// Lightbox
//
//	Configuration
//
var fileLoadingImage = "/images/lightbox/loading.gif";		
var fileBottomNavCloseImage = "/images/lightbox/closelabel.gif";
var fileTopNavCloseImage = "/images/lightbox/closelabel.gif";

var resizeSpeed = 10;	// 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

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

//
//	Global Variables
//
var imageArray = new Array;
var activeImage;

if(resizeSpeed > 10){ resizeSpeed = 10;}
if(resizeSpeed < 1){ resizeSpeed = 1;}
resizeDuration = (11 - resizeSpeed) * 0.15;

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

//
//	Additional methods for Element added by SU, Couloir
//	- further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
	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 = 0; i < this.length; i++){
		for (var i_tem = 0; i_tem < this.length; i_tem++)
		if(this[i][0] == this[i_tem][0]&&i!==i_tem){
			this.splice(i_tem,1);
		}
	}
}

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

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

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

//
//	Lightbox Class Declaration
//	- initialize()
//	- start()
//	- changeImage()
//	- resizeImageContainer()
//	- showImage()
//	- updateDetails()
//	- updateNav()
//	- enableKeyboardNav()
//	- disableKeyboardNav()
//	- keyboardNavAction()
//	- preloadNeighborImages()
//	- end()
//
//	Structuring of code inspired by Scott Upton (http://www.uptonic.com/)
//
var Lightbox = Class.create();

Lightbox.prototype = {
	
	// initialize()
	// Constructor runs on completion of the DOM loading. Loops through anchor tags looking for 
	// 'lightbox' references and applies onclick events to appropriate links. The 2nd section of
	// the function inserts html at the bottom of the page which is used to display the shadow 
	// overlay and the image container.
	//
	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;}
			}
		}

		// The rest of this code inserts html at the bottom of the page that looks similar to this:
		//
		//	<div id="overlay"></div>
		//	<div id="lightbox">
		//		<div id="imageDataContainerTop">
		//			<div id="imageDataTop">
		//				<div id="imageDetailsTop">
		//					<span id="fliptop">
		//						<a href="#" id="flipCardOverTop"></a>
		//					</span>
		//				</div>
		//				<div id="topNav">
		//					<a href="#" id="topNavClose">
		//						<img src="images/closesmall.gif">
		//					</a>
		//				</div>
		//			</div>
		//		</div>
		//		<div id="outerImageContainer">
		//			<div id="imageContainer">
		//				<img id="lightboxImage">
		//				</div>
		//				<div id="loading">
		//					<a href="#" id="loadingLink">
		//						<img src="images/loading.gif">
		//					</a>
		//				</div>
		//			</div>
		//		</div>
		//		<div id="imageDataContainerBottom">
		//			<div id="imageDataBottom">
		//				<div id="imageDetailsBottom">
		//					<span id="flipBottom">
		//						<a href="#" id="flipCardOverBottom"></a>
		//					</span>
		//				</div>
		//				<div id="bottomNav">
		//					<a href="#" id="bottomNavClose">
		//						<img src="images/close.gif">
		//					</a>
		//				</div>
		//			</div>
		//		</div>
		//	</div>


		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 objImageDataTopContainerTop = document.createElement("div");
			objImageDataTopContainerTop.setAttribute('id','imageDataContainerTop');
			objImageDataTopContainerTop.className = 'clearfix';
			objLightbox.appendChild(objImageDataTopContainerTop);
			
				var objImageDataTop = document.createElement("div");
				objImageDataTop.setAttribute('id','imageDataTop');
				objImageDataTopContainerTop.appendChild(objImageDataTop);
	
					var objImageDetailsTop = document.createElement("div");
					objImageDetailsTop.setAttribute('id','imageDetailsTop');
					objImageDataTop.appendChild(objImageDetailsTop);
		
						var objFlipCardTop = document.createElement("span");
						objFlipCardTop.setAttribute('id','flipTop');
						var objFlipCardTopLink = document.createElement("a");
						objFlipCardTopLink.setAttribute('id','flipCardLinkTop');
						objFlipCardTopLink.setAttribute('href','#');
						objFlipCardTop.appendChild(objFlipCardTopLink);	
						objImageDetailsTop.appendChild(objFlipCardTop);
					
