// File: /contracts/Marketplace/WosPackages.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "./Tax.sol";
import "../ERC20/interfaces/IOperable.sol";

contract WosPackages is ReentrancyGuard, Ownable, Tax {
    using SafeERC20 for IERC20;
    using Counters for Counters.Counter;

    Counters.Counter private _itemIds;
    Counters.Counter private _total;
    IERC20 private wosContract;

    struct WosPackage {
        uint256 itemId;
        uint256 price;
        uint256 wosAmount;
        uint256 amount;
    }

    event NewWosPackage(
        uint256 indexed itemId,
        uint256 price,
        uint256 wosAmount,
        uint256 amount
    );

    event WosPackageSold(
        uint256 indexed itemId,
        address indexed buyer,
        uint256 amount,
        uint256 totalWos,
        uint256 totalPrice,
        uint256 wosAmount,
        uint256 unitPrice
    );

    mapping(uint256 => WosPackage) private wosPackageId;

    constructor(
        IERC20 _wos_contract_address,
        address _collateral,
        address _aggAddress,
        address _signatureCollateral
    ) Tax(address(0), _collateral, _aggAddress, _signatureCollateral) {
        require(
            address(_wos_contract_address) != address(0),
            "_wos_contract_address address can not be zero"
        );

        wosContract = _wos_contract_address;
    }

    function createWosPackage(
        uint256 price,
        uint256 wosAmount,
        uint256 amount
    ) external onlyOwner {
        require(price > 0, "price must be greater than 0");
        require(wosAmount > 0, "wosAmount must be greater than 0");
        require(amount > 0, "amount must be greater than 0");

        _total.increment();
        _itemIds.increment();

        uint256 itemId = _itemIds.current();

        wosPackageId[itemId] = WosPackage(itemId, price, wosAmount, amount);

        IOperable(address(wosContract)).mint(wosAmount * amount);

        emit NewWosPackage(itemId, price, wosAmount, amount);
    }

    function buyWosPackage(uint256 itemId, uint256 amount)
        external
        checkPackage(itemId)
        nonReentrant
    {
        require(itemId > 0, "itemId cannot be 0");
        require(amount > 0, "amount must be greater than 0");
        require(
            wosPackageId[itemId].amount >= amount,
            "There are not enough such packages."
        );

        uint256 price = wosPackageId[itemId].price;
        uint256 wosAmount = wosPackageId[itemId].wosAmount;
        uint256 totalWos = wosAmount * amount;
        uint256 totalPrice = price * amount;

        wosPackageId[itemId].amount -= amount;

        _ctSign("BWP_TF_STEP_1");
        _collateralTransferFrom(msg.sender, address(this), totalPrice);

        _ctSign("BWP_T_STEP_2");
        _taxDistributionPreSales(totalPrice);

        wosContract.safeTransfer(msg.sender, totalWos);

        emit WosPackageSold(
            itemId,
            msg.sender,
            amount,
            totalWos,
            totalPrice,
            wosAmount,
            price
        );
    }

    function addPackages(uint256 itemId, uint256 amount) external checkPackage(itemId) onlyOwner {
        require(amount > 0, "amount must be greater than 0");
        wosPackageId[itemId].amount += amount;
    }

    function getPackageData(uint256 itemId)
        external
        view
        returns (WosPackage memory)
    {
        return wosPackageId[itemId];
    }

    function totalWosPackages() external view returns (uint256) {
        uint256 total = _itemIds.current();
        return total;
    }

    modifier checkPackage(uint256 itemId) {
        require(itemId > 0, "itemId cannot be 0");
        require(wosPackageId[itemId].itemId == itemId, "Wrong or missing package");
        _;
    }
}

// File: /contracts/util/CriticalTracer.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

import "@openzeppelin/contracts/access/Ownable.sol";

contract CriticalTracer is Ownable {
    string private trace;
    bool private enabled = false;

    function _ctMsg(string memory message) internal view returns (string memory) {
        if (!enabled) return message;
        return string.concat(message, "; ", trace);
    }

    function _ctSign(string memory sign) internal {
        trace = sign;
    }

    function setTracerStatus(bool enable) onlyOwner public {
        enabled = enable;
    }

    function getTracerStatus() public view returns (bool) {
        return enabled;
    }
}

// File: /contracts/Security/interfaces/IECDSASignatureCollateral.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

interface IECDSASignatureCollateral {
    function hashingExtractMessage(address to, uint256 amount) external pure returns (bytes32);
    function hashingSetCollateralMessage(address tokenAddress) external pure returns (bytes32);
    function verifyMessage(bytes32 messageHash, uint256 nonce, uint256 timestamp, bytes[] memory signatures) external;
}
// File: /contracts/Marketplace/Tax.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./CollateralWrapper.sol";
import "./../ISimpleStaking.sol";

contract Tax is CollateralWrapper {
    uint256 constant tax = 5;
    address private WosStakingAddress;
    address private DG;
    address private JS;
    address private OpWallet;
    address private Agregadores;
    address private SLWallet;

    //Wallets of presales
    address private PreSalesOP;
    address private PreSalesMk;

    constructor(
        address _wosStakingAddress,
        address _collateral,
        address _aggAddress,
        address _signatureCollateral
    ) CollateralWrapper(_collateral, _signatureCollateral) {
        WosStakingAddress = _wosStakingAddress; //Smart Contract
        Agregadores = _aggAddress; //Contract
        DG = 0x9Fe30a5c5424BC3E461AD13B4947465e6460113d; //wallet
        JS = 0x491f38D5ae8Dc0C1fB7Ad7AB3A122393F758937F; //wallet
        OpWallet = 0x8A1078E9C93D98E724b54841fbb60E7Ea28d1654; //wallet
        SLWallet = 0xC3353c719b7D987123b248d5Fe4b35cbC05e5fa7; //wallet
        PreSalesOP = 0x788B366fbb3C57dA08749c0253C175B51f04C6c5;
        PreSalesMk = 0x61B1a5728AE9e5Da194AF8dF12C6F614228cC605;
    }

    function _getPriceWithoutTax(uint256 price)
        internal
        pure
        returns (uint256)
    {
        return price - (tax * price) / 100;
    }

    function _taxDistributionPreSales(uint256 price) internal {
        uint256 amountDistribute = price / 2;

