"use strict";

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2014, 2017
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define(['bi/commons/ui/View', 'jquery', 'underscore', 'bi/commons/utils/BidiUtil', 'text!../templates/Menu.html'], function (View, $, _, bidi, template) {
  var MenuItem = null;
  /**
   * Represents a drop down menu that can be added to an app bar
   */

  MenuItem = View.extend({
    templateString: template,
    events: {
      'keydown': '_handleKeyboard',
      'click .dropdown-menuitem': '_handleClick'
    },
    itemActions: null,
    itemSpecMap: null,
    baseClass: 'toolbar',
    hcLabel: null,
    // create an element for high contrast label
    showTitle: true,

    /**
     * Creates a new menu item
     *
     * @param spec -
     *            The menu item spec
     * @param root -
     *            A reference to the root menu item, where items go if the app bar is collapsed horizontally
     */
    init: function init(spec) {
      _.defaults(spec, {
        hcLabel: true
      });

      _.extend(this, spec);

      this.itemActions = {};
      this.itemSpecMap = {};

      _.each(this.items, function (item) {
        this.itemSpecMap[item.name] = item;
      }.bind(this));

      MenuItem.inherited('init', this, arguments);
    },
    _handleClick: function _handleClick(event) {
      event.preventDefault();

      this._performAction(event.currentTarget.id);
    },
    _performAction: function _performAction(id) {
      var action = this.itemActions[id];

      if (action) {
        // Delay the action slightly to allow bootstrap to close the menu before
        // the action is fired
        setTimeout(function () {
          action();
        }, 10);
      }
    },

    /**
     * Removes a menu item
     */
    removeItem: function removeItem(name) {
      var id = this.viewId + '_' + name;
      this.$menu.children('#' + id).remove();
      delete this.itemSpecMap[name];
      delete this.itemActions[id];
    },
    addDivider: function addDivider() {
      var divider = $('<li role="presentation" class="divider">');
      this.$menu.append(divider);
      return divider;
    },

    /**
     * Adds a new menu item to the drop down
     */
    addItem: function addItem(item) {
      this.itemSpecMap[item.name] = item;
      var menuItem = $('<li id="' + this._getItemId(item.name) + '">');
      var action = null;

      if (item.checked) {
        action = $('<a role="menuitem" href="#" aria-label="' + item.label + '" aria-checked="true" class="menuitem-toggled">' + item.label + '</a>');
      } else {
        action = $('<a role="menuitem" href="#" aria-label="' + item.label + '" aria-checked="false">' + item.label + '</a>');
      }

      menuItem.append(action);
      menuItem.addClass('dropdown-menuitem');
      menuItem.addClass(item.name);
      this.$menu.append(menuItem);

      this._buildMenuItem(item);

      return menuItem;
    },
    showItem: function showItem(name) {
      this.$menu.find('.' + name).removeClass('hidden');
    },
    hideItem: function hideItem(name) {
      this.$menu.find('.' + name).addClass('hidden');
    },

    /*jshint maxcomplexity:13 */
    _handleKeyboard: function _handleKeyboard(e) {
      var keyCode = e.which || e.keyCode || e.charCode;
      var $target = $(e.target);
      var $nextFocus;

      switch (keyCode) {
        case 9:
          //tabkey
          if (e.shiftKey) {
            if ($target.hasClass('firstMenuItem')) {
              $nextFocus = $target.closest('ul').find('a.lastMenuItem');
              $nextFocus.focus();
              e.preventDefault();
            }
          } else {
            if ($target.hasClass('lastMenuItem')) {
              $nextFocus = $target.closest('ul').find('a.firstMenuItem');
              $nextFocus.focus();
              e.preventDefault();
            }
          }

          break;

        case 13: // enter key

        case 32:
          // space
          e.preventDefault();
          this.$toggle.dropdown('toggle');

          if ($(e.target).hasClass('dropdown-toggle')) {
            var first = this.$el.find('.dropdown-menu a').first();
            first.focus();
          } else {
            var currentItem = this.getTarget(e.target, 'dropdown-menuitem');

            this._performAction(currentItem.id);
          }

          break;

        case 37: // left arrow

        case 39:
          // right arrow
          if ($(e.target.parentNode).hasClass('dropdown-menuitem')) {
            var downKeyEvt = _.clone(e);

            downKeyEvt.keyCode = keyCode + 1; // left to up arrow: 38, right to down arrow:40;

            $(e.target).trigger(downKeyEvt); // delegate to bootstrap
          }

          break;

        default:
          break;
      }
    },
    _templateParams: function _templateParams() {
      return {
        id: this.viewId,
        items: this.items,
        label: this.label,
        icon: this.icon,
        hcLabel: this.hcLabel,
        baseClass: this.baseClass,
        labelOnly: this.labelOnly,
        showTitle: this.showTitle
      };
    },

    /**
     * Draws the MenuItem
     */
    render: function render() {
      var sHtml = this.dotTemplate(this._templateParams());
      this.$el.append(sHtml);
      this.$el.addClass(this.baseClass + 'ItemWrapper');
      this.$el.addClass('dropdown');
      this.$toggle = this.$el.children('.dropdown-toggle');
      this.$toggle.addClass(this.baseClass + 'Icon');
      this.$iconImage = $('<span class="' + this.icon + '"></span>');

      if (this.icon) {
        this.$toggle.prepend(this.$iconImage);
      }

      this.$toggle.attr('title', this.label);
      this.$toggle.addClass(this.baseClass + 'Item');
      this.$menu = this.$el.children('.dropdown-menu');

      if (this.trailing) {
        this.$menu.addClass('dropdown-menu-right');
      }

      var promise = this._buildDropDown();

      this.$menuLabel = this.$el.find('.menu-label');
      return promise;
    },
    _buildDropDown: function _buildDropDown() {
      var deferred = $.Deferred();

      require(['bsdropdown'], function () {
        this.$toggle.dropdown();
        /**
         * A callback can be passed to opening behavior
         */

        if (this.action) {
          this.$el.on('show.bs.dropdown', this.action.bind(this));
        }

        this._buildMenuItems();

        deferred.resolve(this.$el);
      }.bind(this));

      return deferred.promise();
    },
    _buildMenuItems: function _buildMenuItems() {
      _.each(this.items, function (item) {
        this._buildMenuItem(item);
      }.bind(this));
    },
    _getItemId: function _getItemId(name) {
      return this.viewId + '_' + name;
    },
    _buildMenuItem: function _buildMenuItem(item) {
      var itemID = this._getItemId(item.name);

      this.itemActions[itemID] = item.action;
      var itemNode = $('#' + itemID);
      var elem = itemNode.get(0);

      if (elem) {
        bidi.initElementForBidi(elem);
      }
    }
  });
  return MenuItem;
});