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

//

//	Litebox v1.0

//	A combined effort between detrate and gannon

//	07/03/06

//

//	Source edited from Lightbox v2.02

//	by Lokesh Dhakar - http://www.huddletogether.com

//

//	For more information on this script, visit:

//	http://doknowevil.net/litebox

//

//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/

//	

//	Credit also due to those who have helped, inspired, and made their code available to the public.

//	Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.org), Thomas Fuchs(mir.aculo.us), and others.

//

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



//

//	Configuration

//

var fileLoadingImage = "gfx/loading.gif";		

var fileBottomNavCloseImage = "gfx/closelabel.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



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



//

//	Global Variables

//

var imageArray = new Array;

var activeImage;



if(resizeSpeed > 10){ resizeSpeed = 10;}

if(resizeSpeed < 1){ resizeSpeed = 1;}

resizeDuration = (11 - resizeSpeed) * 100;



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



//

//	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";

	},

	getHeight: function(element) {

		element = $(element);

		return element.offsetHeight;

	},

	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; 

	},

	setInnerHTML: function(element,content) {

		element = $(element);

		element.innerHTML = content;

	}

});



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



//

//	Extending built-in Array object

//

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();

	}

}



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

//

//	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;}

			}

		}



		var objBody = document.getElementsByTagName("body").item(0);

		

		var objOverlay = document.createElement("div");

		objOverlay.setAttribute('id','overlay');

		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 objImageContainer = document.createElement("div");

		objImageContainer.setAttribute('id','imageContainer');

		objOuterImageContainer.appendChild(objImageContainer);

	

		var objLightboxImage = document.createElement("img");

		objLightboxImage.setAttribute('id','lightboxImage');

		objImageContainer.appendChild(objLightboxImage);

	

		var objHoverNav = document.createElement("div");

		objHoverNav.setAttribute('id','hoverNav');

		objImageContainer.appendChild(objHoverNav);

	

		var objPrevLink = document.createElement("a");

		objPrevLink.setAttribute('id','prevLink');

		objPrevLink.setAttribute('href','#');

		objHoverNav.appendChild(objPrevLink);

		

		var objNextLink = document.createElement("a");

		objNextLink.setAttribute('id','nextLink');

		objNextLink.setAttribute('href','#');

		objHoverNav.appendChild(objNextLink);

	

		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 objImageDetails = document.createElement("div");

		objImageDetails.setAttribute('id','imageDetails');

		objImageData.appendChild(objImageDetails);

	

		var objCaption = document.createElement("span");

		objCaption.setAttribute('id','caption');

		objImageDetails.appendChild(objCaption);

	

		var objNumberDisplay = document.createElement("span");

		objNumberDisplay.setAttribute('id','numberDisplay');

		objImageDetails.appendChild(objNumberDisplay);

		

		var objBottomNav = document.createElement("div");

		objBottomNav.setAttribute('id','bottomNav');

		objImageData.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);

		

		overlayEffect = new fx.Opacity(objOverlay, { duration: 300 });	

		overlayEffect.hide();

		

		imageEffect = new fx.Opacity(objLightboxImage, { duration: 350, onComplete: function() { imageDetailsEffect.custom(0,1); }});

		imageEffect.hide();

		

		imageDetailsEffect = new fx.Opacity('imageDataContainer', { duration: 400, onComplete: function() { navEffect.custom(0,1); }}); 

		imageDetailsEffect.hide();

		

		navEffect = new fx.Opacity('hoverNav', { duration: 100 });

		navEffect.hide();

	},

	

	//

	//	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]);

		overlayEffect.custom(0,0.8);

		

		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.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.show('loading');

		imageDetailsEffect.hide();

		imageEffect.hide();

		navEffect.hide();

		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]);

			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');



		// calculate size difference between new and old image, and resize if necessary

		wDiff = (this.wCur - borderSize * 2) - imgWidth;

		hDiff = (this.hCur - borderSize * 2) - imgHeight;

		

		// Resize the outerImageContainer very sexy like

		reHeight = new fx.Height('outerImageContainer', { duration: resizeDuration });

		reHeight.custom(Element.getHeight('outerImageContainer'),imgHeight+(borderSize*2)); 

		reWidth = new fx.Width('outerImageContainer', { duration: resizeDuration, onComplete: function() { imageEffect.custom(0,1); }});

		reWidth.custom(Element.getWidth('outerImageContainer'),imgWidth+(borderSize*2));



		// 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', imgHeight);

		Element.setHeight('nextLink', imgHeight);

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

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

		

		this.showImage();

	},

	

	//

	//	showImage()

	//	Display image and begin preloading neighbors.

	//

	showImage: function(){

		Element.hide('loading');

		myLightbox.updateDetails(); 

		this.preloadNeighborImages();

	},



	//

	//	updateDetails()

	//	Display caption, image number, and bottom nav.

	//

	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', "&nbsp; " + eval(activeImage + 1) + " / " + imageArray.length);

		}



		myLightbox.updateNav();

	},

	//

	//	updateNav()

	//	Display appropriate previous and next hover navigation.

	//

	updateNav: function() {



		// 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;

			}

		}



		// if not last image in set, display next image button

		if(activeImage != (imageArray.length - 1)){

			Element.show('nextLink');

			document.getElementById('nextLink').onclick = function() {

				myLightbox.changeImage(activeImage + 1); 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')){	// 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');

		imageEffect.toggle();

		overlayEffect.custom(0.8,0);

		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(); }