/*
* 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);