var currentDir = "/";
var rootDir = "/";
var listElements;
var numberOfSelectedRows = 0;
var username = "notaname";
var password = "password";

function relativePath(path) {
 if (path.startsWith("/"))
  return path.substr(1);
 else
  return path;
}

function absolutePath(path) {
 var result = rootDir + "/" + relativePath(path);

 if (rootDir.startsWith("//")) {
  rootDir = rootDir.substr(1);
 }

 if (rootDir != "/" && rootDir.endsWith("/")) {
  rootDir = rootDir.substr(0, rootDir.length - 1);
 }

 return result;
}

function setRootDir(dir) {
 rootDir = dir;
}

function clearContents() {
	var result = "<table class=\"list\">";
	// empty list
	result += "</table>"
	
	var listElement = document.getElementById("list");

	listElement.innerHTML = result;
}

function loadContents(dir) {
	numberOfSelectedRows = 0;

	var xhr = new XMLHttpRequest();

	xhr.onreadystatechange = function() {
		if (this.readyState != 4 || this.status != 200) {
			return;
		}

		var list = xhr.responseXML;
		listElements = list.getElementsByTagName("listentry");
		
		var result = "<div class=\"fullwidth tooltip\"><table class=\"list\">";

		if (listElements.length == 0) {
			result += "<tr><td class=\"type\"></td><td class=\"name\">(empty)</td></tr>";
		} else {
			for (var i = 0; i < listElements.length; i++) {
				var type = listElements[i].getAttribute("type");
				var filename = listElements[i].textContent;
				var mouse_click =
					"onclick=\"entryMouse('" + filename + "')\"";
				
				var full_path = currentDir + "/" + filename;
				if (full_path.substr(0, 2) == "//") {
					full_path = full_path.substr(1);
				}

				var name_td;
				if (type == "file") {
					type = "<img src=\"webbox-html/file.png\"/>";

					// Difference between HTTP Auth version (with login authorization) and plain version:
					// HTTP Auth: download via onclick() of element. This automatically includes the HTTP auth for the download.
					// Plain: download via generated link which can be used universally.
					if (username == "notaname") { // plain version
						name_td = "<td><a href=\"" + absolutePath(full_path) + "\"><div class=\"name\">" + filename + "</div></a></td>";
					} else { // http auth version
						name_td = "<td class=\"name\" " + mouse_click + ">" + filename + "</td>";
					}
				} else if (type == "dir") {
					type = "<img src=\"webbox-html/directory.png\"/>";
					name_td = "<td class=\"name\" " + mouse_click + ">" + filename + "</td>";
				} else {
					type = "";
				}

                                var selector = "<td class=\"selector\"";
				if (filename != "..") {
					selector += " onclick=\"toggleSelection('" + filename + "')\"><img src=\"webbox-html/checkbox.png\"/><img src=\"webbox-html/checkbox-checked.png\" hidden/";
				}
				selector += "></td>";

				result += "<tr>" +
					selector +
					"<td class=\"type\" " + mouse_click + ">" + type + "</td>" +
					name_td +
					"</tr>";
			}
		}

		result += "</table></div>"

		var listElement = document.getElementById("list");

		listElement.innerHTML = result;

	}

	xhr.open("GET", absolutePath(dir) + "?command=list", true);
	xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
	xhr.send();
}

// return list of file names
function getFileList() {
	var result = [];

	for (var i = 0; i < listElements.length; i++) {
		result.push(listElements[i].childNodes[0].nodeValue);
	}

	return result;
}

function getFileType(filename) {
	for (var i = 0; i < listElements.length; i++) {
		if (listElements[i].childNodes[0].nodeValue == filename) {
			return listElements[i].getAttribute("type");
		}
	}
	return "";
}

function getRow(filename) {
	var list = document.getElementById("list");
	var rows = list.getElementsByTagName("tr");

	for (var i = 0; i < rows.length; i++) {
		var nameElement = rows[i].getElementsByClassName("name")[0];
		if (nameElement.childNodes[0].nodeValue == filename) {
			return rows[i];
		}
	}
	return "";
}

