// -----------------------------------------------------------------------------------
//
//	Lightbox v2.04
//	by Lokesh Dhakar - http://www.lokeshdhakar.com
//	Last Modification: 2/9/08
//
//	For more information, visit:
//	http://lokeshdhakar.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//  	- Free for use in both personal and commercial projects
//		- Attribution requires leaving author name, author link, and the license info intact.
//
//  Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
//  		Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
//
// -----------------------------------------------------------------------------------
/*

    Table of Contents
    -----------------
    Configuration

    Lightbox Class Declaration
    - initialize()
    - updateImageList()
    - start()
    - changeImage()
    - resizeImageContainer()
    - showImage()
    - updateDetails()
    - updateNav()
    - enableKeyboardNav()
    - disableKeyboardNav()
    - keyboardAction()
    - preloadNeighborImages()
    - end()

    Function Calls
    - document.observe()

*/
// -----------------------------------------------------------------------------------

//
//  Configurationl
//
LightboxOptions = Object.extend({
	fileLoadingImage:        '/_images/loading.gif',
	fileBottomNavCloseImage: '/_images/closelabel.gif',

	overlayOpacity: 0.8,   // controls transparency of shadow overlay

	animate: true,         // toggles resizing animations
	resizeSpeed: 9,        // controls the speed of the image resizing animations (1=slowest and 10=fastest)

	borderSize: 10,         //if you adjust the padding in the CSS, you will need to update this variable

	// When grouping images this is used to write: Image # of #.
	// Change it for non-english localization
	labelImage: "Image",
	labelOf: "of"
}, window.LightboxOptions || {});

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

var Lightbox = Class.create();

Lightbox.prototype = {
    imageArray: [],
    activeImage: undefined,

    // 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();

	 this.keyboardAction = this.keyboardAction.bindAsEventListener(this);

	 if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
	 if (LightboxOptions.resizeSpeed < 1)  LightboxOptions.resizeSpeed = 1;

	    this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
	    this.overlayDuration = LightboxOptions.animate ? 0.2 : 0;  // shadow fade in/out duration

	 // 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.
	 var size = (LightboxOptions.animate ? 250 : 1) + 'px';


	 // 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 = $$('body')[0];

		objBody.appendChild(Builder.node('div',{id:'overlay'}));

	 objBody.appendChild(Builder.node('div',{id:'lightbox'}, [
	     Builder.node('div',{id:'outerImageContainer'},
		  Builder.node('div',{id:'imageContainer'}, [
		      Builder.node('img',{id:'lightboxImage'}),
		      Builder.node('div',{id:'hoverNav'}, [
			   Builder.node('a',{id:'prevLink', href: '#' }),
			   Builder.node('a',{id:'nextLink', href: '#' })
		      ]),
		      Builder.node('div',{id:'loading'},
			   Builder.node('a',{id:'loadingLink', href: '#' },
				Builder.node('img', {src: LightboxOptions.fileLoadingImage})
			   )
		      )
		  ])
	     ),
	     Builder.node('div', {id:'imageDataContainer'},
		  Builder.node('div',{id:'imageData'}, [
		      Builder.node('div',{id:'imageDetails'}, [
			   Builder.node('span',{id:'caption'}),
			   Builder.node('span',{id:'numberDisplay'})
		      ]),
		      Builder.node('div',{id:'bottomNav'},
			   Builder.node('a',{id:'bottomNavClose', href: '#' },
				Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
			   )
		      )
		  ])
	     )
	 ]));


		$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
		$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
		$('outerImageContainer').setStyle({ width: size, height: size });
		$('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
		$('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
		$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
		$('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));

	 var th = this;
	 (function(){
	     var ids =
		  'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' +
		  'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';
	     $w(ids).each(function(id){ th[id] = $(id); });
	 }).defer();
    },

    //
    // 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() {
	 this.updateImageList = Prototype.emptyFunction;

	 document.observe('click', (function(event){
	     var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
	     if (target) {
		  event.stop();
		  this.start(target);
	     }
	 }).bind(this));
    },

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

	 $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });

	 // stretch overlay to fill page and fade in
	 var arrayPageSize = this.getPageSize();
	 $('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });

