/*
* jQuery UI Accordion 1.7.2
*
* Copyright (c) 2009 AUTHORS.txt (http://jqueryui.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 the user set the alwaysOpen option on init
			// then we need to set the collapsible option
			// if they set both on init, collapsible will take priority
			if (o.collapsible == $.ui.accordion.defaults.collapsible &&
			o.alwaysOpen != $.ui.accordion.defaults.alwaysOpen) {
				o.collapsible = !o.alwaysOpen;
			}

			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-content-active");
					}
				}
			}

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

			// in lack of child-selectors in CSS we need to mark top-LIs in a UL-accordion for some IE-fix
			if (this.element[0].nodeName == "UL") {
				this.element.children("li").addClass("ui-accordion-li-fix");
			}

			this.headers = this.element.find(o.header).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'); })
			.bind("focus.accordion", function() { $(this).addClass('ui-state-focus'); })
			.bind("blur.accordion", function() { $(this).removeClass('ui-state-focus'); });

			this.headers
			.next()
				.addClass("ui-accordion-content 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.next().addClass('ui-accordion-content-active');

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

		},

		destroy: function() {
			var o = this.options;

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

			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();
			var contents = this.headers.next().css("display", "").removeAttr("role").removeClass("ui-helper-reset ui-widget-content ui-corner-bottom ui-accordion-content ui-accordion-content-active");
			if (o.autoHeight || o.fillHeight) {
				contents.css("height", "");
			}
		},

		_setData: function(key, value) {
			if (key == 'alwaysOpen') { key = 'collapsible'; value = !value; }
			$.widget.prototype._setData.apply(this, arguments);
		},

		_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 }, 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(Math.max(0, 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
			var active = this._findActive(index)[0];
			this._clickHandler({ target: active }, active);
		},

		_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, target) {

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

			// called only when using activate(false) to close all parts programmatically
			if (!event.target && o.collapsible) {
				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);
				this.active.next().addClass('ui-accordion-content-active');
				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.currentTarget || target);
			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.collapsible && clickedIsActive)) {
				return false;
			}

			// switch classes
			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);
			this.active.next().addClass('ui-accordion-content-active');
			if (!clickedIsActive) {
				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);
				clicked.next().addClass('ui-accordion-content-active');
			}

			// find elements to show and hide
			var toShow = clicked.next(),
			toHide = this.active.next(),
			data = {
				options: o,
				newHeader: clickedIsActive && o.collapsible ? $([]) : clicked,
				oldHeader: this.active,
				newContent: clickedIsActive && o.collapsible ? $([]) : 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.collapsible && 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.collapsible && clickedIsActive) {
					toShow.toggle();
				} else {
					toHide.hide();
					toShow.show();
				}

				complete(true);

			}

			toHide.prev().attr('aria-expanded', 'false').attr("tabIndex", "-1").blur();
			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: "1.7.2",
		defaults: {
			active: null,
			alwaysOpen: true, //deprecated, use collapsible
			animated: 'slide',
			autoHeight: true,
			clearStyle: false,
			collapsible: false,
			event: "click",
			fillSpace: false,
			header: "> li > :first-child,> :not(li):even",
			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;
				}
				if (!options.toShow.size()) {
					options.toHide.animate({ height: "hide" }, options);
					return;
				}
				var overflow = options.toShow.css('overflow'),
				percentDone,
				showProps = {},
				hideProps = {},
				fxAttrs = ["height", "paddingTop", "paddingBottom"],
				originalWidth;
				// fix width before calculating height of hidden element
				var s = options.toShow;
				originalWidth = s[0].style.width;
				s.width(parseInt(s.parent().width(), 10) - parseInt(s.css("paddingLeft"), 10) - parseInt(s.css("paddingRight"), 10) - (parseInt(s.css("borderLeftWidth"), 10) || 0) - (parseInt(s.css("borderRightWidth"), 10) || 0));

				$.each(fxAttrs, function(i, prop) {
					hideProps[prop] = 'hide';

					var parts = ('' + $.css(options.toShow[0], prop)).match(/^([\d+-.]+)(.*)$/);
					showProps[prop] = {
						value: parts[1],
						unit: parts[2] || 'px'
					};
				});
				options.toShow.css({ height: 0, overflow: 'hidden' }).show();
				options.toHide.filter(":hidden").each(options.complete).end().filter(":visible").animate(hideProps, {
					step: function(now, settings) {
						// only calculate the percent when animating height
						// IE gets very inconsistent results when animating elements
						// with small values, which is common for padding
						if (settings.prop == 'height') {
							percentDone = (settings.now - settings.start) / (settings.end - settings.start);
						}

						options.toShow[0].style[settings.prop] =
						(percentDone * showProps[settings.prop].value) + showProps[settings.prop].unit;
					},
					duration: options.duration,
					easing: options.easing,
					complete: function() {
						if (!options.autoHeight) {
							options.toShow.css("height", "");
						}
						options.toShow.css("width", originalWidth);
						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);