// -----------------------------------------------------------------------------------
//
//	Lightbox v2.04
/*

    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:			'/Scripts/lightbox/images/loading.gif',
	fileBottomNavCloseImage:	'/Scripts/lightbox/images/closelabel.gif',
	fileBottomHelpImage:		'/Scripts/lightbox/images/help.gif',
	fileBottomPrevImage:		'/Scripts/lightbox/images/prev.png',
	fileBottomNextImage:		'/Scripts/lightbox/images/next.png',
	fileBottomSpacerImage:		'/Scripts/lightbox/images/spacer.gif',
	fileBottomHelpMessage:		'Utilice su teclado para navegar:\n\nImagen Anterior: <FLECHA IZQ> o A\nImagen Siguiente: <FLECHA DERECHA> o S\nPara salir: X or ESC',
	fileBottomHelpTip:			'Ayuda',
	overlayOpacity: 0.8,   // controls transparency of shadow overlay

	animate: true,         // toggles resizing animations
	resizeSpeed: 7,        // 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: "Imagen",
	labelOf: "de"
	}, 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="/Scripts/lightbox/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="/Scripts/lightbox/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 })
							),
						Builder.node('span',{id:'navPrev'},
							Builder.node('img', { src: LightboxOptions.fileBottomPrevImage, alt: 'previus' })
							),
						Builder.node('span',{id:'navNext'},
							Builder.node('img', { src: LightboxOptions.fileBottomNextImage, alt: 'next' })
							),
						Builder.node('img', { src: LightboxOptions.fileBottomSpacerImage, alt: ' ' }),
						Builder.node('span',{id:'help'},
							Builder.node('img', { src: LightboxOptions.fileBottomHelpImage, alt: LightboxOptions.fileBottomHelpTip })
							)							
						])
					])
				)
			]));


		$('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));
		$('navPrev').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
		$('navNext').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));
		$('help').observe('click', (function(event) { alert( LightboxOptions.fileBottomHelpMessage ) }).bind(this));

		var th = this;
		(function(){
			var ids =
			'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink navPrev navNext loading loadingLink ' +
			'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose help';
			$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(imageNum < 0) { alert(imageNum); }
		if (LightboxOptions.animate) { this.loading.show(); }

		this.lightboxImage.hide();
		this.hoverNav.hide();
		this.prevLink.hide();
		this.nextLink.hide();
		this.navPrev.hide();
		this.navNext.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(this.imageArray.length > 1){
			setDis = LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + this.imageArray.length;
			this.numberDisplay.update( setDis ).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(); this.navPrev.show(); }
		// if not last image in set, display next image button
		if (this.activeImage < (this.imageArray.length - 1)) { this.nextLink.show(); this.navNext.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.match(/p|a/) || (keycode == 37)){ // display previous image
			if (this.activeImage != 0){
				 this.disableKeyboardNav();
				 this.changeImage(this.activeImage - 1);
				}
			}
		else if (key.match(/n|s/) || (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(); });