/*
	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 = 'images/loading.gif';		
var closeButton = 'images/close.gif';		
var prevButton = 'images/prevlabel.gif';		
var nextButton = 'images/nextlabel.gif';		

var isLBinit = false;

var isYoutube = false;

var currImage = 0;
var LBArrayJson;
var imageArray; 
var objectId = 0; 
var objectName = "";  
var type = "";
var description = "";


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


//
// listenKey()
//
function listenKey () {	document.onkeypress = getKey; } 
  
//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink)
{
	if(!isLBinit){  setTimeout( 'showLightbox('+objLink+')',100); return;}
	// 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 objDivVideo = document.getElementById('divVideo');
	var objHoverNav = document.getElementById('hoverNav');
	//var objCloseButton = document.getElementById('closeButton');
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	
	objImage.style.display = 'none'; 
	objDivVideo.style.display = 'none'; 
	objLightboxDetails.style.display = 'none'; 
	objHoverNav.style.display = 'none'; 
	// objCloseButton.style.display = 'none'; 
	objLightbox.style.display = 'none'; 
	
	// 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()
	{
		var lightboxTop = 0;
		var lightboxLeft = 0;
		if(objLink.getAttribute('content_type')=='youtube')
		{
			VideoWidth = 640;
			VideoHeight = 480;
			objImage.style.display = 'none'; 
			objDivVideo.style.display = 'block'; 
			objDivVideo.innerHTML='<object width="'+VideoWidth+'" height="'+VideoHeight+'"><param name="movie" value="http://'+objLink.getAttribute('video_path') +'"></param><param name="wmode" value="transparent"></param><embed src="http://'+objLink.getAttribute('video_path') +'" type="application/x-shockwave-flash" wmode="transparent" width="'+VideoWidth+'" height="'+VideoHeight+'"></embed></object>';
			
			lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - VideoHeight) / 2);
			lightboxLeft = ((arrayPageSize[0] - 20 -  VideoWidth ) / 2);
			objLightboxDetails.style.width = VideoWidth + 'px';
			isYoutube = true;
		} 
		else
		{
			objDivVideo.style.display = 'none'; 
			objImage.style.display = 'block'; 
		 	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
			lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
			lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
			objLightboxDetails.style.width = imgPreload.width + 'px';
			isYoutube = false;
		}
			
			
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px"; 
		var codeHtmlLB = "<div id=\"keyboardMsg\">press <a href=\"#\" onclick=\"isYoutube = false; hideLightbox(); return false;\"><kbd>x</kbd></a> to close</div>";
		if(objLink.getAttribute('title'))
		{ 
			objCaption.style.display = 'block';
			//objCaption.style.width = imgPreload.width + 'px';  
			
			if(type=="place")
			{
				codeHtmlLB += objLink.getAttribute('datetime')+' - <a href="placemarkDetails.php?id='+objLink.getAttribute('mainId')+'"><b>' + objLink.getAttribute('title') + '</b></a>.<br><span style="font-size:1em;">'; 
				if(objectId>0)
					codeHtmlLB += '<b>' + (currImage+1) + '/' + imageArray.length + '</b> of Trip: <a href="tripDetails.php?id='+objectId+'">' + objectName + '</a>.'; 
				codeHtmlLB += ' User: <a href="userDetails.php?id='+objLink.getAttribute('user_id')+'">' + objLink.getAttribute('username') + '</a></span>.';  
				codeHtmlLB += '<br><span style="font-size:1em;">' +description+ '</span>';
			 
			}
			else if(type=="wikicontent" || type=="wiki")
			{
				codeHtmlLB += '<b>Photo ' + (currImage+1) + '/' + imageArray.length + '</b> of <a href="wikipoiDetails.php?id='+objectId+'">' + objectName + '</a> <span style="font-size:1em;">';  
				if(objLink.getAttribute('user_id')>0)
				{
					 codeHtmlLB += '&nbsp;&nbsp;&nbsp; User: <a href="userDetails.php?id='+objLink.getAttribute('user_id')+'">' + objLink.getAttribute('username') + '</a></span>.';  
				}
				codeHtmlLB += '<br>' +description+ '</span>'; 
			} 
			objCaption.innerHTML = codeHtmlLB;				
		} 
		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'; 
		objLightbox.style.display = 'block'; 
		objLightboxDetails.style.display = 'block'; 
		
		objHoverNav.style.display = 'block'; 
		//objCloseButton.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();
	
		return false;
	} 
	imgPreload.src = objLink.href; 
}

//
// hideLightbox()
//
function hideLightbox()
{
	 if(isYoutube) return;
	 
