import winston from 'winston';

export type Logger = winston.Logger;

export function createLogger(): Logger {
  return winston.createLogger({
    level: process.env.LOG_LEVEL || 'info',
    format: winston.format.combine(
      winston.format.timestamp(),
      winston.format.errors({ stack: true }),
      winston.format.json()
    ),
    transports: [
      new winston.transports.Console({
        format: winston.format.combine(
          winston.format.colorize(),
          winston.format.printf(({ level, message, timestamp, ...meta }) => {
            const metaStr = Object.keys(meta).length ? ` ${JSON.stringify(meta)}` : '';
            return `${timestamp} [${level}]: ${message}${metaStr}`;
          })
        ),
      }),
      new winston.transports.File({
        filename: 'logs/error.log',
        level: 'error',
      }),
      new winston.transports.File({
        filename: 'logs/combined.log',
      }),
    ],
  });
}