/*!
 * bootstrap-submenu v2.0.4 (https://vsn4ik.github.io/bootstrap-submenu/)
 * copyright 2014-2016 vasily a. (https://github.com/vsn4ik)
 * licensed under the mit license
 */

/**
 * $.inarray: friends with ie8. use array.prototype.indexof in future.
 * $.proxy: friends with ie8. use function.prototype.bind in future.
 */

'use strict';

(function(factory) {
  if (typeof define == 'function' && define.amd) {
    // amd. register as an anonymous module
    define(['jquery'], factory);
  }
  else if (typeof exports == 'object') {
    // node/commonjs
    module.exports = factory(require('jquery'));
  }
  else {
    // browser globals
    factory(jquery);
  }
})(function($) {
  function item(element) {
    this.$element = $(element);
    this.$menu = this.$element.closest('.dropdown-menu');
    this.$main = this.$menu.parent();
    this.$items = this.$menu.children('.dropdown-submenu');

    this.init();
  }

  item.prototype = {
    init: function() {
      this.$element.on('keydown', $.proxy(this, 'keydown'));
    },
    close: function() {
      this.$main.removeclass('open');
      this.$items.trigger('hide.bs.submenu');
    },
    keydown: function(event) {
      // 27: esc

      if (event.keycode == 27) {
        event.stoppropagation();

        this.close();
        this.$main.children('a, button').trigger('focus');
      }
    }
  };

  function submenuitem(element) {
    this.$element = $(element);
    this.$main = this.$element.parent();
    this.$menu = this.$main.children('.dropdown-menu');
    this.$subs = this.$main.siblings('.dropdown-submenu');
    this.$items = this.$menu.children('.dropdown-submenu');

    this.init();
  }

  $.extend(submenuitem.prototype, item.prototype, {
    init: function() {
      this.$element.on({
        click: $.proxy(this, 'click'),
        keydown: $.proxy(this, 'keydown')
      });

      this.$main.on('hide.bs.submenu', $.proxy(this, 'hide'));
    },
    click: function(event) {
      // fix a[href="#"]. for community
      event.preventdefault();

      event.stoppropagation();

      this.toggle();
    },
    hide: function(event) {
      // stop event bubbling
      event.stoppropagation();

      this.close();
    },
    open: function() {
      this.$main.addclass('open');
      this.$subs.trigger('hide.bs.submenu');
    },
    toggle: function() {
      if (this.$main.hasclass('open')) {
        this.close();
      }
      else {
        this.open();
      }
    },
    keydown: function(event) {
      // 13: return, 32: spacebar

      if (event.keycode == 32) {
        // off vertical scrolling
        event.preventdefault();
      }

      if ($.inarray(event.keycode, [13, 32]) != -1) {
        this.toggle();
      }
    }
  });

  function submenupicker(element) {
    this.$element = $(element);
    this.$main = this.$element.parent();
    this.$menu = this.$main.children('.dropdown-menu');
    this.$items = this.$menu.children('.dropdown-submenu');

    this.init();
  }

  submenupicker.prototype = {
    init: function() {
      this.$menu.off('keydown.bs.dropdown.data-api');
      this.$menu.on('keydown', $.proxy(this, 'itemkeydown'));

      this.$menu.find('li > a').each(function() {
        new item(this);
      });

      this.$menu.find('.dropdown-submenu > a').each(function() {
        new submenuitem(this);
      });

      this.$main.on('hidden.bs.dropdown', $.proxy(this, 'hidden'));
    },
    hidden: function() {
      this.$items.trigger('hide.bs.submenu');
    },
    itemkeydown: function(event) {
      // 38: arrow up, 40: arrow down

      if ($.inarray(event.keycode, [38, 40]) != -1) {
        // off vertical scrolling
        event.preventdefault();

        event.stoppropagation();

        var $items = this.$menu.find('li:not(.disabled):visible > a');
        var index = $items.index(event.target);

        if (event.keycode == 38 && index !== 0) {
          index--;
        }
        else if (event.keycode == 40 && index !== $items.length - 1) {
          index++;
        }
        else {
          return;
        }

        $items.eq(index).trigger('focus');
      }
    }
  };

  var old = $.fn.submenupicker;

  // for amd/node/commonjs used elements (optional)
  // http://learn.jquery.com/jquery-ui/environments/amd/
  $.fn.submenupicker = function(elements) {
    var $elements = this instanceof $ ? this : $(elements);

    return $elements.each(function() {
      var data = $.data(this, 'bs.submenu');

      if (!data) {
        data = new submenupicker(this);

        $.data(this, 'bs.submenu', data);
      }
    });
  };

  $.fn.submenupicker.constructor = submenupicker;
  $.fn.submenupicker.noconflict = function() {
    $.fn.submenupicker = old;
    return this;
  };

  return $.fn.submenupicker;
});