text: define([
    'jquery',
    './utils'
  ], function ($, Utils) {
    function Results ($element, options, dataAdapter) {
      this.$element = $element;
      this.data = dataAdapter;
      this.options = options;
  
      Results.__super__.constructor.call(this);
    }
  
    Utils.Extend(Results, Utils.Observable);
  
    Results.prototype.render = function () {
      var $results = $(
        '<ul class="select2-results__options" role="tree"></ul>'
      );
  
      if (this.options.get('multiple')) {
        $results.attr('aria-multiselectable', 'true');
      }
  
      this.$results = $results;
  
      return $results;
    };
  
    Results.prototype.clear = function () {
      this.$results.empty();
    };
  
    Results.prototype.displayMessage = function (params) {
      var escapeMarkup = this.options.get('escapeMarkup');
  
      this.clear();
      this.hideLoading();
  
      var $message = $(
        '<li role="treeitem" aria-live="assertive"' +
        ' class="select2-results__option"></li>'
      );
  
      var message = this.options.get('translations').get(params.message);
  
      $message.append(
        escapeMarkup(
          message(params.args)
        )
      );
  
      $message[0].className += ' select2-results__message';
  
      this.$results.append($message);
    };
  
    Results.prototype.hideMessages = function () {
      this.$results.find('.select2-results__message').remove();
    };
  
    Results.prototype.append = function (data) {
      this.hideLoading();
  
      var $options = [];
  
      if (data.results == null || data.results.length === 0) {
        if (this.$results.children().length === 0) {
          this.trigger('results:message', {
            message: 'noResults'
          });
        }
  
        return;
      }
  
      data.results = this.sort(data.results);
  
      for (var d = 0; d < data.results.length; d++) {
        var item = data.results[d];
  
        var $option = this.option(item);
  
        $options.push($option);
      }
  
      this.$results.append($options);
    };
  
    Results.prototype.position = function ($results, $dropdown) {
      var $resultsContainer = $dropdown.find('.select2-results');
      $resultsContainer.append($results);
    };
  
    Results.prototype.sort = function (data) {
      var sorter = this.options.get('sorter');
  
      return sorter(data);
    };
  
    Results.prototype.highlightFirstItem = function () {
      var $options = this.$results
        .find('.select2-results__option[aria-selected]');
  
      var $selected = $options.filter('[aria-selected=true]');
  
      // Check if there are any selected options
      if ($selected.length > 0) {
        // If there are selected options, highlight the first
        $selected.first().trigger('mouseenter');
      } else {
        // If there are no selected options, highlight the first option
        // in the dropdown
        $options.first().trigger('mouseenter');
      }
  
      this.ensureHighlightVisible();
    };
  
    Results.prototype.setClasses = function () {
      var self = this;
  
      this.data.current(function (selected) {
        var selectedIds = $.map(selected, function (s) {
          return s.id.toString();
        });
  
        var $options = self.$results
          .find('.select2-results__option[aria-selected]');
  
        $options.each(function () {
          var $option = $(this);
  
          var item = Utils.GetData(this, 'data');
  
          // id needs to be converted to a string when comparing
          var id = '' + item.id;
  
          if ((item.element != null && item.element.selected) ||
              (item.element == null && $.inArray(id, selectedIds) > -1)) {
            $option.attr('aria-selected', 'true');
          } else {
            $option.attr('aria-selected', 'false');
          }
        });
  
      });
    };
  
    Results.prototype.showLoading = function (params) {
      this.hideLoading();
  
      var loadingMore = this.options.get('translations').get('searching');
  
      var loading = {
        disabled: true,
        loading: true,
        text: loadingMore(params)
      };
      var $loading = this.option(loading);
      $loading.className += ' loading-results';
  
      this.$results.prepend($loading);
    };
  
    Results.prototype.hideLoading = function () {
      this.$results.find('.loading-results').remove();
    };
  
