// $Id: lightbox.js 4561 2007-04-25 08:08:47Z fpaz $
/*
	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)
*/	

var loadingImage = '/images/loading.gif';		
var closeButton  = '/images/viewlarger-close.gif';		
var	TB_WIDTH      = 0;
var	TB_HEIGHT     = 0;
var imgdisplay_preload = new Image();

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

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

//
// showLightbox()
// 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 objLightboxThumb = document.getElementById('hoverbox');

	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScrollTop();
	// center loadingImage if it exists
	try{
    	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';
    	}
	}catch(e){

	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.width = (arrayPageSize[0] + 'px');
	objOverlay.style.height = (arrayPageSize[1] + 'px');	
//	positionOverlay();
	objOverlay.style.display = 'block';
	// preload image
	
    var pre_img = new Image();
    pre_img.src = objLink.href.toString().substr(0,Number(objLink.href.toString().length)-2) + '.d';    
    
	imgPreload = new Image();

	imgPreload.onload=function(){
       
		objImage.src = pre_img.src;

		// Resizing large images added by Christian Montoya
        resizeImage();
		// End Resizing
			
		window.onscroll = function(){
		    positionLightbox();
		}
        positionLightbox();
		
		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";
        }
	
		// After image is loaded, update the overlay height as the new image might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		positionOverlay();
		window.onresize = function() {
            resizeImage();
            positionLightbox();			    
		    positionOverlay();            
		    
		}    
    	
		objLightbox.style.display = 'block';		
		// Check for 'x' keypress
		listenKey();

		return false;
	}

	imgPreload.src = pre_img.src;
	
}

function positionLightbox() {
	var objLightbox = document.getElementById('lightbox');    
	var pagesize = getPageSize();	
	var arrayPageScroll = getPageScrollTop();
	
//	objLightbox.style.width  = TB_WIDTH+"px";
//	objLightbox.style.height = (TB_HEIGHT+40)+"px";		
	objLightbox.style.top    = (arrayPageScroll[1] + ((pagesize[1]-TB_HEIGHT)/2)-30)+"px"; 
	objLightbox.style.left   = ((pagesize[0] - TB_WIDTH)/2)+"px";
//    positionOverlay();
}

function positionOverlay(){
	var objOverlay = document.getElementById('overlay');    
    if (window.innerHeight && window.scrollMaxY) {	
		yScroll = window.innerHeight + window.scrollMaxY;
		xScroll = window.innerWidth;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		yScroll = document.body.scrollHeight;
		xScroll = document.body.scrollWidth;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		yScroll = document.body.offsetHeight;
		xScroll = document.body.clientWidth;
	}		
	objOverlay.style.height = yScroll + 'px';    
	objOverlay.style.width = xScroll + 'px';
}
function resizeImage(){
	var objImage = document.getElementById('lightboxImage');    
	var objLightboxDetails = document.getElementById('lightboxDetails');	
    var pagesize = getPageSize();
		var x = pagesize[0] - 150;
		var y = pagesize[1] - 150;
		var imageWidth = 408;//imgPreload.width;
		var imageHeight = 408;//imgPreload.height;
//		if (imageWidth > x) {
//			imageHeight = imageHeight * (x / imageWidth); 
//			imageWidth = x; 
//			if (imageHeight > y) { 
//				imageWidth = imageWidth * (y / imageHeight); 
//				imageHeight = y; 
//			}
//		} else if (imageHeight > y) { 
//			imageWidth = imageWidth * (y / imageHeight); 
//			imageHeight = y; 
//			if (imageWidth > x) { 
//				imageHeight = imageHeight * (x / imageWidth); 
//				imageWidth = x;
//			}
//		}
		TB_HEIGHT = imageHeight + 60;
		TB_WIDTH = imageWidth + 30;
				
		objImage.style.height = imageHeight+"px";
		objImage.style.width = imageWidth+"px";		
		objLightboxDetails.style.width = TB_WIDTH + 'px';		
}

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 = '';
}

//
// 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()
{
//	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];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
			anchor.onclick = function () {
			    showLightbox(this); 
			    return false;
			}
		}
	}
	
	var objBody = document.getElementsByTagName("body").item(0);
	
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	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 = getPageScrollTop();

	// 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);
	
	var objCloseImage = document.createElement('img');
	objCloseImage.setAttribute('id','closeButton');
	objCloseImage.src = './images/viewlarger-xclose.gif';
	objCloseImage.style.cursor = 'pointer';
	objCloseImage.style.border = 0;
	objCloseImage.title = 'Click to close'
	objCloseImage.onclick=hideLightbox;
	objLightbox.appendChild(objCloseImage);
	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objImage.className='lightboxImg';
	objLightbox.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');
	objLightboxDetails.appendChild(objCaption);

	var objhover = document.createElement("div");
	objhover.setAttribute('id','hoverbox');
	objLightbox.appendChild(objhover);

	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg');
	objKeyboardMsg.innerHTML = '<img style="border:0;cursor:pointer;" src="./images/viewlarger-close.gif" title="Click to close" onclick="hideLightbox();"/>';
	objLightbox.appendChild(objKeyboardMsg); 
		
    // create thumbnail images
	var thumb = document.getElementsByName('lightbox-thumb');
	for(var i=0;i<thumb.length;i++){
		var thumb_img=document.createElement("img");
		    thumb_img.className="thumbs";
            thumb_img.id = [i];
            imgdisplay_preload[i] = new Image();
            imgdisplay_preload[i].src = thumb[i].src.toString().substr(0,Number(thumb[i].src.toString().length)-2) + '.d';
			thumb_img.src = thumb[i].src;
			thumb_img.style.cursor = 'pointer';
			addEvent(thumb_img,'mouseover',toggle_image,false);
			objhover.appendChild(thumb_img);
	}	    

}

function getPageScrollTop(){
	var yScrolltop;
	if (self.pageYOffset) {
		yScrolltop = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScrolltop = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScrolltop = document.body.scrollTop;
	}
	arrayPageScroll = new Array('',yScrolltop); 
	return arrayPageScroll;
}

function getPageSize(){
	var de = document.documentElement;
	var w = window.innerWidth || self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth;
	var h = window.innerHeight || self.innerHeight || (de&&de.clientHeight) || document.body.clientHeight;
	
	arrayPageSize = new Array(w,h); 
	return arrayPageSize;
}
// switch main image onmouseover thumbnails
function toggle_image(e){
  var img_src=e.target ? e.target : e.srcElement;
  var objImage= document.getElementById('lightboxImage');
  objImage.src = imgdisplay_preload[img_src.id].src;
}

// run initLightbox onLoad
window.onload = function(){ 
    if(typeof(document.getElementById('lightbox'))=='undefined'){
        initLightbox();
    }    
}