/*
 * Tabs 3 - New Wave Tabs
 *
 * Copyright (c) 2007 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 */

(function($) {

	// if the UI scope is not availalable, add it
	$.ui = $.ui || {};

	// tabs initialization
	$.fn.tabs = function(initial, options) {
		if (initial && initial.constructor == Object) { // shift arguments
			options = initial;
			initial = null;
		}
		options = options || {};

		initial = initial && initial.constructor == Number && --initial || 0;

		return this.each(function() {
			new $.ui.tabs(this, $.extend(options, { initial: initial }));
		});
	};

	// other chainable tabs methods
	$.each(['Add', 'Remove', 'Enable', 'Disable', 'Click', 'Load', 'Href'], function(i, method) {
		$.fn['tabs' + method] = function() {
			var args = arguments;
			return this.each(function() {
				var instance = $.ui.tabs.getInstance(this);
				instance[method.toLowerCase()].apply(instance, args);
			});
		};
	});
	$.fn.tabsSelected = function() {
		var selected = -1;
		if (this[0]) {
			var instance = $.ui.tabs.getInstance(this[0]),
				$lis = $('li', this);
			selected = $lis.index( $lis.filter('.' + instance.options.selectedClass)[0] );
		}
		return selected >= 0 ? ++selected : -1;
	};

	// tabs class
	$.ui.tabs = function(el, options) {

		this.source = el;

		this.options = $.extend({

			// basic setup
			initial: 0,
			event: 'click',
			disabled: [],
			cookie: null, // pass options object as expected by cookie plugin: { expires: 7, path: '/', domain: 'jquery.com', secure: true }
			// TODO bookmarkable: $.ajaxHistory ? true : false,
			unselected: false,
			unselect: options.unselected ? true : false,

			// Ajax
			spinner: 'Loading…',
			cache: false,
			idPrefix: 'ui-tabs-',
			ajaxOptions: {},

			// animations
			/*fxFade: null,
			fxSlide: null,
			fxShow: null,
			fxHide: null,*/
			fxSpeed: 'normal',
			/*fxShowSpeed: null,
			fxHideSpeed: null,*/

			// callbacks
			add: function() {},
			remove: function() {},
			enable: function() {},
			disable: function() {},
			click: function() {},
			hide: function() {},
			show: function() {},
			load: function() {},

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

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

		}, options);

		this.options.event += '.ui-tabs'; // namespace event
		this.options.cookie = $.cookie && $.cookie.constructor == Function && this.options.cookie;

		// save instance for later
		$.data(el, $.ui.tabs.INSTANCE_KEY, this);

		// create tabs
		this.tabify(true);
	};

	// static
	$.ui.tabs.INSTANCE_KEY = 'ui_tabs_instance';
	$.ui.tabs.getInstance = function(el) {
		return $.data(el, $.ui.tabs.INSTANCE_KEY);
	};

	// instance methods
	$.extend($.ui.tabs.prototype, {
		tabId: function(a) {
			return a.title ? a.title.replace(/\s/g, '_')
				: this.options.idPrefix + $.data(a);
		},
		tabify: function(init) {

			this.$lis = $('li:has(a[href])', this.source);
			this.$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 "#"
					$.data(a, 'href', a.href);
					var id = self.tabId(a);
					a.href = '#' + id;
					self.$panels = self.$panels.add(
						$('#' + id)[0] || $(o.panelTemplate).attr('id', id).addClass(o.panelClass)
							.insertAfter( self.$panels[i - 1] || self.source )
					);
				}
				// invalid tab href
				else {
					o.disabled.push(i + 1);
				}
			});

			if (init) {

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

				// disabled tabs
				for (var i = 0, position; position = o.disabled[i]; i++) {
					this.disable(position);
				}

