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// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/SafeERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";

import "../../interfaces/concentrator/IAladdinCRV.sol";
import "../../interfaces/concentrator/IAladdinCompounder.sol";
import "../../interfaces/concentrator/IConcentratorStrategy.sol";
import "../../interfaces/IConvexBasicRewards.sol";
import "../../interfaces/IConvexCRVDepositor.sol";
import "../../interfaces/ICurveFactoryPlainPool.sol";
import "../../interfaces/ICvxCrvStakingWrapper.sol";
import "../../interfaces/IZap.sol";

import "../../common/fees/FeeCustomization.sol";
import "../ConcentratorBase.sol";

// solhint-disable no-empty-blocks, reason-string
contract AladdinCRVV2 is
  ERC20Upgradeable,
  OwnableUpgradeable,
  ReentrancyGuardUpgradeable,
  FeeCustomization,
  ConcentratorBase,
  IAladdinCRV,
  IAladdinCompounder
{
  using SafeMathUpgradeable for uint256;
  using SafeERC20Upgradeable for IERC20Upgradeable;

  /// @notice Emitted when pool assets migrated.
  /// @param _oldStrategy The address of old strategy.
  /// @param _newStrategy The address of current strategy.
  event MigrateStrategy(address _oldStrategy, address _newStrategy);

  /// @dev The type for withdraw fee, used in FeeCustomization.
  bytes32 internal constant WITHDRAW_FEE_TYPE = keccak256("AladdinCRV.WithdrawFee");

  /// @dev The maximum percentage of withdraw fee.
  uint256 private constant MAX_WITHDRAW_FEE = 1e8; // 10%

  /// @dev The maximum percentage of platform fee.
  uint256 private constant MAX_PLATFORM_FEE = 2e8; // 20%

  /// @dev The maximum percentage of harvest bounty.
  uint256 private constant MAX_HARVEST_BOUNTY = 1e8; // 10%

  /// @dev The address of cvxCRV token.
  address private constant CVXCRV = 0x62B9c7356A2Dc64a1969e19C23e4f579F9810Aa7;

  /// @dev The address of CRV token.
  address private constant CRV = 0xD533a949740bb3306d119CC777fa900bA034cd52;

  /// @dev The address of CVX token.
  address private constant CVX = 0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B;

  /// @dev The address of Convex cvxCRV Staking Contract.
  address private constant CVXCRV_STAKING = 0x3Fe65692bfCD0e6CF84cB1E7d24108E434A7587e;

  /// @dev The address of Convex CRV => cvxCRV Contract.
  address private constant CRV_DEPOSITOR = 0x8014595F2AB54cD7c604B00E9fb932176fDc86Ae;

  /// @dev The address of Curve cvxCRV/CRV pool.
  address private immutable curveCvxCrvPool;

  /// @dev The token index for CRV in Curve cvxCRV/CRV pool.
  int128 private immutable poolIndexCRV;

  /// @dev The address of CvxCrvStakingWrapper contract.
  address private immutable wrapper;

  /// @notice The address of ZAP contract, will be used to swap tokens.
  address public zap;

  /// @notice The percentage of token to take on withdraw
  uint256 public withdrawFeePercentage;

  /// @notice The percentage of rewards to take for platform on harvest
  uint256 public platformFeePercentage;

  /// @notice The percentage of rewards to take for caller on harvest
  uint256 public harvestBountyPercentage;

  /// @notice The address of recipient of platform fee
  address public platform;

  /// @inheritdoc IAladdinCRV
  uint256 public override totalUnderlying;

  /// @notice The address of strategy.
  address public strategy;

  /// @notice The address of rewards depositor.
  address public depositor;

  receive() external payable {}

  constructor(address _curveCvxCrvPool, address _wrapper) {
    curveCvxCrvPool = _curveCvxCrvPool;
    address _token0 = ICurveFactoryPlainPool(_curveCvxCrvPool).coins(0);
    poolIndexCRV = _token0 == CRV ? 0 : 1;
    wrapper = _wrapper;
  }

  function initializeV2(address _strategy) external {
    require(strategy == address(0), "initialized");
    strategy = _strategy;

    // make sure harvest is called before upgrade.
    require(IConvexBasicRewards(CVXCRV_STAKING).earned(address(this)) == 0, "not harvested");

    // withdraw all cvxCRV from staking contract
    uint256 _totalUnderlying = IConvexBasicRewards(CVXCRV_STAKING).balanceOf(address(this));
    IConvexBasicRewards(CVXCRV_STAKING).withdraw(_totalUnderlying, false);

    // transfer all cvxCRV to strategy contract.
    IERC20Upgradeable(CVXCRV).safeTransfer(_strategy, _totalUnderlying);
    IConcentratorStrategy(_strategy).deposit(address(0), _totalUnderlying);
    totalUnderlying = _totalUnderlying;

    // approves
    IERC20Upgradeable(CRV).safeApprove(curveCvxCrvPool, uint256(-1));
    IERC20Upgradeable(CRV).safeApprove(CRV_DEPOSITOR, uint256(-1));
  }

  /********************************** View Functions **********************************/

  /// @inheritdoc IAladdinCRV
  /// @dev deprecated.
  function balanceOfUnderlying(address _user) external view override returns (uint256) {
    uint256 _totalSupply = totalSupply();
    if (_totalSupply == 0) return 0;
    uint256 _balance = balanceOf(_user);
    return _balance.mul(totalUnderlying) / _totalSupply;
  }

  /// @inheritdoc IAladdinCompounder
  function asset() external pure override returns (address) {
    return CVXCRV;
  }

  /// @inheritdoc IAladdinCompounder
  function totalAssets() public view override returns (uint256) {
    return totalUnderlying;
  }

  /// @inheritdoc IAladdinCompounder
  function convertToShares(uint256 _assets) public view override returns (uint256 shares) {
    uint256 _totalAssets = totalAssets();
    if (_totalAssets == 0) return _assets;

    uint256 _totalShares = totalSupply();
    return _totalShares.mul(_assets) / _totalAssets;
  }

