//Featured Content Glider: By http://www.dynamicdrive.com
//Created: Dec 22nd, 07'
//Updated (Jan 29th, 08): Added four possible slide directions: "updown", "downup", "leftright", or "rightleft"
//Updated (Feb 1st, 08): Changed glide behavior to reverse direction when previous button is clicked
//Updated (Feb 12th, 08): Added ability to retrieve gliding contents from an external file using Ajax ("remotecontent" variable added to configuration)

var featuredcontentglider = {
    csszindex: 100,
    ajaxloadingmsg: '<b>Fetching Content. Please wait...</b>',
    glide: function(config, showpage, isprev) {
        var selected = parseInt(showpage)
        if (selected >= config.$contentdivs.length) { //if no content exists at this index position
            alert("No content exists at page " + (selected + 1) + "! Loading 1st page instead.")
            selected = 0
        }
        var $target = config.$contentdivs.eq(selected)
        //Test for toggler not being initialized yet, or user clicks on the currently selected page):
        if (config.$togglerdiv.attr('lastselected') == null || parseInt(config.$togglerdiv.attr('lastselected')) != selected) {
            var $selectedlink = config.$toc.eq(selected)
            config.$next.attr('loadpage', (selected < config.$contentdivs.length - 1) ? selected + 1 + 'pg' : 0 + 'pg')
            config.$prev.attr('loadpage', (selected == 0) ? config.$contentdivs.length - 1 + 'pg' : selected - 1 + 'pg')
            var startpoint = (isprev == "previous") ? -config.startpoint : config.startpoint
            $target.css(config.leftortop, startpoint).css("zIndex", this.csszindex++) //hide content so it's just out of view before animating it
            var endpoint = (config.leftortop == "left") ? { left: 0} : { top: 0} //animate it into view
            $target.animate(endpoint, config.speed)
            config.$toc.removeClass('selected')
            $selectedlink.addClass('selected')
            config.$togglerdiv.attr('lastselected', selected + 'pg')
        }
    },

    getremotecontent: function(config) {
        config.$glider.html(this.ajaxloadingmsg)
        $.ajax({
            url: config.remotecontent,
            error: function(ajaxrequest) {
                config.$glider.html('Error fetching content.<br />Server Response: ' + ajaxrequest.responseText)
            },
            success: function(content) {
                config.$glider.html(content)
                featuredcontentglider.setuptoggler(config)
            }
        })
    },

    aligncontents: function(config) {
        config.$contentdivs = $("#" + config.gliderid + " ." + config.contentclass)
        config.$contentdivs.css(config.leftortop, config.startpoint).css({ height: config.$glider.height(), visibility: 'visible' }) //position content divs so they're out of view:
    },

    setuptoggler: function(config) {
        this.aligncontents(config)
        config.$togglerdiv.hide()
        config.$toc.each(function(index) {
            $(this).attr('pagenumber', index + 'pg')
            if (index > (config.$contentdivs.length - 1))
                $(this).css({ display: 'none' }) //hide redundant "toc" links
        })
        var $nextandprev = $("#" + config.togglerid + " .next, #" + config.togglerid + " .prev")
        $nextandprev.click(function(event) { //Assign click behavior to 'next' and 'prev' links
            featuredcontentglider.glide(config, this.getAttribute('loadpage'), this.getAttribute('buttontype'))
            event.preventDefault() //cancel default link action
        })
        config.$toc.click(function(event) { //Assign click behavior to 'toc' links
            featuredcontentglider.glide(config, this.getAttribute('pagenumber'))
            event.preventDefault()
        })
        config.$togglerdiv.fadeIn(1000, function() {
            featuredcontentglider.glide(config, config.selected)
            if (config.autorotate == true) { //auto rotate contents?
                config.stepcount = 0 //set steps taken
                config.totalsteps = config.$contentdivs.length * config.autorotateconfig[1] //Total steps limit: num of contents x num of user specified cycles)
                featuredcontentglider.autorotate(config)
            }
        })
        config.$togglerdiv.click(function() {
            featuredcontentglider.cancelautorotate(config.togglerid)
        })
    },

    autorotate: function(config) {
        var rotatespeed = config.speed + config.autorotateconfig[0]
        window[config.togglerid + "timer"] = setInterval(function() {
            if (config.totalsteps > 0 && config.stepcount >= config.totalsteps) {
                clearInterval(window[config.togglerid + "timer"])
            }
            else {
                config.$next.click()
                config.stepcount++
            }
        }, rotatespeed)
    },

    cancelautorotate: function(togglerid) {
        if (window[togglerid + "timer"])
            clearInterval(window[togglerid + "timer"])
    },

