/*
 * jQuery UI Accordion @VERSION
 *
 * Copyright (c) 2009 AUTHORS.txt (http://ui.jquery.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Accordion
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

$.widget("ui.accordion", {

	_init: function() {

		var o = this.options, self = this;
		this.running = 0;

		if ( o.navigation ) {
			var current = this.element.find("a").filter(o.navigationFilter);
			if ( current.length ) {
				if ( current.filter(o.header).length ) {
					this.active = current;
				} else {
					this.active = current.parent().parent().prev();
					current.addClass("ui-accordion-current");
				}
			}
		}

		this.element.addClass("ui-accordion ui-widget ui-helper-reset");

		this.groups = this.element.children().addClass("ui-accordion-group");
		this.headers = this.groups.find("> :first-child").addClass("ui-accordion-header ui-helper-reset ui-state-default ui-corner-all")
			.bind("mouseenter.accordion", function(){ $(this).addClass('ui-state-hover'); })
			.bind("mouseleave.accordion", function(){ $(this).removeClass('ui-state-hover'); });

		// wrap content elements in div against animation issues
		this.headers
			.next()
				.wrap("<div></div>")
				.addClass("ui-accordion-content")
				.parent()
					.addClass("ui-accordion-content-wrap ui-helper-reset ui-widget-content ui-corner-bottom");

		this.active = this._findActive(this.active || o.active).toggleClass("ui-state-default").toggleClass("ui-state-active").toggleClass("ui-corner-all").toggleClass("ui-corner-top");
		this.active.parent().addClass('ui-accordion-selected');

		//Append icon elements
		$("<span/>").addClass("ui-icon " + o.icons.header).prependTo(this.headers);
		this.active.find(".ui-icon").toggleClass(o.icons.header).toggleClass(o.icons.headerSelected);

		// IE7-/Win - Extra vertical space in lists fixed
		if ($.browser.msie) {
			this.element.find('a').css('zoom', '1');
		}

		this.resize();

		//ARIA
		this.element.attr('role','tablist');

		this.headers
			.attr('role','tab')
			.bind('keydown', function(event) { return self._keydown(event); })
			.next()
			.attr('role','tabpanel');

		this.headers
			.not(this.active || "")
			.attr('aria-expanded','false')
			.attr("tabIndex", "-1")
			.next()
			.hide();

		// make sure at least one header is in the tab order
		if (!this.active.length) {
			this.headers.eq(0).attr('tabIndex','0');
		} else {
			this.active
				.attr('aria-expanded','true')
				.attr('tabIndex', '0');
		}

		// only need links in taborder for Safari
		if (!$.browser.safari)
			this.headers.find('a').attr('tabIndex','-1');

		if (o.event) {
			this.element.bind((o.event) + ".accordion", function(event) { return self._clickHandler.call(self, event); });
		}

	},

	destroy: function() {

		this.element
			.removeClass("ui-accordion ui-widget ui-helper-reset")
			.removeAttr("role")
			.unbind('.accordion')
			.removeData('accordion');

		this.element.children().removeClass("ui-accordion-group ui-accordion-selected");
		this.headers
			.unbind(".accordion")
			.removeClass("ui-accordion-header ui-helper-reset ui-state-default ui-corner-all ui-state-active ui-corner-top")
			.removeAttr("role").removeAttr("aria-expanded").removeAttr("tabindex");

		this.headers.find("a").removeAttr("tabindex");
		this.headers.children(".ui-icon").remove();
		this.headers.next().children().removeClass("ui-accordion-content").each(function() {
			$(this).parent().replaceWith(this);
		});

