/*
 * 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
 *
 * Revision: $Id$
 */
;(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 {
                                instance: this,
                                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.hasClass(o.navClass) || this.element.addClass(o.navClass);
                                this.$panels.each(function() {
                                        var $this = $(this);
                                        $this.hasClass(o.panelClass) || $this.addClass(o.panelClass);
                                });


                                // 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\}/, url).replace(/#\{label\}/, 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.panelClass).addClass(o.hideClass);
                                $panel.data('destroy.tabs', true);
                        }
                        if (index >= this.$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',
                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);