						var objDescription = document.createElement("span");
						objDescription.setAttribute('id','desc');
						objFlipCardTop.appendChild(objDescription);
		
				var objTopNav = document.createElement("div");
				objTopNav.setAttribute('id','topNav');
				objImageDataTop.appendChild(objTopNav);
					
					var objTopNavCloseLink = document.createElement("a");
					objTopNavCloseLink.setAttribute('id','TopNavClose');
					objTopNavCloseLink.setAttribute('href','#');
					objTopNavCloseLink.onclick = function() { myLightbox.end(); return false; }
					objTopNav.appendChild(objTopNavCloseLink);
				
					var objTopNavCloseImage = document.createElement("img");
					objTopNavCloseImage.setAttribute('src', fileTopNavCloseImage);
					objTopNavCloseLink.appendChild(objTopNavCloseImage);
	
			var objOuterImageContainer = document.createElement("div");
			objOuterImageContainer.setAttribute('id','outerImageContainer');
			objLightbox.appendChild(objOuterImageContainer);

				var objImageContainer = document.createElement("div");
				objImageContainer.setAttribute('id','imageContainer');
				objOuterImageContainer.appendChild(objImageContainer);
				
					var objLightboxCloseLink = document.createElement("a");
					objLightboxCloseLink.setAttribute('id','lightboxImageCloseLink');
					objLightboxCloseLink.setAttribute('href','#');
					objLightboxCloseLink.onclick = function() { myLightbox.end(); return false; }
					objImageContainer.appendChild(objLightboxCloseLink);	
										
					var objLightboxImage = document.createElement("img");
					objLightboxImage.setAttribute('id','lightboxImage');
					objLightboxCloseLink.appendChild(objLightboxImage);					

					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 objImageDataContainerBottom = document.createElement("div");
			objImageDataContainerBottom.setAttribute('id','imageDataContainerBottom');
			objImageDataContainerBottom.className = 'clearfix';
			objLightbox.appendChild(objImageDataContainerBottom);

				var objImageDataBottom = document.createElement("div");
				objImageDataBottom.setAttribute('id','imageDataBottom');
				objImageDataContainerBottom.appendChild(objImageDataBottom);
			
					var objImageDetailsBottom = document.createElement("div");
					objImageDetailsBottom.setAttribute('id','imageDetailsBottom');
					objImageDataBottom.appendChild(objImageDetailsBottom);
						
						var objFlipCardBottom = document.createElement("span");
						objFlipCardBottom.setAttribute('id','flipBottom');
						var objFlipCardBottomLink = document.createElement("a");
						objFlipCardBottomLink.setAttribute('id','flipCardLinkBottom');
						objFlipCardBottomLink.setAttribute('href','#');
						objFlipCardBottom.appendChild(objFlipCardBottomLink);	
						objImageDetailsBottom.appendChild(objFlipCardBottom);
				
				var objBottomNav = document.createElement("div");
				objBottomNav.setAttribute('id','bottomNav');
				objImageDataBottom.appendChild(objBottomNav);
			
					var objBottomNavCloseLink = document.createElement("a");
					objBottomNavCloseLink.setAttribute('id','bottomNavClose');
					objBottomNavCloseLink.setAttribute('href','#');
					objBottomNavCloseLink.onclick = function() { myLightbox.end(); return false; }
					objBottomNav.appendChild(objBottomNavCloseLink);
			
					var objBottomNavCloseImage = document.createElement("img");
					objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
					objBottomNavCloseLink.appendChild(objBottomNavCloseImage);
	},
	//
	// updateImageList()
	// Loops through anchor tags looking for 'lightbox' references and applies onclick
	// events to appropriate links. You can rerun after dynamically adding images w/ajax.
	//
	updateImageList: function() {	
		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');
		var areas = document.getElementsByTagName('area');

		// 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;}
			}
		}

		// loop through all area tags
		// todo: combine anchor & area tag loops
		for (var i=0; i< areas.length; i++){
			var area = areas[i];
			
			var relAttribute = String(area.getAttribute('rel'));
			
			// use the string.match() method to catch 'lightbox' references in the rel attribute
			if (area.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
				area.onclick = function () {myLightbox.start(this); return false;}
			}
		}
	},
	//
	//	start()
	//	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
	//
	start: function(imageLink) {	

		hideSelectBoxes();

