/**
 * Logging Module
 *
 * This module provides logging functionality with rotation support.
 * It uses winston for logging and winston-daily-rotate-file for rotation.
 *
 * @module logger
 */

import winston from "winston";
import DailyRotateFile from "winston-daily-rotate-file";
import { APP_CONFIG } from "../config/app.config.js";

/**
 * Log levels configuration
 * Defines the severity levels for logging
 */
const levels = {
  error: 0,
  warn: 1,
  info: 2,
  http: 3,
  debug: 4,
};

/**
 * Log level colors configuration
 * Defines colors for different log levels
 */
const colors = {
  error: "red",
  warn: "yellow",
  info: "green",
  http: "magenta",
  debug: "white",
};

/**
 * Add colors to winston
 */
winston.addColors(colors);

/**
 * Log format configuration
 * Defines how log messages are formatted
 */
const format = winston.format.combine(
  winston.format.timestamp({ format: "YYYY-MM-DD HH:mm:ss:ms" }),
  winston.format.colorize({ all: true }),
  winston.format.printf(
    (info) => `${info.timestamp} ${info.level}: ${info.message}`,
  ),
);

/**
 * Transport for daily rotating file
 * Configures how logs are rotated and stored
 */
const dailyRotateFileTransport = new DailyRotateFile({
  filename: "logs/%DATE%.log",
  datePattern: "YYYY-MM-DD",
  zippedArchive: true,
  maxSize: "20m",
  maxFiles: "14d",
  format: winston.format.combine(
    winston.format.uncolorize(),
    winston.format.timestamp(),
    winston.format.json(),
  ),
});

/**
 * Transport for error logs
 * Stores error logs in a separate file
 */
const errorFileTransport = new DailyRotateFile({
  filename: "logs/error-%DATE%.log",
  datePattern: "YYYY-MM-DD",
  level: "error",
  zippedArchive: true,
  maxSize: "20m",
  maxFiles: "14d",
  format: winston.format.combine(
    winston.format.uncolorize(),
    winston.format.timestamp(),
    winston.format.json(),
  ),
});

/**
 * Create the logger instance
 */
const logger = winston.createLogger({
  level: APP_CONFIG.NODE_ENV === "development" ? "debug" : "info",
  levels,
  format,
  transports: [
    new winston.transports.Console({
      format: winston.format.combine(
        winston.format.colorize(),
        winston.format.simple(),
      ),
    }),
    dailyRotateFileTransport,
    errorFileTransport,
  ],
});

/**
 * Export the logger instance
 */
export { logger };