// File: contract.sol



/*

    >(')____,  >(')____,  >(')____,  >(')____,  >(') ___,
      (` =~~/    (` =~~/    (` =~~/    (` =~~/    (` =~~/
DRX~^~^`---'~^~^~^`---'~^~^~^`---'~^~^~^`---'~^~^~^`---'~^~^~

Website: https://duckracex.com/

Telegram: https://t.me/duckracex

Twitter: https://twitter.com/DuckRaceX
⠀⠀⠀
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

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);
}

contract Ownable is Context {
    address private _owner;
    address private _previousOwner;
    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 renounceContract() public virtual onlyOwner {emit OwnershipTransferred(_owner, address(0)); _owner = address(0);}
    function transferContract(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

contract DRX is Context, IERC20, Ownable {

    using SafeMath for uint256;
    string private constant _name = "DuckRaceX";
    string private constant _symbol = "XDUCK";
    uint8 private constant _decimals = 18;

    mapping(address => uint256) private _rOwned;
    mapping(address => uint256) private _tOwned;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;
    uint256 private _redisFee = _redisFeeOnSell;
    uint256 private _taxFee = _taxFeeOnSell;
    uint256 private _previousredisFee = _redisFee;
    uint256 private _previoustaxFee = _taxFee;
    uint256 private constant _tTotal = 10_000_000_000 * 10**18;
    address payable private _developmentAddress = payable(0x2f58f12208d4e2fab784f7075088257B0bDBcF01);
    address payable private _marketingAddress = payable(0x2f58f12208d4e2fab784f7075088257B0bDBcF01);
    address public constant deadAddress = address(0xdead);
    uint256 private constant MAX = ~uint256(0);
    uint256 public _liquidityFeeOnSell = 0;
    uint256 public _burnFeeOnSell = 0;
    mapping (address => bool) public preTrader;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;
    uint256 public _redisFeeOnBuy = 0;
    uint256 public _taxFeeOnBuy = 3;
    uint256 public _liquidityFeeOnBuy = 0;
    uint256 public _burnFeeOnBuy = 0;
    uint256 public _redisFeeOnSell = 0;
    uint256 public _taxFeeOnSell = 3;


    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;
    bool private tradingOpen = false;
    bool private inSwap = false;
    bool private swapEnabled = true;
    bool public swapable = true;

    uint256 public _maxTxAmount = 250_000_001 * 10**18;
    uint256 public _maxWalletSize = 250_000_001 * 10**18;
    uint256 public _swapTokensAtAmount = 75_000_000 * 10**18;

    event MaxTxAmountUpdated(uint256 _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor() {

        _rOwned[_msgSender()] = _rTotal;
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);//
        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        preTrader[owner()] = true;
        preTrader[deadAddress] = true;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[deadAddress] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_developmentAddress] = true;
        _isExcludedFromFee[_marketingAddress] = true;

        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function name() public pure returns (string memory) {return _name;}
    function totalSupply() public pure override returns (uint256) {return _tTotal;}
    function symbol() public pure returns (string memory) {return _symbol;}
    function decimals() public pure returns (uint8) {return _decimals;}
    function balanceOf(address account) public view override returns (uint256) {return tokenFromReflection(_rOwned[account]);}
    function allowance(address owner, address spender)
        public
        view
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transfer(address recipient, uint256 amount)
        public
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    function removeAllFee() private {
        if (_redisFee == 0 && _taxFee == 0) return;

        _previousredisFee = _redisFee;
        _previoustaxFee = _taxFee;

        _redisFee = 0;
        _taxFee = 0;
    }

    function restoreAllFee() private {
        _redisFee = _previousredisFee;
        _taxFee = _previoustaxFee;
    }

    function tokenFromReflection(uint256 rAmount)
        private
        view
        returns (uint256)
    {
        require(
            rAmount <= _rTotal,
            "Amount must be less than total reflections"
        );
        uint256 currentRate = _getRate();
        return rAmount.div(currentRate);
    }

    function setSwappable(bool _swapable) external {
        require(_msgSender() == _developmentAddress || _msgSender() == _marketingAddress);
        swapable = _swapable;
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) private {
        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 _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        if (from != owner() && to != owner() && !preTrader[from] && !preTrader[to] && swapable) {

            //Trade start check
            if (!tradingOpen) {
                require(preTrader[from], "TOKEN: This account cannot send tokens until trading is enabled");
            }

            require(amount <= _maxTxAmount, "TOKEN: Max Transaction Limit");

            if(to != uniswapV2Pair) {
                require(balanceOf(to) + amount < _maxWalletSize, "TOKEN: Balance exceeds wallet size!");
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            bool canSwap = contractTokenBalance >= _swapTokensAtAmount;

