Contract Address Details

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

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

/**
 * @title IPulseXRouter
 * @dev Interface for PulseXRouter (Uniswap V2 style)
 */
interface IPulseXRouter {
    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
}

/**
 * @title IPlaygroundFeeVault
 * @dev Interface for PlaygroundFeeVault contract
 */
interface IPlaygroundFeeVault {
    function deposit(address playground) external payable;
}

/**
 * @title PlaygroundsRouter
 * @dev Router contract that wraps PulseXRouter swap and liquidity operations with 1000 PLS fee
 * @notice Collects 1000 PLS fee for every swap and liquidity operation, routed per-playground
 */
contract PlaygroundsRouter is ReentrancyGuard {
    using SafeERC20 for IERC20;

    /// @dev Fixed fee for all operations (1000 PLS)
    uint256 public constant FEE = 1000 ether;

    /// @dev PlaygroundFeeVault for per-playground fee tracking
    IPlaygroundFeeVault public constant feeVault =
        IPlaygroundFeeVault(0xcd1e0f80E101f51d02d4F4037C60F2DCd4cae400);

    /// @dev PulseXRouter address
    IPulseXRouter public constant router =
        IPulseXRouter(0x165C3410fC91EF562C50559f7d2289fEbed552d9);

    /// @dev Wrapped PLS address
    address public constant WPLS = 0xA1077a294dDE1B09bB078844df40758a5D0f9a27;

    /**
     * @dev Event emitted when a swap is executed
     */
    event SwapExecuted(
        address indexed user,
        address indexed tokenIn,
        address indexed tokenOut,
        uint256 amountIn,
        uint256 amountOut,
        uint256 fee
    );

    /**
     * @dev Event emitted when liquidity is added
     */
    event LiquidityAdded(
        address indexed user,
        address indexed tokenA,
        address indexed tokenB,
        uint256 amountA,
        uint256 amountB,
        uint256 liquidity,
        uint256 fee
    );

    /**
     * @dev Swap exact ETH/PLS for tokens
     * @param amountOutMin Minimum output amount
     * @param path Token path for swap
     * @param to Recipient address
     * @param deadline Transaction deadline
     * @param baseToken Base token address for fee routing (playground identifier)
     */
    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        address baseToken
    ) external payable nonReentrant returns (uint256[] memory amounts) {
        require(msg.value > FEE, "PlaygroundsRouter: Insufficient PLS for fee");

        // Calculate swap amount (msg.value - fee)
        uint256 swapAmount = msg.value - FEE;

        // Deposit fee to vault with playground tracking
        feeVault.deposit{value: FEE}(baseToken);

        // Execute swap with remaining PLS
        amounts = router.swapExactETHForTokens{value: swapAmount}(
            amountOutMin,
            path,
            to,
            deadline
        );

        emit SwapExecuted(
            msg.sender,
            address(0), // ETH/PLS
            path[path.length - 1],
            swapAmount,
            amounts[amounts.length - 1],
            FEE
        );

        return amounts;
    }

    /**
     * @dev Swap exact tokens for ETH/PLS
     * @param amountIn Input token amount
     * @param amountOutMin Minimum output amount
     * @param path Token path for swap
     * @param to Recipient address
     * @param deadline Transaction deadline
     * @param baseToken Base token address for fee routing (playground identifier)
     */
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        address baseToken
    ) external payable nonReentrant returns (uint256[] memory amounts) {
        require(
            msg.value >= FEE,
            "PlaygroundsRouter: Insufficient PLS for fee"
        );

        // Deposit fee to vault with playground tracking
        feeVault.deposit{value: FEE}(baseToken);

        // Transfer input tokens from user
        IERC20(path[0]).safeTransferFrom(msg.sender, address(this), amountIn);

        // Approve router to spend tokens
        IERC20(path[0]).approve(address(router), amountIn);

        // Execute swap
        amounts = router.swapExactTokensForETH(
            amountIn,
            amountOutMin,
            path,
            to,
            deadline
        );

        emit SwapExecuted(
            msg.sender,
            path[0],
            address(0), // ETH/PLS
            amountIn,
            amounts[amounts.length - 1],
            FEE
        );

        // Refund excess PLS if any
        if (msg.value > FEE) {
            (bool refundSuccess, ) = payable(msg.sender).call{
                value: msg.value - FEE
            }("");
            require(refundSuccess, "PlaygroundsRouter: Refund failed");
        }

        return amounts;
    }

    /**
     * @dev Swap exact tokens for tokens
     * @param amountIn Input token amount
     * @param amountOutMin Minimum output amount
     * @param path Token path for swap
     * @param to Recipient address
     * @param deadline Transaction deadline
     * @param baseToken Base token address for fee routing (playground identifier)
     */
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline,
        address baseToken
    ) external payable nonReentrant returns (uint256[] memory amounts) {
        require(
            msg.value >= FEE,
            "PlaygroundsRouter: Insufficient PLS for fee"
        );

        // Deposit fee to vault with playground tracking
        feeVault.deposit{value: FEE}(baseToken);

        // Transfer input tokens from user
        IERC20(path[0]).safeTransferFrom(msg.sender, address(this), amountIn);

        // Approve router to spend tokens
        IERC20(path[0]).approve(address(router), amountIn);

