//** Step Carousel Viewer- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Script Download/ http://www.dynamicdrive.com/dynamicindex4/stepcarousel.htm
//** Usage Terms: http://www.dynamicdrive.com/notice.htm
//** Current version (Sept 29th, 09'): 1.8 See http://www.dynamicdrive.com/dynamicindex4/stepcarouselchangelog.txt for details


//jQuery.noConflict();

var property_ = $;

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(property_, config){ //function to fetch external page containing the panel DIVs
		config.property_belt.html(this.ajaxloadingmsg);
		property_.ajax({
			url: config.contenttype[1], //path to external content
			async: true,
			error:function(ajaxrequest){
				config.property_belt.html('Error fetching content.<br />Server Response: '+ajaxrequest.responseText);
			},
			success:function(content){
				config.property_belt.html(content);
				config.property_panels=config.property_gallery.find('.'+config.panelclass);
				stepcarousel.alignpanels(property_, 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.property_leftnavbutton.fadeTo('fast', currentpanel==0? this.defaultbuttonsfade : 1);
		config.property_rightnavbutton.fadeTo('fast', currentpanel==config.lastvisiblepanel? this.defaultbuttonsfade : 1);
		if (currentpanel==config.lastvisiblepanel){
			stepcarousel.stopautostep(config);
		}

	},

	addnavbuttons:function(property_, config, currentpanel){
		config.property_leftnavbutton=property_('<img 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.property_rightnavbutton=property_('<img src="'+config.defaultbuttons.rightnav[0]+'">').css({zIndex:50, position:'absolute', left:config.offsets.left+config.property_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.property_leftnavbutton.bind('click', function(){ //assign nav button event handlers
			stepcarousel.stepBy(config.galleryid, -config.defaultbuttons.moveby);
		});
		config.property_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);
		}
		return config.property_leftnavbutton.add(config.property_rightnavbutton);
	},

	alignpanels:function(property_, 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.property_panels.each(function(index){ //loop through panels
			var property_currentpanel=property_(this);
			property_currentpanel.css({float: 'none', position: 'absolute', left: paneloffset+'px'}); //position panel
			property_currentpanel.bind('click', function(e){return config.onpanelclick(e.target);}); //bind onpanelclick() to onclick event
			paneloffset+=stepcarousel.getCSSValue(property_currentpanel.css('marginRight')) + parseInt(property_currentpanel.get(0).offsetWidth || property_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.property_panels.length-1;
		config.lastvisiblepanel=lastpanelindex;
		for (var i=config.property_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.property_belt.css({width: paneloffset+'px'}); //Set Belt DIV to total panels' widths
		config.currentpanel=(config.panelbehavior.persist)? parseInt(this.getCookie(config.galleryid+"persist")) : 0; //determine 1st panel to show by default
		config.currentpanel=(typeof config.currentpanel=="number" && config.currentpanel<config.property_panels.length)? config.currentpanel : 0;
		var endpoint=config.paneloffsets[config.currentpanel]+(config.currentpanel==0? 0 : config.beltoffset);
		config.property_belt.css({left: -endpoint+'px'});
		if (config.defaultbuttons.enable==true){ //if enable default back/forth nav buttons
			var property_navbuttons=this.addnavbuttons(property_, config, config.currentpanel);
			property_(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.property_gallery.get(0), "offsetLeft"), top:stepcarousel.getoffset(config.property_gallery.get(0), "offsetTop")};
				config.property_leftnavbutton.css({left:config.offsets.left+config.defaultbuttons.leftnav[1]+'px', top:config.offsets.top+config.defaultbuttons.leftnav[2]+'px'});
				config.property_rightnavbutton.css({left:config.offsets.left+config.property_gallery.get(0).offsetWidth+config.defaultbuttons.rightnav[1]+'px', top:config.offsets.top+config.defaultbuttons.rightnav[2]+'px'});
			});
		}
		if (config.autostep && config.autostep.enable){ //enable auto stepping of Carousel?		
			var property_carouselparts=config.property_gallery.add(typeof property_navbuttons!="undefined"? property_navbuttons : null);
			property_carouselparts.bind('click', function(){
				config.autostep.status="stopped";
				stepcarousel.stopautostep(config);
			});
			property_carouselparts.hover(function(){ //onMouseover
				stepcarousel.stopautostep(config);
				config.autostep.hoverstate="over";
			}, function(){ //onMouseout
				if (config.steptimer && config.autostep.hoverstate=="over" && config.autostep.status!="stopped"){
					config.steptimer=setInterval(function(){stepcarousel.autorotate(config.galleryid);}, config.autostep.pause);
					config.autostep.hoverstate="out";
				}
			});
			config.steptimer=setInterval(function(){stepcarousel.autorotate(config.galleryid);}, config.autostep.pause); //automatically rotate Carousel Viewer
		} //end enable auto stepping check
		this.createpaginate(property_, config);
		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;
		}
		stepcarousel.stopautostep(config);
		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.property_belt.animate({left: -endpoint+'px'}, config.panelbehavior.speed, function(){config.onslideaction(this);});
		config.currentpanel=pindex;
		this.statusreport(galleryid);
	},

