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

		// 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();
    }
    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', '#');
    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');
    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);
  },


//
// 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) {

    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', "Image " + eval(activeImage + 1) + " of " + 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;
	
//	console.log(self.innerWidth);
  //	console.log(document.documentElement.clientWidth);

  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;
  }

//	console.log("xScroll " + xScroll)
  //	console.log("windowWidth " + windowWidth)

  // for small pages with total width less then width of the viewport
  if (xScroll < windowWidth) {
    pageWidth = xScroll;
  } else {
    pageWidth = windowWidth;
  }
//	console.log("pageWidth " + pageWidth)

  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 pause(numberMillis) {
	var curently = new Date().getTime() + sender;
	while (new Date().getTime();	
}
*/
// ---------------------------------------------------


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