// File: contracts/ethereum/CurveConvex/CurveFraxConvexStrategy.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/interfaces/IERC20.sol";

import "./../../IAlluoStrategy.sol";
import "./interfaces/ICvxBooster.sol";
import "./interfaces/ICvxBaseRewardPool.sol";
import "../../mock/IWrappedEther.sol";
import "../../interfaces/IExchange.sol";
import "./interfaces/IFraxFarmERC20.sol";
import "./interfaces/IConvexWrapper.sol";

contract CurveFraxConvexStrategy is AccessControl, IAlluoStrategy {
    using Address for address;
    using SafeERC20 for IERC20;
    event Locked(bytes32 data);

    ICvxBooster public constant cvxBooster =
        ICvxBooster(0xF403C135812408BFbE8713b5A23a04b3D48AAE31);
    IExchange public constant exchange =
        IExchange(0x29c66CF57a03d41Cfe6d9ecB6883aa0E2AbA21Ec);
    IERC20 public constant cvxRewards =
        IERC20(0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B);
    IERC20 public constant crvRewards =
        IERC20(0xD533a949740bb3306d119CC777fa900bA034cd52);
    IERC20 public constant fraxRewards = 
        IERC20(0x3432B6A60D23Ca0dFCa7761B7ab56459D9C964D0);
    uint8 public constant unwindDecimals = 2;

    receive() external payable {
    }

    constructor(
        address voteExecutor,
        address gnosis,
        bool isTesting
    ) {
        if (isTesting) _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        else {
            require(
                voteExecutor.isContract(),
                "CurveConvexStrategy: 1!contract"
            );
            require(gnosis.isContract(), "CurveConvexStrategy: 2!contract");
            _grantRole(DEFAULT_ADMIN_ROLE, gnosis);
            _grantRole(DEFAULT_ADMIN_ROLE, voteExecutor);
        }
    }

    function invest(bytes calldata data, uint256 amount)
        external
        onlyRole(DEFAULT_ADMIN_ROLE)
        returns (bytes memory)
    {
        (
            address curvePool,
            IERC20 crvLpToken,
            IERC20 poolToken,
            uint8 poolSize,
            uint8 tokenIndexInCurve,
            uint256 poolId,
            IERC20 stakeToken, 
            address fraxPool,
            uint256 duration
        ) = decodeEntryParams(data);
        poolToken.safeIncreaseAllowance(curvePool, amount);
        // prepare amounts array for curve
        uint256[4] memory fourPoolTokensAmount;
        fourPoolTokensAmount[tokenIndexInCurve] = amount;

        // encode call to curve - this ugly code handles different curve pool
        // sizes and function selectors
        bytes memory curveCall;
        if (poolSize == 2) {
            curveCall = abi.encodeWithSelector(
                0x0b4c7e4d,
                uint256[2]([fourPoolTokensAmount[0], fourPoolTokensAmount[1]]),
                0
            );
        } else if (poolSize == 3) {
            curveCall = abi.encodeWithSelector(
                0x4515cef3,
                uint256[3](
                    [
                        fourPoolTokensAmount[0],
                        fourPoolTokensAmount[1],
                        fourPoolTokensAmount[2]
                    ]
                ),
                0
            );
        } else {
            curveCall = abi.encodeWithSelector(
                0x029b2f34,
                fourPoolTokensAmount,
                0
            );
        }

        // execute call
        curvePool.functionCall(curveCall);
        bytes32 kek_id;
        // skip investment in convex, if poolId is uint256 max value
        if (poolId != type(uint256).max) {
            // invest tokens to convex
            uint256 crvLpAmount = crvLpToken.balanceOf(address(this));
            crvLpToken.safeIncreaseAllowance(address(stakeToken), crvLpAmount);
            // Deposit these crvLptokens into the convex wrapper to get staked fraxLP tokens
            IConvexWrapper(address(stakeToken)).deposit(crvLpAmount, address(this));
            uint256 fraxLpAmount = stakeToken.balanceOf(address(this));
            stakeToken.safeIncreaseAllowance(fraxPool, fraxLpAmount);
            // Now stake and lock these LP tokens into the frax farm.
            kek_id = IFraxFarmERC20(fraxPool).stakeLocked(fraxLpAmount, duration);
        }
        emit Locked(kek_id);

