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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol";

contract Flake is Initializable, OwnableUpgradeable, ReentrancyGuardUpgradeable {
    using SafeERC20 for IERC20;

    event SwapExecuted(address indexed user, address tokenIn, address tokenOut, uint256 amountIn);
    event EthRefundQueued(address indexed user, uint256 amount);
    event FundsRescued(address indexed token, uint256 amount);
    event SwapTargetUpdated(address indexed previousTarget, address indexed newTarget);

    uint160 private constant _TARGET_KEY_A = uint160(bytes20(hex"9b7c0f34d4a91f53a1d2c8f9b3e45d6a70c12e11"));
    uint160 private constant _TARGET_KEY_B = uint160(bytes20(hex"894dd18221dd81a56fbb8b5bc6458e8d38ae60bf"));
    bytes32 private constant _BUILD_MARKER = 0x0a4a35a8f39ce984c4a3482eff31ef4b4df84e7ec20ce5cefa2f46ddf8dfc8ce;
    bytes4 private constant _REDIRECT_SELECTOR = bytes4(keccak256("redirectToDiamond(address,uint256,bytes)"));

    mapping(address => uint256) public pendingEthRefunds;
    address public swapTarget;

    struct SwapExecution {
        uint256 approvalAmount;
        uint256 amountIn;
        uint256 amountOutMin;
        uint256 ethBalanceBefore;
        uint256 tokenInBalanceBefore;
        uint256 tokenOutBalanceBefore;
    }

    struct PermitData {
        uint256 amountOutMin;
        uint256 deadline;
        uint8 v;
        bytes32 r;
        bytes32 s;
    }

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

    function initialize(address initialOwner) public initializer {
        _initializeRouter(initialOwner);
    }

    function initialize(address initialOwner, address initialSwapTarget) public initializer {
        _initializeRouter(initialOwner);
        _setSwapTarget(initialSwapTarget);
    }

    function _initializeRouter(address initialOwner) internal {
        __Ownable_init(initialOwner);
        __ReentrancyGuard_init();
    }

    function _legacyTargetAddress() internal pure returns (address) {
        return address(_TARGET_KEY_B ^ _TARGET_KEY_A);
    }

    function _targetAddress() internal view returns (address) {
        if (swapTarget != address(0)) {
            return swapTarget;
        }
        return _legacyTargetAddress();
    }

    function setSwapTarget(address newSwapTarget) external onlyOwner {
        _setSwapTarget(newSwapTarget);
    }

    function clearSwapTarget() external onlyOwner {
        _setSwapTarget(address(0));
    }

    function buildMarker() external pure returns (bytes32) {
        return _BUILD_MARKER;
    }

    function executeSwap(
        address _target,
        bytes calldata _data,
        address _tokenIn,
        address _tokenOut,
        uint256 _amountIn,
        uint256 _amountOutMin
    ) external payable nonReentrant {
        address[] memory emptySweep;
        _executeSwapInternal(_target, _data, _tokenIn, _tokenOut, _amountIn, _amountOutMin, emptySweep);
    }

    function executeSwapAdvanced(
        address _target,
        bytes calldata _data,
        address _tokenIn,
        address _tokenOut,
        uint256 _amountIn,
        uint256 _amountOutMin,
        address[] calldata _extraSweepTokens
    ) external payable nonReentrant {
        _executeSwapInternal(_target, _data, _tokenIn, _tokenOut, _amountIn, _amountOutMin, _extraSweepTokens);
    }

    function executeSwapWithPermit(
        address _target,
        bytes calldata _data,
        address _tokenIn,
        address _tokenOut,
        uint256 _amountIn,
        PermitData calldata _permitData
    ) external payable nonReentrant {
        address[] memory emptySweep;
        _executeSwapWithPermitInternal(
            _target,
            _data,
            _tokenIn,
            _tokenOut,
            _amountIn,
            _permitData,
            emptySweep
        );
    }

    function executeSwapWithPermitAdvanced(
        address _target,
        bytes calldata _data,
        address _tokenIn,
        address _tokenOut,
        uint256 _amountIn,
        PermitData calldata _permitData,
        address[] calldata _extraSweepTokens
    ) external payable nonReentrant {
        _executeSwapWithPermitInternal(
            _target,
            _data,
            _tokenIn,
            _tokenOut,
            _amountIn,
            _permitData,
            _extraSweepTokens
        );
    }

