// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
    }

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

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        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);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";

contract TokenSwapper is Ownable {
    IERC20 immutable public token;
    IUniswapV2Router02 immutable public uniswapRouter;
    address immutable public lpAddress;
    IUniswapV2Pair immutable public uniswapPair;
    address public teamSplitter;
    address public brownHole;
    bool private locked;
    uint256 public slippageTolerance;
    uint256 public rewardPercentage;
    uint256 public liquidityPercentage;
    uint256 public sweepPercentage;
    mapping(address => bool) public _authorizedCaller; // establish list of addresses that can call checkAndSwap

    constructor(
        address _tokenAddress,
        address _uniswapRouterAddress,
        address _lpAddress,
        address _teamSplitter,
        address _brownHole,
        uint256 _slippageTolerance,
        uint256 _rewardPercentage,
        uint256 _liquidityPercentage,
        uint256 _sweepPercentage
    ) Ownable() {
        require(_sweepPercentage + liquidityPercentage + rewardPercentage <= 100 * 1e18, "Combined percentages cannot exceed 100");
        token = IERC20(_tokenAddress);
        uniswapRouter = IUniswapV2Router02(_uniswapRouterAddress);
        lpAddress = _lpAddress;
        uniswapPair = IUniswapV2Pair(lpAddress);
        teamSplitter = _teamSplitter;
        brownHole = _brownHole;
        slippageTolerance = _slippageTolerance;
        rewardPercentage = _rewardPercentage;
        liquidityPercentage = _liquidityPercentage;
        sweepPercentage = _sweepPercentage;
    }

    modifier nonReentrant() {
        require(!locked, "ReentrancyGuard: reentrant call");
        locked = true;
        _;
        locked = false;
    }

    function checkAndSwapTokens() public nonReentrant {
        require(_authorizedCaller[msg.sender], "Your address is not authorized to call this function");
        uint256 tokenBalance = token.balanceOf(address(this));
        _checkAndSwapTokens(tokenBalance);
    }

    function checkAndSwapTokens(uint256 _swapAmount) public nonReentrant {
        require(_authorizedCaller[msg.sender], "Your address is not authorized to call this function");
        _checkAndSwapTokens(_swapAmount);
    }

    function _checkAndSwapTokens(uint256 _swapAmount) internal {
        uint256 tokenBalance = token.balanceOf(address(this));
        require(_swapAmount <= tokenBalance, "Insufficient token balance");
        require(_swapAmount > 0, "Amount must be greater than zero");

        // Calculate amounts for swap and liquidity
        uint256 tokensForLiquidity = (_swapAmount * ( liquidityPercentage / 2) ) / 1e18;
        uint256 tokensForSwap = _swapAmount - tokensForLiquidity;

        // estimate amount of ETH that can be received for the tokens
        address[] memory path = new address[](2);
        path[0] = address(token);
        path[1] = uniswapRouter.WETH();
        uint256[] memory amountsOut = uniswapRouter.getAmountsOut(tokensForSwap, path);
        uint256 ethOutMin = amountsOut[1] - (amountsOut[1] * slippageTolerance / 1e18);

        // proceed with the swap if sliippage is within tolerance
        uint256 ethReceived = _swapTokensForEth(tokensForSwap, ethOutMin);

        // // add liquidity
        if (tokensForLiquidity > 0 && ethReceived > 0) {
            (uint256 ethForLiquidity, uint256 minTokensForLiquidity, uint256 minEthForLiquidity) = calculateEthForLiquidity(tokensForLiquidity);

            token.approve(address(uniswapRouter), tokensForLiquidity);
            
            uniswapRouter.addLiquidityETH{ value: ethForLiquidity }(
                address(token),
                tokensForLiquidity,
                minTokensForLiquidity,
                minEthForLiquidity,
                address(this),
                block.timestamp
            );
        }

        // transfer reward to the caller
        uint256 reward = (ethReceived * rewardPercentage) / 1e18;
        (bool rewardSent, ) = payable(msg.sender).call{value: reward}("");
        require(rewardSent, "Failed to send reward");

        // transfer sweep funds to brown hole
        uint256 sweepDenominator = 1e18 - (liquidityPercentage / 2);
        uint256 sweepNumerator = ethReceived * sweepPercentage;
        uint256 sweep = sweepNumerator / sweepDenominator;
        (bool sweepSent, ) = payable(brownHole).call{value: sweep}("");
        require(sweepSent, "Failed to send reward");

