/*
 * jQuery UI Tabs
 *
 * Copyright (c) 2007, 2008 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Tabs
 *
 * Depends:
 *	ui.core.js
 *
 */
(function($) {

		$.widget("ui.tabs", {
			init: function() {
				this.options.event += '.tabs'; // namespace event

				// create tabs
				this.tabify(true);
			},
			setData: function(key, value) {
				if ((/^selected/).test(key))
					this.select(value);
				else {
					this.options[key] = value;
					this.tabify();
				}
			},
			length: function() {
				return this.$tabs.length;
			},
			tabId: function(a) {
				return a.title && a.title.replace(/\s/g, '_').replace(/[^A-Za-z0-9\-_:\.]/g, '')
			|| this.options.idPrefix + $.data(a);
			},
			ui: function(tab, panel) {
				return {
					options: this.options,
					tab: tab,
					panel: panel
				};
			},
			tabify: function(init) {

				this.$lis = $('li:has(a[href])', this.element);
				this.$tabs = this.$lis.map(function() { return $('a', this)[0]; });
				this.$panels = $([]);

				var self = this, o = this.options;

				this.$tabs.each(function(i, a) {
					// inline tab
					if (a.hash && a.hash.replace('#', '')) // Safari 2 reports '#' for an empty hash
						self.$panels = self.$panels.add(a.hash);
					// remote tab
					else if ($(a).attr('href') != '#') { // prevent loading the page itself if href is just "#"
						$.data(a, 'href.tabs', a.href); // required for restore on destroy
						$.data(a, 'load.tabs', a.href); // mutable
						var id = self.tabId(a);
						a.href = '#' + id;
						var $panel = $('#' + id);
						if (!$panel.length) {
							$panel = $(o.panelTemplate).attr('id', id).addClass(o.panelClass)
						.insertAfter(self.$panels[i - 1] || self.element);
							$panel.data('destroy.tabs', true);
						}
						self.$panels = self.$panels.add($panel);
					}
					// invalid tab href
					else
						o.disabled.push(i + 1);
				});

				if (init) {

					// attach necessary classes for styling if not present
					this.element.addClass(o.navClass);
					this.$panels.each(function() {
						var $this = $(this);
						$this.addClass(o.panelClass);
					});

					this.$lis.each(function() {
						$(this).addClass(o.liClass);
					});

					// Selected tab
					// use "selected" option or try to retrieve:
					// 1. from fragment identifier in url
					// 2. from cookie
					// 3. from selected class attribute on <li>
					if (o.selected === undefined) {
						if (location.hash) {
							this.$tabs.each(function(i, a) {
								if (a.hash == location.hash) {
									o.selected = i;
									// prevent page scroll to fragment
									if ($.browser.msie || $.browser.opera) { // && !o.remote
										var $toShow = $(location.hash), toShowId = $toShow.attr('id');
										$toShow.attr('id', '');
										setTimeout(function() {
											$toShow.attr('id', toShowId); // restore id
										}, 500);
									}
									scrollTo(0, 0);
									return false; // break
								}
							});
						}
						else if (o.cookie) {
							var index = parseInt($.cookie('ui-tabs' + $.data(self.element)), 10);
							if (index && self.$tabs[index])
								o.selected = index;
						}
						else if (self.$lis.filter('.' + o.selectedClass).length)
							o.selected = self.$lis.index(self.$lis.filter('.' + o.selectedClass)[0]);
					}
					o.selected = o.selected === null || o.selected !== undefined ? o.selected : 0; // first tab selected by default

					// Take disabling tabs via class attribute from HTML
					// into account and update option properly.
					// A selected tab cannot become disabled.
					o.disabled = $.unique(o.disabled.concat(
				$.map(this.$lis.filter('.' + o.disabledClass),
					function(n, i) { return self.$lis.index(n); })
			)).sort();
					if ($.inArray(o.selected, o.disabled) != -1)
						o.disabled.splice($.inArray(o.selected, o.disabled), 1);

					// highlight selected tab
					this.$panels.addClass(o.hideClass);
					this.$lis.removeClass(o.selectedClass);
					if (o.selected !== null) {
						this.$panels.eq(o.selected).show().removeClass(o.hideClass); // use show and remove class to show in any case no matter how it has been hidden before
						this.$lis.eq(o.selected).addClass(o.selectedClass);

						// seems to be expected behavior that the show callback is fired
						var onShow = function() {
							$(self.element).triggerHandler('tabsshow',
						[self.ui(self.$tabs[o.selected], self.$panels[o.selected])], o.show);
						};

						// load if remote tab
						if ($.data(this.$tabs[o.selected], 'load.tabs'))
							this.load(o.selected, onShow);
						// just trigger show event
						else
							onShow();

