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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { IERC20 } from "@openzeppelin/contracts-v4/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts-v4/token/ERC20/utils/SafeERC20.sol";

import { IConverterRegistry } from "../../helpers/converter/IConverterRegistry.sol";
import { ITokenConverter } from "../../helpers/converter/ITokenConverter.sol";

import { ConcentratorStrategyBaseV2 } from "./ConcentratorStrategyBaseV2.sol";

abstract contract AutoCompoundingStrategyBaseV2 is ConcentratorStrategyBaseV2 {
  using SafeERC20 for IERC20;

  function _harvest(
    address _converter,
    address _intermediate,
    address _target,
    address[] memory _rewards,
    uint256[] memory _amounts
  ) internal returns (uint256 _harvested) {
    address _registry = ITokenConverter(_converter).registry();

    // 1. convert all rewards to intermediate token.
    uint256 _imAmount;
    for (uint256 i = 0; i < rewards.length; i++) {
      address _rewardToken = _rewards[i];
      uint256 _amount = _amounts[i];
      if (_rewardToken == _target) {
        _harvested += _amount;
      } else if (_rewardToken == _intermediate) {
        _imAmount += _amount;
      } else if (_amount > 0) {
        _transferToken(_rewardToken, _converter, _amount);
        _imAmount += _convert(
          _converter,
          _amount,
          IConverterRegistry(_registry).getRoutes(_rewardToken, _intermediate),
          address(this)
        );
      }
    }

    // 2. add liquidity to staking token.
    if (_imAmount > 0) {
      _transferToken(_intermediate, _converter, _imAmount);
      _harvested += _convert(
        _converter,
        _imAmount,
        IConverterRegistry(_registry).getRoutes(_intermediate, _target),
        address(this)
      );
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { Ownable2Step } from "@openzeppelin/contracts-v4/access/Ownable2Step.sol";
import { Initializable } from "@openzeppelin/contracts-v4/proxy/utils/Initializable.sol";
import { IERC20 } from "@openzeppelin/contracts-v4/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts-v4/token/ERC20/utils/SafeERC20.sol";
import { Address } from "@openzeppelin/contracts-v4/utils/Address.sol";

import { IConcentratorStrategy } from "../interfaces/IConcentratorStrategy.sol";

// solhint-disable func-name-mixedcase
// solhint-disable no-empty-blocks

abstract contract ConcentratorStrategyBase is Initializable, Ownable2Step, IConcentratorStrategy {
  using SafeERC20 for IERC20;

  /**********
   * Errors *
   **********/

  /// @dev Thrown when the caller is not operator.
  error CallerIsNotOperator();

  /// @dev Thrown when sweep protected tokens.
  error TokenIsProtected();

  /// @dev Thrown when the reward tokens is zero address.
  error RewardTokenIsZero();

  /// @dev Thrown when the reward tokens are duplicated.
  error DuplicatedRewardToken();

  /*************
   * Variables *
   *************/

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

  /// @notice The list of rewards token.
  address[] public rewards;

  /// @notice The address of rewards stash contract..
  address public stash;

  /// @notice Mapping the address of token to the protected status.
  mapping(address => bool) public isTokenProtected;

  /// @dev reserved slots.
  uint256[46] private __gap;

  /*************
   * Modifiers *
   *************/

  modifier onlyOperator() {
    if (operator != _msgSender()) revert CallerIsNotOperator();
    _;
  }

  /***************
   * Constructor *
   ***************/

  function __ConcentratorStrategyBase_init(address _operator, address[] memory _rewards) internal onlyInitializing {
    _transferOwnership(_msgSender());

    _checkRewards(_rewards);

    operator = _operator;
    rewards = _rewards;
  }

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

  // fallback function to receive eth.
  receive() external payable {}

  /// @inheritdoc IConcentratorStrategy
  function updateRewards(address[] memory _rewards) public virtual override onlyOperator {
    _checkRewards(_rewards);

    delete rewards;
    rewards = _rewards;
  }

  /// @inheritdoc IConcentratorStrategy
  function execute(
    address _to,
    uint256 _value,
    bytes calldata _data
  ) external payable override onlyOperator returns (bool, bytes memory) {
    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory result) = _to.call{ value: _value }(_data);
    return (success, result);
  }

  /// @inheritdoc IConcentratorStrategy
  function prepareMigrate(address _newStrategy) external virtual override onlyOperator {}

  /// @inheritdoc IConcentratorStrategy
  function finishMigrate(address _newStrategy) external virtual override onlyOperator {}

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

  /// @notice Sweep non-protected tokens from this contract.
  ///
  /// @param _tokens The list of tokens to sweep.
  function sweepToken(address[] memory _tokens) external onlyOwner {
    for (uint256 i = 0; i < _tokens.length; i++) {
      if (isTokenProtected[_tokens[i]]) revert TokenIsProtected();
    }
    _sweepToken(_tokens);
  }

