import { TimeRange } from '../baseframework';
import { SubscriptionEvent } from '../utils/SubscriptionEvent';

/**
 *   Class to execute operations on a regular time interval
 *
 * @export
 * @class DispatcherTimer
 * @wType System.Windows.Threading.DispatcherTimer
 */
export class DispatcherTimer {
  /**
   *  Time interval
   *
   * @type {TimeRange}
   * @memberof DispatcherTimer
   */
  public Interval: TimeRange = TimeRange.FromMilliseconds(1000);

  /**
   *   Event that is executed in the specificed time interval
   *
   * @memberof DispatcherTimer
   */
  public Tick: SubscriptionEvent<(e: any, a: any) => void> =
    new SubscriptionEvent();

  private intervalToCancel = -1;
  private enabled = false;

  /**
   *   Verifies if the the timer is enable
   *
   * @memberof DispatcherTimer
   */
  public get IsEnabled() {
    return this.enabled;
  }
  public set IsEnabled(value: boolean) {
    this.enabled = value;
  }

  /**
   *  Starts the interval object
   *
   * @memberof DispatcherTimer
   */
  public Start() {
    this.enabled = true;
    if (this.intervalToCancel === -1) {
      this.intervalToCancel = window.setInterval(() => {
        this.Tick.fire([this, null]);
      }, this.Interval.TotalMilliseconds);
    }
  }

  /**
   *  Stops the interval
   *
   * @memberof DispatcherTimer
   */
  public Stop(): void {
    this.enabled = false;
    window.clearInterval(this.intervalToCancel);
    this.intervalToCancel = -1;
  }
}