help ensure the security of the vaults. They can set vault limits, pause deposits or withdraws.
///   For vaults that defined restricted access, they will be able to control the access to these vaults as well.
///   This contract also provides a `onlyGatekeeper` modifier to allow controlling access to functions of the contract.
abstract contract Gatekeeperable is IGatekeeperable, ContextUpgradeable {
  event GatekeeperUpdated(address _guardian);

  /// @notice the address of the guardian for the vault
  /// @dev This contract is used as part of the Vault contract and it is upgradeable.
  ///  which means any changes to the state variables could corrupt the data. Do not modify this at all.
  address public gatekeeper;

  /// @dev make sure msg.sender is the guardian or the governance
  modifier onlyGovernanceOrGatekeeper(address _governance) {
    _onlyGovernanceOrGatekeeper(_governance);
    _;
  }

  // solhint-disable-next-line no-empty-blocks
  constructor() {}

  /// @dev set the initial value for the gatekeeper. The deployer can not be the gatekeeper.
  /// @param _gatekeeper the default address of the guardian
  // solhint-disable-next-line func-name-mixedcase
  function __Gatekeeperable_init_unchained(address _gatekeeper) internal {
    require(_msgSender() != _gatekeeper, "invalid address");
    _updateGatekeeper(_gatekeeper);
  }

  // solhint-disable-next-line func-name-mixedcase
  function __Gatekeeperable_init(address _gatekeeper) internal {
    __Context_init();
    __Gatekeeperable_init_unchained(_gatekeeper);
  }

  ///@dev this can be used internally to update the gatekeep. If you want to expose it, create an external function in the implementation contract and call this.
  function _updateGatekeeper(address _gatekeeper) internal {
    require(_gatekeeper != address(0), "address is not valid");
    require(_gatekeeper != gatekeeper, "already the gatekeeper");
    gatekeeper = _gatekeeper;
    emit GatekeeperUpdated(_gatekeeper);
  }

  function _onlyGovernanceOrGatekeeper(address _governance) internal view {
    require((_msgSender() == _governance) || (gatekeeper != address(0) && gatekeeper == _msgSender()), "!authorised");
  }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
pragma abicoder v2;
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import {StrategyInfo} from "../interfaces/IVault.sol";

/// @dev this contract is used to declare all the state variables that will be used by a Vault.
///  Because the vault itself is upgradeable, changes to state variables could cause data corruption.
///  The only safe operation is to add new fields, or rename an existing one (still not recommended to rename a field).
///  To avoid any issues, if a new field is needed, we should create a new version of the data store and extend the previous version,
///  rather than modifying the state variables directly.
// solhint-disable-next-line max-states-count
contract VaultDataStorage {
  // ### Vault base properties
  uint8 internal vaultDecimals;
  bool public emergencyShutdown;
  /// @notice timestamp for when the vault is deployed
  uint256 public activation;
  uint256 public managementFee;
  /// @notice degradation for locked profit per second
  /// @dev the value is based on 6-hour degradation period (1/(60*60*6) = 0.000046)
  ///   NOTE: This is being deprecated by Yearn. See https://github.com/yearn/yearn-vaults/pull/471
  uint256 internal lockedProfitDegradation;
  uint256 public depositLimit;
  /// @notice the timestamp of the last report received from a strategy
  uint256 internal lastReport;
  /// @notice how much profit is locked and cant be withdrawn
  uint256 public lockedProfit;
  /// @notice total value borrowed by all the strategies
  uint256 public totalDebt;

  address public feeCollection;
  address public healthCheck;
  address public strategyDataStore;
  address public accessManager;
  address public creator;

  IERC20Upgradeable public token;
  mapping(address => StrategyInfo) internal strategies;

  uint256 internal constant DEGRADATION_COEFFICIENT = 10**18;
  address public vaultRewards;
  /// @dev This is used to track the last deposit time of a user.
  ///  It will be checked before the vault receipt token is transferred and they can only happen at least 1 block later to prevent flash loan attacks
  mapping(address => uint256) internal dt;

  /// @dev set the default values for the state variables here
  // solhint-disable-next-line func-name-mixedcase
  function __VaultDataStorage_init() internal {
    vaultDecimals = 18;
    lockedProfitDegradation = (DEGRADATION_COEFFICIENT * 46) / 10**6;
    depositLimit = type(uint256).max;
    /* solhint-disable  not-rely-on-time */
    activation = block.timestamp;
    lastReport = block.timestamp;
    /* solhint-enable */
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

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

interface IGatekeeperable {
  function gatekeeper() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-ERC20Permit.sol)

pragma solidity ^0.8.0;

import "./draft-IERC20Permit.sol";
import "../ERC20.sol";
import "../../../utils/cryptography/draft-EIP712.sol";
import "../../../utils/cryptography/ECDSA.sol";
import "../../../utils/Counters.sol";

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

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

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

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

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

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

        bytes32 hash = _hashTypedDataV4(structHash);

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

        _approve(owner, spender, value);
    }

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `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");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

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

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

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `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");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(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:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

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

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

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

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

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

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

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

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. 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(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @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
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

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

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

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

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20Upgradeable.sol";

{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {
    "contracts/libraries/VaultUtils.sol": {
      "VaultUtils": "0x3252456634469ce6c2540c02cbfa98320e32f223"
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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