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

// Create logs directory if it doesn't exist
const logsDir = path.join(__dirname, '../logs');
if (!fs.existsSync(logsDir)) {
  fs.mkdirSync(logsDir);
}

// Define log format
const logFormat = winston.format.combine(
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
  winston.format.errors({ stack: true }),
  winston.format.splat(),
  winston.format.json()
);

// Console format for development
const consoleFormat = winston.format.combine(
  winston.format.colorize(),
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
  winston.format.printf(({ level, message, timestamp, ...meta }) => {
    return `${timestamp} [${level}]: ${message} ${Object.keys(meta).length ? JSON.stringify(meta, null, 2) : ''}`;
  })
);

// Create the logger
const logger = winston.createLogger({
  level: process.env.LOG_LEVEL || 'info',
  format: logFormat,
  transports: [
    // Write all logs to combined.log
    new winston.transports.File({
      filename: path.join(logsDir, 'combined.log'),
      maxsize: 5242880, // 5MB
      maxFiles: 5
    }),
    // Write error logs to error.log
    new winston.transports.File({
      filename: path.join(logsDir, 'error.log'),
      level: 'error',
      maxsize: 5242880, // 5MB
      maxFiles: 5
    })
  ],
  // Handle exceptions and rejections
  exceptionHandlers: [
    new winston.transports.File({
      filename: path.join(logsDir, 'exceptions.log')
    })
  ],
  rejectionHandlers: [
    new winston.transports.File({
      filename: path.join(logsDir, 'rejections.log')
    })
  ]
});

// Add console transport in development
if (process.env.NODE_ENV !== 'production') {
  logger.add(new winston.transports.Console({
    format: consoleFormat
  }));
}

module.exports = logger;