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

public class PingClientTimer
{

   public static void main(String[] args) throws Exception
   {
      int lastSeen = -1;

      // Get command line argument.

      if (args.length != 2) {
         System.out.println("Required arguments: host, port");
         return;
      }

      InetAddress Server = InetAddress.getByName(args[0]);
      int port = Integer.parseInt(args[1]);

      DatagramSocket socket = new DatagramSocket();
      socket.setSoTimeout(2000);

      Timer myTimer = new Timer();

      // Sender extends TimerTask.

      Sender mySender = new Sender(socket, Server, port);

      /* Schedule mySender's run() to run every second, starting
       * immediately.
       */

      myTimer.scheduleAtFixedRate(mySender, 0, 1000);

      // Processing loop.

      for (int i = 0; i < 10; i++) {

         /*Date SendTime = new Date();

         String Request = new String("PING " + i + " "
                                     + SendTime.getTime()+ "\n");
 
         byte[] RequestBuffer = Request.getBytes();
         DatagramPacket RequestPacket =
            new DatagramPacket(RequestBuffer, RequestBuffer.length,
                               Server, port);
         socket.send(RequestPacket); */

         DatagramPacket ReplyPacket =
            new DatagramPacket(new byte[1024], 1024);

         try {
            socket.receive(ReplyPacket);
         }
         catch(Exception E) {
            System.out.println(i + " Timed out");
            continue;
         }

         Date ReceiveTime = new Date();
         
         String Reply = new String(ReplyPacket.getData(), 0,
                                   ReplyPacket.getLength());

         Scanner ReplyScanner = new Scanner(Reply).useDelimiter("\\s+");

         ReplyScanner.next();
         int count = ReplyScanner.nextInt();
         if (count != lastSeen + 1)
            System.out.println(count + " " + i
                               + " Message received out of order");
         else {
            long echoTime = ReceiveTime.getTime()
               - ReplyScanner.nextLong();
            System.out.println(count + " " + echoTime);
         }

         lastSeen = count;
      }

      myTimer.cancel();
   }
}


class Sender extends TimerTask
{
   DatagramSocket socket;
   InetAddress Server;
   int port;
   int i = 0;

   public Sender(DatagramSocket socket, InetAddress Server, int port)
   {
      this.socket = socket;
      this.Server = Server;
      this.port = port;
   }

   public void run()
   {
      Date SendTime = new Date();

      String Request = new String("PING " + i + " "
                                  + SendTime.getTime()+ "\n");
 
      byte[] RequestBuffer = Request.getBytes();
      DatagramPacket RequestPacket =
         new DatagramPacket(RequestBuffer, RequestBuffer.length,
                            Server, port);

      try
      {
         socket.send(RequestPacket);
      }
      catch(Exception e)
      {
      }

      i++;
   }
}