	// 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 = '';
}  

function loadLB(id_,type_)
{ 
	if(!isLBinit){  setTimeout( 'loadLB('+id_+',"'+type_+'")',100); return;}
	type = type_;
	currImage = 0;
	GDownloadUrl("getLBphoto.php?id="+id_+"&type="+type, function(data, responseCode) { parseLBJson(data);});
}

function parseLBJson (doc) 
{  
	LBArrayJson = eval("("+  doc +")");  
	imageArray = LBArrayJson[0]["places"];   
	objectId = LBArrayJson[0]["objectId"]; 
 	objectName = LBArrayJson[0]["objectName"];   	
	if (imageArray.length==0)
	{
		var urlTo = "";
		switch(type)
		{
			case  "wiki": urlTo = "wikipoiDetails.php?id="; break;
			case  "wikicontent": urlTo = "wikipoiDetails.php?id="; break;
			case  "place": urlTo = "placemarkDetails.php?id="; break; // not exists
		}
		window.location = urlTo + objectId;
		return false;	
	}
	else if (imageArray.length==1)
	{
		if(imageArray[0]['imgSrc'].indexOf('/none.jpg')>0)
		{
			var urlTo = "";
			switch(type)
			{
				case  "wiki": urlTo = "wikipoiDetails.php?id="; break;
				case  "wikicontent": urlTo = "wikipoiDetails.php?id="; break;
				case  "place": urlTo = "placemarkDetails.php?id="; break; 
			}
			window.location = urlTo + imageArray[0]['id'];
			return false;	 
		}
	}
	
	
	moveToLB(LBArrayJson[0]["position"]); 
	
} 

function moveToLB(v)
{	 
	currImage += v;
	if (currImage<0) currImage=0;
	if (currImage>imageArray.length-1) currImage=imageArray.length-1;
	document.getElementById("prevLink").style.visibility = (currImage==0)?"hidden":"visible"; 
	document.getElementById("nextLink").style.visibility = (currImage==imageArray.length-1)?"hidden":"visible";   
	var objLink = document.createElement("a");
	objLink.setAttribute('mainId', imageArray[currImage]['id'] );
	objLink.setAttribute('title', imageArray[currImage]['title'] );
	objLink.setAttribute('href', imageArray[currImage]['imgSrc'] ); 
	
	if(type == "place")
	{
		objLink.setAttribute('user_id', imageArray[currImage]['user_id'] );
		objLink.setAttribute('username', imageArray[currImage]['username'] );
		objLink.setAttribute('datetime', imageArray[currImage]['datetime'] );
		objLink.setAttribute('content_type', imageArray[currImage]['content_type'] );
		objLink.setAttribute('video_path', imageArray[currImage]['video_path'] );
		description = imageArray[currImage]['description'];
	} 
	else if(type == "wikicontent" || type == "wiki")
	{
		description = imageArray[currImage]['description'];
		objLink.setAttribute('user_id', imageArray[currImage]['user_id'] );
		objLink.setAttribute('username', imageArray[currImage]['user_username'] );
	}
	
	showLightbox(objLink)
}

//
// 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;}
		}
	}
*/
	// 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 details div, a container for the caption and keyboard message
	var objLightboxNav = document.createElement("div");
	objLightboxNav.setAttribute('id','hoverNav');
	objLightbox.appendChild(objLightboxNav);

	
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('id','prevLink');
	objLink.setAttribute('title','previous image');
	objLink.onclick = function () {moveToLB(-1); return false;}
	objLightboxNav.appendChild(objLink);

	var objPrevButton = document.createElement("img");
	objPrevButton.src = prevButton;
	objPrevButton.setAttribute('id','prevButton');
	objPrevButton.style.position = 'absolute';
	objPrevButton.style.left = '0';
	objPrevButton.style.zIndex = '200';
	objLink.appendChild(objPrevButton);
		
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('id','nextLink');
	objLink.setAttribute('title','next image');
	objLink.onclick = function () {moveToLB(1); return false;}
	objLightboxNav.appendChild(objLink);
	
	 
	var objNextButton = document.createElement("img");
	objNextButton.src = nextButton;
	objNextButton.setAttribute('id','nextButton');
	objNextButton.style.position = 'absolute';
	objNextButton.style.right = '0';
	objNextButton.style.zIndex = '200';
	objLink.appendChild(objNextButton); 
	
	// 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';		
		objCloseButton.onclick = function () {isYoutube = false; hideLightbox(); return false;}
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLink.appendChild(objImage);
	
	var objDivVideo = document.createElement("div");
	objDivVideo.setAttribute('id','divVideo'); 
	objLink.appendChild(objDivVideo);
	
	// 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="isYoutube = false; hideLightbox(); return false;"><kbd>x</kbd></a> to close';
	objLightboxDetails.appendChild(objKeyboardMsg);
*/
	isLBinit = true;
}