					}

					// clean up to avoid memory leaks in certain versions of IE 6
					$(window).bind('unload', function() {
						self.$tabs.unbind('.tabs');
						self.$lis = self.$tabs = self.$panels = null;
					});

				}

				// disable tabs
				for (var i = 0, li; li = this.$lis[i]; i++)
					$(li)[$.inArray(i, o.disabled) != -1 && !$(li).hasClass(o.selectedClass) ? 'addClass' : 'removeClass'](o.disabledClass);

				// reset cache if switching from cached to not cached
				if (o.cache === false)
					this.$tabs.removeData('cache.tabs');

				// set up animations
				var hideFx, showFx, baseFx = { 'min-width': 0, duration: 1 }, baseDuration = 'normal';
				if (o.fx && o.fx.constructor == Array)
					hideFx = o.fx[0] || baseFx, showFx = o.fx[1] || baseFx;
				else
					hideFx = showFx = o.fx || baseFx;

				// reset some styles to maintain print style sheets etc.
				var resetCSS = { display: '', overflow: '', height: '' };
				if (!$.browser.msie) // not in IE to prevent ClearType font issue
					resetCSS.opacity = '';

				// Hide a tab, animation prevents browser scrolling to fragment,
				// $show is optional.
				function hideTab(clicked, $hide, $show) {
					$hide.animate(hideFx, hideFx.duration || baseDuration, function() { //
						$hide.addClass(o.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
						if ($.browser.msie && hideFx.opacity)
							$hide[0].style.filter = '';
						if ($show)
							showTab(clicked, $show, $hide);
					});
				}

				// Show a tab, animation prevents browser scrolling to fragment,
				// $hide is optional.
				function showTab(clicked, $show, $hide) {
					if (showFx === baseFx)
						$show.css('display', 'block'); // prevent occasionally occuring flicker in Firefox cause by gap between showing and hiding the tab panels
					$show.animate(showFx, showFx.duration || baseDuration, function() {
						$show.removeClass(o.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
						if ($.browser.msie && showFx.opacity)
							$show[0].style.filter = '';

						// callback
						$(self.element).triggerHandler('tabsshow',
					[self.ui(clicked, $show[0])], o.show);

					});
				}

				// switch a tab
				function switchTab(clicked, $li, $hide, $show) {
					/*if (o.bookmarkable && trueClick) { // add to history only if true click occured, not a triggered click
					$.ajaxHistory.update(clicked.hash);
					}*/
					$li.addClass(o.selectedClass)
				.siblings().removeClass(o.selectedClass);
					hideTab(clicked, $hide, $show);
				}

				// attach tab event handler, unbind to avoid duplicates from former tabifying...
				this.$tabs.unbind('.tabs').bind(o.event, function() {

					//var trueClick = e.clientX; // add to history only if true click occured, not a triggered click
					var $li = $(this).parents('li:eq(0)'),
				$hide = self.$panels.filter(':visible'),
				$show = $(this.hash);

					// If tab is already selected and not unselectable or tab disabled or 
					// or is already loading or click callback returns false stop here.
					// Check if click handler returns false last so that it is not executed
					// for a disabled or loading tab!
					if (($li.hasClass(o.selectedClass) && !o.unselect)
				|| $li.hasClass(o.disabledClass)
				|| $(this).hasClass(o.loadingClass)
				|| $(self.element).triggerHandler('tabsselect', [self.ui(this, $show[0])], o.select) === false
				) {
						this.blur();
						return false;
					}

					self.options.selected = self.$tabs.index(this);

					// if tab may be closed
					if (o.unselect) {
						if ($li.hasClass(o.selectedClass)) {
							self.options.selected = null;
							$li.removeClass(o.selectedClass);
							self.$panels.stop();
							hideTab(this, $hide);
							this.blur();
							return false;
						} else if (!$hide.length) {
							self.$panels.stop();
							var a = this;
							self.load(self.$tabs.index(this), function() {
								$li.addClass(o.selectedClass).addClass(o.unselectClass);
								showTab(a, $show);
							});
							this.blur();
							return false;
						}
					}

					if (o.cookie)
						$.cookie('ui-tabs' + $.data(self.element), self.options.selected, o.cookie);

					// stop possibly running animations
					self.$panels.stop();

					// show new tab
					if ($show.length) {

						// prevent scrollbar scrolling to 0 and than back in IE7, happens only if bookmarking/history is enabled
						/*if ($.browser.msie && o.bookmarkable) {
						var showId = this.hash.replace('#', '');
						$show.attr('id', '');
						setTimeout(function() {
						$show.attr('id', showId); // restore id
						}, 0);
						}*/

						var a = this;
						self.load(self.$tabs.index(this), $hide.length ?
					function() {
							switchTab(a, $li, $hide, $show);
						} :
					function() {
							$li.addClass(o.selectedClass);
							showTab(a, $show);
						}
				);

