/* Ultimate Fade-in slideshow (v2.1)
* Last updated: Sept 10th, 2009. This notice must stay intact for usage 
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code
*/

jQuery.noConflict()

function fadeSlideShow(settingarg){
	this.setting=settingarg
	settingarg=null
	var setting=this.setting
	setting.fadeduration=setting.fadeduration? parseInt(setting.fadeduration) : 500
	setting.curimage=(setting.persist)? fadeSlideShow.routines.getCookie("gallery-"+setting.wrapperid) : 0
	setting.curimage=setting.curimage || 0 //account for curimage being null if cookie is empty
	setting.currentstep=0 //keep track of # of slides slideshow has gone through (applicable in displaymode='auto' only)
	setting.totalsteps=setting.imagearray.length*(setting.displaymode.cycles>0? setting.displaymode.cycles : Infinity) //Total steps limit (applicable in displaymode='auto' only w/ cycles>0)
	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(){}
	if (setting.displaymode.randomize) //randomly shuffle order of images?
		setting.imagearray.sort(function() {return 0.5 - Math.random()})
	var preloadimages=[] //preload images
	for (var i=0; i<setting.imagearray.length; i++){ //preload images
		preloadimages[i]=new Image()
		preloadimages[i].src=setting.imagearray[i][0]
	}
	var slideshow=this
	jQuery(document).ready(function($){ //fire on DOM ready
		var setting=slideshow.setting
		var fullhtml=fadeSlideShow.routines.getFullHTML(setting.imagearray) //get full HTML of entire slideshow
		setting.$wrapperdiv=$('#'+setting.wrapperid)
			.css({position:'relative', visibility:'visible', background:'transparent', overflow:'hidden', 
			width:setting.dimensions[0], height:setting.dimensions[1]}).empty() //main slideshow DIV
		if (setting.$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, width:'100%', height:'100%', background:'transparent'})
			.appendTo(setting.$wrapperdiv)

		//prefill both layers with entire slideshow content, hide all images, and return current image
		var $curimage=setting.$gallerylayers.html(fullhtml).find('img').hide().eq(setting.curimage)

		// these 2 lines pause the slideshow onMouseOver:
		//setting.$wrapperdiv.bind('mouseenter', function(){setting.pause=true})
		//setting.$wrapperdiv.bind('mouseleave', function(){setting.pause=false})

		if ($curimage.get(0).complete){ //accounf for IE not firing image.onload
			slideshow.paginateinit($)
			slideshow.showslide(setting.curimage)
		}
		else { //initialize slideshow when first image has fully loaded
			slideshow.paginateinit($)
			$curimage.bind('load', function(){slideshow.showslide(setting.curimage)})
		}
		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
				fadeSlideShow.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
					}
				}
			})
			slideshow=slideshow.setting=null
		})
	})
}

fadeSlideShow.prototype={
	navigate:function(keyword){
		var setting=this.setting
		clearTimeout(setting.playtimer)
		//if (setting.displaymode.type=="auto"){ //in auto mode
		//	setting.displaymode.type="manual" //switch to "manual" mode when nav buttons are clicked on
		//	setting.displaymode.wraparound=true //set wraparound option to true
		//}
		if (!isNaN(parseInt(keyword))){ //go to specific slide?
			this.showslide(parseInt(keyword))
		}
		else if (/(prev)|(next)/i.test(keyword)){ //go back or forth inside slide?
			this.showslide(keyword.toLowerCase())
		}
	},

	showslide:function(keyword){
		var slideshow=this
		var setting=slideshow.setting
		if (setting.displaymode.type=="auto" && setting.pause && setting.currentstep<=setting.totalsteps){ 
			//if slideshow in autoplay mode and setting.pause==true, pause it
			setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.displaymode.pause)
			return
		}
		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)
		var $slideimage=setting.$gallerylayers.eq(setting.bglayer).find('img').hide().eq(imgindex).show() //hide all images except current one
		var imgdimensions=[$slideimage.width(), $slideimage.height()] //center align image
		$slideimage.css({marginLeft: (imgdimensions[0]>0 && imgdimensions[0]<setting.dimensions[0])? setting.dimensions[0]/2-imgdimensions[0]/2 : 0})
		$slideimage.css({marginTop: (imgdimensions[1]>0 && imgdimensions[1]<setting.dimensions[1])? setting.dimensions[1]/2-imgdimensions[1]/2 : 0})