        _ctSign("TXPS_T_STEP_1");
        _collateralTransfer(PreSalesOP, amountDistribute);

        _ctSign("TXPS_T_STEP_2");
        _collateralTransfer(PreSalesMk, amountDistribute);
    }

    function _taxDistribution(uint256 price) internal {
        uint256 taxAmount = (tax * price) / 100;

        uint256 amountDistribute = taxAmount / 5;

        uint256 amountHalf = amountDistribute / 2;
        uint256 amountHalf2 = (amountDistribute / 4) * 3;

        _ctSign("TX_T_STEP_1");
        _collateralTransfer(WosStakingAddress, amountDistribute); //1%

        _ctSign("TX_T_STEP_2.1");
        _collateralTransfer(OpWallet, amountHalf2); //0.75%

        _ctSign("TX_T_STEP_2.2");
        _collateralTransfer(SLWallet, amountHalf2); //0.75%

        _ctSign("TX_T_STEP_3");
        _collateralTransfer(Agregadores, amountHalf); //0.5%

        _ctSign("TX_T_STEP_4");
        _collateralTransfer(DG, amountDistribute); //1%

        _ctSign("TX_T_STEP_5");
        _collateralTransfer(JS, amountDistribute); //1%
    }
}

// File: /contracts/Marketplace/CollateralWrapper.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";


import "../util/CriticalTracer.sol";
import "../ERC20/interfaces/IERC20Collateral.sol";
import "../Security/interfaces/IECDSASignatureCollateral.sol";

contract CollateralWrapper is CriticalTracer {
    using SafeERC20 for IERC20;
    IERC20 private collateral;
    IECDSASignatureCollateral private signatureCollateral;
    event CollateralAddressChanged(address newCollateralAddress);
    uint8 tokenDecimals;
    
    constructor(address _collateral, address _signatureCollateral) {
        collateral = IERC20(_collateral);
        tokenDecimals = IERC20Collateral(_collateral).decimals();
        signatureCollateral = IECDSASignatureCollateral(_signatureCollateral);
    }

    function getCollateralAddress() external view returns (address) {
        return address(collateral);
    }

    function setCollateralAddress(address tokenAddress, uint256 nonce, uint256 timestamp, bytes[] memory signatures) external onlyOwner {
        signatureCollateral.verifyMessage(
            signatureCollateral.hashingSetCollateralMessage(tokenAddress),
            nonce,
            timestamp,
            signatures
        );
        require(tokenAddress != address(0), _ctMsg("address cannot be zero"));
        collateral = IERC20Collateral(tokenAddress);
        emit CollateralAddressChanged(tokenAddress);
    }

    function _collateralTransfer(address to, uint256 amount) validateBalance(amount) internal {
        require(to != address(0), _ctMsg("address cannot be zero"));
        require(amount > 0, _ctMsg("amount cannot be zero"));
        require(amount <= _collateralBalanceOf(address(this)), _ctMsg("not enough collateral"));
        collateral.safeTransfer(to, amount);
    }

    function _collateralTransferFrom(address from, address to, uint256 amount) validateBalanceFrom(amount) internal {
        require(to != address(0), _ctMsg("address cannot be zero"));
        require(from != address(0), _ctMsg("the from address cannot be zero"));
        require(amount > 0, _ctMsg("amount cannot be zero"));

        collateral.safeTransferFrom(from, to, amount);
    }

    function _collateralBalanceOf(address account) internal view returns (uint256) {
        return collateral.balanceOf(account);
    }

    function extractCollateral(address to, uint256 amount, uint256 nonce, uint256 timestamp, bytes[] memory signatures) external {
        
        signatureCollateral.verifyMessage(
            signatureCollateral.hashingExtractMessage(to, amount),
            nonce,
            timestamp,
            signatures
        );

        _collateralTransfer(to, amount);
    }

    function decimals() public view returns (uint8) {
        return tokenDecimals;
    }

    function raise(uint256 amount) internal view returns (uint256) {
        return amount * 10 ** decimals();
    }
    
    modifier validateBalance(uint256 price) {
        require(collateral.balanceOf(address(this)) >= price, _ctMsg("there is not enough collateral to transfer"));
        _;
    }

    modifier validateBalanceFrom(uint256 price) {
        require(collateral.balanceOf(msg.sender) >= price, _ctMsg("you dont have enough collateral"));
        _;
    }
}
// File: /contracts/ISimpleStaking.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

interface ISimpleStaking{
    function distribute() external;
}
// File: /contracts/ERC20/interfaces/IOperable.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IOperable is IERC20{
    function mint(uint256 amount) external;
    function burn(uint amount) external;
    function raise(uint256 amount) external view returns (uint256);
}
// File: /contracts/ERC20/interfaces/IERC20Collateral.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IERC20Collateral is IERC20{
    function decimals() external view returns (uint8);
}
// File: @openzeppelin/contracts/utils/Counters.sol



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

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 functionCall(target, data, "Address: low-level call failed");
    }

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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: @openzeppelin/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: @openzeppelin/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: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// File: @openzeppelin/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);
    }
}