/**
 * Winston Logger Configuration
 *
 * Centralized logging with file rotation and different log levels
 */

import winston from 'winston';
import DailyRotateFile from 'winston-daily-rotate-file';

// Custom 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(({ timestamp, level, message, ...meta }) => {
    const metaStr = Object.keys(meta).length ? JSON.stringify(meta, null, 2) : '';
    return `${timestamp} [${level}]: ${message} ${metaStr}`;
  })
);

// File transport for errors
const errorFileTransport = new DailyRotateFile({
  filename: 'logs/error-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  level: 'error',
  maxFiles: '30d',
  maxSize: '20m',
  format: logFormat,
});

// File transport for all logs
const combinedFileTransport = new DailyRotateFile({
  filename: 'logs/combined-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  maxFiles: '30d',
  maxSize: '20m',
  format: logFormat,
});

// Console transport
const consoleTransport = new winston.transports.Console({
  format: consoleFormat,
});

// Create logger instance
export const logger = winston.createLogger({
  level: process.env.LOG_LEVEL || 'info',
  format: logFormat,
  defaultMeta: { service: 'translate-api' },
  transports: [
    errorFileTransport,
    combinedFileTransport,
  ],
});

// Add console transport in development
if (process.env.NODE_ENV !== 'production') {
  logger.add(consoleTransport);
}

// Stream for Morgan HTTP logging
export const httpLogStream = {
  write: (message: string) => {
    logger.info(message.trim());
  },
};

// Helper functions
export const logError = (error: Error, context?: Record<string, any>) => {
  logger.error({
    message: error.message,
    stack: error.stack,
    ...context,
  });
};

export const logInfo = (message: string, meta?: Record<string, any>) => {
  logger.info(message, meta);
};

export const logWarn = (message: string, meta?: Record<string, any>) => {
  logger.warn(message, meta);
};

export const logDebug = (message: string, meta?: Record<string, any>) => {
  logger.debug(message, meta);
};