/**
 * @file
 * A Backbone Model for the toolbar.
 */

(function (Backbone, Drupal) {

  "use strict";

  /**
   * Backbone model for the toolbar.
   */
  Drupal.toolbar.ToolbarModel = Backbone.Model.extend({
    defaults: {
      // The active toolbar tab. All other tabs should be inactive under
      // normal circumstances. It will remain active across page loads. The
      // active item is stored as an ID selector e.g. '#toolbar-item--1'.
      activeTab: null,
      // Represents whether a tray is open or not. Stored as an ID selector e.g.
      // '#toolbar-item--1-tray'.
      activeTray: null,
      // Indicates whether the toolbar is displayed in an oriented fashion,
      // either horizontal or vertical.
      isOriented: false,
      // Indicates whether the toolbar is positioned absolute (false) or fixed
      // (true).
      isFixed: false,
      // Menu subtrees are loaded through an AJAX request only when the Toolbar
      // is set to a vertical orientation.
      areSubtreesLoaded: false,
      // If the viewport overflow becomes constrained, isFixed must be true so
      // that elements in the trays aren't lost off-screen and impossible to
      // get to.
      isViewportOverflowConstrained: false,
      // The orientation of the active tray.
      orientation: 'vertical',
      // A tray is locked if a user toggled it to vertical. Otherwise a tray
      // will switch between vertical and horizontal orientation based on the
      // configured breakpoints. The locked state will be maintained across page
      // loads.
      locked: false,
      // Indicates whether the tray orientation toggle is visible.
      isTrayToggleVisible: false,
      // The height of the toolbar.
      height: null,
      // The current viewport offsets determined by Drupal.displace(). The
      // offsets suggest how a module might position is components relative to
      // the viewport.
      offsets: {
        top: 0,
        right: 0,
        bottom: 0,
        left: 0
      }
    },

    /**
     * {@inheritdoc}
     */
    validate: function (attributes, options) {
      // Prevent the orientation being set to horizontal if it is locked, unless
      // override has not been passed as an option.
      if (attributes.orientation === 'horizontal' && this.get('locked') && !options.override) {
        return Drupal.t('The toolbar cannot be set to a horizontal orientation when it is locked.');
      }
    }
  });

}(Backbone, Drupal));