// -----------------------------------------------------------------------------------
//
//	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: 'pliki/lightbox/images/loading.gif',
	fileBottomNavCloseImage: 'pliki/lightbox/images/x.gif',
	
	overlayOpacity: 0.6, // controls transparency of shadow overlay
	animate: true, // toggles resizing animations
	resizeSpeed: 10, // 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: "Zdjêcie",
	labelOf: "z"
}, window.LightboxOptions || {});

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

var Lightbox = Class.create();

Lightbox.prototype = {
	imageArray: [],
	activeImage: undefined,
	
	minWidth: 250,
	
	// 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('a', {
		 id: 'prevLink2',
		 href: '#'
		 }),
		 */
		Builder.node('span', {
			id: 'numberDisplay'
		}),  /*
		 Builder.node('a', {
		 id: 'nextLink2',
		 href: '#'
		 }),
		 */
		Builder.node('a', {
			id: 'bottomNavClose',
			href: '#'
		})]), ]))]));
		
		$('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));
		
		// $('prevLink2').innerHTML = "Poprzednie";
		// $('nextLink2').innerHTML = "Nastêpne";
		
		/*
		 $('prevLink2').observe('click', (function(event) {
		 event.stop();
		 this.changeImage(this.activeImage - 1);
		 }).bindAsEventListener(this));
		 $('nextLink2').observe('click', (function(event) {
		 event.stop();
		 this.changeImage(this.activeImage + 1);
		 }).bindAsEventListener(this));
		 */
		$('bottomNavClose').innerHTML = "Zamknij";
		
		$('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 prevLink2 nextLink2 bottomNav bottomNavClose';
			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) {
	
		$('overlay').hide().observe('click', (function() {
			this.end();
		}).bind(this));
		
		$$('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.name]);
			
		} else {
			// if image is part of a set..
			this.imageArray = $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').collect(function(anchor) {
				return [anchor.href, anchor.name];
			}).uniq();
			this.imageArray = this.imageArray.unique2();
			while (this.imageArray[imageNum][0] != imageLink.href) {
				imageNum++;
			}
		}
		
		// calculate top and left offset for the lightbox
		var arrayPageScroll = document.viewport.getScrollOffsets();
		var lightboxTop = 0;
		
		if (document.viewport.getHeight() > 600) {
			lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
		} else {
			lightboxTop = arrayPageScroll[1] + 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();
		//this.prevLink2.hide();
		//this.nextLink2.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);
		
		if (widthNew < this.minWidth) widthNew = this.minWidth;
		
		// 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.prevLink2.setStyle({
			 height: '20px'
			 }, {
			 width: '30px'
			 });
			 this.nextLink2.setStyle({
			 height: '20px'
			 }, {
			 width: '30px'
			 });
			 */
			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();
			//this.prevLink2.show();
		}
		
		// if not last image in set, display next image button
		if (this.activeImage < (this.imageArray.length - 1)) {
			this.nextLink.show();
			//this.nextLink2.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();
});