  /// @inheritdoc IAladdinCompounder
  function convertToAssets(uint256 _shares) public view override returns (uint256) {
    uint256 _totalShares = totalSupply();
    if (_totalShares == 0) return _shares;

    uint256 _totalAssets = totalAssets();
    return _totalAssets.mul(_shares) / _totalShares;
  }

  /// @inheritdoc IAladdinCompounder
  function maxDeposit(address) external pure override returns (uint256) {
    return uint256(-1);
  }

  /// @inheritdoc IAladdinCompounder
  function previewDeposit(uint256 _assets) external view override returns (uint256) {
    return convertToShares(_assets);
  }

  /// @inheritdoc IAladdinCompounder
  function maxMint(address) external pure override returns (uint256) {
    return uint256(-1);
  }

  /// @inheritdoc IAladdinCompounder
  function previewMint(uint256 _shares) external view override returns (uint256) {
    return convertToAssets(_shares);
  }

  /// @inheritdoc IAladdinCompounder
  function maxWithdraw(address) external pure override returns (uint256) {
    return uint256(-1);
  }

  /// @inheritdoc IAladdinCompounder
  function previewWithdraw(uint256 _assets) external view override returns (uint256) {
    uint256 _totalAssets = totalAssets();
    require(_assets <= _totalAssets, "exceed total assets");
    uint256 _shares = convertToShares(_assets);
    if (_assets == _totalAssets) {
      return _shares;
    } else {
      return _shares.mul(FEE_PRECISION).div(FEE_PRECISION - withdrawFeePercentage);
    }
  }

  /// @inheritdoc IAladdinCompounder
  function maxRedeem(address) external pure override returns (uint256) {
    return uint256(-1);
  }

  /// @inheritdoc IAladdinCompounder
  function previewRedeem(uint256 _shares) external view override returns (uint256) {
    uint256 _totalSupply = totalSupply();
    require(_shares <= _totalSupply, "exceed total supply");

    uint256 _assets = convertToAssets(_shares);
    if (_shares == totalSupply()) {
      return _assets;
    } else {
      uint256 _withdrawFee = _assets.mul(withdrawFeePercentage) / FEE_PRECISION;
      return _assets - _withdrawFee;
    }
  }

  /********************************** Mutated Functions **********************************/

  /// @inheritdoc IAladdinCompounder
  function deposit(uint256 _assets, address _receiver) public override nonReentrant returns (uint256) {
    if (_assets == uint256(-1)) {
      _assets = IERC20Upgradeable(CVXCRV).balanceOf(msg.sender);
    }

    address _strategy = strategy;
    IERC20Upgradeable(CVXCRV).safeTransferFrom(msg.sender, _strategy, _assets);
    IConcentratorStrategy(_strategy).deposit(_receiver, _assets);

    return _deposit(_receiver, _assets);
  }

  /// @inheritdoc IAladdinCompounder
  function mint(uint256 _shares, address _receiver) external override nonReentrant returns (uint256) {
    uint256 _assets = convertToAssets(_shares);
    deposit(_assets, _receiver);
    return _assets;
  }

  /// @inheritdoc IAladdinCompounder
  function withdraw(
    uint256 _assets,
    address _receiver,
    address _owner
  ) external override nonReentrant returns (uint256) {
    if (_assets == uint256(-1)) {
      _assets = convertToAssets(balanceOf(_owner));
    }

    uint256 _totalAssets = totalAssets();
    require(_assets <= _totalAssets, "exceed total assets");

    uint256 _shares = convertToShares(_assets);
    if (_assets < _totalAssets) {
      uint256 _withdrawPercentage = getFeeRate(WITHDRAW_FEE_TYPE, _owner);
      _shares = _shares.mul(FEE_PRECISION).div(FEE_PRECISION - _withdrawPercentage);
    }

    if (msg.sender != _owner) {
      uint256 _allowance = allowance(_owner, msg.sender);
      require(_allowance >= _shares, "withdraw exceeds allowance");
      if (_allowance != uint256(-1)) {
        // decrease allowance if it is not max
        _approve(_owner, msg.sender, _allowance - _shares);
      }
    }

    _withdraw(_shares, _receiver, _owner);
    return _shares;
  }

  /// @inheritdoc IAladdinCompounder
  function redeem(
    uint256 _shares,
    address _receiver,
    address _owner
  ) public override nonReentrant returns (uint256) {
    if (_shares == uint256(-1)) {
      _shares = balanceOf(_owner);
    }

    if (msg.sender != _owner) {
      uint256 _allowance = allowance(_owner, msg.sender);
      require(_allowance >= _shares, "redeem exceeds allowance");
      if (_allowance != uint256(-1)) {
        // decrease allowance if it is not max
        _approve(_owner, msg.sender, _allowance - _shares);
      }
    }

    return _withdraw(_shares, _receiver, _owner);
  }

  /// @inheritdoc IAladdinCRV
  /// @dev deprecated.
  function deposit(address _recipient, uint256 _amount) public override returns (uint256) {
    return deposit(_amount, _recipient);
  }

  /// @inheritdoc IAladdinCRV
  /// @dev deprecated.
  function depositAll(address _recipient) external override returns (uint256) {
    return deposit(uint256(-1), _recipient);
  }

  /// @inheritdoc IAladdinCRV
  function depositWithCRV(address _recipient, uint256 _amount) public override nonReentrant returns (uint256) {
    if (_amount == uint256(-1)) {
      _amount = IERC20Upgradeable(CRV).balanceOf(msg.sender);
    }
    IERC20Upgradeable(CRV).safeTransferFrom(msg.sender, address(this), _amount);

    address _strategy = strategy;
    _amount = _swapCRVToCvxCRV(_amount, _strategy);
    IConcentratorStrategy(_strategy).deposit(_recipient, _amount);

    return _deposit(_recipient, _amount);
  }

  /// @inheritdoc IAladdinCRV
  /// @dev deprecated.
  function depositAllWithCRV(address _recipient) external override returns (uint256) {
    return depositWithCRV(_recipient, uint256(-1));
  }

