//** Accordion Content script: By Dynamic Drive, at http://www.dynamicdrive.com
//** Created: Jan 7th, 08'. Last updated: June 7th, 2010 to v1.9

//Version 1.9: June 7th, 2010':
//**1) Ajax content support added, so a given header's content can be dynamically fetched from an external file and on demand.
//**2) Optimized script performance by caching header and content container references


var ddaccordion = {
    ajaxloadingmsg: '<img src="loading2.gif" /><br />Loading Content...', //customize HTML to output while Ajax content is being fetched (if applicable)

    headergroup: {}, //object to store corresponding header group based on headerclass value
    contentgroup: {}, //object to store corresponding content group based on headerclass value

    preloadimages: function($images) {
        $images.each(function() {
            var preloadimage = new Image()
            preloadimage.src = this.src
        })
    },

    expandone: function(headerclass, selected) { //PUBLIC function to expand a particular header
        this.toggleone(headerclass, selected, "expand")
    },

    collapseone: function(headerclass, selected) { //PUBLIC function to collapse a particular header
        this.toggleone(headerclass, selected, "collapse")
    },

    expandall: function(headerclass) { //PUBLIC function to expand all headers based on their shared CSS classname
        var $headers = this.headergroup[headerclass]
        this.contentgroup[headerclass].filter(':hidden').each(function() {
            $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
        })
    },

    collapseall: function(headerclass) { //PUBLIC function to collapse all headers based on their shared CSS classname
        var $headers = this.headergroup[headerclass]
        this.contentgroup[headerclass].filter(':visible').each(function() {
            $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
        })
    },

    toggleone: function(headerclass, selected, optstate) { //PUBLIC function to expand/ collapse a particular header
        var $targetHeader = this.headergroup[headerclass].eq(selected)
        var $subcontent = this.contentgroup[headerclass].eq(selected)
        if (typeof optstate == "undefined" || optstate == "expand" && $subcontent.is(":hidden") || optstate == "collapse" && $subcontent.is(":visible"))
            $targetHeader.trigger("evt_accordion")
    },

    ajaxloadcontent: function($targetHeader, $targetContent, config, callback) {
        var ajaxinfo = $targetHeader.data('ajaxinfo')

        function handlecontent(content) { //nested function
            if (content) { //if ajax content has loaded
                ajaxinfo.cacheddata = content //remember ajax content 
                ajaxinfo.status = "cached" //set ajax status to cached
                if ($targetContent.queue("fx").length == 0) { //if this content isn't currently expanding or collapsing
                    $targetContent.hide().html(content) //hide loading message, then set sub content's HTML to ajax content
                    ajaxinfo.status = "complete" //set ajax status to complete
                    callback() //execute callback function- expand this sub content
                }
            }
            if (ajaxinfo.status != "complete") {
                setTimeout(function() { handlecontent(ajaxinfo.cacheddata) }, 100) //call handlecontent() again until ajax content has loaded (ajaxinfo.cacheddata contains data)
            }
        } //end nested function

        if (ajaxinfo.status == "none") { //ajax data hasn't been fetched yet
            $targetContent.html(this.ajaxloadingmsg)
            $targetContent.slideDown(config.animatespeed)
            ajaxinfo.status = "loading" //set ajax status to "loading"
            $.ajax({
                url: ajaxinfo.url, //path to external menu file
                error: function(ajaxrequest) {
                    handlecontent('Error fetching content. Server Response: ' + ajaxrequest.responseText)
                },
                success: function(content) {
                    content = (content == "") ? " " : content //if returned content is empty, set it to "space" is content no longer returns false/empty (hasn't loaded yet)
                    handlecontent(content)
                }
            })
        }
        else if (ajaxinfo.status == "loading")
            handlecontent(ajaxinfo.cacheddata)
    },

    expandit: function($targetHeader, $targetContent, config, useractivated, directclick, skipanimation) {
        var ajaxinfo = $targetHeader.data('ajaxinfo')
        if (ajaxinfo) { //if this content should be fetched via Ajax
            if (ajaxinfo.status == "none" || ajaxinfo.status == "loading")
                this.ajaxloadcontent($targetHeader, $targetContent, config, function() { ddaccordion.expandit($targetHeader, $targetContent, config, useractivated, directclick) })
            else if (ajaxinfo.status == "cached") {
                $targetContent.html(ajaxinfo.cacheddata)
                ajaxinfo.cacheddata = null
                ajaxinfo.status = "complete"
            }
        }
        this.transformHeader($targetHeader, config, "expand")
        $targetContent.slideDown(skipanimation ? 0 : config.animatespeed, function() {
            config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)
            if (config.postreveal == "gotourl" && directclick) { //if revealtype is "Go to Header URL upon click", and this is a direct click on the header
                var targetLink = ($targetHeader.is("a")) ? $targetHeader.get(0) : $targetHeader.find('a:eq(0)').get(0)
                if (targetLink) //if this header is a link
                    setTimeout(function() { location = targetLink.href }, 200) //ignore link target, as window.open(targetLink, targetLink.target) doesn't work in FF if popup blocker enabled
            }
        })
    },

