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

if (typeof pgePath=="undefined") var pgePath = '';

LightboxOptions = Object.extend({
		fileLoadingImage:		pgePath+'/img/lbLoading.gif',
		fileBottomNavCloseImage: pgePath+'/img/lbClose2.png',

		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: "Fotografie",
	labelOf: "z"
}, 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

		var size = (LightboxOptions.animate ? 250 : 1) + 'px';
		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(); });