  /// @notice Deposit cvxCRV staking wrapper token to this contract
  /// @param _recipient - The address who will receive the aCRV token.
  /// @param _amount - The amount of cvxCRV staking wrapper to deposit.
  /// @return share - The amount of aCRV received.
  function depositWithWrapper(address _recipient, uint256 _amount) external returns (uint256) {
    if (_amount == uint256(-1)) {
      _amount = IERC20Upgradeable(wrapper).balanceOf(msg.sender);
    }
    IERC20Upgradeable(wrapper).safeTransferFrom(msg.sender, strategy, _amount);
    return _deposit(_recipient, _amount);
  }

  /// @inheritdoc IAladdinCRV
  /// @dev deprecated.
  function withdraw(
    address _recipient,
    uint256 _shares,
    uint256 _minimumOut,
    WithdrawOption _option
  ) public override nonReentrant returns (uint256 _withdrawed) {
    if (_shares == uint256(-1)) {
      _shares = balanceOf(msg.sender);
    }

    if (_option == WithdrawOption.Withdraw) {
      _withdrawed = _withdraw(_shares, _recipient, msg.sender);
      require(_withdrawed >= _minimumOut, "AladdinCRV: insufficient output");
    } else {
      _withdrawed = _withdraw(_shares, address(this), msg.sender);
      _withdrawed = _withdrawAs(_recipient, _withdrawed, _minimumOut, _option);
    }

    // legacy event from IAladdinCRV
    emit Withdraw(msg.sender, _recipient, _shares, _option);
  }

  /// @inheritdoc IAladdinCRV
  /// @dev deprecated.
  function withdrawAll(
    address _recipient,
    uint256 _minimumOut,
    WithdrawOption _option
  ) external override returns (uint256) {
    return withdraw(_recipient, uint256(-1), _minimumOut, _option);
  }

  /// @inheritdoc IAladdinCompounder
  function harvest(address _recipient, uint256 _minimumOut)
    public
    override(IAladdinCRV, IAladdinCompounder)
    nonReentrant
    returns (uint256)
  {
    ensureCallerIsHarvester();

    return _harvest(_recipient, _minimumOut);
  }

  /// @notice Deposit and notify new rewards.
  /// @param _amount The amount of rewards to deposit.
  function depositReward(uint256 _amount) external {
    require(depositor == msg.sender, "only reward depositor");

    address _strategy = strategy;
    IERC20Upgradeable(CVXCRV).safeTransferFrom(msg.sender, _strategy, _amount);
    IConcentratorStrategy(_strategy).deposit(address(this), _amount);

    totalUnderlying += _amount;
  }

  /********************************** Restricted Functions **********************************/

  /// @notice Update the withdraw fee percentage.
  /// @param _feePercentage - The fee percentage to update.
  function updateWithdrawFeePercentage(uint256 _feePercentage) external onlyOwner {
    require(_feePercentage <= MAX_WITHDRAW_FEE, "AladdinCRV: fee too large");
    withdrawFeePercentage = _feePercentage;

    emit UpdateWithdrawalFeePercentage(_feePercentage);
  }

  /// @notice Update the platform fee percentage.
  /// @param _feePercentage - The fee percentage to update.
  function updatePlatformFeePercentage(uint256 _feePercentage) external onlyOwner {
    require(_feePercentage <= MAX_PLATFORM_FEE, "AladdinCRV: fee too large");
    platformFeePercentage = _feePercentage;

    emit UpdatePlatformFeePercentage(_feePercentage);
  }

  /// @notice Update the harvest bounty percentage.
  /// @param _percentage - The fee percentage to update.
  function updateHarvestBountyPercentage(uint256 _percentage) external onlyOwner {
    require(_percentage <= MAX_HARVEST_BOUNTY, "AladdinCRV: fee too large");
    harvestBountyPercentage = _percentage;

    emit UpdateHarvestBountyPercentage(_percentage);
  }

  /// @notice Update the recipient
  function updatePlatform(address _platform) external onlyOwner {
    require(_platform != address(0), "AladdinCRV: zero platform address");
    platform = _platform;

    emit UpdatePlatform(_platform);
  }

  /// @notice Update the zap contract
  function updateZap(address _zap) external onlyOwner {
    require(_zap != address(0), "AladdinCRV: zero zap address");
    zap = _zap;

    emit UpdateZap(_zap);
  }

  /// @notice Update the harvester contract
  /// @param _harvester The address of the harvester contract.
  function updateHarvester(address _harvester) external onlyOwner {
    _updateHarvester(_harvester);
  }

  /// @notice Update the address of reward depositor.
  /// @param _depositor The address of reward depositor.
  function updateDepositor(address _depositor) external onlyOwner {
    depositor = _depositor;
  }

  /// @notice Migrate pool assets to new strategy.
  /// @param _newStrategy The address of new strategy.
  function migrateStrategy(address _newStrategy) external onlyOwner {
    require(_newStrategy != address(0), "AladdinCRV: zero new strategy address");

    uint256 _totalUnderlying = totalUnderlying;
    address _oldStrategy = strategy;
    strategy = _newStrategy;

    IConcentratorStrategy(_oldStrategy).prepareMigrate(_newStrategy);
    IConcentratorStrategy(_oldStrategy).withdraw(_newStrategy, _totalUnderlying);
    IConcentratorStrategy(_oldStrategy).finishMigrate(_newStrategy);

    IConcentratorStrategy(_newStrategy).deposit(address(this), _totalUnderlying);

    emit MigrateStrategy(_oldStrategy, _newStrategy);
  }

  /// @notice Update rewards list of underlying strategy.
  /// @param newRewards The list of addresses of new rewards.
  function updateStrategyRewards(address[] memory newRewards) external onlyOwner {
    IConcentratorStrategy(strategy).updateRewards(newRewards);
  }

  /// @notice Update withdraw fee for certain user.
  /// @param _user The address of user to update.
  /// @param _percentage The withdraw fee percentage to be updated, multipled by 1e9.
  function setWithdrawFeeForUser(address _user, uint32 _percentage) external onlyOwner {
    require(_percentage <= MAX_WITHDRAW_FEE, "withdraw fee too large");