				// Try to retrieve initial tab:
				// 1. from fragment identifier in url if present
				// 2. from cookie
				// 3. from selected class attribute on <li>
				// 4. otherwise use given initial argument
				// 5. check if tab is disabled
				this.$tabs.each(function(i, a) {
					if (location.hash) {
						if (a.hash == location.hash) {
							o.initial = i;
							// prevent page scroll to fragment
							//if (($.browser.msie || $.browser.opera) && !o.remote) {
							if ($.browser.msie || $.browser.opera) {
								var $toShow = $(location.hash), toShowId = $toShow.attr('id');
								$toShow.attr('id', '');
								setTimeout(function() {
									$toShow.attr('id', toShowId); // restore id
								}, 500);
							}
							scrollTo(0, 0);
							return false; // break
						}
					} else if (o.cookie) {
						var p = parseInt($.cookie($.ui.tabs.INSTANCE_KEY + $.data(self.source)));
						if (p && self.$tabs[p]) {
							o.initial = p;
							return false; // break
						}
					} else if ( self.$lis.eq(i).hasClass(o.selectedClass) ) {
						o.initial = i;
						return false; // break
					}
				});
				var n = this.$lis.length;
				while (this.$lis.eq(o.initial).hasClass(o.disabledClass) && n) {
					o.initial = ++o.initial < this.$lis.length ? o.initial : 0;
					n--;
				}
				if (!n) { // all tabs disabled, set option unselected to true
					o.unselected = o.unselect = true;
				}

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

				// load if remote tab
				var href = !o.unselected && $.data(this.$tabs[o.initial], 'href');
				if (href) {
					this.load(o.initial + 1, href);
				}

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

			}

			// setup animations
			var showAnim = {}, showSpeed = o.fxShowSpeed || o.fxSpeed,
				hideAnim = {}, hideSpeed = o.fxHideSpeed || o.fxSpeed;
			if (o.fxSlide || o.fxFade) {
				if (o.fxSlide) {
					showAnim['height'] = 'show';
					hideAnim['height'] = 'hide';
				}
				if (o.fxFade) {
					showAnim['opacity'] = 'show';
					hideAnim['opacity'] = 'hide';
				}
			} else {
				if (o.fxShow) {
					showAnim = o.fxShow;
				} else { // use some kind of animation to prevent browser scrolling to the tab
					showAnim['min-width'] = 0; // avoid opacity, causes flicker in Firefox
					showSpeed = 1; // as little as 1 is sufficient
				}
				if (o.fxHide) {
					hideAnim = o.fxHide;
				} else { // use some kind of animation to prevent browser scrolling to the tab
					hideAnim['min-width'] = 0; // avoid opacity, causes flicker in Firefox
					hideSpeed = 1; // as little as 1 is sufficient
				}
			}

			// 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(hideAnim, hideSpeed, function() { //
					$hide.addClass(o.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
					if ($.browser.msie && hideAnim['opacity']) {
						$hide[0].style.filter = '';
					}
					o.hide(clicked, $hide[0], $show && $show[0] || null);
					if ($show) {
						showTab(clicked, $show, $hide);
					}
				});
			}

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

			// 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(o.event).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 click callback returns false stop here.
				// Check if click handler returns false last so that it is not executed for a disabled tab!
				if (($li.hasClass(o.selectedClass) && !o.unselect) || $li.hasClass(o.disabledClass)
					|| o.click(this, $show[0], $hide[0]) === false) {
					this.blur();
					return false;
				}

				if (o.cookie) {
					$.cookie($.ui.tabs.INSTANCE_KEY + $.data(self.source), self.$tabs.index(this), o.cookie);
				}

				// if tab may be closed
				if (o.unselect) {
					if ($li.hasClass(o.selectedClass)) {
						$li.removeClass(o.selectedClass);
						self.$panels.stop();
						hideTab(this, $hide);
						this.blur();
						return false;
					} else if (!$hide.length) {
						self.$panels.stop();
						if ($.data(this, 'href')) { // remote tab
							var a = this;
							self.load(self.$tabs.index(this) + 1, $.data(this, 'href'), function() {
								$li.addClass(o.selectedClass).addClass(o.unselectClass);
								showTab(a, $show);
							});
						} else {
							$li.addClass(o.selectedClass).addClass(o.unselectClass);
							showTab(this, $show);
						}
						this.blur();
						return false;
					}
				}

				// 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);
					}*/

					if ($.data(this, 'href')) { // remote tab
						var a = this;
						self.load(self.$tabs.index(this) + 1, $.data(this, 'href'), function() {
							switchTab(a, $li, $hide, $show);
						});
					} else {
						switchTab(this, $li, $hide, $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;

			});

