import { Injectable } from '@angular/core';

@Injectable()
export class LoggerService {

  public level: number = 3;

  public levelDefs = {
    OFF: 0,
    ERROR: 1,
    WARN: 2,
    INFO: 3,
    DEBUG: 4,
    LOG: 5
  };

  constructor() {
    // ...
  }

  public setLogLevel(logLevel: 'OFF'|'ERROR'|'WARN'|'INFO'|'DEBUG') {
    switch (logLevel) {
      case 'OFF':
        this.level = this.levelDefs.OFF;
        break;
      case 'ERROR':
        this.level = this.levelDefs.ERROR;
        break;
      case 'WARN':
        this.level = this.levelDefs.WARN;
        break;
      case 'INFO':
        this.level = this.levelDefs.INFO;
        break;
      case 'DEBUG':
        this.level = this.levelDefs.DEBUG;
        break;
      default:
        this.level = this.levelDefs.LOG;
        break;
    }
  }

  public error(...args): void {
    this._call(this.levelDefs.ERROR, 'error', ...args);
  }

  public warn(...args): void {
    this._call(this.levelDefs.WARN, 'warn', ...args);
  }

  public info(...args): void {
    this._call(this.levelDefs.INFO, 'info', ...args);
  }

  public debug(...args): void {
    this._call(this.levelDefs.DEBUG, 'debug', ...args);
  }

  public log(...args): void {
    this._call(this.levelDefs.LOG, 'log', ...args);
  }

  private _call(level: number, type: string, ...args) {
    if (this.level >= level) {
      console[type].apply(console, args);
    }
  }

}