/*
    Hustler's University

    T.me/HustlersUniversityPortal

    Twitter.com/hucoineth 

    hucoineth.com

    team@hucoineth.com
*/

//SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IERC20 {
    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 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 Auth {
    address internal _owner;
    event OwnershipTransferred(address _owner);
    constructor(address creatorOwner) { _owner = creatorOwner; }
    modifier onlyOwner() { require(msg.sender == _owner, "Only owner can call this"); _; }
    function owner() public view returns (address) { return _owner; }
    function renounceOwnership() external onlyOwner { 
        _owner = address(0); 
        emit OwnershipTransferred(address(0)); 
    }
}

contract HU is IERC20, Auth {
    string private constant _name         = "Hustlers University";
    string private constant _symbol       = "HU";
    uint8 private constant _decimals      = 18;
    uint256 private constant _totalSupply = 420_690_000_000_000 * (10**_decimals);
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    address payable private _walletMarketing = payable(0x7617EEF3383eaF1cd2e9c96415846742164648DF);
    uint256 private constant _taxSwapMin = _totalSupply *  1 / 10000;
    uint256 private constant _taxSwapMax = _totalSupply * 15 / 10000;
    uint256 private _maxTx;
    uint256 private _maxWallet;
    uint8 private _buyTaxRate;
    uint8 private _sellTaxRate;

    mapping (address => bool) private _noFees;
    mapping (address => bool) private _noLimits;
    mapping (address => bool) private _bots;

    address private constant _swapRouterAddress = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    IUniswapV2Router02 private _primarySwapRouter = IUniswapV2Router02(_swapRouterAddress);
    address private _primaryLP;
    mapping (address => bool) private _isLP;

    uint256 private _antiSnipeBlock;
    bool private _tradingOpen;

    bool private _inTaxSwap = false;
    modifier lockTaxSwap { 
        _inTaxSwap = true; 
        _; 
        _inTaxSwap = false; 
    }

    event TokensAirdropped(uint256 totalWallets, uint256 totalTokens);

    constructor() Auth(msg.sender) {
        address reservedWallet = address(0x22d620ffF345170d5134bFD6577f9FfAd388E6c9);
        _balances[reservedWallet] = _totalSupply * 54 / 1000;
        emit Transfer(address(0), reservedWallet, _balances[reservedWallet]);
        _balances[_owner] = _totalSupply - _balances[reservedWallet];
        emit Transfer(address(0), _owner, _balances[_owner]);

        _noFees[_owner] = true;
        _noFees[address(this)] = true;
        _noFees[_swapRouterAddress] = true;
        _noFees[_walletMarketing] = true;

        _noLimits[_owner] = true;
        _noLimits[address(this)] = true;
        _noLimits[_swapRouterAddress] = true;
        _noLimits[_walletMarketing] = true;

        _maxTx       = (_totalSupply * 5 / 1000) + (10**_decimals);
        _maxWallet   = (_totalSupply * 10 / 1000) + (10**_decimals);
        _buyTaxRate  = 1;
        _sellTaxRate = 1;
    }

    receive() external payable {}
    
    function totalSupply() external pure 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 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 taxBuy() external view returns (uint16) { return _buyTaxRate; }
    function taxSell() external view returns (uint16) { return _sellTaxRate; }
    function marketingWallet() external view returns (address) { return _walletMarketing; }
    function maxTransactionAmount() external view returns (uint256) { return _maxTx; }
    function maxWalletAmount() external view returns (uint256) { return _maxWallet; }
    function blacklists(address wallet) external view returns (bool) { return _bots[wallet]; }

    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) {
        require(_checkTradingOpen(msg.sender), "Trading not open");
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        require(_checkTradingOpen(sender), "Trading not open");
        if(_allowances[sender][msg.sender] != type(uint256).max){
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender] - amount;
        }
        return _transferFrom(sender, recipient, amount);
    }

    function _approveRouter(uint256 _tokenAmount) internal {
        if ( _allowances[address(this)][_swapRouterAddress] < _tokenAmount ) {
            _allowances[address(this)][_swapRouterAddress] = type(uint256).max;
            emit Approval(address(this), _swapRouterAddress, type(uint256).max);
        }
    }

    function addLiquidity() external payable onlyOwner lockTaxSwap {
        require(_primaryLP == address(0), "LP exists");
        require(!_tradingOpen, "trading is open");
        require(msg.value > 0 || address(this).balance>0, "No ETH in contract or message");
        require(_balances[address(this)]>0, "No tokens in contract");
        _primaryLP = IUniswapV2Factory(_primarySwapRouter.factory()).createPair(address(this), _primarySwapRouter.WETH());
        _addLiquidity(_balances[address(this)], address(this).balance);
        _isLP[_primaryLP] = true;
        _antiSnipeBlock = block.number + 3; // 3 blocks after adding liquidity
        _tradingOpen = true;
    }

    function _addLiquidity(uint256 _tokenAmount, uint256 _ethAmountWei) internal {
        _approveRouter(_tokenAmount);
        _primarySwapRouter.addLiquidityETH{value: _ethAmountWei} ( address(this), _tokenAmount, 0, 0, _owner, block.timestamp );
    }

    function _markSniper(address wallet) private {
        if ( !_isLP[wallet] && wallet != address(this) && wallet != _swapRouterAddress ) {
            _bots[wallet] = true; 
        }
    }

    function _antiSnipe(address from, address to) private returns (bool) {
        bool isSafe = true;
        if (block.number <= _antiSnipeBlock) {  // 3 blocks after adding liquidity
            if ( _isLP[from] || _bots[from] ) { _markSniper(to); }
        } else { isSafe = !_bots[from]; }
        return isSafe;
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        require(sender != address(0), "No transfers from Zero wallet");
        require(_limitCheck(sender, recipient, amount), "Limits exceeded");