// return list of files
function getSelectedFiles() {
	var result = [];
	var list = document.getElementById("list");
	var rows = list.getElementsByTagName("tr");

	for (var i = 0; i < rows.length; i++) {
		if (rows[i].classList.contains("selectedrow")) {
			result.push(rows[i].getElementsByClassName("name")[0].childNodes[0].nodeValue);
		}
	}

	return result;
}

function getSelection(filename) {
	var row = getRow(filename);

	if (row.classList.contains("selectedrow")) {
		return true;
	}
	return false;
}

function clearSelector(element) {
	element.childNodes[0].style.display = 'block';
	element.childNodes[1].style.display = 'none';
}

function setSelector(element) {
	element.childNodes[0].style.display = 'none';
	element.childNodes[1].style.display = 'block';
}

function clearSelection(filename) {
	var row = getRow(filename);

	if (row.classList.contains("selectedrow")) {
		row.classList.remove("selectedrow");
		numberOfSelectedRows--;
	}
	
	var selectorElement = row.getElementsByClassName("selector")[0];
	clearSelector(selectorElement);
}

function setSelection(filename) {
	if (filename == "..") { // don't select ".."
		return;
	}

	var row = getRow(filename);

	if (!row.classList.contains("selectedrow")) {
		row.classList.add("selectedrow");
		numberOfSelectedRows++;
	}
	
	var selectorElement = row.getElementsByClassName("selector")[0];
	setSelector(selectorElement);
}

function toggleSelection(filename) {
	if (filename == "..") { // don't select ".."
		return;
	}

	var row = getRow(filename);

	var selectorElement = row.getElementsByClassName("selector")[0];

	if (row.classList.contains("selectedrow")) {
		row.classList.remove("selectedrow");
		numberOfSelectedRows--;
	        clearSelector(selectorElement);
	} else {
		row.classList.add("selectedrow");
		numberOfSelectedRows++;
	        setSelector(selectorElement);
	}
}

function entryMouse(filename) {
	var type = getFileType(filename);
	if (type == "file") {
		download(filename);
	} else if (type == "dir") {
		if (filename == "..") {
			if (!currentDir.includes("/")) {
				// error: this shouldn't happen
				alert("Bad path " + currentDir + " for " + filename);
				return;
			}
			currentDir = currentDir.substr(0, currentDir.lastIndexOf("/"));

			if (currentDir == "") {
				currentDir = "/";
			}

			setCurrentDir(currentDir);
			return;
		}

		if (!currentDir.endsWith("/")) {
			currentDir += "/";
		}
		setCurrentDir(currentDir + filename);
	}
}

function showDialog() {
	document.getElementById("greyout").style.display = 'block';
	document.getElementById("dialogwindow").style.display = 'block';
	document.getElementById("okbutton").focus();
}

function hideDialog() {
	document.getElementById("greyout").style.display = 'none';
	document.getElementById("dialogwindow").style.display = 'none';
}

function showMenu() {
	document.getElementById("greyout").style.display = 'block';
	document.getElementById("menuwindow").style.display = 'block';
}

function hideMenu() {
	document.getElementById("greyout").style.display = 'none';
	document.getElementById("menuwindow").style.display = 'none';
}

// if readOnly = "1", disable respective controls since this setting is global and constant
function prepareReadOnly(readOnly) {
	if (readOnly == "1") {
		var writecommands = document.getElementsByClassName("writecommand");
		for (var i = 0; i < writecommands.length; i++) {
			writecommands[i].style.display = "none";
		}
	}
}

function login(title) {
	showDialog();

	document.getElementById("okbutton").onclick = function() {
		// restore dialog buttons
		document.getElementById("cancelbutton").style.display = "block";
		document.getElementById("okbutton").childNodes[0].nodeValue = "OK";
		hideDialog();

		username = document.getElementById("loginusername").value;
		password = document.getElementById("loginpassword").value;
		
		initMainpage();
	}

	// rearrange dialog buttons
	document.getElementById("cancelbutton").style.display = "none";
	document.getElementById("okbutton").childNodes[0].nodeValue = "Login";
	
	document.getElementById("dialog").innerHTML = document.getElementById("login-dialog").innerHTML;
	
	document.getElementById("logintitle").childNodes[0].nodeValue = title;
	
	document.getElementById("loginusername").focus();

	document.getElementById("loginusername").onkeydown = function(evt) {
		if (evt.key == "Enter") {
			document.getElementById("okbutton").click();
		}
	}
	
	document.getElementById("loginpassword").onkeydown = function(evt) {
		if (evt.key == "Enter") {
			document.getElementById("okbutton").click();
		}
	}
}

function initMainpage() {
	// load title
	var xhrTitle = new XMLHttpRequest();

	xhrTitle.onreadystatechange = function() {
		if (this.readyState != 4) {
			return;
		}
		if (this.status == 401) { // login error: goto login page
			var title = "Webbox Login";

