(function($) { // block scope

$.extend({
    tabs: {
        remoteCount: 0 // TODO in Tabs 3 this is going to be more cleanly in one single namespace
    }
});


$.fn.tabs = function(initial, settings) {

    // settings
    if (typeof initial == 'object') settings = initial; // no initial tab given but a settings object
    settings = $.extend({
        initial: (initial && typeof initial == 'number' && initial > 0) ? --initial : 0,
        disabled: null,
        bookmarkable: $.ajaxHistory ? true : false,
        remote: false,
        spinner: 'Loading…',
        hashPrefix: 'remote-tab-',
        fxFade: null,
        fxSlide: null,
        fxShow: null,
        fxHide: null,
        fxSpeed: 'normal',
        fxShowSpeed: null,
        fxHideSpeed: null,
        fxAutoHeight: false,
        onClick: null,
        onHide: null,
        onShow: null,
        navClass: 'tabs-nav',
        selectedClass: 'tabs-selected',
        disabledClass: 'tabs-disabled',
        containerClass: 'tabs-container',
        hideClass: 'tabs-hide',
        loadingClass: 'tabs-loading',
        tabStruct: 'div'
    }, settings || {});

    $.browser.msie6 = $.browser.msie && ($.browser.version && $.browser.version < 7 || /MSIE 6.0/.test(navigator.userAgent)); // do not check for 6.0 alone, userAgent in Windows Vista has "Windows NT 6.0"

    // helper to prevent scroll to fragment
    function unFocus() {
        scrollTo(0, 0);
    }

    // initialize tabs
    return this.each(function() {

        // remember wrapper for later
        var container = this;

        // setup nav
        var nav = jQuery('ul.' + settings.navClass, container);
        nav = nav.size() && nav || jQuery('>ul:eq(0)', container); // fallback to default structure
        var tabs = jQuery('a', nav);

        // prepare remote tabs
        if (settings.remote) {
            tabs.each(function() {
                var id = settings.hashPrefix + (++$.tabs.remoteCount), hash = '#' + id, url = this.href;
                this.href = hash;
                jQuery('<div id="' + id + '" class="' + settings.containerClass + '"></div>').appendTo(container);

                jQuery(this).bind('loadRemoteTab', function(e, callback) {
															
                    var $$ = jQuery(this).addClass(settings.loadingClass), span = jQuery('span', this)[0], tabTitle = span.innerHTML;
                    if (settings.spinner) {
                        // TODO if spinner is image
                        span.innerHTML = '<em>' + settings.spinner + '</em>'; // WARNING: html(...) crashes Safari with jQuery 1.1.2
                    }
                    setTimeout(function() { // Timeout is again required in IE, "wait" for id being restored
                        jQuery(hash).load(url, function() {
                            if (settings.spinner) {
                                span.innerHTML = tabTitle; // WARNING: html(...) crashes Safari with jQuery 1.1.2
                            }
                            $$.removeClass(settings.loadingClass);
                            callback && callback();
                        });
                    }, 0);
                });

            });
        }

        // set up containers
        var containers = jQuery('div.' + settings.containerClass, container);
        containers = containers.size() && containers || jQuery('>' + settings.tabStruct, container); // fallback to default structure

        // attach classes for styling if not present
        nav.is('.' + settings.navClass) || nav.addClass(settings.navClass);
        containers.each(function() {
            var $$ = jQuery(this);
            $$.is('.' + settings.containerClass) || $$.addClass(settings.containerClass);
        });

        // try to retrieve active tab from class in HTML
        var hasSelectedClass = jQuery('li', nav).index( jQuery('li.' + settings.selectedClass, nav)[0] );
        if (hasSelectedClass >= 0) {
           settings.initial = hasSelectedClass;
        }

        // try to retrieve active tab from hash in url, will override class in HTML
        if (location.hash) {
			
			
            tabs.each(function(i) {
                if (this.hash == location.hash) {
                    settings.initial = i;
                    // prevent page scroll to fragment
                    if (($.browser.msie || $.browser.opera) && !settings.remote) {
						
                        var toShow = jQuery(location.hash);
                        var toShowId = toShow.attr('id');
                        toShow.attr('id', '');
                        setTimeout(function() {
                            toShow.attr('id', toShowId); // restore id
                        }, 500);
                    }
                    unFocus();
                    return false; // break
                }
            });
        }
        if ($.browser.msie) {
            unFocus(); // fix IE focussing bottom of the page for some unknown reason
        }

        // highlight tab accordingly
        containers.filter(':eq(' + settings.initial + ')').show().end().not(':eq(' + settings.initial + ')').addClass(settings.hideClass);
        jQuery('li', nav).removeClass(settings.selectedClass).eq(settings.initial).addClass(settings.selectedClass); // we need to remove classes eventually if hash takes precedence over class
        // trigger load of initial tab
        tabs.eq(settings.initial).trigger('loadRemoteTab').end();