    _setFeeCustomization(WITHDRAW_FEE_TYPE, _user, _percentage);
  }

  /********************************** Internal Functions **********************************/

  function _deposit(address _recipient, uint256 _amount) internal returns (uint256) {
    require(_amount > 0, "AladdinCRV: zero amount deposit");
    uint256 _totalUnderlying = totalUnderlying;
    uint256 _totalSupply = totalSupply();

    uint256 _shares;
    if (_totalSupply == 0) {
      _shares = _amount;
    } else {
      _shares = _amount.mul(_totalSupply) / _totalUnderlying;
    }
    _mint(_recipient, _shares);
    totalUnderlying = _totalUnderlying + _amount;

    // legacy event from IAladdinCRV
    emit Deposit(msg.sender, _recipient, _amount);

    emit Deposit(msg.sender, _recipient, _amount, _shares);
    return _shares;
  }

  function _withdraw(
    uint256 _shares,
    address _receiver,
    address _owner
  ) internal returns (uint256 _withdrawable) {
    require(_shares > 0, "AladdinCRV: zero share withdraw");
    require(_shares <= balanceOf(_owner), "AladdinCRV: shares not enough");
    uint256 _totalUnderlying = totalUnderlying;
    uint256 _amount = _shares.mul(_totalUnderlying) / totalSupply();
    _burn(_owner, _shares);

    if (totalSupply() == 0) {
      // If user is last to withdraw, harvest before exit
      // The first parameter is actually not used.
      _harvest(msg.sender, 0);
      _totalUnderlying = totalUnderlying; // `totalUnderlying` is updated in `_harvest`.
      _withdrawable = _totalUnderlying;
      IConcentratorStrategy(strategy).withdraw(_receiver, _withdrawable);
    } else {
      // Otherwise compute share and unstake
      _withdrawable = _amount;
      // Substract a small withdrawal fee to prevent users "timing"
      // the harvests. The fee stays staked and is therefore
      // redistributed to all remaining participants.
      uint256 _withdrawFeePercentage = getFeeRate(WITHDRAW_FEE_TYPE, _owner);
      uint256 _withdrawFee = (_withdrawable * _withdrawFeePercentage) / FEE_PRECISION;
      _withdrawable = _withdrawable - _withdrawFee; // never overflow here
      IConcentratorStrategy(strategy).withdraw(_receiver, _withdrawable);
    }
    totalUnderlying = _totalUnderlying - _withdrawable;

    emit Withdraw(msg.sender, _receiver, _owner, _withdrawable, _shares);

    return _withdrawable;
  }

  function _withdrawAs(
    address _recipient,
    uint256 _amount,
    uint256 _minimumOut,
    WithdrawOption _option
  ) internal returns (uint256) {
    if (_option == WithdrawOption.WithdrawAndStake) {
      // simply stake the cvxCRV for _recipient
      require(_amount >= _minimumOut, "AladdinCRV: insufficient output");
      IERC20Upgradeable(CVXCRV).safeApprove(wrapper, 0);
      IERC20Upgradeable(CVXCRV).safeApprove(wrapper, _amount);
      ICvxCrvStakingWrapper(wrapper).stakeFor(_recipient, _amount);
    } else {
      address _toToken;
      if (_option == WithdrawOption.WithdrawAsCRV) _toToken = CRV;
      else if (_option == WithdrawOption.WithdrawAsETH) _toToken = address(0);
      else if (_option == WithdrawOption.WithdrawAsCVX) _toToken = CVX;
      else revert("AladdinCRV: unsupported option");

      address _zap = zap;
      IERC20Upgradeable(CVXCRV).safeTransfer(_zap, _amount);
      _amount = IZap(_zap).zap(CVXCRV, _amount, _toToken, _minimumOut);

      if (_toToken == address(0)) {
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = _recipient.call{ value: _amount }("");
        require(success, "AladdinCRV: ETH transfer failed");
      } else {
        IERC20Upgradeable(_toToken).safeTransfer(_recipient, _amount);
      }
    }
    return _amount;
  }

  function _harvest(address _recipient, uint256 _minimumOut) internal returns (uint256) {
    address _strategy = strategy;

    // harvest CRV from strategy
    uint256 _amountCRV = IConcentratorStrategy(_strategy).harvest(zap, CRV);
    // swap CRV to cvxCRV
    uint256 _amount = _swapCRVToCvxCRV(_amountCRV, _strategy);
    require(_amount >= _minimumOut, "AladdinCRV: insufficient rewards");
    // send back to strategy
    IConcentratorStrategy(_strategy).deposit(address(0), _amount);

    // legacy event from IAladdinCRV
    emit Harvest(msg.sender, _amount);

    // distribute fee and bounty
    uint256 _totalSupply = totalSupply();
    uint256 _platformFee = platformFeePercentage;
    uint256 _harvestBounty = harvestBountyPercentage;
    if (_platformFee > 0) {
      _platformFee = (_platformFee * _amount) / FEE_PRECISION;
    }
    if (_harvestBounty > 0) {
      _harvestBounty = (_harvestBounty * _amount) / FEE_PRECISION;
    }
    uint256 _stakeAmount = _amount - _platformFee - _harvestBounty; // never overflow here
    // This is the amount of underlying after staking harvested rewards.
    uint256 _underlying = totalUnderlying + _stakeAmount;
    // This is the share for platform fee.
    _platformFee = (_platformFee * _totalSupply) / _underlying;
    // This is the share for harvest bounty.
    _harvestBounty = (_harvestBounty * _totalSupply) / _underlying;

    emit Harvest(msg.sender, _recipient, _amount, _platformFee, _harvestBounty);

