const LEVELS = { debug: 10, info: 20, warn: 30, error: 40 };

function currentLevel() {
    const raw = (process.env.LOG_LEVEL ?? 'info').toLowerCase();
    return LEVELS[raw] ?? LEVELS.info;
}

function timestamp() {
    return new Date().toISOString();
}

function log(level, ...args) {
    if (LEVELS[level] < currentLevel()) return;
    const stream = level === 'error' || level === 'warn' ? console.error : console.log;
    stream(`[${timestamp()}] [${level.toUpperCase()}]`, ...args);
}

export const logger = {
    debug: (...a) => log('debug', ...a),
    info: (...a) => log('info', ...a),
    warn: (...a) => log('warn', ...a),
    error: (...a) => log('error', ...a),
};

export default logger;