package net.sourceforge.jsocks;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 Abstract class which describes SOCKS4/5 response/request.
*/
public abstract class ProxyMessage {
    /** Host as an IP address */
    public InetAddress ip = null;
    /** SOCKS version, or version of the response for SOCKS4*/
    public int version;
    /** Port field of the request/response*/
    public int port;
    /** Request/response code as an int*/
    public int command;
    /** Host as string.*/
    public String host = null;
    /** User field for SOCKS4 request messages*/
    public String user = null;

    ProxyMessage(int command, InetAddress ip, int port) {
        this.command = command;
        this.ip      = ip;
        this.port    = port;
    }

    ProxyMessage() {
    }


    /**
      Initialises Message from the stream. Reads server response from
      given stream.
      @param in Input stream to read response from.
      @throws SocksException If server response code is not SOCKS_SUCCESS(0), or
      if any error with protocol occurs.
      @throws IOException If any error happens with I/O.
    */
    public abstract void read(InputStream in)
    throws SocksException,
        IOException;


    /**
      Initialises Message from the stream. Reads server response or client
      request from given stream.

      @param in Input stream to read response from.
      @param clinetMode If true read server response, else read client request.
      @throws SocksException If server response code is not SOCKS_SUCCESS(0) and
      reading in client mode, or if any error with protocol occurs.
      @throws IOException If any error happens with I/O.
    */
    public abstract void read(InputStream in, boolean client_mode)
    throws SocksException,
        IOException;


    /**
     Writes the message to the stream.
     @param out Output stream to which message should be written.
    */
    public abstract void write(OutputStream out)throws SocksException,
        IOException;

    /**
     Get the Address field of this message as InetAddress object.
     @return Host address or null, if one can't be determined.
    */
    public InetAddress getInetAddress() throws UnknownHostException {
        return ip;
    }


    /**
     Get string representaion of this message.
     @return string representation of this message.
    */
    public String toString() {
        return
            "Proxy Message:\n" +
            "Version:" + version + "\n" +
            "Command:" + command + "\n" +
            "IP:     " + ip + "\n" +
            "Port:   " + port + "\n" +
            "User:   " + user + "\n" ;
    }

//Package methods
//////////////////

    static final String bytes2IPV4(byte[] addr, int offset) {
        String hostName = "" + (addr[offset] & 0xFF);

        for (int i = offset + 1; i < offset + 4; ++i)
            hostName += "." + (addr[i] & 0xFF);

        return hostName;
    }

    static final String bytes2IPV6(byte[] addr, int offset) {
        //Have no idea how they look like!
        return null;
    }

}