/*
 * jQuery UI Accordion 1.6
 * 
 * Copyright (c) 2007 Jörn Zaefferer
 *
 * http://docs.jquery.com/UI/Accordion
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.accordion.js 4876 2008-03-08 11:49:04Z joern.zaefferer $
 *
 */
;(function($) {
 
// If the UI scope is not available, add it
$.ui = $.ui || {};
$.fn.extend({
 accordion: function(options, data) {
  var args = Array.prototype.slice.call(arguments, 1);
  return this.each(function() {
   if (typeof options == "string") {
    var accordion = $.data(this, "ui-accordion");
    accordion[options].apply(accordion, args);
   // INIT with optional options
   } else if (!$(this).is(".ui-accordion"))
    $.data(this, "ui-accordion", new $.ui.accordion(this, options));
  });
 },
 // deprecated, use accordion("activate", index) instead
 activate: function(index) {
  return this.accordion("activate", index);
 }
});
$.ui.accordion = function(container, options) {
 
 // setup configuration
 this.options = options = $.extend({}, $.ui.accordion.defaults, options);
 this.element = container;
 
 $(container).addClass("ui-accordion");
 
 if ( options.navigation ) {
  var current = $(container).find("a").filter(options.navigationFilter);
  if ( current.length ) {
   if ( current.filter(options.header).length ) {
    options.active = current;
   } else {
    options.active = current.parent().parent().prev();
    current.addClass("current");
   }
  }
 }
 
 // calculate active if not specified, using the first header
 options.headers = $(container).find(options.header);
 options.active = findActive(options.headers, options.active);
 if ( options.fillSpace ) {
  var maxHeight = $(container).parent().height();
  options.headers.each(function() {
   maxHeight -= $(this).outerHeight();
  });
  var maxPadding = 0;
  options.headers.next().each(function() {
   maxPadding = Math.max(maxPadding, $(this).innerHeight() - $(this).height());
  }).height(maxHeight - maxPadding);
 } else if ( options.autoheight ) {
  var maxHeight = 0;
  options.headers.next().each(function() {
   maxHeight = Math.max(maxHeight, $(this).outerHeight());
  }).height(maxHeight);
 }
 options.headers
  .not(options.active || "")
  .next()
  .hide();
 options.active.parent().andSelf().addClass(options.selectedClass);
 
 if (options.event)
  $(container).bind((options.event) + ".ui-accordion", clickHandler);
};
$.ui.accordion.prototype = {
 activate: function(index) {
  // call clickHandler with custom event
  clickHandler.call(this.element, {
   target: findActive( this.options.headers, index )[0]
  });
 },
 
 enable: function() {
  this.options.disabled = false;
 },
 disable: function() {
  this.options.disabled = true;
 },
 destroy: function() {
  this.options.headers.next().css("display", "");
  if ( this.options.fillSpace || this.options.autoheight ) {
   this.options.headers.next().css("height", "");
  }
  $.removeData(this.element, "ui-accordion");
  $(this.element).removeClass("ui-accordion").unbind(".ui-accordion");
 }
}
function scopeCallback(callback, scope) {
 return function() {
  return callback.apply(scope, arguments);
 };
}
function completed(cancel) {
 // if removed while animated data can be empty
 if (!$.data(this, "ui-accordion"))
  return;
 var instance = $.data(this, "ui-accordion");
 var options = instance.options;
 options.running = cancel ? 0 : --options.running;
 if ( options.running )
  return;
 if ( options.clearStyle ) {
  options.toShow.add(options.toHide).css({
   height: "",
   overflow: ""
  });
 }
 $(this).triggerHandler("change.ui-accordion", [options.data], options.change);
}
function toggle(toShow, toHide, data, clickedActive, down) {
 var options = $.data(this, "ui-accordion").options;
 options.toShow = toShow;
 options.toHide = toHide;
 options.data = data;
 var complete = scopeCallback(completed, this);
 