    _mint(platform, _platformFee);
    _mint(_recipient, _harvestBounty);

    totalUnderlying += _amount;
    return _amount;
  }

  /// @dev Internal function to swap CRV to cvxCRV
  /// @param _amountIn The amount of CRV to swap.
  /// @param _recipient The address of recipient who will recieve the cvxCRV.
  function _swapCRVToCvxCRV(uint256 _amountIn, address _recipient) internal returns (uint256) {
    // CRV swap to CVXCRV or stake to CVXCRV
    // CRV swap to CVXCRV or stake to CVXCRV
    uint256 _amountOut = ICurveFactoryPlainPool(curveCvxCrvPool).get_dy(poolIndexCRV, 1 - poolIndexCRV, _amountIn);
    bool useCurve = _amountOut > _amountIn;

    if (useCurve) {
      IERC20Upgradeable(CRV).safeApprove(curveCvxCrvPool, 0);
      IERC20Upgradeable(CRV).safeApprove(curveCvxCrvPool, _amountIn);
      _amountOut = ICurveFactoryPlainPool(curveCvxCrvPool).exchange(
        poolIndexCRV,
        1 - poolIndexCRV,
        _amountIn,
        0,
        _recipient
      );
    } else {
      uint256 _lockIncentive = IConvexCRVDepositor(CRV_DEPOSITOR).lockIncentive();
      // if use `lock = false`, will possible take fee
      // if use `lock = true`, some incentive will be given
      _amountOut = IERC20Upgradeable(CVXCRV).balanceOf(address(this));
      if (_lockIncentive == 0) {
        // no lock incentive, use `lock = false`
        IConvexCRVDepositor(CRV_DEPOSITOR).deposit(_amountIn, false, address(0));
      } else {
        // no lock incentive, use `lock = true`
        IConvexCRVDepositor(CRV_DEPOSITOR).deposit(_amountIn, true, address(0));
      }
      _amountOut = IERC20Upgradeable(CVXCRV).balanceOf(address(this)) - _amountOut; // never overflow here
      if (_recipient != address(this)) {
        IERC20Upgradeable(CVXCRV).safeTransfer(_recipient, _amountOut);
      }
    }
    return _amountOut;
  }

  /// @inheritdoc FeeCustomization
  function _defaultFeeRate(bytes32) internal view override returns (uint256) {
    return withdrawFeePercentage;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <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 {UpgradeableProxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

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

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

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

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../../utils/ContextUpgradeable.sol";
import "./IERC20Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../proxy/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 guidelines: functions revert instead
 * of 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 {
    using SafeMathUpgradeable for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @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);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

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

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

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

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

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

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

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

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

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

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
    uint256[44] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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

pragma solidity ^0.7.0;

import "./IERC20Upgradeable.sol";
import "../../math/SafeMathUpgradeable.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 SafeMathUpgradeable for uint256;
    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'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _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
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

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

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

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

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

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

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

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/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 GSN 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 initializer {
        __Context_init_unchained();
    }

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

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;
import "../proxy/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 initializer {
        __ReentrancyGuard_init_unchained();
    }

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

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

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

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

// solhint-disable no-inline-assembly

abstract contract FeeCustomization {
  /// @notice Emitted when a fee customization is set.
  /// @param _feeType The type of fee to set.
  /// @param _user The address of user to set.
  /// @param _rate The fee rate for the user.
  event CustomizeFee(bytes32 _feeType, address _user, uint256 _rate);

  /// @notice Emitted when a fee customization is cancled.
  /// @param _feeType The type of fee to cancle.
  /// @param _user The address of user to cancle.
  event CancleCustomizeFee(bytes32 _feeType, address _user);

  /// @dev The fee denominator used for rate calculation.
  uint256 internal constant FEE_PRECISION = 1e9;

  /// @dev The salt used to compute storage slot.
  bytes32 private constant SALT = keccak256("FeeCustomization");

  /// @notice Return the fee rate for the user
  /// @param _feeType The type of fee to query.
  /// @param _user The address of user to query.
  /// @return rate The rate of fee for the user, multiplied by 1e9
  function getFeeRate(bytes32 _feeType, address _user) public view returns (uint256 rate) {
    rate = _defaultFeeRate(_feeType);

    (uint8 _customized, uint32 _rate) = _loadFeeCustomization(_feeType, _user);
    if (_customized == 1) {
      rate = _rate;
    }
  }

  /// @dev Internal function to set customized fee for user.
  /// @param _feeType The type of fee to update.
  /// @param _user The address of user to update.
  /// @param _rate The fee rate to update.
  function _setFeeCustomization(
    bytes32 _feeType,
    address _user,
    uint32 _rate
  ) internal {
    require(_rate <= FEE_PRECISION, "rate too large");

    uint256 _slot = _computeStorageSlot(_feeType, _user);
    uint256 _encoded = _encode(1, _rate);
    assembly {
      sstore(_slot, _encoded)
    }

    emit CustomizeFee(_feeType, _user, _rate);
  }

  /// @dev Internal function to cancel fee customization.
  /// @param _feeType The type of fee to update.
  /// @param _user The address of user to update.
  function _cancleFeeCustomization(bytes32 _feeType, address _user) internal {
    uint256 _slot = _computeStorageSlot(_feeType, _user);
    assembly {
      sstore(_slot, 0)
    }

    emit CancleCustomizeFee(_feeType, _user);
  }

  /// @dev Return the default fee rate for certain type.
  /// @param _feeType The type of fee to query.
  /// @return rate The default rate of fee, multiplied by 1e9
  function _defaultFeeRate(bytes32 _feeType) internal view virtual returns (uint256 rate);

  /// @dev Internal function to load fee customization from storage.
  /// @param _feeType The type of fee to query.
  /// @param _user The address of user to query.
  /// @return customized Whether there is a customization.
  /// @return rate The customized fee rate, multiplied by 1e9.
  function _loadFeeCustomization(bytes32 _feeType, address _user) private view returns (uint8 customized, uint32 rate) {
    uint256 _slot = _computeStorageSlot(_feeType, _user);
    uint256 _encoded;
    assembly {
      _encoded := sload(_slot)
    }
    (customized, rate) = _decode(_encoded);
  }

  /// @dev Internal function to compute storage slot for fee storage.
  /// @param _feeType The type of fee.
  /// @param _user The address of user.
  /// @return slot The destination storage slot.
  function _computeStorageSlot(bytes32 _feeType, address _user) private pure returns (uint256 slot) {
    bytes32 salt = SALT;
    assembly {
      mstore(0x00, _feeType)
      mstore(0x20, xor(_user, salt))
      slot := keccak256(0x00, 0x40)
    }
  }

