using System;
using System.Net;
using System.Net.Sockets;

public class AllocsTelnetConnection
{
	private bool authenticated = false;
	private bool authEnabled;
	private TcpClient client;
	private NetworkStream stream;
	private string lineBuffer = string.Empty;
	private EndPoint endpoint;

	public AllocsTelnetConnection (TcpClient client, bool authEnabled)
	{
		this.authEnabled = authEnabled;
		this.client = client;
		this.stream = client.GetStream ();
		this.endpoint = client.Client.RemoteEndPoint;
	}

	public EndPoint GetEndPoint ()
	{
		return endpoint;
	}

	private void WriteByte (byte v)
	{
		if (!IsClosed () && stream.CanWrite) {
			stream.WriteByte (v);
		}
	}

	public void WriteLine (string s)
	{
		try {
			if (!IsClosed () && stream.CanWrite) {
				for (int i = 0; i < s.Length; i++) {
					WriteByte ((byte)s [i]);
				}
				WriteByte(13);
				WriteByte (10);
			}
		} catch (Exception e) {
			Log.Out("Error writing to client: " + e);
		}
	}

	public void Close ()
	{
		if (client != null)
			client.Close ();
		client = null;
	}

	public bool IsClosed ()
	{
		if (client != null && !client.Connected) {
			Log.Out ("Telnet connection interrupted: " + endpoint);
		}
		return (client == null) || (!client.Connected);
	}

	public bool IsAuthenticated ()
	{
		return !authEnabled || authenticated;
	}

	public void SetAuthenticated ()
	{
		authenticated = true;
	}

	public bool Read ()
	{
		while (!IsClosed() && stream.CanRead && stream.DataAvailable) {
			int b = stream.ReadByte ();
			if (b == '\r' || b == '\n') {
				if (lineBuffer.Length > 0)
					return true;
			} else {
				lineBuffer += (char)b;
			}
		}
		return false;
	}

	public string GetLine ()
	{
		string res = lineBuffer;
		lineBuffer = string.Empty;
		return res;
	}
}