// -----------------------------------------------------------------------------------
//
//	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: 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: "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('iframe', { id: 'lightboxFrame', frameborder: '0' }),
                    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) {
		if (this.lightboxFrame == null) {
			this.lightboxFrame = $('lightboxFrame');
		}

		this.activeImage = imageNum; // update global var

		// hide elements during transition
		if (LightboxOptions.animate) this.loading.show();
		this.lightboxFrame.hide();
		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 imgSrc = this.imageArray[this.activeImage][0];
		if (imgSrc.indexOf(".gif") > -1 || imgSrc.indexOf(".jpg") > -1 || imgSrc.indexOf(".jpeg") > -1 || imgSrc.indexOf(".png") > -1) {
			this.setupImage();
		} else {
			this.setupPage();
		}
	},

	setupImage: function() {
		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, false);
		}).bind(this);
		imgPreloader.src = this.imageArray[this.activeImage][0];
	},

	setupPage: function() {
		this.lightboxFrame.src = this.imageArray[this.activeImage][0];
		this.lightboxFrame.style.height = '340px';
		this.lightboxFrame.style.width = '450px';

		this.resizeImageContainer(480, 350, true);
	},

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

		// 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' });

			if (isWin) {
				this.showFrame();
			} else {
				this.showImage();
			}
		}).bind(this).delay(timeout / 1000);
	},

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

	//
	//  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( false ); }).bind(this)
		});
		this.preloadNeighborImages();
	},

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

		// 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( isWin );
            	}).bind(this)
            }
        );
	},

	//
	//  updateNav()
	//  Display appropriate previous and next hover navigation.
	//
	updateNav: function( isWin ) {
		if( !isWin ){
			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(); });