  /// @dev Internal function to encode customized fee data. The encoding is
  /// low ---------------------> high
  /// |   8 bits   | 32 bits | 216 bits |
  /// | customized |   rate  | reserved |
  ///
  /// @param customized If it is 0, there is no customization; if it is 1, there is customization.
  /// @param rate The customized fee rate, multiplied by 1e9.
  function _encode(uint8 customized, uint32 rate) private pure returns (uint256 encoded) {
    encoded = (uint256(rate) << 8) | uint256(customized);
  }

  /// @dev Internal function to decode data.
  /// @param _encoded The data to decode.
  /// @return customized Whether there is a customization.
  /// @return rate The customized fee rate, multiplied by 1e9.
  function _decode(uint256 _encoded) private pure returns (uint8 customized, uint32 rate) {
    customized = uint8(_encoded & 0xff);
    rate = uint32((_encoded >> 8) & 0xffffffff);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

// solhint-disable no-inline-assembly

contract ConcentratorBase {
  /**********
   * Events *
   **********/

  /// @notice Emitted when the harvester contract is updated.
  /// @param _harvester The address of the harvester contract.
  event UpdateHarvester(address _harvester);

  /// @notice Emitted when the zap contract is updated.
  /// @param _zap The address of the zap contract.
  event UpdateZap(address _zap);

  /*************
   * Constants *
   *************/

  /// @dev The storage slot for harvester storage.
  bytes32 private constant CONCENTRATOR_STORAGE_POSITION = keccak256("concentrator.base.storage");

  /***********
   * Structs *
   ***********/

  struct BaseStorage {
    address harvester;
    uint256[100] gaps;
  }

  /**********************
   * Internal Functions *
   **********************/

  function baseStorage() internal pure returns (BaseStorage storage bs) {
    bytes32 position = CONCENTRATOR_STORAGE_POSITION;
    assembly {
      bs.slot := position
    }
  }

  function _updateHarvester(address _harvester) internal {
    baseStorage().harvester = _harvester;

    emit UpdateHarvester(_harvester);
  }

  function ensureCallerIsHarvester() internal view {
    address _harvester = baseStorage().harvester;

    require(_harvester == address(0) || _harvester == msg.sender, "only harvester");
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

/// @title IAladdinCompounder
/// @notice The interface for AladdinCompounder like aCRV, aFXS, and is also EIP4646 compatible.
interface IAladdinCompounder {
  /// @notice Emitted when someone deposits asset into this contract.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param sender The address who sends underlying asset.
  /// @param owner The address who will receive the pool shares.
  /// @param assets The amount of asset deposited.
  /// @param shares The amounf of pool shares received.
  event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);

  /// @notice Emitted when someone withdraws asset from this contract.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param sender The address who call the function.
  /// @param receiver The address who will receive the assets.
  /// @param owner The address who owns the assets.
  /// @param assets The amount of asset withdrawn.
  /// @param shares The amounf of pool shares to withdraw.
  event Withdraw(
    address indexed sender,
    address indexed receiver,
    address indexed owner,
    uint256 assets,
    uint256 shares
  );

  /// @notice Emitted when someone harvests rewards.
  /// @param caller The address who call the function.
  /// @param recipient The address of account to recieve the harvest bounty.
  /// @param assets The total amount of underlying asset harvested.
  /// @param platformFee The amount of harvested assets as platform fee.
  /// @param harvestBounty The amount of harvested assets as harvest bounty.
  event Harvest(
    address indexed caller,
    address indexed recipient,
    uint256 assets,
    uint256 platformFee,
    uint256 harvestBounty
  );

  /// @notice Return the address of underlying assert.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  function asset() external view returns (address assetTokenAddress);

  /// @notice Return the total amount of underlying assert mananged by the contract.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  function totalAssets() external view returns (uint256 totalManagedAssets);

  /// @notice Return the amount of pool shares given the amount of asset.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param assets The amount of asset to convert.
  function convertToShares(uint256 assets) external view returns (uint256 shares);

  /// @notice Return the amount of asset given the amount of pool share.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param assets The amount of pool shares to convert.
  function convertToAssets(uint256 shares) external view returns (uint256 assets);

  /// @notice Return the maximum amount of asset that the user can deposit.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param receiver The address of user to receive the pool share.
  function maxDeposit(address receiver) external view returns (uint256 maxAssets);

  /// @notice Return the amount of pool shares will receive, if perform a deposit.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param assets The amount of asset to deposit.
  function previewDeposit(uint256 assets) external view returns (uint256 shares);

  /// @notice Deposit assets into this contract.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param assets The amount of asset to deposit.
  /// @param receiver The address of account who will receive the pool share.
  /// @return shares The amount of pool shares received.
  function deposit(uint256 assets, address receiver) external returns (uint256 shares);

  /// @notice Return the maximum amount of pool shares that the user can mint.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param receiver The address of user to receive the pool share.
  function maxMint(address receiver) external view returns (uint256 maxShares);

  /// @notice Return the amount of assets needed, if perform a mint.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param shares The amount of pool shares to mint.
  function previewMint(uint256 shares) external view returns (uint256 assets);

  /// @notice Mint pool shares from this contract.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param shares The amount of pool shares to mint.
  /// @param receiver The address of account who will receive the pool share.
  /// @return assets The amount of assets deposited to the contract.
  function mint(uint256 shares, address receiver) external returns (uint256 assets);

  /// @notice Return the maximum amount of assets that the user can withdraw.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param owner The address of user to withdraw from.
  function maxWithdraw(address owner) external view returns (uint256 maxAssets);

  /// @notice Return the amount of shares needed, if perform a withdraw.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param assets The amount of assets to withdraw.
  function previewWithdraw(uint256 assets) external view returns (uint256 shares);

  /// @notice Withdraw assets from this contract.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param assets The amount of assets to withdraw.
  /// @param receiver The address of account who will receive the assets.
  /// @param owner The address of user to withdraw from.
  /// @return shares The amount of pool shares burned.
  function withdraw(
    uint256 assets,
    address receiver,
    address owner
  ) external returns (uint256 shares);