		// stretch overlay to fill page and fade in
		var arrayPageSize = getPageSize();
		Element.setHeight('overlay', arrayPageSize[1]);
		new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: 0.8 });

		imageArray = [];
		imageNum = 0;		

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

		// if image is NOT part of a set..
		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'))){
					imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
				}
			}
			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.show('imageDataContainerTop');
		Element.show('imageDataContainerBottom');
		Element.setTop('lightbox', lightboxTop);
		Element.show('lightbox');

		
		this.changeImage(imageNum);
	},

	//
	//	changeImage()
	//	Hide most elements and preload image in preparation for resizing image container.
	//
	changeImage: function(imageNum) {	
		
		activeImage = imageNum;	// update global var

		// hide elements during transition
		Element.hide('imageDataContainerTop');
		Element.hide('imageDataContainerBottom');
		Element.show('loading');
		Element.hide('lightboxImage');

			
		imgPreloader = new Image();
		
		// once image is preloaded, resize image container
		imgPreloader.onload=function(){
			Element.setSrc('lightboxImage', imageArray[activeImage][0]);
			myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
		}
		imgPreloader.src = imageArray[activeImage][0];
	},

	//
	//	resizeImageContainer()
	//
	resizeImageContainer: function( imgWidth, imgHeight) {

		// 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 * 2)) / this.wCur) * 100;
		this.yScale = ((imgHeight  + (borderSize * 2)) / this.hCur) * 100;

		// calculate size difference between new and old image, and resize if necessary
		wDiff = (this.wCur - borderSize * 2) - imgWidth;
		hDiff = (this.hCur - borderSize * 2) - imgHeight;

		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.setWidth( 'imageDataContainerTop', imgWidth + (borderSize * 2));
		Element.setWidth( 'imageDataContainerBottom', imgWidth + (borderSize * 2));

		this.showImage();
	},
	
	//
	//	showImage()
	//	Display image and begin preloading neighbors.
	//
	showImage: function(){
		Element.hide('loading');
		new Effect.Appear('lightboxImage', { duration: 0.3, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
		this.preloadNeighborImages();
	},

	//
	//	updateDetails()
	//	Display image number, and bottom nav.
	//
	updateDetails: function() {
	 myLightbox.updateNav();
		new Effect.Parallel(
			[ new Effect.BlindDown('imageDataContainerTop', { sync: true, duration: 0.5, fps:40}), new Effect.BlindDown('imageDataContainerBottom', { sync: true, duration: 0.5, fps:40}) ], 
			{ duration: 0.5 } 
		);
	},

	//
	//	updateNav()
	//	Display appropriate previous and next hover navigation.
	//
	updateNav: function() {
		if(imageArray.length == 2){
				if(imageArray[activeImage][0].toLowerCase().indexOf('f.jpg') > -1) {
					Element.setInnerHTML( 'flipCardLinkTop', "Show back of card");
					Element.setInnerHTML( 'flipCardLinkBottom', "Show back of card");
					Element.setInnerHTML( 'desc', ", or press ESC to close.");
				} else {			
					Element.setInnerHTML( 'flipCardLinkTop', "Show front of card");
					Element.setInnerHTML( 'flipCardLinkBottom', "Show front of card");
					Element.setInnerHTML( 'desc', ", or press ESC to close.");
				}	
			if(activeImage == 0){
				document.getElementById('flipCardLinkTop').onclick = function(){
					myLightbox.changeImage(1); return false;
				} 
				document.getElementById('flipCardLinkBottom').onclick = function(){
					myLightbox.changeImage(1); return false;
				} 
			} else {
				document.getElementById('flipCardLinkTop').onclick = function() {
					myLightbox.changeImage(0); return false;
				} 
				document.getElementById('flipCardLinkBottom').onclick = function() {
					myLightbox.changeImage(0); return false;
				} 				
			}
		}
		
		this.enableKeyboardNav();
	},

	//
	//	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') || (keycode == 27)){	// close lightbox
			myLightbox.end();
		} 
		


	},

	//
	//	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();
	}
}

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

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
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;
}

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

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
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;
}

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

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//
function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){
	}
}

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

//
// listenKey()
//
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";
	}
}

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

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
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);