/*
 * jQuery UI Accordion
 *
 * 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 5048 2008-03-17 09:23:12Z 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 = $.data(this, "accordion");
 if (accordion)
 accordion[options].apply(accordion, args);
 // INIT with optional options
 } else if (!$(this).is(".ui-accordion"))
 $.data(this, "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) + ".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, "accordion");
 $(this.element).removeClass("ui-accordion").unbind(".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, "accordion"))
 return;
 var instance = $.data(this, "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("accordionchange", [options.data], options.change);
}

function toggle(toShow, toHide, data, clickedActive, down) {
 var options = $.data(this, "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, "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);