						// Set scrollbar to saved position - need to use timeout with 0 to prevent browser scroll to target of hash
						/*var scrollX = window.pageXOffset || document.documentElement && document.documentElement.scrollLeft || document.body.scrollLeft || 0;
						var scrollY = window.pageYOffset || document.documentElement && document.documentElement.scrollTop || document.body.scrollTop || 0;
						setTimeout(function() {
						scrollTo(scrollX, scrollY);
						}, 0);*/

					} else
						throw 'jQuery UI Tabs: Mismatching fragment identifier.';

					// Prevent IE from keeping other link focussed when using the back button
					// and remove dotted border from clicked link. This is controlled in modern
					// browsers via CSS, also blur removes focus from address bar in Firefox
					// which can become a usability and annoying problem with tabsRotate.
					if ($.browser.msie)
						this.blur();

					//return o.bookmarkable && !!trueClick; // convert trueClick == undefined to Boolean required in IE
					return false;

				});

				// disable click if event is configured to something else
				if (!(/^click/).test(o.event))
					this.$tabs.bind('click.tabs', function() { return false; });

			},
			add: function(url, label, index) {
				if (index == undefined)
					index = this.$tabs.length; // append by default

				var o = this.options;
				var $li = $(o.tabTemplate.replace(/#\{href\}/g, url).replace(/#\{label\}/g, label));
				$li.data('destroy.tabs', true);

				var id = url.indexOf('#') == 0 ? url.replace('#', '') : this.tabId($('a:first-child', $li)[0]);

				// try to find an existing element before creating a new one
				var $panel = $('#' + id);
				if (!$panel.length) {
					$panel = $(o.panelTemplate).attr('id', id)
				.addClass(o.hideClass)
				.data('destroy.tabs', true);
				}
				$panel.addClass(o.panelClass);
				if (index >= this.$lis.length) {
					$li.appendTo(this.element);
					$panel.appendTo(this.element[0].parentNode);
				} else {
					$li.insertBefore(this.$lis[index]);
					$panel.insertBefore(this.$panels[index]);
				}

				o.disabled = $.map(o.disabled,
			function(n, i) { return n >= index ? ++n : n });

				this.tabify();

				if (this.$tabs.length == 1) {
					$li.addClass(o.selectedClass);
					$panel.removeClass(o.hideClass);
					var href = $.data(this.$tabs[0], 'load.tabs');
					if (href)
						this.load(index, href);
				}

				// callback
				this.element.triggerHandler('tabsadd',
			[this.ui(this.$tabs[index], this.$panels[index])], o.add
		);
			},
			remove: function(index) {
				var o = this.options, $li = this.$lis.eq(index).remove(),
			$panel = this.$panels.eq(index).remove();

				// If selected tab was removed focus tab to the right or
				// in case the last tab was removed the tab to the left.
				if ($li.hasClass(o.selectedClass) && this.$tabs.length > 1)
					this.select(index + (index + 1 < this.$tabs.length ? 1 : -1));

				o.disabled = $.map($.grep(o.disabled, function(n, i) { return n != index; }),
			function(n, i) { return n >= index ? --n : n });

				this.tabify();

				// callback
				this.element.triggerHandler('tabsremove',
			[this.ui($li.find('a')[0], $panel[0])], o.remove
		);
			},
			enable: function(index) {
				var o = this.options;
				if ($.inArray(index, o.disabled) == -1)
					return;

				var $li = this.$lis.eq(index).removeClass(o.disabledClass);
				if ($.browser.safari) { // fix disappearing tab (that used opacity indicating disabling) after enabling in Safari 2...
					$li.css('display', 'inline-block');
					setTimeout(function() {
						$li.css('display', 'block');
					}, 0);
				}

				o.disabled = $.grep(o.disabled, function(n, i) { return n != index; });

				// callback
				this.element.triggerHandler('tabsenable',
			[this.ui(this.$tabs[index], this.$panels[index])], o.enable
		);

			},
			disable: function(index) {
				var self = this, o = this.options;
				if (index != o.selected) { // cannot disable already selected tab
					this.$lis.eq(index).addClass(o.disabledClass);

					o.disabled.push(index);
					o.disabled.sort();

					// callback
					this.element.triggerHandler('tabsdisable',
				[this.ui(this.$tabs[index], this.$panels[index])], o.disable
			);
				}
			},
			select: function(index) {
				if (typeof index == 'string')
					index = this.$tabs.index(this.$tabs.filter('[href$=' + index + ']')[0]);
				this.$tabs.eq(index).trigger(this.options.event);
			},
			load: function(index, callback) { // callback is for internal usage only

				var self = this, o = this.options, $a = this.$tabs.eq(index), a = $a[0],
				bypassCache = callback == undefined || callback === false, url = $a.data('load.tabs');

				callback = callback || function() { };

