// -----------------------------------------------------------------------------------
//
//	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() {
		LightboxOptions.fileLoadingImage = root_path+fileLoadingImage;
		LightboxOptions.fileBottomNavCloseImage = root_path+lightboxBottomNavCloseImage;
		
		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
	},
	
	//
	// 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) {
		if (!this.lxOverlay) {
			// 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="lxOverlay"></div>
			//  <div id="lightbox">
			//      <div id="lxOuterImageContainer">
			//          <div id="lxImageContainer">
			//              <img id="lxImage">
			//              <div style="" id="lxHoverNav">
			//                  <a href="#" id="lxNavClose"></a>
			//              </div>
			//              <div id="lxLoading">
			//                  <img src="images/loading.gif">
			//              </div>
			//          </div>
			//      </div>
			//      <div id="lxDataContainer">
			//          <div id="lxData"></div>
			//          <div id="lxBottomNav">
			//              <a href="#" id="lxPrevLink">&lt;</a>
			//              <div id="lxNumberDisplay"></div>
			//              <a href="#" id="lxNextLink">&gt;</a>
			//          </div>
			//      </div>
			//  </div>
			
			var objBody = $$('body')[0];
			
			objBody.appendChild(Builder.node('div',{id:'lxOverlay'}));
			
			objBody.appendChild(Builder.node('div',{id:'lightbox'},[
				Builder.node('div',{id:'lxOuterImageContainer'},
					Builder.node('div',{id:'lxImageContainer'},[
						Builder.node('img',{id:'lxImage'}),
						Builder.node('div',{id:'lxHoverNav'},
							Builder.node('a',{id:'lxNavClose',href:'#'})
						),
						Builder.node('div',{id:'lxLoading'}, 
							Builder.node('img',{src:LightboxOptions.fileLoadingImage})
						)
					])
				),
				Builder.node('div',{id:'lxDataContainer'},[
					Builder.node('div',{id:'lxData'}),
					Builder.node('div',{id:'lxBottomNav'},[
						Builder.node('a',{id:'lxPrevLink',href:'#'},"<<"),
						Builder.node('span',{id:'lxNumberDisplay'}," "),
						Builder.node('a',{id:'lxNextLink',href:'#'},">>")
					])
				])
			]));
			
			$('lxOverlay').hide().observe('click', (function() { this.end(); }).bind(this));
			$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
			$('lxOuterImageContainer').setStyle({ width: size, height: size });
			$('lxNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
			$('lxPrevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
			$('lxNextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
			
			var th = this;
			var ids = 
				'lxOverlay lightbox lxOuterImageContainer lxImageContainer lxImage lxHoverNav lxNavClose lxLoading '+
				'lxDataContainer lxData lxBottomNav lxPrevLink lxNumberDisplay lxNextLink';
			$w(ids).each(function(id){ th[id] = $(id); });
		}
		
		if (Prototype.Browser.IE) {
			$$('select').each(function(node){ node.style.visibility = 'hidden' });
		}
		
		// stretch overlay to fill page and fade in
		var arrayPageSize = this.getPageSize();
		$('lxOverlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
		
		new Effect.Appear(this.lxOverlay, { 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^="lightbox"]').
				collect(function(anchor){ return [anchor.href, anchor.title, anchor.rel.gsub(/^lightbox\[/, '').gsub(/\]$/, '')]; }).
				uniq();
			
			// checken, ob auch überall das http davor steht...
			var preImageLink="";
			var preImageArray="";
			if (this.imageArray[0][0].match(/^http:\/\/./) && !imageLink.href.match(/^http:\/\/./)) {
				preImageLink=this.imageArray[0][0].replace(/^(http:\/\/.+?)\/.+/, "$1");
			} else if (!this.imageArray[0][0].match(/^http:\/\/./) && imageLink.href.match(/^http:\/\/./)) {
				preImageArray=imageLink.href.replace(/^(http:\/\/.+?)\/.+/, "$1");
			}
			
			// vorher war hier eine while-schleife, die einen fehler produziert hat, wenns das übergebene bild gar nicht gibt
			// kann passieren, wenn protokoll+domain vorne mal steht und mal nicht.
			for (var i=0, tmp_count=this.imageArray.length; i<tmp_count; ++i) {
				if (preImageArray+this.imageArray[i][0] == preImageLink+imageLink.href) {
					imageNum=i;
					break;
				}
			}
		}
		
