// File: src/SushiXSwapV2.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.10;

import "./interfaces/ISushiXSwapV2.sol";

/// @title SushiXSwapV2
/// @notice Cross-chain swaps & general message passing through adapters
contract SushiXSwapV2 is ISushiXSwapV2, Ownable, Multicall {
    using SafeERC20 for IERC20;

    IRouteProcessor public rp;

    mapping(address => bool) public approvedAdapters;
    mapping(address => bool) privilegedUsers;

    address constant NATIVE_ADDRESS =
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    IWETH public immutable weth;

    uint8 private unlocked = 1;
    uint8 private paused = 1;

    constructor(IRouteProcessor _rp, address _weth) {
        rp = _rp;
        weth = IWETH(_weth);
    }

    modifier onlyApprovedAdapters(address _adapter) {
        require(approvedAdapters[_adapter], "Not Approved Adatper");
        _;
    }

    modifier onlyOwnerOrPrivilegedUser() {
        require(
            msg.sender == owner() || privilegedUsers[msg.sender] == true,
            "SushiXSwapV2 not owner or privy user"
        );
        _;
    }

    modifier lock() {
        require(unlocked == 1, "SushiXSwapV2 is locked");
        require(paused == 1, "SushiXSwapV2 is paused");
        unlocked = 2;
        _;
        unlocked = 1;
    }

    /// @notice Set an adddress as privileged user
    /// @param user The address to set
    /// @param privileged The status of users's privileged status
    function setPrivileged(address user, bool privileged) external onlyOwner {
        privilegedUsers[user] = privileged;
    }

    /// @notice pause the contract
    function pause() external onlyOwnerOrPrivilegedUser {
        paused = 2;
    }

    /// @notice resume the contract from paused state
    function resume() external onlyOwnerOrPrivilegedUser {
        paused = 1;
    }

    /// @inheritdoc ISushiXSwapV2
    function updateAdapterStatus(
        address _adapter,
        bool _status
    ) external onlyOwner {
        approvedAdapters[_adapter] = _status;
    }

    /// @inheritdoc ISushiXSwapV2
    function updateRouteProcessor(
        address newRouteProcessor
    ) external onlyOwner {
        rp = IRouteProcessor(newRouteProcessor);
    }

    /// @inheritdoc ISushiXSwapV2
    function swap(bytes memory _swapData) external payable override lock {
        // just swap
        _swap(_swapData);
    }

    function _swap(bytes memory _swapData) internal {
        // internal just swap

        IRouteProcessor.RouteProcessorData memory rpd = abi.decode(
            _swapData,
            (IRouteProcessor.RouteProcessorData)
        );

        if (rpd.tokenIn != NATIVE_ADDRESS) {
            IERC20(rpd.tokenIn).safeTransferFrom(
                msg.sender,
                address(this),
                rpd.amountIn
            );
            // increase token approval to RP
            IERC20(rpd.tokenIn).safeIncreaseAllowance(address(rp), rpd.amountIn);
        }

        rp.processRoute(
            rpd.tokenIn,
            rpd.amountIn,
            rpd.tokenOut,
            rpd.amountOutMin,
            rpd.to,
            rpd.route
        );
    }

    /// @inheritdoc ISushiXSwapV2
    function sendMessage(
        address _adapter,
        bytes calldata _adapterData
    ) external payable override lock onlyApprovedAdapters(_adapter) {
        // send cross chain message
        ISushiXSwapV2Adapter(_adapter).sendMessage(_adapterData);
    }

    /// @inheritdoc ISushiXSwapV2
    function bridge(
        BridgeParams calldata _bridgeParams,
        bytes calldata _swapPayload,
        bytes calldata _payloadData
    )
        external
        payable
        override
        lock
        onlyApprovedAdapters(_bridgeParams.adapter)
    {
        // bridge

        if (_bridgeParams.tokenIn != NATIVE_ADDRESS) {
            IERC20(_bridgeParams.tokenIn).safeTransferFrom(
                msg.sender,
                _bridgeParams.adapter,
                _bridgeParams.amountIn
            );
        }

