//--
//-- Filesystem code
//--
//#
//# This code is designed to be reusable, but please take care,
//# there are some intricacies that make it tricky to use these
//# functions with full UTF-8 files. For more details, see:
//#
//# http://trac.tiddlywiki.org/ticket/99
//#
//#

function copyFile(dest,source)
{
	return config.browser.isIE ? ieCopyFile(dest,source) : false;
}

function saveFile(fileUrl,content)
{
	var r = mozillaSaveFile(fileUrl,content);
	if(!r)
		r = ieSaveFile(fileUrl,content);
	if(!r)
		r = javaSaveFile(fileUrl,content);
	return r;
}

function loadFile(fileUrl)
{
	var r = mozillaLoadFile(fileUrl);
	if((r == null) || (r == false))
		r = ieLoadFile(fileUrl);
	if((r == null) || (r == false))
		r = javaLoadFile(fileUrl);
	return r;
}

function ieCreatePath(path)
{
	try {
		var fso = new ActiveXObject("Scripting.FileSystemObject");
	} catch(ex) {
		return null;
	}

	//# Remove the filename, if present. Use trailing slash (i.e. "foo\bar\") if no filename.
	var pos = path.lastIndexOf("\\");
	if(pos==-1)
		pos = path.lastIndexOf("/");
	if(pos!=-1)
		path = path.substring(0,pos+1);

	//# Walk up the path until we find a folder that exists
	var scan = [path];
	var parent = fso.GetParentFolderName(path);
	while(parent && !fso.FolderExists(parent)) {
		scan.push(parent);
		parent = fso.GetParentFolderName(parent);
	}

	//# Walk back down the path, creating folders
	for(i=scan.length-1;i>=0;i--) {
		if(!fso.FolderExists(scan[i])) {
			fso.CreateFolder(scan[i]);
		}
	}
	return true;
}

// Returns null if it can't do it, false if there's an error, true if it saved OK
function ieSaveFile(filePath,content)
{
	ieCreatePath(filePath);
	try {
		var fso = new ActiveXObject("Scripting.FileSystemObject");
	} catch(ex) {
		//# alert("Exception while attempting to save\n\n" + ex.toString());
		return null;
	}
	var file = fso.OpenTextFile(filePath,2,-1,0);
	file.Write(content);
	file.Close();
	return true;
}

// Returns null if it can't do it, false if there's an error, or a string of the content if successful
function ieLoadFile(filePath)
{
	try {
		var fso = new ActiveXObject("Scripting.FileSystemObject");
		var file = fso.OpenTextFile(filePath,1);
		var content = file.ReadAll();
		file.Close();
	} catch(ex) {
		//# alert("Exception while attempting to load\n\n" + ex.toString());
		return null;
	}
	return content;
}

function ieCopyFile(dest,source)
{
	ieCreatePath(dest);
	try {
		var fso = new ActiveXObject("Scripting.FileSystemObject");
		fso.GetFile(source).Copy(dest);
	} catch(ex) {
		return false;
	}
	return true;
}

// Returns null if it can't do it, false if there's an error, true if it saved OK
function mozillaSaveFile(filePath,content)
{
	if(window.Components) {
		try {
			netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
			var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
			file.initWithPath(filePath);
			if(!file.exists())
				file.create(0,0x01B4);// 0x01B4 = 0664
			var out = Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream);
			out.init(file,0x22,0x04,null);
			out.write(content,content.length);
			out.flush();
			out.close();
			return true;
		} catch(ex) {
			//# alert("Exception while attempting to save\n\n" + ex);
			return false;
		}
	}
	return null;
}

// Returns null if it can't do it, false if there's an error, or a string of the content if successful
function mozillaLoadFile(filePath)
{
	if(window.Components) {
		try {
			netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
			var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
			file.initWithPath(filePath);
			if(!file.exists())
				return null;
			var inputStream = Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(Components.interfaces.nsIFileInputStream);
			inputStream.init(file,0x01,0x04,null);
			var sInputStream = Components.classes["@mozilla.org/scriptableinputstream;1"].createInstance(Components.interfaces.nsIScriptableInputStream);
			sInputStream.init(inputStream);
			var contents = sInputStream.read(sInputStream.available());
			sInputStream.close();
			inputStream.close();
			return contents;
		} catch(ex) {
			//# alert("Exception while attempting to load\n\n" + ex);
			return false;
		}
	}
	return null;
}

function javaUrlToFilename(url)
{
	var f = "//localhost";
	if(url.indexOf(f) == 0)
		return url.substring(f.length);
	var i = url.indexOf(":");
	return i > 0 ? url.substring(i-1) : url;
}

function javaSaveFile(filePath,content)
{
	try {
		if(document.applets["TiddlySaver"])
			return document.applets["TiddlySaver"].saveFile(javaUrlToFilename(filePath),"UTF-8",content);
	} catch(ex) {
	}
	try {
		var s = new java.io.PrintStream(new java.io.FileOutputStream(javaUrlToFilename(filePath)));
		s.print(content);
		s.close();
	} catch(ex2) {
		return null;
	}
	return true;
}

function javaLoadFile(filePath)
{
	try {
		if(document.applets["TiddlySaver"]) {
			var ret = document.applets["TiddlySaver"].loadFile(javaUrlToFilename(filePath),"UTF-8");
			if(!ret)
				return null;
			return String(ret);
		}
	} catch(ex) {
	}
	var content = [];
	try {
		var r = new java.io.BufferedReader(new java.io.FileReader(javaUrlToFilename(filePath)));
		var line;
		while((line = r.readLine()) != null)
			content.push(String(line));
		r.close();
	} catch(ex2) {
		return null;
	}
	return content.join("\n");
}