/*
 * Copyright (c) 2010, 2023 BSI Business Systems Integration AG
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 */
import {BrowserField, Dimension, FormFieldLayout, HtmlCompPrefSizeOptions} from '../../../index';
import $ from 'jquery';

export class BrowserFieldLayout extends FormFieldLayout {
  browserField: BrowserField;

  constructor(browserField: BrowserField) {
    super(browserField);
    this.browserField = browserField;
  }

  override preferredLayoutSize($container: JQuery, options: HtmlCompPrefSizeOptions): Dimension {
    let prefSize = super.preferredLayoutSize($container, options);
    if (this._isIFrameReadable()) {
      prefSize.height = this.browserField.$field.contents().height() + // get height of content
        this.browserField.iframe.htmlComp.insets().vertical() + // add insets of iframe
        this.browserField.htmlComp.insets().vertical(); // add insets of browser field
    }
    return prefSize;
  }

  protected _isIFrameReadable(): boolean {
    let field = this.browserField;
    let perms = field.sandboxPermissions;
    if (field.sandboxEnabled && (perms && perms.indexOf('allow-same-origin') === -1)) {
      $.log.isWarnEnabled() && $.log.warn('Access to IFrame denied, cannot read height.' +
        ' Reason: sandbox is enabled or "allow-same-origin" is not set');
      return false;
    }
    try {
      (field.$field[0] as HTMLIFrameElement).contentWindow.document;
    } catch (e) {
      $.log.isWarnEnabled() && $.log.warn('Access to IFrame denied, cannot read height. Reason: denied by browser');
      return false;
    }
    if (field.$field.contents().attr('readyState') === 'loading') {
      $.log.isWarnEnabled() && $.log.warn('Access to IFrame denied, cannot read height. Reason: readyState == "loading"');
      return false;
    }
    return true;
  }
}