//** Simple Controls Gallery- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Dec 7th, 08'- Script created (Requires jquery 1.2.x)
//** February 6th, 09'- Updated to v 1.3:
	//1) Adds Description Panel to optionally show a textual description for each slide
	//2) In Auto Play mode, you can now set the number of cycles before gallery stops.
	//3) Inside oninit() and onslide(), keyword "this" now references the current gallery instance


function simpleGallery(settingarg){
	this.setting=settingarg
	settingarg=null
	var setting=this.setting
	setting.fadeduration=parseInt(setting.fadeduration)
	setting.curimage=(setting.persist)? simpleGallery.routines.getCookie("gallery-"+setting.wrapperid) : 0
	setting.curimage=setting.curimage || 0 //account for curimage being null if cookie is empty
	setting.ispaused=!setting.autoplay[0] //ispaused reflects current state of gallery, autoplay[0] indicates whether gallery is set to auto play
	setting.currentstep=0 //keep track of # of slides slideshow has gone through
	setting.totalsteps=setting.imagearray.length*setting.autoplay[2] //Total steps limit: # of images x # of user specified cycles
	setting.fglayer=0, setting.bglayer=1 //index of active and background layer (switches after each change of slide)
	setting.oninit=setting.oninit || function(){}
	setting.onslide=setting.onslide || function(){}
	var preloadimages=[], longestdesc=null //preload images
	setting.longestdesc="" //get longest description of all slides. If no desciptions defined, variable contains ""
	for (var i=0; i<setting.imagearray.length; i++){
		preloadimages[i]=new Image()
		preloadimages[i].src=setting.imagearray[i][0]
		if (setting.imagearray[i][3] && setting.imagearray[i][3].length>setting.longestdesc.length)
			setting.longestdesc=setting.imagearray[i][3]
	}
	var slideshow=this
	jQuery(document).ready(function($){
		var setting=slideshow.setting
		setting.$wrapperdiv=$('#'+setting.wrapperid).css({position:'relative', visibility:'visible', background:'black', overflow:'hidden', width:setting.dimensions[0], height:setting.dimensions[1]}).empty() //main gallery DIV
		if (setting.$wrapperdiv.length==0){ //if no wrapper DIV found
			alert("Error: DIV with ID \""+setting.wrapperid+"\" not found on page.")
			return
		}
		setting.$gallerylayers=$('<div class="gallerylayer"></div><div class="gallerylayer"></div>') //two stacked DIVs to display the actual slide 
			.css({position:'absolute', left:0, top:0})
			.appendTo(setting.$wrapperdiv)
		setting.gallerylayers=setting.$gallerylayers.get() //cache stacked DIVs as DOM objects		
		slideshow.showslide(setting.curimage) //show initial slide
		setting.oninit.call(slideshow) //trigger oninit() event
		$(window).bind('unload', function(){ //clean up and persist
			if (slideshow.setting.persist) //remember last shown image's index
				simpleGallery.routines.setCookie("gallery-"+setting.wrapperid, setting.curimage)
			jQuery.each(slideshow.setting, function(k){
				if (slideshow.setting[k] instanceof Array){
					for (var i=0; i<slideshow.setting[k].length; i++){
						if (slideshow.setting[k][i].tagName=="DIV") //catches 2 gallerylayer divs, gallerystatus div
							slideshow.setting[k][i].innerHTML=null
						slideshow.setting[k][i]=null
					}
				}
				if (slideshow.setting[k].innerHTML) //catch gallerydesctext div
					slideshow.setting[k].innerHTML=null
				slideshow.setting[k]=null
			})
			slideshow=slideshow.setting=null
		})
	})
}

simpleGallery.prototype={
	showslide:function(keyword){
		var slideshow=this
		var setting=slideshow.setting
		var totalimages=setting.imagearray.length
		var imgindex=(keyword=="next")? (setting.curimage<totalimages-1? setting.curimage+1 : 0)
			: (keyword=="prev")? (setting.curimage>0? setting.curimage-1 : totalimages-1)
			: Math.min(keyword, totalimages-1)
		setting.gallerylayers[setting.bglayer].innerHTML=simpleGallery.routines.getSlideHTML(setting.imagearray[imgindex])
		setting.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0}) //background layer becomes foreground
			.stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function(){ //Callback function after fade animation is complete:
				clearTimeout(setting.playtimer)
				setting.gallerylayers[setting.bglayer].innerHTML=null  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)
				try{
					setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage)
				}catch(e){
					alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: "+e)
				}
				setting.currentstep+=1
				if (setting.autoplay[0]){
					if (setting.currentstep<=setting.totalsteps)
						setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.autoplay[1])
					else
						slideshow.navigate("play/pause")
				}
			}) //end callback function
		setting.gallerylayers[setting.fglayer].style.zIndex=999 //foreground layer becomes background
		setting.fglayer=setting.bglayer
		setting.bglayer=(setting.bglayer==0)? 1 : 0
		setting.curimage=imgindex
		if (setting.imagearray[imgindex][3]){ //if this slide contains a description
			setting.$descpanel.css({visibility:'visible'})
			setting.descdiv.innerHTML=setting.imagearray[imgindex][3]
		}
		else if (setting.longestdesc!=""){ //if at least one slide contains a description (feature is enabled)
			setting.descdiv.innerHTML=null
			setting.$descpanel.css({visibility:'hidden'})

		}
	}	
}

simpleGallery.routines={

	getSlideHTML:function(imgelement){
		var layerHTML=(imgelement[1])? '<a href="'+imgelement[1]+'" target="'+imgelement[2]+'">\n' : '' //hyperlink slide?
		layerHTML+='<img src="'+imgelement[0]+'" style="border-width:0" />'
		layerHTML+=(imgelement[1])? '</a>' : ''
		return layerHTML //return HTML for this layer
	},
	
	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 + ";path=/"
	}
}