// -----------------------------------------------------------------------------------
//
//	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 = "img/loading.gif";
var fileBottomNavCloseImage = "img/bt_fechar.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);