// ================================================
// LIGHTBOX JS - Customized v1.1
// ================================================
//
//	Lightbox JS: Fullsize Image Overlays 
//	by Lokesh Dhakar - http://huddletogether.com/projects/lightbox/
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//
//	Modifications by Julien Perrier Apr 22nd. v1.1
//	- No captions
//	- Code rewriting
//	- ESC instead of X for closing
//	- Adds lightbox behavior to all .jpg links found on page (no need for "rel=lightbox")
//


// ================================================
// CONFIGURATION
// ================================================

var loadingImage = '/lightbox1/loading.gif';		
//var closeButton = 'close.gif';		



// ================================================
// FUNCTIONS
// ================================================

// ---------------------------------
// GET PAGE SCROLL()
// 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) {	yScroll = document.documentElement.scrollTop; } // Explorer 6 Strict
	else if (document.body) { yScroll = document.body.scrollTop; } // all other Explorers

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

// ---------------------------------
// GET PAGE SIZE() 
// 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) { xScroll = document.body.scrollWidth; yScroll = document.body.scrollHeight; } // all but Explorer Mac 
	else { xScroll = document.body.offsetWidth; yScroll = document.body.offsetHeight; } // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
	
	var windowWidth, windowHeight;
	if (self.innerHeight) { windowWidth = self.innerWidth; windowHeight = self.innerHeight; } 	// all except Explorer
	else if (document.documentElement && document.documentElement.clientHeight) { windowWidth = document.documentElement.clientWidth; windowHeight = document.documentElement.clientHeight; }  // Explorer 6 Strict Mode
	else if (document.body) { windowWidth = document.body.clientWidth; windowHeight = document.body.clientHeight; } // other Explorers
	
	// 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() 
// 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; } }
}


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


// ---------------------------------
// GET KEY() - Gets keycode. If ESC is pressed then it hides the lightbox.
//
function getKey(e){
	if (e == null) {  keycode = event.keyCode; } // ie
	else { keycode = e.which;} // mozilla
	if(keycode == 0 || keycode == 27){ hideLightbox(); }
}
	
	
// ---------------------------------
// SHOW LIGHTBOX() 
// Preloads images. Pleaces new image in lightbox then centers and displays.
function showLightbox(objLink)
{
	// prep objects
	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';

	imgPreload = new Image(); // preload image

	imgPreload.onload=function(){
		objImage.src = objLink.href;

		// 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] - 20 - imgPreload.width) / 2);
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (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 = objLink.getAttribute('title'); } 
		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');
		
		listenKey(); // Check for 'x' keypress

		return false;
	}

	imgPreload.src = objLink.href;
}

// ---------------------------------
// HIDE LIGHTBOX() 
//
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";
	}

	// disable keypress listener
	document.onkeypress = '';
}


// ---------------------------------
// INIT LIGHTBOX()
//
function initLightbox()
{
	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 hrefAttribute = String(anchor.getAttribute('href'));
		if (hrefAttribute.toLowerCase().indexOf('.jpg') == hrefAttribute.length - 4){ anchor.onclick = function () { showLightbox(this); return false; } } // tries to find '.jpg' at the end of the href attribute
	}

	// 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 id="loadingImage" /></a>
	//	</div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
	//			<img id="closeButton" />		
	//			<img id="lightboxImage" />
	//		</a>
	//		<div id="lightboxDetails">
	//			<div id="lightboxCaption"></div>
	//			<div id="keyboardMsg"></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 link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Click to close');
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);

	// 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 = 'press <a href="#" onclick="hideLightbox(); return false;"><kbd>x</kbd></a> to close';
	objLightboxDetails.appendChild(objKeyboardMsg);*/
}

// ---------------------------------
// ADD LOAD EVENT()
// Adds event to window.onload without overwriting currently assigned onload functions. Function found at Simon Willison's weblog - http://simon.incutio.com/
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){ window.onload = func; } 
	else { window.onload = function(){ oldonload(); func(); } }
}

// ================================================
// EXECUTION
// ================================================
addLoadEvent(initLightbox);	// run initLightbox onLoad