var fileLoadingImage = "/wp-images/loading.gif";		
var fileBottomNavCloseImage = "/wp-images/closelabel.gif";
var resizeSpeed = 10;
var borderSize = 10;

//	Global Variables
var imageArray = new Array;
var activeImage;

if(resizeSpeed > 10){ resizeSpeed = 10;}
if(resizeSpeed < 1){ resizeSpeed = 1;}
resizeDuration = (11 - resizeSpeed) * 0.15;

Object.extend(Element, {
getWidth: function(element) {
element = $(element);
return element.offsetWidth; 
},
setWidth: function(element,w) {
element = $(element);
element.style.width = w +"px";
},
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; 
},
setHref: function(element,href) {
	    element = $(element);
	    element.href = href; 
	 },
setInnerHTML: function(element,content) {
		 element = $(element);
		 element.innerHTML = content;
	      }
});

//	Extending built-in Array object
//	- array.removeDuplicates()
//	- array.empty()
//
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();
   }
}

//
//	Lightbox Class Declaration
//	- initialize()
//	- start()
//	- changeImage()
//	- resizeImageContainer()
//	- showImage()
//	- updateDetails()
//	- updateNav()
//	- enableKeyboardNav()
//	- disableKeyboardNav()
//	- keyboardNavAction()
//	- preloadNeighborImages()
//	- end()
//
//	Structuring of code inspired by Scott Upton (http://www.uptonic.com/)
//
var Lightbox = Class.create();

Lightbox.prototype = {

initialize: function() {	
	       if (!document.getElementsByTagName){ return; }

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

	       var objOverlay = document.createElement("div");
	       objOverlay.setAttribute('id','overlay');
	       objOverlay.style.display = 'none';
	       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);
	    },

	    //
	    //	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]);
	  new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: 0.8 });

	  imageArray = [];
	  imageNum = 0;		

	  if (!document.getElementsByTagName){ return; }

	  imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));			

	  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');
		Element.hide('lightboxImage');
		Element.hide('hoverNav');
		Element.hide('prevLink');
		Element.hide('nextLink');
		Element.hide('imageDataContainer');
		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');

			 // scalars based on change from old to new
			 this.xScale = ((imgWidth  + (borderSize * 2)) / this.wCur) * 100;
			 this.yScale = ((imgHeight  + (borderSize * 2)) / this.hCur) * 100;

			 // calculate size difference between new and old image, and resize if necessary
			 wDiff = (this.wCur - borderSize * 2) - imgWidth;
			 hDiff = (this.hCur - borderSize * 2) - imgHeight;

			 if(!( hDiff == 0)){ new Effect.Scale('outerImageContainer', this.yScale, {scaleX: false, duration: resizeDuration, queue: 'front'}); }
			 if(!( wDiff == 0)){ new Effect.Scale('outerImageContainer', this.xScale, {scaleY: false, delay: resizeDuration, duration: resizeDuration}); }

			 // 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));

			 this.showImage();
		      },

		      //
		      //	showImage()
		      //	Display image and begin preloading neighbors.
		      //
showImage: function(){
	      Element.hide('loading');
	      new Effect.Appear('lightboxImage', { duration: 0.5, queue: 'end', afterFinish: function(){	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', "Image " + eval(activeImage + 1) + " of " + imageArray.length);
		  }

		  new Effect.Parallel(
			[ new Effect.SlideDown( 'imageDataContainer', { sync: true, duration: resizeDuration + 0.25, from: 0.0, to: 1.0 }), 
			new Effect.Appear('imageDataContainer', { sync: true, duration: 1.0 }) ], 
			{ duration: 0.65, afterFinish: function() { myLightbox.updateNav();} } 
			);
	       },

	       //
	       //	updateNav()
	       //	Display appropriate previous and next hover navigation.
	       //
updateNav: function() {

	      Element.show('hoverNav');				

	      // 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');
	new Effect.Fade('overlay', { duration: 0.2});
	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(); }