// -----------------------------------------------------------------------------------
//
//	Lightbox v2.03.3
//	by Lokesh Dhakar - http://www.huddletogether.com
//	5/21/06
//
//	For more information on this script, visit:
//	http://huddletogether.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//	
//	Credit also due to those who have helped, inspired, and made their code available to the public.
//	Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), Thomas Fuchs(mir.aculo.us), and others.
//
//
// -----------------------------------------------------------------------------------

//
//	Configuration
//
var fileLoadingImage = "/images/loading.gif";		
var fileBottomNavCloseImage = "/images/close.gif";

var overlayOpacity = 0.8;	// controls transparency of shadow overlay

var animate = true;			// toggles resizing animations

var resizeSpeed = 7;		// controls the speed of the image resizing animations (1=slowest and 10=fastest)

var borderSize = 10;		//if you adjust the padding in the CSS, you will need to update this variable
var startSize;
// -----------------------------------------------------------------------------------

//
//	Global Variables
//
var activeImage;

if(animate == true){
	overlayDuration = 0.2;	// shadow fade in/out duration
	if(resizeSpeed > 10){ resizeSpeed = 10;}
	if(resizeSpeed < 1){ resizeSpeed = 1;}
	resizeDuration = (11 - resizeSpeed) * 0.15;
        startSize = 250;
} else { 
	overlayDuration = 0;
	resizeDuration = 0;
        startSize = 1;
}

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


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

//
//	Lightbox Class Declaration
//	- initialize()
//	- start()
//	- changeImage()
//	- resizeImageContainer()
//	- showImage()
//	- updateDetails()
//	- updateNav()
//	- enableKeyboardNav()
//	- disableKeyboardNav()
//	- keyboardNavAction()
//	- preloadNeighborImages()
//	- end()
//
//	Structuring of code inspired by Scott Upton (http://www.uptonic.com/)
//
var Lightbox = Class.create();

Lightbox.prototype = {
	
	// 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();

		// 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 = document.getElementsByTagName("body").item(0);
                var clsH = function(e) { this.end(); e.stop(); }.bindAsEventListener(this);
                
		objBody.appendChild(new Element("div", { id: 'overlay', style: 'display: none'})
                  .observe('click', clsH));
		
		var objLightbox = new Element("div", { id: 'lightbox', style: 'display: none'}).observe('click', clsH);
		objBody.appendChild(objLightbox);
			
		var objOuterImageContainer = new Element('div', 
                   { id: 'outerImageContainer', width: startSize + "px", height: startSize + "px" });
		objLightbox.appendChild(objOuterImageContainer);

		var objImageContainer = new Element('div', {id: 'imageContainer'});
		objOuterImageContainer.appendChild(objImageContainer);
	
		objImageContainer.appendChild(new Element('img', {id: 'lightboxImage'}));
	
		var objHoverNav = new Element('div', { id: 'hoverNav' });
		objImageContainer.appendChild(objHoverNav);
	
		objHoverNav.appendChild(new Element("a", {id: 'prevLink', href: '#'}));
		objHoverNav.appendChild(new Element("a", {id: 'nextLink', href: '#'}));
	
		var objLoading = new Element("div", {id: 'loading'});
		objImageContainer.appendChild(objLoading);
	
		var objLoadingLink = new Element("a", {id:'loadingLink', href: '#'});
		$(objLoadingLink).observe('click', clsH);

		objLoading.appendChild(objLoadingLink);
	
		var objLoadingImage = new Element("img", {src: fileLoadingImage});
		objLoadingLink.appendChild(objLoadingImage);

		var objImageDataContainer = new Element("div", {id: 'imageDataContainer'});
		objLightbox.appendChild(objImageDataContainer);

		var objImageData = new Element("div", {id: 'imageData'});
		objImageDataContainer.appendChild(objImageData);
	
		var objImageDetails = new Element("div", {id:'imageDetails'});
		objImageData.appendChild(objImageDetails);
	
		objImageDetails.appendChild(new Element("span", {id: 'caption'}));
	
		objImageDetails.appendChild(new Element("span", {id:'numberDisplay'}));
		
		var objBottomNav = new Element("div", {id: 'bottomNav'});
		objImageData.appendChild(objBottomNav);
	
		var objBottomNavCloseLink = new Element("a", {id: 'bottomNavClose', href: '#'});
		$(objBottomNavCloseLink).observe('click', clsH);
		objBottomNav.appendChild(objBottomNavCloseLink);
		objBottomNavCloseLink.appendChild(new Element("img", {src: fileBottomNavCloseImage}));
	},


