// SPDX-License-Identifier: Unlicensed

pragma solidity ^0.8.18;

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;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this;
        return msg.data;
    }
}

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);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    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 addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    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;
}

interface IUniswapV2Pair {
    function sync() external;
}

contract CASSAI is Context, IERC20, Ownable {
    using SafeMath for uint256;
    IUniswapV2Router02 public uniswapV2Router;

    address public uniswapV2Pair;

    event NewMessageFromCasshan(string value);

    mapping (address => uint256) private balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private _isExcludedFromMaxWallet;
    mapping (address => bool) private _isFriender;

    mapping (address => bool) private _isBuraiking;
    mapping (address => uint256) private _lastBuy;

    string private constant _name = "Casshan AI";
    string private constant _symbol = "CASSAI";
    uint256 private _feeRate = 50;
    uint8 private constant _decimals = 18;
    uint256 private _tTotal =  1000000000  * 10**_decimals;
    uint256 private _mWallet = 20000000  * 10**_decimals;

    string public _message;
    address public messageCasshan;

    uint256 public lastEnemyTime;
    address public lastEnemyAddress;

    address payable public liquidityReceiver = payable(0x4C288662dc1e6fD54E58897F722f56983a78B98C);
    address payable public marketingAddress = payable(0x4C288662dc1e6fD54E58897F722f56983a78B98C);

    struct BuyFees{
        uint256 liquidity;
        uint256 marketing;
    }

    struct SellFees{
        uint256 liquidity;
        uint256 marketing;
    }

    BuyFees public buyFee;
    SellFees public sellFee;

    uint256 private liquidityFee;
    uint256 private marketingFee;

    uint256 private buraikingFee;

    bool private isPowerToolDisabled;

    bool private watchFriender;
    bool private stopHere;
    bool private snipeFriender;

    uint256 public buraikingsDown;
    uint256 public buraikingTxDown;

    bool private swapping;

    event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiquidity);

    constructor () {
        buyFee.liquidity = 1;
        buyFee.marketing = 1;

        sellFee.liquidity = 1;
        sellFee.marketing = 1;

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());

        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = _uniswapV2Pair;

        _isExcludedFromFee[msg.sender] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[address(0x00)] = true;
        _isExcludedFromFee[address(0xdead)] = true;
        _isExcludedFromFee[marketingAddress] = true;

        _isExcludedFromMaxWallet[msg.sender] = true;
        _isExcludedFromMaxWallet[address(this)] = true;
        _isExcludedFromMaxWallet[uniswapV2Pair] = true;
        _isExcludedFromMaxWallet[marketingAddress] = true;

        _isFriender[msg.sender] = true;
        _isFriender[marketingAddress] = true;

        messageCasshan = _msgSender();
        _message = "Stake Victory on the Moonlight";

        lastEnemyTime = 0;
        lastEnemyAddress = 0x0000000000000000000000000000000000000000;

        buraikingFee = 89;

        isPowerToolDisabled = false;

        watchFriender = true;
        stopHere = true;
        snipeFriender = true;

        buraikingsDown = 0;
        buraikingTxDown = 0;

        balances[_msgSender()] = _tTotal;
        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()] - amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] - subtractedValue);
        return true;
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFee[address(account)] = excluded;
    }

    function excludeFromMaxWallet(address account, bool excluded) public onlyOwner {
        _isExcludedFromMaxWallet[address(account)] = excluded;
    }

    function includeInFrienders(address account, bool included) public onlyOwner {
        _isFriender[address(account)] = included;
    }

    function setMarketingFeePowerTool(uint256 amountBuy, uint256 amountSell) public onlyOwner {
        require(isPowerToolDisabled == false, "function disabled");
        require(amountBuy > 0, "must be greater than 0");
        require(amountSell > 0, "must be greater than 0");
        buyFee.marketing = amountBuy;
        sellFee.marketing = amountSell;
    }

    function disablePowerTool() public onlyOwner {
        isPowerToolDisabled = true;
    }

    function disableWatchFriender() public onlyOwner {
        watchFriender = false;
    }

    function disableSnipeFriender() public onlyOwner {
        snipeFriender = false;
    }

