define([
  'jquery'
], function ($) {
  function Search () { }

  Search.prototype.render = function (decorated) {
    var $rendered = decorated.call(this);
    var searchLabel = this.options.get('translations').get('search');

    var $search = $(
      '<span class="select2-search select2-search--dropdown">' +
        '<input class="select2-search__field" type="search" tabindex="-1"' +
        ' autocorrect="off" autocapitalize="none"' +
        ' spellcheck="false" role="searchbox" aria-autocomplete="list" />' +
      '</span>'
    );

    this.$searchContainer = $search;
    this.$search = $search.find('input');

    this.$search[0].autocomplete = this.options.get('autocomplete');
    this.$search[0].setAttribute('aria-label', searchLabel());

    $rendered.prepend($search);

    return $rendered;
  };

  Search.prototype.bind = function (decorated, container, $container) {
    var self = this;

    var resultsId = container.id + '-results';

    decorated.call(this, container, $container);

    this.$search.on('keydown', function (evt) {
      self.trigger('keypress', evt);

      self._keyUpPrevented = evt.isDefaultPrevented();
    });

    // Workaround for browsers which do not support the `input` event
    // This will prevent double-triggering of events for browsers which support
    // both the `keyup` and `input` events.
    this.$search.on('input', function (evt) {
      // Unbind the duplicated `keyup` event
      $(this).off('keyup');
    });

    this.$search.on('keyup input', function (evt) {
      self.handleSearch(evt);
    });

    container.on('open', function () {
      self.$search[0].setAttribute('tabindex', 0);
      self.$search[0].setAttribute('aria-controls', resultsId);

      self.$search.trigger('focus');

      window.setTimeout(function () {
        self.$search.trigger('focus');
      }, 0);
    });

    container.on('close', function () {
      self.$search[0].setAttribute('tabindex', -1);
      self.$search[0].removeAttribute('aria-controls');
      self.$search[0].removeAttribute('aria-activedescendant');

      self.$search.val('');
      self.$search.trigger('blur');
    });

    container.on('focus', function () {
      if (!container.isOpen()) {
        self.$search.trigger('focus');
      }
    });

    container.on('results:all', function (params) {
      if (params.query.term == null || params.query.term === '') {
        var showSearch = self.showSearch(params);

        if (showSearch) {
          self.$searchContainer[0].classList.remove('select2-search--hide');
        } else {
          self.$searchContainer[0].classList.add('select2-search--hide');
        }
      }
    });

    container.on('results:focus', function (params) {
      if (params.data._resultId) {
        self.$search[0]
          .setAttribute('aria-activedescendant', params.data._resultId);
      } else {
        self.$search[0].removeAttribute('aria-activedescendant');
      }
    });
  };

  Search.prototype.handleSearch = function (evt) {
    if (!this._keyUpPrevented) {
      var input = this.$search.val();

      this.trigger('query', {
        term: input
      });
    }

    this._keyUpPrevented = false;
  };

  Search.prototype.showSearch = function (_, params) {
    return true;
  };

  return Search;
});
