// -----------------------------------------------------------------------------------
//
//  Litebox v1.0
//  A combined effort between detrate and gannon
//  07/03/06
//
//  Source edited from Lightbox v2.02
//  by Lokesh Dhakar - http://www.huddletogether.com
//
//  For more information on this script, visit:
//  http://doknowevil.net/litebox
//
//  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.
//
// -----------------------------------------------------------------------------------

//
//  Configuration
//
var fileLoadingImage = "images/loading.gif";
var fileBottomNavCloseImage = "images/closelabel.gif";
var resizeSpeed = 6;  // 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) * 100;

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

//
//  Additional methods for Element added by SU, Couloir
//  - further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
  hide: function() {
    for (var i = 0; i < arguments.length; i++) {
      var element = $(arguments[i]);
      element.style.display = 'none';
    }
  },
  show: function() {
    for (var i = 0; i < arguments.length; i++) {
      var element = $(arguments[i]);
      element.style.display = '';
    }
  },
  getWidth: function(element) {
       element = $(element);
       return element.offsetWidth; 
  },
  setWidth: function(element,w) {
       element = $(element);
    element.style.width = w +"px";
  },
  getHeight: function(element) {
    element = $(element);
    return element.offsetHeight;
  },
  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; 
  },
  setInnerHTML: function(element,content) {
    element = $(element);
    element.innerHTML = content;
  }
});

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

//
//  Extending built-in Array object
//
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();
  }
}

// -----------------------------------------------------------------------------------
//
//  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;}
      }
    }

    var objBody = document.getElementsByTagName("body").item(0);
    
    var objOverlay = document.createElement("div");
    objOverlay.setAttribute('id','overlay');
    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);
    
    overlayEffect = new fx.Opacity(objOverlay, { duration: 300 });  
    overlayEffect.hide();
    
    imageEffect = new fx.Opacity(objLightboxImage, { duration: 350, onComplete: function() { imageDetailsEffect.custom(0,1); }});
    imageEffect.hide();
    
    imageDetailsEffect = new fx.Opacity('imageDataContainer', { duration: 400, onComplete: function() { navEffect.custom(0,1); }}); 
    imageDetailsEffect.hide();
    
    navEffect = new fx.Opacity('hoverNav', { duration: 100 });
    navEffect.hide();
  },
  
  //
  //  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]);
    overlayEffect.custom(0,0.8);
    
    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');
    imageDetailsEffect.hide();
    imageEffect.hide();
    navEffect.hide();
    Element.hide('prevLink');
    Element.hide('nextLink');
    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');

    // calculate size difference between new and old image, and resize if necessary
    wDiff = (this.wCur - borderSize * 2) - imgWidth;
    hDiff = (this.hCur - borderSize * 2) - imgHeight;
    
    // Resize the outerImageContainer very sexy like
    reHeight = new fx.Height('outerImageContainer', { duration: resizeDuration });
    reHeight.custom(Element.getHeight('outerImageContainer'),imgHeight+(borderSize*2)); 
    reWidth = new fx.Width('outerImageContainer', { duration: resizeDuration, onComplete: function() { imageEffect.custom(0,1); }});
    reWidth.custom(Element.getWidth('outerImageContainer'),imgWidth+(borderSize*2));

    // 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));
    Element.setWidth( 'hoverNav', imgWidth + (borderSize * 2));
    
    this.showImage();
  },
  
  //
  //  showImage()
  //  Display image and begin preloading neighbors.
  //
  showImage: function(){
    Element.hide('loading');
    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);
    }

    myLightbox.updateNav();
  },
  //
  //  updateNav()
  //  Display appropriate previous and next hover navigation.
  //
  updateNav: function() {

    // 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');
    imageEffect.toggle();
    overlayEffect.custom(0.8,0);
    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(); }