/* ========================================================================

 * Bootstrap: dropdown.js v3.0.0

 * http://twbs.github.com/bootstrap/javascript.html#dropdowns

 * ========================================================================

 * Copyright 2012 Twitter, Inc.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 * ======================================================================== */

+function ($) { "use strict";

  // DROPDOWN CLASS DEFINITION

  // =========================

  var backdrop = '.dropdown-backdrop'

  var toggle   = '[data-toggle=dropdown]'

  var Dropdown = function (element) {

    var $el = $(element).on('click.bs.dropdown', this.toggle)

  }

  Dropdown.prototype.toggle = function (e) {

    var $this = $(this)

    if ($this.is('.disabled, :disabled')) return

    var $parent  = getParent($this)

    var isActive = $parent.hasClass('open')

    clearMenus()

    if (!isActive) {

      if ('ontouchstart' in document.documentElement && !$parent.closest('.navbar-nav').length) {

        // if mobile we we use a backdrop because click events don't delegate

        $('<div class="dropdown-backdrop"/>').insertAfter($(this)).on('click', clearMenus)

      }

      $parent.trigger(e = $.Event('show.bs.dropdown'))

      if (e.isDefaultPrevented()) return

      $parent

        .toggleClass('open')

        .trigger('shown.bs.dropdown')

      $this.focus()

    }

    return false

  }

  Dropdown.prototype.keydown = function (e) {

    if (!/(38|40|27)/.test(e.keyCode)) return

    var $this = $(this)

    e.preventDefault()

    e.stopPropagation()

    if ($this.is('.disabled, :disabled')) return

    var $parent  = getParent($this)

    var isActive = $parent.hasClass('open')

    if (!isActive || (isActive && e.keyCode == 27)) {

      if (e.which == 27) $parent.find(toggle).focus()

      return $this.click()

    }

    var $items = $('[role=menu] li:not(.divider):visible a', $parent)

    if (!$items.length) return

    var index = $items.index($items.filter(':focus'))

    if (e.keyCode == 38 && index > 0)                 index--                        // up

    if (e.keyCode == 40 && index < $items.length - 1) index++                        // down

    if (!~index)                                      index=0

    $items.eq(index).focus()

  }

  function clearMenus() {

    $(backdrop).remove()

    $(toggle).each(function (e) {

      var $parent = getParent($(this))

      if (!$parent.hasClass('open')) return

      $parent.trigger(e = $.Event('hide.bs.dropdown'))

      if (e.isDefaultPrevented()) return

      $parent.removeClass('open').trigger('hidden.bs.dropdown')

    })

  }

  function getParent($this) {

    var selector = $this.attr('data-target')

    if (!selector) {

      selector = $this.attr('href')

      selector = selector && /#/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') //strip for ie7

    }

    var $parent = selector && $(selector)

    return $parent && $parent.length ? $parent : $this.parent()

  }

  // DROPDOWN PLUGIN DEFINITION

  // ==========================

  var old = $.fn.dropdown

  $.fn.dropdown = function (option) {

    return this.each(function () {

      var $this = $(this)

      var data  = $this.data('dropdown')

      if (!data) $this.data('dropdown', (data = new Dropdown(this)))

      if (typeof option == 'string') data[option].call($this)

    })

  }

  $.fn.dropdown.Constructor = Dropdown

  // DROPDOWN NO CONFLICT

  // ====================

  $.fn.dropdown.noConflict = function () {

    $.fn.dropdown = old

    return this

  }

  // APPLY TO STANDARD DROPDOWN ELEMENTS

  // ===================================

  $(document)

    .on('click.bs.dropdown.data-api', clearMenus)

    .on('click.bs.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })

    .on('click.bs.dropdown.data-api'  , toggle, Dropdown.prototype.toggle)

    .on('keydown.bs.dropdown.data-api', toggle + ', [role=menu]' , Dropdown.prototype.keydown)

}(window.jQuery);