        ISushiXSwapV2Adapter(_bridgeParams.adapter).adapterBridge{
            value: address(this).balance
        }(_bridgeParams.adapterData, _swapPayload, _payloadData);

        emit SushiXSwapOnSrc(
            _bridgeParams.refId,
            msg.sender,
            _bridgeParams.adapter,
            _bridgeParams.tokenIn,
            _bridgeParams.amountIn,
            _bridgeParams.to
        );
    }
    
    /// @inheritdoc ISushiXSwapV2
    function swapAndBridge(
        BridgeParams calldata _bridgeParams,
        bytes calldata _swapData,
        bytes calldata _swapPayload,
        bytes calldata _payloadData
    )
        external
        payable
        override
        lock
        onlyApprovedAdapters(_bridgeParams.adapter)
    {
        // swap and bridge

        _swap(_swapData);

        ISushiXSwapV2Adapter(_bridgeParams.adapter).adapterBridge{
            value: address(this).balance
        }(_bridgeParams.adapterData, _swapPayload, _payloadData);

        emit SushiXSwapOnSrc(
            _bridgeParams.refId,
            msg.sender,
            _bridgeParams.adapter,
            _bridgeParams.tokenIn,
            _bridgeParams.amountIn,
            _bridgeParams.to
        );
    }

    /// @notice Rescue tokens from the contract
    /// @param _token The address of the token to rescue
    /// @param _to The address to send the tokens to
    function rescueTokens(address _token, address _to) external onlyOwner {
        if (_token != NATIVE_ADDRESS) {
            IERC20(_token).safeTransfer(
                _to,
                IERC20(_token).balanceOf(address(this))
            );
        } else {
            payable(_to).transfer(address(this).balance);
        }
    }
}

// File: src/interfaces/ISushiXSwapV2.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.10;

import "./IRouteProcessor.sol";
import "./ISushiXSwapV2Adapter.sol";
import "./IWETH.sol";
import "openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import "openzeppelin-contracts/contracts/utils/Multicall.sol";
import "openzeppelin-contracts/contracts/access/Ownable.sol";

interface ISushiXSwapV2 {
    struct BridgeParams {
        bytes2 refId;
        address adapter;
        address tokenIn;
        uint256 amountIn;
        address to;
        bytes adapterData;
    }

    /// @notice Emitted when a bridge or swapAndBridge is executed
    /// @param refId The reference id for integrators to pass when using xswap
    /// @param sender The address of the sender
    /// @param adapter The address of the adapter to bridge through
    /// @param tokenIn The address of the token to bridge or pre-bridge swap from
    /// @param amountIn The amount of token to bridge or pre-bridge swap from
    /// @param to The address to send the bridged or post-bridge swapped token to 
    event SushiXSwapOnSrc(
        bytes2 indexed refId,
        address indexed sender,
        address adapter,
        address tokenIn,
        uint256 amountIn,
        address to
    );

    /// @notice Update Adapter status to enable or disable for use
    /// @param _adapter The address of the adapter to update
    /// @param _status The status to set the adapter to
    function updateAdapterStatus(address _adapter, bool _status) external;
    
    /// @notice Update the RouteProcessor contract that is used
    /// @param newRouteProcessor The address of the new RouteProcessor contract
    function updateRouteProcessor(address newRouteProcessor) external;

    /// @notice Execute a swap using _swapData with RouteProcessor
    /// @param _swapData The data to pass to RouteProcessor
    function swap(bytes memory _swapData) external payable;

    /// @notice Perform a bridge through passed adapter in _bridgeParams
    /// @param _bridgeParams The bridge data for the function call
    /// @param _swapPayload The swap data payload to pass to adapter
    /// @param _payloadData The payload data to pass to adapter
    function bridge(
        BridgeParams calldata _bridgeParams,
        bytes calldata _swapPayload,
        bytes calldata _payloadData
    ) external payable;
    
    /// @notice Perform a swap then bridge through passed adapter in _bridgeParams
    /// @param _bridgeParams The bridge data for the function call
    /// @param _swapData The swap data to pass to RouteProcessor
    /// @param _swapPayload The swap data payload to pass to adapter
    /// @param _payloadData The payload data to pass to adapter
    function swapAndBridge(
        BridgeParams calldata _bridgeParams,
        bytes calldata _swapData,
        bytes calldata _swapPayload,
        bytes calldata _payloadData
    ) external payable;
    
