var fileLoadingImage = "/netc/picview/images/loading.gif";		
var fileBottomNavCloseImage = "/netc/picview/images/closelabel1.gif";

var resizeSpeed = 6;	// controls the speed of the image resizing (1=slowest and 10=fastest)

var borderSize = 10;	//if you adjust the padding in the CSS, you will need to update this variable
var showNumber = true; // addons show roll num

var imageArray = new Array;
var activeImage;

overlayDuration = 0;
resizeDuration = 0;

// -----------------------------------------------------------------------------------

//
//	Additional methods for Element added by SU, Couloir
//	- further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
	hide: function() {
		for (var i = 0; i < arguments.length; i++) {
			var element = $(arguments[i]);
			element.style.display = 'none';
		}
	},
	show: function() {
		for (var i = 0; i < arguments.length; i++) {
			var element = $(arguments[i]);
			element.style.display = '';
		}
	},
	getWidth: function(element) {
	   	element = $(element);
	   	return element.offsetWidth; 
	},
	setWidth: function(element,w) {
	   	element = $(element);
    	element.style.width = w +"px";
	},
	setHeight: function(element,h) {
   		element = $(element);
    	element.style.height = h +"px";
	},
	setTop: function(element,t) {
	   	element = $(element);
    	element.style.top = t +"px";
	},
	setSrc: function(element,src) {
    	element = $(element);
    	element.src = src; 
	},
	setHref: function(element,href) {
    	element = $(element);
    	element.href = href; 
	},
	setInnerHTML: function(element,content) {
		element = $(element);
		element.innerHTML = content;
	}
});

// -----------------------------------------------------------------------------------

//
//	Extending built-in Array object
//	- array.removeDuplicates()
//	- array.empty()
//
Array.prototype.removeDuplicates = function () {
	for(i = 1; i < this.length; i++){
		if(this[i][0] == this[i-1][0]){
			this.splice(i,1);
		}
	}
}

// -----------------------------------------------------------------------------------

Array.prototype.empty = function () {
	for(i = 0; i <= this.length; i++){
		this.shift();
	}
}


var Lightbox = Class.create();

Lightbox.prototype = {
	
	
	initialize: function() {	
		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		// loop through all anchor tags
		for (var i=0; i<anchors.length; i++){
			var anchor = anchors[i];
			
			var relAttribute = String(anchor.getAttribute('rel'));
			
			// use the string.match() method to catch 'lightbox' references in the rel attribute
			if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
				anchor.onclick = function () {myLightbox.start(this); return false;}
			}
		}

		


		var objBody = document.getElementsByTagName("body").item(0);
		
		var objOverlay = document.createElement("div");
		objOverlay.setAttribute('id','overlay');
		objOverlay.style.display = 'none';	
		objOverlay.onclick = function() { myLightbox.end(); return false; }
		objBody.appendChild(objOverlay);
		
		var objLightbox = document.createElement("div");
		objLightbox.setAttribute('id','lightbox');
		objLightbox.style.display = 'none';
		objBody.appendChild(objLightbox);
	    
		var objOuterImageContainer = document.createElement("div");
		objOuterImageContainer.setAttribute('id','outerImageContainer');
		objLightbox.appendChild(objOuterImageContainer);
		
		
		 var objPreNav=document.createElement("div");
	    objPreNav.setAttribute('id','prenav');
	    objOuterImageContainer.appendChild(objPreNav);	
	    
		var objHoverNav = document.createElement("div");
		objHoverNav.setAttribute('id','hoverNav');
	    objOuterImageContainer.appendChild(objHoverNav);
		

		var objImageContainer = document.createElement("div");
		objImageContainer.setAttribute('id','imageContainer');
		objOuterImageContainer.appendChild(objImageContainer);
		

		// close
		var objBottomNav = document.createElement("div");
		objBottomNav.setAttribute('id','bottomNav');
		objOuterImageContainer.appendChild(objBottomNav);
		
		var objLightboxImage = document.createElement("img");
		objLightboxImage.setAttribute('id','lightboxImage');

		objImageContainer.appendChild(objLightboxImage);
	
		
	
