/* Lightbox */
//	Configuration
var fileLoadingImage = "../jscss/images/loading.gif";		
var fileBottomNavCloseImage = "../jscss/images/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
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
var Lightbox = Class.create();

Lightbox.prototype = {

// initialize()
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;}
}
}

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.
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
// Edited for Firefox
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.
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);