			// enable logout function if logging in
			document.getElementById("logoutcommand").style.display = "table-row";

			login(title);
			return;
		} else
		if (this.status != 200) {
			document.getElementsByClassName("title")[0].innerHTML = "HTTP error";
			return;
		}

		var serverInfo = xhrTitle.responseXML;
		var title = serverInfo.getElementsByTagName("title")[0].textContent;
		document.getElementsByClassName("title")[0].innerHTML = title;

		var readOnly = serverInfo.getElementsByTagName("readonly")[0].textContent;
		prepareReadOnly(readOnly);

		var rootDir = serverInfo.getElementsByTagName("rootdir")[0].textContent;
                setRootDir(rootDir);

	        // fill file list initially
                setCurrentDir(serverInfo.getElementsByTagName("currentdir")[0].textContent);

		// if successful: continue loading
		initMainpage2();
	}

	xhrTitle.open("GET", "?command=server-info", true);
	xhrTitle.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
	xhrTitle.send();

}

// deferred initialization after successful login
function initMainpage2() {

	// load footer
	var xhrFooter = new XMLHttpRequest();

	xhrFooter.onreadystatechange = function() {
		if (this.readyState != 4 || this.status != 200) {
			return;
		}
		document.getElementsByClassName("footer")[0].innerHTML = xhrFooter.responseText;
	}

	xhrFooter.open("GET", "?command=version", true);
	xhrFooter.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
	xhrFooter.send();
	
	// default action for "Cancel" button: hide dialog window
	document.getElementById("cancelbutton").onclick = hideDialog;

	// on click outside of menu, close menu
	document.getElementById("greyout").onclick = function() {
		hideDialog();
		hideMenu();
	}
	
	// on Escape, globally hide dialog and menu window
	document.onkeydown = function(evt) {
		if (evt.key == "Escape") {
			hideDialog();
			hideMenu();
		}
	}
}

function addDirectoryLinks(path) {
	var pos = 0;
	var result = "";
	var partial_path = "";

	while (pos < path.length) {
		var oldpos = pos;
		pos = path.indexOf("/", pos + 1);
		if (pos == -1) {
			pos = path.length;
		}

		partial_path += path.substr(oldpos, pos - oldpos);
		result += "<span class=\"link\" onclick=\"setCurrentDir('" + partial_path + "')\">" + path.substr(oldpos, pos - oldpos) + "</span>";
	}

	return result;
}

function getRootLink() {
	if (rootDir != "/") {
		return "<span class=\"link\" onclick=\"setCurrentDir('/')\">" + rootDir + "</span>";
	}

	return "";
}

function setCurrentDir(newDir) {
        if (newDir.endsWith("/")) {
                newDir = newDir.substr(0, newDir.length - 1);
        }
        if (!newDir.startsWith("/")) {
                newDir = "/" + newDir;
        }

	currentDir = newDir;
	loadContents(newDir);

	var menu = document.getElementsByClassName("menu")[0];
	var firsttd = menu.getElementsByClassName("firsttd")[0];
	
	var result = getRootLink();

	if (result == "" || newDir != "/") {
		newDir = addDirectoryLinks(newDir);
		result = result + newDir;
	}

	firsttd.innerHTML = result;
}

function download(filename) {
	var files = getSelectedFiles();

	// if activated via menu, download directly (not as zip)
	if (files.length == 1 && filename === undefined) {
		filename = files[0];
	}

	if (filename === undefined) { // download selection as ZIP
		showDialog();

		if (files.length == 0) {
			document.getElementById("dialog").innerHTML = "No files selected.";
			document.getElementById("okbutton").onclick = hideDialog;
			return;
		}

		document.getElementById("dialog").innerHTML = document.getElementById("download-zip-dialog").innerHTML;

		document.getElementById("okbutton").onclick = function() {
			hideDialog();

