// -----------------------------------------------------------------------------------
//
//	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:        '/public/frontend/js/lightbox2.04/images/loading.gif',     
	 fileBottomNavCloseImage: '/public/frontend/js/lightbox2.04/images/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(); });