    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) {
        $(document).ready(function() {
            config.$glider = $("#" + config.gliderid)
            config.$togglerdiv = $("#" + config.togglerid)
            config.$toc = config.$togglerdiv.children('.toc')
            config.$next = config.$togglerdiv.children('.next')
            config.$prev = config.$togglerdiv.children('.prev')
            config.$prev.attr('buttontype', 'previous')
            var selected = (config.persiststate) ? featuredcontentglider.getCookie(config.gliderid) : config.selected
            config.selected = (isNaN(parseInt(selected))) ? config.selected : selected //test for cookie value containing null (1st page load) or "undefined" string	
            config.leftortop = (/up/i.test(config.direction)) ? "top" : "left" //set which CSS property to manipulate based on "direction"
            config.heightorwidth = (/up/i.test(config.direction)) ? config.$glider.height() : config.$glider.width() //Get glider height or width based on "direction"
            config.startpoint = (/^(left|up)/i.test(config.direction)) ? -config.heightorwidth : config.heightorwidth //set initial position of contents based on "direction"
            if (typeof config.remotecontent != "undefined" && config.remotecontent.length > 0)
                featuredcontentglider.getremotecontent(config)
            else
                featuredcontentglider.setuptoggler(config)
            $(window).bind('unload', function() { //clean up and persist
                config.$togglerdiv.unbind('click')
                config.$toc.unbind('click')
                config.$next.unbind('click')
                config.$prev.unbind('click')
                if (config.persiststate)
                    featuredcontentglider.setCookie(config.gliderid, config.$togglerdiv.attr('lastselected'))
                config = null

            })
        })
    }
}

var stepcarousel = {
    ajaxloadingmsg: '<div style="margin: 1em; font-weight: bold"><img src="ajaxloadr.gif" style="vertical-align: middle" /> Fetching Content. Please wait...</div>', //customize HTML to show while fetching Ajax content
    defaultbuttonsfade: 0.4, //Fade degree for disabled nav buttons (0=completely transparent, 1=completely opaque)
    configholder: {},

    getCSSValue: function(val) { //Returns either 0 (if val contains 'auto') or val as an integer
        return (val == "auto") ? 0 : parseInt(val)
    },

    getremotepanels: function($, config) { //function to fetch external page containing the panel DIVs
        config.$belt.html(this.ajaxloadingmsg)
        $.ajax({
            url: config.contenttype[1], //path to external content
            async: true,
            error: function(ajaxrequest) {
                config.$belt.html('Error fetching content.<br />Server Response: ' + ajaxrequest.responseText)
            },
            success: function(content) {
                config.$belt.html(content)
                config.$panels = config.$gallery.find('.' + config.panelclass)
                stepcarousel.alignpanels($, config)
            }
        })
    },

    getoffset: function(what, offsettype) {
        return (what.offsetParent) ? what[offsettype] + this.getoffset(what.offsetParent, offsettype) : what[offsettype]
    },

    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
    },

    fadebuttons: function(config, currentpanel) {
        config.$leftnavbutton.fadeTo('fast', currentpanel == 0 ? this.defaultbuttonsfade : 1)
        config.$rightnavbutton.fadeTo('fast', currentpanel == config.lastvisiblepanel ? this.defaultbuttonsfade : 1)
    },

    addnavbuttons: function(config, currentpanel) {
        config.$leftnavbutton = $('<img id="' + config.defaultbuttons.leftnav[3] + '" src="' + config.defaultbuttons.leftnav[0] + '">').css({ zIndex: 50, position: 'absolute', left: config.offsets.left + config.defaultbuttons.leftnav[1] + 'px', top: config.offsets.top + config.defaultbuttons.leftnav[2] + 'px', cursor: 'hand', cursor: 'pointer' }).attr({ title: 'Back ' + config.defaultbuttons.moveby + ' panels' }).appendTo('body')
        config.$rightnavbutton = $('<img id="' + config.defaultbuttons.rightnav[3] + '" src="' + config.defaultbuttons.rightnav[0] + '">').css({ zIndex: 50, position: 'absolute', left: config.offsets.left + config.$gallery.get(0).offsetWidth + config.defaultbuttons.rightnav[1] + 'px', top: config.offsets.top + config.defaultbuttons.rightnav[2] + 'px', cursor: 'hand', cursor: 'pointer' }).attr({ title: 'Forward ' + config.defaultbuttons.moveby + ' panels' }).appendTo('body')
        config.$leftnavbutton.bind('click', function() { //assign nav button event handlers
            stepcarousel.stepBy(config.galleryid, -config.defaultbuttons.moveby)
        })
        config.$rightnavbutton.bind('click', function() { //assign nav button event handlers
            stepcarousel.stepBy(config.galleryid, config.defaultbuttons.moveby)
        })
        if (config.panelbehavior.wraparound == false) { //if carousel viewer should stop at first or last panel (instead of wrap back or forth)
            this.fadebuttons(config, currentpanel)
        }
    },