				// no remote or from cache - just finish with callback
				if (!url || !bypassCache && $.data(a, 'cache.tabs')) {
					callback();
					return;
				}

				// load remote from here on

				var inner = function(parent) {
					var $parent = $(parent), $inner = $parent.find('*:last');
					return $inner.length && $inner || $parent;
				};
				var cleanup = function() {
					self.$tabs.filter('.' + o.loadingClass).removeClass(o.loadingClass)
						.each(function() {
						if (o.spinner)
							inner(this).parent().html(inner(this).data('label.tabs'));
					});
					self.xhr = null;
				};

				if (o.spinner) {
					var label = inner(a).html();
					inner(a).wrapInner('<em></em>')
				.find('em').data('label.tabs', label).html(o.spinner);
				}

				var ajaxOptions = $.extend({}, o.ajaxOptions, {
					url: url,
					success: function(r, s) {
						$(a.hash).html(r);
						cleanup();

						if (o.cache)
							$.data(a, 'cache.tabs', true); // if loaded once do not load them again

						// callbacks
						$(self.element).triggerHandler('tabsload',
					[self.ui(self.$tabs[index], self.$panels[index])], o.load
				);
						o.ajaxOptions.success && o.ajaxOptions.success(r, s);

						// This callback is required because the switch has to take
						// place after loading has completed. Call last in order to 
						// fire load before show callback...
						callback();
					}
				});
				if (this.xhr) {
					// terminate pending requests from other tabs and restore tab label
					this.xhr.abort();
					cleanup();
				}
				$a.addClass(o.loadingClass);
				setTimeout(function() { // timeout is again required in IE, "wait" for id being restored
					self.xhr = $.ajax(ajaxOptions);
				}, 0);

			},
			url: function(index, url) {
				this.$tabs.eq(index).removeData('cache.tabs').data('load.tabs', url);
			},
			destroy: function() {
				var o = this.options;
				this.element.unbind('.tabs')
			.removeClass(o.navClass).removeData('tabs');
				this.$tabs.each(function() {
					var href = $.data(this, 'href.tabs');
					if (href)
						this.href = href;
					var $this = $(this).unbind('.tabs');
					$.each(['href', 'load', 'cache'], function(i, prefix) {
						$this.removeData(prefix + '.tabs');
					});
				});
				this.$lis.add(this.$panels).each(function() {
					if ($.data(this, 'destroy.tabs'))
						$(this).remove();
					else
						$(this).removeClass([o.selectedClass, o.unselectClass,
					o.disabledClass, o.panelClass, o.hideClass].join(' '));
				});
			}
		});

		$.ui.tabs.defaults = {
			// basic setup
			unselect: false,
			event: 'click',
			disabled: [],
			cookie: null, // e.g. { expires: 7, path: '/', domain: 'jquery.com', secure: true }
			// TODO history: false,

			// Ajax
			spinner: 'Loading&#8230;',
			cache: false,
			idPrefix: 'ui-tabs-',
			ajaxOptions: {},

			// animations
			fx: null, // e.g. { height: 'toggle', opacity: 'toggle', duration: 200 }

			// templates
			tabTemplate: '<li><a href="#{href}"><span>#{label}</span></a></li>',
			panelTemplate: '<div></div>',

			// CSS classes
			navClass: 'ui-tabs-nav',
			liClass: 'ui-tabs-nav-item',
			selectedClass: 'ui-tabs-selected',
			unselectClass: 'ui-tabs-unselect',
			disabledClass: 'ui-tabs-disabled',
			panelClass: 'ui-tabs-panel',
			hideClass: 'ui-tabs-hide',
			loadingClass: 'ui-tabs-loading'
		};

		$.ui.tabs.getter = "length";

		/*
		* Tabs Extensions
		*/

		/*
		* Rotate
		*/
		$.extend($.ui.tabs.prototype, {
			rotation: null,
			rotate: function(ms, continuing) {

				continuing = continuing || false;

				var self = this, t = this.options.selected;

				function start() {
					self.rotation = setInterval(function() {
						t = ++t < self.$tabs.length ? t : 0;
						self.select(t);
					}, ms);
				}

				function stop(e) {
					if (!e || e.clientX) { // only in case of a true click
						clearInterval(self.rotation);
					}
				}

				// start interval
				if (ms) {
					start();
					if (!continuing)
						this.$tabs.bind(this.options.event, stop);
					else
						this.$tabs.bind(this.options.event, function() {
						stop();
						t = self.options.selected;
						start();
					});
				}
				// stop interval
				else {
					stop();
					this.$tabs.unbind(this.options.event, stop);
				}
			}
		});

	})(jQuery);