	stepBy:function(galleryid, steps, isauto){
		var config=stepcarousel.configholder[galleryid];
		if (typeof config=="undefined"){
			//alert("There's an error with your set up of Carousel Viewer \""+galleryid+ "\"!")
			return;
		}
		if (!isauto) //if stepBy() function isn't called by autorotate() function
			stepcarousel.stopautostep(config);
		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
			if (pindex>config.lastvisiblepanel && direction=="forward"){
				//if destination pindex is greater than last visible panel, yet we're currently not at the end of the carousel yet
				pindex=(config.currentpanel<config.lastvisiblepanel)? config.lastvisiblepanel : 0;
			}
			else if (pindex<0 && direction=="back"){
				//if destination pindex is less than 0, yet we're currently not at the beginning of the carousel yet
				pindex=(config.currentpanel>0)? 0 : config.lastvisiblepanel; /*wrap around left*/
			}
		}
		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.property_belt.animate({left: -config.paneloffsets[config.currentpanel]-(direction=='forward'? 100 : -30)+'px'}, 'normal', function(){
				config.property_belt.animate({left: -endpoint+'px'}, config.panelbehavior.speed, function(){config.onslideaction(this);});
			});
		}
		else
			config.property_belt.animate({left: -endpoint+'px'}, config.panelbehavior.speed, function(){config.onslideaction(this);});
		config.currentpanel=pindex;
		this.statusreport(galleryid);
	},

	autorotate:function(galleryid){
		var config=stepcarousel.configholder[galleryid];
		this.stepBy(galleryid, config.autostep.moveby, true);
	},

	stopautostep:function(config){
		clearTimeout(config.steptimer);
	},

	statusreport:function(galleryid){
		var config=stepcarousel.configholder[galleryid];
		if (config.statusvars.length==3){ //if 3 status vars defined
			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.property_statusobjs[i].text(valuearray[i]+" "); //Populate element on page with ID="user specified name" with one of the status values
			}
		}
		stepcarousel.selectpaginate($, galleryid);
	},

	createpaginate:function(property_, config){
		if (config.property_paginatediv.length==1){
			var property_templateimg=config.property_paginatediv.find('img["data-over"]:eq(0)'); //reference first matching image on page
			var controlpoints=[], controlsrc=[], imgarray=[], moveby=property_templateimg.attr("data-moveby") || 1;
			var asize=(moveby==1? 0:1) + Math.floor((config.lastvisiblepanel+1) / moveby); //calculate # of pagination links to create
			var imghtml=property_('<div>').append(property_templateimg.clone()).html(); //get HTML of first matching image
			srcs=[property_templateimg.attr('src'), property_templateimg.attr('data-over'), property_templateimg.attr('data-select')]; //remember control's over and out, and selected image src
			for (var i=0; i<asize; i++){
				var moveto=Math.min(i*moveby, config.lastvisiblepanel);
				imgarray.push(imghtml.replace(/>property_/, ' data-index="'+i+'" data-moveto="'+moveto+'" title="Move to Panel '+(moveto+1)+'">') +'\n');
				controlpoints.push(moveto); //store panel index each control goes to when clicked on
			}
			var property_controls=property_('<span></span>').replaceAll(property_templateimg).append(imgarray.join('')).find('img'); //replace template link with links and return them
			property_controls.css({cursor:'pointer'});
			config.property_paginatediv.bind('click', function(e){
				var property_target=property_(e.target);
				if (property_target.is('img') && property_target.attr('data-over')){
					stepcarousel.stepTo(config.galleryid, parseInt(property_target.attr('data-moveto'))+1);
				}
			});
			config.property_paginatediv.bind('mouseover mouseout', function(e){
				var property_target=property_(e.target);
				if (property_target.is('img') && property_target.attr('data-over')){
					if (parseInt(property_target.attr('data-index')) != config.pageinfo.curselected) //if this isn't the selected link
						property_target.attr('src', srcs[(e.type=="mouseover")? 1 : 0]);
				}
			});
			config.pageinfo={controlpoints:controlpoints, property_controls:property_controls,  srcs:srcs, prevselected:null, curselected:null};
		}
	},