    alignpanels: function($, config) {
        var paneloffset = 0
        config.paneloffsets = [paneloffset] //array to store upper left offset of each panel (1st element=0)
        config.panelwidths = [] //array to store widths of each panel
        config.$panels.each(function(index) { //loop through panels
            var $currentpanel = $(this)
            $currentpanel.css({ float: 'none', position: 'absolute', left: paneloffset + 'px' }) //position panel
            $currentpanel.bind('click', function(e) { return config.onpanelclick(e.target) }) //bind onpanelclick() to onclick event
            paneloffset += stepcarousel.getCSSValue($currentpanel.css('marginRight')) + parseInt($currentpanel.get(0).offsetWidth || $currentpanel.css('width')) //calculate next panel offset
            config.paneloffsets.push(paneloffset) //remember this offset
            config.panelwidths.push(paneloffset - config.paneloffsets[config.paneloffsets.length - 2]) //remember panel width
        })
        config.paneloffsets.pop() //delete last offset (redundant)
        var addpanelwidths = 0
        var lastpanelindex = config.$panels.length - 1
        config.lastvisiblepanel = lastpanelindex
        for (var i = config.$panels.length - 1; i >= 0; i--) {
            addpanelwidths += (i == lastpanelindex ? config.panelwidths[lastpanelindex] : config.paneloffsets[i + 1] - config.paneloffsets[i])
            if (config.gallerywidth > addpanelwidths) {
                config.lastvisiblepanel = i //calculate index of panel that when in 1st position reveals the very last panel all at once based on gallery width
            }
        }
        config.$belt.css({ width: paneloffset + 'px' }) //Set Belt DIV to total panels' widths
        config.currentpanel = (config.panelbehavior.persist) ? parseInt(this.getCookie(window[config.galleryid + "persist"])) : 0 //determine 1st panel to show by default
        config.currentpanel = (typeof config.currentpanel == "number" && config.currentpanel < config.$panels.length) ? config.currentpanel : 0
        if (config.currentpanel != 0) {
            var endpoint = config.paneloffsets[config.currentpanel] + (config.currentpanel == 0 ? 0 : config.beltoffset)
            config.$belt.css({ left: -endpoint + 'px' })
        }
        if (config.defaultbuttons.enable == true) { //if enable default back/forth nav buttons
            this.addnavbuttons(config, config.currentpanel)
            $(window).bind("load, resize", function() { //refresh position of nav buttons when page loads/resizes, in case offsets weren't available document.oncontentload
                config.offsets = { left: stepcarousel.getoffset(config.$gallery.get(0), "offsetLeft"), top: stepcarousel.getoffset(config.$gallery.get(0), "offsetTop") }
                config.$leftnavbutton.css({ left: config.offsets.left + config.defaultbuttons.leftnav[1] + 'px', top: config.offsets.top + config.defaultbuttons.leftnav[2] + 'px' })
                config.$rightnavbutton.css({ left: config.offsets.left + config.$gallery.get(0).offsetWidth + config.defaultbuttons.rightnav[1] + 'px', top: config.offsets.top + config.defaultbuttons.rightnav[2] + 'px' })
            })
        }
        this.statusreport(config.galleryid)
        config.oninit()
        config.onslideaction(this)
    },

    stepTo: function(galleryid, pindex) { /*User entered pindex starts at 1 for intuitiveness. Internally pindex still starts at 0 */
        var config = stepcarousel.configholder[galleryid]
        if (typeof config == "undefined") {
            alert("There's an error with your set up of Carousel Viewer \"" + galleryid + "\"!")
            return
        }
        var pindex = Math.min(pindex - 1, config.paneloffsets.length - 1)
        var endpoint = config.paneloffsets[pindex] + (pindex == 0 ? 0 : config.beltoffset)
        if (config.panelbehavior.wraparound == false && config.defaultbuttons.enable == true) { //if carousel viewer should stop at first or last panel (instead of wrap back or forth)
            this.fadebuttons(config, pindex)
        }
        config.$belt.animate({ left: -endpoint + 'px' }, config.panelbehavior.speed, function() { config.onslideaction(this) })
        config.currentpanel = pindex
        this.statusreport(galleryid)
    },

