import * as Winston from 'winston';

/**
 *
 * LogFactory for init and get logger
 *
 * logger is actually a Winston Logger instance https://github.com/winstonjs/winston/blob/master/README.md
 * use {LogConfigLoader} to transform config file to winston transport
 *
 */
export class LogFactory {

  private static logger: Winston.LoggerInstance;

  public static init(configDir: string, logDir: string, env: string) {

    let defaultLogLevel = 'debug';
    const consoleTransport: Winston.TransportInstance = new (Winston.transports.Console)({
      colorize: true,
      prettyPrint: true,
      timestamp: true,
      showLevel: true
    });

    const fileLogOptions = {
      level: 'debug',
      filename: `${env}.log`,
      dirname: logDir,
      timestamp: true,
      maxFiles: 30
    };

    if (env === 'production') {
      defaultLogLevel = 'info';
      fileLogOptions.level = 'info';
    }

    const fileTransports: Winston.TransportInstance = new (Winston.transports.File)(fileLogOptions);

    this.logger = new (Winston.Logger)({
      level: defaultLogLevel,
      transports: [consoleTransport, fileTransports]
    });
  }

  public static getLogger() {
      return this.logger;
  }
}