    /// @notice Send a message through passed _adapter address
    /// @param _adapter The address of the adapter to send the message through
    /// @param _adapterData The data to pass to the adapter
    function sendMessage(
        address _adapter,
        bytes calldata _adapterData
    ) external payable;
}

// File: src/interfaces/IRouteProcessor.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.10;

interface IRouteProcessor {
    
    struct RouteProcessorData {
        address tokenIn;
        uint256 amountIn;
        address tokenOut;
        uint256 amountOutMin;
        address to;
        bytes route;
    }
    
    /// @notice Process a swap with passed route on RouteProcessor
    /// @param tokenIn The address of the token to swap from
    /// @param amountIn The amount of token to swap from
    /// @param tokenOut The address of the token to swap to
    /// @param amountOutMin The minimum amount of token to receive
    /// @param to The address to send the swapped token to
    /// @param route The route to use for the swap
    function processRoute(
        address tokenIn,
        uint256 amountIn,
        address tokenOut,
        uint256 amountOutMin,
        address to,
        bytes memory route
    ) external payable returns (uint256 amountOut);
}

// File: src/interfaces/ISushiXSwapV2Adapter.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.10;

import "./IPayloadExecutor.sol";

interface ISushiXSwapV2Adapter {
    
    /// @dev Most adapters will implement their own struct for the adapter, but this can be used for generic adapters
    struct BridgeParamsAdapter {
        address tokenIn;
        uint256 amountIn;
        address to;
        bytes adapterData;
    }

    struct PayloadData {
        address target;
        uint256 gasLimit;
        bytes targetData;
    }
    
    /// @notice Perform a swap after post bridging
    /// @param _amountBridged The amount of tokens bridged
    /// @param _swapData The swap data to pass to RouteProcessor
    /// @param _token The address of the token to swap
    /// @param _payloadData The payload data to pass to payload executor
    function swap(
        uint256 _amountBridged,
        bytes calldata _swapData,
        address _token,
        bytes calldata _payloadData
    ) external payable;

    /// @notice Execute a payload after bridging - w/o pre-swapping
    /// @param _amountBridged The amount of tokens bridged
    /// @param _payloadData The payload data to pass to payload executor
    /// @param _token The address of the token to swap
    function executePayload(
        uint256 _amountBridged,
        bytes calldata _payloadData,
        address _token
    ) external payable;

    /// @notice Where the actual bridging is executed from on adapter
    /// @param _adapterData The adapter data to pass to adapter
    /// @param _swapDataPayload The swap data payload to pass through bridge
    /// @param _payloadData The payload data to pass to pass through bridge
    function adapterBridge(
        bytes calldata _adapterData,
        bytes calldata _swapDataPayload,
        bytes calldata _payloadData
    ) external payable;
    
    /// @notice Where the actual messaging is executed from on adapter
    /// @param _adapterData The adapter data to pass to adapter
    function sendMessage(bytes calldata _adapterData) external;
}

// File: src/interfaces/IWETH.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.10;

interface IWETH {
    function deposit() external payable;

    function transfer(address to, uint256 value) external returns (bool);

    function withdraw(uint256) external;

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

// File: lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

    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));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

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

// File: lib/openzeppelin-contracts/contracts/utils/Multicall.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Multicall.sol)

pragma solidity ^0.8.0;

import "./Address.sol";

/**
 * @dev Provides a function to batch together multiple calls in a single external call.
 *
 * _Available since v4.1._
 */
abstract contract Multicall {
    /**
     * @dev Receives and executes a batch of function calls on this contract.
     */
    function multicall(bytes[] calldata data) external virtual returns (bytes[] memory results) {
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; i++) {
            results[i] = Address.functionDelegateCall(address(this), data[i]);
        }
        return results;
    }
}

// File: lib/openzeppelin-contracts/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// File: src/interfaces/IPayloadExecutor.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.10;

interface IPayloadExecutor {
    /// @notice Execute a payload
    /// @param _data The data to pass to payload executor
    function onPayloadReceive(bytes memory _data) external;
}

// File: lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// File: lib/openzeppelin-contracts/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



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

pragma solidity ^0.8.0;

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

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

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

// File: lib/openzeppelin-contracts/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://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 functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

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

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

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

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

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

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

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

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

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

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

// File: lib/openzeppelin-contracts/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;
    }
}