/**
 * @file entity_browser.view.js
 *
 * Defines the behavior of the entity browser's view widget.
 */

(function ($, Drupal, drupalSettings, once) {

  'use strict';

  /**
   * Registers behaviours related to view widget.
   */
  Drupal.behaviors.entityBrowserView = {
    attach: function (context) {
      // Add the AJAX to exposed forms.
      // We do this as the selector in core/modules/views/js/ajax_view.js
      // assumes that the form the exposed filters reside in has a
      // views-related ID, which ours does not.
      var views_instance = Drupal.views.instances[Object.keys(Drupal.views.instances)[0]];
      if (views_instance) {
        views_instance.$exposed_form = $('.js-view-dom-id-' + views_instance.settings.view_dom_id + ' .views-exposed-form');
        $(once('exposed-form', views_instance.$exposed_form)).each(jQuery.proxy(views_instance.attachExposedFormAjax, views_instance));

        // The form values form_id, form_token, and form_build_id will break
        // the exposed form. Remove them by splicing the end of form_values.
        if (views_instance.exposedFormAjax && views_instance.exposedFormAjax.length > 0) {
          var ajax = views_instance.exposedFormAjax[0];
          ajax.options.beforeSubmit = function (form_values, element_settings, options) {
            form_values = form_values.splice(form_values.length - 3, 3);
            ajax.ajaxing = true;
            return ajax.beforeSubmit(form_values, element_settings, options);
          };
        }

        // Handle Enter key press in the views exposed form text fields: ensure
        // that the correct button is used for the views exposed form submit.
        // The default browser behavior for the Enter key press is to click the
        // first found button. But there can be other buttons in the form, for
        // example, ones added by the Tabs widget selector plugin.
        $(once('submit-by-enter-key', views_instance.$exposed_form)).find('input[type="text"]').each(function () {
          $(this).on('keypress', function (event) {
            if (event.keyCode == 13) {
              event.preventDefault();
              views_instance.$exposed_form.find('input[type="submit"]').first().click();
            }
          });
        });

        // If "auto_select" functionality is enabled, then selection column is
        // hidden and click on row will actually add element into selection
        // display over javascript event. Currently only multistep display
        // supports that functionality.
        if (drupalSettings.entity_browser_widget.auto_select) {
          var selection_cells = views_instance.$view.find('.views-field-entity-browser-select');
          if (selection_cells.length > 0) {
            // Register on cell parents (rows) click event.
            $(once('register-row-click', selection_cells.parent()))
              .click(function (event) {
                event.preventDefault();

                var $row = $(this);

                // Ensure the use of the entity browser input.
                var $input = $row.find('.views-field-entity-browser-select input.form-checkbox, .views-field-entity-browser-select input.form-radio');

                // Get selection display element and trigger adding of entity
                // over ajax request.
                $row.parents('form')
                  .find('.entities-list')
                  .trigger('add-entities', [[$input.val()]]);
              });

            // Hide selection cells (selection column) with checkboxes.
            selection_cells.hide();
          }
        }
      }
    }
  };

}(jQuery, Drupal, drupalSettings, once));