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

	 this.imageArray = [];
	 var imageNum = 0;

	 if ((imageLink.rel == 'lightbox')){
	     // if image is NOT part of a set, add single image to imageArray
	     this.imageArray.push([imageLink.href, imageLink.title]);
	 } else {
	     // if image is part of a set..
	     this.imageArray =
		  $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
		  collect(function(anchor){ return [anchor.href, anchor.title]; }).
		  uniq();

	     while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
	 }

	 // calculate top and left offset for the lightbox
	 var arrayPageScroll = document.viewport.getScrollOffsets();
	 var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
	 var lightboxLeft = arrayPageScroll[0];
	 this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();

	 this.changeImage(imageNum);
    },

    //
    //  changeImage()
    //  Hide most elements and preload image in preparation for resizing image container.
    //
    changeImage: function(imageNum) {

	 this.activeImage = imageNum; // update global var

	 // hide elements during transition
	 if (LightboxOptions.animate) this.loading.show();
	 this.lightboxImage.hide();
	 this.hoverNav.hide();
	 this.prevLink.hide();
	 this.nextLink.hide();
		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
	 this.imageDataContainer.setStyle({opacity: .0001});
	 this.numberDisplay.hide();

	 var imgPreloader = new Image();

	 // once image is preloaded, resize image container


	 imgPreloader.onload = (function(){
	     this.lightboxImage.src = this.imageArray[this.activeImage][0];
	     this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
	 }).bind(this);
	 imgPreloader.src = this.imageArray[this.activeImage][0];
    },

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

	 // get current width and height
	 var widthCurrent  = this.outerImageContainer.getWidth();
	 var heightCurrent = this.outerImageContainer.getHeight();

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

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

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

	 if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'});
	 if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration});

	 // if new and old image are same size and no scaling transition is necessary,
	 // do a quick pause to prevent image flicker.
	 var timeout = 0;
	 if ((hDiff == 0) && (wDiff == 0)){
	     timeout = 100;
	     if (Prototype.Browser.IE) timeout = 250;
	 }

	 (function(){
	     this.prevLink.setStyle({ height: imgHeight + 'px' });
	     this.nextLink.setStyle({ height: imgHeight + 'px' });
	     this.imageDataContainer.setStyle({ width: widthNew + 'px' });

	     this.showImage();
	 }).bind(this).delay(timeout / 1000);
    },

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

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

	 // if caption is not null
	 if (this.imageArray[this.activeImage][1] != ""){
	     this.caption.update(this.imageArray[this.activeImage][1]).show();
	 }

	 // if image is part of set display 'Image x of x'
	 if (this.imageArray.length > 1){
	     this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + this.imageArray.length).show();
	 }

	 new Effect.Parallel(
	     [
		  new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),
		  new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration })
	     ],
	     {
		  duration: this.resizeDuration,
		  afterFinish: (function() {
			  // update overlay size and update nav
			  var arrayPageSize = this.getPageSize();
			  this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
			  this.updateNav();
		  }).bind(this)
	     }
	 );
    },

    //
    //  updateNav()
    //  Display appropriate previous and next hover navigation.
    //
    updateNav: function() {

	 this.hoverNav.show();

	 // if not first image in set, display prev image button
	 if (this.activeImage > 0) this.prevLink.show();

	 // if not last image in set, display next image button
	 if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();

	 this.enableKeyboardNav();
    },

    //
    //  enableKeyboardNav()
    //
    enableKeyboardNav: function() {
	 document.observe('keydown', this.keyboardAction);
    },

    //
    //  disableKeyboardNav()
    //
    disableKeyboardNav: function() {
	 document.stopObserving('keydown', this.keyboardAction);
    },

    //
    //  keyboardAction()
    //
    keyboardAction: function(event) {
	 var keycode = event.keyCode;

	 var escapeKey;
	 if (event.DOM_VK_ESCAPE) {  // mozilla
	     escapeKey = event.DOM_VK_ESCAPE;
	 } else { // ie
	     escapeKey = 27;
	 }

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

	 if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
	     this.end();
	 } else if ((key == 'p') || (keycode == 37)){ // display previous image
	     if (this.activeImage != 0){
		  this.disableKeyboardNav();
		  this.changeImage(this.activeImage - 1);
	     }
	 } else if ((key == 'n') || (keycode == 39)){ // display next image
	     if (this.activeImage != (this.imageArray.length - 1)){
		  this.disableKeyboardNav();
		  this.changeImage(this.activeImage + 1);
	     }
	 }
    },

    //
    //  preloadNeighborImages()
    //  Preload previous and next images.
    //
    preloadNeighborImages: function(){
	 var preloadNextImage, preloadPrevImage;
	 if (this.imageArray.length > this.activeImage + 1){
	     preloadNextImage = new Image();
	     preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
	 }
	 if (this.activeImage > 0){
	     preloadPrevImage = new Image();
	     preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
	 }

    },

    //
    //  end()
    //
    end: function() {
	 this.disableKeyboardNav();
	 this.lightbox.hide();
	 new Effect.Fade(this.overlay, { duration: this.overlayDuration });
	 $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
    },

    //
    //  getPageSize()
    //
    getPageSize: function() {

	     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;
		}

		return [pageWidth,pageHeight];
	}
}

document.observe('dom:loaded', function () { new Lightbox(); });