// -----------------------------------------------------------------------------------
//
//	Lightbox v2.02
//	by Lokesh Dhakar - http://www.huddletogether.com
//	3/31/06
//	modified by Peter Quiel - http://www.pq-solutions.de
//
//	For more information on this script, visit:
//	http://huddletogether.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//
//	Credit also due to those who have helped, inspired, and made their code available to the public.
//	Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.org), Thomas Fuchs(mir.aculo.us), and others.
//
//
// -----------------------------------------------------------------------------------

var borderSize = 10;	//if you adjust the padding in the CSS, you will need to update this variable
var activeImage;

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;
	}
});

// -----------------------------------------------------------------------------------

//
//	Extending built-in Array object
//	- array.removeDuplicates()
//	- array.empty()
//
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();
	}
}

// -----------------------------------------------------------------------------------

//
//	Lightbox Class Declaration
//	- initialize()
//	- start()
//	- changeImage()
//	- resizeImageContainer()
//	- showImage()
//	- updateDetails()
//	- updateNav()
//	- enableKeyboardNav()
//	- disableKeyboardNav()
//	- keyboardNavAction()
//	- preloadNeighborImages()
//	- end()
//
//	Structuring of code inspired by Scott Upton (http://www.uptonic.com/)
//
var Lightbox = Class.create();

Lightbox.prototype = {

	// initialize()
	// Constructor runs on completion of the DOM loading. Loops through anchor tags looking for
	// 'lightbox' references and applies onclick events to appropriate links. The 2nd section of
	// the function inserts html at the bottom of the page which is used to display the shadow
	// overlay and the image container.
	//
	initialize: function() {
		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');

		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 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 objImageDataContainerCont = document.createElement("div");
		objImageDataContainerCont.setAttribute('id','imageDataContainerCont');
		objImageDataContainerCont.className = 'clearfix';
		objLightbox.appendChild(objImageDataContainerCont);

		var objImageDataContainer = document.createElement("div");
		objImageDataContainer.setAttribute('id','imageDataContainer');
		objImageDataContainer.className = 'clearfix';
		objImageDataContainerCont.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("div");
		objCaption.setAttribute('id','caption');
		objImageDetails.appendChild(objCaption);

		var objNumberDisplay = document.createElement("div");
		objNumberDisplay.setAttribute('id','numberDisplay');
		objNumberDisplay.setAttribute('class','left');
		objImageDetails.appendChild(objNumberDisplay);
		
		/*
		var objDropDownSelectDiv = document.createElement("div");
		objDropDownSelectDiv.setAttribute('id','dropdownselectdiv');
		objImageDetails.appendChild(objDropDownSelectDiv);
*/


		if (dropDownSelect == 1){
			if ($('picture_gallery_dropdown').options.length > 0){
				var objDropDownSelect = document.createElement('select');
				objDropDownSelect.setAttribute('id','dropdownselect');
				objDropDownSelect.setAttribute('class','right');
				
				for(var index=0; index<$('picture_gallery_dropdown').options.length; index++) {
					var option = document.createElement ('option');
					option.value = $('picture_gallery_dropdown').options[index].value;
					option.text  = $('picture_gallery_dropdown').options[index].text;
	  				if (document.all){
		 				objDropDownSelect.add( option, index );
	  				} else {
	  					objDropDownSelect.add( option, null );
	  				}
				}
				//objDropDownSelect.options = $('picture_gallery_dropdown').options;
				objDropDownSelect.onchange = function () {
					if (objDropDownSelect.options[ objDropDownSelect.selectedIndex].value  != -1){
						myLightbox.changeImage ( objDropDownSelect.options[ objDropDownSelect.selectedIndex].value);
					}
					return false;
				}
				objImageDetails.appendChild(objDropDownSelect);
			}
		}
		
		var objClear = document.createElement("div");
		objClear.setAttribute('class','clear');
		objImageDetails.appendChild(objClear);