			// send info request for files
			var xhr = new XMLHttpRequest();

			xhr.onreadystatechange = function() {
				if (this.readyState != 4 || this.status != 200) {
					return;
				}

				var a = document.getElementById("download-a");
				a.setAttribute("download", "webbox-download.zip");
				var file = new Blob([this.response]);
				a.href = window.URL.createObjectURL(file);
				a.click();
				progressOff();
			}

			progressOn();
			var files = getSelectedFiles();
			var parser = new DOMParser();
			var xmlDocument = parser.parseFromString("<files></files>", "text/xml");
			var filesElement = xmlDocument.getElementsByTagName("files")[0];

			for (var i = 0; i < files.length; i++) {
				var fileElement = xmlDocument.createElement("file");
				fileElement.appendChild(document.createTextNode(files[i]));
				filesElement.appendChild(fileElement);
			}

			xhr.open("POST", absolutePath(currentDir) + "?command=download-zip", true);
			xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
			xhr.setRequestHeader("Content-type", "text/xml");
			xhr.responseType = 'blob';
			xhr.send(xmlDocument);
		}
	} else { // single file download
		var xhr = new XMLHttpRequest();

		xhr.onreadystatechange = function() {
			if (this.readyState != 4 || this.status != 200) {
				return;
			}

			var a = document.getElementById("download-a");
			a.setAttribute("download", filename);
			var file = new Blob([this.response]);
			a.href = window.URL.createObjectURL(file);
			a.click();
			progressOff();
		}

		var dir = currentDir;
		if (dir != "/") {
			dir += "/"
		}
		progressOn();
		xhr.open("GET", absolutePath(dir) + filename, true);
		xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
		xhr.responseType = 'blob';
		xhr.send();
	}
}

function createDir() {
	showDialog();

	// hide dialog when done
	document.getElementById("okbutton").onclick = function() {
		// send new folder request for directory
		var xhr = new XMLHttpRequest();

		xhr.onreadystatechange = function() {
			if (this.readyState != 4) {
				return;
			}
			if (this.status != 200) {
				document.getElementById("dialog").innerHTML = "HTTP error";
			} else {
				document.getElementById("dialog").innerHTML = xhr.responseText;
			}
			document.getElementById("okbutton").onclick = hideDialog;
			document.getElementById("okbutton").focus();
			loadContents(currentDir); // load new file list with new dir
		}

		var parser = new DOMParser();
		var xmlDocument = parser.parseFromString("<dirname></dirname>", "text/xml");
		var dirElement = xmlDocument.getElementsByTagName("dirname")[0];

		dirElement.appendChild(document.createTextNode(document.getElementById("newdir").value));

		xhr.open("POST", absolutePath(currentDir) + "?command=newdir", true);
		xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
		xhr.setRequestHeader("Content-type", "text/xml");
		xhr.send(xmlDocument);
	}
	
	document.getElementById("dialog").innerHTML = document.getElementById("create-dir-dialog").innerHTML;
	document.getElementById("newdir").focus();

	document.getElementById("newdir").onkeydown = function(evt) {
		if (evt.key == "Enter") {
			document.getElementById("okbutton").click();
		}
	}
}

function upload() {
	var uploadfile = document.getElementById("uploadfile");

	uploadfile.click();
}

// Callback on selected and uploaded file
function onUploadFile() {
	var xhr = new XMLHttpRequest();

	xhr.onreadystatechange = function() {
		if (this.readyState != 4) {
			return;
		}

		showDialog();
		var message = "";

		if (this.status != 200) {
			message = "HTTP error";
		} else {
			if (xhr.responseText == "") {
				message = "Upload successful.";
				loadContents(currentDir); // load new file list with uploaded file
			} else {
				message = xhr.responseText;
			}
		}

		document.getElementById("dialog").innerHTML = message;
		document.getElementById("cancelbutton").style.display = "none";
		document.getElementById("okbutton").onclick = function() {
			hideDialog();
			document.getElementById("cancelbutton").style.display = "block";
		}
		document.getElementById("okbutton").focus();
		progressOff();
	}

