// -----------------------------------------------------------------------------------
//
//	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:        '/graphics/lightbox/loading.gif',     
		fileBottomNavCloseImage: '/graphics/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="/graphics/lightbox/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="/graphics/lightbox/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(); });