  /// @notice Return the maximum amount of pool shares that the user can redeem.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param owner The address of user to redeem from.
  function maxRedeem(address owner) external view returns (uint256 maxShares);

  /// @notice Return the amount of assets to be received, if perform a redeem.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param shares The amount of pool shares to redeem.
  function previewRedeem(uint256 shares) external view returns (uint256 assets);

  /// @notice Redeem assets from this contract.
  /// @dev See https://eips.ethereum.org/EIPS/eip-4626
  /// @param shares The amount of pool shares to burn.
  /// @param receiver The address of account who will receive the assets.
  /// @param owner The address of user to withdraw from.
  /// @return assets The amount of assets withdrawn.
  function redeem(
    uint256 shares,
    address receiver,
    address owner
  ) external returns (uint256 assets);

  /// @notice Harvest rewards and convert to underlying asset.
  /// @param recipient The address of account to recieve the harvest bounty.
  /// @param minAssets The minimum amount of underlying asset harvested.
  /// @return assets The total amount of underlying asset harvested.
  function harvest(address recipient, uint256 minAssets) external returns (uint256 assets);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

interface IAladdinCRV is IERC20Upgradeable {
  event Harvest(address indexed _caller, uint256 _amount);
  event Deposit(address indexed _sender, address indexed _recipient, uint256 _amount);
  event Withdraw(
    address indexed _sender,
    address indexed _recipient,
    uint256 _shares,
    IAladdinCRV.WithdrawOption _option
  );

  event UpdateWithdrawalFeePercentage(uint256 _feePercentage);
  event UpdatePlatformFeePercentage(uint256 _feePercentage);
  event UpdateHarvestBountyPercentage(uint256 _percentage);
  event UpdatePlatform(address indexed _platform);

  enum WithdrawOption {
    // withdraw as cvxCRV
    Withdraw,
    // withdraw as cvxCRV staking wrapper
    WithdrawAndStake,
    // withdraw as CRV
    WithdrawAsCRV,
    // withdraw as CVX
    WithdrawAsCVX,
    // withdraw as ETH
    WithdrawAsETH
  }

  /// @notice return the total amount of cvxCRV staked.
  function totalUnderlying() external view returns (uint256);

  /// @notice return the amount of cvxCRV staked for user
  /// @param _user - The address of the account
  function balanceOfUnderlying(address _user) external view returns (uint256);

  /// @notice Deposit cvxCRV token to this contract
  /// @param _recipient - The address who will receive the aCRV token.
  /// @param _amount - The amount of cvxCRV to deposit.
  /// @return share - The amount of aCRV received.
  function deposit(address _recipient, uint256 _amount) external returns (uint256 share);

  /// @notice Deposit all cvxCRV token of the sender to this contract
  /// @param _recipient The address who will receive the aCRV token.
  /// @return share - The amount of aCRV received.
  function depositAll(address _recipient) external returns (uint256 share);

  /// @notice Deposit CRV token to this contract
  /// @param _recipient - The address who will receive the aCRV token.
  /// @param _amount - The amount of CRV to deposit.
  /// @return share - The amount of aCRV received.
  function depositWithCRV(address _recipient, uint256 _amount) external returns (uint256 share);

  /// @notice Deposit all CRV token of the sender to this contract
  /// @param _recipient The address who will receive the aCRV token.
  /// @return share - The amount of aCRV received.
  function depositAllWithCRV(address _recipient) external returns (uint256 share);

  /// @notice Withdraw cvxCRV in proportion to the amount of shares sent
  /// @param _recipient - The address who will receive the withdrawn token.
  /// @param _shares - The amount of aCRV to send.
  /// @param _minimumOut - The minimum amount of token should be received.
  /// @param _option - The withdraw option (as cvxCRV or CRV or CVX or ETH or stake to convex).
  /// @return withdrawn - The amount of token returned to the user.
  function withdraw(
    address _recipient,
    uint256 _shares,
    uint256 _minimumOut,
    WithdrawOption _option
  ) external returns (uint256 withdrawn);

  /// @notice Withdraw all cvxCRV in proportion to the amount of shares sent
  /// @param _recipient - The address who will receive the withdrawn token.
  /// @param _minimumOut - The minimum amount of token should be received.
  /// @param _option - The withdraw option (as cvxCRV or CRV or CVX or ETH or stake to convex).
  /// @return withdrawn - The amount of token returned to the user.
  function withdrawAll(
    address _recipient,
    uint256 _minimumOut,
    WithdrawOption _option
  ) external returns (uint256 withdrawn);

  /// @notice Harvest the pending reward and convert to cvxCRV.
  /// @param _recipient - The address of account to receive harvest bounty.
  /// @param _minimumOut - The minimum amount of cvxCRV should get.
  function harvest(address _recipient, uint256 _minimumOut) external returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;

interface IConcentratorStrategy {
  /// @notice Return then name of the strategy.
  function name() external view returns (string memory);

  /// @notice Update the list of reward tokens.
  /// @param _rewards The address list of reward tokens to update.
  function updateRewards(address[] memory _rewards) external;

  /// @notice Deposit token to corresponding strategy.
  /// @dev Requirements:
  ///   + Caller should make sure the token is already transfered into the strategy contract.
  ///   + Caller should make sure the deposit amount is greater than zero.
  ///
  /// @param _recipient The address of recipient who will receive the share.
  /// @param _amount The amount of token to deposit.
  function deposit(address _recipient, uint256 _amount) external;

  /// @notice Withdraw underlying token or yield token from corresponding strategy.
  /// @dev Requirements:
  ///   + Caller should make sure the withdraw amount is greater than zero.
  ///
  /// @param _recipient The address of recipient who will receive the token.
  /// @param _amount The amount of token to withdraw.
  function withdraw(address _recipient, uint256 _amount) external;

