// -----------------------------------------------------------------------------------
//
// Lightbox v2.03.3
// by Lokesh Dhakar - http://www.huddletogether.com
// 5/21/06
// 
// 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.com), 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()
 - updateImageList()
 - start()
 - changeImage()
 - resizeImageContainer()
 - showImage()
 - updateDetails()
 - updateNav()
 - enableKeyboardNav()
 - disableKeyboardNav()
 - keyboardAction()
 - preloadNeighborImages()
 - end()
 
 Miscellaneous Functions
 - getPageScroll()
 - getPageSize()
 - getKey()
 - listenKey()
 - showSelectBoxes()
 - hideSelectBoxes()
 - showFlash()
 - hideFlash()
 - pause()
 - initLightbox()
 
 Function Calls
 - addLoadEvent(initLightbox)
 
*/

// -----------------------------------------------------------------------------------
//
// Configuration
//
// var fileLoadingImage = "images/loading.gif";
// var fileBottomNavCloseImage = "images/closelabel.gif";

var overlayOpacity = 0.8;	// controls transparency of shadow overlay
var animate = true;   // toggles resizing animations
var resizeSpeed = 7;  // controls the speed of the image resizing animations (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(animate == true){
  overlayDuration = 0.2; // shadow fade in/out duration
  if(resizeSpeed > 10){ resizeSpeed = 10;}
  if(resizeSpeed < 1){ resizeSpeed = 1;}
  resizeDuration = (11 - resizeSpeed) * 0.15;
} else {
  overlayDuration = 0;
  resizeDuration = 0;
}

// -----------------------------------------------------------------------------------
//
// 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";
  },
  setLeft: function(element,l) {
    element = $(element);
    element.style.left = l +"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 = 0; i < this.length; i++){
    for(j = this.length-1; j>i; j--){
      if(this[i][0] == this[j][0]){
        this.splice(j,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. Calls updateImageList and then
  // the function inserts html at the bottom of the page which is used to display the shadow 
  // overlay and the image container.
  //
  initialize: function() {
    this.updateImageList();

    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(); };
    objBody.appendChild(objOverlay);

    var objLightbox = document.createElement("div");
    objLightbox.setAttribute('id','lightbox');
    objLightbox.style.display = 'none';
    objLightbox.onclick = function(e) { // close Lightbox is user clicks shadow overlay
      if (!e) var e = window.event;
      var clickObj = Event.element(e).id;
      if ( clickObj == 'lightbox') {
        myLightbox.end();
      }
    };
    objBody.appendChild(objLightbox);

    var objOuterImageContainer = document.createElement("div");
    objOuterImageContainer.setAttribute('id','outerImageContainer');
    objLightbox.appendChild(objOuterImageContainer);

    // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
    // If animations are turned off, it will be hidden as to prevent a flicker of a
    // white 250 by 250 box.
    if(animate){
      Element.setWidth('outerImageContainer', 250);
      Element.setHeight('outerImageContainer', 250);
    } else {
      Element.setWidth('outerImageContainer', 1);
      Element.setHeight('outerImageContainer', 1);
    }

    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','#');
    objPrevLink.setAttribute('title','Prev');
    objHoverNav.appendChild(objPrevLink);

    var objNextLink = document.createElement("a");
    objNextLink.setAttribute('id','nextLink');
    objNextLink.setAttribute('href','#');
    objNextLink.setAttribute('title','Next');
    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');
    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);

  },

  //
  // updateImageList()
  // Loops through anchor tags looking for 'lightbox' references and applies onclick
  // events to appropriate links. You can rerun after dynamically adding images w/ajax.
  //
  updateImageList: function() {
    if (!document.getElementsByTagName){ return; }
    var anchors = document.getElementsByTagName('a');
    var areas = document.getElementsByTagName('area');
    // 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;};
      }
    }
    // loop through all area tags
    // todo: combine anchor & area tag loops
    for (var i=0; i< areas.length; i++){
      var area = areas[i];

      var relAttribute = String(area.getAttribute('rel'));

      // use the string.match() method to catch 'lightbox' references in the rel attribute
      if (area.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
        area.onclick = function () {myLightbox.start(this); return false;};
      }
    }
  },

  //
  // start()
  // Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
  //
  start: function(imageLink) {

    // Hack: start on first image if no imageLink is provided
    if(imageLink == null){
      var all_images = document.getElementsByTagName('a');
      // loop through all anchor tags
      for (var i=0; i<all_images.length; i++){
        var current_image = all_images[i];
        var relAttribute = String(current_image.getAttribute('rel'));
        // use the string.match() method to catch 'lightbox' references in the rel attribute
        if (current_image.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
          imageLink = current_image;
          break;
        }
      }
    }
    hideSelectBoxes();
    hideFlash();

    // stretch overlay to fill page and fade in
    var arrayPageSize = getPageSize();
    Element.setWidth('overlay', arrayPageSize[0]);
    Element.setHeight('overlay', arrayPageSize[1]);

    new Effect.Appear('overlay', { duration: overlayDuration, from: 0.0, to: overlayOpacity });

    imageArray = [];
    imageNum = 0;

    if (!document.getElementsByTagName){ return; }
    var anchors = document.getElementsByTagName( imageLink.tagName);

