/**
 * @file
 * A Backbone view for the aural feedback of the toolbar.
 */

(function (Backbone, Drupal) {

  "use strict";

  /**
   * Backbone view for the aural feedback of the toolbar.
   */
  Drupal.toolbar.ToolbarAuralView = Backbone.View.extend({

    /**
     * {@inheritdoc}
     */
    initialize: function (options) {
      this.strings = options.strings;

      this.listenTo(this.model, 'change:orientation', this.onOrientationChange);
      this.listenTo(this.model, 'change:activeTray', this.onActiveTrayChange);
    },

    /**
     * Announces an orientation change.
     *
     * @param Drupal.Toolbar.ToolbarModel model
     * @param String orientation
     *   The new value of the orientation attribute in the model.
     */
    onOrientationChange: function (model, orientation) {
      Drupal.announce(Drupal.t('Tray orientation changed to @orientation.', {
        '@orientation': orientation
      }));
    },

    /**
     * Announces a changed active tray.
     *
     * @param Drupal.Toolbar.ToolbarModel model
     * @param Element orientation
     *   The new value of the tray attribute in the model.
     */
    onActiveTrayChange: function (model, tray) {
      var relevantTray = (tray === null) ? model.previous('activeTray') : tray;
      var trayName = relevantTray.querySelector('.toolbar-tray-name').textContent;
      var text;
      if (tray === null) {
        text = Drupal.t('Tray "@tray" closed.', { '@tray': trayName });
      }
      else {
        text = Drupal.t('Tray "@tray" opened.', { '@tray': trayName });
      }
      Drupal.announce(text);
    }
  });

}(Backbone, Drupal));