empacy/src/utils/logger.js

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import winston from 'winston';

/**
 * Winston logger configuration for Empacy
 * Provides structured logging with different levels and formats
 */
const logger = winston.createLogger({
  level: process.env.LOG_LEVEL || 'info',
  format: winston.format.combine(
    winston.format.timestamp({
      format: 'YYYY-MM-DD HH:mm:ss',
    }),
    winston.format.errors({ stack: true }),
    winston.format.json()
  ),
  defaultMeta: { service: 'empacy' },
  transports: [
    // Console transport for development
    new winston.transports.Console({
      format: winston.format.combine(
        winston.format.colorize(),
        winston.format.simple(),
        winston.format.printf(({ timestamp, level, message, service, ...meta }) => {
          let metaStr = '';
          if (Object.keys(meta).length > 0) {
            metaStr = ` ${JSON.stringify(meta)}`;
          }
          return `${timestamp} [${service}] ${level}: ${message}${metaStr}`;
        })
      ),
    }),
    
    // File transport for production logging
    new winston.transports.File({
      filename: 'logs/error.log',
      level: 'error',
      maxsize: 5242880, // 5MB
      maxFiles: 5,
    }),
    
    new winston.transports.File({
      filename: 'logs/combined.log',
      maxsize: 5242880, // 5MB
      maxFiles: 5,
    }),
  ],
});

// Create logs directory if it doesn't exist
import { mkdir } from 'fs/promises';
import { existsSync } from 'fs';

if (!existsSync('logs')) {
  mkdir('logs', { recursive: true }).catch(console.error);
}

// Add stream for Morgan HTTP logging
logger.stream = {
  write: (message) => {
    logger.info(message.trim());
  },
};

export { logger };