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var nodeJs = typeof process != 'undefined';

var fs = nodeJs ? require('fs') : null;

var BA_EXISTS      = 0x01;
var BA_REGULAR     = 0x02;
var BA_DIRECTORY   = 0x04;
var BA_HIDDEN      = 0x08;

var ACCESS_EXECUTE = 0x01;
var ACCESS_WRITE   = 0x02;
var ACCESS_READ    = 0x04;

var O_RDONLY = 1;
var O_RDWR   = 2;
var O_SYNC   = 4;
var O_DSYNC  = 8;

var IO = function() {
};

IO.remove = function(path) {
	if (!fs) return;
	fs.unlinkSync(ptah);
};

IO.createDirectory = function(path) {
	if (!fs) return true;
	try {
		fs.mkdirSync(path);
		return true;
	} catch (e) {
		return false;
	}
};

IO.rename = function(oldPath, newPath) {
	if (!fs) return;
	fs.renameSync(oldPath, newPath)
};

IO.list = function(path) {
	if (!fs) return [];
	return fs.readdirSync(path);
};

IO.getCwd = function() { return (nodeJs) ? process.cwd() : '/assets'; };

IO.getLength = function(path) {
	if (!fs) return 0;
	var stat = fs.lstatSync(path);
	return stat.size;
};

IO.getBooleanAttributes = function(path) {
	if (!fs) return 0;
	var out = 0;
	try {
		var stat = fs.lstatSync(path);
		out |= BA_EXISTS;
		if (stat.isFile()) out |= BA_REGULAR;
		if (stat.isDirectory()) out |= BA_DIRECTORY;
	} catch (e) {
	}
	return out;
};

IO.checkAccess = function(path, flags) {
	if (!fs) return false;
	try {
		var mode = 0;
		if ((flags & ACCESS_EXECUTE) != 0) mode |= fs.X_OK;
		if ((flags & ACCESS_WRITE) != 0) mode |= fs.W_OK;
		if ((flags & ACCESS_READ) != 0) mode |= fs.R_OK;
		fs.accessSync(path, mode);
		return true;
	} catch (e) {
	}
	return false;
};

IO.Stream = function() {
	this.position = 0;
	this.length = 0;
};

IO.Stream.prototype.open = function(path, flags) {
	if (!fs) N.throwRuntimeException("Can't open");
	try {
		var flagsStr = '';
		if ((flags & O_RDONLY) != 0) flagsStr += 'r';
		if ((flags & O_RDWR) != 0) flagsStr += 'w';
		this.fd = fs.openSync(path, flagsStr); // @TODO: convert flags!!!
		var stat = fs.fstatSync(this.fd);
		this.position = 0;
		this.length = stat.size;
	} catch (e) {
		throw {% CONSTRUCTOR java.io.FileNotFoundException:(Ljava/lang/String;)V %}(N.str('' + e));
		//N.throwRuntimeException('' + e);
	}
};

IO.Stream.prototype.close = function() {
	if (!fs) return;
	fs.closeSync(this.fd);
};

IO.Stream.prototype.read = function(data, offset, length) {
	if (!fs) return -1;
	if (offset < 0 || offset >= this.length) return -1;
	if (length == 0) return 0;
	var buffer = new Buffer(length);
	var readed = fs.readSync(this.fd, buffer, offset, length, this.position);
	if (readed > 0) this.position += readed;
	for (var n = 0; n < readed; n++) data[n] = buffer[n];
	return readed;
};

IO.Stream.prototype.write = function(data, offset, length) {
	if (!fs) return -1;
	var written = fs.writeSync(this.fd, new Buffer(data), offset, length, this.position);
	if (written > 0) this.position += written;
	return written;
};

IO.Stream.prototype.getPosition = function() {
	return this.position;
};

IO.Stream.prototype.setPosition = function(v) {
	this.position = v;
};

IO.Stream.prototype.getLength = function() {
	return this.length;
};

IO.Stream.prototype.setLength = function(v) {
	this.length = v;
	fs.ftruncateSync(this.fd, v);
};