        // setup auto height
        if (settings.fxAutoHeight) {
            // helper
            var _setAutoHeight = function(reset) {
                // get tab heights in top to bottom ordered array
                var heights = $.map(containers.get(), function(el) {
                    var h, jq = jQuery(el);
                    if (reset) {
                        if ($.browser.msie6) {
                            el.style.removeExpression('behaviour');
                            el.style.height = '';
                            el.minHeight = null;
                        }
                        h = jq.css({'min-height': ''}).height(); // use jQuery's height() to get hidden element values
                    } else {
                        h = jq.height(); // use jQuery's height() to get hidden element values
                    }
                    return h;
                }).sort(function(a, b) {
                    return b - a;
                });
                if ($.browser.msie6) {
                    containers.each(function() {
                        this.minHeight = heights[0] + 'px';
                        this.style.setExpression('behaviour', 'this.style.height = this.minHeight ? this.minHeight : "1px"'); // using an expression to not make print styles useless
                    });
                } else {
                    containers.css({'min-height': heights[0] + 'px'});
                }
            };
            // call once for initialization
            _setAutoHeight();
            // trigger auto height adjustment if needed
            var cachedWidth = container.offsetWidth;
            var cachedHeight = container.offsetHeight;
            var watchFontSize = jQuery('#tabs-watch-font-size').get(0) || jQuery('<span id="tabs-watch-font-size">M</span>').css({display: 'block', position: 'absolute', visibility: 'hidden'}).appendTo(document.body).get(0);
            var cachedFontSize = watchFontSize.offsetHeight;
            setInterval(function() {
                var currentWidth = container.offsetWidth;
                var currentHeight = container.offsetHeight;
                var currentFontSize = watchFontSize.offsetHeight;
                if (currentHeight > cachedHeight || currentWidth != cachedWidth || currentFontSize != cachedFontSize) {
                    _setAutoHeight((currentWidth > cachedWidth || currentFontSize < cachedFontSize)); // if heights gets smaller reset min-height
                    cachedWidth = currentWidth;
                    cachedHeight = currentHeight;
                    cachedFontSize = currentFontSize;
                }
            }, 50);
        }

        // setup animations
        var showAnim = {}, hideAnim = {}, showSpeed = settings.fxShowSpeed || settings.fxSpeed, hideSpeed = settings.fxHideSpeed || settings.fxSpeed;
        if (settings.fxSlide || settings.fxFade) {
            if (settings.fxSlide) {
                showAnim['height'] = 'show';
                hideAnim['height'] = 'hide';
            }
            if (settings.fxFade) {
                showAnim['opacity'] = 'show';
                hideAnim['opacity'] = 'hide';
            }
        } else {
            if (settings.fxShow) {
                showAnim = settings.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 (settings.fxHide) {
                hideAnim = settings.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
            }
        }

        // callbacks
        var onClick = settings.onClick, onHide = settings.onHide, onShow = settings.onShow;

        // attach activateTab event, required for activating a tab programmatically
        tabs.bind('triggerTab', function() {

            // if the tab is already selected or disabled or animation is still running stop here
            var li = jQuery(this).parents('li:eq(0)');
            if (container.locked || li.is('.' + settings.selectedClass) || li.is('.' + settings.disabledClass)) {
                return false;
            }

            var hash = this.hash;
			

            if ($.browser.msie) {

                jQuery(this).trigger('click');
                if (settings.bookmarkable) {
                    $.ajaxHistory.update(hash);
                    location.hash = hash.replace('#', '');
                }

            } else if ($.browser.safari) {
				
                // Simply setting location.hash puts Safari into the eternal load state... ugh! Submit a form instead.
                var tempForm = jQuery('<form action="' + hash + '"><div><input type="submit" value="h" /></div></form>').get(0); // no need to append it to the body
                tempForm.submit(); // does not trigger the form's submit event...
                jQuery(this).trigger('click'); // ...thus do stuff here
                if (settings.bookmarkable) {
                    $.ajaxHistory.update(hash);
                }

            } else {

                if (settings.bookmarkable) {
                    location.hash = hash.replace('#', '');
                } else {
                    jQuery(this).trigger('click');
                }

            }

        });

        // attach disable event, required for disabling a tab
        tabs.bind('disableTab', function() {
            var li = jQuery(this).parents('li:eq(0)');
            if ($.browser.safari) { /* fix opacity of tab after disabling in Safari... */
                li.animate({ opacity: 0 }, 1, function() {
                   li.css({opacity: ''});
                });
            }
            li.addClass(settings.disabledClass);
        });

        // disabled from settings
        if (settings.disabled && settings.disabled.length) {
            for (var i = 0, k = settings.disabled.length; i < k; i++) {
                tabs.eq(--settings.disabled[i]).trigger('disableTab').end();
            }
        };

        // attach enable event, required for reenabling a tab
        tabs.bind('enableTab', function() {
            var li = jQuery(this).parents('li:eq(0)');
            li.removeClass(settings.disabledClass);
            if ($.browser.safari) { /* fix disappearing tab after enabling in Safari... */
                li.animate({ opacity: 1 }, 1, function() {
                    li.css({opacity: ''});
                });
            }
        });

        // enable history support if bookmarking and history is turned on
        if (settings.bookmarkable) {
            $.ajaxHistory.initialize(function() {
                tabs.eq(settings.initial).trigger('click').end();
            });
        }

    });

};




var tabEvents = ['triggerTab', 'disableTab', 'enableTab'];
for (var i = 0; i < tabEvents.length; i++) {
    $.fn[tabEvents[i]] = (function(tabEvent) {
        return function(tab) {
            return this.each(function() {
                var nav = jQuery('ul.tabs-nav' , this);
                nav = nav.size() && nav || jQuery('>ul:eq(0)', this); // fallback to default structure
                var a;
                if (!tab || typeof tab == 'number') {
                    a = jQuery('li a', nav).eq((tab && tab > 0 && tab - 1 || 0)); // fall back to 0
                } else if (typeof tab == 'string') {
                    a = jQuery('li a[href*="#' + tab + '"]', nav);
                }
                a.trigger(tabEvent);
            });
        };
    })(tabEvents[i]);
}


$.fn.activeTab = function() {
    var selectedTabs = [];
    this.each(function() {
        var nav = jQuery('ul.tabs-nav' , this);
        nav = nav.size() && nav || jQuery('>ul:eq(0)', this); //fallback to default structure
        var lis = jQuery('li', nav);
        selectedTabs.push(lis.index( lis.filter('.tabs-selected')[0] ) + 1);
    });
    return selectedTabs[0];
};

})(jQuery);