/**
 * @file
 * Attaches behaviors for the Domain Source module.
 *
 * If Domain Access is present, we show/hide selected publishing domains. This approach
 * currently only works with a select field.
 */
(function ($) {

  "use strict";

  /**
   *
   * @type {Drupal~behavior}
   */
  Drupal.behaviors.domainSourceAllowed = {
    attach: function () {

      // Get the initial setting so that it can be reset.
      var initialOption = $("#edit-field-domain-source").val();

      // Onload, fire initial show/hide.
      getDomains();

      // Get the domains selected by the domain access field.
      function getDomains() {
        var domains = new Array();
        $("#edit-field-domain-access :checked").each(function(index, obj) {
          domains.push(obj.value);
        });
        setOptions(domains);
      }

      // Based on selected domains, show/hide the selection options.
      function setOptions(domains) {
        $("#edit-field-domain-source option").each(function(index, obj) {
          if (jQuery.inArray(obj.value, domains) == -1 && obj.value != '_none') {
            // If the current selection is removed, reset the selection to _none.
            if ($("#edit-field-domain-source").val() == obj.value) {
              $("#edit-field-domain-source").val('_none');
            }
            $("#edit-field-domain-source option[value=" + obj.value + "]").hide();
          }
          else {
            $("#edit-field-domain-source option[value=" + obj.value + "]").show();
            // If we reselected the initial value, reset the select option.
            if (obj.value == initialOption) {
              $("#edit-field-domain-source").val(obj.value);
            }
          }
        });
      }

      // When the selections change, recalculate the select options.
      $( "#edit-field-domain-access" ).on( "change", getDomains );
    }
  };

})(jQuery);