		},
		add: function(url, text, position) {
			if (url && text) {
				position = position || this.$tabs.length; // append by default  

				var o = this.options,
					$li = $(o.tabTemplate.replace(/#\{href\}/, url).replace(/#\{text\}/, text));

				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);
				$panel = $panel.length && $panel
					|| $(o.panelTemplate).attr('id', id).addClass(o.panelClass).addClass(o.hideClass);
				if (position >= this.$lis.length) {
					$li.appendTo(this.source);
					$panel.appendTo(this.source.parentNode);
				} else {
					$li.insertBefore(this.$lis[position - 1]);
					$panel.insertBefore(this.$panels[position - 1]);
				}

				this.tabify();

				if (this.$tabs.length == 1) {
					 $li.addClass(o.selectedClass);
					 $panel.removeClass(o.hideClass);
					 var href = $.data(this.$tabs[0], 'href');
					 if (href) {
						 this.load(position + 1, href);
					 }
				}
				o.add(this.$tabs[position], this.$panels[position]); // callback
			} else {
				throw 'jQuery UI Tabs: Not enough arguments to add tab.';
			}
		},
		remove: function(position) {
			if (position && position.constructor == Number) {                
				var o = this.options, $li = this.$lis.eq(position - 1).remove(),
					$panel = this.$panels.eq(position - 1).remove();

				// If selected tab was removed focus tab to the right or
				// tab to the left if last tab was removed.
				if ($li.hasClass(o.selectedClass) && this.$tabs.length > 1) {
					this.click(position + (position < this.$tabs.length ? 1 : -1));
				}
				this.tabify();
				o.remove($li.end()[0], $panel[0]); // callback
			}
		},
		enable: function(position) {
			var o = this.options, $li = this.$lis.eq(position - 1);
			$li.removeClass(o.disabledClass);
			if ($.browser.safari) { // fix disappearing tab (that used opacity indicating disabling) after enabling in Safari 2...
				$li.css('display', 'inline-block');
				setTimeout(function() {
					$li.css('display', 'block')
				}, 0)
			}
			o.enable(this.$tabs[position - 1], this.$panels[position - 1]); // callback
		},
		disable: function(position) {
			var o = this.options;      
			this.$lis.eq(position - 1).addClass(o.disabledClass);
			o.disable(this.$tabs[position - 1], this.$panels[position - 1]); // callback
		},
		click: function(position) {
			this.$tabs.eq(position - 1).trigger(this.options.event);
		},
		load: function(position, url, callback) {
			var self = this, o = this.options,
				$a = this.$tabs.eq(position - 1), a = $a[0], $span = $('span', a);

			// shift arguments
			if (url && url.constructor == Function) {
				callback = url;
				url = null;
			}

			// set new URL or get existing
			if (url) {
				$.data(a, 'href', url);
			} else {
				url = $.data(a, 'href');
			}

			// load
			if (o.spinner) {
				$.data(a, 'title', $span.html());
				$span.html('<em>' + o.spinner + '</em>');
			}
			var finish = function() {
				self.$tabs.filter('.' + o.loadingClass).each(function() {
					$(this).removeClass(o.loadingClass);
					if (o.spinner) {
						$('span', this).html( $.data(this, 'title') );
					}
				});
				self.xhr = null;
			};
			var ajaxOptions = $.extend(o.ajaxOptions, {
				url: url,
				success: function(r) {
					$(a.hash).html(r);
					finish();
					// This callback is required because the switch has to take 
					// place after loading has completed.
					if (callback && callback.constructor == Function) {
						callback();
					}
					if (o.cache) {
						$.removeData(a, 'href'); // if loaded once do not load them again
					}
					o.load(self.$tabs[position - 1], self.$panels[position - 1]); // callback
				}
			});
			if (this.xhr) {
				// terminate pending requests from other tabs and restore title
				this.xhr.abort();
				finish();
			}
			$a.addClass(o.loadingClass);
			setTimeout(function() { // timeout is again required in IE, "wait" for id being restored
				self.xhr = $.ajax(ajaxOptions);
			}, 0);

		},
		href: function(position, href) {
			$.data(this.$tabs.eq(position - 1)[0], 'href', href);
		}
	});

})(jQuery);