	   
	    
		var objPrevLink = document.createElement("a");
		objPrevLink.setAttribute('id','prevLink');
		objPrevLink.setAttribute('href','#');
		objPrevLink.onfocus = function() { this.blur();}
		objPreNav.appendChild(objPrevLink);
		
		var objPreimg=document.createElement("img");
		objPreimg.setAttribute('src','/netc/picview/images/prev_blue.gif');
		objPrevLink.appendChild(objPreimg);
		
		
		var objNextLink = document.createElement("a");
		objNextLink.setAttribute('id','nextLink');
		objNextLink.setAttribute('href','#');
		objNextLink.onfocus = function() { this.blur();}
		objHoverNav.appendChild(objNextLink);
		
		
		var objNextimg=document.createElement("img");
		objNextimg.setAttribute('src','/netc/picview/images/next_blue.gif');
		objNextLink.appendChild(objNextimg);	
		
	
		var objLoading = document.createElement("div");
		objLoading.setAttribute('id','loading');
		objImageContainer.appendChild(objLoading);
	
		var objLoadingLink = document.createElement("a");
		objLoadingLink.setAttribute('id','loadingLink');
		objLoadingLink.setAttribute('href','#');
		objLoadingLink.onclick = function() { myLightbox.end(); return false; }
		objLoading.appendChild(objLoadingLink);
	
		var objLoadingImage = document.createElement("img");
		objLoadingImage.setAttribute('src', fileLoadingImage);
		objLoadingLink.appendChild(objLoadingImage);

		var objImageDataContainer = document.createElement("div");
		objImageDataContainer.setAttribute('id','imageDataContainer');
		objImageDataContainer.className = 'clearfix';
		objLightbox.appendChild(objImageDataContainer);

		var objImageData = document.createElement("div");
		objImageData.setAttribute('id','imageData');
		objImageDataContainer.appendChild(objImageData);
	
		var objCaption = document.createElement("div");
		objCaption.setAttribute('id','caption');
		objImageData.appendChild(objCaption);
		
		var objImageDetails = document.createElement("div");
		objImageDetails.setAttribute('id','imageDetails');
		objImageData.appendChild(objImageDetails);
	
		var objNumberDisplay = document.createElement("span");
		objNumberDisplay.setAttribute('id','numberDisplay');
		objImageDetails.appendChild(objNumberDisplay);
	
		var objBottomNavCloseLink = document.createElement("a");
		objBottomNavCloseLink.setAttribute('id','bottomNavClose');
		objBottomNavCloseLink.setAttribute('href','#');
		objBottomNavCloseLink.onfocus = function() { this.blur();}
		objBottomNavCloseLink.onclick = function() { myLightbox.end(); return false; }
		objBottomNav.appendChild(objBottomNavCloseLink);
	
		var objBottomNavCloseImage = document.createElement("img");
		objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
        objBottomNavCloseImage.setAttribute('width',20);
        objBottomNavCloseImage.setAttribute('height',20);
		objBottomNavCloseLink.appendChild(objBottomNavCloseImage);
		
		overlayEffect = new fx.Opacity(objOverlay, { duration: 300 });	
		overlayEffect.hide();
		},
	
	
	
	//
	//	start()
	//	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
	//
	start: function(imageLink) {	

		hideSelectBoxes();

	
		
		
		var arrayPageSize = getPageSize();
		
		Element.setHeight('overlay', arrayPageSize[1]);
		overlayEffect.custom(0,0.1);
		document.getElementById('overlay').style.display = '';
		
		imageArray = [];
		imageNum = 0;		

		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');
		

		if((imageLink.getAttribute('rel') == 'lightbox')){
			// add single image to imageArray
			
			imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));			
		} else {
		// if image is part of a set..

			// loop through anchors, find other images in set, and add them to imageArray
			for (var i=0; i<anchors.length; i++){
				var anchor = anchors[i];
				if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel'))){
					var ancortitle=" ";
					if(anchor.getAttribute('title')!="")
					{
					    ancortitle=anchor.getAttribute('title');
					}
					imageArray.push(new Array(anchor.getAttribute('href'),ancortitle));
				}
			}
			imageArray.removeDuplicates();
			while(imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++;}
		}

		// calculate top offset for the lightbox and display 
		var arrayPageSize = getPageSize();
		var arrayPageScroll = getPageScroll();
		var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 15);
       Element.setTop('lightbox', lightboxTop );//設置彈出DIV與頂端的距離
        if (showNumber && (! $('ImagesRollNum')) )	{
		    var box = $('imageDetails');
 			var RollNumBox = document.createElement("div");
			RollNumBox.setAttribute('id','RollNumBox');
			var objImageRollNum = document.createElement("div");
			objImageRollNum.setAttribute('id','ImagesRollNum');
			objImageRollNum.setAttribute('class','ImagesRollNum');
			RollNumBox.appendChild(objImageRollNum);
			box.appendChild(RollNumBox);
			var str="";
			if(imageArray.length>1)
			{
			var len = imageArray.length;			
			var str = '<a href="javascript:;" id="PrevImg" name="PrevImg" onfocus="this.blur()">上一頁</a><span>';
			for (var i=1; i<=len; i++) {
				str += '<a href="javascript:;" id="RollNum' + i + '" onclick="myLightbox.changeImage('+(i-1)+')" onfocus="this.blur()">' + i + '</a></li>';
			}
			str += '</span><a href="javascript:;" id="NextImg" name="NextImg" onfocus="this.blur()">下一頁</a>';
			}
			objImageRollNum.innerHTML = str;	
		
