var fileLoadingImage = "/_img/lb/loading.gif";
var resizeSpeed = 8;
var borderSize = 10;
var imageArray = new Array;
var activeImage;
var imgResized=true;
var originalWidth=0;
var originalHeight=0;
var myLightbox;

if(resizeSpeed > 10){ resizeSpeed = 10;}
if(resizeSpeed < 1){ resizeSpeed = 1;}
resizeDuration = (11 - resizeSpeed) * 0.15;


Object.extend(Element, {
	getWidth: function(element) {
	   	element = $(element);
	   	return element.offsetWidth;
	},
	setWidth: function(element,w) {
	   	element = $(element);
    	element.style.width = w +"px";
	},
	setHeight: function(element,h) {
   		element = $(element);
    	element.style.height = h +"px";
	},
	setTop: function(element,t) {
	   	element = $(element);
    	element.style.top = t +"px";
	},
	setSrc: function(element,src) {
    	element = $(element);
    	element.src = src;
	},
	setHref: function(element,href) {
    	element = $(element);
    	element.href = href;
	},
	setInnerHTML: function(element,content) {
		element = $(element);
		element.innerHTML = content;
	}
});

Array.prototype.removeDuplicates = function () {
	for(i = 1; i < this.length; i++){
		if(this[i][0] == this[i-1][0]){
			this.splice(i,1);
		}
	}
}

Array.prototype.empty = function () {
	for(i = 0; i <= this.length; i++){
		this.shift();
	}
}


var Lightbox = Class.create();

Lightbox.prototype = {

	initialize: function() {
		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		for (var i=0; i<anchors.length; i++){
			var anchor = anchors[i];

			var relAttribute = String(anchor.getAttribute('rel'));

			if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox') || relAttribute.toLowerCase()=='jaxbox')){
				anchor.onclick = function () {myLightbox.start(this); return false;}
			}

		}

		var objBody = document.getElementsByTagName("body").item(0);

		var objOverlay = document.createElement("div");
		objOverlay.setAttribute('id','overlay');
		objOverlay.style.display = 'none';
		objOverlay.onclick = function() { myLightbox.end(); return false; }
		objBody.appendChild(objOverlay);

		var objLightbox = document.createElement("div");
		objLightbox.setAttribute('id','lightbox');
		objLightbox.style.display = 'none';
		objBody.appendChild(objLightbox);

		var objOuterImageContainer = document.createElement("div");
		objOuterImageContainer.setAttribute('id','outerImageContainer');
		objLightbox.appendChild(objOuterImageContainer);

		var objImageContainer = document.createElement("div");
		objImageContainer.setAttribute('id','imageContainer');
		objOuterImageContainer.appendChild(objImageContainer);

		var objLightboxImage = document.createElement("img");
		objLightboxImage.setAttribute('id','lightboxImage');
		objImageContainer.appendChild(objLightboxImage);

		var objLightboxPage = document.createElement("div");
		objLightboxPage.setAttribute('id','lightboxPage');
		objImageContainer.appendChild(objLightboxPage);

		var objHoverNav = document.createElement("div");
		objHoverNav.setAttribute('id','hoverNav');
		objImageContainer.appendChild(objHoverNav);

		var objPrevLink = document.createElement("a");
		objPrevLink.setAttribute('id','prevLink');
		objPrevLink.setAttribute('href','#');
		objHoverNav.appendChild(objPrevLink);

		var objNextLink = document.createElement("a");
		objNextLink.setAttribute('id','nextLink');
		objNextLink.setAttribute('href','#');
		objHoverNav.appendChild(objNextLink);

		var objLoading = document.createElement("div");
		objLoading.setAttribute('id','loading');
		objImageContainer.appendChild(objLoading);

		var objLoadingLink = document.createElement("a");
		objLoadingLink.setAttribute('id','loadingLink');
		objLoadingLink.setAttribute('href','#');
		objLoadingLink.onclick = function() { myLightbox.end(); return false; }
		objLoading.appendChild(objLoadingLink);

		var objLoadingImage = document.createElement("img");
		objLoadingImage.setAttribute('src', fileLoadingImage);
		objLoadingLink.appendChild(objLoadingImage);

