// -----------------------------------------------------------------------------------
//
//	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 = "/lightbox/images/loading.gif";		
var fileBottomNavCloseImage = "/lightbox/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) {

    //and flash *bug*  by kbii
    if (document.getElementById("flash") && document.getElementById("flash").style.visibility != "hidden") {
      document.getElementById("flash").style.visibility = "hidden";
    }

    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();
    //and flash *bug*  by kbii
    if (document.getElementById("flash") && document.getElementById("flash").style.visibility == "hidden") {
      setTimeout("document.getElementById('flash').style.visibility = 'visible'", 300);
    }
  }
}

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

//
// 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);