// -----------------------------------------------------------------------------------
//
//	Lightbox v2.04
//	by Lokesh Dhakar - http://www.lokeshdhakar.com
//	Last Modification: 2/9/08
//
//	For more information, visit:
//	http://lokeshdhakar.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//  	- Free for use in both personal and commercial projects
//		- Attribution requires leaving author name, author link, and the license info intact.
//	
//  Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
//  		Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
//
// -----------------------------------------------------------------------------------
/*

Table of Contents
-----------------
Configuration

Lightbox Class Declaration
- initialize()
- updateImageList()
- start()
- changeImage()
- resizeImageContainer()
- showImage()
- updateDetails()
- updateNav()
- enableKeyboardNav()
- disableKeyboardNav()
- keyboardAction()
- preloadNeighborImages()
- end()

Function Calls
- document.observe()

*/
// -----------------------------------------------------------------------------------

//
//  Configurationl
//
LightboxOptions = Object.extend({
fileLoadingImage:        'ljg/img/lightbox/loading.gif',     
fileBottomNavCloseImage: 'ljg/img/lightbox/closelabel.gif',

overlayOpacity: 0.8,   // controls transparency of shadow overlay

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

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

// When grouping images this is used to write: Image # of #.
// Change it for non-english localization
labelImage: "Image",
labelOf: "of"
}, window.LightboxOptions || {});

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

var Lightbox = Class.create();

Lightbox.prototype = {
imageArray: [],
activeImage: undefined,

// initialize()
// Constructor runs on completion of the DOM loading. Calls updateImageList and then
// the function inserts html at the bottom of the page which is used to display the shadow 
// overlay and the image container.
//
initialize: function() {    

this.updateImageList();

this.keyboardAction = this.keyboardAction.bindAsEventListener(this);

if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
if (LightboxOptions.resizeSpeed < 1)  LightboxOptions.resizeSpeed = 1;
				  
				  this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
				  this.overlayDuration = LightboxOptions.animate ? 0.2 : 0;  // shadow fade in/out duration
				  
				  // 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.
				  var size = (LightboxOptions.animate ? 250 : 1) + 'px';
				  
				  
				  // 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 = $$('body')[0];
					
					objBody.appendChild(Builder.node('div',{id:'overlay'}));
					
					objBody.appendChild(Builder.node('div',{id:'lightbox'}, [
					Builder.node('div',{id:'outerImageContainer'}, 
					Builder.node('div',{id:'imageContainer'}, [
					Builder.node('img',{id:'lightboxImage'}), 
					Builder.node('div',{id:'hoverNav'}, [
					Builder.node('a',{id:'prevLink', href: '#' }),
					Builder.node('a',{id:'nextLink', href: '#' })
					]),
					Builder.node('div',{id:'loading'}, 
					Builder.node('a',{id:'loadingLink', href: '#' }, 
					Builder.node('img', {src: LightboxOptions.fileLoadingImage})
					)
					)
					])
					),
					Builder.node('div', {id:'imageDataContainer'},
					Builder.node('div',{id:'imageData'}, [
					Builder.node('div',{id:'imageDetails'}, [
					Builder.node('span',{id:'caption'}),
					Builder.node('span',{id:'numberDisplay'})
					]),
					Builder.node('div',{id:'bottomNav'},
					Builder.node('a',{id:'bottomNavClose', href: '#' },
					Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
					)
					)
					])
					)
					]));
					
					
					$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
					$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
					$('outerImageContainer').setStyle({ width: size, height: size });
					$('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
					$('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
					$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
					$('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
					
					var th = this;
					(function(){
					var ids = 
					'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' + 
					'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';   
					$w(ids).each(function(id){ th[id] = $(id); });
					}).defer();
					},
					
					//
					// updateImageList()
					// Loops through anchor tags looking for 'lightbox' references and applies onclick
					// events to appropriate links. You can rerun after dynamically adding images w/ajax.
					//
					updateImageList: function() {   
					this.updateImageList = Prototype.emptyFunction;
					
					document.observe('click', (function(event){
					var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
					if (target) {
					event.stop();
					this.start(target);
					}
					}).bind(this));
					},
					
					//
					//  start()
					//  Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
					//
					start: function(imageLink) {    
					
					$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
					
					// stretch overlay to fill page and fade in
					var arrayPageSize = this.getPageSize();
					$('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
					
					new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });
					
					this.imageArray = [];
					var imageNum = 0;       
					
					if ((imageLink.rel == 'lightbox')){
					// if image is NOT part of a set, add single image to imageArray
					this.imageArray.push([imageLink.href, imageLink.title]);         
					} else {
					// if image is part of a set..
					this.imageArray = 
					$$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
					collect(function(anchor){ return [anchor.href, anchor.title]; }).
					uniq();
					
					while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
					}
					
					// calculate top and left offset for the lightbox 
					var arrayPageScroll = document.viewport.getScrollOffsets();
					var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
					var lightboxLeft = arrayPageScroll[0];
					this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
					
					this.changeImage(imageNum);
					},
					
					//
					//  changeImage()
					//  Hide most elements and preload image in preparation for resizing image container.
					//
					changeImage: function(imageNum) {   
					
					this.activeImage = imageNum; // update global var
					
					// hide elements during transition
					if (LightboxOptions.animate) this.loading.show();
					this.lightboxImage.hide();
					this.hoverNav.hide();
					this.prevLink.hide();
					this.nextLink.hide();
					// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
					this.imageDataContainer.setStyle({opacity: .0001});
					this.numberDisplay.hide();      
					
					var imgPreloader = new Image();
					