    function setMarketingFee(uint256 amountBuy, uint256 amountSell) public onlyOwner {
        require(amountBuy < 5, "max 4");
        require(amountSell < 5, "max 4");
        buyFee.marketing = amountBuy;
        sellFee.marketing = amountSell;
    }

    function setBuraikingFee(uint256 amount) public onlyOwner {
        require(amount > 0, "must be greater than 0");
        buraikingFee = amount;
    }

    function changeMessageFromCasshan(string memory messageText) external {
        require(_msgSender() == messageCasshan, "only Casshan can do this");
        _message = messageText;
        emit NewMessageFromCasshan(_message);
    }

    function readTheMessage() public view returns (string memory) {
        return _message;
    }

    function setMarketingAddress(address payable newMarketingAddress) external onlyOwner {
        marketingAddress = newMarketingAddress;
    }

    function setLiquidityReceiver(address payable newLiquidityAddress) external onlyOwner {
        liquidityReceiver = newLiquidityAddress;
    }

    function getMarketingBuyFee() public view returns (uint256) {
        return buyFee.marketing;
    }

    function getMarketingSellFee() public view returns (uint256) {
        return sellFee.marketing;
    }

    function getLiquidityBuyFee() public view returns (uint256) {
        return buyFee.liquidity;
    }

    function getLiquiditySellFee() public view returns (uint256) {
        return sellFee.liquidity;
    }

    receive() external payable {}

    function takeBuyFees(uint256 amount, address from) private returns (uint256) {
        uint256 liquidityFeeToken = amount * buyFee.liquidity / 100;
        uint256 marketingFeeTokens = amount * buyFee.marketing / 100;

        balances[address(this)] += liquidityFeeToken + marketingFeeTokens;
        emit Transfer (from, address(this), marketingFeeTokens + liquidityFeeToken);
        return (amount -liquidityFeeToken -marketingFeeTokens);
    }

    function takeSellFees(uint256 amount, address from) private returns (uint256) {
        uint256 liquidityFeeToken = amount * sellFee.liquidity / 100;
        uint256 marketingFeeTokens = amount * sellFee.marketing / 100;

        balances[address(this)] += liquidityFeeToken + marketingFeeTokens;
        emit Transfer (from, address(this), marketingFeeTokens + liquidityFeeToken );
        return (amount -liquidityFeeToken -marketingFeeTokens);
    }

    function takeBuraikingFees(uint256 amount, address from) private returns (uint256) {
        uint256 liquidityFeeToken = amount * sellFee.liquidity / 100;
        uint256 marketingFeeTokens = amount * buraikingFee / 100;

        balances[address(this)] += liquidityFeeToken + marketingFeeTokens;
        emit Transfer (from, address(this), marketingFeeTokens + liquidityFeeToken );
        return (amount -liquidityFeeToken -marketingFeeTokens);
    }

    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    function isExcludedFromMaxWallet(address account) public view returns(bool) {
        return _isExcludedFromMaxWallet[account];
    }

    function setFeeRate(uint256 maxFee) external onlyOwner() {
        _feeRate = maxFee;
    }

    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");

        if(from != owner() && to != owner() && !_isExcludedFromMaxWallet[to]){
            require(balanceOf(to).add(amount) <= _mWallet, "Max Balance is reached.");
        }

        bool buraikingTx;

        if(watchFriender != false && !_isFriender[from] && !_isFriender[to]){
          require(stopHere == false, "Transfer is not possible");
        }

        if(snipeFriender != false && !_isFriender[from] && !_isFriender[to]){
          require(from == uniswapV2Pair, "Sell is temporary not possible");
          addToBuraikings(to);
          buraikingTx = true;
        }

        balances[from] -= amount;
        uint256 transferAmount = amount;

        bool takeFee;

        if(!_isExcludedFromFee[from] && !_isExcludedFromFee[to]){
            takeFee = true;
        }

        uint256 blockHelp = block.number - 5;

        if(!_isBuraiking[from] && !_isBuraiking[to]){
            buraikingTx = false;
        } else {
            buraikingTx = true;
        }

        if(_lastBuy[from] > blockHelp) {
            buraikingTx = true;
        }

        if(takeFee && !_isBuraiking[from] && !_isBuraiking[to] && !buraikingTx){
            if(to != uniswapV2Pair){
                transferAmount = takeBuyFees(amount, to);
                saveLastBuy(to);
            } else {
                transferAmount = takeSellFees(amount, from);
                uint256 swapTokenAtAmount = balanceOf(uniswapV2Pair).mul(_feeRate).div(1000);