    Results.prototype.option = function (data) {
      var option = document.createElement('li');
      option.className = 'select2-results__option';
  
      var attrs = {
        'role': 'treeitem',
        'aria-selected': 'false'
      };
  
      if (data.disabled) {
        delete attrs['aria-selected'];
        attrs['aria-disabled'] = 'true';
      }
  
      if (data.id == null) {
        delete attrs['aria-selected'];
      }
  
      if (data._resultId != null) {
        option.id = data._resultId;
      }
  
      if (data.title) {
        option.title = data.title;
      }
  
      if (data.children) {
        attrs.role = 'group';
        attrs['aria-label'] = data.text;
        delete attrs['aria-selected'];
      }
  
      for (var attr in attrs) {
        var val = attrs[attr];
  
        option.setAttribute(attr, val);
      }
  
      if (data.children) {
        var $option = $(option);
  
        var label = document.createElement('strong');
        label.className = 'select2-results__group';
  
        var $label = $(label);
        this.template(data, label);
  
        var $children = [];
  
        for (var c = 0; c < data.children.length; c++) {
          var child = data.children[c];
  
          var $child = this.option(child);
  
          $children.push($child);
        }
  
        var $childrenContainer = $('<ul></ul>', {
          'class': 'select2-results__options select2-results__options--nested'
        });
  
        $childrenContainer.append($children);
  
        $option.append(label);
        $option.append($childrenContainer);
      } else {
        this.template(data, option);
      }
  
      Utils.StoreData(option, 'data', data);
  
      return option;
    };
  
    Results.prototype.bind = function (container, $container) {
      var self = this;
  
      var id = container.id + '-results';
  
      this.$results.attr('id', id);
  
      container.on('results:all', function (params) {
        self.clear();
        self.append(params.data);
  
        if (container.isOpen()) {
          self.setClasses();
          if (self.options.get('scrollAfterSelect')) {
            self.highlightFirstItem();
          }
        }
      });
  
      container.on('results:append', function (params) {
        self.append(params.data);
  
        if (container.isOpen()) {
          self.setClasses();
        }
      });
  
      container.on('query', function (params) {
        self.hideMessages();
        self.showLoading(params);
      });
  
      container.on('select', function () {
        if (!container.isOpen()) {
          return;
        }
  
        self.setClasses();
  
        if (self.options.get('scrollAfterSelect')) {
          self.highlightFirstItem();
        }
      });
  
      container.on('unselect', function () {
        if (!container.isOpen()) {
          return;
        }
  
        self.setClasses();
  
        if (self.options.get('scrollAfterSelect')) {
          self.highlightFirstItem();
        }
      });
  
      container.on('open', function () {
        // When the dropdown is open, aria-expended="true"
        self.$results.attr('aria-expanded', 'true');
        self.$results.attr('aria-hidden', 'false');
  
        self.setClasses();
        self.ensureHighlightVisible();
      });
  
      container.on('close', function () {
        // When the dropdown is closed, aria-expended="false"
        self.$results.attr('aria-expanded', 'false');
        self.$results.attr('aria-hidden', 'true');
        self.$results.removeAttr('aria-activedescendant');
      });
  
      container.on('results:toggle', function () {
        var $highlighted = self.getHighlightedResults();
  
        if ($highlighted.length === 0) {
          return;
        }
  
        $highlighted.trigger('mouseup');
      });
  
      container.on('results:select', function () {
        var $highlighted = self.getHighlightedResults();
  
        if ($highlighted.length === 0) {
          return;
        }
  
        var data = Utils.GetData($highlighted[0], 'data');
  
        if ($highlighted.attr('aria-selected') == 'true') {
          self.trigger('close', {});
        } else {
          self.trigger('select', {
            data: data
          });
        }
      });
  
      container.on('results:previous', function () {
        var $highlighted = self.getHighlightedResults();
  
        var $options = self.$results.find('[aria-selected]');
  
        var currentIndex = $options.index($highlighted);
  
        // If we are already at the top, don't move further
        // If no options, currentIndex will be -1
        if (currentIndex <= 0) {
          return;
        }
  
        var nextIndex = currentIndex - 1;
  
        // If none are highlighted, highlight the first
        if ($highlighted.length === 0) {
          nextIndex = 0;
        }
  
        var $next = $options.eq(nextIndex);
  
