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

/**
 * Provides information about the content area.
 *
 * @export
 * @class NativeContent
 * @wType System.Windows.Interop.Content
 */
export class NativeContent {
  /**
   * Event for when the content area change its size.
   *
   * @memberof NativeContent
   */
  public readonly Resized: SubscriptionEvent<(x: any, y: any) => void> =
    new SubscriptionEvent();

  /**
   * Creates an instance of NativeContent.
   *
   * @param {Window} [nWindow]
   * @param {Document} [nDocument]
   * @memberof NativeContent
   */
  constructor(private nWindow?: Window, private nDocument?: Document) {
    nWindow = nWindow ?? window;
    nDocument = nDocument ?? document;
  }

  /**
   * Gets the browser's current zoom.
   *
   * @memberof NativeContent
   */
  public get ZoomFactor() {
    return this.nWindow.devicePixelRatio;
  }

  /**
   * Gets the width of the content area.
   *
   * @readonly
   * @type {number}
   * @memberof NativeContent
   */
  public get ActualWidth(): number {
    return (
      this.nWindow.innerWidth ||
      this.nDocument.documentElement.clientWidth ||
      this.nDocument.body.clientWidth
    );
  }

  /**
   * Gets the height of the content area.
   *
   * @readonly
   * @type {number}
   * @memberof NativeContent
   */
  public get ActualHeight(): number {
    return (
      this.nWindow.innerHeight ||
      this.nDocument.documentElement.clientHeight ||
      this.nDocument.body.clientHeight
    );
  }
}