/*

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    888       Y88o88P   88888b  888      
    888        Y888P    888Y88b 888      
    888        d888b    888 Y88b888      
    888       d88888b   888  Y88888      
    888      d88P Y88b  888   Y8888      
    888     d88P   Y88b 888    Y888      
                                         
                                         
                                         
 .d8888b.  888     888     888 888888b.  
d88P  Y88b 888     888     888 888  "88b 
888    888 888     888     888 888  .88P 
888        888     888     888 8888888K. 
888        888     888     888 888  "Y88b
888    888 888     888     888 888    888
Y88b  d88P 888     Y88b. .d88P 888   d88P
 "Y8888P"  88888888 "Y88888P"  8888888P"                                                                                                                                           
*/
// SPDX-License-Identifier:MIT
pragma solidity 0.8.19;

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
    );
}

// Dex Factory contract interface
interface IDexFactory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

// Dex Router contract interface
interface IDexRouter {
    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);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }

    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 = payable(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;
    }
}

abstract contract ReentrancyGuard {
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = _NOT_ENTERED;
    }

    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 {
        _status = _NOT_ENTERED;
    }

    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

contract TXN is Context, IERC20, Ownable, ReentrancyGuard {
    string private _name = "TXN Club";
    string private _symbol = "TXN";
    uint8 private _decimals = 18;
    uint256 private _totalSupply = 100_000_000 ether; //100 million

    uint256 public taxFeeOnBuy = 0;
    uint256 public taxFeeOnSell = 0;

    uint256 public minSwapAmount = _totalSupply / (2000);
    uint256 public percentDivider = 100;

    bool public distributeAndLiquifyStatus = true;
    bool public feesStatus = true; // enable by default

    IDexRouter public dexRouter; //Uniswap  router declaration
    address public dexPair; //Uniswap  pair address declaration
    address public feeReceiver = address(0xd7eb4e3f5B1d57c282493b889e467fE5Bb293F46); // fee receiver

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) public isExcludedFromFee;

    event ExcludeFromFee(address indexed account, bool isExcluded);
    event NewSwapAmount(uint256 newAmount);
    event DistributionStatus(bool Status);
    event FeeStatus(bool Status);
    event FeeUpdated(uint256 amount);

    event feeReceiverUpdated(
        address indexed newWallet,
        address indexed oldWallet
    );

    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );

    constructor() {
        _balances[owner()] = _totalSupply;

        IDexRouter _dexRouter = IDexRouter(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        // Create a dex pair for this new ERC20
        address _dexPair = IDexFactory(_dexRouter.factory()).createPair(
            address(this),
            _dexRouter.WETH()
        );
        dexPair = _dexPair;

        // set the rest of the contract variables
        dexRouter = _dexRouter;

        //exclude owner and this contract from fee
        isExcludedFromFee[owner()] = true;
        isExcludedFromFee[address(this)] = true;
        isExcludedFromFee[address(dexRouter)] = true;

        emit Transfer(address(0), owner(), _totalSupply);
    }

    //to receive ETH from dexRouter when swapping
    receive() external payable {}

    // Public viewable functions

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    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 transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()] - 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) {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender] - subtractedValue
        );
        return true;
    }

    function totalBuyFeePerTx(uint256 amount) public view returns (uint256) {
        uint256 fee = (amount * taxFeeOnBuy) / percentDivider;
        return fee;
    }

    function totalSellFeePerTx(uint256 amount) public view returns (uint256) {
        uint256 fee = (amount * taxFeeOnSell) / percentDivider;
        return fee;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0), "Approve from the zero address");
        require(spender != address(0), "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), "Tansfer from the zero address");
        require(to != address(0), "Transfer to the zero address");
        require(amount > 0, " Amount must be greater than zero");

        // swap and liquify
        distributeAndLiquify(from, to);

        //indicates if fee should be deducted from transfer
        bool takeFee = true;

        //if any account belongs to isExcludedFromFee account then remove the fee
        if (isExcludedFromFee[from] || isExcludedFromFee[to] || !feesStatus) {
            takeFee = false;
        }

        //transfer amount, it will take tax, burn, liquidity fee
        _tokenTransfer(from, to, amount, takeFee);
    }

    //this method is responsible for processing all fee, if takeFee is true
    function _tokenTransfer(
        address sender,
        address recipient,
        uint256 amount,
        bool takeFee
    ) private {
        if (dexPair == sender && takeFee) {
            uint256 allFee;
            uint256 tTransferAmount;
            allFee = totalBuyFeePerTx(amount);
            tTransferAmount = amount - allFee;

