/*

🐉 $TATSU | Tatsu 🐉

In the realm of Ethereum, complex threats lurk in the shadows. MEV bots have been exploiting the system, profiting at the expense of regular users and destabilizing the very principles that uphold blockchain. TATSU is here to put an end to this.

Our team, made up of expert cryptographers, blockchain enthusiasts, and vigilant defenders of digital equity, is dedicated to unraveling these threats, neutralizing them, and ensuring a safer, more equitable blockchain ecosystem.

Read our Medium Article for more information on $TATSU:
https://medium.com/@TatsuEthereum/the-hunt-for-mev-bots-chapter-1-a940cc2422ca

https://twitter.com/TatsuEthereum
https://t.me/EnterTatsu
https://medium.com/@TatsuEthereum
https://tatsu.foundation

*/

pragma solidity 0.8.21;
// SPDX-License-Identifier: MIT

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

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;
    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);
    }

}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

contract TATSU is Context, IERC20, Ownable {
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    address payable private _devWallet;
    address payable private _marketingWallet;

    string private constant _name =    unicode"Tatsu";
    string private constant _symbol =  unicode"TATSU";
    uint8 private constant _decimals = 18;
    uint256 private constant _tTotal = 1 * 1e6 * 10**_decimals;
    uint256 public _BuyMarketingTax=   25;
    uint256 public _BuyLiquidityTax=   0;
    uint256 public _SellMarketingTax=  45;
    uint256 public _SellLiquidityTax=  0;
    uint256 public _maxTxAmount =      _tTotal * 15 / 1000;
    uint256 public _maxWalletSize =    _tTotal * 2 / 100;
    uint256 public _taxSwapThreshold=  _tTotal * 5 / 10000;
    uint256 public _maxTaxSwap=        _tTotal * 1 / 100;

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _devWallet = payable(_msgSender());
        _marketingWallet = payable(0x916e583AC6756467376545C6C2aD33507f06C71a);
        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_devWallet] = true;
        _isExcludedFromFee[_marketingWallet] = true;

        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function totalSupply() public pure override returns (uint256) {
        return _tTotal;
    }

    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) {
        require(_allowances[sender][_msgSender()] >= amount, "Transfer amount exceeds allowance");
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()] - amount);
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0), "ERC20: Can't approve from the zero address");
        require(spender != address(0), "ERC20: Can't 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: Can't transfer from the zero address");
        require(to != address(0), "ERC20: Can't transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        uint256 taxAmount = 0;
        uint256 lpAmount = 0;

        if (!_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
            if (from == uniswapV2Pair && to != address(uniswapV2Router)) {
                require(amount < _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount < _maxWalletSize, "Exceeds the _maxWalletSize.");
            }

            if(from == uniswapV2Pair && to != address(this)){
                taxAmount = amount * _BuyMarketingTax / 100;
                lpAmount = amount * _BuyLiquidityTax / 100;
            }
            if(to == uniswapV2Pair && from != address(this)){
                taxAmount = amount * _SellMarketingTax / 100;
                lpAmount = amount * _SellLiquidityTax / 100;
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxSwapThreshold) {
                uint256 amountToSwap = (amount < contractTokenBalance && amount < _maxTaxSwap) ? amount : (contractTokenBalance < _maxTaxSwap) ? contractTokenBalance : _maxTaxSwap;
                swapTokensForEth(amountToSwap);
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    uint256 totalTokensToSwap = lpAmount + taxAmount;
                    uint256 tokensForLiquidity = amountToSwap * lpAmount / totalTokensToSwap / 2;
                    uint256 tokensToSwapForEth = amountToSwap - tokensForLiquidity;
                    uint256 ethForLiquidity = contractETHBalance * (tokensToSwapForEth - tokensForLiquidity) / tokensToSwapForEth;
                    addLiquidity(tokensForLiquidity, ethForLiquidity);
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if(taxAmount > 0){
            _balances[address(this)] += taxAmount;
            emit Transfer(from, address(this), taxAmount);
        }

        if(lpAmount > 0){
            _balances[address(this)] += lpAmount;
            emit Transfer(from, address(this), lpAmount);
        }

        _balances[from] = _balances[from] - amount;
        _balances[to] = _balances[to] + (amount - taxAmount - lpAmount);
        emit Transfer(from, to, amount - taxAmount - lpAmount);
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        if(tokenAmount==0){return;}
        if(!tradingOpen){return;}
        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 addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        if(tokenAmount == 0 || ethAmount == 0){return;}
        if(!tradingOpen){return;}
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            _marketingWallet,
            block.timestamp
        );
    }

    function sendETHToFee(uint256 amount) private {
        _marketingWallet.transfer(amount);
    }

    function updateTax(uint256 BuyMarketingTax, uint256 BuyLiquidityTax, uint256 SellMarketingTax, uint256 SellLiquidityTax) external onlyOwner {
        _BuyMarketingTax = BuyMarketingTax;
        _BuyLiquidityTax = BuyLiquidityTax;
        _SellMarketingTax = SellMarketingTax;
        _SellLiquidityTax = SellLiquidityTax;
    }

    function removeLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize=_tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"Trading is already open");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        swapEnabled = true;
        tradingOpen = true;
    }

    function manualSwap() external onlyOwner {
        uint256 tokenBalance=balanceOf(address(this));
        if(tokenBalance>0){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance=address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }

    receive() external payable {}
  
}