    stepBy: function(galleryid, steps) {
        var config = stepcarousel.configholder[galleryid]
        if (typeof config == "undefined") {
            alert("There's an error with your set up of Carousel Viewer \"" + galleryid + "\"!")
            return
        }
        var direction = (steps > 0) ? 'forward' : 'back' //If "steps" is negative, that means backwards
        var pindex = config.currentpanel + steps //index of panel to stop at
        if (config.panelbehavior.wraparound == false) { //if carousel viewer should stop at first or last panel (instead of wrap back or forth)
            pindex = (direction == "back" && pindex <= 0) ? 0 : (direction == "forward") ? Math.min(pindex, config.lastvisiblepanel) : pindex
            if (config.defaultbuttons.enable == true) { //if default nav buttons are enabled, fade them in and out depending on if at start or end of carousel
                stepcarousel.fadebuttons(config, pindex)
            }
        }
        else { //else, for normal stepBy behavior
            pindex = (pindex > config.paneloffsets.length - 1 || pindex < 0 && pindex - steps > 0) ? 0 : (pindex < 0) ? config.paneloffsets.length + steps : pindex //take into account end or starting panel and step direction
        }
        var endpoint = config.paneloffsets[pindex] + (pindex == 0 ? 0 : config.beltoffset) //left distance for Belt DIV to travel to
        if (pindex == 0 && direction == 'forward' || config.currentpanel == 0 && direction == 'back' && config.panelbehavior.wraparound == true) { //decide whether to apply "push pull" effect
            config.$belt.animate({ left: -config.paneloffsets[config.currentpanel] - (direction == 'forward' ? 100 : -30) + 'px' }, 'normal', function() {
                config.$belt.animate({ left: -endpoint + 'px' }, config.panelbehavior.speed, function() { config.onslideaction(this) })
            })
        }
        else
            config.$belt.animate({ left: -endpoint + 'px' }, config.panelbehavior.speed, function() { config.onslideaction(this) })
        config.currentpanel = pindex
        this.statusreport(galleryid)
    },

    statusreport: function(galleryid) {
        var config = stepcarousel.configholder[galleryid]
        var startpoint = config.currentpanel //index of first visible panel 
        var visiblewidth = 0
        for (var endpoint = startpoint; endpoint < config.paneloffsets.length; endpoint++) { //index (endpoint) of last visible panel
            visiblewidth += config.panelwidths[endpoint]
            if (visiblewidth > config.gallerywidth) {
                break
            }
        }
        startpoint += 1 //format startpoint for user friendiness
        endpoint = (endpoint + 1 == startpoint) ? startpoint : endpoint //If only one image visible on the screen and partially hidden, set endpoint to startpoint
        var valuearray = [startpoint, endpoint, config.panelwidths.length]
        for (var i = 0; i < config.statusvars.length; i++) {
            window[config.statusvars[i]] = valuearray[i] //Define variable (with user specified name) and set to one of the status values
            config.$statusobjs[i].text(valuearray[i] + " ") //Populate element on page with ID="user specified name" with one of the status values
        }
    },

    setup: function(config) {
        //Disable Step Gallery scrollbars ASAP dynamically (enabled for sake of users with JS disabled)
        document.write('<style type="text/css">\n#' + config.galleryid + '{overflow: hidden;}\n</style>')
        jQuery(document).ready(function($) {
            config.$gallery = $('#' + config.galleryid)
            config.gallerywidth = config.$gallery.width()
            config.offsets = { left: stepcarousel.getoffset(config.$gallery.get(0), "offsetLeft"), top: stepcarousel.getoffset(config.$gallery.get(0), "offsetTop") }
            config.$belt = config.$gallery.find('.' + config.beltclass) //Find Belt DIV that contains all the panels
            config.$panels = config.$gallery.find('.' + config.panelclass) //Find Panel DIVs that each contain a slide
            config.onpanelclick = (typeof config.onpanelclick == "undefined") ? function(target) { } : config.onpanelclick //attach custom "onpanelclick" event handler
            config.onslideaction = (typeof config.onslide == "undefined") ? function() { } : function(beltobj) { $(beltobj).stop(); config.onslide() } //attach custom "onslide" event handler
            config.oninit = (typeof config.oninit == "undefined") ? function() { } : config.oninit //attach custom "oninit" event handler
            config.beltoffset = stepcarousel.getCSSValue(config.$belt.css('marginLeft')) //Find length of Belt DIV's left margin
            config.statusvars = config.statusvars || []  //get variable names that will hold "start", "end", and "total" slides info
            config.$statusobjs = [$('#' + config.statusvars[0]), $('#' + config.statusvars[1]), $('#' + config.statusvars[2])]
            config.currentpanel = 0
            stepcarousel.configholder[config.galleryid] = config //store config parameter as a variable
            if (config.contenttype[0] == "ajax" && typeof config.contenttype[1] != "undefined") //fetch ajax content?
                stepcarousel.getremotepanels($, config)
            else
                stepcarousel.alignpanels($, config) //align panels and initialize gallery
        }) //end document.ready
        jQuery(window).bind('unload', function() { //clean up
            if (config.panelbehavior.persist) {
                stepcarousel.setCookie(window[config.galleryid + "persist"], config.currentpanel)
            }
            jQuery.each(config, function(ai, oi) {
                oi = null
            })
            config = null
        })
    }
}