	
	selectpaginate:function(property_, galleryid){
		var config=stepcarousel.configholder[galleryid];
		if (config.property_paginatediv.length==1){
			for (var i=0; i<config.pageinfo.controlpoints.length; i++){
				if (config.pageinfo.controlpoints[i] <= config.currentpanel) //find largest control point that's less than or equal to current panel shown
					config.pageinfo.curselected=i;
			}
			if (typeof config.pageinfo.prevselected!=null) //deselect previously selected link (if found)
				config.pageinfo.property_controls.eq(config.pageinfo.prevselected).attr('src', config.pageinfo.srcs[0]);
			config.pageinfo.property_controls.eq(config.pageinfo.curselected).attr('src', config.pageinfo.srcs[2]); //select current paginate link
			config.pageinfo.prevselected=config.pageinfo.curselected; //set current selected link to previous
		}
	},


	loadcontent:function(galleryid, url){
		var config=stepcarousel.configholder[galleryid];
		config.contenttype=['ajax', url];
		stepcarousel.stopautostep(config);
		stepcarousel.resetsettings(property_, config);
		stepcarousel.init($, config);

	},

	init:function(property_, config){
		config.gallerywidth=config.property_gallery.width();
		config.offsets={left:stepcarousel.getoffset(config.property_gallery.get(0), "offsetLeft"), top:stepcarousel.getoffset(config.property_gallery.get(0), "offsetTop")};
		config.property_belt=config.property_gallery.find('.'+config.beltclass); //Find Belt DIV that contains all the panels
		config.property_panels=config.property_gallery.find('.'+config.panelclass); //Find Panel DIVs that each contain a slide
		config.property_paginatediv=property_('#'+config.galleryid+'-paginate'); //get pagination DIV (if defined)
		if (config.autostep)
			config.autostep.pause+=config.panelbehavior.speed;
		config.onpanelclick=(typeof config.onpanelclick=="undefined")? function(target){} : config.onpanelclick; //attach custom "onpanelclick" event handler
		config.onslideaction=(typeof config.onslide=="undefined")? function(){} : function(beltobj){property_(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.property_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.property_statusobjs=[property_('#'+config.statusvars[0]), property_('#'+config.statusvars[1]), property_('#'+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(property_, config);
		else
			stepcarousel.alignpanels(property_, config); //align panels and initialize gallery
	},

	resetsettings:function(property_, config){
		config.property_gallery.unbind();
		config.property_belt.stop();
		config.property_panels.remove();
		if (config.property_leftnavbutton){
			config.property_leftnavbutton.remove();
			config.property_rightnavbutton.remove();
		}
		if (config.property_paginatediv.length==1){
			config.property_paginatediv.unbind();
			config.pageinfo.property_controls.eq(0).attr('src', config.pageinfo.srcs[0]).removeAttr('data-index').removeAttr('data-moveto').removeAttr('title') //reset first pagination link so it acts as template again
			.end().slice(1).remove(); //then remove all but first pagination link
		}
		if (config.autostep)
			config.autostep.status=null;
		if (config.panelbehavior.persist){
			stepcarousel.setCookie(window[config.galleryid+"persist"], 0); //set initial panel to 0, overridden w/ current panel if window.unload is invoked
		}
	},

	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>');
		$(document).ready(function(property_){
			config.property_gallery=property_('#'+config.galleryid);
			stepcarousel.init(property_, config);
		}); //end document.ready
		$(window).bind('unload', function(){ //clean up on page unload
			stepcarousel.resetsettings(property_, config);
			if (config.panelbehavior.persist)
				stepcarousel.setCookie(config.galleryid+"persist", config.currentpanel);
			$.each(config, function(ai, oi){
				oi=null;
			});
			config=null;
		});
	}
};