		// calculate top and left offset for the lightbox 
		var arrayPageScroll = document.viewport.getScrollOffsets();
		if (document.viewport.getHeight()/10<10) {
			var lightboxTop = arrayPageScroll[1] + 10;
		} else {
			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.lxLoading.show();
		this.lxImage.hide();
		this.lxHoverNav.hide();
		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
		this.lxDataContainer.setStyle({opacity: .0001});
		this.lxData.update(' ');
		this.lxPrevLink.hide();
		this.lxNumberDisplay.hide();
		this.lxNextLink.hide();
		
		var imgPreloader = new Image();
		
		// once image is preloaded, resize image container
		
		imgPreloader.onload = (function(){
			this.lxImage.src = this.imageArray[this.activeImage][0];
			this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
		}).bind(this);
		imgPreloader.src = this.imageArray[this.activeImage][0];
		
		var dbImgSettings=this.imageArray[this.activeImage][2].split("|");
		
		new Ajax.Request(root_path+lightboxLang+'/view/ajax/lightbox/getImageDesc/', {
			parameters: 'tool='+dbImgSettings[0]+'&spalte='+dbImgSettings[1]+'&sprach_connect='+dbImgSettings[2],
			onSuccess: function(transport) {
				if (transport.responseText.length>0) {
					$('lxData').update(transport.responseText);
				} else {
					$('lxData').update(' ');
				}
			}
		});
	},
	
	//
	//  resizeImageContainer()
	//
	resizeImageContainer: function(imgWidth, imgHeight) {
		// get current width and height
		var widthCurrent  = this.lxOuterImageContainer.getWidth();
		var heightCurrent = this.lxOuterImageContainer.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.lxOuterImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'}); 
		if (wDiff != 0) new Effect.Scale(this.lxOuterImageContainer, 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;
		}
		
		// if image is part of set display 'x/x' 
		this.lxNumberDisplay.update((this.activeImage+1)+"/"+this.imageArray.length);
		
		(function() {
			this.lxDataContainer.setStyle({ width: widthNew + 'px' });
			this.lxData.setStyle({ width: (widthNew-this.lxNumberDisplay.getWidth()-70>100 ? widthNew-this.lxNumberDisplay.getWidth()-70 : widthNew) + 'px' });
			
			this.showImage();
		}).bind(this).delay(timeout / 1000);
	},
	
	//
	//  showImage()
	//  Display image and begin preloading neighbors.
	//
	showImage: function() {
		this.lxLoading.hide();
		new Effect.Appear(this.lxImage, {
			duration: this.resizeDuration,
			queue: 'end',
			afterFinish: (function(){ this.updateDetails(); }).bind(this)
		});
		this.preloadNeighborImages();
	},
	
	//
	//  updateDetails()
	//  Display lxDescription, image number, and bottom nav.
	//
	updateDetails: function() {
		// if lxDescription is not null
//		if (this.imageArray[this.activeImage][1] != "") {
//			this.lxDescription.update(this.imageArray[this.activeImage][1]).show();
//		}
		
		
		new Effect.Parallel(
			[ 
				new Effect.SlideDown(this.lxDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),
				new Effect.Appear(this.lxDataContainer, { sync: true, duration: this.resizeDuration })
			], 
			{ 
				duration: this.resizeDuration,
				afterFinish: (function() {
					// update overlay size and update nav
					var arrayPageSize = this.getPageSize();
					this.lxOverlay.setStyle({ height: arrayPageSize[1] + 'px' });
					this.updateNav();
				}).bind(this)
			} 
		);
	},
	
	//
	//  updateNav()
	//  Display appropriate previous and next hover navigation.
	//
	updateNav: function() {
		this.lxHoverNav.show();
		
		// if not first image in set, display prev image button
		if (this.activeImage > 0) this.lxPrevLink.show();
		
		// if not last image in set, display next image button
		if (this.activeImage < (this.imageArray.length - 1)) this.lxNextLink.show();
		
		if (this.imageArray.length > 1) {
			this.lxNumberDisplay.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.lxOverlay, { duration: this.overlayDuration });
		if (Prototype.Browser.IE) {
			$$('select').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 usedLightbox;
if (Prototype.Browser.IE) {
	// mit dom_loaded gehts leider nicht wirklich
	Event.observe(window, 'load', function() { usedLightbox=new Lightbox(); });
} else {
	document.observe('dom:loaded', function () { usedLightbox=new Lightbox(); });
}