/* =============================================================
 * bootstrap-collapse.js v2.0.0
 * http://twitter.github.com/bootstrap/javascript.html#collapse
 * =============================================================
 * 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"

  var Collapse = function ( element, options ) {
  	this.$element = $(element)
    this.options = $.extend({}, $.fn.collapse.defaults, options)

    if (this.options["parent"]) {
      this.$parent = $(this.options["parent"])
    }

    this.options.toggle && this.toggle()
  }

  Collapse.prototype = {

    constructor: Collapse

  , dimension: function () {
      var hasWidth = this.$element.hasClass('width')
      return hasWidth ? 'width' : 'height'
    }

  , show: function () {
      var dimension = this.dimension()
        , scroll = $.camelCase(['scroll', dimension].join('-'))
        , actives = this.$parent && this.$parent.find('.in')
        , hasData

      if (actives && actives.length) {
        hasData = actives.data('collapse')
        actives.collapse('hide')
        hasData || actives.data('collapse', null)
      }

      this.$element[dimension](0)
      this.transition('addClass', 'show', 'shown')
      this.$element[dimension](this.$element[0][scroll])

    }

  , hide: function () {
      var dimension = this.dimension()
      this.reset(this.$element[dimension]())
      this.transition('removeClass', 'hide', 'hidden')
      this.$element[dimension](0)
    }

  , reset: function ( size ) {
      var dimension = this.dimension()

      this.$element
        .removeClass('collapse')
        [dimension](size || 'auto')
        [0].offsetWidth

      this.$element.addClass('collapse')
    }

  , transition: function ( method, startEvent, completeEvent ) {
      var that = this
        , complete = function () {
            if (startEvent == 'show') that.reset()
            that.$element.trigger(completeEvent)
          }

      this.$element
        .trigger(startEvent)
        [method]('in')

      $.support.transition && this.$element.hasClass('collapse') ?
        this.$element.one($.support.transition.end, complete) :
        complete()
  	}

  , toggle: function () {
      this[this.$element.hasClass('in') ? 'hide' : 'show']()
  	}

  }

  /* COLLAPSIBLE PLUGIN DEFINITION
  * ============================== */

  $.fn.collapse = function ( option ) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('collapse')
        , options = typeof option == 'object' && option
      if (!data) $this.data('collapse', (data = new Collapse(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }

  $.fn.collapse.defaults = {
    toggle: true
  }

  $.fn.collapse.Constructor = Collapse


 /* COLLAPSIBLE DATA-API
  * ==================== */

  $(function () {
    $('body').on('click.collapse.data-api', '[data-toggle=collapse]', function ( e ) {
      var $this = $(this), href
        , target = $this.attr('data-target')
          || e.preventDefault()
          || (href = $this.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '') //strip for ie7
        , option = $(target).data('collapse') ? 'toggle' : $this.data()
      $(target).collapse(option)
    })
  })

}( window.jQuery )
