//** Accordion Content script: By Dynamic Drive, at http://www.dynamicdrive.com
//** Created: Jan 7th, 08'

//Version 1.3: April 3rd, 08':
//**1) Script now no longer conflicts with other JS frameworks
//**2) Adds custom oninit() and onopenclose() event handlers that fire when Accordion Content instance has initialized, plus whenever a header is opened/closed
//**3) Adds support for expanding header(s) using the URL parameter (ie: http://mysite.com/accordion.htm?headerclass=0,1)

//April 9th, 08': Fixed "defaultexpanded" setting not working when page first loads

//Version 1.4: June 4th, 08':
//**1) Added option to activate a header "mouseover" instead of the default "click"
//**2) Bug persistence not working when used with jquery 1.2.6

//Version 1.5: June 20th, 08':
//**1) Adds new "onemustopen:true/false" parameter, which lets you set whether at least one header should be open at all times (so never all closed).
//**2) Changed cookie path to site wide for persistence feature
//**3) Fixed bug so "expandedindices" parameter in oninit(headers, expandedindices) returns empty array [] instead of [-1] when no expanded headers found

//**1) Version 1.5.1: June 27th, 08': Fixed "defaultexpanded" setting not working properly when used with jquery 1.2.6

//Version 1.6: Oct 3rd, 08':
//**1) Adds new "mouseoverdelay" param that sets delay before headers are activated when "revealtype" param is set to "mouseover"
//**2) Fixed bug with "onemustopen" param not working properly when "revealtype" is set to "click"

//Version 1.7: March 24th, 09': Adds a 3rd revealtype setting "clickgo", which causes browser to navigate to URL specified inside the header after expanding its contents.

//Version 1.7.1: May 28th, 09': Fixed issue that causes margins/paddings in accordion DIVs to be lost in IE8


var ddaccordion={
	
    contentclassname:{}, //object to store corresponding contentclass name based on headerclass

    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 $=jQuery
        var $headers=$('.'+headerclass)
        $('.'+this.contentclassname[headerclass]+':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 $=jQuery
        var $headers=$('.'+headerclass)
        $('.'+this.contentclassname[headerclass]+':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 $=jQuery
        var $targetHeader=$('.'+headerclass).eq(selected)
        var $subcontent=$('.'+this.contentclassname[headerclass]).eq(selected)
        if (typeof optstate=="undefined" || optstate=="expand" && $subcontent.is(":hidden") || optstate=="collapse" && $subcontent.is(":visible"))
            $targetHeader.trigger("evt_accordion")
    },

    expandit:function($targetHeader, $targetContent, config, useractivated, directclick){
        this.transformHeader($targetHeader, config, "expand")
        $targetContent.slideDown(config.animatespeed, function(){
            config.onopenclose($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('<\/style>')
        jQuery(document).ready(function($){
            ddaccordion.urlparamselect(config.headerclass)
            var persistedheaders=ddaccordion.getCookie(config.headerclass)
            ddaccordion.contentclassname[config.headerclass]=config.contentclass //remember contentclass name based on 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]
            var $subcontents=$('.'+config["contentclass"])
            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]
            $('.'+config["headerclass"]).each(function(index){ //loop through all headers
                if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $(this).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)
                }
                $(this).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 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)
                    if (config.animatedefault==false)
                        $subcontent.show()
                    ddaccordion.expandit($(this), $subcontent, config, false) //Last param sets 'isuseractivated' parameter
                    lastexpanded={
                        $header:$(this),
                        $content:$subcontent
                    }
                }  //end check
                else{
                    $subcontent.hide()
                    config.onopenclose($(this).get(0), parseInt($(this).attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
                    ddaccordion.transformHeader($(this), config, "collapse")
                }
            })
            $('.'+config["headerclass"]).bind("evt_accordion", function(e, isdirectclick){ //assign custom event handler that expands/ contacts a header
                var $subcontent=$subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed
                if ($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
                }
            })
            $('.'+config["headerclass"]).bind(config.revealtype, function(){
                if (config.revealtype=="mouseenter"){
                    clearTimeout(config.revealdelay)
                    var headerindex=parseInt($(this).attr("headerindex"))
                    config.revealdelay=setTimeout(function(){
                        ddaccordion.expandone(config["headerclass"], headerindex)
                        }, config.mouseoverdelay || 0)
                }
                else{
                    $(this).trigger("evt_accordion", [true])
                    return false //cancel default click behavior
                }
            })
            $('.'+config["headerclass"]).bind("mouseleave", function(){
                clearTimeout(config.revealdelay)
            })
            config.oninit($('.'+config["headerclass"]).get(), expandedindices)
            $(window).bind('unload', function(){ //clean up and persist on page unload
                $('.'+config["headerclass"]).unbind()
                var expandedindices=[]
                $('.'+config["contentclass"]+":visible").each(function(index){ //get indices of expanded headers
                    expandedindices.push($(this).attr('contentindex'))
                })
                if (config.persiststate==true && $('.'+config["headerclass"]).length>0){ //persist state?
                    expandedindices=(expandedindices.length==0)? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
                    ddaccordion.setCookie(config.headerclass, expandedindices)
                }
            })
        })
    }
}