// SPDX-License-Identifier: MIT

pragma solidity 0.8.18;

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address pair);

    function allPairs(uint) external view returns (address pair);

    function allPairsLength() external view returns (uint);

    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

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);
}

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;
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);

    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(
        address account
    ) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(
        address spender,
        uint256 amount
    ) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        if (currentAllowance != type(uint256).max) {
            require(
                currentAllowance >= amount,
                "ERC20: transfer amount exceeds allowance"
            );
            unchecked {
                _approve(sender, _msgSender(), currentAllowance - amount);
            }
        }

        _transfer(sender, recipient, amount);

        return true;
    }

    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public virtual returns (bool) {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender] + addedValue
        );
        return true;
    }

    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

contract QuestCrossChain is ERC20, Ownable {
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;

    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) private _isExcludedFromMaxWallet;
    mapping(address => bool) private _isWhitelisted;

    uint256 public sellFee;
    uint256 public buyFee;
    uint256 public maxWalletAmount;

    uint256 public walletToWalletTransferFee;
    address public marketingWallet;

    bool public enableTrading;

    event ExcludeFromFees(address indexed account, bool isExcluded);
    event SellFeeUpdated(uint256 sellFee);
    event BuyFeeUpdated(uint256 buyFee);
    event WalletToWalletTransferFeeUpdated(uint256 walletToWalletTransferFee);

    event MarketingWalletChanged(address marketingWallet);

    constructor() ERC20("Quest Cross-Chain", "$QUEST") {
        address newOwner = 0xE0682d31266229C8aB90CF2beA2E3121C8d1568D;
        transferOwnership(newOwner);

        address router;
        if (block.chainid == 56) {
            router = 0x10ED43C718714eb63d5aA57B78B54704E256024E; // BSC Pancake Mainnet Router
        } else if (block.chainid == 97) {
            router = 0xD99D1c33F9fC3444f8101754aBC46c52416550D1; // BSC Pancake Testnet Router
        } else if (block.chainid == 1 || block.chainid == 5) {
            router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; // ETH Uniswap Mainnet & Testnet
        } else {
            revert();
        }

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(router);
        address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = _uniswapV2Pair;

        _approve(address(this), address(uniswapV2Router), type(uint256).max);

        sellFee = 6;
        buyFee = 6;
        walletToWalletTransferFee = 6;

        marketingWallet = 0x41FCC1d384368fcD4036B8ec63Ef7064E56D2b93;

        _isExcludedFromFees[owner()] = true;
        _isExcludedFromFees[address(0xdead)] = true;
        _isExcludedFromFees[address(this)] = true;
        _isExcludedFromFees[marketingWallet] = true;
        _isWhitelisted[owner()] = true;
        _isWhitelisted[marketingWallet] = true;
        _isExcludedFromMaxWallet[owner()] = true;
        _isExcludedFromMaxWallet[marketingWallet] = true;

        _mint(owner(), 200_000_000 * 10 ** 18);
        emit Transfer(address(0), owner(), totalSupply());
        maxWalletAmount = totalSupply() / 1000;
    }

    receive() external payable {}

    function EnablePublicTrading() public onlyOwner {
        require(enableTrading == false, "Public Trading is already enabled");
        enableTrading = true;
    }

    function claimStuckTokens(address token) external onlyOwner {
        if (token == address(0x0)) {
            (bool success, ) = msg.sender.call{value: address(this).balance}(
                ""
            );
            require(success, "Claim failed");
            return;
        }
        IERC20 ERC20token = IERC20(token);
        uint256 balance = ERC20token.balanceOf(address(this));
        ERC20token.transfer(msg.sender, balance);
    }

    function excludeFromFees(
        address account,
        bool excluded
    ) external onlyOwner {
        require(
            _isExcludedFromFees[account] != excluded,
            "Account is already the value of 'excluded'"
        );
        _isExcludedFromFees[account] = excluded;

        emit ExcludeFromFees(account, excluded);
    }

    function isExcludedFromFees(address account) public view returns (bool) {
        return _isExcludedFromFees[account];
    }

    function setWhitelistWallets(address[] memory wallets) external onlyOwner {
        for (uint256 i = 0; i < wallets.length; i++) {
            _isWhitelisted[wallets[i]] = true;
        }
    }

    function isWhitelisted(address account) public view returns (bool) {
        return _isWhitelisted[account];
    }

    function excludeFromMaxWallet(
        address account,
        bool excluded
    ) external onlyOwner {
        require(
            _isExcludedFromMaxWallet[account] != excluded,
            "Account is already the value of 'excluded'"
        );
        _isExcludedFromMaxWallet[account] = excluded;
    }

    function isExcludedFromMaxWallet(
        address account
    ) public view returns (bool) {
        return _isExcludedFromMaxWallet[account];
    }

    function setSellFee(uint256 _sellFee) external onlyOwner {
        require(_sellFee <= 6, "Sell Fee cannot be more than 6%");
        sellFee = _sellFee;
        emit SellFeeUpdated(sellFee);
    }

    function setBuyFee(uint256 _buyFee) external onlyOwner {
        require(_buyFee <= 6, "Buy Fee cannot be more than 6%");
        buyFee = _buyFee;
        emit BuyFeeUpdated(buyFee);
    }

    function setWalletToWalletTransferFee(
        uint256 _walletToWalletTransferFee
    ) external onlyOwner {
        require(
            _walletToWalletTransferFee <= 6,
            "Wallet to Wallet Transfer Fee cannot be more than 6%"
        );
        walletToWalletTransferFee = _walletToWalletTransferFee;
        emit WalletToWalletTransferFeeUpdated(walletToWalletTransferFee);
    }

    function setMaxWalletAmount(uint256 _maxWalletAmount) external onlyOwner {
        require(
            _maxWalletAmount >= totalSupply() / 10000,
            "Max wallet amount cannot be less than 0.01% of total supply"
        );
        maxWalletAmount = _maxWalletAmount;
    }

    function changeMarketingWallet(
        address _marketingWallet
    ) external onlyOwner {
        require(
            _marketingWallet != marketingWallet,
            "Marketing wallet is already that address"
        );
        require(
            _marketingWallet != address(0),
            "Marketing wallet cannot be the zero address"
        );
        marketingWallet = _marketingWallet;
        emit MarketingWalletChanged(marketingWallet);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        if (!_isWhitelisted[from] && !_isWhitelisted[to]) {
            require(enableTrading, "Trading is not public yet");
        }

        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        uint256 _totalFees;
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            _totalFees = 0;
        } else if (from == uniswapV2Pair) {
            _totalFees = buyFee;
        } else if (to == uniswapV2Pair) {
            _totalFees = sellFee;
        } else {
            _totalFees = walletToWalletTransferFee;
        }

        if (_totalFees > 0) {
            uint256 fees = (amount * _totalFees) / 100;
            amount = amount - fees;
            super._transfer(from, marketingWallet, fees);
        }

        if (
            !_isExcludedFromMaxWallet[from] &&
            !_isExcludedFromMaxWallet[to] &&
            to != uniswapV2Pair
        ) {
            require(
                balanceOf(to) + amount <= maxWalletAmount,
                "Transfer amount exceeds the maxWalletAmount."
            );
        }

        super._transfer(from, to, amount);
    }
}