// -----------------------------------------------------------------------------------
//
//	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 :'fileadmin/www.aida.de/v3/images/lightbox/loading.gif',
    fileBottomNavCloseImage :'fileadmin/www.aida.de/v3/images/lightbox/close.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('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, imageTitle) {

        $$('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 (typeof(imageLink) === 'string') {
			this.imageArray.push( [ imageLink, imageTitle ]);
		} else if ((imageLink.rel == 'lightbox' || imageLink.hasClassName('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 ];
	}
}

var myLightbox = null;
/*
document.observe('dom:loaded', function() {
	myLightbox = new Lightbox();
});
*/
//var $ready = Element.observe.curry(document, 'dom:loaded');
var $ready = document.observe.bind(document).curry('dom:loaded'); 
$ready(function(){ myLightbox = new Lightbox(); });