    collapseit: function($targetHeader, $targetContent, config, isuseractivated) {
        this.transformHeader($targetHeader, config, "collapse")
        $targetContent.slideUp(config.animatespeed, function() { config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated) })
    },

    transformHeader: function($targetHeader, config, state) {
        $targetHeader.addClass((state == "expand") ? config.cssclass.expand : config.cssclass.collapse) //alternate btw "expand" and "collapse" CSS classes
		.removeClass((state == "expand") ? config.cssclass.collapse : config.cssclass.expand)
        if (config.htmlsetting.location == 'src') { //Change header image (assuming header is an image)?
            $targetHeader = ($targetHeader.is("img")) ? $targetHeader : $targetHeader.find('img').eq(0) //Set target to either header itself, or first image within header
            $targetHeader.attr('src', (state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse) //change header image
        }
        else if (config.htmlsetting.location == "prefix") //if change "prefix" HTML, locate dynamically added ".accordprefix" span tag and change it
            $targetHeader.find('.accordprefix').html((state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse)
        else if (config.htmlsetting.location == "suffix")
            $targetHeader.find('.accordsuffix').html((state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse)
    },

    urlparamselect: function(headerclass) {
        var result = window.location.search.match(new RegExp(headerclass + "=((\\d+)(,(\\d+))*)", "i")) //check for "?headerclass=2,3,4" in URL
        if (result != null)
            result = RegExp.$1.split(',')
        return result //returns null, [index], or [index1,index2,etc], where index are the desired selected header indices
    },

    getCookie: function(Name) {
        var re = new RegExp(Name + "=[^;]+", "i") //construct RE to search for target name/value pair
        if (document.cookie.match(re)) //if cookie found
            return document.cookie.match(re)[0].split("=")[1] //return its value
        return null
    },

    setCookie: function(name, value) {
        document.cookie = name + "=" + value + "; path=/"
    },

    init: function(config) {
        document.write('<style type="text/css">\n')
        document.write('.' + config.contentclass + '{display: none}\n') //generate CSS to hide contents
        document.write('a.hiddenajaxlink{display: none}\n') //CSS class to hide ajax link
        document.write('<\/style>')
        jQuery(document).ready(function($) {
            ddaccordion.urlparamselect(config.headerclass)
            var persistedheaders = ddaccordion.getCookie(config.headerclass)
            ddaccordion.headergroup[config.headerclass] = $('.' + config.headerclass) //remember header group for this accordion
            ddaccordion.contentgroup[config.headerclass] = $('.' + config.contentclass) //remember content group for this accordion
            var $headers = ddaccordion.headergroup[config.headerclass]
            var $subcontents = ddaccordion.contentgroup[config.headerclass]
            config.cssclass = { collapse: config.toggleclass[0], expand: config.toggleclass[1]} //store expand and contract CSS classes as object properties
            config.revealtype = config.revealtype || "click"
            config.revealtype = config.revealtype.replace(/mouseover/i, "mouseenter")
            if (config.revealtype == "clickgo") {
                config.postreveal = "gotourl" //remember added action
                config.revealtype = "click" //overwrite revealtype to "click" keyword
            }
            if (typeof config.togglehtml == "undefined")
                config.htmlsetting = { location: "none" }
            else
                config.htmlsetting = { location: config.togglehtml[0], collapse: config.togglehtml[1], expand: config.togglehtml[2]} //store HTML settings as object properties
            config.oninit = (typeof config.oninit == "undefined") ? function() { } : config.oninit //attach custom "oninit" event handler
            config.onopenclose = (typeof config.onopenclose == "undefined") ? function() { } : config.onopenclose //attach custom "onopenclose" event handler
            var lastexpanded = {} //object to hold reference to last expanded header and content (jquery objects)
            var expandedindices = ddaccordion.urlparamselect(config.headerclass) || ((config.persiststate && persistedheaders != null) ? persistedheaders : config.defaultexpanded)
            if (typeof expandedindices == 'string') //test for string value (exception is config.defaultexpanded, which is an array)
                expandedindices = expandedindices.replace(/c/ig, '').split(',') //transform string value to an array (ie: "c1,c2,c3" becomes [1,2,3]
            if (expandedindices.length == 1 && expandedindices[0] == "-1") //check for expandedindices value of [-1], indicating persistence is on and no content expanded
                expandedindices = []
            if (config["collapseprev"] && expandedindices.length > 1) //only allow one content open?
                expandedindices = [expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
            if (config["onemustopen"] && expandedindices.length == 0) //if at least one content should be open at all times and none are, open 1st header
                expandedindices = [0]
            $headers.each(function(index) { //loop through all headers
                var $header = $(this)
                if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $header.html() != "") { //add a SPAN element to header depending on user setting and if header is a container tag
                    $('<span class="accordprefix"></span>').prependTo(this)
                    $('<span class="accordsuffix"></span>').appendTo(this)
                }
                $header.attr('headerindex', index + 'h') //store position of this header relative to its peers
                $subcontents.eq(index).attr('contentindex', index + 'c') //store position of this content relative to its peers
                var $subcontent = $subcontents.eq(index)
                var $hiddenajaxlink = $subcontent.find('a.hiddenajaxlink:eq(0)') //see if this content should be loaded via ajax
                if ($hiddenajaxlink.length == 1) {
                    $header.data('ajaxinfo', { url: $hiddenajaxlink.attr('href'), cacheddata: null, status: 'none' }) //store info about this ajax content inside header
                }
                var needle = (typeof expandedindices[0] == "number") ? index : index + '' //check for data type within expandedindices array- index should match that type
                if (jQuery.inArray(needle, expandedindices) != -1) { //check for headers that should be expanded automatically (convert index to string first)
                    ddaccordion.expandit($header, $subcontent, config, false, false, !config.animatedefault) //3rd last param sets 'isuseractivated' parameter, 2nd last sets isdirectclick, last sets skipanimation param
                    lastexpanded = { $header: $header, $content: $subcontent }
                }  //end check
                else {
                    $subcontent.hide()
                    config.onopenclose($header.get(0), parseInt($header.attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
                    ddaccordion.transformHeader($header, config, "collapse")
                }
            })


