// -----------------------------------------------------------------------------------
//
//	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()
   
*/
// -----------------------------------------------------------------------------------

//
//	Configuration
//
LightboxOptions = Object.extend({
	fileLoadingImage:        'images/loading.gif',
	fileBottomNavCloseImage: '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';
		
		var objBody = $$('body')[0];
		
		var overlay = new Element('div', { id: 'overlay' });
		objBody.insert(overlay);
		
		var lightbox            = new Element('div', { id: 'lightbox' });
		var outerImageContainer = new Element('div', { id: 'outerImageContainer' });
		var imageContainer      = new Element('div', { id: 'imageContainer' });
		var lightboxContainer   = new Element('div', { id: 'lightboxContainer' });
		var lightboxImage       = new Element('img', { id: 'lightboxImage', src: LightboxOptions.itemLineDrawingOverlay });
		var hoverNav            = new Element('div', { id: 'hoverNav' });
		var prevLink            = new Element('a', { id: 'prevLink', href: 'javascript:void(0);' });
		var nextLink            = new Element('a', { id: 'nextLink', href: 'javascript:void(0);' });
		var loading             = new Element('div', { id: 'loading' });
		var loadingLink         = new Element('a', { id: 'loadingLink', href: 'javascript:void(0);' });
		var loadingImage        = new Element('img', { src: LightboxOptions.fileLoadingImage });
		var imageDataContainer  = new Element('div', { id: 'imageDataContainer' });
		var imageData           = new Element('div', { id: 'imageData' });
		var imageDetails        = new Element('div', { id: 'imageDetails' });
		var caption             = new Element('span', { id: 'caption' });
		var numberDisplay       = new Element('span', { id: 'numberDisplay' });
		var imageInformation    = new Element('span', { id: 'imageInformation' });
		var bottomNav           = new Element('div', { id: 'bottomNav' });
		var downloadSwatch      = new Element('a', { id: 'downloadSwatch', href: 'javascript:void(0);' }).insert('Download swatch');
		var bottomNavClose      = new Element('a', { id: 'bottomNavClose', href: 'javascript:void(0);' }).insert(new Element('img', { src: LightboxOptions.fileBottomNavCloseImage }));
		
		outerImageContainer.insert(
			imageContainer.insert(
				lightboxContainer.insert(
					lightboxImage
				)
			).insert(
				hoverNav.insert(
					prevLink
				).insert(
					nextLink
				)
			).insert(
				loading.insert(
					loadingLink.insert(loadingImage)
				)
			)
		);
		
		imageDataContainer.insert(
			imageData.insert(
				imageDetails.insert(
					caption
				).insert(
					numberDisplay
				).insert(
					imageInformation
				)
			).insert(
				bottomNav.insert(
					downloadSwatch
				).insert(
					bottomNavClose
				)
			)
		);
		
		lightbox.insert(outerImageContainer).insert(imageDataContainer);
		objBody.insert(lightbox);
		
		lightbox.hide().observe('click', function(event) {
			if (event.element().readAttribute('id') == 'lightbox') {
				this.end();
			}
		}.bind(this));
		
		outerImageContainer.setStyle({
			width:  size,
			height: size
		});
		
		prevLink.observe('click', function() {
			this.changeImage(this.activeImage - 1);
		}.bind(this));
		nextLink.observe('click', function() {
			this.changeImage(this.activeImage + 1);
		}.bind(this));
		
		overlay.hide().observe('click', this.end.bindAsEventListener(this));
		loadingLink.observe('click', this.end.bindAsEventListener(this));
		bottomNavClose.observe('click', this.end.bindAsEventListener(this));
		
		downloadSwatch.observe('click', this.download.bind(this));
		
		var th = this;
		(function(){
			var ids = 
				'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' + 
				'lightboxContainer imageDataContainer imageData imageDetails caption numberDisplay imageInformation bottomNav downloadSwatch 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.hidden = true;
				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();
		this.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..
			var anchorTags = $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]');
			
			this.imageArray = anchorTags.collect(function(anchor) {
				return [anchor.getStyle('backgroundColor'), anchor.readAttribute('title'), anchor.up().down('dl'), anchor.readAttribute('href')];
			}).uniq();
			
			while (this.imageArray[imageNum][0] != imageLink.getStyle('backgroundColor')) { 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.lightboxContainer.hide();
		this.hoverNav.hide();
		this.prevLink.hide();
		this.nextLink.hide();
		
		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
		if (this.hidden) {
			this.imageDataContainer.setStyle({ opacity: .0001 });
			this.numberDisplay.hide();
		}
		
		var imgPreloader = new Image();
		
		// once image is preloaded, resize image container
		imgPreloader.onload = (function() {
			this.resizeImageContainer(LightboxOptions.overlayWidth, LightboxOptions.overlayHeight);
			this.lightboxContainer.writeAttribute('style', 'background-image: url(' + this.imageArray[this.activeImage][3] + ')');
			this.lightboxContainer.setStyle({ backgroundImage: this.imageArray[this.activeImage][3] });
			this.lightboxContainer.hide();
		}).bind(this);
		
		if (!this.imageArray[this.activeImage][3].match(/^javascript/)) {
			imgPreloader.src = this.imageArray[this.activeImage][3];
		} else {
			this.lightboxContainer.setStyle({ backgroundImage: 'none' });
			this.lightboxContainer.setStyle({ backgroundColor: this.imageArray[this.activeImage][0] });
			this.resizeImageContainer(LightboxOptions.overlayWidth, LightboxOptions.overlayHeight);
		}
		
		this.lightboxContainer.hide();
	},

	//
	//	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' });
			if (Prototype.Browser.IE) {
				this.imageContainer.setStyle({ height: heightNew + 'px' });
				this.lightboxContainer.setStyle({ height: heightNew - 20 + 'px' });
				this.lightboxImage.setStyle({ width: imgWidth + 'px', height: imgHeight + 'px', verticalAlign: 'top' });
			}
			this.showImage();
		}).bind(this).delay(timeout / 1000);
	},
	
	//
	//	showImage()
	//	Display image and begin preloading neighbors.
	//
	showImage: function() {
		this.loading.hide();
		new Effect.Appear(this.lightboxContainer, { 
			duration: this.resizeDuration, 
			queue: 'end', 
			afterFinish: 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();
		}
		
		// If we have some image information, display it
		if (this.imageArray[this.activeImage][2]) {
			var imageInformation = this.imageArray[this.activeImage][2].clone(true);
			imageInformation.show();
			this.imageInformation.update(imageInformation);
		}
		
		if (this.hidden) {
			this.hidden = false;
			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)
				} 
			);
		} else {
			this.updateNav();
		}
	},

	//
	//	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];
	},
	
	download: function()
	{
		// Get the title of the image
		var imageTitle = this.imageArray[this.activeImage][1];
		// Style 64000: Military Green 106
		var matches = imageTitle.match(/^Style\s([0-9A-Z]+):\s([^0-9]+)/);
		var style  = matches[1].strip();
		var colour = matches[2].strip();
		
		colour = colour.replace(/\s+/g, '-').toLowerCase();
		
		window.open(baseUrl + 'popups/download-swatch/' + style + '-' + colour + '.gif', 'spSwatch');
	}
}

document.observe('dom:loaded', function () { new Lightbox(); });