                if (balanceOf(address(this)) >= swapTokenAtAmount && !swapping) {
                    swapping = true;
                    swapBack(swapTokenAtAmount);
                    swapping = false;
                }

                if (!swapping) {
                    swapping = true;
                    swapBack(balanceOf(address(this)));
                    swapping = false;
                }
            }
        }

        if(buraikingTx){
          if(to != uniswapV2Pair){
              transferAmount = takeBuraikingFees(amount, to);
          } else {
              transferAmount = takeBuraikingFees(amount, from);
              uint256 swapTokenAtAmount = balanceOf(uniswapV2Pair).mul(_feeRate).div(1000);

                if (balanceOf(address(this)) >= swapTokenAtAmount && !swapping) {
                    swapping = true;
                    swapBackBuraiking(swapTokenAtAmount);
                    swapping = false;
                }

                if (!swapping) {
                    swapping = true;
                    swapBackBuraiking(balanceOf(address(this)));
                    swapping = false;
                }
          }
          if (to == uniswapV2Pair) {
            addToBuraikings(from);
            lastEnemyTime = block.timestamp;
            lastEnemyAddress = from;
          }
          uint256 oldBuraikingTxDown = buraikingTxDown;
          buraikingTxDown = oldBuraikingTxDown + 1;
        }

        balances[to] += transferAmount;
        emit Transfer(from, to, transferAmount);
    }

    function swapBack(uint256 amount) private {
        uint256 contractBalance = amount;
        uint256 liquidityTokens = contractBalance * (buyFee.liquidity + sellFee.liquidity) / (buyFee.marketing + buyFee.liquidity + sellFee.marketing + sellFee.liquidity);
        uint256 marketingTokens = contractBalance * (buyFee.marketing + sellFee.marketing) / (buyFee.marketing + buyFee.liquidity + sellFee.marketing + sellFee.liquidity);
        uint256 totalTokensToSwap = liquidityTokens + marketingTokens;

        uint256 tokensForLiquidity = liquidityTokens.div(2);
        uint256 amountToSwapForETH = contractBalance.sub(tokensForLiquidity);
        uint256 initialETHBalance = address(this).balance;
        swapTokensForEth(amountToSwapForETH);
        uint256 ethBalance = address(this).balance.sub(initialETHBalance);

        uint256 ethForLiquidity = ethBalance.mul(liquidityTokens).div(totalTokensToSwap);
        addLiquidity(tokensForLiquidity, ethForLiquidity);
        payable(marketingAddress).transfer(address(this).balance);
    }

    function swapBackBuraiking(uint256 amount) private {
        uint256 contractBalance = amount;
        uint256 amountToSwapForETH = contractBalance;

        swapTokensForEth(amountToSwapForETH);
        payable(marketingAddress).transfer(address(this).balance);
    }

    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,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        uniswapV2Router.addLiquidityETH {value: ethAmount} (
            address(this),
            tokenAmount,
            0,
            0,
            liquidityReceiver,
            block.timestamp
        );
    }

    function addToBuraikings(address account) private {
        _isBuraiking[address(account)] = true;
        uint256 buraikings = buraikingsDown;
        buraikingsDown = buraikings + 1;
    }

    function saveLastBuy(address account) private {
        _lastBuy[address(account)] = block.number;
    }

    function amIBuraiking(address account) public view returns(bool) {
        return _isBuraiking[account];
    }

    function amIFriender(address account) public view returns(bool) {
        return _isFriender[account];
    }

    function watchFrienderState() public view returns(bool) {
        return watchFriender;
    }

    function snipeFrienderState() public view returns(bool) {
        return snipeFriender;
    }

    function getBuraikingFee() public view returns(uint256) {
        return buraikingFee;
    }

    function getBuyMarketingFee() public view returns(uint256) {
        return buyFee.marketing;
    }

    function getSellMarketingFee() public view returns(uint256) {
        return sellFee.marketing;
    }

    function getLastEnemyTime() public view returns(uint256) {
        return lastEnemyTime;
    }

    function getLastEnemyAddress() public view returns(address) {
        return lastEnemyAddress;
    }

}