// -----------------------------------------------------------------------------------
//
//	Lightbox v2.01
//	by Lokesh Dhakar - http://www.huddletogether.com
//	3/31/06
//
//	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.org), Thomas Fuchs(mir.aculo.us), and others.
//
//
// -----------------------------------------------------------------------------------
/*
 Table of Contents
 -----------------
 Configuration
 Global Variables
 Extending Built-in Objects
 - Object.extend(Element)
 - Array.prototype.removeDuplicates()
 - Array.prototype.empty()
 Lightbox Class Declaration
 - initialize()
 - start()
 - changeImage()
 - resizeImageContainer()
 - showImage()
 - updateDetails()
 - updateNav()
 - enableKeyboardNav()
 - disableKeyboardNav()
 - keyboardAction()
 - preloadNeighborImages()
 - end()
 
 Miscellaneous Functions
 - getPageScroll()
 - getPageSize()
 - getKey()
 - listenKey()
 - showSelectBoxes()
 - hideSelectBoxes()
 - pause()
 - initLightbox()
 
 Function Calls
 - addLoadEvent(initLightbox)
 
 */
// -----------------------------------------------------------------------------------

//
//	Configuration
//
var lightbox_image_dir = "http://img.date2.jp/img/lightbox";
var fileLoadingImage = lightbox_image_dir + "/loading.gif";
var fileBottomNavCloseImage = lightbox_image_dir + "/closelabel.gif";

var resizeSpeed = 7; // controls the speed of the image resizing (1=slowest and 10=fastest)
var borderSize = 10; //if you adjust the padding in the CSS, you will need to update this variable
// -----------------------------------------------------------------------------------

//
//	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;
	},
	setHref: function(element, href){
		element = $(element);
		element.href = href;
	},
	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();
	}
}

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

//
//	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. 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="nextLink"></a>
		//				</div>
		//				<div id="loading">
		//					<a href="#" id="loadingLink">
		//						<img src="img/lightbox/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 objOverlay = document.createElement("div");
		objOverlay.setAttribute('id', 'overlay');
		objOverlay.style.display = 'none';
		objOverlay.onclick = function(){
			myLightbox.end();
			return false;
		}
		objBody.appendChild(objOverlay);
		
		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');
		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 objLoading = document.createElement("div");
		objLoading.setAttribute('id', 'loading');
		objImageContainer.appendChild(objLoading);
		
		var objLoadingLink = document.createElement("a");
		objLoadingLink.setAttribute('id', 'loadingLink');
		objLoadingLink.setAttribute('href', '#');
		objLoadingLink.onclick = function(){
			myLightbox.end();
			return false;
		}
		objLoading.appendChild(objLoadingLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.setAttribute('src', fileLoadingImage);
		objLoadingLink.appendChild(objLoadingImage);
		
		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');
		objImageData.appendChild(objBottomNav);
		
		var objBottomNavCloseLink = document.createElement("a");
		objBottomNavCloseLink.setAttribute('id', 'bottomNavClose');
		objBottomNavCloseLink.setAttribute('href', '#');
		objBottomNavCloseLink.onclick = function(){
			myLightbox.end();
			return false;
		}
		objBottomNav.appendChild(objBottomNavCloseLink);
		
		var objBottomNavCloseImage = document.createElement("img");
		objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
		objBottomNavCloseLink.appendChild(objBottomNavCloseImage);
	},
	
	//
	//	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: 0.8
		});
		
		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
		// hide elements during transition
		Element.show('loading');
		Element.hide('lightboxImage');
		Element.hide('hoverNav');
		Element.hide('prevLink');
		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', imageArray[activeImage][0]);
			myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
		}
		imgPreloader.src = imageArray[activeImage][0];
	},
	
	//
	//	resizeImageContainer()
	//
	resizeImageContainer: function(imgWidth, imgHeight){
	
		// get current height and width
		this.wCur = Element.getWidth('outerImageContainer');
		this.hCur = Element.getHeight('outerImageContainer');
		
		// scalars based on change from old to new
		this.xScale = ((imgWidth + (borderSize * 2)) / this.wCur) * 100;
		this.yScale = ((imgHeight + (borderSize * 2)) / this.hCur) * 100;
		
