// -----------------------------------------------------------------------------------
//
//	Lightbox v2.02 (with balupton mods)
//	by Lokesh Dhakar - http://www.huddletogether.com
//	3/31/06
//
//	For more information on this script, visit:
//	http://huddletogether.com/projects/lightbox2/
//

var resizeSpeed = 7;	// controls the speed of the image resizing (1=slowest and 10=fastest)
var paddingSize = 1;
var minWidth = 230;
var minHeight = 75;

var overlayOpacity = 0.8;

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

//
//	Global Variables
//
var imageArray = new Array;
var activeImage;

if(resizeSpeed > 10){ resizeSpeed = 10;}
if(resizeSpeed < 1){ resizeSpeed = 1;}
resizeDuration = (11 - resizeSpeed) * 0.15;

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

//
//	Additional methods for Element added by SU, Couloir
//	- further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
	getWidth: function(element) {
	   	element = $(element);
	   	return element.offsetWidth; 
	},
	setWidth: function(element,w) {
	   	element = $(element);
    	element.style.width = w +"px";
	},
	setHeight: function(element,h) {
   		element = $(element);
    	element.style.height = h +"px";
	},
	setTop: function(element,t) {
	   	element = $(element);
    	element.style.top = t +"px";
	},
	setSrc: function(element,src) {
    	element = $(element);
    	element.src = src; 
	},
	getSrc: function(element) {
    	element = $(element);
    	return element.src;
	},
	setInnerHTML: function(element,content) {
		element = $(element);
		element.innerHTML = content;
	}
});

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

//
//	Extending built-in Array object
//	- array.removeDuplicates()
//	- array.empty()
//
Array.prototype.removeDuplicates = function () {
	for(i = 1; i < this.length; i++){
		if(this[i][0] == this[i-1][0]){
			this.splice(i,1);
		}
	}
}

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

Array.prototype.empty = function () {
	for(i = 0; i <= this.length; i++){
		this.shift();
	}
}

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

var Lightbox = Class.create();

Lightbox.prototype = {
	
	// initialize()
	// Constructor runs on completion of the DOM loading. Loops through anchor tags looking for 
	// 'lightbox' references and applies onclick events to appropriate links. The 2nd section of
	// the function inserts html at the bottom of the page which is used to display the shadow 
	// overlay and the image container.
	//
	initialize: function() {	
		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		// loop through all anchor tags
		for (var i=0; i<anchors.length; i++){
			var anchor = anchors[i];
			
			var relAttribute = String(anchor.getAttribute('rel'));
			
			// use the string.match() method to catch 'lightbox' references in the rel attribute
			if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
				anchor.onclick = function () {myLightbox.start(this); return false;}
			}
		}

		// The rest of this 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="largeLink"></a>
		//					<a href="#" id="saveLink"></a>
		//					<a href="#" id="nextLink"></a>
		//				</div>
		//				<div id="loading">
		
		//				<!-- balupton change
		//					<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">
		
		//				<!-- balupton change
		//					<a href="#" id="bottomNavClose">
		//						<img src="images/close.gif">
		//					</a>
		//				-->
		
		//				</div>
		//			</div>
		//		</div>
		//	</div>


		var objBody = document.getElementsByTagName("body").item(0);
		
		var objOverlay = document.createElement("div");
		objOverlay.setAttribute('id','overlay');
		objOverlay.style.display = 'none';
		objOverlay.onclick = function() { myLightbox.end(); return false; }
		objBody.appendChild(objOverlay);
		
		var objPreloader = document.createElement("div");
		objPreloader.setAttribute('id','preloader');
		objBody.appendChild(objPreloader);
		
		var objLightbox = document.createElement("div");
		objLightbox.setAttribute('id','lightbox');
		objLightbox.style.display = 'none';
		objBody.appendChild(objLightbox);
	
		var objOuterImageContainer = document.createElement("div");
		objOuterImageContainer.setAttribute('id','outerImageContainer');
		objLightbox.appendChild(objOuterImageContainer);

		var objImageContainer = document.createElement("div");
		objImageContainer.setAttribute('id','imageContainer');
		objImageContainer.setAttribute('title','mouse over me to show the image`s information');
		objOuterImageContainer.appendChild(objImageContainer);
	
