var g_isSlideshowRunning = false;
var g_slideshowTimer;
//var g_slideshowTimeout;
var g_tabCurrent;
var g_imgCurrent;
var g_tabBegin;
var g_tabPrev;
var g_tabNext;
var g_tabEnd;
var g_imgBegin;
var g_imgPrev;
var g_imgNext;
var g_imgEnd;	
var g_slideSrc;
var g_slideWidth;
var g_slideHeight;
var g_slideCaption;
var g_slideNr;
var g_slideCount;
var g_showAtOnce;
var g_bigFileName;
var g_unid;
var g_isNextImageLoaded;  //true, when image is loaded, false, otherwise, is set by preloader image

function getCachePreventTime() {
	var now = new Date();
	return "&rand=" + now.getTime() + escape( Math.round( Math.random() * 10000 ) );
}

function getNodeValue(obj, tag) {
	if (obj.getElementsByTagName(tag)[0].firstChild)
		return obj.getElementsByTagName(tag)[0].firstChild.nodeValue;
	else
		return " ";
}


//is set by preloader image, when it is loaded, with onload
function setNextImageIsLoaded() {
	//debugAppend('fertig: ' + document.getElementById("galleryimage").src);
	g_isNextImageLoaded = true;


}


//Ajax 
var xmlHttp = null;
function createXMLHttpRequest() { 
	if (xmlHttp) xmlHttp.abort();
	xmlHttp = null;
	/*if (window.ActiveXObject) { 	
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 
	}
	else if (window.XMLHttpRequest) { 

		xmlHttp = new XMLHttpRequest(); 
	}

	var req = false;*/

	if(window.XMLHttpRequest){
		xmlHttp = new XMLHttpRequest();

		if(xmlHttp.overrideMimeType){ xmlHttp.overrideMimeType('text/xml'); }
	} 
	else if(window.ActiveXObject){
		try{ xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); }
		catch(e){
			try{ xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); }
			catch(e){}
		}
	}
}



function openImageGalleryEntry(tabNr, imgNr) {
	g_tabCurrent = tabNr;
	g_imgCurrent = imgNr;
	var docURL = document.URL;
	var pos = docURL.indexOf("?OpenDocument");
	if(pos != "-1") {
		docURL = docURL.substring(0, pos);
	}
	var entryURL = replStr(docURL, "/web/", "/webimagegalleryentryxml/") + "?OpenDocument&tab=" + tabNr + "&img=" + imgNr;

	getGalleryEntryXML(entryURL);
}


var incarnationCounter = 0;
//open gallery entry for next image, when current one is loaded
function openImageGalleryEntryWhenLoaded(tabNr, imgNr) {
	//debug("jetzt warten");
	if (!g_isNextImageLoaded) {
		//debugAppend("imgNr: " + String(incarnationCounter++));
		//give image some time load
		window.setTimeout("openImageGalleryEntryWhenLoaded(" + tabNr + ", " + imgNr + ")", 100);	
	}
	else {
		//debug("jetzt ist es da!");
		openImageGalleryEntry(tabNr, imgNr);
	}
}



function getGalleryEntryXML(url) {		
	createXMLHttpRequest();		
	if (!xmlHttp) {
		//showIndeterminate();
	}
	else {
		xmlHttp.onreadystatechange = showGalleryEntryXML;
		xmlHttp.open("GET", url + getCachePreventTime(), true);
		xmlHttp.send(null);
	}
}


//is called when xmlhttprequest sends result
function showGalleryEntryXML() {
	var html = "";	
	var status;
	if (xmlHttp.readyState == 4) {	
		try {      //firefox sometimes throws errors     
			status = xmlHttp.status;
		}
		catch (e) {
			status = 404;
			/*alert("Network error!\nPlease try later.");
            try {
            alert("Failure: " +  + xmlHttp.statusText);
            }
            catch(e) {}*/
		}

		//result is there
		if (status == 200) {     

			var response = xmlHttp.responseXML.documentElement;

			g_tabBegin = getNodeValue(response, "tabbegin");
			g_tabPrev = getNodeValue(response, "tabprev");
			g_tabNext = getNodeValue(response, "tabnext");
			g_tabEnd = getNodeValue(response, "tabend");
			g_imgBegin = getNodeValue(response, "imgbegin");
			g_imgPrev = getNodeValue(response, "imgprev");
			g_imgNext = getNodeValue(response, "imgnext");
			g_imgEnd = getNodeValue(response, "imgend");						

			g_slideSrc = getNodeValue(response, "src"); 
			g_slideWidth = parseInt(getNodeValue(response, "width")); 
			g_slideHeight = parseInt(getNodeValue(response, "height")),
			g_slideCaption = getNodeValue(response, "caption"),
			g_slideNr = getNodeValue(response, "nr"), 
			g_slideCount = getNodeValue(response, "count")			

			g_bigFileName = getNodeValue(response, "bigfilename"); 
			g_unid = getNodeValue(response, "unid"); 

