export class ChildWindowService {
  /**
   * Stores the opening child window status.
   *
   * @private
   * @static
   * @memberof ChildWindowService
   */
  // eslint-disable-next-line @typescript-eslint/naming-convention
  private static _isOpeningChildWindow = false;

  /**
   * Stores callback functions to call when child window has finished opening.
   *
   * @private
   * @static
   * @memberof ChildWindowService
   */
  // eslint-disable-next-line @typescript-eslint/naming-convention
  private static _endOpeningCallbacks: (() => void)[] = [];

  /**
   * Indicates if a child window is opening, i.e., it has
   * started to open, but has not finish opening yet.
   *
   * @readonly
   * @static
   * @type {boolean}
   * @memberof ChildWindowService
   */
  public static get IsOpening(): boolean {
    return ChildWindowService._isOpeningChildWindow;
  }

  /**
   * Signal `ChildWindowService` that a child window is about to be opened.
   *
   * @static
   * @memberof ChildWindowService
   */
  public static BeginOpening(): void {
    ChildWindowService._isOpeningChildWindow = true;
  }

  /**
   * Signal `ChildWindowService` that a child window has finish opening.
   *
   * @static
   * @memberof ChildWindowService
   */
  public static EndOpening(): void {
    ChildWindowService._isOpeningChildWindow = false;
    ChildWindowService._endOpeningCallbacks.forEach((x) => x());
    ChildWindowService._endOpeningCallbacks.length = 0;
  }

  /**
   * Register a callback function which will be called when the child window
   * has finish opening (i.e. after opening animation has ended).
   *
   * @static
   * @param {() => void} func
   * @memberof ChildWindowService
   */
  public static RegisterEndOpeningCallback(func: () => void): void {
    ChildWindowService._endOpeningCallbacks.push(func);
  }
}