		var objLightboxImage = document.createElement("img");
		objLightboxImage.setAttribute('id','lightboxImage');
		objImageContainer.appendChild(objLightboxImage);
	
		var objHoverNav = document.createElement("div");
		objHoverNav.setAttribute('id','hoverNav');
		objImageContainer.appendChild(objHoverNav);
	
		var objPrevLink = document.createElement("a");
		objPrevLink.setAttribute('id','prevLink');
		objPrevLink.setAttribute('href','#');
		objHoverNav.appendChild(objPrevLink);
		
		var objNextLink = document.createElement("a");
		objNextLink.setAttribute('id','nextLink');
		objNextLink.setAttribute('href','#');
		objHoverNav.appendChild(objNextLink);
		
		var objLargeLink = document.createElement("a");
		objLargeLink.setAttribute('id','largeLink');
		objLargeLink.setAttribute('href','#');
		objHoverNav.appendChild(objLargeLink);
		
		var objSaveLink = document.createElement("a");
		objSaveLink.setAttribute('id','saveLink');
		objSaveLink.setAttribute('href','#');
		objHoverNav.appendChild(objSaveLink);
	
		var objLoading = document.createElement("div");
		objLoading.setAttribute('id','loading');
		objLoading.onclick = function() { myLightbox.end(); return false; } // balupton change
		objImageContainer.appendChild(objLoading);
		
		var objImageDataContainer = document.createElement("div");
		objImageDataContainer.setAttribute('id','imageDataContainer');
		objImageDataContainer.className = 'clearfix';
		objLightbox.appendChild(objImageDataContainer);

		var objImageData = document.createElement("div");
		objImageData.setAttribute('id','imageData');
		objImageDataContainer.appendChild(objImageData);
	
		var objImageDetails = document.createElement("div");
		objImageDetails.setAttribute('id','imageDetails');
		objImageData.appendChild(objImageDetails);
	
		var objCaption = document.createElement("span");
		objCaption.setAttribute('id','caption');
		objImageDetails.appendChild(objCaption);
	
		var objNumberDisplay = document.createElement("span");
		objNumberDisplay.setAttribute('id','numberDisplay');
		objImageDetails.appendChild(objNumberDisplay);
		
		var objBottomNav = document.createElement("div");
		objBottomNav.setAttribute('id','bottomNav');
		objBottomNav.onclick = function() { myLightbox.end(); return false; } // balupton change
		objImageData.appendChild(objBottomNav);
		
		
		$('largeLink').onclick = function() {
			myLightbox.setImage(Element.getSrc('lightboxImage').replace('/medium/','/large/'));
			return false;
		}
		$('saveLink').onclick = function() {
			document.location = gallery_url+'image.php?loc='+encodeURIComponent(Element.getSrc('lightboxImage'));
			return false;
		}
		$('prevLink').onclick = function() {
			myLightbox.changeImage(activeImage - 1);
			return false;
		}
		$('nextLink').onclick = function() {
			myLightbox.changeImage(activeImage + 1);
			return false;
		}
		
		preload_largeLink = new Image();
		preload_largeLink.className = 'preload_largeLink';
		objPreloader.appendChild(preload_largeLink);
		preload_saveLink = new Image();
		preload_saveLink.className = 'preload_saveLink';
		objPreloader.appendChild(preload_saveLink);
		preload_prevLink = new Image();
		preload_prevLink.className = 'preload_prevLink';
		objPreloader.appendChild(preload_prevLink);
		preload_nextLink = new Image();
		preload_nextLink.className = 'preload_nextLink';
		objPreloader.appendChild(preload_nextLink);
		
		$('imageData').onmouseover =
		$('imageContainer').onmouseover = function() {
			if ( $('imageContainer').title != '' ) {
				$('imageContainer').title = '';
				Element.setWidth( 'imageDataContainer', parseInt(Element.getStyle('outerImageContainer','width')) );
				new Effect.Appear(
					'imageDataContainer',
					{	duration: 1.0	}
				);
			}
			return false;
		}
		