  /// @notice Update the address of stash contract.
  ///
  /// @param _newStash The address of new stash contract.
  function updateStash(address _newStash) external onlyOwner {
    stash = _newStash;
  }

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

  /// @dev Internal function to validate rewards list.
  /// @param _rewards The address list of reward tokens.
  function _checkRewards(address[] memory _rewards) internal pure {
    for (uint256 i = 0; i < _rewards.length; i++) {
      if (_rewards[i] == address(0)) revert RewardTokenIsZero();

      for (uint256 j = 0; j < i; j++) {
        if (_rewards[i] == _rewards[j]) revert DuplicatedRewardToken();
      }
    }
  }

  /// @dev Internal function to sweep tokens from this contract.
  ///
  /// @param _tokens The list of tokens to sweep.
  function _sweepToken(address[] memory _tokens) internal {
    address _stash = stash;
    for (uint256 i = 0; i < _tokens.length; i++) {
      address _token = _tokens[i];
      uint256 _balance = IERC20(_token).balanceOf(address(this));
      if (_balance > 0) {
        _transferToken(_token, _stash, _balance);
      }
    }
  }

  /// @dev Internal function to transfer ETH or ERC20 tokens to some `_receiver`.
  ///
  /// @param _token The address of token to transfer, user `_token=address(0)` if transfer ETH.
  /// @param _receiver The address of token receiver.
  /// @param _amount The amount of token to transfer.
  function _transferToken(
    address _token,
    address _receiver,
    uint256 _amount
  ) internal {
    if (_token == address(0)) {
      Address.sendValue(payable(_receiver), _amount);
    } else {
      IERC20(_token).safeTransfer(_receiver, _amount);
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { ITokenConverter } from "../../helpers/converter/ITokenConverter.sol";

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

abstract contract ConcentratorStrategyBaseV2 is ConcentratorStrategyBase {
  /// @dev Internal function to convert tokens, assuming the token is already in converter.
  ///
  /// @param _converter The address of converter.
  /// @param _amountIn The amount of token to convert.
  /// @param _routes The list of route encodings used for converting.
  /// @param _receiver The address of recipient of the converted tokens.
  /// @return _amountOut The amount of tokens converted.
  function _convert(
    address _converter,
    uint256 _amountIn,
    uint256[] memory _routes,
    address _receiver
  ) internal returns (uint256 _amountOut) {
    _amountOut = _amountIn;

    unchecked {
      uint256 _length = _routes.length;
      if (_length > 0) {
        _length -= 1;
        for (uint256 i = 0; i < _length; i++) {
          _amountOut = ITokenConverter(_converter).convert(_routes[i], _amountOut, _converter);
        }
        _amountOut = ITokenConverter(_converter).convert(_routes[_length], _amountOut, _receiver);
      }
    }
  }
}

// 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 =0.8.20;

import { IERC20 } from "@openzeppelin/contracts-v4/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts-v4/token/ERC20/utils/SafeERC20.sol";

import { IConvexVirtualBalanceRewardPool } from "../../interfaces/convex/IConvexVirtualBalanceRewardPool.sol";
import { ICvxRewardPool } from "../../interfaces/convex/ICvxRewardPool.sol";
import { IStashTokenWrapper } from "../../interfaces/convex/IStashTokenWrapper.sol";
import { IConvexBasicRewards } from "../../interfaces/IConvexBasicRewards.sol";
import { IConcentratorStrategy } from "../interfaces/IConcentratorStrategy.sol";

import { AutoCompoundingStrategyBaseV2 } from "../strategies/AutoCompoundingStrategyBaseV2.sol";

contract CvxStakingStrategy is AutoCompoundingStrategyBaseV2 {
  using SafeERC20 for IERC20;

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

  /// @inheritdoc IConcentratorStrategy
  // solhint-disable const-name-snakecase
  string public constant override name = "CvxStaking";

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

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

  /// @dev The address of cvxCRV staking pool.
  address private constant cvxCRVRewardPool = 0x3Fe65692bfCD0e6CF84cB1E7d24108E434A7587e;

  /// @notice The address of CvxRewardPool contract.
  address public immutable staker;

  /***************
   * Constructor *
   ***************/

  constructor(address _operator, address _staker) initializer {
    staker = _staker;

    address[] memory _rewards = new address[](1);
    _rewards[0] = cvxCRV;

    __ConcentratorStrategyBase_init(_operator, _rewards);

    // approval
    IERC20(CVX).safeApprove(_staker, type(uint256).max);