	progressOn();

        var uploadfile = document.getElementById("uploadfile");
        var formData = new FormData();

	for (var i = 0; i < uploadfile.files.length; i++) {
        	formData.append("uploadfile", uploadfile.files[i]);
	}

        xhr.open("POST", absolutePath(currentDir) + "?command=upload", true);
	xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
        xhr.send(formData);
}

function deleteItems() {
	showDialog();
	
	var files = getSelectedFiles();
	if (files.length == 0) {
		document.getElementById("dialog").innerHTML = "No files selected.";
		document.getElementById("okbutton").onclick = hideDialog;
		return;
	}

	var message = "Are sure to delete the following files and directories?<br/><br/>";

	for (var i = 0; i < files.length; i++) {
		message += files[i] + "<br/>";
	}

	document.getElementById("dialog").innerHTML = message;
	
	document.getElementById("okbutton").onclick = function() {

		var xhr = new XMLHttpRequest();

		xhr.onreadystatechange = function() {
			if (this.readyState != 4) {
				return;
			}
			if (this.status != 200) {
				document.getElementById("dialog").innerHTML = "HTTP error";
			} else {
				document.getElementById("dialog").innerHTML = xhr.responseText;
			}
			document.getElementById("okbutton").onclick = hideDialog;
			loadContents(currentDir); // load new file list with deleted items
		}

		var parser = new DOMParser();
		var xmlDocument = parser.parseFromString("<files></files>", "text/xml");
		var filesElement = xmlDocument.getElementsByTagName("files")[0];

		for (var i = 0; i < files.length; i++) {
			var fileElement = xmlDocument.createElement("file");
			fileElement.appendChild(document.createTextNode(files[i]));
			filesElement.appendChild(fileElement);
		}

		xhr.open("POST", absolutePath(currentDir) + "?command=delete", true);
		xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
		xhr.setRequestHeader("Content-type", "text/xml");
		xhr.send(xmlDocument);
	}
}

function copy() {
	showDialog();
	
	var files = getSelectedFiles();
	if (files.length == 0) {
		document.getElementById("dialog").innerHTML = "No files selected.";
		document.getElementById("okbutton").onclick = hideDialog;
		return;
	}

	var message = "";
	for (var i = 0; i < files.length; i++) {
		message += files[i] + "<br/>";
	}

	document.getElementById("dialog").innerHTML = document.getElementById("copy-dialog").innerHTML;
	document.getElementById("copydir").focus();
	document.getElementById("copydir").onkeydown = function(evt) {
		if (evt.key == "Enter") {
			document.getElementById("okbutton").click();
		}
	}

	document.getElementById("copyfiles").innerHTML = message;
	
	document.getElementById("okbutton").onclick = function() {

		var xhr = new XMLHttpRequest();

		xhr.onreadystatechange = function() {
			if (this.readyState != 4) {
				return;
			}
			if (this.status != 200) {
				document.getElementById("dialog").innerHTML = "HTTP error";
			} else {
				document.getElementById("dialog").innerHTML = xhr.responseText;
			}

			document.getElementById("okbutton").onclick = hideDialog;
			document.getElementById("okbutton").focus();
			loadContents(currentDir); // load new file list with deleted items
		}

		var parser = new DOMParser();
		var xmlDocument = parser.parseFromString("<request></request>", "text/xml");
		var filesElement = xmlDocument.getElementsByTagName("request")[0];
			
		var targetElement = xmlDocument.createElement("target");
		targetElement.appendChild(document.createTextNode(document.getElementById("copydir").value));
		filesElement.appendChild(targetElement);

		for (var i = 0; i < files.length; i++) {
			var fileElement = xmlDocument.createElement("file");
			fileElement.appendChild(document.createTextNode(files[i]));
			filesElement.appendChild(fileElement);
		}

		xhr.open("POST", absolutePath(currentDir) + "?command=copy", true);
		xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
		xhr.setRequestHeader("Content-type", "text/xml");
		xhr.send(xmlDocument);
	}
}

function move() {
	showDialog();
	
	var files = getSelectedFiles();
	if (files.length == 0) {
		document.getElementById("dialog").innerHTML = "No files selected.";
		document.getElementById("okbutton").onclick = hideDialog;
		return;
	}