					// once image is preloaded, resize image container
					
					
					imgPreloader.onload = (function(){
					this.lightboxImage.src = this.imageArray[this.activeImage][0];
					this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
					}).bind(this);
					imgPreloader.src = this.imageArray[this.activeImage][0];
					},
					
					//
					//  resizeImageContainer()
					//
					resizeImageContainer: function(imgWidth, imgHeight) {
					
					// get current width and height
					var widthCurrent  = this.outerImageContainer.getWidth();
					var heightCurrent = this.outerImageContainer.getHeight();
					
					// get new width and height
					var widthNew  = (imgWidth  + LightboxOptions.borderSize * 2);
					var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
					
					// scalars based on change from old to new
					var xScale = (widthNew  / widthCurrent)  * 100;
					var yScale = (heightNew / heightCurrent) * 100;
					
					// calculate size difference between new and old image, and resize if necessary
					var wDiff = widthCurrent - widthNew;
					var hDiff = heightCurrent - heightNew;
					
					if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'}); 
					if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration}); 
					
					// if new and old image are same size and no scaling transition is necessary, 
					// do a quick pause to prevent image flicker.
					var timeout = 0;
					if ((hDiff == 0) && (wDiff == 0)){
					timeout = 100;
					if (Prototype.Browser.IE) timeout = 250;   
					}
					
					(function(){
					this.prevLink.setStyle({ height: imgHeight + 'px' });
					this.nextLink.setStyle({ height: imgHeight + 'px' });
					this.imageDataContainer.setStyle({ width: widthNew + 'px' });
					
					this.showImage();
					}).bind(this).delay(timeout / 1000);
					},
					
					//
					//  showImage()
					//  Display image and begin preloading neighbors.
					//
					showImage: function(){
					this.loading.hide();
					new Effect.Appear(this.lightboxImage, { 
					duration: this.resizeDuration, 
					queue: 'end', 
					afterFinish: (function(){ this.updateDetails(); }).bind(this) 
					});
					this.preloadNeighborImages();
					},
					
					//
					//  updateDetails()
					//  Display caption, image number, and bottom nav.
					//
					updateDetails: function() {
					
					// if caption is not null
					if (this.imageArray[this.activeImage][1] != ""){
					this.caption.update(this.imageArray[this.activeImage][1]).show();
					}
					
					// if image is part of set display 'Image x of x' 
					if (this.imageArray.length > 1){
					this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + this.imageArray.length).show();
					}
					
					new Effect.Parallel(
					[ 
					new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }), 
					new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration }) 
					], 
					{ 
					duration: this.resizeDuration, 
					afterFinish: (function() {
					// update overlay size and update nav
					var arrayPageSize = this.getPageSize();
					this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
					this.updateNav();
					}).bind(this)
					} 
					);
					},
					
					//
					//  updateNav()
					//  Display appropriate previous and next hover navigation.
					//
					updateNav: function() {
					
					this.hoverNav.show();               
					
					// if not first image in set, display prev image button
					if (this.activeImage > 0) this.prevLink.show();
					
					// if not last image in set, display next image button
					if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();
							       
							       this.enableKeyboardNav();
							       },
							       
							       //
							       //  enableKeyboardNav()
							       //
							       enableKeyboardNav: function() {
							       document.observe('keydown', this.keyboardAction); 
							       },
							       
							       //
							       //  disableKeyboardNav()
							       //
							       disableKeyboardNav: function() {
							       document.stopObserving('keydown', this.keyboardAction); 
							       },
							       
							       //
							       //  keyboardAction()
							       //
							       keyboardAction: function(event) {
							       var keycode = event.keyCode;
							       
							       var escapeKey;
							       if (event.DOM_VK_ESCAPE) {  // mozilla
							       escapeKey = event.DOM_VK_ESCAPE;
							       } else { // ie
							       escapeKey = 27;
							       }
							       
							       var key = String.fromCharCode(keycode).toLowerCase();
							       
							       if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
							       this.end();
							       } else if ((key == 'p') || (keycode == 37)){ // display previous image
							       if (this.activeImage != 0){
							       this.disableKeyboardNav();
							       this.changeImage(this.activeImage - 1);
							       }
							       } else if ((key == 'n') || (keycode == 39)){ // display next image
							       if (this.activeImage != (this.imageArray.length - 1)){
							       this.disableKeyboardNav();
							       this.changeImage(this.activeImage + 1);
							       }
							       }
							       },
							       
							       //
							       //  preloadNeighborImages()
							       //  Preload previous and next images.
							       //
							       preloadNeighborImages: function(){
							       var preloadNextImage, preloadPrevImage;
							       if (this.imageArray.length > this.activeImage + 1){
						preloadNextImage = new Image();
						preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
						}
						if (this.activeImage > 0){
						preloadPrevImage = new Image();
						preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
						}
						
						},
						
						//
						//  end()
						//
						end: function() {
						this.disableKeyboardNav();
						this.lightbox.hide();
						new Effect.Fade(this.overlay, { duration: this.overlayDuration });
						$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
						},
						
						//
						//  getPageSize()
						//
						getPageSize: function() {
						
						var xScroll, yScroll;
						
						if (window.innerHeight && window.scrollMaxY) {	
						xScroll = window.innerWidth + window.scrollMaxX;
						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
						if(document.documentElement.clientWidth){
						windowWidth = document.documentElement.clientWidth; 
						} else {
						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 = xScroll;		
									  } else {
									  pageWidth = windowWidth;
									  }
									  
									  return [pageWidth,pageHeight];
									  }
									  }
									  
document.observe('dom:loaded', function () { new Lightbox(); });