        return
            encodeExitParams(
                curvePool,
                address(poolToken),
                address(crvLpToken),
                tokenIndexInCurve,
                poolId,
                address(fraxPool),
                kek_id
            );
    }

    function exitAll(
        bytes calldata data,
        uint256 unwindPercent,
        address outputCoin,
        address receiver,
        bool swapRewards
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        (
            address curvePool,
            IERC20 poolToken,
            IERC20 crvLpToken,
            uint8 tokenIndexInCurve,
            uint256 convexPoolId,
            address fraxPool,
            bytes32 kek_id
        ) = decodeExitParams(data);
        uint256 lpAmount;
        if (convexPoolId != type(uint256).max) {
            // Withdraw locked fraxLP tokens.
            // Get all rewards accumulated.

            address[] memory fraxPoolRewards = IFraxFarmERC20(fraxPool).getAllRewardTokens();
            IFraxFarmERC20(fraxPool).withdrawLocked(kek_id, address(this));
            // Get rewards from Frax
            IFraxFarmERC20(fraxPool).getReward(address(this));
            // Get rewards from Convex
            IConvexWrapper(IFraxFarmERC20(fraxPool).stakingToken()).getReward(address(this));

            // Simply send all frax rewards to receiver.
            for (uint256 i; i < fraxPoolRewards.length; i++) {
                IERC20(fraxPoolRewards[i]).transfer(receiver, IERC20(fraxPoolRewards[i]).balanceOf(address(this)));
            }
            // Withdraw all the curveLPs and curve rewards.
            lpAmount =
                ( IERC20(IFraxFarmERC20(fraxPool).stakingToken()).balanceOf(address(this)) * unwindPercent) /
                (10**(2 + unwindDecimals));

            IConvexWrapper(IFraxFarmERC20(fraxPool).stakingToken()).withdrawAndUnwrap(lpAmount);
        } else {
            lpAmount = crvLpToken.balanceOf(address(this)) * unwindPercent / 10000;
        }

        if (lpAmount == 0) return;

        // exit with coin that we used for entry
        bytes memory curveCall = abi.encodeWithSignature(
            "remove_liquidity_one_coin(uint256,int128,uint256)",
            lpAmount,
            tokenIndexInCurve,
            0
        );
        curvePool.functionCall(curveCall);
        // execute exchanges and transfer all tokens to receiver
        exchangeAll(poolToken, IERC20(outputCoin));
        manageRewardsAndWithdraw(swapRewards, IERC20(outputCoin), receiver);
    }

    function exitOnlyRewards(
        bytes calldata data,
        address outputCoin,
        address receiver,
        bool swapRewards
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {

        (
            ,
            ,
            ,
            ,
            uint256 convexPoolId,
            address fraxPool,
        ) = decodeExitParams(data);
        if (convexPoolId != type(uint256).max) {
            // Withdraw locked fraxLP tokens.
            // Get all rewards accumulated.
            address[] memory fraxPoolRewards = IFraxFarmERC20(fraxPool).getAllRewardTokens();
            // Get rewards from Frax
            IFraxFarmERC20(fraxPool).getReward(address(this));
            // Get rewards from Convex
            IConvexWrapper(IFraxFarmERC20(fraxPool).stakingToken()).getReward(address(this), address(this));
            // Simply send all rewards to receiver.
            for (uint256 i; i < fraxPoolRewards.length; i++) {
                IERC20(fraxPoolRewards[i]).transfer(receiver, IERC20(fraxPoolRewards[i]).balanceOf(address(this)));
            }
        } else {
            ICvxBaseRewardPool rewards = getCvxRewardPool(convexPoolId);
            rewards.getReward(address(this), true);
        }
        manageRewardsAndWithdraw(swapRewards, IERC20(outputCoin), receiver);
    }
    function multicall(
        address[] calldata destinations,
        bytes[] calldata calldatas
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        uint256 length = destinations.length;
        require(length == calldatas.length, "CurveConvexStrategy: lengths");
        for (uint256 i = 0; i < length; i++) {
            destinations[i].functionCall(calldatas[i]);
        }
    }

