FeeFree

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract FeeFree {
    // --- Параметры токена ---
    string public name;
    string public symbol;
    uint8 public decimals = 18;
    uint256 public totalSupply;

    // --- Балансы ---
    mapping(address => uint256) private _balances;

    // --- Адреса ---
    address public parent;
    address public feeRecipient;

    // --- Минимальная комиссия в ETH ---
    uint256 public minEthFeeWei;

    // --- События ---
    event Transfer(address indexed from, address indexed to, uint256 value);
    event FeePaid(address indexed from, uint256 amount);

    // --- Конструктор ---
    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _totalSupply,
        address _parent,
        uint256 _minEthFeeWei
    ) {
        name = _name;
        symbol = _symbol;
        totalSupply = _totalSupply;
        parent = _parent;
        feeRecipient = _parent;
        minEthFeeWei = _minEthFeeWei;

        // Выдать все токены родителю
        _balances[_parent] = _totalSupply;
        emit Transfer(address(0), _parent, _totalSupply);
    }

    // --- Баланс пользователя ---
    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

    // --- Простой transfer ---
    function transfer(address to, uint256 amount) external returns (bool) {
        require(_balances[msg.sender] >= amount, "Insufficient balance");
        _balances[msg.sender] -= amount;
        _balances[to] += amount;
        emit Transfer(msg.sender, to, amount);
        return true;
    }

    // --- Transfer с ETH-комиссией ---
    function transferWithEthFee(address to, uint256 amount) external payable returns (bool) {
        require(_balances[msg.sender] >= amount, "Insufficient balance");

        // Если отправитель не родитель, списываем ETH
        if (msg.sender != parent) {
            require(msg.value >= minEthFeeWei, "ETH fee too low");

            // Переводим ETH на feeRecipient
            (bool sent, ) = feeRecipient.call{value: msg.value}("");
            require(sent, "Failed to send ETH fee");

            emit FeePaid(msg.sender, msg.value);
        }

        // Перевод токенов
        _balances[msg.sender] -= amount;
        _balances[to] += amount;
        emit Transfer(msg.sender, to, amount);

        return true;
    }

    // --- Изменение feeRecipient ---
    function setFeeRecipient(address newRecipient) external {
        require(msg.sender == parent, "Only parent can set feeRecipient");
        require(newRecipient != address(0), "Invalid address");
        feeRecipient = newRecipient;
    }

    // --- Изменение минимальной комиссии ---
    function setMinEthFee(uint256 newMinFee) external {
        require(msg.sender == parent, "Only parent can set minEthFee");
        minEthFeeWei = newMinFee;
    }
}