// -----------------------------------------------------------------------------------
//
//	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.
//
// -----------------------------------------------------------------------------------
// -----------------------------------------------------------------------------------

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

	overlayOpacity: 0.90,   // controls transparency of shadow overlay

	animate: true,		 // toggles resizing animations
	resizeSpeed: 9,		// 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,
	filmstrip: undefined,
	overlayHideEventHandler: undefined,
	lightboxHideEventHandler: undefined,
	
	initialize: function(filmstrip) {	
		this.filmstrip = filmstrip;
		
		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 })
						)
					)
				])
			)
		]));

		this.overlayHideEventHandler = this.end.bind(this);
		this.lightboxHideEventHandler = (function(event) { 
			if (event.element().id == 'lightbox') this.end(); }).bind(this);			
		$('overlay').hide().observe('click', this.overlayHideEventHandler);
		$('lightbox').hide().observe('click', this.lightboxHideEventHandler);
		//$('overlay').hide();
		//$('lightbox').hide();
		$('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 - 0 + 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();

		// moved init'ing of imageArray to ctor, because it's tied to filmstrip now
		this.imageArray = [];
		for (i=0; i<this.filmstrip.images.length; i++) {
			if (filmstrip.imageInfo[i] != null) {
				this.imageArray.push([this.filmstrip.imageLinks[i],this.filmstrip.imageInfo[i]]);				
			}
		}
	},

	start: function(imageNum) {	
		$$('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 });

		// calculate top and left offset for the lightbox 
		var arrayPageScroll = document.viewport.getScrollOffsets();
//		var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
		var lightboxTop = arrayPageScroll[1] + 50;
		var lightboxLeft = arrayPageScroll[0];
		this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
		
		this.changeImage(imageNum);
	},

	changeImage: function(imageNum) {   
		this.activeImage = imageNum; // update global var

		window.location.hash = this.activeImage;
		this.filmstrip.scrollToImage(this.activeImage);

		// 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: 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: function(){
		this.loading.hide();
		new Effect.Appear(this.lightboxImage, { 
			duration: this.resizeDuration, 
			queue: 'end', 
			afterFinish: (function(){ this.updateDetails(); }).bind(this) 
		});
		this.preloadNeighborImages();
	},

	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: 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: function() {
		document.observe('keydown', this.keyboardAction); 
	},

	disableKeyboardNav: function() {
		document.stopObserving('keydown', this.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: 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: function() {
		this.disableKeyboardNav();
		this.lightbox.hide();
		new Effect.Fade(this.overlay, { duration: this.overlayDuration });
		$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
		window.location.hash = '#';
	},

	getPageSize: function() {
		var dim = document.viewport.getDimensions();
		return [dim.width,dim.height-60]; // subtracting vertical offset for overlay
	}
}