  /// @notice Harvest possible rewards from strategy.
  ///
  /// @param _zapper The address of zap contract used to zap rewards.
  /// @param _intermediate The address of intermediate token to zap.
  /// @return amount The amount of corresponding reward token.
  function harvest(address _zapper, address _intermediate) external returns (uint256 amount);

  /// @notice Emergency function to execute arbitrary call.
  /// @dev This function should be only used in case of emergency. It should never be called explicitly
  ///  in any contract in normal case.
  ///
  /// @param _to The address of target contract to call.
  /// @param _value The value passed to the target contract.
  /// @param _data The calldata pseed to the target contract.
  function execute(
    address _to,
    uint256 _value,
    bytes calldata _data
  ) external payable returns (bool, bytes memory);

  /// @notice Do some extra work before migration.
  /// @param _newStrategy The address of new strategy.
  function prepareMigrate(address _newStrategy) external;

  /// @notice Do some extra work after migration.
  /// @param _newStrategy The address of new strategy.
  function finishMigrate(address _newStrategy) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;

interface IConvexBasicRewards {
  function pid() external view returns (uint256);

  function totalSupply() external view returns (uint256);

  function periodFinish() external view returns (uint256);

  function rewardRate() external view returns (uint256);

  function stakingToken() external view returns (address);

  function stakeFor(address, uint256) external returns (bool);

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

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

  function withdrawAll(bool) external returns (bool);

  function withdraw(uint256, bool) external returns (bool);

  function withdrawAndUnwrap(uint256, bool) external returns (bool);

  function getReward() external returns (bool);

  function stake(uint256) external returns (bool);

  function rewardToken() external view returns (address);

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

interface IConvexCRVDepositor {
  function deposit(
    uint256 _amount,
    bool _lock,
    address _stakeAddress
  ) external;

  function deposit(uint256 _amount, bool _lock) external;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;

// solhint-disable var-name-mixedcase, func-name-mixedcase
interface ICurveFactoryPlainPool {
  function remove_liquidity_one_coin(
    uint256 token_amount,
    int128 i,
    uint256 min_amount
  ) external returns (uint256);

  function calc_withdraw_one_coin(uint256 _token_amount, int128 i) external view returns (uint256);

  function exchange(
    int128 i,
    int128 j,
    uint256 _dx,
    uint256 _min_dy,
    address _receiver
  ) external returns (uint256);

  function get_dy(
    int128 i,
    int128 j,
    uint256 dx
  ) external view returns (uint256);

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

  function balances(uint256 index) external view returns (uint256);

  function A_precise() external view returns (uint256);

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

/// @dev This is the interface of Curve Factory Plain Pool with 2 tokens, examples:
interface ICurveFactoryPlain2Pool is ICurveFactoryPlainPool {
  function add_liquidity(uint256[2] memory amounts, uint256 min_mint_amount) external returns (uint256);

  function calc_token_amount(uint256[2] memory amounts, bool _is_deposit) external view returns (uint256);
}

/// @dev This is the interface of Curve Factory Plain Pool with 3 tokens, examples:
interface ICurveFactoryPlain3Pool is ICurveFactoryPlainPool {
  function add_liquidity(uint256[3] memory amounts, uint256 min_mint_amount) external returns (uint256);

  function calc_token_amount(uint256[3] memory amounts, bool _is_deposit) external view returns (uint256);
}

/// @dev This is the interface of Curve Factory Plain Pool with 4 tokens, examples:
interface ICurveFactoryPlain4Pool is ICurveFactoryPlainPool {
  function add_liquidity(uint256[4] memory amounts, uint256 min_mint_amount) external returns (uint256);

  function calc_token_amount(uint256[4] memory amounts, bool _is_deposit) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;
pragma abicoder v2;

// solhint-disable func-name-mixedcase

interface ICvxCrvStakingWrapper {
  struct EarnedData {
    address token;
    uint256 amount;
  }

  function user_checkpoint(address _account) external returns (bool);

  // run earned as a mutable function to claim everything before calculating earned rewards
  function earned(address _account) external returns (EarnedData[] memory claimable);

  // set a user's reward weight to determine how much of each reward group to receive
  function setRewardWeight(uint256 _weight) external;

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

  // get user's weighted balance for specified reward group
  function userRewardBalance(address _address, uint256 _rewardGroup) external view returns (uint256);

  function userRewardWeight(address _address) external view returns (uint256);

  // get weighted supply for specified reward group
  function rewardSupply(uint256 _rewardGroup) external view returns (uint256);

  // claim
  function getReward(address _account) external;

  // claim and forward
  function getReward(address _account, address _forwardTo) external;

  // deposit vanilla crv
  function deposit(uint256 _amount, address _to) external;

  // stake cvxcrv
  function stake(uint256 _amount, address _to) external;

  // backwards compatibility for other systems (note: amount and address reversed)
  function stakeFor(address _to, uint256 _amount) external;

  // withdraw to convex deposit token
  function withdraw(uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;

interface IZap {
  function zap(
    address _fromToken,
    uint256 _amountIn,
    address _toToken,
    uint256 _minOut
  ) external payable returns (uint256);

  function zapWithRoutes(
    address _fromToken,
    uint256 _amountIn,
    address _toToken,
    uint256[] calldata _routes,
    uint256 _minOut
  ) external payable returns (uint256);

  function zapFrom(
    address _fromToken,
    uint256 _amountIn,
    address _toToken,
    uint256 _minOut
  ) external payable returns (uint256);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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IAladdinCRV.WithdrawOption","name":"_option","type":"uint8"}],"name":"withdrawAll","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawFeePercentage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"zap","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000971add32ea87f10bd192671630be3be8a11b8623000000000000000000000000aa0c3f5f7dfd688c6e646f66cd2a6b66acdbe434

-----Decoded View---------------
Arg [0] : _curveCvxCrvPool (address): 0x971add32Ea87f10bD192671630be3BE8A11b8623
Arg [1] : _wrapper (address): 0xaa0C3f5F7DFD688C6E646F66CD2a6B66ACdbE434

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000971add32ea87f10bd192671630be3be8a11b8623
Arg [1] : 000000000000000000000000aa0c3f5f7dfd688c6e646f66cd2a6b66acdbe434