//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', display: 'block'}); //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;
		}

		document.getElementById(galleryid + 'LabelText' + (config.currentpanel + 1)).className = 'caroNavBarItem';
		document.getElementById(galleryid + 'RightEdge' + (config.currentpanel + 1)).className = 'rightEdgeEmpty';
		document.getElementById(galleryid + 'LabelText' + pindex).className = 'caroNavBarItemSelected';
		document.getElementById(galleryid + 'RightEdge' + pindex).className = 'rightEdge';
		
		var pindex2=Math.min(pindex-1, config.paneloffsets.length-1);
		var endpoint=config.paneloffsets[pindex2]+(pindex2===0? 0 : config.beltoffset);
		config.$belt.animate({left: -endpoint+'px'}, 'slow', function(){config.onslideaction(this);});
		config.currentpanel=pindex2;
		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+ "\"!");
			if (console && console.log) console.log("Error w/ Carousel: " + 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
			}
		}); //end document.ready
		jQuery(window).bind('unload', function(){ //clean up
			jQuery.each(config, function(ai, oi){
				oi=null;
			});
			config=null;
		});
	}
};