/**
* Accessible Tabs - jQuery plugin for accessible, unobtrusive tabs
* Build to seemlessly work with the CCS-Framework YAML (yaml.de) not depending on YAML though
* @requires jQuery - tested with 1.7 and 1.4.2 but might as well work with older versions
*
* english article: http://blog.ginader.de/archives/2009/02/07/jQuery-Accessible-Tabs-How-to-make-tabs-REALLY-accessible.php
* german article: http://blog.ginader.de/archives/2009/02/07/jQuery-Accessible-Tabs-Wie-man-Tabs-WIRKLICH-zugaenglich-macht.php
*
* code: http://github.com/ginader/Accessible-Tabs
* please report issues at: http://github.com/ginader/Accessible-Tabs/issues
*
* Copyright (c) 2007 Dirk Ginader (ginader.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: 1.9.4
*
* History:
* * 1.0 initial release
* * 1.1 added a lot of Accessibility enhancements
* * * rewrite to use "fn.extend" structure
* * * added check for existing ids on the content containers to use to proper anchors in the tabs
* * 1.1.1 changed the headline markup. thanks to Mike Davies for the hint.
* * 1.5 thanks to Dirk Jesse, Ansgar Hein, David Maciejewski and Mike West for commiting patches to this release
* * * new option syncheights that syncs the heights of the tab contents when the SyncHeight plugin
* * is available http://blog.ginader.de/dev/jquery/syncheight/index.php
* * * fixed the hardcoded current class
* * * new option tabsListClass to be applied to the generated list of tabs above the content so lists
* * inside the tabscontent can be styled differently
* * * added clearfix and tabcounter that adds a class in the schema "tabamount{number amount of tabs}"
* * to the ul containg the tabs so one can style the tabs to fit 100% into the width
* * * new option "syncHeightMethodName" fixed issue: http://github.com/ginader/Accessible-Tabs/issues/2/find
* * * new Method showAccessibleTab({index number of the tab to show starting with 0}) fixed issue: http://github.com/ginader/Accessible-Tabs/issues/3/find
* * * added support for the Cursor Keys to come closer to the WAI ARIA Tab Panel Best Practices http://github.com/ginader/Accessible-Tabs/issues/1/find
* * 1.6
* * * new option "saveState" to allow tabs remember their selected state using cookies requires the cookie plugin: http://plugins.jquery.com/project/Cookie
* * * changed supported jquery version to 1.4.2 to make sure it's future compatible
* * * new option "autoAnchor" which allows to add ID's to headlines in the tabs markup that allow direct linking into a tab i.e.: file.html#headlineID
* * 1.7
* * * new option "pagination" that adds links to show the next/previous tab. This adds the following markup to each tab for you to style:
<ul class="pagination">
<li class="previous"><a href="#{the-id-of-the-previous-tab}"><span>{the headline of the previous tab}</span></a></li>
<li class="next"><a href="#{the-id-of-the-next-tab}"><span>{the headline of the previous tab}</span></a></li>
</ul>
* * 1.8
* * * new option "position" can be 'top' or 'bottom'. Defines where the tabs list is inserted.
* * 1.8.1
* * * Bugfix for broken pagination in ie6 and 7: Selector and object access modified by Daniel K�nt�s (www.MilkmanMedia.de). Thanks to Carolin Moll for the report.
* * 1.8.2
* * * Bugfix for issue described by Sunshine here: http://blog.ginader.de/archives/2009/02/07/jQuery-Accessible-Tabs-How-to-make-tabs-REALLY-accessible.php#c916
* * 1.8.3
* * * Bugfix by Michael Schulze: Only change current class in tab navigation and not in all unordered lists inside the tabs.
* * 1.9
* * * new method showAccessibleTabSelector({valid jQuery selector of the tab to show}) that allows the opening of tabs \
* * * by jQuery Selector instead of the index in showAccessibleTab() fixing issue https://github.com/ginader/Accessible-Tabs/issues/15
* * 1.9.1 by Michael Schulze:
* * * firstNavItemClass and lastNavItemClass to define a custom classname on the first and last tab
* * * wrapInnerNavLinks: inner wrap for a-tags in tab navigation.
* * 1.9.2
* * * Bugfix by Dirk Jesse: fixing an issue that happened when passing multiple selectors to the init call instead of one
* * * Bugfix that fixes a reset of the tabs counter when accessibleTabs() was called more than once on a page
* * 1.9.3
* * * Bugfix by Norm: before, when cssClassAvailable was true, all of the tabhead elements had to have classes or they wouldn't get pulled out into tabs.
* * * This commit fixes this assumption, as I only want classes on some elements https://github.com/ginader/Accessible-Tabs/pull/25
* * 1.9.4 Bugfix by Patrick Bruckner to fix issue with Internet Explorer using jQuery 1.7 https://github.com/ginader/Accessible-Tabs/issues/26
*/