	},

	_keydown: function(event) {

		var o = this.options, keyCode = $.ui.keyCode;

		if (o.disabled || event.altKey || event.ctrlKey)
			return;

		var length = this.headers.length;
		var currentIndex = this.headers.index(event.target);
		var toFocus = false;

		switch(event.keyCode) {
			case keyCode.RIGHT:
			case keyCode.DOWN:
				toFocus = this.headers[(currentIndex + 1) % length];
				break;
			case keyCode.LEFT:
			case keyCode.UP:
				toFocus = this.headers[(currentIndex - 1 + length) % length];
				break;
			case keyCode.SPACE:
			case keyCode.ENTER:
				return this._clickHandler({ target: event.target });
		}

		if (toFocus) {
			$(event.target).attr('tabIndex','-1');
			$(toFocus).attr('tabIndex','0');
			toFocus.focus();
			return false;
		}

		return true;

	},

	resize: function() {

		var o = this.options, maxHeight;

		if (o.fillSpace) {
			
			if($.browser.msie) { var defOverflow = this.element.parent().css('overflow'); this.element.parent().css('overflow', 'hidden'); }
			maxHeight = this.element.parent().height();
			if($.browser.msie) { this.element.parent().css('overflow', defOverflow); }
	
			this.headers.each(function() {
				maxHeight -= $(this).outerHeight();
			});

			var maxPadding = 0;
			this.headers.next().each(function() {
				maxPadding = Math.max(maxPadding, $(this).innerHeight() - $(this).height());
			}).height(maxHeight - maxPadding)
			.css('overflow', 'auto');

		} else if ( o.autoHeight ) {
			maxHeight = 0;
			this.headers.next().each(function() {
				maxHeight = Math.max(maxHeight, $(this).outerHeight());
			}).height(maxHeight);
		}

	},

	activate: function(index) {
		// call clickHandler with custom event
		this._clickHandler({ target: this._findActive(index)[0] });
	},

	_findActive: function(selector) {
		return selector
			? typeof selector == "number"
				? this.headers.filter(":eq(" + selector + ")")
				: this.headers.not(this.headers.not(selector))
			: selector === false
				? $([])
				: this.headers.filter(":eq(0)");
	},

	_clickHandler: function(event) {

		var o = this.options;
		if (o.disabled) return false;

		// called only when using activate(false) to close all parts programmatically
		if (!event.target && !o.alwaysOpen) {
			this.active.parent().toggleClass('ui-accordion-selected');
			this.active.removeClass("ui-state-active ui-corner-top").addClass("ui-state-default ui-corner-all")
				.find(".ui-icon").removeClass(o.icons.headerSelected).addClass(o.icons.header);
			var toHide = this.active.next(),
				data = {
					options: o,
					newHeader: $([]),
					oldHeader: o.active,
					newContent: $([]),
					oldContent: toHide
				},
				toShow = (this.active = $([]));
			this._toggle(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
		// otherwise stick with the initial target
		clicked = $( clicked.parents(o.header)[0] || clicked );
		var clickedIsActive = clicked[0] == this.active[0];

		// if animations are still active, or the active header is the target, ignore click
		if (this.running || (o.alwaysOpen && clickedIsActive)) {
			return false;
		}
		if (!clicked.is(o.header)) {
			return;
		}

		// switch classes
		this.active.parent().toggleClass('ui-accordion-selected');
		this.active.removeClass("ui-state-active ui-corner-top").addClass("ui-state-default ui-corner-all")
			.find(".ui-icon").removeClass(o.icons.headerSelected).addClass(o.icons.header);
		if (!clickedIsActive) {
			clicked.parent().addClass('ui-accordion-selected');
			clicked.removeClass("ui-state-default ui-corner-all").addClass("ui-state-active ui-corner-top")
				.find(".ui-icon").removeClass(o.icons.header).addClass(o.icons.headerSelected);
		}

		// find elements to show and hide
		var toShow = clicked.next(),
			toHide = this.active.next(),
			data = {
				options: o,
				newHeader: clickedIsActive && !o.alwaysOpen ? $([]) : clicked,
				oldHeader: this.active,
				newContent: clickedIsActive && !o.alwaysOpen ? $([]) : toShow.find('> *'),
				oldContent: toHide.find('> *')
			},
			down = this.headers.index( this.active[0] ) > this.headers.index( clicked[0] );

		this.active = clickedIsActive ? $([]) : clicked;
		this._toggle(toShow, toHide, data, clickedIsActive, down);

		return false;