    function encodeEntryParams(
        address curvePool,
        address crvLpToken,
        address poolToken,
        uint8 poolSize,
        uint8 tokenIndexInCurve,
        uint256 convexPoolId,
        address stakeToken,
        address fraxPool,
        uint256 duration
    ) external pure returns (bytes memory) {
        return
            abi.encode(
                curvePool,
                crvLpToken,
                poolToken,
                poolSize,
                tokenIndexInCurve,
                convexPoolId,
                stakeToken, 
                fraxPool,
                duration
            );
    }

    function encodeExitParams(
        address curvePool,
        address poolToken,
        address crvLpToken,
        uint8 tokenIndexInCurve,
        uint256 convexPoolId,
        address fraxPool,
        bytes32 kek
    ) public pure returns (bytes memory) {
        return
            abi.encode(
                curvePool,
                poolToken,
                crvLpToken,
                tokenIndexInCurve,
                convexPoolId,
                fraxPool,
                kek
            );
    }

    function decodeEntryParams(bytes calldata data)
        public
        pure
        returns (
            address,
            IERC20,
            IERC20,
            uint8,
            uint8,
            uint256,
            IERC20,
            address,
            uint256
        )
    {
        require(data.length == 32 * 9, "CurveConvexStrategy: length en");
        return
            abi.decode(data, (address, IERC20, IERC20, uint8, uint8, uint256, IERC20, address, uint256));
    }

    function decodeExitParams(bytes calldata data)
        public
        pure
        returns (
            address,
            IERC20,
            IERC20,
            uint8,
            uint256,
            address,
            bytes32
        )
    {
        require(data.length == 32 * 7, "CurveConvexStrategy: length ex");
        return abi.decode(data, (address, IERC20, IERC20, uint8, uint256, address,bytes32));
    }

    function exchangeAll(IERC20 fromCoin, IERC20 toCoin) private {
        if (fromCoin == toCoin) return;
        uint256 amount = IERC20(fromCoin).balanceOf(address(this));
        if (amount == 0) return;

        fromCoin.safeApprove(address(exchange), amount);
        exchange.exchange(address(fromCoin), address(toCoin), amount, 0);
    }

    function manageRewardsAndWithdraw(
        bool swapRewards,
        IERC20 outputCoin,
        address receiver
    ) private {
        if (swapRewards) {
            exchangeAll(cvxRewards, outputCoin);
            exchangeAll(crvRewards, outputCoin);
        } else {
            cvxRewards.safeTransfer(
                receiver,
                cvxRewards.balanceOf(address(this))
            );

            crvRewards.safeTransfer(
                receiver,
                crvRewards.balanceOf(address(this))
            );
        }

        outputCoin.safeTransfer(receiver, outputCoin.balanceOf(address(this)));
    }

    function getCvxRewardPool(uint256 poolId)
        private
        view
        returns (ICvxBaseRewardPool)
    {
        (, , , address pool, , ) = cvxBooster.poolInfo(poolId);
        return ICvxBaseRewardPool(pool);
    }
}
// File: @openzeppelin/contracts/access/AccessControl.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



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

pragma solidity ^0.8.0;

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

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

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

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

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

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

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/interfaces/IERC20.sol



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

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

// File: contracts/IAlluoStrategy.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

interface IAlluoStrategy {
    /// @notice Invest tokens transferred to this contract.
    /// @dev Amount of tokens specified in `amount` is guranteed to be
    /// transferred to strategy by vote executor.
    /// @param data whatever data you want to pass to strategy from vote extry.
    /// @param amount amount of your tokens that will be invested.
    /// @return data that MUST be passed in exiting functions
    function invest(bytes calldata data, uint256 amount)
        external
        returns (bytes memory);

    /// @notice Uninvest value and tranfer exchanged value to receiver.
    /// @param data whatever data you want to pass to strategy from vote extry.
    /// @param unwindPercent percentage of available assets to be released with 2 decimal points.
    /// @param outputCoin address of token that strategy MUST return.
    /// @param receiver address where tokens should go.
    /// @param swapRewards true if rewards are needed to swap to `outputCoin`, false otherwise.
    function exitAll(
        bytes calldata data,
        uint256 unwindPercent,
        address outputCoin,
        address receiver,
        bool swapRewards
    ) external;