(function($) {
    var debugMode = true;
    $.fn.extend({
        // We assume there could be multiple sets of tabs on a page, so,
        // the unique id for each invididual tab's heading is identified with params q and r (e.g., id="accessibletabscontent0-2")
        getUniqueId: function(p, q, r){
            if (r===undefined) {r='';} else {r='-'+r;}
            return p + q + r;
        },
        accessibleTabs: function(config) {
            var defaults = {
                wrapperClass: 'content', // Classname to apply to the div that is wrapped around the original Markup
                currentClass: 'current', // Classname to apply to the LI of the selected Tab
                tabhead: 'h4', // Tag or valid Query Selector of the Elements to Transform the Tabs-Navigation from (originals are removed)
                tabheadClass: 'tabhead', // Classname to apply to the target heading element for each tab div
                tabbody: '.tabbody', // Tag or valid Query Selector of the Elements to be treated as the Tab Body
                fx:'show', // can be "fadeIn", "slideDown", "show"
                fxspeed: 'normal', // speed (String|Number): "slow", "normal", or "fast") or the number of milliseconds to run the animation
                currentInfoText: 'current tab: ', // text to indicate for screenreaders which tab is the current one
                currentInfoPosition: 'prepend', // Definition where to insert the Info Text. Can be either "prepend" or "append"
                currentInfoClass: 'current-info', // Class to apply to the span wrapping the CurrentInfoText
                tabsListClass:'tabs-list', // Class to apply to the generated list of tabs above the content
                syncheights:false, // syncs the heights of the tab contents when the SyncHeight plugin is available http://blog.ginader.de/dev/jquery/syncheight/index.php
                syncHeightMethodName:'syncHeight', // set the Method name of the plugin you want to use to sync the tab contents. Defaults to the SyncHeight plugin: http://github.com/ginader/syncHeight
                cssClassAvailable:false, // Enable individual css classes for tabs. Gets the appropriate class name of a tabhead element and apply it to the tab list element. Boolean value
                saveState:false, // save the selected tab into a cookie so it stays selected after a reload. This requires that the wrapping div needs to have an ID (so we know which tab we're saving)
                autoAnchor:false, // will move over any existing id of a headline in tabs markup so it can be linked to it
                pagination:false, // adds buttons to each tab to switch to the next/previous tab
                position:'top', // can be 'top' or 'bottom'. Defines where the tabs list is inserted.
                wrapInnerNavLinks: '', // inner wrap for a-tags in tab navigation. See http://api.jquery.com/wrapInner/ for further informations
                firstNavItemClass: 'first', // Classname of the first list item in the tab navigation
                lastNavItemClass: 'last' // Classname of the last list item in the tab navigation
            };
            var keyCodes = {
                37 : -1, //LEFT
                38 : -1, //UP
                39 : +1, //RIGHT
                40 : +1 //DOWN
            };
            var positions = {
                top : 'prepend',
                bottom : 'append'
            };
            this.options = $.extend(defaults, config);

            var tabsCount = 0;
            if($("body").data('accessibleTabsCount') !== undefined){
                tabsCount = $("body").data('accessibleTabsCount');
            }
            $("body").data('accessibleTabsCount',this.length+tabsCount);

            var o = this;
            return this.each(function(t) {
                var el = $(this);
                var list = '';
                var tabCount = 0;
                var ids = [];

                $(el).wrapInner('<div class="'+o.options.wrapperClass+'"></div>');