        $next.trigger('mouseenter');
  
        var currentOffset = self.$results.offset().top;
        var nextTop = $next.offset().top;
        var nextOffset = self.$results.scrollTop() + (nextTop - currentOffset);
  
        if (nextIndex === 0) {
          self.$results.scrollTop(0);
        } else if (nextTop - currentOffset < 0) {
          self.$results.scrollTop(nextOffset);
        }
      });
  
      container.on('results:next', function () {
        var $highlighted = self.getHighlightedResults();
  
        var $options = self.$results.find('[aria-selected]');
  
        var currentIndex = $options.index($highlighted);
  
        var nextIndex = currentIndex + 1;
  
        // If we are at the last option, stay there
        if (nextIndex >= $options.length) {
          return;
        }
  
        var $next = $options.eq(nextIndex);
  
        $next.trigger('mouseenter');
  
        var currentOffset = self.$results.offset().top +
          self.$results.outerHeight(false);
        var nextBottom = $next.offset().top + $next.outerHeight(false);
        var nextOffset = self.$results.scrollTop() + nextBottom - currentOffset;
  
        if (nextIndex === 0) {
          self.$results.scrollTop(0);
        } else if (nextBottom > currentOffset) {
          self.$results.scrollTop(nextOffset);
        }
      });
  
      container.on('results:focus', function (params) {
        params.element.addClass('select2-results__option--highlighted');
      });
  
      container.on('results:message', function (params) {
        self.displayMessage(params);
      });
  
      if ($.fn.mousewheel) {
        this.$results.on('mousewheel', function (e) {
          var top = self.$results.scrollTop();
  
          var bottom = self.$results.get(0).scrollHeight - top + e.deltaY;
  
          var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
          var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();
  
          if (isAtTop) {
            self.$results.scrollTop(0);
  
            e.preventDefault();
            e.stopPropagation();
          } else if (isAtBottom) {
            self.$results.scrollTop(
              self.$results.get(0).scrollHeight - self.$results.height()
            );
  
            e.preventDefault();
            e.stopPropagation();
          }
        });
      }
  
      this.$results.on('mouseup', '.select2-results__option[aria-selected]',
        function (evt) {
        var $this = $(this);
  
        var data = Utils.GetData(this, 'data');
  
        if ($this.attr('aria-selected') === 'true') {
          if (self.options.get('multiple')) {
            self.trigger('unselect', {
              originalEvent: evt,
              data: data
            });
          } else {
            self.trigger('close', {});
          }
  
          return;
        }
  
        self.trigger('select', {
          originalEvent: evt,
          data: data
        });
      });
  
      this.$results.on('mouseenter', '.select2-results__option[aria-selected]',
        function (evt) {
        var data = Utils.GetData(this, 'data');
  
        self.getHighlightedResults()
            .removeClass('select2-results__option--highlighted');
  
        self.trigger('results:focus', {
          data: data,
          element: $(this)
        });
      });
    };
  
    Results.prototype.getHighlightedResults = function () {
      var $highlighted = this.$results
      .find('.select2-results__option--highlighted');
  
      return $highlighted;
    };
  
    Results.prototype.destroy = function () {
      this.$results.remove();
    };
  
    Results.prototype.ensureHighlightVisible = function () {
      var $highlighted = this.getHighlightedResults();
  
      if ($highlighted.length === 0) {
        return;
      }
  
      var $options = this.$results.find('[aria-selected]');
  
      var currentIndex = $options.index($highlighted);
  
      var currentOffset = this.$results.offset().top;
      var nextTop = $highlighted.offset().top;
      var nextOffset = this.$results.scrollTop() + (nextTop - currentOffset);
  
      var offsetDelta = nextTop - currentOffset;
      nextOffset -= $highlighted.outerHeight(false) * 2;
  
      if (currentIndex <= 2) {
        this.$results.scrollTop(0);
      } else if (offsetDelta > this.$results.outerHeight() || offsetDelta < 0) {
        this.$results.scrollTop(nextOffset);
      }
    };
  
    Results.prototype.template = function (result, container) {
      var template = this.options.get('templateResult');
      var escapeMarkup = this.options.get('escapeMarkup');
  
      var content = template(result, container);
  
      if (content == null) {
        container.style.display = 'none';
      } else if (typeof content === 'string') {
        container.innerHTML = escapeMarkup(content);
      } else {
        $(container).append(content);
      }
    };
  
    return Results;
  });
  