        // Execute swap
        amounts = router.swapExactTokensForTokens(
            amountIn,
            amountOutMin,
            path,
            to,
            deadline
        );

        emit SwapExecuted(
            msg.sender,
            path[0],
            path[path.length - 1],
            amountIn,
            amounts[amounts.length - 1],
            FEE
        );

        // Refund excess PLS if any
        if (msg.value > FEE) {
            (bool refundSuccess, ) = payable(msg.sender).call{
                value: msg.value - FEE
            }("");
            require(refundSuccess, "PlaygroundsRouter: Refund failed");
        }

        return amounts;
    }

    /**
     * @dev Add liquidity with ETH/PLS
     * @param token ERC20 token address
     * @param amountTokenDesired Desired token amount
     * @param amountTokenMin Minimum token amount
     * @param amountETHMin Minimum ETH/PLS amount
     * @param to LP token recipient
     * @param deadline Transaction deadline
     * @param baseToken Base token address for fee routing (playground identifier)
     */
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        address baseToken
    )
        external
        payable
        nonReentrant
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity)
    {
        require(msg.value > FEE, "PlaygroundsRouter: Insufficient PLS for fee");

        // Calculate ETH amount for liquidity (msg.value - fee)
        uint256 ethAmount = msg.value - FEE;

        // Deposit fee to vault with playground tracking
        feeVault.deposit{value: FEE}(baseToken);

        // Transfer tokens from user
        IERC20(token).safeTransferFrom(
            msg.sender,
            address(this),
            amountTokenDesired
        );

        // Approve router to spend tokens
        IERC20(token).approve(address(router), amountTokenDesired);

        // Add liquidity
        (amountToken, amountETH, liquidity) = router.addLiquidityETH{
            value: ethAmount
        }(
            token,
            amountTokenDesired,
            amountTokenMin,
            amountETHMin,
            to,
            deadline
        );

        emit LiquidityAdded(
            msg.sender,
            token,
            address(0), // ETH/PLS
            amountToken,
            amountETH,
            liquidity,
            FEE
        );

        // Refund unused tokens
        uint256 tokenBalance = IERC20(token).balanceOf(address(this));
        if (tokenBalance > 0) {
            IERC20(token).safeTransfer(msg.sender, tokenBalance);
        }

        // Refund unused ETH
        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {
            (bool refundSuccess, ) = payable(msg.sender).call{
                value: ethBalance
            }("");
            require(refundSuccess, "PlaygroundsRouter: ETH refund failed");
        }

        return (amountToken, amountETH, liquidity);
    }

    /**
     * @dev Add liquidity with two ERC20 tokens
     * @param tokenA First token address
     * @param tokenB Second token address
     * @param amountADesired Desired amount of tokenA
     * @param amountBDesired Desired amount of tokenB
     * @param amountAMin Minimum amount of tokenA
     * @param amountBMin Minimum amount of tokenB
     * @param to LP token recipient
     * @param deadline Transaction deadline
     * @param baseToken Base token address for fee routing (playground identifier)
     */
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        address baseToken
    )
        external
        payable
        nonReentrant
        returns (uint256 amountA, uint256 amountB, uint256 liquidity)
    {
        require(
            msg.value >= FEE,
            "PlaygroundsRouter: Insufficient PLS for fee"
        );

        // Deposit fee to vault with playground tracking
        feeVault.deposit{value: FEE}(baseToken);

        // Transfer tokens from user
        IERC20(tokenA).safeTransferFrom(
            msg.sender,
            address(this),
            amountADesired
        );
        IERC20(tokenB).safeTransferFrom(
            msg.sender,
            address(this),
            amountBDesired
        );

        // Approve router to spend tokens
        IERC20(tokenA).approve(address(router), amountADesired);
        IERC20(tokenB).approve(address(router), amountBDesired);

        // Add liquidity
        (amountA, amountB, liquidity) = router.addLiquidity(
            tokenA,
            tokenB,
            amountADesired,
            amountBDesired,
            amountAMin,
            amountBMin,
            to,
            deadline
        );

        emit LiquidityAdded(
            msg.sender,
            tokenA,
            tokenB,
            amountA,
            amountB,
            liquidity,
            FEE
        );

        // Refund unused tokens
        uint256 tokenABalance = IERC20(tokenA).balanceOf(address(this));
        if (tokenABalance > 0) {
            IERC20(tokenA).safeTransfer(msg.sender, tokenABalance);
        }

        uint256 tokenBBalance = IERC20(tokenB).balanceOf(address(this));
        if (tokenBBalance > 0) {
            IERC20(tokenB).safeTransfer(msg.sender, tokenBBalance);
        }

        // Refund excess PLS if any
        if (msg.value > FEE) {
            (bool refundSuccess, ) = payable(msg.sender).call{
                value: msg.value - FEE
            }("");
            require(refundSuccess, "PlaygroundsRouter: Refund failed");
        }

        return (amountA, amountB, liquidity);
    }

    /**
     * @dev Receive function to accept PLS refunds from router
     */
    receive() external payable {}
}
        

// 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
// 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) (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/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) (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 v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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 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;

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

    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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // 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 {
        // 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) {
        return _status == ENTERED;
    }
}