// Registers the rules namespace.
Drupal.rules = Drupal.rules || {};

(function($) {
  Drupal.behaviors.rules_autocomplete = {
    attach: function(context) {
      var autocomplete_settings = Drupal.settings.rules_autocomplete;

      $('input.rules-autocomplete').once(function() {
        var input = this;
        new Drupal.rules.autocomplete(input, autocomplete_settings[$(input).attr('id')]);
      });
    }
  };

  /**
   * Rules autocomplete object.
   */
  Drupal.rules.autocomplete = function(input, settings) {
    this.id = settings.inputId;
    this.uri = settings.source;
    this.jqObject = $('#' + this.id);
    this.cache = new Array();
    this.jqObject.addClass('ui-corner-left');

    this.opendByFocus = false;
    this.focusOpens = true;
    this.groupSelected = false;

    this.button = $('<span>&nbsp;</span>');
    this.button.attr( {
      'tabIndex': -1,
      'title': 'Show all items'
    });
    this.button.insertAfter(this.jqObject);

    this.button.button( {
      icons: {
        primary: 'ui-icon-triangle-1-s'
      },
      text: false
    });

    // Don't round the left corners.
    this.button.removeClass('ui-corner-all');
    this.button.addClass('ui-corner-right ui-button-icon rules-autocomplete-button');

    this.jqObject.autocomplete();
    this.jqObject.autocomplete("option", "minLength", 0);
    // Add a custom class, so we can style the autocomplete box without
    // interfering with other jquery autocomplete widgets.
    this.jqObject.autocomplete("widget").addClass('rules-autocomplete');

    // Save the current rules_autocomplete object, so it can be used in
    // handlers.
    var instance = this;

    // Event handlers
    this.jqObject.focus(function() {
      if (instance.focusOpens) {
        instance.toggle();
        instance.opendByFocus = true;
      }
      else {
        instance.focusOpens = true;
      }
    });

    // Needed when the window is closed but the textfield has the focus.
    this.jqObject.click(function() {
      // Since the focus event happens earlier then the focus event, we need to
      // check here, if the window should be opened.
      if (!instance.opendByFocus) {
        instance.toggle();
      }
      else {
        instance.opendByFocus = false;
      }
    });

    this.jqObject.bind("autocompleteselect", function(event, ui) {
      // If a group was selected then set the groupSelected to true for the
      // overriden close function from jquery autocomplete.
      if (ui.item.value.substring(ui.item.value.length - 1, ui.item.value.length) == ":") {
        instance.groupSelected = true;
      }
      instance.focusOpens = false;
      instance.opendByFocus = false;
    });

    this.jqObject.autocomplete("option", "source", function(request, response) {
      if (request.term in instance.cache) {
        response(instance.cache[request.term]);
        return;
      }
      $.ajax( {
        url: instance.uri + '/' + request.term,
        dataType: "json",
        success: function(data) {
          instance.success(data, request, response);
        }
      });
    });

    // Newer versions of jQuery UI use element.data('ui-autocomplete'), older
    // versions use element.data('autocomplete').
    var autocompleteDataKey = typeof(this.jqObject.data('autocomplete')) === 'object' ? 'autocomplete' : 'ui-autocomplete';

    // Since jquery autocomplete by default strips html text by using .text()
    // we need our own _renderItem function to display html content.
    this.jqObject.data(autocompleteDataKey)._renderItem = function(ul, item) {
      return $("<li></li>").data("item.autocomplete", item).append("<a>" + item.label + "</a>").appendTo(ul);
    };

    // Override close function
    this.jqObject.data(autocompleteDataKey).close = function (event) {
      var value = this.element.val();
      // If the selector is not a group, then trigger the close event an and
      // hide the menu.
      if (value === undefined || instance.groupSelected === false) {
        clearTimeout(this.closing);
        if (this.menu.element.is(":visible")) {
          this._trigger("close", event);
          this.menu.element.hide();
          // Use deactivate for older versions of jQuery UI.
          if (typeof(this.menu.deactivate) === 'function') {
            this.menu.deactivate();
          }
        }
      }
      else {
        // Else keep all open and trigger a search for the group.
        instance.jqObject.autocomplete("search", instance.jqObject.val());
        // After the suggestion box was opened again, we want to be able to
        // close it.
        instance.groupSelected = false;
      }
    };

    this.button.click(function() {
      instance.toggle();
    });

  };

  /**
   * Success function for Rules autocomplete object.
   */
  Drupal.rules.autocomplete.prototype.success = function(data, request, response) {
    var list = new Array();
    jQuery.each(data, function(index, value) {
      list.push( {
        label: value,
        value: index
      });
    });

    this.cache[request.term] = list;
    response(list);
  };

  /**
   * Open the autocomplete window.
   * @param searchFor The term for will be searched for. If undefined then the
   *                  entered input text will be used.
   */
  Drupal.rules.autocomplete.prototype.open = function(searchFor) {
    // If searchFor is undefined, we want to search for the passed argument.
    this.jqObject.autocomplete("search", ((searchFor === undefined) ? this.jqObject.val() : searchFor));
    this.button.addClass("ui-state-focus");
  };

  /**
   * Close the autocomplete window.
   */
  Drupal.rules.autocomplete.prototype.close = function() {
    this.jqObject.autocomplete("close");
    this.button.removeClass("ui-state-focus");
  };

  /**
   * Toogle the autcomplete window.
   */
  Drupal.rules.autocomplete.prototype.toggle = function() {
    if (this.jqObject.autocomplete("widget").is(":visible")) {
      this.close();
      this.focusOpens = true;
    }
    else {
      var groups = this.jqObject.val().split(":");
      var selector = "";
      for (var i=0; i<groups.length-1; i++) {
        selector = selector.concat(groups[i]) + ":";
      }
      this.focusOpens = false;
      this.jqObject.focus();
      this.open(selector);
    }
  };

})(jQuery);