 // count elements to animate
 options.running = toHide.size() == 0 ? toShow.size() : toHide.size();
 
 if ( options.animated ) {
  if ( !options.alwaysOpen && clickedActive ) {
   $.ui.accordion.animations[options.animated]({
    toShow: jQuery([]),
    toHide: toHide,
    complete: complete,
    down: down,
    autoheight: options.autoheight
   });
  } else {
   $.ui.accordion.animations[options.animated]({
    toShow: toShow,
    toHide: toHide,
    complete: complete,
    down: down,
    autoheight: options.autoheight
   });
  }
 } else {
  if ( !options.alwaysOpen && clickedActive ) {
   toShow.toggle();
  } else {
   toHide.hide();
   toShow.show();
  }
  complete(true);
 }
}
function clickHandler(event) {
 var options = $.data(this, "ui-accordion").options;
 if (options.disabled)
  return false;
 
 // called only when using activate(false) to close all parts programmatically
 if ( !event.target && !options.alwaysOpen ) {
  options.active.parent().andSelf().toggleClass(options.selectedClass);
  var toHide = options.active.next(),
   data = {
    instance: this,
    options: options,
    newHeader: jQuery([]),
    oldHeader: options.active,
    newContent: jQuery([]),
    oldContent: toHide
   },
   toShow = options.active = $([]);
  toggle.call(this, toShow, toHide, data );
  return false;
 }
 // get the click target
 var clicked = $(event.target);
 
 // due to the event delegation model, we have to check if one
 // of the parent elements is our actual header, and find that
 if ( clicked.parents(options.header).length )
  while ( !clicked.is(options.header) )
   clicked = clicked.parent();
 
 var clickedActive = clicked[0] == options.active[0];
 
 // if animations are still active, or the active header is the target, ignore click
 if (options.running || (options.alwaysOpen && clickedActive))
  return false;
 if (!clicked.is(options.header))
  return;
 // switch classes
 options.active.parent().andSelf().toggleClass(options.selectedClass);
 if ( !clickedActive ) {
  clicked.parent().andSelf().addClass(options.selectedClass);
 }
 // find elements to show and hide
 var toShow = clicked.next(),
  toHide = options.active.next(),
  //data = [clicked, options.active, toShow, toHide],
  data = {
   instance: this,
   options: options,
   newHeader: clicked,
   oldHeader: options.active,
   newContent: toShow,
   oldContent: toHide
  },
  down = options.headers.index( options.active[0] ) > options.headers.index( clicked[0] );
 
 options.active = clickedActive ? $([]) : clicked;
 toggle.call(this, toShow, toHide, data, clickedActive, down );
 return false;
};
function findActive(headers, selector) {
 return selector != undefined
  ? typeof selector == "number"
   ? headers.filter(":eq(" + selector + ")")
   : headers.not(headers.not(selector))
  : selector === false
   ? $([])
   : headers.filter(":eq(0)");
}
$.extend($.ui.accordion, {
 defaults: {
  selectedClass: "selected",
  alwaysOpen: true,
  animated: 'slide',
  event: "click",
  header: "a",
  autoheight: true,
  running: 0,
  navigationFilter: function() {
   return this.href.toLowerCase() == location.href.toLowerCase();
  }
 },
 animations: {
  slide: function(options, additions) {
   options = $.extend({
    easing: "swing",
    duration: 300
   }, options, additions);
   if ( !options.toHide.size() ) {
    options.toShow.animate({height: "show"}, options);
    return;
   }
   var hideHeight = options.toHide.height(),
    showHeight = options.toShow.height(),
    difference = showHeight / hideHeight;
   options.toShow.css({ height: 0, overflow: 'hidden' }).show();
   options.toHide.filter(":hidden").each(options.complete).end().filter(":visible").animate({height:"hide"},{
    step: function(now) {
     var current = (hideHeight - now) * difference;
     if ($.browser.msie || $.browser.opera) {
      current = Math.ceil(current);
     }
     options.toShow.height( current );
    },
    duration: options.duration,
    easing: options.easing,
    complete: function() {
     if ( !options.autoheight ) {
      options.toShow.css("height", "auto");
     }
     options.complete();
    }
   });
  },
  bounceslide: function(options) {
   this.slide(options, {
    easing: options.down ? "bounceout" : "swing",
    duration: options.down ? 1000 : 200
   });
  },
  easeslide: function(options) {
   this.slide(options, {
    easing: "easeinout",
    duration: 700
   })
  }
 }
});
})(jQuery);