import * as winston from 'winston';

const defaultLevel = process.env.LOG_LEVEL || 'info';
const { colorize, combine, timestamp, printf } = winston.format;

interface LogInfo extends winston.Logform.TransformableInfo {
  timestamp?: string;
}

const myFormat = printf((info: LogInfo) => {
  // convert objects into strings
  if (typeof info.message === 'object') {
    info.message = JSON.stringify(info.message, null, 2);
  }
  return `[${info.timestamp}] ${info.level}: ${info.message}`;
});

const combinedFormats = combine(
  timestamp({
    format: 'YYYY-MM-DD HH:mm:ss'
  }),
  colorize(),
  myFormat,
);

const logger: winston.Logger = winston.createLogger({
  format: combinedFormats,
  level: defaultLevel,
  transports: [
    new winston.transports.Console(),
  ],
});

export default logger;