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

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 $headers = $('.' + headerclass)
        $('.' + this.contentclassname[headerclass] + ':hidden').each(function() {
            $headers.eq(parseInt($(this).attr('contentindex'))).click()
        })
    },

    collapseall: function(headerclass) { //PUBLIC function to collapse all headers based on their shared CSS classname
        var $headers = $('.' + headerclass)
        $('.' + this.contentclassname[headerclass] + ':visible').each(function() {
            $headers.eq(parseInt($(this).attr('contentindex'))).click()
        })
    },

    toggleone: function(headerclass, selected, optstate) { //PUBLIC function to expand/ collapse a particular header
        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.click()
    },

    expandit: function($targetHeader, $targetContent, config) {
        $targetContent.slideDown(config.animatespeed)
        this.transformHeader($targetHeader, config, "expand")
    },

    collapseit: function($targetHeader, $targetContent, config) {
        $targetContent.slideUp(config.animatespeed)
        this.transformHeader($targetHeader, config, "collapse")
    },

    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)
    },

    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
    },

    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>')
        $(document).ready(function() {
            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.htmlsetting = { location: config.togglehtml[0], collapse: config.togglehtml[1], expand: config.togglehtml[2]} //store HTML settings as object properties
            var lastexpanded = {} //object to hold reference to last expanded header and content (jquery objects)
            var expandedindices = (config.persiststate) ? ddaccordion.getCookie(config.headerclass) : config.defaultexpanded
            expandedindices = (typeof expandedindices == 'string') ? expandedindices.replace(/c/ig, '').split(',') : config.defaultexpanded //test for valid cookie ('string'), otherwise (null, or 1st page load), default to defaultexpanded setting
            var $subcontents = $('.' + config["contentclass"])
            if (config["collapseprev"] && expandedindices.length > 1)
                expandedindices = [expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
            $('.' + 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)
                if (jQuery.inArray(index, expandedindices) != -1) { //check for headers that should be expanded automatically
                    if (config.animatedefault == false)
                        $subcontent.show()
                    ddaccordion.expandit($(this), $subcontent, config)
                    lastexpanded = { $header: $(this), $content: $subcontent }
                }  //end check
                else {
                    $subcontent.hide()
                    ddaccordion.transformHeader($(this), config, "collapse")
                }
            })
            $('.' + config["headerclass"]).click(function() { //assign behavior when headers are clicked on
                var $subcontent = $subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed
                if ($subcontent.css('display') == "none") {
                    ddaccordion.expandit($(this), $subcontent, config)
                    if (config["collapseprev"] && lastexpanded.$header && $(this).get(0) != lastexpanded.$header.get(0)) { //collapse previous content?
                        ddaccordion.collapseit(lastexpanded.$header, lastexpanded.$content, config)
                    }
                    lastexpanded = { $header: $(this), $content: $subcontent }
                }
                else {
                    ddaccordion.collapseit($(this), $subcontent, config)
                }
                return false
            })
            $(window).bind('unload', function() { //clean up and persist on page unload
                $('.' + config["headerclass"]).unbind('click')
                var expandedindices = []
                $('.' + config["contentclass"] + ":visible").each(function(index) { //get indices of expanded headers
                    expandedindices.push($(this).attr('contentindex'))
                })
                if (config.persiststate == true) { //persist state?
                    expandedindices = (expandedindices.length == 0) ? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
                    ddaccordion.setCookie(config.headerclass, expandedindices)
                }
            })
        })
    }
}