		var objImageDataContainer = document.createElement("div");
		objImageDataContainer.setAttribute('id','imageDataContainer');
		objImageDataContainer.className = 'clearfix';
		objLightbox.appendChild(objImageDataContainer);

		var objImageData = document.createElement("div");
		objImageData.setAttribute('id','imageData');
		objImageDataContainer.appendChild(objImageData);

		var objImageDetails = document.createElement("div");
		objImageDetails.setAttribute('id','imageDetails');
		objImageData.appendChild(objImageDetails);

		var objCaption = document.createElement("span");
		objCaption.setAttribute('id','caption');
		objImageDetails.appendChild(objCaption);

		var objNumberDisplay = document.createElement("span");
		objNumberDisplay.setAttribute('id','numberDisplay');
		objImageDetails.appendChild(objNumberDisplay);

		var objBottomNav = document.createElement("div");
		objBottomNav.setAttribute('id','bottomNav');
		objBottomNav.className = 'clearfix';
		objImageData.appendChild(objBottomNav);

		var objBottomNavCloseLink = document.createElement("div");
		objBottomNavCloseLink.setAttribute('id','bottomNavClose');
		objBottomNavCloseLink.onclick = function() { myLightbox.end(); return false; }
		objBottomNav.appendChild(objBottomNavCloseLink);

		var objBottomNavOKLink = document.createElement("div");
		objBottomNavOKLink.setAttribute('id','bottomNavOK');
		objBottomNav.appendChild(objBottomNavOKLink);

		var objX = document.createElement("div");
		objX.className = 'clearfix';
		objBottomNav.appendChild(objX);

	},


	positionOverlay: function(){

		var arrayPageSize = getPageSize();
		var arrayScroll = getPageScroll();

		Element.setHeight('overlay', arrayPageSize[1]);
		Element.setTop('overlay', arrayScroll[1]);

	},

	positionMe: function(){

		var arrayPageSize = getPageSize();
		var arrayPageScroll = getPageScroll();

		Element.setTop('lightbox', arrayPageScroll[1] + (arrayPageSize[3] / 15));

	},

	showOverlay: function(){
		hideSelectBoxes();
		this.positionOverlay();
		window.onscroll = function() { myLightbox.positionOverlay(); myLightbox.positionMe(); };
		window.onresize = function() { myLightbox.positionOverlay(); myLightbox.positionMe(); };
		new Effect.Appear('overlay', { duration: 0.15, from: 0.0, to: 0.6 });
	},

	start: function(imageLink,urlForJax) {

		var showImage = false;

		this.showOverlay();

		imageArray = [];
		imageNum = 0;

		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		// fetch html by ajax
		if((imageLink.getAttribute('rel') == 'jaxbox')){

			if(urlForJax!='' && urlForJax!=undefined) {
				imageLink.href = urlForJax;
			}

			var queryString = imageLink.href.replace(/^[^\?]+\??/,'');
			var params = parseQuery( queryString );

			jax_width = (params['width']*1) + 30;
			jax_height = (params['height']*1) + 40;
			ajaxContentW = jax_width - 30;
			ajaxContentH = jax_height - 45;

		// show single image
		} else if((imageLink.getAttribute('rel') == 'lightbox')){
			imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));
			showImage = true;

		// show slideshow
		} else {
			for (var i=0; i<anchors.length; i++){
				var anchor = anchors[i];
				if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel'))){
					imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
				}
			}
			imageArray.removeDuplicates();
			while(imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++;}

			showImage = true;

		}

		this.positionMe();

		if(showImage){
			this.changeImage(imageNum);
			Element.hide('bottomNavOK');
			Element.hide('lightboxPage');

		}else{
			this.showPage(imageLink,jax_width,jax_height);
			Element.show('bottomNavOK');
			Element.show('lightboxPage');
			Element.hide('hoverNav');
		}

		return false
	},

	showMsg: function (msg, width, height) {
		Element.hide('loading');
		Element.hide('lightboxImage');
		Element.hide('bottomNavClose');
		Element.hide('hoverNav');
		Element.show('lightboxPage');
		Element.show('bottomNavOK');
		Element.setWidth('bottomNav',50);

		this.showOverlay();
		this.resizeImageContainer(350,100,true,true);
		this.positionMe();

		$('lightboxPage').innerHTML='<h1>Hinweis</h1><p>'+msg+'</p>';
		$('bottomNavOK').onclick = function() { myLightbox.end(); return false; }

		return false;