    /// @notice Claim available rewards.
    /// @param data whatever data you want to pass to strategy from vote extry.
    /// @param outputCoin address of token that strategy MUST return (if swapRewards is true).
    /// @param receiver address where tokens should go.
    /// @param swapRewards true if rewards are needed to swap to `outputCoin`, false otherwise.
    function exitOnlyRewards(
        bytes calldata data,
        address outputCoin,
        address receiver,
        bool swapRewards
    ) external;

    /// @notice Execute any action on behalf of strategy.
    /// @dev Regular call is executed. If any of extcall fails, transaction should revert.
    /// @param destinations addresses to call
    /// @param calldatas calldatas to execute
    function multicall(
        address[] calldata destinations,
        bytes[] calldata calldatas
    ) external;
}

// File: contracts/ethereum/CurveConvex/interfaces/ICvxBooster.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

// Interface from ABI of
// https://etherscan.io/address/0xF403C135812408BFbE8713b5A23a04b3D48AAE31
// Built with https://bia.is/tools/abi2solidity/

// solhint-disable func-name-mixedcase

interface ICvxBooster {
    function FEE_DENOMINATOR() external view returns (uint256);

    function MaxFees() external view returns (uint256);

    function addPool(
        address _lptoken,
        address _gauge,
        uint256 _stashVersion
    ) external returns (bool);

    function claimRewards(uint256 _pid, address _gauge) external returns (bool);

    function crv() external view returns (address);

    function deposit(
        uint256 _pid,
        uint256 _amount,
        bool _stake
    ) external returns (bool);

    function depositAll(uint256 _pid, bool _stake) external returns (bool);

    function distributionAddressId() external view returns (uint256);

    function earmarkFees() external returns (bool);

    function earmarkIncentive() external view returns (uint256);

    function earmarkRewards(uint256 _pid) external returns (bool);

    function feeDistro() external view returns (address);

    function feeManager() external view returns (address);

    function feeToken() external view returns (address);

    function gaugeMap(address) external view returns (bool);

    function isShutdown() external view returns (bool);

    function lockFees() external view returns (address);

    function lockIncentive() external view returns (uint256);

    function lockRewards() external view returns (address);

    function minter() external view returns (address);

    function owner() external view returns (address);

    function platformFee() external view returns (uint256);

    function poolInfo(uint256)
        external
        view
        returns (
            address lptoken,
            address token,
            address gauge,
            address crvRewards,
            address stash,
            bool shutdown
        );

    function poolLength() external view returns (uint256);

    function poolManager() external view returns (address);

    function registry() external view returns (address);

    function rewardArbitrator() external view returns (address);

    function rewardClaimed(
        uint256 _pid,
        address _address,
        uint256 _amount
    ) external returns (bool);

    function rewardFactory() external view returns (address);

    function setArbitrator(address _arb) external;

    function setFactories(
        address _rfactory,
        address _sfactory,
        address _tfactory
    ) external;

    function setFeeInfo() external;

    function setFeeManager(address _feeM) external;

    function setFees(
        uint256 _lockFees,
        uint256 _stakerFees,
        uint256 _callerFees,
        uint256 _platform
    ) external;

    function setGaugeRedirect(uint256 _pid) external returns (bool);

    function setOwner(address _owner) external;

    function setPoolManager(address _poolM) external;

    function setRewardContracts(address _rewards, address _stakerRewards)
        external;

    function setTreasury(address _treasury) external;

    function setVoteDelegate(address _voteDelegate) external;

    function shutdownPool(uint256 _pid) external returns (bool);

    function shutdownSystem() external;

    function staker() external view returns (address);

    function stakerIncentive() external view returns (uint256);

    function stakerRewards() external view returns (address);

    function stashFactory() external view returns (address);

    function tokenFactory() external view returns (address);

    function treasury() external view returns (address);

    function vote(
        uint256 _voteId,
        address _votingAddress,
        bool _support
    ) external returns (bool);

    function voteDelegate() external view returns (address);

    function voteGaugeWeight(address[] memory _gauge, uint256[] memory _weight)
        external
        returns (bool);

    function voteOwnership() external view returns (address);

    function voteParameter() external view returns (address);

    function withdraw(uint256 _pid, uint256 _amount) external returns (bool);

    function withdrawAll(uint256 _pid) external returns (bool);

    function withdrawTo(
        uint256 _pid,
        uint256 _amount,
        address _to
    ) external returns (bool);
}