    // 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 and left offset for the lightbox 
    var arrayPageScroll = getPageScroll();
    var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);
    var lightboxLeft = arrayPageScroll[0];
    Element.setTop('lightbox', lightboxTop);
    Element.setLeft('lightbox', lightboxLeft);

    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
    if(animate){ 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.onload=function(){}; // clear onLoad, IE behaves irratically with animated gifs otherwise
    };
    imgPreloader.src = imageArray[activeImage][0];
  },

  //
  // resizeImageContainer()
  //
  resizeImageContainer: function( imgWidth, imgHeight) {

    // get curren width and height
    this.widthCurrent = Element.getWidth('outerImageContainer');
    this.heightCurrent = Element.getHeight('outerImageContainer');

    // get new width and height
    var widthNew = (imgWidth  + (borderSize * 2));
    var heightNew = (imgHeight  + (borderSize * 2));

    // scalars based on change from old to new
    this.xScale = ( widthNew / this.widthCurrent) * 100;
    this.yScale = ( heightNew / this.heightCurrent) * 100;

    // calculate size difference between new and old image, and resize if necessary
    wDiff = this.widthCurrent - widthNew;
    hDiff = this.heightCurrent - heightNew;

    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', widthNew);

    this.showImage();
  },

  //
  // showImage()
  // Display image and begin preloading neighbors.
  //
  showImage: function(){
    Element.hide('loading');
    new Effect.Appear('lightboxImage', { duration: resizeDuration, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
    this.preloadNeighborImages();
  },

  //
  // updateDetails()
  // Display caption, image number, and bottom nav.
  //
  updateDetails: function() {

    // if caption is not null
    /*
    if(imageArray[activeImage][1]){
      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', eval(activeImage + 1) + "/" + imageArray.length);
    }
    new Effect.Parallel(
      [
        new Effect.SlideDown( 'imageDataContainer', { sync: true, duration: resizeDuration, from: 0.0, to: 1.0 }),
        new Effect.Appear('imageDataContainer', { sync: true, duration: resizeDuration })
      ],
      {
        duration: resizeDuration, afterFinish: function() {
          // update overlay size and update nav
          var arrayPageSize = getPageSize();
          Element.setHeight('overlay', arrayPageSize[1]);
          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;
      escapeKey = 27;
    } else { // mozilla
      keycode = e.keyCode;
      escapeKey = e.DOM_VK_ESCAPE;
    }

    key = String.fromCharCode(keycode).toLowerCase();

    if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox
      myLightbox.end();
    } else if((key == 'p') || (keycode == 37)){ // display previous image
      if(activeImage != 0){
        myLightbox.disableKeyboardNav();
        myLightbox.changeImage(activeImage - 1);
      }
    } else if((key == 'n') || (keycode == 39)){	// 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: overlayDuration});
    showSelectBoxes();
    showFlash();
  }
};

// -----------------------------------------------------------------------------------
//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.com
//
function getPageScroll(){
  var xScroll, yScroll;
  if (self.pageYOffset) {
    yScroll = self.pageYOffset;
    xScroll = self.pageXOffset;
  } else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
    yScroll = document.documentElement.scrollTop;
    xScroll = document.documentElement.scrollLeft;
  } else if (document.body) {// all other Explorers
    yScroll = document.body.scrollTop;
    xScroll = document.body.scrollLeft;	
  }
  arrayPageScroll = new Array(xScroll,yScroll);
  return arrayPageScroll;
}

// -----------------------------------------------------------------------------------
//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.com
// Edit for Firefox by pHaez
//
function getPageSize(){
  var xScroll, yScroll;

  if (window.innerHeight && window.scrollMaxY) {
    xScroll = window.innerWidth + window.scrollMaxX;
    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
    if(document.documentElement.clientWidth){
      windowWidth = document.documentElement.clientWidth; 
    } else {
      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 = xScroll;		
  } else {
    pageWidth = windowWidth;
  }
  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(){
  var selects = document.getElementsByTagName("select");
  for (i = 0; i != selects.length; i++) {
    selects[i].style.visibility = "visible";
  }
}

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

// ---------------------------------------------------
function showFlash(){
  var flashObjects = document.getElementsByTagName("object");
  for (i = 0; i < flashObjects.length; i++) {
    flashObjects[i].style.visibility = "visible";
  }

  var flashEmbeds = document.getElementsByTagName("embed");
  for (i = 0; i < flashEmbeds.length; i++) {
    flashEmbeds[i].style.visibility = "visible";
  }
}

// ---------------------------------------------------
function hideFlash(){
  var flashObjects = document.getElementsByTagName("object");
  for (i = 0; i < flashObjects.length; i++) {
    flashObjects[i].style.visibility = "hidden";
  }
  var flashEmbeds = document.getElementsByTagName("embed");
  for (i = 0; i < flashEmbeds.length; i++) {
    flashEmbeds[i].style.visibility = "hidden";
  }
}

// ---------------------------------------------------
//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Help from Ran Bar-On [ran2103@gmail.com]
//
function pause(ms){
  var date = new Date();
  curDate = null;
  do{var curDate = new Date();}
  while( curDate - date < ms);
}
// ---------------------------------------------------

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