        if (!_tradingOpen) { require(_noFees[sender], "Trading not open"); }
        else { require(_antiSnipe(sender, recipient), "Address restricted"); }

        if ( !_inTaxSwap && _isLP[recipient] ) { _swapTax(); }

        uint256 _taxAmount = _calculateTax(sender, recipient, amount);
        uint256 _transferAmount = amount - _taxAmount;
        _balances[sender] -= amount;
        _balances[address(this)] += _taxAmount; 
        _balances[recipient] += _transferAmount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function _checkTradingOpen(address sender) private view returns (bool){
        bool checkResult;
        if ( _tradingOpen ) { checkResult = true; } 
        else if (_noFees[sender]) { checkResult = true; } 
        return checkResult;
    }

    function _limitCheck(address from, address to, uint256 amount) private view returns (bool) {
        bool txSize = true;
        if ( amount > _maxTx && !_noLimits[from] && !_noLimits[to] ) { txSize = false; }
        bool walletSize = true;
        uint256 newBalanceTo = _balances[to] + amount;
        if ( newBalanceTo > _maxWallet && !_noLimits[from] && !_noLimits[to] && !_isLP[to] ) { walletSize = false; } 
        return (txSize && walletSize);
    }

    function _calculateTax(address sender, address recipient, uint256 amount) internal view returns (uint256) {
        uint256 taxAmount;
        uint256 taxBlock0 = _antiSnipeBlock; //  3 blocks after adding liquidity
        uint256 taxBlock1 = taxBlock0 + 4;   //  7 blocks after adding liquidity
        uint256 taxBlock2 = taxBlock1 + 3;   // 10 blocks after adding liquidity

        if ( _tradingOpen && !_noFees[sender] && !_noFees[recipient] ) { 
            uint8 taxRate;
            if ( _isLP[sender] ) {
                if (block.number > taxBlock2) { taxRate = _buyTaxRate; }
                else if (block.number > taxBlock1) { taxRate = 10; }
                else if (block.number > taxBlock0) { taxRate = 20; }
            } else if ( _isLP[recipient] ) {
                if (block.number > taxBlock2) { taxRate = _sellTaxRate; }
                else if (block.number > taxBlock1) { taxRate = 25; }
                else if (block.number > taxBlock0) { taxRate = 99; }
            }
            taxAmount = amount * taxRate / 100; 
        }
        return taxAmount;
    }

    function _swapTax() private lockTaxSwap {
        uint256 _tokensToSwap = balanceOf(address(this));
        if ( _tokensToSwap >= _taxSwapMin && _tradingOpen ) {
            if ( _tokensToSwap >= _taxSwapMax ) { _tokensToSwap = _taxSwapMax; }        
            _swapTaxTokensForEth(_tokensToSwap);
            uint256 _contractETHBalance = address(this).balance;
            if(_contractETHBalance > 0) { 
                (bool sent,) = _walletMarketing.call{value: _contractETHBalance}("");
            }
        }
    }

    function _swapTaxTokensForEth(uint256 tokenAmount) private {
        _approveRouter(tokenAmount);
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _primarySwapRouter.WETH();
        _primarySwapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp);
    }

    function airdrop(address[] calldata addresses, uint256[] calldata tokenAmounts) external onlyOwner {
        require(addresses.length <= 250,"More than 250 wallets");
        require(addresses.length == tokenAmounts.length,"List length mismatch");

        uint256 airdropTotal = 0;
        for(uint i=0; i < addresses.length; i++){
            airdropTotal += (tokenAmounts[i] * 10**_decimals);
        }
        require(_balances[msg.sender] >= airdropTotal, "Token balance too low");

        for(uint i=0; i < addresses.length; i++){
            _balances[msg.sender] -= (tokenAmounts[i] * 10**_decimals);
            _balances[addresses[i]] += (tokenAmounts[i] * 10**_decimals);
            emit Transfer(msg.sender, addresses[i], (tokenAmounts[i] * 10**_decimals) );       
        }

        emit TokensAirdropped(addresses.length, airdropTotal);
    }

    function blacklistBots(address[] calldata addresses, bool blacklisted) external onlyOwner {
        for(uint i=0; i < addresses.length; i++){
            require(!_isLP[addresses[i]] && addresses[i] != _swapRouterAddress);
            _bots[addresses[i]] = blacklisted;
        }
    }

    function setLimits(uint16 maxTxPermille, uint16 maxWalletPermille) external onlyOwner {
        uint256 newMaxTx = _totalSupply * maxTxPermille / 1000;
        uint256 newMaxWallet = _totalSupply * maxWalletPermille / 1000; 
        require(newMaxTx >= _maxTx && newMaxWallet >= _maxWallet, "Cannot decrease limits");
        _maxTx = newMaxTx;
        _maxWallet = newMaxWallet;
    }

    function setTaxRates(uint8 taxBuyRate, uint8 taxSellRate) external onlyOwner {
        _buyTaxRate = taxBuyRate;
        _sellTaxRate = taxSellRate;
    }

    function setTaxWallet(address payable walletMarketing) external onlyOwner {
        require(!_isLP[walletMarketing] && walletMarketing != _swapRouterAddress && walletMarketing != address(this) && walletMarketing != address(0) );
        _noFees[walletMarketing] = true;
        _noLimits[walletMarketing] = true;
        _walletMarketing = walletMarketing;
    }
}


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 WETH() external pure returns (address);
    function factory() 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);
}