        // send remaining eth to teamSplitter
        (bool sent, ) = payable(teamSplitter).call{value: address(this).balance}("");
        require(sent, "Failed to send ETH");
    }

    function setSlippageTolerance(uint256 _slippageTolerance) public onlyOwner {
        slippageTolerance = _slippageTolerance;
    }

    function setRewardPercentage(uint256 _rewardPercentage) public onlyOwner {
        require(_rewardPercentage + sweepPercentage + liquidityPercentage <= 100 * 1e18, "Combined percentages cannot exceed 100");
        rewardPercentage = _rewardPercentage;
    }

    function setLiquidityPercentage(uint256 _liquidityPercentage) public onlyOwner {
        require(_liquidityPercentage + sweepPercentage + rewardPercentage <= 100 * 1e18, "Combined percentages cannot exceed 100");
        liquidityPercentage = _liquidityPercentage;
    }

    function setSweepPercentage(uint256 _sweepPercentage) public onlyOwner {
        require(_sweepPercentage + liquidityPercentage + rewardPercentage <= 100 * 1e18, "Combined percentages cannot exceed 100");
        sweepPercentage = _sweepPercentage;
    }

    function setTeamSplitter(address _teamSplitter) public onlyOwner {
        teamSplitter = _teamSplitter;
    }

    function setBrownHole(address _brownHole) public onlyOwner {
        brownHole = _brownHole;
    }

    function setAuthorizedCaller(address account, bool authorized) public onlyOwner {
        _authorizedCaller[account] = authorized;
    }

    function withdrawETH() public onlyOwner {
        uint256 ethBalance = address(this).balance;
        require(ethBalance > 0, "No ETH balance");
        payable(owner()).transfer(ethBalance);
    }

    function withdrawToken(address _tokenAddress) public onlyOwner {
        IERC20 _token = IERC20(_tokenAddress);
        uint256 tokenBalance = _token.balanceOf(address(this));
        require(tokenBalance > 0, "No token balance");
        _token.transfer(owner(), tokenBalance);
    }

    function withdrawNFT(address _nftAddress, uint256 _tokenId) public onlyOwner {
        IERC721 _nft = IERC721(_nftAddress);
        require(_nft.ownerOf(_tokenId) == address(this), "Contract does not own the NFT");
        _nft.transferFrom(address(this), owner(), _tokenId);
    }

    function _swapTokensForEth(uint256 _amount, uint256 _amountOutMin) private returns (uint256) {
        uint256 initialEthBalance = address(this).balance;

        token.approve(address(uniswapRouter), _amount);

        address[] memory path = new address[](2);
        path[0] = address(token);
        path[1] = uniswapRouter.WETH();

        uniswapRouter.swapExactTokensForETH(
            _amount,
            _amountOutMin,
            path,
            address(this),
            block.timestamp
        );

        uint256 ethReceived = address(this).balance - initialEthBalance;
        return ethReceived;
    }

    function calculateEthForLiquidity(uint256 tokensForLiquidity) private view returns (uint256, uint256, uint256) {
        (uint112 reserveETH, uint112 reserveToken) = getReservesForTokenETHPair(lpAddress, address(token));
        uint256 ethForLiquidity = (tokensForLiquidity * reserveETH) / reserveToken;
        uint256 minTokensForLiquidity = tokensForLiquidity * (1e18 - slippageTolerance) / 1e18;
        uint256 minEthForLiquidity = ethForLiquidity * (1e18 - slippageTolerance) / 1e18;
        return (ethForLiquidity, minTokensForLiquidity, minEthForLiquidity);
    }

    function getReservesForTokenETHPair(address pairAddress, address tokenAddress) public view returns (uint112 reserveETH, uint112 reserveToken) {
        IUniswapV2Pair pair = IUniswapV2Pair(pairAddress);
        address token0 = pair.token0();
        require(token0 == tokenAddress || pair.token1() == tokenAddress, "Specified token is not part of the pair");

        (uint112 reserve0, uint112 reserve1,) = pair.getReserves();
        
        // Determine which reserve is ETH and which is the token
        if (token0 == uniswapRouter.WETH()) {
            reserveETH = reserve0;
            reserveToken = reserve1;
        } else {
            reserveETH = reserve1;
            reserveToken = reserve0;
        }        
    }

    receive() external payable {}
}

{
  "compilationTarget": {
    "contracts/TokenSwapper.sol": "TokenSwapper"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}