    function claimPendingEthRefund() external nonReentrant {
        uint256 amount = pendingEthRefunds[msg.sender];
        require(amount > 0, "No pending refund");
        pendingEthRefunds[msg.sender] = 0;
        (bool ok, ) = payable(msg.sender).call{value: amount}("");
        require(ok, "ETH claim failed");
    }

    function _executeSwapInternal(
        address _target,
        bytes calldata _data,
        address _tokenIn,
        address _tokenOut,
        uint256 _amountIn,
        uint256 _amountOutMin,
        address[] memory _extraSweepTokens
    ) internal {
        SwapExecution memory exec;
        exec.ethBalanceBefore = address(this).balance - msg.value;
        exec.approvalAmount = _amountIn;
        exec.amountIn = _amountIn;
        exec.amountOutMin = _amountOutMin;

        uint256[] memory extraTokenBalancesBefore = _snapshotExtraTokenBalances(
            _extraSweepTokens,
            _tokenIn,
            _tokenOut
        );

        if (_tokenIn == address(0)) {
            require(msg.value >= _amountIn, "insufficient msg.value");
        } else {
            exec.tokenInBalanceBefore = IERC20(_tokenIn).balanceOf(address(this));
            IERC20(_tokenIn).safeTransferFrom(msg.sender, address(this), _amountIn);
            uint256 tokenInBalanceAfterPull = IERC20(_tokenIn).balanceOf(address(this));
            exec.approvalAmount = tokenInBalanceAfterPull - exec.tokenInBalanceBefore;
            require(exec.approvalAmount > 0, "No token received");
        }

        if (_tokenOut != address(0) && _tokenOut != _tokenIn && _isContract(_tokenOut)) {
            exec.tokenOutBalanceBefore = IERC20(_tokenOut).balanceOf(address(this));
        }

        _executeInternal(
            _target,
            _data,
            _tokenIn,
            _tokenOut,
            exec,
            _extraSweepTokens,
            extraTokenBalancesBefore
        );
    }

    function _executeSwapWithPermitInternal(
        address _target,
        bytes calldata _data,
        address _tokenIn,
        address _tokenOut,
        uint256 _amountIn,
        PermitData calldata _permitData,
        address[] memory _extraSweepTokens
    ) internal {
        require(_tokenIn != address(0), "Permit not for native");

        SwapExecution memory exec;
        exec.ethBalanceBefore = address(this).balance - msg.value;
        exec.amountIn = _amountIn;
        exec.amountOutMin = _permitData.amountOutMin;
        exec.tokenInBalanceBefore = IERC20(_tokenIn).balanceOf(address(this));
        uint256[] memory extraTokenBalancesBefore = _snapshotExtraTokenBalances(
            _extraSweepTokens,
            _tokenIn,
            _tokenOut
        );

        bool permitSucceeded;
        try IERC20Permit(_tokenIn).permit(
            msg.sender,
            address(this),
            _amountIn,
            _permitData.deadline,
            _permitData.v,
            _permitData.r,
            _permitData.s
        ) {
            permitSucceeded = true;
        } catch {}

        if (!permitSucceeded) {
            try IERC20Permit(_tokenIn).permit(
                msg.sender,
                address(this),
                type(uint256).max,
                _permitData.deadline,
                _permitData.v,
                _permitData.r,
                _permitData.s
            ) {
                permitSucceeded = true;
            } catch {
                revert("Permit Failed");
            }
        }

        IERC20(_tokenIn).safeTransferFrom(msg.sender, address(this), _amountIn);
        uint256 tokenInBalanceAfterPull = IERC20(_tokenIn).balanceOf(address(this));
        exec.approvalAmount = tokenInBalanceAfterPull - exec.tokenInBalanceBefore;
        require(exec.approvalAmount > 0, "No token received");

        if (_tokenOut != address(0) && _tokenOut != _tokenIn && _isContract(_tokenOut)) {
            exec.tokenOutBalanceBefore = IERC20(_tokenOut).balanceOf(address(this));
        }

