// -----------------------------------------------------------------------------------
//
//       Lightbox v2.02
//       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 fileLoadingImage = "images/loading.gif";              
var fileBottomNavCloseImage = "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 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="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 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;
       }
}

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



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