			//preloading images for slideshow
			g_isNextImageLoaded = false;
			document.getElementById("imagepreloader").src = g_slideSrc;


			if (g_isSlideshowRunning) {
				if (g_showAtOnce) {
					//called from page, not div, don't wait for image to show
					g_showAtOnce = false;
					showGalleryEntryAjax();
				}
				else {						
					g_slideshowTimer = window.setTimeout("showGalleryEntryAjax()", g_slideshowTimeout);												
				}
			}
			else {
				showGalleryEntryAjax();
			}						
		}		
	}
}


//show gallery entry, information is provided in global variables
function showGalleryEntryAjax() {	
	//g_slideWidth = 640;
	//g_slideHeight = 600;

	g_slideWidth = g_maximumImageWidth;
	g_slideHeight = g_maximumImageHeight;


	var shadeborder = 8;
	var divWidth = g_slideWidth + 7;  //38;



	//var divHeight = height + 20;
	var divHeight = g_slideHeight + 72;  //space below image
	// magic numbers follow, do not try at home
	//var popupWidth = divWidth;
	//var popupHeight = divHeight - 36;
	var shadeWidth = divWidth + 23;   //56;
	var shadeHeight = divHeight + 69;

	/*	if (screen.width <= 800) {
     	divHeight = 300;
          popupHeight = 276;
          shadeHeight = 353;
	}*/


	//showLr("divContent");
	//showLr("divContentShade");

	//var elmShade = document.getElementById("divContentShade");
	var elmPopup = document.getElementById("divLayer");
	var elmContent = document.getElementById("divLayerContent");
	var elmOverlay = document.getElementById('pageoverlay');

	var divX = g_pageWidth / 2 - divWidth / 2;
	//var divY = Math.round( (viewportGetHeight() - divHeight) / 2 ) + viewportGetScrollY();
	var divAllHeight = (g_slideHeight + 127);
	var divY = Math.round( (viewportGetHeight() - divAllHeight + viewportGetScrollY()) / 2);  //107 = space below image + padding-top to image
	//debug("divY: " + String(divY));
	if (divX < 0) { divX = 0; }
	if (divY < 0) { divY = 0; }

	/*elmShade.style.left = (divX - shadeborder) + "px";
	elmShade.style.top = (divY - shadeborder) + "px";
	elmShade.style.width = shadeWidth + "px";
	elmShade.style.height = shadeHeight + "px";*/

	elmPopup.style.left = divX + "px";
	elmPopup.style.top = divY + "px";
	elmPopup.style.width = divWidth + "px";
	elmPopup.style.height = divHeight + "px";
	elmContent.style.width = g_slideWidth + "px";
	elmContent.style.height = g_slideHeight + "px";
	document.getElementById("divLayerTitle").style.width = (g_slideWidth - 1) + "px";
	document.getElementById("closeButtonDivLayer").style.left = (g_slideWidth - 7) + "px";

	//document.getElementById("popupDivTitle").innerHTML = "<img src=\"" + layerTitleImg + "\" alt=\"" + layerTitle + "\">";


	//g_openpopupDiv = sUrl;

	document.getElementById("galleryimage").src = document.getElementById("imagepreloader").src; //g_slideSrc;
	//document.getElementById("galleryimage").style.width = String(g_slideWidth) + "px";
	//document.getElementById("galleryimage").style.height = String(g_slideHeight) + "px";
	//document.getElementById("gallerytable").style.width = String(g_slideWidth + 2) + "px";
	//document.getElementById("gallerytableinfo").style.width = String(g_slideWidth + 2) + "px";
	//document.getElementById("gallerysp").style.width = String(g_slideWidth - 138) + "px";	
	document.getElementById("gallerycaption").innerHTML = g_slideCaption;
	document.getElementById("gallerynrofcount").innerHTML = "(" + g_slideNr + "/" + g_slideCount + ")";
	if (g_imgBegin == "-1") document.getElementById("gallerybegin").style.visibility = "hidden";
	else document.getElementById("gallerybegin").style.visibility = "visible";
	if (g_imgPrev == "-1") document.getElementById("galleryprev").style.visibility = "hidden";
	else document.getElementById("galleryprev").style.visibility = "visible";
	if (g_imgNext == "-1") document.getElementById("gallerynext").style.visibility = "hidden";
	else document.getElementById("gallerynext").style.visibility = "visible";
	if (g_imgEnd == "-1") document.getElementById("galleryend").style.visibility = "hidden";
	else document.getElementById("galleryend").style.visibility = "visible";
	if (g_imgNext == "-1") document.getElementById("startstop").src = "/icons/ecblank.gif";
	else document.getElementById("startstop").src = g_startStopLabel;


	elmOverlay.style.display = "block";	
	elmPopup.style.display = "block";
	//elmShade.style.display = "block";
	elmContent.style.display = "block";