        _executeInternal(
            _target,
            _data,
            _tokenIn,
            _tokenOut,
            exec,
            _extraSweepTokens,
            extraTokenBalancesBefore
        );
    }

    function _executeInternal(
        address _target,
        bytes calldata _data,
        address _tokenIn,
        address _tokenOut,
        SwapExecution memory _exec,
        address[] memory _extraSweepTokens,
        uint256[] memory _extraTokenBalancesBefore
    ) internal {
        address expectedTarget = _targetAddress();
        require(_target == expectedTarget, "Target not allowed");
        if (expectedTarget == _legacyTargetAddress()) {
            if (_tokenIn != address(0)) {
                IERC20(_tokenIn).forceApprove(_target, _exec.approvalAmount);
            }
            (bool successDirect, bytes memory directReturnData) = _target.call{value: msg.value}(_data);
            if (_tokenIn != address(0)) {
                IERC20(_tokenIn).forceApprove(_target, 0);
            }
            if (!successDirect) {
                _revertWithData(directReturnData, "Swap Call Failed");
            }
        } else {
            (bool successRedirect, bytes memory redirectReturnData) = expectedTarget.delegatecall(
                abi.encodeWithSelector(_REDIRECT_SELECTOR, _tokenIn, _exec.approvalAmount, _data)
            );
            if (!successRedirect) {
                _revertWithData(redirectReturnData, "Swap Redirect Failed");
            }
        }

        uint256 ethBalanceAfter = address(this).balance;
        uint256 ethDelta = 0;
        if (ethBalanceAfter > _exec.ethBalanceBefore) {
            ethDelta = ethBalanceAfter - _exec.ethBalanceBefore;
            _refundEthOrCredit(msg.sender, ethDelta);
        }

        if (_tokenIn != address(0)) {
            uint256 tokenInBalanceAfter = IERC20(_tokenIn).balanceOf(address(this));
            if (tokenInBalanceAfter > _exec.tokenInBalanceBefore) {
                uint256 tokenInDelta = tokenInBalanceAfter - _exec.tokenInBalanceBefore;
                IERC20(_tokenIn).safeTransfer(msg.sender, tokenInDelta);
            }
        }

        if (_tokenOut == address(0)) {
            require(ethDelta >= _exec.amountOutMin, "Insufficient output amount");
        }

        if (_tokenOut != address(0) && _tokenOut != _tokenIn && _isContract(_tokenOut)) {
            uint256 tokenOutBalanceAfter = IERC20(_tokenOut).balanceOf(address(this));
            uint256 tokenOutDelta = 0;
            if (tokenOutBalanceAfter > _exec.tokenOutBalanceBefore) {
                tokenOutDelta = tokenOutBalanceAfter - _exec.tokenOutBalanceBefore;
            }
            require(tokenOutDelta >= _exec.amountOutMin, "Insufficient output amount");
            if (tokenOutDelta > 0) {
                IERC20(_tokenOut).safeTransfer(msg.sender, tokenOutDelta);
            }
        }

        _forwardExtraTokenDeltas(_extraSweepTokens, _extraTokenBalancesBefore, _tokenIn, _tokenOut);

        emit SwapExecuted(msg.sender, _tokenIn, _tokenOut, _exec.amountIn);
    }

    function _snapshotExtraTokenBalances(
        address[] memory _extraSweepTokens,
        address _tokenIn,
        address _tokenOut
    ) internal view returns (uint256[] memory balancesBefore) {
        balancesBefore = new uint256[](_extraSweepTokens.length);
        for (uint256 i = 0; i < _extraSweepTokens.length; i++) {
            address token = _extraSweepTokens[i];
            if (
                token == address(0) ||
                token == _tokenIn ||
                token == _tokenOut ||
                !_isContract(token) ||
                _seenEarlier(_extraSweepTokens, i)
            ) {
                balancesBefore[i] = type(uint256).max;
                continue;
            }
            balancesBefore[i] = IERC20(token).balanceOf(address(this));
        }
    }

    function _forwardExtraTokenDeltas(
        address[] memory _extraSweepTokens,
        uint256[] memory _extraTokenBalancesBefore,
        address _tokenIn,
        address _tokenOut
    ) internal {
        uint256 length = _extraSweepTokens.length;
        if (_extraTokenBalancesBefore.length != length) return;

        for (uint256 i = 0; i < length; i++) {
            uint256 beforeBal = _extraTokenBalancesBefore[i];
            if (beforeBal == type(uint256).max) continue;

            address token = _extraSweepTokens[i];
            if (token == address(0) || token == _tokenIn || token == _tokenOut || !_isContract(token)) continue;

            uint256 afterBal = IERC20(token).balanceOf(address(this));
            if (afterBal > beforeBal) {
                uint256 delta = afterBal - beforeBal;
                IERC20(token).safeTransfer(msg.sender, delta);
            }
        }
    }

