import { ConsoleAppender } from './appenders/ConsoleAppender';
import IAppender from './appenders/IAppender';
import {Logger} from './Logger';
import {LoggingLevel, LoggingLevelMapping, LoggingLevelType} from './LoggingLevel';
import {Threshold} from './Threshold';

export default class LoggerFactory {
  private static readonly _loggerForCategory: Map<string, Logger> = new Map();
  private static readonly _threshold: {level: LoggingLevel} = {level: LoggingLevel.Info};
  private static readonly _appenders: IAppender[] = [new ConsoleAppender()];    

  public static getLogger(category: string): Logger {
    let logger = LoggerFactory._loggerForCategory.get(category);

    if (logger === undefined) {
      logger = new Logger({category, threshold: new Threshold(LoggerFactory._threshold), appenders: LoggerFactory._appenders});
      
      LoggerFactory._loggerForCategory.set(category, logger);
    }

    return logger;
  }

  public static setLoggingLevel(level: LoggingLevelType): void {
    const loggingLevel = LoggingLevelMapping.convertLoggingLevelTypeToLoggingLevel(level);
    console.log(`${new Date().toISOString()} [LoggerFactory] Setting logging level to [${level}]`);
    LoggerFactory._threshold.level = loggingLevel;
  }

  private constructor() {
    throw new Error('[LoggerFactory] is a static class that may not be instantiated');
  }
}