	//
	// 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.images = new Array;
            $$('a.enlarge').each(function(element) {
               element.observe('click', function(e) { this.start(element); e.stop();}.bind(this));
               this.images.push([element.getAttribute('rel'), element.getAttribute('title')]);
            }.bind(this));
	},
	
	
	//
	//	start()
	//	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
	//
	start: function(imageLink) {	

                $$('select').invoke('hide');
		$$('object').invoke('hide');
                $$('embed').invoke('hide');

		// stretch overlay to fill page and fade in
		var arrayPageSize = getPageSize();
                $('overlay').setStyle({width:  arrayPageSize[0] + "px", height: arrayPageSize[1] + "px"});
		new Effect.Appear('overlay', { duration: overlayDuration, from: 0.0, to: overlayOpacity });

		imageNum = 0;		
                while(this.images[imageNum][0] != imageLink.getAttribute('rel')) { imageNum++;}

		// calculate top and left offset for the lightbox 
		var arrayPageScroll = getPageScroll();
		var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
		var lightboxLeft = arrayPageScroll[0];
                $('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) {	
		
		activeImage = imageNum;	// update global var

		// hide elements during transition
		if(animate){ Element.show('loading');}
		[$('lightboxImage'), $('hoverNav'), $('prevLink'), $('nextLink'), $('imageDataContainer'), 
		 $('numberDisplay')].invoke('hide');
		
		imgPreloader = new Image();
		
		// once image is preloaded, resize image container
		imgPreloader.onload=function(){
			$('lightboxImage').src = this.images[activeImage][0];
			this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
			imgPreloader.onload=function(){};	//	clear onLoad, IE behaves irratically with animated gifs otherwise 
		}.bind(this);
		imgPreloader.src = this.images[activeImage][0];
	},

	//
	//	resizeImageContainer()
	//
	resizeImageContainer: function(imgWidth, imgHeight) {

		// get curren width and height
		this.widthCurrent = $('outerImageContainer').offsetWidth;
		this.heightCurrent = $('outerImageContainer').offsetWidth;

		// get new width and height
		var widthNew = (imgWidth  + (borderSize * 2));
		var heightNew = (imgHeight  + (borderSize * 2));

		// scalars based on change from old to new
		this.xScale = ( widthNew / this.widthCurrent) * 100;
		this.yScale = ( heightNew / this.heightCurrent) * 100;

		// calculate size difference between new and old image, and resize if necessary
		wDiff = this.widthCurrent - widthNew;
		hDiff = this.heightCurrent - heightNew;

		if(!(hDiff == 0)) { 
                    new Effect.Scale('outerImageContainer', this.yScale, {
                       scaleX: false, 
                       duration: resizeDuration, 
                       queue: 'front',
                       afterFinish: function() {
                          $('outerImageContainer').setStyle({height: heightNew + "px"});
                       }

                    }); 
                }
		if (!(wDiff == 0)) { 
                  new Effect.Scale('outerImageContainer', this.xScale, { 
                       scaleY: false, 
                       delay: resizeDuration, 
                       duration: resizeDuration, 
                       afterFinish: function() {  
                          $('outerImageContainer').setStyle({width: widthNew + "px"});
                       }
                  }); 
                }
		// if new and old image are same size and no scaling transition is necessary, 
		// do a quick pause to prevent image flicker.
		if((hDiff == 0) && (wDiff == 0)){
			if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } else { pause(100);} 
		}
                $('prevLink').setStyle({height: imgHeight + "px"});
                $('nextLink').setStyle({height: imgHeight + "px"});
                $('hoverNav').setStyle({height: imgHeight + "px"});
                $('imageDataContainer').setStyle({width: widthNew + "px"});
		this.showImage();
	},
	
	//
	//	showImage()
	//	Display image and begin preloading neighbors.
	//
	showImage: function(){
		$('loading').hide();
		new Effect.Appear('lightboxImage', { 
                   duration: 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.images[activeImage][1]){
			$('caption').show().update(this.images[activeImage][1]);
		}
		