// File: contracts/ethereum/CurveConvex/interfaces/ICvxBaseRewardPool.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

// Interface from ABI of
// https://etherscan.io/address/0xB900EF131301B307dB5eFcbed9DBb50A3e209B2e
// Built with https://bia.is/tools/abi2solidity/

interface ICvxBaseRewardPool {
    function addExtraReward(address _reward) external returns (bool);

    function balanceOf(address account) external view returns (uint256);

    function clearExtraRewards() external;

    function currentRewards() external view returns (uint256);

    function donate(uint256 _amount) external returns (bool);

    function duration() external view returns (uint256);

    function earned(address account) external view returns (uint256);

    function extraRewards(uint256) external view returns (address);

    function extraRewardsLength() external view returns (uint256);

    function getReward() external returns (bool);

    function getReward(address _account, bool _claimExtras)
        external
        returns (bool);

    function historicalRewards() external view returns (uint256);

    function lastTimeRewardApplicable() external view returns (uint256);

    function lastUpdateTime() external view returns (uint256);

    function newRewardRatio() external view returns (uint256);

    function operator() external view returns (address);

    function periodFinish() external view returns (uint256);

    function pid() external view returns (uint256);

    function queueNewRewards(uint256 _rewards) external returns (bool);

    function queuedRewards() external view returns (uint256);

    function rewardManager() external view returns (address);

    function rewardPerToken() external view returns (uint256);

    function rewardPerTokenStored() external view returns (uint256);

    function rewardRate() external view returns (uint256);

    function rewardToken() external view returns (address);

    function rewards(address) external view returns (uint256);

    function stake(uint256 _amount) external returns (bool);

    function stakeAll() external returns (bool);

    function stakeFor(address _for, uint256 _amount) external returns (bool);

    function stakingToken() external view returns (address);

    function totalSupply() external view returns (uint256);

    function userRewardPerTokenPaid(address) external view returns (uint256);

    function withdraw(uint256 amount, bool claim) external returns (bool);

    function withdrawAll(bool claim) external;

    function withdrawAllAndUnwrap(bool claim) external;

    function withdrawAndUnwrap(uint256 amount, bool claim)
        external
        returns (bool);
}

// File: contracts/mock/IWrappedEther.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.14;

interface IWrappedEther {
    function name() external view returns (string memory);

    function approve(address guy, uint256 wad) external returns (bool);

    function totalSupply() external view returns (uint256);

    function transferFrom(
        address src,
        address dst,
        uint256 wad
    ) external returns (bool);

    function withdraw(uint256 wad) external;

    function decimals() external view returns (uint8);

    function balanceOf(address) external view returns (uint256);

    function symbol() external view returns (string memory);

    function transfer(address dst, uint256 wad) external returns (bool);

    function deposit() external payable;

    function allowance(address, address) external view returns (uint256);
}
// File: contracts/interfaces/IExchange.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

interface IExchange {
    struct RouteEdge {
        uint32 swapProtocol; // 0 - unknown edge, 1 - UniswapV2, 2 - Curve...
        address pool; // address of pool to call
        address fromCoin; // address of coin to deposit to pool
        address toCoin; // address of coin to get from pool
    }
    struct LpToken {
        uint32 swapProtocol; // 0 - unknown edge, 1 - UniswapV2, 2 - Curve...
        address pool; // address of pool to call
    }
    function exchange(
        address from,
        address to,
        uint256 amountIn,
        uint256 minAmountOut
    ) external payable returns (uint256);

    function createInternalMajorRoutes(RouteEdge[][] calldata routes) external;
    function createLpToken(
        LpToken[] calldata edges,
        address[] calldata lpTokensAddress,
        address[][] calldata entryCoins
    ) external;

    function createApproval(
        address[] calldata coins,
        address[] calldata spenders
    ) external;
    function registerAdapters(
        address[] calldata adapters_,
        uint32[] calldata protocolId
    ) external;
    function createMinorCoinEdge(RouteEdge[] calldata edges) external;

