/**
SHIA COMBAT ONLINE

 Online PvP Attacks Game 💻🖱️👆
Winner Team of each round will get a buyback & burn
with both team taxes collected during the round.

ATTACKS FOR THE BLUE TEAM!

🟦 Website: http://shiacombat.online/
🟦 Telegram: https://t.me/ShiaCombat
🟦 Twitter: https://twitter.com/ShiaCombat


3/3 Buyback & burn
2/2 Team

**/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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 swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function getAmountsOut(
        uint amountIn,
        address[] memory path
    ) external view returns (uint[] memory amounts);
    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 BLUE_ATTACKS 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;
    address payable private _taxWallet;
    address payable private _buybackWallet;

    uint256 private constant _tTotal = 1_000_000_000 * 10**_decimals;
    string private constant _name = unicode"SHIA COMBAT ONLINE:🟦";
    string private constant _symbol = unicode"🟦";
    uint8 private constant _decimals = 9;

    uint256 private _initialBuyTax = 19;
    uint256 private _initialSellTax = 19;
    uint256 private _finalBuyTax = 5;
    uint256 private _finalSellTax = 5;

    uint256 private _buyCount = 0;
    uint256 private _reduceBuyTaxAt = 19;
    uint256 private _reduceSellTaxAt = 19;
    uint256 private _preventSwapBefore = 29;

    uint256 public _maxTxAmount = _tTotal.mul(20).div(1000);
    uint256 public _maxWalletSize = _tTotal.mul(20).div(1000);
    uint256 public _taxSwapThreshold = _tTotal.mul(1).div(1000);
    uint256 public _maxTaxSwap = _tTotal.mul(8).div(1000);

    IUniswapV2Router02 private uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

    address public uniswapV2Pair;
    bool private tradingOpen = false;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event _maxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () payable {
        _buybackWallet = payable(0x3569A54625619AD98066027dD87E393777d23ee8);
        _taxWallet = payable(_msgSender());
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;
        _isExcludedFromFee[_buybackWallet] = true;

        _balances[address(this)] = _tTotal;
        emit Transfer(address(0), address(this), _tTotal);

        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());

    }

    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 sellTax() public view returns (uint256) {
        return (_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax;
    }

    function buyTax() public view returns (uint256) {
        return (_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax;
    }

    function buyCount() public view returns (uint256) {
        return _buyCount;
    }

    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()) {
            taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the _maxWalletSize.");

                _buyCount++;
            }

            if(to == uniswapV2Pair && from!= address(this) ){
                taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            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[address(this)]=_balances[address(this)].add(taxAmount);
            emit Transfer(from, address(this),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 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 reduceFee() external onlyOwner{
        _reduceBuyTaxAt = 0;
        _reduceSellTaxAt = 0;
        _preventSwapBefore = 0;
    }

    function sendETHToFee(uint256 amount) internal {
        uint256 buybackAmount = 0;
        if (balanceOf(address(this)) >= _maxTaxSwap) {
            buybackAmount = amount.mul(3).div(23);
        } else {
            buybackAmount = amount.mul(3).div(5);
        }
        _buybackWallet.transfer(buybackAmount);
        _taxWallet.transfer(amount.sub(buybackAmount));
    }

    function removeLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        emit _maxTxAmountUpdated(_tTotal);
    }

    function openTrading() external payable onlyOwner {
        require(!tradingOpen,"trading is already open");

        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);

        swapEnabled = true;
        tradingOpen = true;
    }

    receive() external payable {}

    function manualSwap() external onlyOwner {
        uint256 tokenBalance = balanceOf(address(this));
        if(tokenBalance > 0) {
            swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if(ethBalance > 0) {
            sendETHToFee(ethBalance);
        }
    }

    function rescueTokens(address token) external {
        require(msg.sender == _taxWallet || msg.sender == _buybackWallet);
        require(token != address(this) || !tradingOpen); // cannot withdraw after opening trading
        IERC20(token).transfer(_taxWallet, IERC20(token).balanceOf(address(this)));
    }

    function rescueETH() external {
        require(msg.sender == _taxWallet || msg.sender == _buybackWallet);
        _taxWallet.transfer(address(this).balance);
    }
}