//Step Carousel Viewer: By Dynamic Drive, at http://www.dynamicdrive.com
//Created: March 19th, 08'

jQuery.noConflict()

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
    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)
            }
        })
    },

    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($currentpanel.get(0).offsetWidth) //calculate next panel offset
            config.paneloffsets.push(paneloffset) //remember this offset
            config.panelwidths.push(paneloffset-config.paneloffsets[config.paneloffsets.length-2]) //remember panel width
        })
        config.paneloffsets.pop() //delete last offset (redundant)
        config.$belt.css({width: paneloffset+'px'}) //Set Belt DIV to total panels' widths
        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)
        config.$belt.animate({left: -endpoint+'px'}, 'slow', 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
        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'){ //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'}, 'slow', function(){config.onslideaction(this)})
            })
        }
        else
            config.$belt.animate({left: -endpoint+'px'}, 'slow', 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].html(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.$belt=config.$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
                
            jQuery("#resizebox .container").slideUp(1);
            jQuery("#resizebox").hover(function(){
                $("#resizebox .container").slideDown(200);
            },function(){
                $("#resizebox .container").slideUp(200);
            });
        }) //end document.ready
        jQuery(window).bind('unload', function(){ //clean up
            jQuery.each(config, function(ai, oi){
                oi=null
            })
            config=null
        })
    }
}