logger.js

import winston from "winston";
import DailyRotateFile from "winston-daily-rotate-file";
import path from "path";
import { fileURLToPath } from "url";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Define log levels
const levels = {
  error: 0,
  warn: 1,
  info: 2,
  http: 3,
  debug: 4,
};

// Define colors for each level
const colors = {
  error: "red",
  warn: "yellow",
  info: "green",
  http: "magenta",
  debug: "white",
};

winston.addColors(colors);

// Define log format
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}`
  )
);

// Define which logs to print based on environment
const level = () => {
  const env = process.env.NODE_ENV || "development";
  const isDevelopment = env === "development";
  return isDevelopment ? "debug" : "warn";
};

// Define transports
const transports = [
  // Console transport
  new winston.transports.Console({
    format: winston.format.combine(
      winston.format.colorize(),
      winston.format.simple()
    ),
  }),

  // Error log file - rotates daily
  new DailyRotateFile({
    filename: path.join(__dirname, "../../logs/error-%DATE%.log"),
    datePattern: "YYYY-MM-DD",
    level: "error",
    maxSize: "20m",
    maxFiles: "14d",
    format: winston.format.combine(
      winston.format.uncolorize(),
      winston.format.json()
    ),
  }),

  // Combined log file - all logs
  new DailyRotateFile({
    filename: path.join(__dirname, "../../logs/combined-%DATE%.log"),
    datePattern: "YYYY-MM-DD",
    maxSize: "20m",
    maxFiles: "14d",
    format: winston.format.combine(
      winston.format.uncolorize(),
      winston.format.json()
    ),
  }),

  // HTTP requests log
  new DailyRotateFile({
    filename: path.join(__dirname, "../../logs/http-%DATE%.log"),
    datePattern: "YYYY-MM-DD",
    level: "http",
    maxSize: "20m",
    maxFiles: "7d",
    format: winston.format.combine(
      winston.format.uncolorize(),
      winston.format.json()
    ),
  }),
];

// Create the logger
const logger = winston.createLogger({
  level: level(),
  levels,
  format,
  transports,
  exitOnError: false,
});

// Create a stream object for Morgan
logger.stream = {
  write: (message) => logger.http(message.trim()),
};

export default logger;