// Adpated by Agustin J. Gonzalez from 
//: c15:ChatterClient.java
// From Thinking in Java, 2nd Edition

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

public class UDP_Client {
  // Can listen & send on the same socket:
  private DatagramSocket s;
  private InetAddress hostAddress;
  private byte[] buf = new byte[1000];
  private DatagramPacket dp = new DatagramPacket(buf, buf.length);
  private int id;

  public UDP_Client(String serverName) {
    try {
      // Auto-assign port number:
      s = new DatagramSocket();
      hostAddress = InetAddress.getByName(serverName);
    } catch(UnknownHostException e) {
      System.err.println("Cannot find host");
      System.exit(1);
    } catch(SocketException e) {
      System.err.println("Can't open socket");
      e.printStackTrace();
      System.exit(1);
    } 
    System.out.println("UDP_Client starting");
  }
  public void sendData() {
    try {
      for(int i = 0; i < 25; i++) {
        String outMessage = "Client message #" + i;
        // Make and send a datagram:
        byte[] sendData = outMessage.getBytes();
        s.send(new DatagramPacket(sendData, sendData.length, hostAddress, UDP_EchoServer.INPORT));
        // Block until it echoes back:
        s.receive(dp);
        // Print out the echoed contents:
        String rcvd = "Client rcvd from " + dp.getAddress() + ", " + dp.getPort() + ": " +
                                                  new String(dp.getData(), 0, dp.getLength());
        System.out.println(rcvd);
      }
    } catch(IOException e) {
      e.printStackTrace();
      System.exit(1);
    }
  }
  public static void main(String[] args) {
      new UDP_Client(args[0]).sendData();
  }
}