                $(el).find(o.options.tabhead).each(function(i){
                    var id = '';
                    elId = $(this).attr('id');
                    if(elId){
                        // Skip this item if it already exists.
                        if(elId.indexOf('accessibletabscontent') === 0) {
                            return;
                        }
                        id =' id="'+elId+'"';
                    }
                    var tabId = o.getUniqueId('accessibletabscontent', tabsCount+t, i);//get a unique id to assign to this tab's heading
                    var navItemId = o.getUniqueId('accessibletabsnavigation', tabsCount+t, i);//get a unique id for this navigation item
                    ids.push(tabId);
                    if(o.options.cssClassAvailable === true) {
                        var cssClass = '';
                        if($(this).attr('class')) {
                            cssClass = $(this).attr('class');
                            cssClass = ' class="'+cssClass+'"';
                        }
                        list += '<li id="'+navItemId+'"><a'+id+''+cssClass+' href="#'+tabId+'">'+$(this).html()+'</a></li>';
                    } else {
                      list += '<li id="'+navItemId+'"><a'+id+' href="#'+tabId+'">'+$(this).html()+'</a></li>';
                    }
                    $(this).attr({"id": tabId, "class": o.options.tabheadClass, "tabindex": "-1"});//assign the unique id and the tabheadClass class name to this tab's heading
                    tabCount++;
                });
                
                if (o.options.syncheights && $.fn[o.options.syncHeightMethodName]) {
                    $(el).find(o.options.tabbody)[o.options.syncHeightMethodName]();
                    $(window).on('resize', function(){
                        $(el).find(o.options.tabbody)[o.options.syncHeightMethodName]();
                    });
                }

                // Ensure that the call to setup tabs is re-runnable
                var tabs_selector = '.' + o.options.tabsListClass;
                if(!$(el).find(tabs_selector).length) {
                    $(el)[positions[o.options.position]]('<ul class="clearfix '+o.options.tabsListClass+' tabamount'+tabCount+'"></ul>');
                }

                $(el).find(tabs_selector).append(list);

                // initial show first content block and hide the others
                var content = $(el).find(o.options.tabbody);
                if (content.length > 0) {
                    $(content).hide();
                    $(content[0]).show();
                }
                $(el).find("ul."+o.options.tabsListClass+">li:first").addClass(o.options.currentClass).addClass(o.options.firstNavItemClass)
                  .find('a')[o.options.currentInfoPosition]('<span class="'+o.options.currentInfoClass+'">'+o.options.currentInfoText+'</span>')
                  .parents("ul."+o.options.tabsListClass).children('li:last').addClass(o.options.lastNavItemClass);
                
                if (o.options.wrapInnerNavLinks) {
                  $(el).find('ul.'+o.options.tabsListClass+'>li>a').wrapInner(o.options.wrapInnerNavLinks);
                }
                
                $(el).find('ul.'+o.options.tabsListClass+'>li>a').each(function(i){
                    $(this).on('click', function(event) {

                        event.preventDefault();
                        if(event.originalEvent){
                            $(el).find('.' + o.options.currentClass).removeClass(o.options.currentClass);
                            $(event.target).parent().addClass(o.options.currentClass);

                            $('.' + o.options.wrapperClass).children('div').hide();

                            //$($(event.target).attr('href')).next().show();
                            $($(event.target).attr('href'),true).next().show();                    //IE BUG mit jQuery beheben
                        }

//                       event.preventDefault();
//                        el.trigger("showTab.accessibleTabs", [$(event.target)]);
//                        if(o.options.saveState && $.cookie){
//                            $.cookie('accessibletab_'+el.attr('id')+'_active',i);
//                        }
//                        $(el).find('ul.'+o.options.tabsListClass+'>li.'+o.options.currentClass).removeClass(o.options.currentClass)
//                        .find("span."+o.options.currentInfoClass).remove();
//                        $(this).blur();
//                        $(el).find(o.options.tabbody+':visible').hide();
    //                        $(el).find(o.options.tabbody).eq(i)[o.options.fx](o.options.fxspeed);
//                        $(this)[o.options.currentInfoPosition]('<span class="'+o.options.currentInfoClass+'">'+o.options.currentInfoText+'</span>')
//                        .parent().addClass(o.options.currentClass);
//                        //now, only after writing the currentInfoText span to the tab list link, set focus to the tab's heading
//                        $($(this).attr("href"),true).focus().keyup(function(event){
//                            if(keyCodes[event.keyCode]){
//                                o.showAccessibleTab(i+keyCodes[event.keyCode]);
//                                $(this).unbind( "keyup" );
//                            }
//                        });

