/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)
	
	Table of Contents
	-----------------
	Configuration
	
	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = 'js/lightbox/throbber.gif';		
var closeButton = 'js/close.png';
var previmage = 'js/lightbox/left.png';	
var nextimage = 'js/lightbox/right.png';	
var currentlySelected;
var lightified = new Array;
var currentid;
var padding = 4;





//
// 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;
}


//
// 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;
	}
}

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//

function getKey(e){
	if (!e) { // ie
		e = window.event;
	}
	
	keycode = e.keyCode;
	key = String.fromCharCode(keycode).toLowerCase();
	if(key == 'x'){ hideLightbox(); }
	else if(keycode == 39){ showNextImage();} //right arrow
	else if(keycode == 37){ showPreviousImage();} //left arrow
		
	//safari needs this, or the keypress fires twice...
	return false;
}
//added by Jonne
//these should set opacity of the next/prev buttons correctly
function hide(element)	{
document.getElementById(element).style.opacity='0.5';
document.getElementById(element).style.filter='alpha(opacity=50)';
document.getElementById(element).style.cursor='default';
}
function show(element)	{
document.getElementById(element).style.opacity='1';
document.getElementById(element).style.filter='alpha(opacity=100)';
document.getElementById(element).style.cursor='pointer';
}
//added by Jonne
function loadImage(url,nexturl)	{
	if(url!='none')	
		{
		var objImage = document.getElementById('lightboxImage');
		objImage.src = null;
		objImage.src = url;
		objImage.onload=function(){
			center(objImage);
			}
		}
	if(nexturl!='none')
		{
		var preloadNext = new Image();
		preloadNext.src = nexturl;
		}
	}
//added by Jonne
function checkForMultiple()	{
		//show navblock
		document.getElementById('multipleNavContainer').style.display='block';
		if(lightified.length>1)
			{
			show('next');
			show('progress');
			show('prev');
			//detect progress, and display it
			urlChunks = currentlySelected.href.split('/');
			currentid=currentlySelected.id;
			//console.log(currentid);
			imgname = urlChunks[(urlChunks.length-1)];
			maxamount = lightified.length;
			var thiselement;
			for(i=0;i<maxamount;i++)
				{
				hrefarray = lightified[i].href.split('/');
				if(imgname==hrefarray[hrefarray.length-1]){
					thiselement=i+1;
					}
				}
			document.getElementById('progress').innerHTML=thiselement+' / '+maxamount;
			}else{
			document.getElementById('next').style.display='none';
			document.getElementById('prev').style.display='none';
			document.getElementById('progress').style.display='none';
			}
		}
//added by Jonne
function showNextImage()
	{
	currentnumber = currentid.substring(1);
	currentnumber++;
	if(currentnumber>maxamount)
		{
		currentnumber=1;
		}
	newurl=getLightBoxURL(document.getElementById('x'+currentnumber));
	//console.log(newurl);
	//document.getElementById('lightboxImage').src=newurl;
	loadImage(newurl,'none');
	currentid='x'+currentnumber;
	document.getElementById('progress').innerHTML=currentnumber+' / '+maxamount;
	var objLink = document.getElementById(currentid);
	document.getElementById('lightboxCaption').innerHTML ='<a href="'+objLink.href+'">'+objLink.getAttribute('title')+'</a>';
	}
//added by Jonne
function showPreviousImage()
	{
	currentnumber = currentid.substring(1);
	currentnumber--;
	if(currentnumber<1)
		{
		currentnumber=maxamount;
		}
	newurl=getLightBoxURL(document.getElementById('x'+currentnumber));
	//console.log(newurl);
	//document.getElementById('lightboxImage').src=newurl;
	loadImage(newurl),'none';
	currentid='x'+currentnumber;
	document.getElementById('progress').innerHTML=currentnumber+' / '+maxamount;
	var objLink = document.getElementById(currentid);
	document.getElementById('lightboxCaption').innerHTML='<a href="'+objLink.href+'">'+objLink.getAttribute('title')+'</a>';
	}
function center(imageToCenter){
		/*workaround for Safari bug:
		http://www.quirksmode.org/bugreports/archives/2005/03/Safari_Image_src_swap_resize_bug.html */
		if (navigator.userAgent.indexOf('Safari')!=-1) {
			var elt = document.getElementById("lightboxImage");
			elt.style.height = (elt.height - 1) + "px";
			elt.style.height = (elt.height) + "px";
		}
		var lightboxLeft = ((arrayPageSize[0] - (padding*4) - imageToCenter.width) / 2);
		//console.log(lightboxLeft);
		var objLightbox = document.getElementById('lightbox');
		//console.log(imageToCenter.width);
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
		/*objLightbox.style.right = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";*/
		objLightbox.style.width = imageToCenter.width+(padding*2) + 'px';
		var objLightboxDetails = document.getElementById('lightboxDetails');
		objLightboxDetails.style.width = imageToCenter.width +padding+'px';
		var objLightboxCaption = document.getElementById('lightboxCaption')
		objLightboxCaption.style.width = imageToCenter.width +padding+ 'px';
		/*window.alert(document.getElementById('lightboxCaption').style.width);*/
	}
//
// listenKey()
//
function listenKey () {	document.onkeydown = getKey; }
	

//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink)
{
	/* fix flash + firefox + linux issue */
	fixFlashFirefoxLinux('hide');
	// prep objects
	currentlySelected = objLink;
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objCaption = document.getElementById('lightboxCaption');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var objLightboxDetails = document.getElementById('lightboxDetails');

	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// center loadingImage if it exists
	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';

	// preload image
	imgPreload = new Image();
	imgPreload.onload=function(){
		
		//objImage.src = objLink.href;
		objImage.src = getLightBoxURL(objLink);
		