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

		var objBottomPlayLink = document.createElement("a");
		objBottomPlayLink.setAttribute('class','bottomNavLink');
		objBottomPlayLink.setAttribute('href','#');
		objBottomPlayLink.onclick = function() { myLightbox.play(); return false; }
		objBottomNav.appendChild(objBottomPlayLink);

		this.objBottomNavPlayImage = document.createElement("img");
		this.objBottomNavPlayImage.setAttribute('src', filePlayButton);
		this.objBottomNavPlayImage.setAttribute('alt', filePlayButton_alt);
		objBottomPlayLink.appendChild(this.objBottomNavPlayImage);

		var objBottomNavCloseLink = document.createElement("a");
		objBottomNavCloseLink.setAttribute('class','bottomNavLink');
		objBottomNavCloseLink.setAttribute('href','#');
		objBottomNavCloseLink.onclick = function() { myLightbox.end(); return false; }
		objBottomNav.appendChild(objBottomNavCloseLink);


		var objBottomNavCloseImage = document.createElement("img");
		objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
		objBottomNavCloseImage.setAttribute('alt', fileBottomNavCloseImage_alt);
		objBottomNavCloseLink.appendChild(objBottomNavCloseImage);

		this.diashow = false;

	},

	startGalleryByDropDown: function () {
		var selectedImage = $('picture_gallery_dropdown').options[$('picture_gallery_dropdown').selectedIndex ].value;
		if (selectedImage !=-1){
			this.start(selectedImage);
		}
	},
	//
	//	start()
	//	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
	//
	start: function(startImage ) {

		startImage = (startImage == null) ? 0 : startImage;
		
		//hideSelectBoxes();

		//Element.hide('imageDataContainerCont');

		// stretch overlay to fill page and fade in
		var arrayPageSize = getPageSize();
		Element.setHeight('overlay', arrayPageSize[1]);
		new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: 0.8 });

		// calculate top offset for the lightbox and display
		var arrayPageSize = getPageSize();
		var arrayPageScroll = getPageScroll();
		var lightboxTop = arrayPageScroll[1] + 10; //+ (arrayPageSize[3] / 15);

		Element.setTop('lightbox', lightboxTop);
		Element.show('lightbox');

		this.changeImage(startImage);
	},

	play: function() {
		if (this.diashow){
			this.objBottomNavPlayImage.setAttribute('src', filePlayButton);
			this.objBottomNavPlayImage.setAttribute('alt', filePlayButton_alt);
			this.diashow = false;
			window.clearInterval(this.intervalID);
			this.updateDetails();
		} else {
			this.objBottomNavPlayImage.setAttribute('src', filePauseButton);
			this.objBottomNavPlayImage.setAttribute('alt', filePauseButton_alt);
			this.diashow = true;
			showNextImage();
			// diashowDuration wird von einem externen Script definiert
			this.intervalID = window.setInterval(showNextImage, diashowDuration);
		}
	},
	//
	//	changeImage()
	//	Hide most elements and preload image in preparation for resizing image container.
	//
	changeImage: function(imageNum) {

		activeImage = imageNum;	// update global var

		// hide elements during transition
		Element.show('loading');
		Element.hide('lightboxImage');
		Element.hide('hoverNav');
		Element.hide('prevLink');
		Element.hide('nextLink');
		Element.hide('imageDataContainer');
		Element.hide('numberDisplay');
		//Element.hide('dropdownselect');

		imgPreloader = new Image();

		// once image is preloaded, resize image container
		imgPreloader.onload=function(){
			Element.setSrc('lightboxImage', imageArray[activeImage][0]);
			var xsize = (imgPreloader.width < 600) ? 600 : 600;
			myLightbox.resizeImageContainer(xsize, imgPreloader.height);
		}
		imgPreloader.src = imageArray[activeImage][0];
	},

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

		// get current height and width
		this.wCur = Element.getWidth('outerImageContainer');
		this.hCur = Element.getHeight('outerImageContainer');

		// scalars based on change from old to new
		this.xScale = ((imgWidth  + (borderSize * 2)) / this.wCur) * 100;
		this.yScale = ((imgHeight  + (borderSize * 2)) / this.hCur) * 100;

		// calculate size difference between new and old image, and resize if necessary
		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});
			new Effect.Scale('imageDataContainerCont', this.xScale, {scaleY: false, delay: resizeDuration, duration: resizeDuration});
		}

		// if new and old image are same size and no scaling transition is necessary,
		// do a quick pause to prevent image flicker.
		if((hDiff == 0) && (wDiff == 0)){
			if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } else { pause(100);}
		}

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

		this.showImage();
	},

	//
	//	showImage()
	//	Display image and begin preloading neighbors.
	//
	showImage: function(){
		Element.hide('loading');
		new Effect.Appear('lightboxImage', { duration: 0.5, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
		this.preloadNeighborImages();
	},