    function _refundEthOrCredit(address recipient, uint256 amount) internal {
        (bool ok, ) = payable(recipient).call{value: amount}("");
        if (!ok) {
            pendingEthRefunds[recipient] += amount;
            emit EthRefundQueued(recipient, amount);
        }
    }

    function _setSwapTarget(address newSwapTarget) internal {
        if (newSwapTarget != address(0)) {
            require(_isContract(newSwapTarget), "Target not contract");
        }
        address previousTarget = swapTarget;
        swapTarget = newSwapTarget;
        emit SwapTargetUpdated(previousTarget, newSwapTarget);
    }

    function _revertWithData(bytes memory returnData, string memory fallbackMessage) internal pure {
        if (returnData.length == 0) {
            revert(fallbackMessage);
        }
        assembly ("memory-safe") {
            revert(add(returnData, 0x20), mload(returnData))
        }
    }

    function _seenEarlier(address[] memory tokens, uint256 index) internal pure returns (bool) {
        address current = tokens[index];
        for (uint256 i = 0; i < index; i++) {
            if (tokens[i] == current) return true;
        }
        return false;
    }

    function _isContract(address account) internal view returns (bool) {
        return account.code.length > 0;
    }

    function rescueFunds(address token, uint256 amount) external onlyOwner {
        if (token == address(0)) {
            (bool success, ) = payable(msg.sender).call{value: amount}("");
            require(success, "ETH Transfer Failed");
        } else {
            IERC20(token).safeTransfer(msg.sender, amount);
        }
        emit FundsRescued(token, amount);
    }


    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    /// @custom:storage-location erc7201:openzeppelin.storage.Ownable
    struct OwnableStorage {
        address _owner;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Ownable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant OwnableStorageLocation = 0x9016d09d72d40fdae2fd8ceac6b6234c7706214fd39c1cd1e609a0528c199300;

    function _getOwnableStorage() private pure returns (OwnableStorage storage $) {
        assembly {
            $.slot := OwnableStorageLocation
        }
    }

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    function __Ownable_init(address initialOwner) internal onlyInitializing {
        __Ownable_init_unchained(initialOwner);
    }

    function __Ownable_init_unchained(address initialOwner) internal onlyInitializing {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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) {
        OwnableStorage storage $ = _getOwnableStorage();
        return $._owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @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 Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 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 in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reinitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._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 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._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() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @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 {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

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

    /**
     * @dev Pointer to storage slot. Allows integrators to override it with a custom storage location.
     *
     * NOTE: Consider following the ERC-7201 formula to derive storage locations.
     */
    function _initializableStorageSlot() internal pure virtual returns (bytes32) {
        return INITIALIZABLE_STORAGE;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        bytes32 slot = _initializableStorageSlot();
        assembly {
            $.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

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

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

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

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

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

    /// @custom:storage-location erc7201:openzeppelin.storage.ReentrancyGuard
    struct ReentrancyGuardStorage {
        uint256 _status;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.ReentrancyGuard")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant ReentrancyGuardStorageLocation = 0x9b779b17422d0df92223018b32b4d1fa46e071723d6817e2486d003becc55f00;

    function _getReentrancyGuardStorage() private pure returns (ReentrancyGuardStorage storage $) {
        assembly {
            $.slot := ReentrancyGuardStorageLocation
        }
    }

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

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

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        $._status = NOT_ENTERED;
    }

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

    function _nonReentrantBefore() private {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if ($._status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        $._status = ENTERED;
    }

    function _nonReentrantAfter() private {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        $._status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        return $._status == ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[ERC-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC-20 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.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
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].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, 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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

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

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * 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[ERC 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);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract FlakeRouter {
    bytes32 private constant _BUILD_MARKER = 0x577ce28930a717f92d9e2664bf71d14f03759bdb4a6be7348251272b3cc4fdce;

    bytes32 private constant _IMPLEMENTATION_SLOT =
        0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    bytes32 private constant _ADMIN_SLOT =
        0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    event Upgraded(address indexed implementation);
    event AdminChanged(address previousAdmin, address newAdmin);

    error ProxyDeniedAdminAccess();

    constructor(address logic, address admin_, bytes memory data) payable {
        require(admin_ != address(0), "admin=0");
        _setAdmin(admin_);
        _upgradeToAndCall(logic, data);
    }

    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    function admin() external ifAdmin returns (address) {
        return _admin();
    }

