import { LogLevel } from './log-message';
import Logger from './logger';

const ROOT_LOGGER_NAME = 'ROOT';

/* tslint:disable:max-classes-per-file*/
export class LogService {

  private loggers: { [key: string]: Logger };

  public get ROOT_LOGGER() {
    return this.loggers[ROOT_LOGGER_NAME];
  }

  public constructor() {
    this.loggers = {};
    this.loggers[ROOT_LOGGER_NAME] =
      new Logger(ROOT_LOGGER_NAME, undefined, LogLevel.ALL);
  }

  public getLogger(name: string, threshold?: LogLevel): Logger {
    if (this.loggers.hasOwnProperty(name)) { return this.loggers[name]; }

    let parentLogger: Logger;

    const parentLoggerName = Object.keys(this.loggers)
      .filter((n: string) => name.startsWith(n))
      .reduce((acc: string, cur: string) => acc.length > cur.length ? acc : cur, '');

    if (parentLoggerName) {
      parentLogger = this.loggers[parentLoggerName];
    } else {
      parentLogger = this.ROOT_LOGGER;
    }

    this.loggers[name] = parentLogger.createChildLogger(name, threshold);
    return this.loggers[name];
  }
}

export const logService = new LogService();
export default logService;