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

	  Element.show('caption');

      newCapArray = [];
	  var start = 0;
	  var end = 5;


	  if (imageArray.length > 5 && activeImage > 2 ) {
		start = activeImage - 2;
		end   = activeImage + 3;
		if ( end > imageArray.length){
			start -= end - imageArray.length;
			end = imageArray.length;
		}
	  } else if (imageArray.length < 5) {
	  	end = imageArray.length;
	  }

	  var left = activeImage - 4;
	  left = (left < 0) ? 0 : left;
	  var right = activeImage + 4;
	  right = (right >= imageArray.length) ? imageArray.length - 1 : right;

	  if ( activeImage > 3 &&  ! this.diashow){
		newCapArray.push('<a class="jumpLink" href="#" onClick="myLightbox.changeImage(' + left + '); return false;"><img src="' + fileRewindButton + '" alt="' + fileRewindButton_alt + '" /></a>');
	  } else {
		newCapArray.push('<a class="jumpLink" href="#" onClick="return false;"><img src="' + fileDummyImage + '" /></a>');
      }

      for(var i = start; i < end; i++){
        if( i == activeImage){
          newCap = '<div class="presentationmodeDiv presentationmodeAct"><img src="' + imageArray[i][1]+ '" /></div>';
        } else {
          newCap = '<div class="presentationmodeDiv"><a href="#" id="'+i+'" onClick="myLightbox.changeImage('+(i)+'); return false;"><img src="' + imageArray[i][1]+ '" /></a></div>';
        }

        newCapArray.push(newCap);
		if ( (i+1) != end) {
		    newCapArray.push('<div class="presentationmodeVR"></div>');
		}
      }

	  if ( activeImage + 3 < imageArray.length  &&  ! this.diashow ){
		newCapArray.push('<a class="jumpLink" href="#" onClick="myLightbox.changeImage(' + right + '); return false;"><img src="' + fileForwardButton + '"  alt="' + fileForwardButton_alt + '" /></a>');
	  } else {
		newCapArray.push('<a class="jumpLink" href="#" onClick="return false;"><img src="' + fileDummyImage + '" /></a>');
      }

      Element.setInnerHTML( 'caption', newCapArray.join(" "));

		Element.show('numberDisplay');
		//Element.show('dropdownselect');
	
		var description =  numberDisplayLabelFirst+" " + eval(activeImage + 1) + " "+numberDisplayLabelLast+" " + imageArray.length;
		if (imageArray[activeImage][2] != ''){
			description += ': ' + imageArray[activeImage][2];
		}
		Element.setInnerHTML( 'numberDisplay', description);

    	new Effect.Appear('imageDataContainer', {duration: 1.0 ,  afterFinish: function() { myLightbox.updateNav(); }});
		/*
		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()
	//	Display appropriate previous and next hover navigation.
	//
	updateNav: function() {

		Element.show('hoverNav');

		// if not first image in set, display prev image button
		if(activeImage != 0 && ! this.diashow){
			Element.show('prevLink');
			document.getElementById('prevLink').onclick = function() {
				myLightbox.changeImage(activeImage - 1); return false;
			}
		}

		// if not last image in set, display next image button
		if(activeImage != (imageArray.length - 1) && ! this.diashow){
			Element.show('nextLink');
			document.getElementById('nextLink').onclick = function() {
				myLightbox.changeImage(activeImage + 1); return false;
			}
		}

		this.enableKeyboardNav();
	},

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

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

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

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

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


	},

	//
	//	preloadNeighborImages()
	//	Preload previous and next images.
	//
	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()
	//
	end: function() {
		this.disableKeyboardNav();
		Element.hide('lightbox');
		new Effect.Fade('overlay', { duration: 0.2});
		showSelectBoxes();
		if(this.diashow){
			this.play();
		}
		activeImage = 0;
	}
}

// -----------------------------------------------------------------------------------

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

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

// -----------------------------------------------------------------------------------

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){

	var xScroll, yScroll;

	if (window.innerHeight && window.scrollMaxY) {
		xScroll = document.body.scrollWidth;
		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
		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 = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
	return arrayPageSize;
}

// -----------------------------------------------------------------------------------

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//
function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();

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

// -----------------------------------------------------------------------------------

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

// ---------------------------------------------------

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

// ---------------------------------------------------

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

// ---------------------------------------------------

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}




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

function showNextImage() {

		activeImage += 1;
		if (activeImage >= imageArray.length){
			activeImage = 0;
		}
		myLightbox.changeImage(activeImage);
}