	//debug("g_slideSrc: " + g_slideSrc);
	//debugAppend("g_isNextImageLoaded: " + String(g_isNextImageLoaded));

	if (g_isSlideshowRunning) {
		if(g_imgNext != "-1") {		
			//if slideshow is running and current image is not the last in the slideshow open the next one

			//if current image is already loaded, get the next one	
			if (g_isNextImageLoaded) {		
				//debugAppend("weiter");
				openImageGalleryEntry(g_tabNext, g_imgNext);							
			}
			else {
				//debugAppend("warten!!!!!!");
				openImageGalleryEntryWhenLoaded(g_tabNext, g_imgNext)
			}

		}
		else {
			//no more images, stop slideshow, so it is also stopped when jumped to another entry
			g_startStopLabel = g_startLabel;		
			g_isSlideshowRunning = !g_isSlideshowRunning;
		}
	}

}




function galleryGoto(dest) {
	stopSlideshow();
	switch (dest) {
	case "begin":
		tabNr = g_tabBegin;
		imgNr = g_imgBegin;
		break;
	case "prev":
		tabNr = g_tabPrev;
		imgNr = g_imgPrev;
		break;
	case "next":
		tabNr = g_tabNext;
		imgNr = g_imgNext;
		break;
	case "end":
		tabNr = g_tabEnd;
		imgNr = g_imgEnd;
		break;
	}	
	openImageGalleryEntry(tabNr, imgNr);
}

function stopSlideshow() {
	if(g_isSlideshowRunning) {
		window.clearTimeout(g_slideshowTimer);
		xmlHttp.abort();
		g_startStopLabel = g_startLabel;			
		document.getElementById("startstop").src = g_startLabel;
		g_isSlideshowRunning = false;
	}		
}

function startStopSlideshow() {
	if(g_isSlideshowRunning) {
		window.clearTimeout(g_slideshowTimer);
		xmlHttp.abort();
		g_startStopLabel = g_startLabel;			
	}
	else {		
		openImageGalleryEntry(g_tabNext, g_imgNext);				
		g_startStopLabel = g_stopLabel;		
	}
	document.getElementById("startstop").src = g_startStopLabel;
	g_isSlideshowRunning = !g_isSlideshowRunning;
}

//is called from page not div
function startSlideshow() {
	g_showAtOnce = true;
	g_isSlideshowRunning = true;
	g_startStopLabel = g_stopLabel;
	openImageGalleryEntry(1, 1);
}


function openGalleryEntryPrint() {
	openGalleryEntryPrintWindow(g_tabCurrent, g_imgCurrent);
}

function openGalleryEntryPrintWindow(tabNr, imgNr) {
	var docURL = document.URL;
	var pos = docURL.indexOf("?OpenDocument");
	if(pos != "-1") {
		docURL = docURL.substring(0, pos);
	}
	var entryURL = replStr(docURL, "/web/", "/webimagegalleryentryprint/") + "?OpenDocument&tab=" + tabNr + "&img=" + imgNr;	
	var width = 640;
	var height = 480;
	var windowWidth =  width + 30;
	var windowHeight = height + 130;
	var windowX = (screen.width - windowWidth) / 2;
	var windowY = (screen.height - windowHeight) / 2;
	var parameters = "width=" + windowWidth + ", height=" + windowHeight + ", left=" + windowX + ", top=" + windowY + ", location=no, status=no, toolbar=no, menubar=no, dependent=yes";
	var entryWindow = window.open(entryURL, "entry", parameters);
	if (entryWindow) entryWindow.focus();		
}


function downloadOriginalImage() {
	var docURL = document.URL;	
	var dbPath = leftStr(rightStr(rightStr(docURL, "http://"), "/"), ".nsf") + ".nsf";
	document.location.href = "/servlet/GetNotesAttachment?unid=" + g_unid + "&filename=" + g_bigFileName + "&dbpath=" + dbPath;
}