		// if image is part of set display 'Image x of x' 
		if (this.images.length > 1) {
                  $('numberDisplay').show().update("Ilustracja " + eval(activeImage + 1) + " z " + this.images.length);
		}

		new Effect.Parallel(
			[ new Effect.SlideDown( 'imageDataContainer', { sync: true, duration: resizeDuration, from: 0.0, to: 1.0 }), 
			  new Effect.Appear('imageDataContainer', { sync: true, duration: resizeDuration }) ], 
			{ duration: resizeDuration, afterFinish: function() {
				// update overlay size and update nav
				var arrayPageSize = getPageSize();
                                $('overlay').setStyle({height: arrayPageSize[1]});
				this.updateNav();
				}.bind(this)
			} 
		);
	},

	//
	//	updateNav()
	//	Display appropriate previous and next hover navigation.
	//
	updateNav: function() {

		$('hoverNav').show();

		// if not first image in set, display prev image button
		if (activeImage != 0){
                  $('prevLink').show().stopObserving().observe('click', function(e) {
                    this.changeImage(activeImage - 1); e.stop(); 
                  }.bindAsEventListener(this));
		}

		// if not last image in set, display next image button
		if (activeImage != (this.images.length - 1)){
                  $('nextLink').show().stopObserving().observe('click', function(e) {
                     this.changeImage(activeImage + 1); e.stop();
                  }.bindAsEventListener(this));
		}
		
		this.enableKeyboardNav();
	},

	//
	//	enableKeyboardNav()
	//
	enableKeyboardNav: function() {
           $(document).observe('keydown', this.keyboardAction.bindAsEventListener(this));
	},

	//
	//	disableKeyboardNav()
	//
	disableKeyboardNav: function() {
           $(document).stopObserving('keydown');
	},

	//
	//	keyboardAction()
	//
	keyboardAction: function(e) {
		var key = String.fromCharCode(e.keyCode).toLowerCase();
		
		if ((key == 'x') || (key == 'o') || (key == 'c') || (e.keyCode == Event.KEY_ESC)){  // close lightbox
                  this.end();
		} else if ((key == 'p') || (e.keyCode == 37)) {  // display previous image
			if(activeImage != 0){
				this.disableKeyboardNav();
				this.changeImage(activeImage - 1);
			}
		} else if((key == 'n') || (e.keyCode == 39)){	// display next image
			if(activeImage != (this.images.length - 1)){
				this.disableKeyboardNav();
				this.changeImage(activeImage + 1);
			}
		}

	},

	//
	//	preloadNeighborImages()
	//	Preload previous and next images.
	//
	preloadNeighborImages: function(){

		if((this.images.length - 1) > activeImage){
			preloadNextImage = new Image();
			preloadNextImage.src = this.images[activeImage + 1][0];
		}
		if(activeImage > 0){
			preloadPrevImage = new Image();
			preloadPrevImage.src = this.images[activeImage - 1][0];
		}
	
	},

	//
	//	end()
	//
	end: function() {
		this.disableKeyboardNav();
		$('lightbox').hide();
		new Effect.Fade('overlay', { duration: overlayDuration});
                $$('select').invoke('show');
                $$('object').invoke('show');
                $$('embed').invoke('show');
	}
}

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

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.com
//
function getPageScroll(){

	var xScroll, yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
		xScroll = self.pageXOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
		xScroll = document.documentElement.scrollLeft;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
		xScroll = document.body.scrollLeft;	
	}

	arrayPageScroll = new Array(xScroll,yScroll) 
	return arrayPageScroll;
}

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

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.com
// Edit for Firefox by pHaez
//
function getPageSize(){
	
	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;
	
//	console.log(self.innerWidth);
//	console.log(document.documentElement.clientWidth);

	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;
	}

//	console.log("xScroll " + xScroll)
//	console.log("windowWidth " + windowWidth)

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
//	console.log("pageWidth " + pageWidth)

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

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

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Help from Ran Bar-On [ran2103@gmail.com]
//

function pause(ms){
	var date = new Date();
	curDate = null;
	do{var curDate = new Date();}
	while( curDate - date < ms);
}

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