// -----------------------------------------------------------------------------------
//
//	Lightbox v2.03
//	by Lokesh Dhakar - http://www.huddletogether.com
//	4/9/06
//
//	For more information on this script, visit:
//	http://huddletogether.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//	
//	Credit also due to those who have helped, inspired, and made their code available to the public.
//	Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.org), Thomas Fuchs(mir.aculo.us), and others.
//
//
// -----------------------------------------------------------------------------------
/*

	Table of Contents
	-----------------
	Configuration
	Global Variables

	Extending Built-in Objects	
	- Object.extend(Element)
	- Array.prototype.removeDuplicates()
	- Array.prototype.empty()

	Lightbox Class Declaration
	- initialize()
	- start()
	- changeImage()
	- resizeImageContainer()
	- showImage()
	- updateDetails()
	- updateNav()
	- enableKeyboardNav()
	- disableKeyboardNav()
	- keyboardAction()
	- preloadNeighborImages()
	- end()
	
	Miscellaneous Functions
	- getPageScroll()
	- getPageSize()
	- getKey()
	- listenKey()
	- showSelectBoxes()
	- hideSelectBoxes()
	- showFlash()
	- hideFlash()
	- pause()
	- initLightbox()
	
	Function Calls
	- addLoadEvent(initLightbox)
	
*/
// -----------------------------------------------------------------------------------

//
//	Configuration
//
var fileLoadingImage = "/img/lightbox/loading.gif";		
var fileBottomNavCloseImage = "/img/lightbox/closelabel.gif";

var animate = true;	// toggles resizing animations
var resizeSpeed = 7;	// controls the speed of the image resizing animations (1=slowest and 10=fastest)

var borderSize = 10;	//if you adjust the padding in the CSS, you will need to update this variable

// -----------------------------------------------------------------------------------

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

if(animate == true){
	overlayDuration = 0.2;	// shadow fade in/out duration
	if(resizeSpeed > 10){ resizeSpeed = 10;}
	if(resizeSpeed < 1){ resizeSpeed = 1;}
	resizeDuration = (11 - resizeSpeed) * 0.15;
} else { 
	overlayDuration = 0;
	resizeDuration = 0;
}

// -----------------------------------------------------------------------------------

//
//	Additional methods for Element added by SU, Couloir
//	- further additions by Lokesh Dhakar (huddletogether.com)
//
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 = 0; i < this.length; i++){
        for(j = this.length-1; j>i; j--){        
            if(this[i][0] == this[j][0]){
                this.splice(j,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()
   // Constructor runs on completion of the DOM loading. Loops through anchor tags looking for 
   // 'lightbox' references and applies onclick events to appropriate links. The 2nd section of
   // the function inserts html at the bottom of the page which is used to display the shadow 
   // overlay and the image container.
   //
   initialize: function() {
      if (!document.getElementsByTagName) { return; }
      var anchors = document.getElementsByTagName('a');
      var areas = document.getElementsByTagName('area');

      // loop through all anchor tags
      for (var i = 0; i < anchors.length; i++) {
         var anchor = anchors[i];

         var relAttribute = String(anchor.getAttribute('rel'));

         // use the string.match() method to catch 'lightbox' references in the rel attribute
         if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))) {
            anchor.onclick = function() { myLightbox.start(this); return false; }
         }
      }

      // loop through all area tags
      // todo: combine anchor & area tag loops
      for (var i = 0; i < areas.length; i++) {
         var area = areas[i];

         var relAttribute = String(area.getAttribute('rel'));

         // use the string.match() method to catch 'lightbox' references in the rel attribute
         if (area.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))) {
            area.onclick = function() { myLightbox.start(this); return false; }
         }
      }

      // The rest of this code inserts html at the bottom of the page that looks similar to this:
      //
      //	<div id="overlay"></div>
      //	<div id="lightbox">
      //		<div id="outerImageContainer">
      //			<div id="imageContainer">
      //				<img id="lightboxImage">
      //				<div style="" id="hoverNav">
      //					<a href="#" id="prevLink"></a>
      //					<a href="#" id="nextLink"></a>
      //				</div>
      //				<div id="loading">
      //					<a href="#" id="loadingLink">
      //						<img src="images/loading.gif">
      //					</a>
      //				</div>
      //			</div>
      //		</div>
      //		<div id="imageDataContainer">
      //			<div id="imageData">
      //				<div id="imageDetails">
      //					<span id="caption"></span>
      //					<span id="numberDisplay"></span>
      //				</div>
      //				<div id="bottomNav">
      //					<a href="#" id="bottomNavClose">
      //						<img src="images/close.gif">
      //					</a>
      //				</div>
      //			</div>
      //		</div>
      //	</div>


      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(); }
      objBody.appendChild(objOverlay);

      var objLightbox = document.createElement("div");
      objLightbox.setAttribute('id', 'lightbox');
      objLightbox.style.display = 'none';
      objLightbox.onclick = function(e) {	// close Lightbox is user clicks shadow overlay
         if (!e) var e = window.event;
         var clickObj = Event.element(e).id;
         if (clickObj == 'lightbox') {
            myLightbox.end();
         }
      };
      objBody.appendChild(objLightbox);

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

      // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
      // If animations are turned off, it will be hidden as to prevent a flicker of a
      // white 250 by 250 box.
      if (animate) {
         Element.setWidth('outerImageContainer', 250);
         Element.setHeight('outerImageContainer', 250);
      } else {
         Element.setWidth('outerImageContainer', 1);
         Element.setHeight('outerImageContainer', 1);
      }

      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();
      hideFlash();

      // stretch overlay to fill page and fade in
      var arrayPageSize = getPageSize();
      Element.setHeight('overlay', arrayPageSize[1]);

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

      imageArray = [];
      imageNum = 0;

      if (!document.getElementsByTagName) { return; }
      var anchors = document.getElementsByTagName('a');

      // if image is NOT part of a set..
      if ((imageLink.getAttribute('rel') == 'lightbox')) {
         // add single image to imageArray
         imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));
      } else {
         // if image is part of a set..