    // protect token
    isTokenProtected[CVX] = true;
    isTokenProtected[cvxCRV] = true;
  }

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

  /// @notice Sync reward tokens from CvxFxnStaking contract.
  function syncRewardToken() external {
    delete rewards;
    rewards.push(ICvxRewardPool(staker).rewardToken());

    uint256 _length = ICvxRewardPool(staker).extraRewardsLength();
    for (uint256 i = 0; i < _length; i++) {
      address _rewarder = ICvxRewardPool(staker).extraRewards(i);
      address _wrapper = IConvexVirtualBalanceRewardPool(_rewarder).rewardToken();
      rewards.push(IStashTokenWrapper(_wrapper).token());
    }
  }

  /// @inheritdoc IConcentratorStrategy
  function deposit(address, uint256 _amount) external override onlyOperator {
    if (_amount > 0) {
      ICvxRewardPool(staker).stake(_amount);
    }
  }

  /// @inheritdoc IConcentratorStrategy
  function withdraw(address _recipient, uint256 _amount) external override onlyOperator {
    if (_amount > 0) {
      ICvxRewardPool(staker).withdraw(_amount, false);
      IERC20(CVX).safeTransfer(_recipient, _amount);
    }
  }

  /// @inheritdoc IConcentratorStrategy
  function harvest(address _converter, address _intermediate)
    external
    override
    onlyOperator
    returns (uint256 _harvested)
  {
    // -1. withdraw cvxCRV from staking pool
    uint256 _balance = IConvexBasicRewards(cvxCRVRewardPool).balanceOf(address(this));
    if (_balance > 0) {
      // claim and sweep extra rewards
      IConvexBasicRewards(cvxCRVRewardPool).withdraw(_balance, true);
      address[] memory _extraRewards = new address[](3);
      _extraRewards[0] = 0xD533a949740bb3306d119CC777fa900bA034cd52; // CRV
      _extraRewards[1] = 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490; // 3CRV
      _extraRewards[2] = CVX;
      _sweepToken(_extraRewards);
    }

    // 0. sweep balances
    address[] memory _rewards = rewards;
    _sweepToken(_rewards);

    // 1. claim rewards from staking staker contract.
    ICvxRewardPool(staker).getReward(false);
    uint256[] memory _amounts = new uint256[](rewards.length);
    for (uint256 i = 0; i < rewards.length; i++) {
      _amounts[i] = IERC20(_rewards[i]).balanceOf(address(this));
    }

    // 2. convert all rewards to staking token.
    _harvested = _harvest(_converter, _intermediate, CVX, _rewards, _amounts);

    // 3. deposit into convex
    if (_harvested > 0) {
      ICvxRewardPool(staker).stake(_harvested);
    }
  }
}

// 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 IConverterRegistry {
  /**********
   * Events *
   **********/

  /// @notice Emitted when the converter route is updated.
  /// @param src The address of source token.
  /// @param dst The address of destination token.
  /// @param routes The list of route encodings.
  event UpdateRoute(address indexed src, address indexed dst, uint256[] routes);

  /// @notice Emitted when the token converter is updated for some pool type.
  /// @param poolType The pool type updated.
  /// @param oldConverter The address of previous converter.
  /// @param newConverter The address of current converter.
  event UpdateConverter(uint256 indexed poolType, address indexed oldConverter, address indexed newConverter);

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

  /// @notice Return the routes used to convert source token to destination token.
  /// @param src The address of source token.
  /// @param dst The address of destination token.
  /// @return routes The list of route encodings.
  function getRoutes(address src, address dst) external view returns (uint256[] memory routes);

  /// @notice Return the input token and output token for the route.
  /// @param route The encoding of the route.
  /// @return tokenIn The address of input token.
  /// @return tokenOut The address of output token.
  function getTokenPair(uint256 route) external view returns (address tokenIn, address tokenOut);

  /// @notice Return the address of converter for a specific pool type.
  /// @param poolType The type of converter.
  /// @return converter The address of converter.
  function getConverter(uint256 poolType) external view returns (address converter);
}

// 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 ^0.7.0 || ^0.8.0;

interface IConvexVirtualBalanceRewardPool {
  function rewardToken() external view returns (address);

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;

interface ICvxRewardPool {
  function getReward(
    address _account,
    bool _claimExtras,
    bool _stake
  ) external;

  function getReward(bool _stake) external;

  function withdrawAll(bool claim) external;

  function withdraw(uint256 _amount, bool claim) external;

  function stakeFor(address _for, uint256 _amount) external;

  function stakeAll() external;

  function stake(uint256 _amount) external;

  function totalSupply() external view returns (uint256);

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

  function rewardToken() external view returns (address);

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;

interface IStashTokenWrapper {
  function token() external view returns (address);

  function rewardPool() external view returns (address);

  function isInvalid() external view returns (bool);