	var message = "";
	for (var i = 0; i < files.length; i++) {
		message += files[i] + "<br/>";
	}

	document.getElementById("dialog").innerHTML = document.getElementById("move-dialog").innerHTML;
	document.getElementById("movedir").focus();
	document.getElementById("movedir").onkeydown = function(evt) {
		if (evt.key == "Enter") {
			document.getElementById("okbutton").click();
		}
	}

	document.getElementById("movefiles").innerHTML = message;
	
	document.getElementById("okbutton").onclick = function() {

		var xhr = new XMLHttpRequest();

		xhr.onreadystatechange = function() {
			if (this.readyState != 4) {
				return;
			}
			if (this.status != 200) {
				document.getElementById("dialog").innerHTML = "HTTP error";
			} else {
				document.getElementById("dialog").innerHTML = xhr.responseText;
			}

			document.getElementById("okbutton").onclick = hideDialog;
			document.getElementById("okbutton").focus();
			loadContents(currentDir); // load new file list with deleted items
		}

		var parser = new DOMParser();
		var xmlDocument = parser.parseFromString("<request></request>", "text/xml");
		var filesElement = xmlDocument.getElementsByTagName("request")[0];
			
		var targetElement = xmlDocument.createElement("target");
		targetElement.appendChild(document.createTextNode(document.getElementById("movedir").value));
		filesElement.appendChild(targetElement);

		for (var i = 0; i < files.length; i++) {
			var fileElement = xmlDocument.createElement("file");
			fileElement.appendChild(document.createTextNode(files[i]));
			filesElement.appendChild(fileElement);
		}

		xhr.open("POST", absolutePath(currentDir) + "?command=move", true);
		xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
		xhr.setRequestHeader("Content-type", "text/xml");
		xhr.send(xmlDocument);
	}
}

function rename() {
	showDialog();
	
	var files = getSelectedFiles();
	if (files.length == 0) {
		document.getElementById("dialog").innerHTML = "No files selected.";
		document.getElementById("okbutton").onclick = hideDialog;
		return;
	}
	if (files.length > 1) {
		document.getElementById("dialog").innerHTML = "Only one file can be renamed at once.";
		document.getElementById("okbutton").onclick = hideDialog;
		return;
	}

	document.getElementById("renameold").innerHTML = files[0];

	document.getElementById("dialog").innerHTML = document.getElementById("rename-dialog").innerHTML;
	document.getElementById("renamenew").value = files[0];
	document.getElementById("renamenew").focus();
	document.getElementById("renamenew").onkeydown = function(evt) {
		if (evt.key == "Enter") {
			document.getElementById("okbutton").click();
		}
	}

	document.getElementById("okbutton").onclick = function() {

		var xhr = new XMLHttpRequest();

		xhr.onreadystatechange = function() {
			if (this.readyState != 4) {
				return;
			}
			if (this.status != 200) {
				document.getElementById("dialog").innerHTML = "HTTP error";
			} else {
				document.getElementById("dialog").innerHTML = xhr.responseText;
			}

			document.getElementById("okbutton").onclick = hideDialog;
			document.getElementById("okbutton").focus();
			loadContents(currentDir); // load new file list with deleted items
		}

		var parser = new DOMParser();
		var xmlDocument = parser.parseFromString("<request></request>", "text/xml");
		var filesElement = xmlDocument.getElementsByTagName("request")[0];
			
		var oldnameElement = xmlDocument.createElement("oldname");
		oldnameElement.appendChild(document.createTextNode(document.getElementById("renameold").childNodes[0].nodeValue));
		filesElement.appendChild(oldnameElement);
		
		var newnameElement = xmlDocument.createElement("newname");
		newnameElement.appendChild(document.createTextNode(document.getElementById("renamenew").value));
		filesElement.appendChild(newnameElement);

		xhr.open("POST", absolutePath(currentDir) + "?command=rename", true);
		xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
		xhr.setRequestHeader("Content-type", "text/xml");
		xhr.send(xmlDocument);
	}
}

// File info: date, size, type
function info() {
	showDialog();
	document.getElementById("cancelbutton").style.display = "none"; // hide "cancel" button in info dialog, only provide "OK"