         // loop through anchors, find other images in set, and add them to imageArray
         for (var i = 0; i < anchors.length; i++) {
            var anchor = anchors[i];
            if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel'))) {
               imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
            }
         }
         imageArray.removeDuplicates();
         while (imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++; }
      }

      // calculate top offset for the lightbox and display 
      var arrayPageScroll = getPageScroll();
      var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);

      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
      if (animate) { 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 curren width and height
      this.widthCurrent = Element.getWidth('outerImageContainer');
      this.heightCurrent = Element.getHeight('outerImageContainer');

      // get new width and height
      var widthNew = (imgWidth + (borderSize * 2));
      var heightNew = (imgHeight + (borderSize * 2));

      // scalars based on change from old to new
      this.xScale = (widthNew / this.widthCurrent) * 100;
      this.yScale = (heightNew / this.heightCurrent) * 100;

      // calculate size difference between new and old image, and resize if necessary
      wDiff = this.widthCurrent - widthNew;
      hDiff = this.heightCurrent - heightNew;

      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', widthNew);

      this.showImage();
   },

   //
   //	showImage()
   //	Display image and begin preloading neighbors.
   //
   showImage: function() {
      Element.hide('loading');
      new Effect.Appear('lightboxImage', { duration: resizeDuration, 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, from: 0.0, to: 1.0 }),
			  new Effect.Appear('imageDataContainer', { sync: true, duration: resizeDuration })],
			{ duration: resizeDuration, afterFinish: function() {
			   // update overlay size and update nav
			   var arrayPageSize = getPageSize();
			   Element.setHeight('overlay', arrayPageSize[1]);
			   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();
      highResFunc();
   },

   //
   //	enableKeyboardNav()
   //
   enableKeyboardNav: function() {
      document.onkeydown = this.keyboardAction;
   },

   //
   //	disableKeyboardNav()
   //
   disableKeyboardNav: function() {
      document.onkeydown = '';
   },

   //
   //	keyboardAction()
   //
   keyboardAction: function(e) {
      if (e == null) { // ie
         keycode = event.keyCode;
         escapeKey = 27;
      } else { // mozilla
         keycode = e.keyCode;
         escapeKey = e.DOM_VK_ESCAPE;
      }

      key = String.fromCharCode(keycode).toLowerCase();

      if ((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)) {	// close lightbox
         myLightbox.end();
      } else if ((key == 'p') || (keycode == 37)) {	// display previous image
         if (activeImage != 0) {
            myLightbox.disableKeyboardNav();
            myLightbox.changeImage(activeImage - 1);
         }
      } else if ((key == 'n') || (keycode == 39)) {	// 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: overlayDuration });
      showSelectBoxes();
      showFlash();
   }
}

// -----------------------------------------------------------------------------------

//
// 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(){
	var selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
}

// ---------------------------------------------------

function hideSelectBoxes(){
	var selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "hidden";
	}
}

// ---------------------------------------------------

function showFlash(){
	var flashObjects = document.getElementsByTagName("object");
	for (i = 0; i != flashObjects.length; i++) {
		flashObjects[i].style.visibility = "visible";
	}

	var flashEmbeds = document.getElementsByTagName("embeds");
	for (i = 0; i != flashEmbeds.length; i++) {
		flashEmbeds[i].style.visibility = "visible";
	}
}

// ---------------------------------------------------

function hideFlash(){
	var flashObjects = document.getElementsByTagName("object");
	for (i = 0; i != flashObjects.length; i++) {
		flashObjects[i].style.visibility = "hidden";
	}

	var flashEmbeds = document.getElementsByTagName("embeds");
	for (i = 0; i != flashEmbeds.length; i++) {
		flashEmbeds[i].style.visibility = "hidden";
	}

}


// ---------------------------------------------------

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Help from Ran Bar-On [ran2103@gmail.com]
//

function pause(ms){
	var date = new Date();
	curDate = null;
	do{var curDate = new Date();}
	while( curDate - date < ms);
}
/*
function pause(numberMillis) {
	var curently = new Date().getTime() + sender;
	while (new Date().getTime();	
}
*/
// ---------------------------------------------------



function initLightbox() { myLightbox = new Lightbox();}
Event.observe(window, 'load', initLightbox, false);

function highResFunc() {
   var anchors = document.getElementsByTagName('a');
   for (var i = 0; i < anchors.length; i++) {
      var anchor = anchors[i];

      var relAttribute = String(anchor.getAttribute('rel'));

      // use the string.match() method to catch 'lightbox' references in the rel attribute
      if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))) {
         anchor.onclick = function() { myLightbox.start(this); return false; }
      }
   } 
}