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

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

  function decimals() external view returns (uint8);

  function totalSupply() external view returns (uint256);

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

  function transfer(address _recipient, uint256 _amount) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0 || ^0.8.0;

interface ITokenConverter {
  /*************************
   * Public View Functions *
   *************************/

  /// @notice The address of Converter Registry.
  function registry() external view returns (address);

  /// @notice Return the input token and output token for the route.
  /// @param route The encoding of the route.
  /// @return tokenIn The address of input token.
  /// @return tokenOut The address of output token.
  function getTokenPair(uint256 route) external view returns (address tokenIn, address tokenOut);

  /// @notice Query the output token amount according to the encoding.
  ///
  /// @dev See the comments in `convert` for the meaning of encoding.
  ///
  /// @param encoding The encoding used to convert.
  /// @param amountIn The amount of input token.
  /// @param amountOut The amount of output token received.
  function queryConvert(uint256 encoding, uint256 amountIn) external returns (uint256 amountOut);

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

  /// @notice Convert input token to output token according to the encoding.
  /// Assuming that the input token is already in the contract.
  ///
  /// @dev encoding for single route
  /// |   8 bits  | 2 bits |  246 bits  |
  /// | pool_type | action | customized |
  ///
  /// + pool_type = 0: UniswapV2, only action = 0
  ///   customized = |   160 bits   | 24 bits |     1 bit    | 1 bit | ... |
  ///                | pool address | fee_num | zero_for_one | twamm | ... |
  /// + pool_type = 1: UniswapV3, only action = 0
  ///   customized = |   160 bits   | 24 bits |     1 bit    | ... |
  ///                | pool address | fee_num | zero_for_one | ... |
  /// + pool_type = 2: BalancerV1, only action = 0
  ///   customized = |   160 bits   | 3 bits |  3 bits  |   3 bits  | ... |
  ///                | pool address | tokens | index in | index out | ... |
  /// + pool_type = 3: BalancerV2, only action = 0
  ///   customized = |   160 bits   | 3 bits |  3 bits  |   3 bits  | ... |
  ///                | pool address | tokens | index in | index out | ... |
  /// + pool_type = 4: CurvePlainPool or CurveFactoryPlainPool
  ///   customized = |   160 bits   | 3 bits |  3 bits  |   3 bits  |  1 bit  | ... |
  ///                | pool address | tokens | index in | index out | use_eth | ... |
  /// + pool_type = 5: CurveAPool
  ///   customized = |   160 bits   | 3 bits |  3 bits  |   3 bits  |     1 bits     | ... |
  ///                | pool address | tokens | index in | index out | use_underlying | ... |
  /// + pool_type = 6: CurveYPool
  ///   customized = |   160 bits   | 3 bits |  3 bits  |   3 bits  |     1 bits     | ... |
  ///                | pool address | tokens | index in | index out | use_underlying | ... |
  /// + pool_type = 7: CurveMetaPool or CurveFactoryMetaPool
  ///   customized = |   160 bits   | 3 bits |  3 bits  |   3 bits  | ... |
  ///                | pool address | tokens | index in | index out | ... |
  /// + pool_type = 8: CurveCryptoPool or CurveFactoryCryptoPool
  ///   customized = |   160 bits   | 3 bits |  3 bits  |   3 bits  |  1 bit  | ... |
  ///                | pool address | tokens | index in | index out | use_eth | ... |
  /// + pool_type = 9: ERC4626, no action 0
  ///   customized = |   160 bits   | ... |
  ///                | pool address | ... |
  /// + pool_type = 10: Lido, no action 0
  ///   customized = |   160 bits   | ... |
  ///                | pool address | ... |
  ///
  /// Note: tokens + 1 is the number of tokens of the pool
  ///
  /// + action = 0: swap
  /// + action = 1: add liquidity / wrap / stake
  /// + action = 2: remove liquidity / unwrap / unstake
  ///
  /// @param encoding The encoding used to convert.
  /// @param amountIn The amount of input token.
  /// @param recipient The address of token receiver.
  /// @return amountOut The amount of output token received.
  function convert(
    uint256 encoding,
    uint256 amountIn,
    address recipient
  ) external payable returns (uint256 amountOut);

  /// @notice Withdraw dust assets in this contract.
  /// @param token The address of token to withdraw.
  /// @param recipient The address of token receiver.
  function withdrawFund(address token, address recipient) external;
}

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

pragma solidity ^0.8.2;

import "../../utils/Address.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 proxied contracts do not make use of 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.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * 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 prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

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

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * 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 Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

{
  "compilationTarget": {
    "contracts/concentrator/cvx/CvxStakingStrategy.sol": "CvxStakingStrategy"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}