	},

	_toggle: function(toShow, toHide, data, clickedIsActive, down) {

		var o = this.options, self = this;

		this.toShow = toShow;
		this.toHide = toHide;
		this.data = data;

		var complete = function() { if(!self) return; return self._completed.apply(self, arguments); };

		// trigger changestart event
		this._trigger("changestart", null, this.data);

		// count elements to animate
		this.running = toHide.size() === 0 ? toShow.size() : toHide.size();

		if (o.animated) {

			var animOptions = {};

			if ( !o.alwaysOpen && clickedIsActive ) {
				animOptions = {
					toShow: $([]),
					toHide: toHide,
					complete: complete,
					down: down,
					autoHeight: o.autoHeight || o.fillSpace
				};
			} else {
				animOptions = {
					toShow: toShow,
					toHide: toHide,
					complete: complete,
					down: down,
					autoHeight: o.autoHeight || o.fillSpace
				};
			}

			if (!o.proxied) {
				o.proxied = o.animated;
			}

			if (!o.proxiedDuration) {
				o.proxiedDuration = o.duration;
			}

			o.animated = $.isFunction(o.proxied) ?
				o.proxied(animOptions) : o.proxied;

			o.duration = $.isFunction(o.proxiedDuration) ?
				o.proxiedDuration(animOptions) : o.proxiedDuration;

			var animations = $.ui.accordion.animations,
				duration = o.duration,
				easing = o.animated;

			if (!animations[easing]) {
				animations[easing] = function(options) {
					this.slide(options, {
						easing: easing,
						duration: duration || 700
					});
				};
			}

			animations[easing](animOptions);

		} else {

			if (!o.alwaysOpen && clickedIsActive) {
				toShow.toggle();
			} else {
				toHide.hide();
				toShow.show();
			}

			complete(true);

		}

		toHide.prev().attr('aria-expanded','false').attr("tabIndex", "-1");
		toShow.prev().attr('aria-expanded','true').attr("tabIndex", "0").focus();

	},

	_completed: function(cancel) {

		var o = this.options;

		this.running = cancel ? 0 : --this.running;
		if (this.running) return;

		if (o.clearStyle) {
			this.toShow.add(this.toHide).css({
				height: "",
				overflow: ""
			});
		}

		this._trigger('change', null, this.data);

	}

});


$.extend($.ui.accordion, {
	version: "@VERSION",
	defaults: {
		active: null,
		autoHeight: true,
		alwaysOpen: true,
		animated: 'slide',
		clearStyle: false,
		event: "click",
		fillSpace: false,
		header: "a",
		icons: {
			header: "ui-icon-triangle-1-e",
			headerSelected: "ui-icon-triangle-1-s"
		},
		navigation: false,
		navigationFilter: function() {
			return this.href.toLowerCase() == location.href.toLowerCase();
		}
	},
	animations: {
		slide: function(options, additions) {
			options = $.extend({
				easing: "swing",
				duration: 300
			}, options, additions);
			if ( !options.toHide.size() ) {
				options.toShow.animate({height: "show"}, options);
				return;
			}
			var hideHeight = options.toHide.height(),
				showHeight = options.toShow.height(),
				difference = showHeight / hideHeight,
				overflow = options.toShow.css('overflow');
			options.toShow.css({ height: 0, overflow: 'hidden' }).show();
			options.toHide.filter(":hidden").each(options.complete).end().filter(":visible").animate({height:"hide"},{
				step: function(now) {
					var current = (hideHeight - now) * difference;
					if ($.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.toShow.css({overflow: overflow});
					options.complete();
				}
			});
		},
		bounceslide: function(options) {
			this.slide(options, {
				easing: options.down ? "easeOutBounce" : "swing",
				duration: options.down ? 1000 : 200
			});
		},
		easeslide: function(options) {
			this.slide(options, {
				easing: "easeinout",
				duration: 700
			});
		}
	}
});

})(jQuery);