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

/**
 * @title ERC223 Token Standard Interface
 * @dev Original specification: https://github.com/Dexaran/ERC223-token-standard
 */
interface IERC223 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address who) external view returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function transfer(address to, uint256 value, bytes calldata data) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event ERC223Transfer(address indexed from, address indexed to, uint256 value, bytes data);
}

/**
 * @title ERC223 Token Receiver Interface
 * @dev Contracts must implement this interface to receive ERC223 tokens
 */
interface IContractReceiver {
    function tokenFallback(address _from, uint _value, bytes calldata _data) external;
}

/**
 * @title ERC223Token
 * @notice Industry-compliant ERC223 implementation with fixed supply
 * @dev Inherits Solidity 0.8.x built-in overflow protection
 */
contract ERC223Token is IERC223 {
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) private _balances;

    /**
     * @dev Deploys token and mints entire supply to deployer
     * @param _name Token name (e.g., "Saturn Token")
     * @param _symbol Token symbol (e.g., "SATURN")
     * @param _decimals Token decimals (e.g., 4)
     */
    constructor(string memory _name, string memory _symbol, uint8 _decimals) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        totalSupply = 1_000_000_000 * 10 ** decimals; // 1,000,000,000.0000 tokens

        // Mint entire supply to deployer
        _balances[msg.sender] = totalSupply;

        emit Transfer(address(0), msg.sender, totalSupply);
        emit ERC223Transfer(address(0), msg.sender, totalSupply, bytes(""));
    }

    function balanceOf(address account) external view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address to, uint256 value) external override returns (bool) {
        return _transfer(msg.sender, to, value, bytes(""));
    }

    function transfer(address to, uint256 value, bytes calldata data) external override returns (bool) {
        return _transfer(msg.sender, to, value, data);
    }

    /**
     * @dev Internal transfer implementation with security checks
     * @notice Follows CEI pattern and prevents common attack vectors
     */
    function _transfer(address from, address to, uint256 value, bytes memory data) internal returns (bool) {
        require(to != address(0), "ERC223: transfer to zero address");
        require(value <= _balances[from], "ERC223: insufficient balance");

        // Effects: Update balances before external call
        _balances[from] -= value;
        _balances[to] += value;

        // Interaction: Notify contract recipients only
        if (_isContract(to)) {
            IContractReceiver(to).tokenFallback(from, value, data);
        }

        // Events: Always emit both events per ERC223 spec
        emit Transfer(from, to, value);
        emit ERC223Transfer(from, to, value, data);

        return true;
    }

    /**
     * @dev Checks if address is a contract (post-0.8.1 method)
     */
    function _isContract(address account) internal view returns (bool) {
        return account.code.length > 0;
    }
}

/**
 * @title SaturnDEXToken
 * @notice Deploy this contract on each EVM chain
 */
contract SaturnDEXToken is ERC223Token {
    constructor() ERC223Token("Saturn Token", "SATURN", 4) {}
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"ERC223Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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