	// hide dialog when done
	document.getElementById("okbutton").onclick = function() {
		hideDialog();
		document.getElementById("cancelbutton").style.display = "block";
	}
	
	var files = getSelectedFiles();
	if (files.length == 0) {
		files = getFileList();
		if (files.length == 0) {
			document.getElementById("dialog").innerHTML = "No files available.";
			return;
		}
	}

	// send info request for files
	var xhr = new XMLHttpRequest();

	xhr.onreadystatechange = function() {
		if (this.readyState != 4) {
			return;
		}
		if (this.status != 200) {
			document.getElementById("dialog").innerHTML = "HTTP error";
		} else {
			document.getElementById("dialog").innerHTML = xhr.responseText;
		}
	}

	var parser = new DOMParser();
	var xmlDocument = parser.parseFromString("<files></files>", "text/xml");
	var filesElement = xmlDocument.getElementsByTagName("files")[0];

	for (var i = 0; i < files.length; i++) {
                if (files[i] != "..") {
                        var fileElement = xmlDocument.createElement("file");
                        fileElement.appendChild(document.createTextNode(files[i]));
                        filesElement.appendChild(fileElement);
                }
	}

	xhr.open("POST", absolutePath(currentDir) + "?command=info", true);
	xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
	xhr.setRequestHeader("Content-type", "text/xml");
	xhr.send(xmlDocument);
}

// select all files, except if all are selected, unselect all
function selectAll() {
	var files = getFileList();
	
	var allSelected = true;

	for (var i = 0; i < files.length; i++) {
		if (getSelection(files[i]) === false && files[i] != "..") {
			allSelected = false;
		}
	}

	for (var i = 0; i < files.length; i++) {
		if (allSelected) {
			clearSelection(files[i]);
		} else {
			setSelection(files[i]);
		}
	}
}

function refresh() {
	loadContents(currentDir); // load new file list
}

function logout() {
	showDialog();

	document.getElementById("okbutton").onclick = function() {
		hideDialog();

		var menu = document.getElementsByClassName("menu")[0];
		var firsttd = menu.getElementsByClassName("firsttd")[0];
		firsttd.innerHTML = "/";

		clearContents();

		username = "notaname";
		password = "password";
		initMainpage();
	}

	document.getElementById("dialog").innerHTML = document.getElementById("logout-dialog").innerHTML;
}

// Progress indication

function drawDot(c, offsetx, offsety, radius, distance, phase) {
        c.beginPath();
        c.arc(distance * Math.sin(phase) + offsetx,
                - distance * Math.cos(phase) + offsety, radius, 0, 2 * Math.PI);
        c.fill();
}

function drawLogo(canvasid, rotation) {
        var canvas = document.getElementById(canvasid);

        var height = canvas.height;
        var width = canvas.width;
        var radius = height * 0.1;
        var distance = height * 0.1 * 4 / 3;
        
        var c = canvas.getContext("2d");

        c.clearRect(0, 0, width, height);
        c.fillStyle = "#1132A7";
        drawDot(c, width / 2, height / 2, radius, distance, rotation);
        drawDot(c, width / 2, height / 2, radius, distance, rotation + 2 * Math.PI / 3);
        drawDot(c, width / 2, height / 2, radius, distance, rotation + 2 * Math.PI / 3 * 2);
        drawDot(c, width / 2, height / 2, radius, distance * 2, rotation + Math.PI);
        drawDot(c, width / 2, height / 2, radius, distance * 2, rotation + Math.PI + 2 * Math.PI / 3);
        drawDot(c, width / 2, height / 2, radius, distance * 2, rotation + Math.PI + 2 * Math.PI / 3 * 2);
}

var progressState = 0;

function drawAni(timeStamp) {
        var rotation = timeStamp / 1000 * 6;

        drawLogo("progresscanvas", rotation);

	if (progressState == 1) {
	        requestAnimationFrame(drawAni);
	}
}

function progressOn() {
	progressState = 1;
	document.getElementById("progresswindow").style.display = "block";
        requestAnimationFrame(drawAni);
}

function progressOff() {
	progressState = 0;
	document.getElementById("progresswindow").style.display = "none";
}