		}
		
	  
		Element.show('lightbox');
		Element.hide('imageDataContainer');
		
		this.changeImage(imageNum);
		

	},

	


changeImage: function(imageNum) {
		activeImage = imageNum;	// update global var

		// hide elements during transition
		Element.show('loading');
	
		var total = imageArray.length;
		
        if (total > 1) {
			if (0 == imageNum) {
				Element.hide('prevLink');
			} else if (imageNum == total -1) {
				Element.hide('nextLink');
			} else {
				Element.show('prevLink');
				Element.show('nextLink');
			}
		} else {
			Element.hide('prevLink');
			Element.hide('nextLink');
			
		}
		Element.hide('numberDisplay');
		imgPreloader = new Image();

		// once image is preloaded, resize image container
		   imgPreloader.onload=function(){
			Element.setSrc('lightboxImage', imageArray[activeImage][0]);
			var i = document.getElementById('lightboxImage');
			
			var imgwidth=imgPreloader.width;
		
		   var imgheight=imgPreloader.height;
		 
			var imgw=imgPreloader.width/500,imgh=imgPreloader.height/400;
//			var imgcon=document.getElementById('imageContainer');

			if(imgw>imgh)
			{
			
			 
			    if(imgw>1)
			    {
			   
			       imgwidth=500;
			       imgheight=imgPreloader.height/imgw;
			       if(imgheight<350)			       
			            i.style.marginTop = parseInt((400-imgheight)/2-30) + "px";//修改 圖片與頂端的距離
			       else
			            i.style.marginTop = parseInt((imgheight-400)/2) + "px";//修改 圖片與頂端的距離    
                        
			     
			    }
			    else
			    {  
                     

			        i.style.marginTop = parseInt((410 - imgPreloader.height) / 2-10) + "px";
                    

			    }
			}
			else
			{
			   
			    if(imgh>1)
			    {
			        imgheight=400;
			        imgwidth=imgPreloader.width/imgh;
			        i.style.marginTop = 0;
			    

			    }
			    else
			    {

				    i.style.marginTop = parseInt((410 - imgPreloader.height) / 2-10) + "px";
				    
			    }
			}		
			

			
			Element.setWidth('lightboxImage',imgwidth);
			Element.setHeight('lightboxImage',imgheight);

			myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);			
		}
		imgPreloader.src = imageArray[activeImage][0];
		if ('' == imageArray[0][1]) {
			hide('caption');
			document.getElementById('caption').innerHTML = '';
			
		} else if (1 == imageArray.length) {
			document.getElementById('caption').style.display = "block";
			document.getElementById('caption').innerHTML = imageArray[0][1];
			document.getElementById("ImagesRollNum").innerHTML=imageArray[0][1];
		}
		
	},

	//
	//	resizeImageContainer()
	//
	resizeImageContainer: function( imgWidth, imgHeight) {
        
        imgWidth=500;
        imgHeight=410;
        
		// get current height and width
		this.wCur = Element.getWidth('outerImageContainer');
		this.hCur = Element.getHeight('outerImageContainer');

        
		// scalars based on change from old to new
		this.xScale = ((imgWidth  + (borderSize * 14)) / this.wCur) * 100;
		this.yScale = ((imgHeight  + (borderSize * 2)) / this.hCur) * 100;
		
       // alert(this.xScale+"vs"+this.yScale);
		// calculate size difference between new and old image, and resize if necessary
		wDiff = (this.wCur - borderSize * 2) - imgWidth;
		hDiff = (this.hCur - borderSize * 2) - imgHeight;
       // alert(wDiff+"sss"+hDiff);
		if(!( hDiff == 0)){ new Effect.Scale('outerImageContainer', this.yScale, {scaleX: false, duration: resizeDuration, queue: 'front'}); }
		if(!( wDiff == 0)){ new Effect.Scale('outerImageContainer', this.xScale, {scaleY: false, delay: resizeDuration, duration: resizeDuration}); }
		
		

		// if new and old image are same size and no scaling transition is necessary, 
		// do a quick pause to prevent image flicker.
		if((hDiff == 0) && (wDiff == 0)){
			if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } else { pause(100);} 
		}
       
		Element.setHeight('prevLink', '20');
		Element.setHeight('nextLink', '20');
		Element.setWidth( 'imageDataContainer', imgWidth + (borderSize * 14));
	
		

		this.showImage();
		