	},

	showPage: function (url, width, height) {

		Element.hide('prevLink');
		Element.hide('nextLink');
		Element.hide('hoverNav');
		Element.hide('loading');
		Element.hide('lightboxImage');
		Element.setWidth('bottomNav',165);

		myLightbox.resizeImageContainer(width,height,true,true);

		handler=function(x){

			var ret=ajax_strip(x.responseText).split('||%%||');
			$('bottomNavOK').onclick = function() { eval(ret[2]); return false; };
			$('lightboxPage').innerHTML='<h1>'+ret[0]+'</h1><p>'+ret[1]+'</p>';
		}

		new Ajax.Request(url, {asynchronous:true, method:'post', onSuccess:handler });
	},


	changeImage: function(imageNum) {

		activeImage = imageNum;

		Element.show('lightbox');
		Element.show('loading');
		Element.hide('lightboxImage');
		Element.hide('hoverNav');
		Element.hide('prevLink');
		Element.hide('nextLink');
		Element.hide('imageDataContainer');
		Element.hide('numberDisplay');
		Element.setWidth('bottomNav',120);

		imgPreloader = new Image();

		imgPreloader.onload=function(){
			Element.setSrc('lightboxImage', imageArray[activeImage][0]);
			myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height, false, false);
		}
		imgPreloader.src = imageArray[activeImage][0];
	},


	resizeImageContainer: function( imgWidth, imgHeight, doNotResize, isNoImage ) {

		var _window = Position.Window.size();

		this.wCur = Element.getWidth('outerImageContainer');
		this.hCur = Element.getHeight('outerImageContainer');


		if(!doNotResize){

			originalWidth=imgWidth;
			originalHeight=imgHeight;

			sWidthDiff=_window[0]-(imgWidth+20);
			sHeightDiff=_window[1]-(imgHeight+80);

			if(sWidthDiff<=0 || sHeightDiff<=0){
				if(sWidthDiff<sHeightDiff){
					_newWidth=imgWidth+sWidthDiff;
					_newHeight=(imgHeight)*(_newWidth/imgWidth);
					newHeight=_newHeight-80;
					newWidth=(newHeight/_newHeight)*_newWidth;
				}else{
					_newHeight=imgHeight+sHeightDiff;
					_newWidth=imgWidth*(_newHeight/imgHeight);
					newWidth=_newWidth-20;
					newHeight=(newWidth/_newWidth)*_newHeight;
				}

				$('lightboxImage').style.width=newWidth+'px';
				$('lightboxImage').style.height=newHeight+'px';

				imgResized=true;

				imgWidth=newWidth;
				imgHeight=newHeight;

			}else{

				$('lightboxImage').style.width=imgWidth+'px';
				$('lightboxImage').style.height=imgHeight+'px';
				imgResized=false;

			}

		}else{

			$('lightboxImage').style.width=imgWidth+'px';
			$('lightboxImage').style.height=imgHeight+'px';
			imgResized=false;

		}


		if(!isNoImage){
			this.xScale = ((imgWidth  + (borderSize * 2)) / this.wCur) * 100;
			this.yScale = ((imgHeight  + (borderSize * 2)) / this.hCur) * 100;

			wDiff = (this.wCur - borderSize * 2) - imgWidth;
			hDiff = (this.hCur - borderSize * 2) - imgHeight;

			if(!( hDiff == 0)){ new Effect.Scale('outerImageContainer', this.yScale, {scaleX: false, duration: resizeDuration, queue: 'front'}); }
			if(!( wDiff == 0)){ new Effect.Scale('outerImageContainer', this.xScale, {scaleY: false, delay: resizeDuration, duration: resizeDuration}); }
			if( (hDiff == 0) && (wDiff == 0)) if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } else { pause(100);}

			this.showImage();
		}else{

			Element.setWidth('outerImageContainer',imgWidth+ (borderSize * 2));
			Element.setHeight('outerImageContainer',imgHeight+ (borderSize * 2));
			new Effect.BlindDown('lightbox');

		}

		Element.setHeight('prevLink', imgHeight);
		Element.setHeight('nextLink', imgHeight);
		Element.setWidth('imageDataContainer',imgWidth+(borderSize*2));