            $headers.bind("evt_accordion", function(e, isdirectclick) { //assign CUSTOM event handler that expands/ contacts a header
                var $subcontent = $subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed

                // Dan's amend - checks if the item is in the left and nav and has no children. If so it returns true to follow the link url
                // Otherwise it just opens the accordion content 
                temp = $subcontent[0];
                if (($(this).parents('.leftMenuItemHeader').length > 0 || $(this).hasClass('leftMenuItemHeader')) && $('a', temp).length == 0) {
                    
                    //Get the link url and follow it
                    headingLink = $('a', this)[0];
                    headingLinkUrl = $(headingLink).attr('href');
                    if (headingLinkUrl != "" && headingLinkUrl != null) window.location = headingLinkUrl;
                    return true;

                } else {

                    if ($subcontent.css('display') == "none") {
                        ddaccordion.expandit($(this), $subcontent, config, true, isdirectclick) //2nd last param sets 'isuseractivated' parameter
                        if (config["collapseprev"] && lastexpanded.$header && $(this).get(0) != lastexpanded.$header.get(0)) { //collapse previous content?
                            ddaccordion.collapseit(lastexpanded.$header, lastexpanded.$content, config, true) //Last Boolean value sets 'isuseractivated' parameter
                        }
                        lastexpanded = { $header: $(this), $content: $subcontent }
                    }
                    else if (!config["onemustopen"] || config["onemustopen"] && lastexpanded.$header && $(this).get(0) != lastexpanded.$header.get(0)) {
                        ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
                    }

                }
            })
            $headers.bind(config.revealtype, function() {
                if (config.revealtype == "mouseenter") {
                    clearTimeout(config.revealdelay)
                    var headerindex = parseInt($(this).attr("headerindex"))
                    config.revealdelay = setTimeout(function() { ddaccordion.expandone(config["headerclass"], headerindex) }, config.mouseoverdelay || 0)
                }
                else {
                    $(this).trigger("evt_accordion", [true]) //last parameter indicates this is a direct click on the header
                    return false //cancel default click behavior
                }
            })
            $headers.bind("mouseleave", function() {
                clearTimeout(config.revealdelay)
            })
            config.oninit($headers.get(), expandedindices)
            $(window).bind('unload', function() { //clean up and persist on page unload
                $headers.unbind()
                var expandedindices = []
                $subcontents.filter(':visible').each(function(index) { //get indices of expanded headers
                    expandedindices.push($(this).attr('contentindex'))
                })
                if (config.persiststate == true && $headers.length > 0) { //persist state?
                    expandedindices = (expandedindices.length == 0) ? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
                    ddaccordion.setCookie(config.headerclass, expandedindices)
                }
            })
        })
    }
}

//preload any images defined inside ajaxloadingmsg variable
ddaccordion.preloadimages(jQuery(ddaccordion.ajaxloadingmsg).filter('img'))