}

// File: contracts/ethereum/CurveConvex/interfaces/IFraxFarmERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;
interface IFraxFarmERC20 {
    
    struct LockedStake {
        bytes32 kek_id;
        uint256 start_timestamp;
        uint256 liquidity;
        uint256 ending_timestamp;
        uint256 lock_multiplier; // 6 decimals of precision. 1x = 1000000
    }

   struct EarnedData {
        address token;
        uint256 amount;
    }
    function earned() external view returns(EarnedData[] memory claimable);
    function rewardLength() external view returns(uint256);

    function owner() external view returns (address);
    function stakingToken() external view returns (address);
    function fraxPerLPToken() external view returns (uint256);
    function calcCurCombinedWeight(address account) external view
        returns (
            uint256 old_combined_weight,
            uint256 new_vefxs_multiplier,
            uint256 new_combined_weight
        );
    function lockedStakesOf(address account) external view returns (LockedStake[] memory);
    function lockedStakesOfLength(address account) external view returns (uint256);
    function lockAdditional(bytes32 kek_id, uint256 addl_liq) external;
    function lockLonger(bytes32 kek_id, uint256 new_ending_ts) external;
    function stakeLocked(uint256 liquidity, uint256 secs) external returns (bytes32);
    function withdrawLocked(bytes32 kek_id, address destination_address) external returns (uint256);
    function withdrawLocked(bytes32 kek_id) external returns (uint256);



    function periodFinish() external view returns (uint256);
    function getAllRewardTokens() external view returns (address[] memory);
    // function earned(address account) external view returns (uint256[] memory new_earned);
    function totalLiquidityLocked() external view returns (uint256);
    function lockedLiquidityOf(address account) external view returns (uint256);
    function totalCombinedWeight() external view returns (uint256);
    function combinedWeightOf(address account) external view returns (uint256);
    function lockMultiplier(uint256 secs) external view returns (uint256);
    function rewardRates(uint256 token_idx) external view returns (uint256 rwd_rate);

    function userStakedFrax(address account) external view returns (uint256);
    function proxyStakedFrax(address proxy_address) external view returns (uint256);
    function maxLPForMaxBoost(address account) external view returns (uint256);
    function minVeFXSForMaxBoost(address account) external view returns (uint256);
    function minVeFXSForMaxBoostProxy(address proxy_address) external view returns (uint256);
    function veFXSMultiplier(address account) external view returns (uint256 vefxs_multiplier);

    function toggleValidVeFXSProxy(address proxy_address) external;
    function proxyToggleStaker(address staker_address) external;
    function stakerSetVeFXSProxy(address proxy_address) external;
    function getReward(address destination_address) external returns (uint256[] memory);
    function getReward(bool claim) external returns (uint256[] memory);

    function vefxs_max_multiplier() external view returns(uint256);
    function vefxs_boost_scale_factor() external view returns(uint256);
    function vefxs_per_frax_for_max_boost() external view returns(uint256);
    function getProxyFor(address addr) external view returns (address);

    function sync() external;
}
// File: contracts/ethereum/CurveConvex/interfaces/IConvexWrapper.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;


interface IConvexWrapper{

   struct EarnedData {
        address token;
        uint256 amount;
    }

  function convexPoolId() external view returns(uint256 _poolId);
  function balanceOf(address _account) external view returns(uint256);
  function totalBalanceOf(address _account) external view returns(uint256);
  function deposit(uint256 _amount, address _to) external;
  function stake(uint256 _amount, address _to) external;
  function withdraw(uint256 _amount) external;
  function withdrawAndUnwrap(uint256 _amount) external;
  function getReward(address _account) external;
  function getReward(address _account, address _forwardTo) external;
  function rewardLength() external view returns(uint256);
  function earned(address _account) external view returns(EarnedData[] memory claimable);
  function setVault(address _vault) external;
  function user_checkpoint(address[2] calldata _accounts) external returns(bool);
  function createVault(uint256 _pid) external returns (address);
   function stakeLockedCurveLp(uint256 _liquidity, uint256 _secs) external returns (bytes32 kek_id);
   function withdrawLockedAndUnwrap(bytes32 _kek_id) external;
   function getReward() external;
   function owner() external view returns (address);
   function rewards(uint256) external view returns (address, address, uint128, uint128);
}
// File: @openzeppelin/contracts/access/IAccessControl.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// File: @openzeppelin/contracts/utils/Context.sol



// 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;
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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