		// center lightbox and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - (padding*4) - imgPreload.width) / 2);
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
		objLightbox.style.right = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";


		objLightboxDetails.style.width = imgPreload.width + 'px';
		
		if(objLink.getAttribute('title')){
			objCaption.style.display = 'block';
			//objCaption.style.width = imgPreload.width + 'px';
			objCaption.innerHTML = '<a href="'+objLink.href+'">'+objLink.getAttribute('title')+'</a>';
		} else {
			objCaption.style.display = 'none';
		}
		
		// A small pause between the image loading and displaying is required with IE,
		// this prevents the previous image displaying for a short burst causing flicker.
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		} 

		if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }

		// Hide select boxes as they will 'peek' through the image in IE
		selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) {
                selects[i].style.visibility = "hidden";
        }

	
		objLightbox.style.display = 'block';

		// After image is loaded, update the overlay height as the new image might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		
		// Check for 'x' keypress
		listenKey();
		//check for multiple files
		checkForMultiple();
		//make sure for IE
		center(objImage);
		
		return false;
	}

	//imgPreload.src = objLink.href;
	imgPreload.src = getLightBoxURL(objLink);
}



//
// hideLightbox()
//
function hideLightbox()
{
	// get objects
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');

	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';

	// make select boxes visible
	selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
	/* fix flash + firefox + linux issue */
	fixFlashFirefoxLinux('show');
	// disable keypress listener
	document.onkeypress = '';
}




//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{
	lightified = new Array;
	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];
		relRegex = new RegExp(/lightbox\[[a-z0-9_\-\.\/?&;=]*\]/i);
		
			if (anchor.getAttribute("href") && anchor.getAttribute("rel")!=null && (anchor.getAttribute("rel").match(relRegex))){
				//make a list of lightified objects
				lightified.push(anchor);
				lightified[(lightified.length-1)].setAttribute('id','x'+lightified.length);
				anchor.onclick = function () {showLightbox(this); return false;}
			}
	}

	// the rest of this code inserts html at the top of the page that looks like this:
	//
	// <div id="overlay">
	//		<a href="#" onclick="hideLightbox(); return false;"><img width="90" height="90" id="loadingImage" /></a>
	//	</div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox(); return false;" title="Klik op de foto om te sluiten">
	//			<img id="closeButton" />		
	//			<img id="lightboxImage" />
	//		</a>
	//		<div id="lightboxDetails">
	//			<div id="lightboxCaption"></div>
	//			<div id="keyboardMsg"></div>
	//			<div id="nextButton"></div>
	//		</div>
	// </div>
	
	var objBody = document.getElementsByTagName("body").item(0);
	
	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// preload and create loader image
	var imgPreloader = new Image();
	
	// if loader image found, create link to hide lightbox and create loadingimage
	imgPreloader.onload=function(){

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','loadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '150';
		objLoadingImageLink.appendChild(objLoadingImage);

		imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs

		return false;
	}

	imgPreloader.src = loadingImage;

	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';	
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
		
	//create navigation div (for slideshow)
	var objMultipleNavContainer = document.createElement("div");
	objMultipleNavContainer.setAttribute('id','multipleNavContainer');
	objMultipleNavContainer.style.display = 'none';
	objMultipleNavContainer.innerHTML = '<span id="prev" onclick="javascript:showPreviousImage()"><img src="'+previmage+'" /></span><span id="progress"></span><span id="next" onclick="javascript:showNextImage()"><img src="'+nextimage+'" /></span>';
	objLightbox.appendChild(objMultipleNavContainer);
	
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Click to close');
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);

	// preload and create close button image
	var imgPreloadCloseButton = new Image();

	// if close button image found, 
	imgPreloadCloseButton.onload=function(){

		var objCloseButton = document.createElement("img");
		objCloseButton.src = closeButton;
		objCloseButton.setAttribute('id','closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLink.appendChild(objImage);
	
	// create details div, a container for the caption and keyboard message
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id','lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);

	// create caption
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','lightboxCaption');
	objCaption.style.display = 'none';
	objLightboxDetails.appendChild(objCaption);

	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg');
	objKeyboardMsg.innerHTML = '';
	objLightboxDetails.appendChild(objKeyboardMsg);

	//create bottom message
	var objBottomMsg = document.createElement("div");
	objBottomMsg.setAttribute('id','bottomMsg');
	var at='@';
	objBottomMsg.innerHTML = '';
	objLightboxDetails.appendChild(objBottomMsg);
}


function getLightBoxURL(e)
	{
	var filenameRegex = new RegExp(/lightbox\[([a-z0-9_\-\.\/?&;=]*)\]/i);
	var filename= e.getAttribute("rel").match(filenameRegex)[1];
	return filename;
	}

function lightBox(){
	initLightbox();
	}
/* this function detects if the browser is Firefox on Linux/BSD.
 * if it is, it will hide all flash elements to get rid of
 * the wmode bug where they peek through the overlay
 *  */
function fixFlashFirefoxLinux(action){
	/* check if we're dealing with Gecko on Linux 
	 * checking user agents is evil, but if you have a better idea, 
	 * let me know
	 * it's not like you're going to miss the flash anyway
	 * */
	var useragent = navigator.userAgent;
	if(useragent.indexOf('X11')>0 && useragent.indexOf('Gecko')>0 && useragent.indexOf('like Gecko')==-1){
		var objects = document.getElementsByTagName('OBJECT');
		for(var i=0;i<objects.length;i++)
			{
			if(action=='show')
				{
				objects[i].style.display='block';
				}else{
				objects[i].style.display='none';
				}
			}
		}
	return false;
	}