// -----------------------------------------------------------------------------------
//
// 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);