/**
 *  a network server that detects presence of dogs on the Internet
 *
 *  @version   1.1 Jan 21 1996
 *  @author    Peter van der Linden
 *  @author    From the book "Just Java"
 *
 *
 */
import java.io.*;
import java.net.*;
import java.util.Random;

class dogserver {
    public static void main(String a[])  
	{
        int port = 4444;
		if (a.length >0)
		{	port = Integer.parseInt(a[0]);
		}
		
        Socket sock= null;
		ServerSocket servsock = null;
        String query = "If you met me would you shake my hand, or sniff it?";
		try
		{
        	servsock = new ServerSocket(port);
		}
		catch(IOException e)
		{	System.out.println("Could not open port.");
			System.exit(1);	
		}
    	while (true) try {
        // wait for the next client connection
			sock=servsock.accept();

        // Get I/O streams from the socket
			PrintStream out = new PrintStream( sock.getOutputStream() );
			BufferedReader in  = new BufferedReader(new InputStreamReader( sock.getInputStream() ));

		// Send our query
			out.println(query);
			out.flush();

		// get the reply
			Random ran = new Random();
			String reply = in.readLine();
			if (reply != null && reply.toLowerCase().indexOf("sniff") > -1) 
			{	//System.out.println("On the Internet I know this is a DOG!");
				out.println("You're"+ dogQualifiers[Math.abs(ran.nextInt()) % dogQualifiers.length]+ "a dog.");
				out.flush();
			}
			else 
			{	//System.out.println("Probably a person or an AI experiment");
				out.println("You're a person" + peopleQualifiers[Math.abs(ran.nextInt()) % peopleQualifiers.length]);
				out.flush();
			}
		
		// Close this connection, (not the overall server socket)
		sock.close();
     }
     catch (IOException e)
     { 	System.out.println("IOException from dog server.");
     }
	 
  }
  
  private static final String [] dogQualifiers = 
  {	" definitely ",
  	" certainly ",
	" unquestionably ",
	" without any doubt "
  };
  
  private static final String [] peopleQualifiers = 
  {	" or something.",
  	" or an AI experiment.",
	" or a very tricky fido.",
	" of course."
  };
  
}