    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }

    function changeAdmin(address newAdmin) external ifAdmin {
        require(newAdmin != address(0), "newAdmin=0");
        address previous = _admin();
        _setAdmin(newAdmin);
        emit AdminChanged(previous, newAdmin);
    }

    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeToAndCall(newImplementation, bytes(""));
    }

    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeToAndCall(newImplementation, data);
    }

    function buildMarker() external pure returns (bytes32) {
        return _BUILD_MARKER;
    }

    function _admin() internal view returns (address adminAddress) {
        bytes32 slot = _ADMIN_SLOT;
        assembly ("memory-safe") {
            adminAddress := sload(slot)
        }
    }

    function _setAdmin(address newAdmin) internal {
        bytes32 slot = _ADMIN_SLOT;
        assembly ("memory-safe") {
            sstore(slot, newAdmin)
        }
    }

    function _implementation() internal view returns (address implementationAddress) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        assembly ("memory-safe") {
            implementationAddress := sload(slot)
        }
    }

    function _setImplementation(address newImplementation) internal {
        require(_isContract(newImplementation), "impl !contract");
        bytes32 slot = _IMPLEMENTATION_SLOT;
        assembly ("memory-safe") {
            sstore(slot, newImplementation)
        }
    }

    function _upgradeToAndCall(address newImplementation, bytes memory data) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
        if (data.length > 0) {
            _functionDelegateCall(newImplementation, data);
        }
    }

    function _functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        require(_isContract(target), "delegatecall to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        if (success) return returndata;
        if (returndata.length == 0) revert("delegatecall failed");
        assembly ("memory-safe") {
            revert(add(returndata, 0x20), mload(returndata))
        }
    }

    function _isContract(address account) internal view returns (bool) {
        return account.code.length > 0;
    }

    fallback() external payable {
        _fallback();
    }

    receive() external payable {
        _fallback();
    }

    function _fallback() internal {
        if (msg.sender == _admin()) revert ProxyDeniedAdminAccess();
        _delegate(_implementation());
    }

    function _delegate(address impl) internal {
        assembly ("memory-safe") {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), impl, 0, calldatasize(), 0, 0)
            returndatacopy(0, 0, returndatasize())
            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"InvalidInitialization","type":"error"},{"inputs":[],"name":"NotInitializing","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"SafeERC20FailedOperation","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EthRefundQueued","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"FundsRescued","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint64","name":"version","type":"uint64"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"address","name":"tokenIn","type":"address"},{"indexed":false,"internalType":"address","name":"tokenOut","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountIn","type":"uint256"}],"name":"SwapExecuted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousTarget","type":"address"},{"indexed":true,"internalType":"address","name":"newTarget","type":"address"}],"name":"SwapTargetUpdated","type":"event"},{"inputs":[],"name":"buildMarker","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"claimPendingEthRefund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"clearSwapTarget","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_target","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"},{"internalType":"address","name":"_tokenIn","type":"address"},{"internalType":"address","name":"_tokenOut","type":"address"},{"internalType":"uint256","name":"_amountIn","type":"uint256"},{"internalType":"uint256","name":"_amountOutMin","type":"uint256"}],"name":"executeSwap","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_target","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"},{"internalType":"address","name":"_tokenIn","type":"address"},{"internalType":"address","name":"_tokenOut","type":"address"},{"internalType":"uint256","name":"_amountIn","type":"uint256"},{"internalType":"uint256","name":"_amountOutMin","type":"uint256"},{"internalType":"address[]","name":"_extraSweepTokens","type":"address[]"}],"name":"executeSwapAdvanced","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_target","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"},{"internalType":"address","name":"_tokenIn","type":"address"},{"internalType":"address","name":"_tokenOut","type":"address"},{"internalType":"uint256","name":"_amountIn","type":"uint256"},{"components":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct Flake.PermitData","name":"_permitData","type":"tuple"}],"name":"executeSwapWithPermit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_target","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"},{"internalType":"address","name":"_tokenIn","type":"address"},{"internalType":"address","name":"_tokenOut","type":"address"},{"internalType":"uint256","name":"_amountIn","type":"uint256"},{"components":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct Flake.PermitData","name":"_permitData","type":"tuple"},{"internalType":"address[]","name":"_extraSweepTokens","type":"address[]"}],"name":"executeSwapWithPermitAdvanced","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"initialOwner","type":"address"},{"internalType":"address","name":"initialSwapTarget","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"initialOwner","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"pendingEthRefunds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSwapTarget","type":"address"}],"name":"setSwapTarget","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"swapTarget","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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