		$('lightboxImage').style.margin = paddingSize + 'px';
		
		Element.setWidth('outerImageContainer', 100);
		Element.setHeight('outerImageContainer', 100);
		
		//alert('hello');
	
	},
	
	//
	//	start()
	//	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
	//
	start: function(imageLink) {	

		//hideSelectBoxes();

		// stretch overlay to fill page and fade in
		var arrayPageSize = getPageSize();
		Element.setHeight('overlay', arrayPageSize[1]);
		new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: overlayOpacity });

		imageArray = [];
		imageNum = 0;		

		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		// if image is NOT part of a set..
		if((imageLink.getAttribute('rel') == 'lightbox')){
			// add single image to imageArray
			imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));			
		} else {
		// if image is part of a set..

			// loop through anchors, find other images in set, and add them to imageArray
			for (var i=0; i<anchors.length; i++){
				var anchor = anchors[i];
				if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel'))){
					imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
				}
			}
			imageArray.removeDuplicates();
			while(imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++;}
		}

		// calculate top offset for the lightbox and display 
		var arrayPageSize = getPageSize();
		var arrayPageScroll = getPageScroll();
		var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 15);

		Element.setTop('lightbox', lightboxTop);
		Element.show('lightbox');
		
		this.changeImage(imageNum);
	},

	//
	//	changeImage()
	//	Hide most elements and preload image in preparation for resizing image container.
	//
	changeImage: function(imageNum) {	
		
		activeImage = imageNum;	// update global var
		myLightbox.setImage(imageArray[activeImage][0]);
		
	},
	
	setImage: function(src) {
		
		// hide elements during transition
		Element.show('loading');
		Element.hide('lightboxImage');
		Element.hide('hoverNav');
		Element.hide('prevLink');
		Element.hide('largeLink');
		Element.hide('saveLink');
		Element.hide('nextLink');
		Element.hide('imageDataContainer');
		//Element.hide('numberDisplay');		
		
		imgPreloader = new Image();
		
		// once image is preloaded, resize image container
		imgPreloader.onload=function(){
			Element.setSrc('lightboxImage', src);
			myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
		}
		
		imgPreloader.src = src;
		
	},

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

		// get current height and width
		this.wCur = Element.getWidth('outerImageContainer');
		this.hCur = Element.getHeight('outerImageContainer');

		// set the desired size
		var desired_width = imgWidth  + (paddingSize * 2);
		var desired_height = imgHeight  + (paddingSize * 2);
		
		if ( desired_width < minWidth)
			desired_width = minWidth;
		if ( desired_height < minHeight)
			desired_height = minHeight;
			
		// scalars based on change from old to new
		this.xScale = (desired_width / this.wCur) * 100;
		this.yScale = (desired_height / this.hCur) * 100;

		// calculate size difference between new and old image, and resize if necessary
		wDiff = (this.wCur - paddingSize * 2) - imgWidth;
		hDiff = (this.hCur - paddingSize * 2) - imgHeight;
		
		//alert(this.wCur+":"+imgWidth+":"+this.xScale+":"+wDiff+"\r\n"+this.hCur+":"+imgHeight+":"+this.yScale+":"+hDiff);
		// if new and old image are same size and no scaling transition is necessary, 
		// do a quick pause to prevent image flicker.
		var hDiff = !( hDiff >= 0 && hDiff <= 3 );
		var wDiff = !( wDiff >= 0 && wDiff <= 3 );
		//alert(this.wCur+":"+imgWidth+":"+this.xScale+":"+wDiff+"\r\n"+this.hCur+":"+imgHeight+":"+this.yScale+":"+hDiff);
		
		if( !hDiff && !wDiff ) {
			if ( navigator.appVersion.indexOf("MSIE") != -1 ) {
				pause(250);
			} else {
				pause(100);
			} 
		} else {
			if ( hDiff ) {
				new Effect.Scale(
					'outerImageContainer',
					this.yScale,
					{
						scaleX: false,
						duration: resizeDuration,
						queue: 'front'
					}
				);
			}
			
			if ( wDiff ) {
				new Effect.Scale(
					'outerImageContainer',
					this.xScale,
					{
						scaleY: false,
						duration: resizeDuration,
						queue: 'front'
					}
				);
			}
		}