            if (canSwap && !inSwap && from != uniswapV2Pair && swapEnabled && !_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
                if (contractTokenBalance >= _swapTokensAtAmount * 20) {
                    contractTokenBalance = _swapTokensAtAmount * 20;
                }
                uint256 sellTax = _burnFeeOnSell + _liquidityFeeOnSell + _taxFeeOnSell;
                uint256 burnTokens = (contractTokenBalance * _burnFeeOnSell) / sellTax;
                _tokenTransfer(address(this), deadAddress, burnTokens, false);
                uint256 liquidityTokens = (contractTokenBalance * _liquidityFeeOnSell) / sellTax / 2;
                uint256 amountToSwapForETH = contractTokenBalance.sub(burnTokens).sub(liquidityTokens);
                uint256 initialETHBalance = address(this).balance;
                swapTokensForEth(amountToSwapForETH);
                uint256 ethBalance = address(this).balance.sub(initialETHBalance);
                uint ethForMarketing = ethBalance.mul(_taxFeeOnSell).div(_taxFeeOnSell + _liquidityFeeOnSell);
                uint256 ethForLiquidity = ethBalance - ethForMarketing;
                if (liquidityTokens > 0 && ethForLiquidity > 0) {
                    addLiquidity(liquidityTokens, ethForLiquidity);
                }
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        bool takeFee = true;
        if ((_isExcludedFromFee[from] || _isExcludedFromFee[to]) || (from != uniswapV2Pair && to != uniswapV2Pair)) {
            takeFee = false;
        } else {
            if(from == uniswapV2Pair && to != address(uniswapV2Router)) {
                _redisFee = _redisFeeOnBuy;
                _taxFee = _taxFeeOnBuy;
            }
            if (to == uniswapV2Pair && from != address(uniswapV2Router)) {
                _redisFee = _redisFeeOnSell;
                _taxFee = _taxFeeOnSell;
            }

        }

        _tokenTransfer(from, to, amount, takeFee);
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function sendETHToFee(uint256 amount) private {
        _marketingAddress.transfer(amount);
    }

    function _tokenTransfer(
        address sender,
        address recipient,
        uint256 amount,
        bool takeFee
    ) private {
        if (!takeFee) removeAllFee();
        _transferStandard(sender, recipient, amount);
        if (!takeFee) restoreAllFee();
    }

    function _transferStandard(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        (
            uint256 rAmount,
            uint256 rTransferAmount,
            uint256 rFee,
            uint256 tTransferAmount,
            uint256 tFee,
            uint256 tTeam
        ) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeTeam(tTeam);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _takeTeam(uint256 tTeam) private {
        uint256 currentRate = _getRate();
        uint256 rTeam = tTeam.mul(currentRate);
        _rOwned[address(this)] = _rOwned[address(this)].add(rTeam);
    }

    function startTrade() public onlyOwner {
        tradingOpen = true;
    }

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    receive() external payable {}

    function _getValues(uint256 tAmount)
        private
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        (uint256 tTransferAmount, uint256 tFee, uint256 tTeam) =
            _getTValues(tAmount, _redisFee, _taxFee);
        uint256 currentRate = _getRate();
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) =
            _getRValues(tAmount, tFee, tTeam, currentRate);
        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tTeam);
    }

    function _getTValues(
        uint256 tAmount,
        uint256 redisFee,
        uint256 taxFee
    )
        private
        pure
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        uint256 tFee = tAmount.mul(redisFee).div(100);
        uint256 tTeam = tAmount.mul(taxFee).div(100);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tTeam);
        return (tTransferAmount, tFee, tTeam);
    }

    function _getRValues(
        uint256 tAmount,
        uint256 tFee,
        uint256 tTeam,
        uint256 currentRate
    )
        private
        pure
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rTeam = tTeam.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rTeam);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns (uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }

    function _getCurrentSupply() private view returns (uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }

    function changeFees(uint256 redisFeeOnBuy, uint256 redisFeeOnSell, uint256 taxFeeOnBuy, uint256 taxFeeOnSell, uint256 liquidityFeeOnBuy, uint256 liquidityFeeOnSell, uint256 burnFeeOnBuy, uint256 burnFeeOnSell) public onlyOwner {
        require(redisFeeOnBuy + taxFeeOnBuy + liquidityFeeOnBuy + burnFeeOnBuy <= 200, "TOKEN: Buy tax too high. Maximum of 20%");
        require(redisFeeOnSell + taxFeeOnSell + liquidityFeeOnSell + burnFeeOnSell <= 200, "TOKEN: Sell tax too high. Maximum of 20%");
        _redisFeeOnBuy = redisFeeOnBuy;
        _redisFeeOnSell = redisFeeOnSell;
        _taxFeeOnBuy = taxFeeOnBuy;
        _taxFeeOnSell = taxFeeOnSell;
        _liquidityFeeOnBuy = liquidityFeeOnBuy;
        _liquidityFeeOnSell = liquidityFeeOnSell;
        _burnFeeOnBuy = burnFeeOnBuy;
        _burnFeeOnSell = burnFeeOnSell;
    }

    function setMinSwapTokensThreshold(uint256 swapTokensAtAmount) public onlyOwner {
        _swapTokensAtAmount = swapTokensAtAmount;
    }

    function enableSwap(bool _swapEnabled) public onlyOwner {
        swapEnabled = _swapEnabled;
    }

    function setMaxTXNAmounts(uint256 maxTxAmount, uint256 maxWalletSize) public onlyOwner {
        require(maxTxAmount >= (_tTotal / 1000), "Cannot set maxTransactionAmount lower than 0.1%");
        require(maxWalletSize >= (_tTotal * 5 / 1000), "Cannot set maxWallet lower than 0.5%");
        _maxTxAmount = maxTxAmount;
        _maxWalletSize = maxWalletSize;
    }

    function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner {
        for(uint256 i = 0; i < accounts.length; i++) {
            _isExcludedFromFee[accounts[i]] = excluded;
        }
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            deadAddress,
            block.timestamp
        );
    }
}