ORACLYX (ORLX)

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

/**
 * ORACLYX (ORLX) — contrato simples, sem admin, sem mint extra
 * - Supply fixo: 500,000,000 ORLX
 * - Decimais: 8 (premium)
 * - Todo o supply é emitido para msg.sender (a conta que faz o deploy)
 */

contract ORLXTokenFinal {
    // Metadados
    string public constant name = "ORACLYX";
    string public constant symbol = "ORLX";
    uint8  public constant decimals = 8;

    // Estado ERC20
    uint256 public immutable totalSupply; // fixo
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    // Eventos ERC20
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor() {
        // 500,000,000 * 10^8
        uint256 _total = 500_000_000 * (10 ** uint256(decimals));
        totalSupply = _total;
        balanceOf[msg.sender] = _total;
        emit Transfer(address(0), msg.sender, _total);
    }

    // Funções ERC20 básicas
    function transfer(address to, uint256 value) external returns (bool) {
        require(balanceOf[msg.sender] >= value, "balance too low");
        unchecked {
            balanceOf[msg.sender] -= value;
            balanceOf[to] += value;
        }
        emit Transfer(msg.sender, to, value);
        return true;
    }

    function approve(address spender, uint256 value) external returns (bool) {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) external returns (bool) {
        require(balanceOf[from] >= value, "balance too low");
        uint256 allowed = allowance[from][msg.sender];
        require(allowed >= value, "allowance too low");
        unchecked {
            allowance[from][msg.sender] = allowed - value;
            balanceOf[from] -= value;
            balanceOf[to] += value;
        }
        emit Transfer(from, to, value);
        return true;
    }
}