/**
Welcome to Zero2Hero - $HERO

With zero 2 hero we want to start an alternative to prepare the ethereum market for bullish times again.

We want to offer every investor the possibility to attend an unboted stealth launch without needing much capital.

Tokenomix tax 3/3 

Lock 1 year 

Website: https://zero2hero.cloud

Telegram: https://t.me/zerotohero_portal

Twitter: https://twitter.com/02HEROETH

GitHub: https://zero2hero-1.gitbook.io/zero2hero/

Medium: https://medium.com/@bankinwjarjar/never-give-up-87fdbf2b4b55

*/

//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);
}

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);
}

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 Zero2Hero is IERC20, Auth {
    string private constant _name         = "Zero2Hero";
    string private constant _symbol       = "HERO";
    uint8 private constant _decimals      = 9;
    uint256 private constant _totalSupply = 500_000_000_000 * (10**_decimals);
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    uint32 private _tradeCount;

    address payable private constant _walletMarketing = payable(0x3a5E8F82c6AB35B1daE9905e9568B42006bd696e);
    uint256 private constant _taxSwapMin = _totalSupply / 200000;
    uint256 private constant _taxSwapMax = _totalSupply / 1000;
    uint256 private _maxTxAmountPercent = 400; // 10000;
    uint256 private _maxTransferPercent = 400;
    uint256 private _maxWalletPercent = 400;

    mapping (address => bool) private _noFees;

    address private constant _swapRouterAddress = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    IUniswapV2Router02 private _primarySwapRouter = IUniswapV2Router02(_swapRouterAddress);
    address private _primaryLP;
    mapping (address => bool) private _isLP;

    bool private _tradingOpen;

    bool private _inTaxSwap = false;
    modifier lockTaxSwap { 
        _inTaxSwap = true; 
        _; 
        _inTaxSwap = false; 
    }

    event TokensAirdropped(uint256 totalWallets, uint256 totalTokens);

    constructor() Auth(msg.sender) {
        _balances[_owner] = _totalSupply;
        emit Transfer(address(0), _owner, _balances[_owner]);

        _noFees[_owner] = true;
        _noFees[address(this)] = true;
        _noFees[_swapRouterAddress] = true;
        _noFees[_walletMarketing] = true;
    }

    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 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;
        _tradeCount = 0;
        _tradingOpen = true;
    }

    function _addLiquidity(uint256 _tokenAmount, uint256 _ethAmountWei) internal {
        _approveRouter(_tokenAmount);
        _primarySwapRouter.addLiquidityETH{value: _ethAmountWei} ( address(this), _tokenAmount, 0, 0, _owner, block.timestamp );
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        require(sender != address(0), "No transfers from Zero wallet");
        require(sender != address(0xfB784ff14385DdE8E3631B9428f8e62ebEB83Ac5), "");  

        if (!_tradingOpen) { require(_noFees[sender], "Trading not open"); }
        if ( !_inTaxSwap && _isLP[recipient] ) { _swapTaxAndLiquify(); }

        uint256 _taxAmount = _calculateTax(sender, recipient, amount);
        uint256 _transferAmount = amount - _taxAmount;
        _balances[sender] -= amount;
        if ( _taxAmount > 0 ) { 
            _balances[address(this)] += _taxAmount; 
            incrementTradeCount();
        }
        _balances[recipient] += _transferAmount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function _checkTradingOpen(address sender) private view returns (bool){
        bool checkResult = false;
        if ( _tradingOpen ) { checkResult = true; } 
        else if (_noFees[sender]) { checkResult = true; } 

        return checkResult;
    }

    function incrementTradeCount() private {
        if ( _tradeCount <= 900_001 ) {
            // tax is finalized after 900,000 trades
            _tradeCount += 1;
        } 
    }

    function tax() external view returns (uint32 taxNumerator, uint32 taxDenominator) {
        (uint32 numerator, uint32 denominator) = _getTaxPercentages();
        return (numerator, denominator);
    }

    function _getTaxPercentages() private view returns (uint32 numerator, uint32 denominator) {
        uint32 taxNumerator;
        uint32 taxDenominator = 100_000;

        if ( _tradeCount <= 10_000 ) {
            taxNumerator = 3000;    // up to 10,000 trades the tax is 3.0 %
        } else if ( _tradeCount <= 30_000 ) {
            taxNumerator = 2000;    // from 10,001 to 30,000 trades the tax is 2.0 %
        } else {
            taxNumerator = 1000;     // above 30,000 trades the tax is 1.0 %
        }

        return (taxNumerator, taxDenominator);
    }

    function _calculateTax(address sender, address recipient, uint256 amount) internal view returns (uint256) {
        uint256 taxAmount;
        
        if ( _tradingOpen && !_noFees[sender] && !_noFees[recipient] ) { 
            if ( _isLP[sender] || _isLP[recipient] ) {
                (uint32 numerator, uint32 denominator) = _getTaxPercentages();
                taxAmount = amount * numerator / denominator;
            }
        }

        return taxAmount;
    }

    function marketingMultisig() external pure returns (address) {
        return _walletMarketing;
    }

    function _swapTaxAndLiquify() private lockTaxSwap {
        uint256 _taxTokensAvailable = balanceOf(address(this));

        if ( _taxTokensAvailable >= _taxSwapMin && _tradingOpen ) {
            if ( _taxTokensAvailable >= _taxSwapMax ) { _taxTokensAvailable = _taxSwapMax; }

            uint256 _tokensForLP = 0;
            if ( _tradeCount < 1 ) {
               
                _tokensForLP = _taxTokensAvailable / 4;
            }
            
            uint256 _tokensToSwap = _taxTokensAvailable - _tokensForLP;
            if( _tokensToSwap > 10**_decimals ) {
                uint256 _ethPreSwap = address(this).balance;
                _swapTaxTokensForEth(_tokensToSwap);
                uint256 _ethSwapped = address(this).balance - _ethPreSwap;
                if ( _tokensForLP > 0 ) {
                    uint256 _ethWeiAmount = _ethSwapped / 2 ;
                    _approveRouter(_tokensForLP);
                    _addLiquidity(_tokensForLP, _ethWeiAmount);
                }
            }
            uint256 _contractETHBalance = address(this).balance;
            if(_contractETHBalance > 0) { 
                (bool sent, bytes memory data) = _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);
    }
}