	},


	showImage: function(){
		Element.hide('loading');
		new Effect.Appear('lightboxImage', { duration: 0.5, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
		this.preloadNeighborImages();
	},


	updateDetails: function() {

		Element.show('caption');
		Element.setInnerHTML( 'caption', imageArray[activeImage][1]);

		if(imageArray.length > 1){
			Element.show('numberDisplay');
			Element.setInnerHTML( 'numberDisplay', "Bild " + eval(activeImage + 1) + " von " + imageArray.length + ((imgResized)?' &middot; <strong>Bild wird verkleinert dargestellt</strong> &middot; <a href="javascript:void(0);" onclick="myLightbox.resizeImageContainer(originalWidth,originalHeight,true);" >Originalgröße</a>':''));
		}

		new Effect.Parallel(
			[ new Effect.SlideDown( 'imageDataContainer', { sync: true, duration: resizeDuration + 0.25, from: 0.0, to: 1.0 }),
			  new Effect.Appear('imageDataContainer', { sync: true, duration: 1.0 }) ],
			{ duration: 0.65, afterFinish: function() { myLightbox.updateNav();} }
		);
	},

	updateNav: function() {

		Element.show('hoverNav');

		if(activeImage != 0){
			Element.show('prevLink');
			document.getElementById('prevLink').onclick = function() {
				myLightbox.changeImage(activeImage - 1); return false;
			}
		}

		if(activeImage != (imageArray.length - 1)){
			Element.show('nextLink');
			document.getElementById('nextLink').onclick = function() {
				myLightbox.changeImage(activeImage + 1); return false;
			}
		}

		this.enableKeyboardNav();
	},

	enableKeyboardNav: function() {
		document.onkeydown = this.keyboardAction;
	},

	disableKeyboardNav: function() {
		document.onkeydown = '';
	},

	keyboardAction: function(e) {
		if (e == null) {
			keycode = event.keyCode;
		} else {
			keycode = e.which;
		}

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

		if((key == 'x') || (key == 'o') || (key == 'c')){
			myLightbox.end();
		} else if(key == 'p'){
			if(activeImage != 0){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage - 1);
			}
		} else if(key == 'n'){
			if(activeImage != (imageArray.length - 1)){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage + 1);
			}
		}


	},

	preloadNeighborImages: function(){

		if((imageArray.length - 1) > activeImage){
			preloadNextImage = new Image();
			preloadNextImage.src = imageArray[activeImage + 1][0];
		}
		if(activeImage > 0){
			preloadPrevImage = new Image();
			preloadPrevImage.src = imageArray[activeImage - 1][0];
		}

	},

	end: function() {
		this.disableKeyboardNav();
		Element.hide('lightbox');
		$('lightboxPage').innerHTML='';
		new Effect.Fade('overlay', { duration: 0.2});
		showSelectBoxes();
		window.onscroll = function() { };
		window.onresize = function() { };
	}
}

function parseQuery ( query ) {
   var Params = new Object ();
   if ( ! query ) return Params;
   var Pairs = query.split(/[;&]/);
   for ( var i = 0; i < Pairs.length; i++ ) {
      var KeyVal = Pairs[i].split('=');
      if ( ! KeyVal || KeyVal.length != 2 ) continue;
      var key = unescape( KeyVal[0] );
      var val = unescape( KeyVal[1] );
      val = val.replace(/\+/g, ' ');
      Params[key] = val;
   }
   return Params;
}

function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll)
	return arrayPageScroll;
}

function getKey(e){
	if (e == null) {
		keycode = event.keyCode;
	} else {
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();

	if(key == 'x'){
	}
}

function listenKey () {	document.onkeypress = getKey; }

function showSelectBoxes(){
	selects = document.getElementsByTagName("select");
	objects = document.getElementsByTagName("object");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}
	for (i = 0; i != objects.length; i++) {
		objects[i].style.visibility = "visible";
	}
}

function hideSelectBoxes(){
	selects = document.getElementsByTagName("select");
	objects = document.getElementsByTagName("object");
	for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "hidden";
	}
	for (i = 0; i != objects.length; i++) {
		objects[i].style.visibility = "hidden";
	}
}

function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

function initLightbox() { myLightbox = new Lightbox(); }
Event.observe(window, 'load', initLightbox, false);