            _balances[sender] = _balances[sender] - amount;
            _balances[recipient] = _balances[recipient] + tTransferAmount;
            emit Transfer(sender, recipient, tTransferAmount);

            takeTokenFee(sender, allFee);
        } else if (dexPair == recipient && takeFee) {
            uint256 allFee = totalSellFeePerTx(amount);
            uint256 tTransferAmount = amount - allFee;
            _balances[sender] = _balances[sender] - amount;
            _balances[recipient] = _balances[recipient] + tTransferAmount;
            emit Transfer(sender, recipient, tTransferAmount);

            takeTokenFee(sender, allFee);
        } else {
            _balances[sender] = _balances[sender] - amount;
            _balances[recipient] = _balances[recipient] + (amount);
            emit Transfer(sender, recipient, amount);
        }
    }

    function takeTokenFee(address sender, uint256 amount) private {
        _balances[address(this)] = _balances[address(this)] + amount;

        emit Transfer(sender, address(this), amount);
    }

    // Withdraw stuck ETH
    function withdrawETH(uint256 _amount) external onlyOwner {
        require(address(this).balance >= _amount, "Invalid Amount");
        payable(msg.sender).transfer(_amount);

        emit Transfer(address(this), msg.sender, _amount);
    }

    //callable by contract

    function distributeAndLiquify(address from, address to) private {
        uint256 contractTokenBalance = balanceOf(address(this));

        if (
            contractTokenBalance >= minSwapAmount &&
            from != dexPair &&
            distributeAndLiquifyStatus &&
            !(from == address(this) && to == dexPair) // swap 1 time
        ) {
            // approve contract
            _approve(address(this), address(dexRouter), minSwapAmount);

            // lock into liquidty pool
            Utils.swapTokensForEth(address(dexRouter), minSwapAmount);
            uint256 ethForMarketing = address(this).balance;

            // sending Eth to Marketing wallet
            if (ethForMarketing > 0)
                payable(feeReceiver).transfer(ethForMarketing);
        }
    }

    /* write Functions
   call by write contract section
   https://etherscan.io 
   */

    //to change buy fee
    function setBuyTax(uint256 _taxFee) external onlyOwner {
        require(_taxFee <= 10, "can't sell fee more than 10");
        taxFeeOnBuy = _taxFee;
        emit FeeUpdated(taxFeeOnBuy);
    }

    // to change sell fee
    function setSellTax(uint256 _taxFee) external onlyOwner {
        require(_taxFee <= 10, "can't sell fee more than 10");
        taxFeeOnSell = _taxFee;
        emit FeeUpdated(taxFeeOnSell);
    }

    //to include or exclue any address from fee
    function setIncludeOrExcludeFromFee(
        address account,
        bool value
    ) external onlyOwner {
        isExcludedFromFee[account] = value;
        emit ExcludeFromFee(account, value);
    }

    //to change swap fee
    function updateSwapAmount(uint256 _amount) external onlyOwner {
        require(_amount > 0, "min swap amount should be greater than zero");
        minSwapAmount = _amount * 1e18;
        emit NewSwapAmount(minSwapAmount);
    }

    function setDistributionStatus(bool _value) external onlyOwner {
        // Check if the new value is different from the current state
        require(
            _value != distributeAndLiquifyStatus,
            "Value must be different from current state"
        );
        distributeAndLiquifyStatus = _value;
        emit DistributionStatus(_value);
    }

    // to set contract tax free
    function enableOrDisableFees(bool _value) external onlyOwner {
        // Check if the new value is different from the current state
        require(
            _value != feesStatus,
            "Value must be different from current state"
        );
        feesStatus = _value;
        emit FeeStatus(_value);
    }

    // to change fee receiver wallet
    function updatefeeReceiver(address newfeeReceiver) external onlyOwner {
        require(
            newfeeReceiver != address(0),
            "Ownable: new feeReceiver is the zero address"
        );
        emit feeReceiverUpdated(newfeeReceiver, feeReceiver);
        feeReceiver = newfeeReceiver;
    }
}

// Library dex swap
library Utils {
    function swapTokensForEth(
        address routerAddress,
        uint256 tokenAmount
    ) internal {
        IDexRouter dexRouter = IDexRouter(routerAddress);

        // generate the Dex pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = dexRouter.WETH();

        // make the swap
        dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp + 300
        );
    }
}