		// calculate size difference between new and old image, and resize if necessary
		wDiff = (this.wCur - borderSize * 2) - imgWidth;
		hDiff = (this.hCur - borderSize * 2) - imgHeight;
		
		if (!(hDiff == 0)) {
			new Effect.Scale('outerImageContainer', this.yScale, {
				scaleX: false,
				duration: resizeDuration,
				queue: 'front'
			});
		}
		if (!(wDiff == 0)) {
			new Effect.Scale('outerImageContainer', this.xScale, {
				scaleY: false,
				delay: resizeDuration,
				duration: resizeDuration
			});
		}
		
		// 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);
			}
		}
		
		Element.setHeight('prevLink', imgHeight);
		Element.setHeight('nextLink', imgHeight);
		Element.setWidth('imageDataContainer', imgWidth + (borderSize * 2));
		
		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(){
	
		Element.show('caption');
		Element.setInnerHTML('caption', imageArray[activeImage][1]);
		
		// if image is part of set display 'Image x of x' 
		if (imageArray.length > 1) {
			Element.show('numberDisplay');
			Element.setInnerHTML('numberDisplay', "Image " + eval(activeImage + 1) + " of " + imageArray.length);
		}
		
		new Effect.Parallel([new Effect.SlideDown('imageDataContainer', {
			sync: true,
			duration: resizeDuration + 0.25,
			from: 0.0,
			to: 1.0
		}), new Effect.Appear('imageDataContainer', {
			sync: true,
			duration: 1.0
		})], {
			duration: 0.65,
			afterFinish: function(){
				myLightbox.updateNav();
			}
		});
	},
	
	//
	//	updateNav()
	//	Display appropriate previous and next hover navigation.
	//
	updateNav: function(){
	
		Element.show('hoverNav');
		
		// if not first image in set, display prev image button
		if (activeImage != 0) {
			Element.show('prevLink');
			document.getElementById('prevLink').onclick = function(){
				myLightbox.changeImage(activeImage - 1);
				return false;
			}
		}
		
		// if not last image in set, display next image button
		if (activeImage != (imageArray.length - 1)) {
			Element.show('nextLink');
			document.getElementById('nextLink').onclick = function(){
				myLightbox.changeImage(activeImage + 1);
				return false;
			}
		}
		
		this.enableKeyboardNav();
	},
	
	//
	//	enableKeyboardNav()
	//
	enableKeyboardNav: function(){
		document.onkeydown = this.keyboardAction;
	},
	
	//
	//	disableKeyboardNav()
	//
	disableKeyboardNav: function(){
		document.onkeydown = '';
	},
	
	//
	//	keyboardAction()
	//
	keyboardAction: function(e){
		if (e == null) { // ie
			keycode = event.keyCode;
		} else { // mozilla
			keycode = e.which;
		}
		
		key = String.fromCharCode(keycode).toLowerCase();
		
		if ((key == 'x') || (key == 'o') || (key == 'c')) { // close lightbox
			myLightbox.end();
		} else if (key == 'p') { // display previous image
			if (activeImage != 0) {
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage - 1);
			}
		} else if (key == 'n') { // display next image
			if (activeImage != (imageArray.length - 1)) {
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage + 1);
			}
		}
		
		
	},
	
	//
	//	preloadNeighborImages()
	//	Preload previous and next images.
	//
	preloadNeighborImages: function(){
	
		if ((imageArray.length - 1) > activeImage) {
			preloadNextImage = new Image();
			preloadNextImage.src = imageArray[activeImage + 1][0];
		}
		if (activeImage > 0) {
			preloadPrevImage = new Image();
			preloadPrevImage.src = imageArray[activeImage - 1][0];
		}
		
	},
	
	//
	//	end()
	//
	end: function(){
		this.disableKeyboardNav();
		Element.hide('lightbox');
		new Effect.Fade('overlay', {
			duration: 0.2
		});
		showSelectBoxes();
	}
}

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

//
// 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;
}

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

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//
function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if (key == 'x') {
	}
}

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

//
// listenKey()
//
function listenKey(){
	document.onkeypress = getKey;
}

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

function showSelectBoxes(){
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
}

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

function hideSelectBoxes(){
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "hidden";
	}
}

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

//
// 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;
	}
}

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

var myLightbox = null;

function initLightbox(){
	myLightbox = new Lightbox();
	updateFunctions.push([myLightbox.set_images, myLightbox]);
}

Event.observe(window, 'load', initLightbox, false);