		// background layer becomes foreground
		setting.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0})
			.stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function() { //Callback function after fade animation is complete:
				clearTimeout(setting.playtimer)
				try {
					setting.onslide.call(slideshow, setting.$gallerylayers.eq(setting.fglayer).get(0), setting.curimage)
				} catch(e) {
					alert("Fade In Slideshow error: An error has occured somwhere in your code attached to the \"onslide\" event: "+e)
				}
				setting.currentstep+=1
				if (setting.displaymode.type=="auto") {
					if (setting.currentstep<=setting.totalsteps || setting.displaymode.cycles==0)
						setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.displaymode.pause)
				}
			}); //end callback function

		// foreground layer fades into background
		setting.$gallerylayers.eq(setting.fglayer).css({zIndex:999, opacity:1})
			.stop().css({opacity:1}).animate({opacity:0}, setting.fadeduration, function() {});

		// now switch the foreground and background layers
		setting.fglayer=setting.bglayer;
		setting.bglayer=(setting.bglayer==0)? 1 : 0;
		setting.curimage=imgindex;
		if (setting.displaymode.type=="manual" && !setting.displaymode.wraparound) {
			this.paginatecontrol();
		}
		if (setting.$status) //if status container defined
			setting.$status.html("Photo " + (setting.curimage+1) + " of " + totalimages);
	},

	paginateinit:function($){
		var slideshow=this
		var setting=this.setting
		if (setting.togglerid){ //if toggler div defined
			setting.$togglerdiv=$("#"+setting.togglerid)
			setting.$prev=setting.$togglerdiv.find('.prev').data('action', 'prev')
			setting.$next=setting.$togglerdiv.find('.next').data('action', 'next')
			setting.$prev.add(setting.$next).click(function(e){ //assign click behavior to prev and next controls
				var $target=$(this)
				slideshow.navigate($target.data('action'))
				e.preventDefault()
			})
			setting.$status=setting.$togglerdiv.find('.status')
		}
	},

	paginatecontrol:function(){
		var setting=this.setting
			setting.$prev.css({opacity:(setting.curimage==0)? 0.4 : 1}).data('action', (setting.curimage==0)? 'none' : 'prev')
			setting.$next.css({opacity:(setting.curimage==setting.imagearray.length-1)? 0.4 : 1}).data('action', (setting.curimage==setting.imagearray.length-1)? 'none' : 'next')
			if (document.documentMode==8){ //in IE8 standards mode, apply opacity to inner image of link
				setting.$prev.find('img:eq(0)').css({opacity:(setting.curimage==0)? 0.4 : 1})
				setting.$next.find('img:eq(0)').css({opacity:(setting.curimage==setting.imagearray.length-1)? 0.4 : 1})
			}
	}	
}

fadeSlideShow.routines={
	getSlideHTML:function(imgelement){
		var layerHTML = (imgelement[1])? '<a href="'+imgelement[1]+'" target="'+imgelement[2]+'">\n' : '' //hyperlink slide?
		var img = new Image();
		img.src = imgelement[0];
		if (img.width > 600) {
			layerHTML += '<img src="' + imgelement[0] + '" class="centeredImage" width="100%" />\n'
		} else if (img.height > 360) {
			layerHTML += '<img src="' + imgelement[0] + '" class="centeredImage" height="100%" />\n'
		} else {
			layerHTML += '<img src="' + imgelement[0] + '" class="centeredImage" /></center>\n'
		}
		layerHTML += (imgelement[1])? '</a>\n' : ''
		return layerHTML //return HTML for this layer
	},

	getFullHTML:function(imagearray){
		var preloadhtml=''
		for (var i=0; i<imagearray.length; i++)
			preloadhtml+=this.getSlideHTML(imagearray[i])
		return preloadhtml
	},

	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=/"
	}
}