                        // $(el).find('.accessibletabsanchor').keyup(function(event){
                        // if(keyCodes[event.keyCode]){
                        // o.showAccessibleTab(i+keyCodes[event.keyCode]);
                        // }
                        // });                                            f
                        
                        
                    });
                    
                    $(this).on('focus', function(event) {
                        $(document).on('keyup', function(event) {
                            if(keyCodes[event.keyCode]){
                                o.showAccessibleTab(i+keyCodes[event.keyCode]);
                            }
                        });
                    });
                    $(this).on('blur', function(event) {
                        $(document).off("keyup");
                    });
                    
                });
                
                if(o.options.saveState && $.cookie){
                    var savedState = $.cookie('accessibletab_'+el.attr('id')+'_active');
                    debug($.cookie('accessibletab_'+el.attr('id')+'_active'));
                    if(savedState !== null){
                        o.showAccessibleTab(savedState,el.attr('id'));
                    }
                }
                
                if(o.options.autoAnchor && window.location.hash){
                    var anchorTab = $('.'+o.options.tabsListClass).find(window.location.hash);
                    if(anchorTab.length){
                        anchorTab.trigger('click');
                    }
                }
                
                if(o.options.pagination){
                    var m = '<ul class="pagination">';
                    m +=' <li class="previous"><a href="#{previousAnchor}"><span>{previousHeadline}</span></a></li>';
                    m +=' <li class="next"><a href="#{nextAnchor}"><span>{nextHeadline}</span></a></li>';
                    m +='</ul>';
                    var tabs = $(el).find('.tabbody');
                    var tabcount = tabs.length;
                    tabs.each(function(idx){
                        $(this).append(m);
                        var next = idx+1;
                        if(next>=tabcount){next = 0;}
                        var previous = idx-1;
                        if(previous<0){previous = tabcount-1;}
                        var p = $(this).find('.pagination');
                        var previousEl = p.find('.previous');
                        previousEl.find('span').text($('#'+ids[previous]).text());
                        previousEl.find('a').attr('href','#'+ids[previous])
                            .on('click', function(event) {
                            event.preventDefault();
                            $(el).find('.tabs-list a').eq(previous).trigger('click');
                        });
                        var nextEl = p.find('.next');
                        nextEl.find('span').text($('#'+ids[next]).text());
                        nextEl.find('a').attr('href','#'+ids[next])
                            .on('click', function(event) {
                            event.preventDefault();
                            $(el).find('.tabs-list a').eq(next).trigger('click');
                        });
                    });
                }
            });
        },
        showAccessibleTab: function(index,id){
            debug('showAccessibleTab');
            var o = this;
            if(id) {
                var el = $('#'+id);
                var links = el.find('ul.'+o.options.tabsListClass+'>li>a');
                el.trigger("showTab.accessibleTabs", [links.eq(index)]);
                links.eq(index).trigger('click');
            } else {
                return this.each(function() {
                    var el = $(this);
                    el.trigger("showTab.accessibleTabs");
                    var links = el.find('ul.'+o.options.tabsListClass+'>li>a');
                    el.trigger("showTab.accessibleTabs", [links.eq(index)]);
                    links.eq(index).trigger('click');
                });
            }
        },
        showAccessibleTabSelector: function(selector){
            debug('showAccessibleTabSelector');
            var o = this;
            var el = $(selector);
            if(el){
                if(el.get(0).nodeName.toLowerCase() == 'a'){
                    el.trigger('click');
                }else{
                    debug('the selector of a showAccessibleTabSelector() call needs to point to a tabs headline!');
                }
            }
        }
    });
    // private Methods
    function debug(msg,info){
        if(debugMode && window.console && window.console.log){
            if(info){
                window.console.log(info+': ',msg);
            }else{
                window.console.log(msg);
            }
        }
    }
})(jQuery);