		
	},
	
	//
	//	showImage()
	//	Display image and begin preloading neighbors.
	//
	showImage: function(){
		Element.hide('loading');
		new Effect.Appear('lightboxImage', { duration: 0.5, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
		this.preloadNeighborImages();
	},

	
	updateDetails: function() {
	
		Element.show('caption');
		Element.setInnerHTML( 'caption', imageArray[activeImage][1]);
		//
		// if image is part of set display 'Image x of x' 
//		if(imageArray.length > 1){
			Element.show('numberDisplay');
//			Element.setInnerHTML( 'numberDisplay', "Image " + eval(activeImage + 1) + " of " + imageArray.length);
//		}

		new Effect.Parallel(
			[ 
			  new Effect.Appear('imageDataContainer', { sync: true, duration: 1.0 }) ] 
			
		);

	myLightbox.updateNav();
	
	},

	

updateNav: function() {
		var last = null;
		// if not first image in set, display prev image button
		if(activeImage != 0){
			Element.show('prevLink');
			document.getElementById('prevLink').onclick = function() {
				myLightbox.changeImage(activeImage - 1); return false;
			}
			// addons
			if (showNumber)	{
				var eles = document.getElementsByName('PrevImg');
				var obj = eles[0];
				obj.style.display = '';
				obj.onclick = function() {
					myLightbox.changeImage(activeImage - 1); return false;
				}
			}
			this.setCurrentNum();
		} else {
			if (showNumber && imageArray.length > 1) {
				document.getElementsByName('PrevImg')[0].style.display = 'none';
			}
		}

		// if not last image in set, display next image button
		if(activeImage != (imageArray.length - 1)){
			last = activeImage + 1;
			Element.show('nextLink');
			document.getElementById('nextLink').onclick = function() {
				myLightbox.changeImage(activeImage + 1); return false;
			}
			// addons
			if (showNumber)	{
				var eles = document.getElementsByName('NextImg');
				var obj = eles[0];
				obj.style.display = '';
				obj.onclick = function() {
					myLightbox.changeImage(last); return false;
				}
			}
			this.setCurrentNum();
		} else {
			if (showNumber && imageArray.length > 1) {
				document.getElementsByName('NextImg')[0].style.display = 'none';
			}
		}
		this.enableKeyboardNav();
		
	},
  setCurrentNum: function() {
		if (showNumber && imageArray.length > 1) {
			var currentImg = activeImage + 1;
			var obj = document.getElementById("RollNum" + currentImg);
			if (obj) {
			  var len = imageArray.length;
				for (var i=1; i<=len; i++) {
            		document.getElementById("RollNum"+i).className = "";
				}
				if ('' == imageArray[currentImg-1][1]) {
					hide('caption');
				} else {
					document.getElementById('caption').style.display = "block";
					document.getElementById('caption').innerHTML = imageArray[currentImg-1][1];
				}
				document.getElementById("RollNum"+currentImg).className = "Select";
			}
		}
	},
	//
	//	enableKeyboardNav()
	//


	//
	enableKeyboardNav: function() {
		document.onkeydown = this.keyboardAction; 
	},

	//
	//	disableKeyboardNav()
	//
	disableKeyboardNav: function() {
		document.onkeydown = '';
	},

	//
	//	keyboardAction()
	//
	keyboardAction: function(e) {
		if (e == null) { // ie
			keycode = event.keyCode;
		} else { // mozilla
			keycode = e.which;
		}

		key = String.fromCharCode(keycode).toLowerCase();
		
		if((key == 'x') || (key == 'o') || (key == 'c')){	// close lightbox
			myLightbox.end();
		} else if(key == 'p'){	// display previous image
			if(activeImage != 0){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage - 1);
			}
		} else if(key == 'n'){	// display next image
			if(activeImage != (imageArray.length - 1)){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage + 1);
			}
		}


	},

	//
	//	preloadNeighborImages()
	//	Preload previous and next images.
	//
	preloadNeighborImages: function(){

		if((imageArray.length - 1) > activeImage){
			preloadNextImage = new Image();
			preloadNextImage.src = imageArray[activeImage + 1][0];
		}
		if(activeImage > 0){
			preloadPrevImage = new Image();
			preloadPrevImage.src = imageArray[activeImage - 1][0];
		}
	
	},

	//
	//	end()
	//
	end: function() {
		this.disableKeyboardNav();
		Element.hide('lightbox');
		new Effect.Fade('overlay', { duration: 0.2});
		showSelectBoxes();
		

	}
}

// -----------------------------------------------------------------------------------


function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}

function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}


function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){
	}
}

function listenKey () {	document.onkeypress = getKey; }
	
// ---------------------------------------------------

function showSelectBoxes(){
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
}

// ---------------------------------------------------

function hideSelectBoxes(){
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "hidden";
	}
}


function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

// ---------------------------------------------------



function initLightbox() { myLightbox = new Lightbox(); }
Event.observe(window, 'load', initLightbox, false);