//Lightbox v2.04 by Lokesh Dhakar - http://www.lokeshdhakar.com

LightboxOptions = Object.extend(
{
	fileLoadingImage: 'sitedata/script/lightfoto/01.gif',
	fileBottomNavCloseImage: 'sitedata/script/lightfoto/02.gif',
	overlayOpacity: 0.8,
	animate: true,
	resizeSpeed: 7,
	borderSize: 10,
	labelImage: "Image",
	labelOf: "of"
},
window.LightboxOptions || {});

var Lightbox = Class.create();

Lightbox.prototype =
{
	imageArray: [],
	activeImage: undefined,

	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;
		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: 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: function(imageLink)
	{
		$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
		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'))
		{
			this.imageArray.push([imageLink.href, imageLink.title]);
		}
		else
		{
			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++;}
		}
		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: function(imageNum)
	{
		this.activeImage = imageNum;
		if(LightboxOptions.animate) this.loading.show();
		this.lightboxImage.hide();
		this.hoverNav.hide();
		this.prevLink.hide();
		this.nextLink.hide();
		this.imageDataContainer.setStyle({opacity: .0001});
		this.numberDisplay.hide();
		var imgPreloader = new Image();
		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)
	{
		var widthCurrent  = this.outerImageContainer.getWidth();
		var heightCurrent = this.outerImageContainer.getHeight();
		var widthNew  = (imgWidth  + LightboxOptions.borderSize * 2);
		var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
		var xScale = (widthNew  / widthCurrent)  * 100;
		var yScale = (heightNew / heightCurrent) * 100;
		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});
		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(this.imageArray[this.activeImage][1] != "")
		{
			this.caption.update(this.imageArray[this.activeImage][1]).show();
		}
		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()
			{
				var arrayPageSize = this.getPageSize();
				this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
				this.updateNav();
			}
			).bind(this)
		}
		);
	},

	updateNav: function()
	{
		this.hoverNav.show();               
		if(this.activeImage > 0) this.prevLink.show();
		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)
		{
			escapeKey = event.DOM_VK_ESCAPE;
		}
		else
		{
			escapeKey = 27;
		}
		var key = String.fromCharCode(keycode).toLowerCase();
		if(key.match(/x|o|c/) || (keycode == escapeKey))
		{
			this.end();
		}
		else if((key == 'p') || (keycode == 37))
		{
			if(this.activeImage != 0)
			{
				this.disableKeyboardNav();
				this.changeImage(this.activeImage - 1);
			}
		}
		else if((key == 'n') || (keycode == 39))
		{
			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' });
	},
	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)
		{
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		}
		else
		{
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		var windowWidth, windowHeight;
		if(self.innerHeight)
		{
			if(document.documentElement.clientWidth)
			{
				windowWidth = document.documentElement.clientWidth;
			}
			else
			{
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		}
		else if(document.documentElement && document.documentElement.clientHeight)
		{
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		}
		else if(document.body)
		{
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}
		if(yScroll < windowHeight)
		{
			pageHeight = windowHeight;
		}
		else
		{
			pageHeight = yScroll;
		}
		if(xScroll < windowWidth)
		{
			pageWidth = xScroll;
		}
		else
		{
			pageWidth = windowWidth;
		}
		return [pageWidth,pageHeight];
	}
}
document.observe('dom:loaded', function () { new Lightbox(); });