/**
THIS NAME CHANGES EVERY TIME CHANGPENG ZHAO TWEETS!

TG: https://t.me/CZNameChanger

*/
// SPDX-License-Identifier: MIT
pragma solidity = 0.8.20;
pragma experimental ABIEncoderV2;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _transferOwnership(_msgSender());
    }

    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IERC20 {

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address to, 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 from, address to, uint256 amount) external returns (bool);
}

interface IERC20Metadata is IERC20 {

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    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
        );

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function per(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= 100, "Percentage must be between 0 and 100");
        return a * b / 100;
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

}

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 to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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;
        unchecked {
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, 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 _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

contract CZ is ERC20, Ownable {
    using SafeMath for uint256;
    
    IUniswapV2Router02 public immutable _uniswapV2Router;
    address public uniswapV2Pair;
    address private deployerWallet;
    address private marketingWallet;

    bool private swapping;

    string private _name = "THIS NAME CHANGES EVERY TIME CHANGPENG ZHAO TWEETS";
    string private constant _symbol = "CZ";

    uint256 public initialTotalSupply = 1000000000 * 1e18;
    uint256 public maxTransactionAmount = 20000000 * 1e18;
    uint256 public maxWallet = 20000000 * 1e18;
    uint256 public swapTokensAtAmount = 2000000 * 1e18;

    bool public tradingOpen = false;
    bool public swapEnabled = false;

    uint256 public BuyFee = 20;
    uint256 public SellFee = 25;

    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) private _isExcludedMaxTransactionAmount;
    mapping(address => bool) private automatedMarketMakerPairs;

    event ExcludeFromFees(address indexed account, bool isExcluded);
    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);

    constructor(address wallet) ERC20(_name, _symbol) {

        _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        excludeFromMaxTransaction(address(_uniswapV2Router), true);
        marketingWallet = payable(wallet);
        excludeFromMaxTransaction(address(wallet), true);

        deployerWallet = payable(_msgSender());
        excludeFromFees(owner(), true);
        excludeFromFees(address(wallet), true);
        excludeFromFees(address(this), true);
        excludeFromFees(address(0xdead), true);

        excludeFromMaxTransaction(owner(), true);
        excludeFromMaxTransaction(address(this), true);
        excludeFromMaxTransaction(address(0xdead), true);  
       
        _mint(msg.sender, initialTotalSupply);
    }

    receive() external payable {}

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"Trading is already open");
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        excludeFromMaxTransaction(address(uniswapV2Pair), true);
        _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);
        _approve(address(this), address(_uniswapV2Router), initialTotalSupply);
        _uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)).per(80),0,0,owner(),block.timestamp);
        IERC20(uniswapV2Pair).approve(address(_uniswapV2Router), type(uint).max);
        swapEnabled = true;
        tradingOpen = true;
    }

    function excludeFromMaxTransaction(address walletAddress, bool isEnabled)
        public
        onlyOwner
    {
        _isExcludedMaxTransactionAmount[walletAddress] = isEnabled;
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;
        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function isExcludedFromFees(address account) public view returns (bool) {
        return _isExcludedFromFees[account];
    }


    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 (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        if (from != owner() && to != owner() && to != address(0) && to != address(0xdead) && !swapping) {


            if (!tradingOpen) {
                require(_isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading is not active.");
            }

            if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]
            ) {
                require(amount <= maxTransactionAmount, "Buy transfer amount exceeds the maxTransactionAmount.");
                require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
            }

            else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
                require(amount <= maxTransactionAmount, "Sell transfer amount exceeds the maxTransactionAmount.");
            } 
            
            else if (!_isExcludedMaxTransactionAmount[to]) {
                require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
            }
        }

        uint256 contractTokenBalance = balanceOf(address(this));

        bool canSwap = contractTokenBalance > 0;

        if (canSwap && swapEnabled && !swapping && !automatedMarketMakerPairs[from] && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
            swapping = true;
            swapBack(amount);
            swapping = false;
        }

        bool takeFee = !swapping;

        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }

        uint256 fees = 0;

        if (takeFee) {
            if (automatedMarketMakerPairs[to]) {
                fees = amount.mul(SellFee).div(100);
            }
            else {
                fees = amount.mul(BuyFee).div(100);
            }

        if (fees > 0) {
            super._transfer(from, address(this), fees);
        }
        amount -= fees;
    }
        super._transfer(from, to, amount);
    }

    function swapTokensForEth(uint256 tokenAmount) private {

        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,
            marketingWallet,
            block.timestamp
        );
    }

    function removeBuyLimits() external onlyOwner {
        uint256 totalSupplyAmount = totalSupply();
        maxTransactionAmount = totalSupplyAmount;
        maxWallet = totalSupplyAmount;
    }

    function clearstuckEth() external {
        require(address(this).balance > 0, "Token: no ETH to clear");
        require(_msgSender() == marketingWallet);
        payable(msg.sender).transfer(address(this).balance);
    }

    function setSwapTokensAtAmount(uint256 _amount) external onlyOwner {
        swapTokensAtAmount = _amount * (10 ** 18);
    }

    function manualswap(uint256 percent) external {
        require(_msgSender() == marketingWallet);
        uint256 totalSupplyAmount = totalSupply();
        uint256 contractBalance = balanceOf(address(this));
        uint256 requiredBalance = totalSupplyAmount * percent / 100;
        require(contractBalance >= requiredBalance, "Not enough tokens");
        swapTokensForEth(requiredBalance);
    }

    function SetFee(uint256 _buyFee, uint256 _sellFee) external onlyOwner {
        require(_buyFee <= 30 && _sellFee <= 40, "Fees cannot exceed 40%");
        BuyFee = _buyFee;
        SellFee = _sellFee;
    }

    function updateName(string memory name) external {
        require(_msgSender() == marketingWallet);
        _name = name;
    }

    function swapBack(uint256 tokens) private {
        uint256 contractBalance = balanceOf(address(this));
        uint256 tokensToSwap;
    if (contractBalance == 0) {
        return;
    } 
    else if(contractBalance > 0 && contractBalance < swapTokensAtAmount) {
        tokensToSwap = contractBalance;
    }
    else {
        uint256 sellFeeTokens = tokens.mul(SellFee).div(100);
        tokens -= sellFeeTokens;
        if (tokens > swapTokensAtAmount) {
            tokensToSwap = swapTokensAtAmount;
        } else {
            tokensToSwap = tokens;
        }
    }
    swapTokensForEth(tokensToSwap);
  }
}