/**
 * Tabs - jQuery plugin for accessible, unobtrusive tabs
 * @requires jQuery v1.1.1
 *
 * http://stilbuero.de/tabs/
 *
 * Copyright (c) 2006 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Version: 2.7.4
 */

(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 = $('ul.' + settings.navClass, container);
        nav = nav.size() && nav || $('>ul:eq(0)', container); // fallback to default structure
        var tabs = $('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;
                $('<div id="' + id + '" class="' + settings.containerClass + '"></div>').appendTo(container);

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

            });
        }

        // set up containers
        var containers = $('div.' + settings.containerClass, container);
        containers = containers.size() && containers || $('>' + 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 $$ = $(this);
            $$.is('.' + settings.containerClass) || $$.addClass(settings.containerClass);
        });

        // try to retrieve active tab from class in HTML
        var hasSelectedClass = $('li', nav).index( $('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 = $(location.hash);
                        var toShowId = toShow.attr('id');
                        toShow.attr('id', '');
                        setTimeout(function() {
                            toShow.attr('id', toShowId); // restore id
                        }, 500);
                    }
                    unFocus();
                    return false; // break
                }
            });
        }
        if ($.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);
        $('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 = $(el);
                    if (reset) {
                        if ($.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 = $('#tabs-watch-font-size').get(0) || $('<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 = $(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) {

                $(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 = $('<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...
                $(this).trigger('click'); // ...thus do stuff here
                if (settings.bookmarkable) {
                    $.ajaxHistory.update(hash);
                }

            } else {

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

            }

        });

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

        // attach click event
        tabs.bind('click', function(e) {

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

            // if animation is still running, tab is selected or disabled or onClick callback returns false stop here
            // check if onClick returns false last so that it is not executed for a disabled tab
            if (container['locked'] || li.is('.' + settings.selectedClass) || li.is('.' + settings.disabledClass) || typeof onClick == 'function' && onClick(this, toShow[0], toHide[0]) === false) {
                this.blur();
                return false;
            }

            container['locked'] = true;

            // show new tab
            if (toShow.size()) {

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

                var resetCSS = { display: '', overflow: '', height: '' };
                if (!$.browser.msie) { // not in IE to prevent ClearType font issue
                    resetCSS['opacity'] = '';
                }
                
                // switch tab, animation prevents browser scrolling to the fragment
                function switchTab() {
                    if (settings.bookmarkable && trueClick) { // add to history only if true click occured, not a triggered click
                        $.ajaxHistory.update(clicked.hash);
                    }
                    toHide.animate(hideAnim, hideSpeed, function() { //
                        $(clicked).parents('li:eq(0)').addClass(settings.selectedClass).siblings().removeClass(settings.selectedClass);
                        toHide.addClass(settings.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.                        
                        if (typeof onHide == 'function') {
                            onHide(clicked, toShow[0], toHide[0]);
                        }
                        if (!(settings.fxSlide || settings.fxFade || settings.fxShow)) {
                            toShow.css('display', 'block'); // prevent occasionally occuring flicker in Firefox cause by gap between showing and hiding the tab containers
                        }
                        toShow.animate(showAnim, showSpeed, function() {
                            toShow.removeClass(settings.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
                            if ($.browser.msie) {
                                toHide[0].style.filter = '';
                                toShow[0].style.filter = '';
                            }
                            if (typeof onShow == 'function') {
                                onShow(clicked, toShow[0], toHide[0]);
                            }
                            container['locked'] = null;
                        });
                    });
                }

                if (!settings.remote) {
                    switchTab();
                } else {
                    $(clicked).trigger('loadRemoteTab', [switchTab]);
                }

            } else {
                alert('There is no such container.');
            }

            // 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() {
                window.scrollTo(scrollX, scrollY);
            }, 0);

            this.blur(); // prevent IE from keeping other link focussed when using the back button

            return settings.bookmarkable && !!trueClick; // convert undefined to Boolean for IE

        });

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

    });

};

/**
 * Activate a tab programmatically with the given position (no zero-based index)
 * or its id, e.g. the URL's fragment identifier/hash representing a tab, as if the tab
 * itself were clicked.
 *
 * @example $('#container').triggerTab(2);
 * @desc Activate the second tab of the tab interface contained in <div id="container">.
 * @example $('#container').triggerTab(1);
 * @desc Activate the first tab of the tab interface contained in <div id="container">.
 * @example $('#container').triggerTab();
 * @desc Activate the first tab of the tab interface contained in <div id="container">.
 * @example $('#container').triggerTab('fragment-2');
 * @desc Activate a tab via its URL fragment identifier representation.
 *
 * @param String|Number tab Either a string that matches the id of the tab (the URL's
 *                          fragment identifier/hash representing a tab) or an integer
 *                          specifying the position of the tab (no zero-based index) to
 *                          be activated. If this parameter is omitted, the first tab
 *                          will be activated.
 * @type jQuery
 *
 * @name triggerTab
 * @cat Plugins/Tabs
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

/**
 * Disable a tab, so that clicking it has no effect.
 *
 * @example $('#container').disableTab(2);
 * @desc Disable the second tab of the tab interface contained in <div id="container">.
 *
 * @param String|Number tab Either a string that matches the id of the tab (the URL's
 *                          fragment identifier/hash representing a tab) or an integer
 *                          specifying the position of the tab (no zero-based index) to
 *                          be disabled. If this parameter is omitted, the first tab
 *                          will be disabled.
 * @type jQuery
 *
 * @name disableTab
 * @cat Plugins/Tabs
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

/**
 * Enable a tab that has been disabled.
 *
 * @example $('#container').enableTab(2);
 * @desc Enable the second tab of the tab interface contained in <div id="container">.
 *
 * @param String|Number tab Either a string that matches the id of the tab (the URL's
 *                          fragment identifier/hash representing a tab) or an integer
 *                          specifying the position of the tab (no zero-based index) to
 *                          be enabled. If this parameter is omitted, the first tab
 *                          will be enabled.
 * @type jQuery
 *
 * @name enableTab
 * @cat Plugins/Tabs
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

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 = $('ul.tabs-nav' , this);
                nav = nav.size() && nav || $('>ul:eq(0)', this); // fallback to default structure
                var a;
                if (!tab || typeof tab == 'number') {
                    a = $('li a', nav).eq((tab && tab > 0 && tab - 1 || 0)); // fall back to 0
                } else if (typeof tab == 'string') {
                    a = $('li a[@href$="#' + tab + '"]', nav);
                }
                a.trigger(tabEvent);
            });
        };
    })(tabEvents[i]);
}

/**
 * Get the position of the currently selected tab (no zero-based index).
 *
 * @example $('#container').activeTab();
 * @desc Get the position of the currently selected tab of an interface
 * contained in <div id="container">.
 *
 * @type Number
 *
 * @name activeTab
 * @cat Plugins/Tabs
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

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

})(jQuery);