// https://twitter.com/WatcherGuru/status/1729993150846971935

// SPDX-License-Identifier: MIT

pragma solidity 0.8.20;

interface ERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function getOwner() external view returns (address);
    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);
}


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 public _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        authorizations[_owner] = true;
        emit OwnershipTransferred(address(0), msgSender);
    }
    mapping (address => bool) internal authorizations;

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Oc");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}

interface IDEXFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        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 swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

interface InterfaceLP {
    function sync() external;
}


library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SMao");

        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SMao");
    }
    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, "SMmo");

        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SMdbz");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

contract FastCashAi is Ownable, ERC20 {
    using SafeMath for uint256;

    address WETH;
    address constant DEAD = 0x000000000000000000000000000000000000dEaD;

    string constant _name = "Fast Cash AI";
    string constant _symbol = "FCA";
    uint8 constant _decimals = 18; 

    event EditTax(uint8 Buy, uint8 Sell);
    event user_exemptfromfees(address Wallet, bool Exempt);
    event user_TxExempt(address Wallet, bool Exempt);
    event ClearStuck(uint256 amount);
    event ClearToken(address TokenAddressCleared, uint256 Amount);
    event set_Receivers(address marketingFeeReceiver);
    event set_MaxWallet(uint256 maxWallet);
    event set_MaxTX(uint256 maxTX);
    event set_SwapBack(uint256 Amount, bool Enabled);
  
    uint256 _totalSupply =  1_000_000_000 * 10**_decimals; 
    uint256 public _lim = _totalSupply.mul(5).div(100);

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _allowances;  
    mapping (address => bool) isexemptfromfees;
    mapping (address => bool) isexemptfrommaxTX;

    uint256 sellpercent = 100;
    uint256 buypercent = 100;

    address private marketingFeeReceiver;

    IDEXRouter public router;
    InterfaceLP private pairContract;
    address public pair;
    
    bool public TradingOpen = false; 
    bool public swapEnabled = true;

    uint256 public swapThreshold = _totalSupply.div(100); 

    bool inSwap;
    modifier swapping() { inSwap = true; _; inSwap = false; }
    
    constructor () {
        router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        WETH = router.WETH();
        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
        pairContract = InterfaceLP(pair);
        
        _allowances[address(this)][address(router)] = type(uint256).max;

        isexemptfromfees[msg.sender] = true;            
        isexemptfrommaxTX[msg.sender] = true;
        isexemptfrommaxTX[pair] = true;
        isexemptfrommaxTX[marketingFeeReceiver] = true;
        isexemptfrommaxTX[address(this)] = true;
        
        marketingFeeReceiver = 0x19C23B86C574780676330958E43810f267468F07;
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);

    }

    receive() external payable { }

    function totalSupply() external view override returns (uint256) { return _totalSupply; }
    function decimals() external pure override returns (uint8) { return _decimals; }
    function symbol() external pure override returns (string memory) { return _symbol; }
    function name() external pure override returns (string memory) { return _name; }
    function getOwner() external view override returns (address) {return owner();}
    function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        if(_allowances[sender][msg.sender] != type(uint256).max){
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "a");
        }

        return _transferFrom(sender, recipient, amount);
    }

    function removeLimits () external onlyOwner {
        _lim = _totalSupply;
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        if(inSwap){ return _basicTransfer(sender, recipient, amount); }

        if(!authorizations[sender] && !authorizations[recipient]){
            require(TradingOpen,"n");
        }
        
               
        if (    !authorizations[sender] &&
                recipient != address(this) &&
                recipient != address(DEAD) &&
                recipient != pair &&
                recipient != marketingFeeReceiver &&
                !isexemptfrommaxTX[recipient]) {
            uint256 heldTokens = balanceOf(recipient);
            require((heldTokens + amount) <= _lim, "n");}

        checkTxLimit(sender, amount);  

        if(shouldSwapBack()){ swapBack(); }
        _balances[sender] = _balances[sender].sub(amount, "b");

        uint256 amountReceived = (isexemptfromfees[sender] || isexemptfromfees[recipient]) ? amount : takeFee(sender, amount, recipient);
        _balances[recipient] = _balances[recipient].add(amountReceived);

        emit Transfer(sender, recipient, amountReceived);
        return true;
    }
 
    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(amount, "b");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function checkTxLimit(address sender, uint256 amount) internal view {
        require(amount <= _lim || isexemptfrommaxTX[sender], "l");
    }

    function shouldTakeFee(address sender) internal view returns (bool) {
        return !isexemptfromfees[sender];
    }

    function takeFee(address sender, uint256 amount, address recipient) internal returns (uint256) {
        uint256 percent = 0;
        if(recipient == pair) {
            percent = sellpercent;
        } else if(sender == pair) {
            percent = buypercent;
        }

        uint256 feeAmount = amount.mul(percent).div(10000);

        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);

        return amount.sub(feeAmount);
    }

    function shouldSwapBack() internal view returns (bool) {
        return msg.sender != pair
        && !inSwap
        && swapEnabled
        && _balances[address(this)] >= swapThreshold;
    }
  
    function manualSend() external { 
        payable(marketingFeeReceiver).transfer(address(this).balance);
    }

    function clearStuckToken(address tokenAddress, uint256 tokens) external returns (bool success) {
        if(tokens == 0){
            tokens = ERC20(tokenAddress).balanceOf(address(this));
        }
        emit ClearToken(tokenAddress, tokens);
        return ERC20(tokenAddress).transfer(marketingFeeReceiver, tokens);
    }

    function setTax(uint256 _percentonbuy, uint256 _percentonsell) external onlyOwner {
        sellpercent = _percentonsell;
        buypercent = _percentonbuy;
        set_fees();
    }
       
    function openTrading() public onlyOwner {
        TradingOpen = true;
        buypercent = 1000;
        sellpercent = 1000;
        set_fees();
    }
             
    function swapBack() internal swapping {
        uint256 amountToSwap = swapThreshold;

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;

        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETHMarketing = address(this).balance.sub(balanceBefore);

        (bool tmpSuccess,) = payable(marketingFeeReceiver).call{value: amountETHMarketing}("");
        
        tmpSuccess = false;
    }
  
    function set_fees() internal {
        emit EditTax(
            uint8(buypercent.div(100)),
            uint8(sellpercent.div(100))
        );
    }
}