import java.io.*;
import java.net.*;
import java.util.*;

public class KaZaServer implements Runnable
{
    public static final int LISTEN_PORT = 3442;
    private ServerSocket m_serverSocket;
    private HashMap<String, ClientInfo> m_clientData;

    public void run()
    {
        try {
            m_serverSocket = new ServerSocket(LISTEN_PORT);

            /* porcess connection requests */
            for (;;)
            {
                Socket clientSocket = m_serverSocket.accept();

                Thread thread = new Thread(new ClientHandler(clientSocket));
                thread.start();
            }
        } catch (IOException ioe) {
            System.out.println("KaZaServer: IO Exception!");
            ioe.printStackTrace();
            return;
        }
    }

    public void close()
    {
    }

    public String[] getClientList()
    {
        Set<String> s;
        synchronized (m_clientData)
        {
            s = m_clientData.keySet();
        }
        return (String[]) s.toArray();
    }

    private class ClientInfo
    {
        String userName;
    }

    private class ClientHandler implements Runnable
    {
        private Socket m_socket;
        private String m_clientIP;

        public ClientHandler(Socket socket)
        {
            m_socket = socket;
            m_clientIP = m_socket.getInetAddress().getHostAddress();
            synchronized (m_clientData)
            {
                if (!m_clientData.containsKey(m_clientIP))
                { 
                    m_clientData.put(socket.getInetAddress().getHostAddress(),
                            new ClientInfo());
                }
            }
        }

        public void run()
        {
            try
            {
                BufferedReader br = new BufferedReader(
                                        new InputStreamReader(
                                            m_socket.getInputStream()));

                /* loop processing client messages */
                for (;;)
                {
                    String inLine = br.readLine();

                    StringTokenizer tokens = new StringTokenizer(inLine);
                    if (!tokens.hasMoreTokens())
                        continue;

                    String opCode = tokens.nextToken();
                    opCode.toLowerCase();
                    if (opCode.equals("HELO"))
                    {
                        /* user is announcing his or her username */
                    }
                }
            } catch (Exception e) { }
        }
    }
}