ptb-be/utils/logger.js

const fs = require('fs');
const path = require('path');

const LOG_FILE = path.join(process.cwd(), 'application.log');

/**
 * Format log entry dengan timestamp dan metadata
 */
const formatLog = (level, context, message, meta = {}) => {
  const timestamp = new Date().toISOString();
  const metaStr = Object.keys(meta).length ? ` | ${JSON.stringify(meta)}` : '';
  return `[${timestamp}] [${level}] [${context}] ${message}${metaStr}\n`;
};

/**
 * Write ke file synchronously (simple, no dependencies)
 * ponytail: pakai sync untuk guarantee write, upgrade to stream jika high volume
 */
const writeLog = (entry) => {
  try {
    fs.appendFileSync(LOG_FILE, entry, 'utf8');
  } catch (err) {
    console.error('[Logger] Failed to write log file:', err.message);
  }
};

module.exports = {
  logInfo: (context, message, meta = {}) => {
    const entry = formatLog('INFO', context, message, meta);
    console.log(entry.trim());
    writeLog(entry);
  },

  logError: (context, message, meta = {}) => {
    const entry = formatLog('ERROR', context, message, meta);
    console.error(entry.trim());
    writeLog(entry);
  },

  logWarn: (context, message, meta = {}) => {
    const entry = formatLog('WARN', context, message, meta);
    console.warn(entry.trim());
    writeLog(entry);
  },
};