		Element.setHeight('prevLink', imgHeight);
		Element.setHeight('largeLink', imgHeight);
		Element.setHeight('saveLink', imgHeight);
		Element.setHeight('nextLink', imgHeight);

		this.showImage();
	},
	
	//
	//	showImage()
	//	Display image and begin preloading neighbors.
	//
	showImage: function(){
		Element.hide('loading');
		new Effect.Appear('lightboxImage', { duration: 0.5, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
		
		this.preloadNeighborImages();
	},

	//
	//	updateDetails()
	//	Display caption, image number, and bottom nav.
	//
	updateDetails: function() {
		
		/*
		var current_width = Element.getWidth('outerImageContainer');
		alert(current_width);
		current_width = Math.round((current_width-(paddingSize*2))/3);
		current_width += 'px';
		alert(current_width);
		$('prevLink').style.width = current_width;
		$('largeLink').style.width = current_width;
		$('saveLink').style.width = current_width;
		$('nextLink').style.width = current_width;
		*/
	
		Element.show('caption');
		var seperator = ': ';
		var title_description = imageArray[activeImage][1].split(seperator);
		var title = '<span class="title">'+title_description[0]+'</span>';
		var description = '';
		if ( title_description.length > 1 ) {
			seperator = '<span class="seperator">'+seperator+'</span>';
			description = '<span class="description">'+title_description[1]+'</span>';
		} else
			seperator = '';
		Element.setInnerHTML( 'caption', title+seperator+description );
		
		// if image is part of set display 'Image x of x' 
		Element.setInnerHTML( 'numberDisplay', 'Image ' + eval(activeImage + 1) + ' of ' + imageArray.length);
		//Element.show('numberDisplay');
		
		$('imageContainer').title = 'mouse over me to show the image`s information';
		
		myLightbox.updateNav();
	},

	//
	//	updateNav()
	//	Display appropriate previous and next hover navigation.
	//
	updateNav: function() {
		
		Element.show('hoverNav');
				
		var src = Element.getSrc('lightboxImage');
		if( src.indexOf('/medium/') != -1 )
		{
			Element.show('largeLink');
		} else {
			Element.show('saveLink');
		}
		
		if(activeImage != 0)
		{	// if not first image in set, display prev image button
			Element.show('prevLink');
		} else {
			Element.show('prevLink');
			Element.setHeight( 'prevLink', 1 );
		}
		
		if(activeImage != (imageArray.length - 1))
		{	// if not last image in set, display next image button
			Element.show('nextLink');
		}
		
	},

	//
	//	preloadNeighborImages()
	//	Preload previous and next images.
	//
	preloadNeighborImages: function(){
		
		// remove all the preloaded images
		var objPreloader = $('preloader');
		var s = objPreloader.childNodes.length;
		for ( var i = 0; i < s; i++ )
			objPreloader.removeChild(objPreloader.childNodes[0]);

		// add some images to preload
		if((imageArray.length - 1) > activeImage){
			preloadNextImage = new Image();
			preloadNextImage.src = imageArray[activeImage + 1][0];
			objPreloader.appendChild(preloadNextImage);
		}
		if(activeImage > 0){
			preloadPrevImage = new Image();
			preloadPrevImage.src = imageArray[activeImage - 1][0];
			objPreloader.appendChild(preloadPrevImage);
		}
	
	},

	//
	//	end()
	//
	end: function() {
		Element.hide('lightbox');
		new Effect.Fade('overlay', { duration: 0.2});
		
		// remove all the preloaded images
		var objPreloader = $('preloader');
		var s = objPreloader.childNodes.length;
		for ( var i = 0; i < s; i++ )
			objPreloader.removeChild(objPreloader.childNodes[0]);
	}
}

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

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

	var yScroll;

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

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

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

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		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
		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 = windowWidth;
	} else {
		pageWidth = xScroll;
	}


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

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

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

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



function initLightbox() { myLightbox = new Lightbox(); }
Event.observe(window, 'load', initLightbox, false);