udp_server

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

public class server {
    public static void main(String[] args) {
        int MAX = 1;
        char[] moves = {'s','c','f'};
        DatagramSocket s;
        byte[] buffer;
        DatagramPacket pkt;
        DatagramPacket tosend;
        char clientMove;
        char move;
        int cw = 0;
        int cp = 0;
        int exit = 0;

        try {
            s = new DatagramSocket(12345);
            buffer = new byte[MAX];
            pkt = new DatagramPacket(buffer, MAX);

            System.out.println("Server: " + s.getLocalAddress() + ":" + s.getLocalPort());
            while(true) {
                s.receive(pkt);
                clientMove = (new String(buffer,0,MAX)).charAt(0);
                if(clientMove == 'p') {
                    InetAddress ia = pkt.getAddress();
                    int port = pkt.getPort();
                    System.out.println("** Now playing with " + ia.getHostAddress() + ":" + port + " **");
                    cp++;
                    // "k"
                    tosend = new DatagramPacket("k".getBytes(), 1, ia, port);
                    s.send(tosend);
                    while(exit == 0) {
                        s.receive(pkt);
                        clientMove = (new String(buffer,0,MAX)).charAt(0);

                        if(clientMove == 'y') {
                            cw++;
                            move = 'b';
                            exit = 1;
                        }
                        else if(clientMove == 'i') {
                            move = 'b';
                            exit = 1;
                        }
                        else {
                            move = doMove(moves);
                            System.out.println("S: " + move + " --- C: " + clientMove);
                        }

                        tosend = new DatagramPacket((move + "").getBytes(), 1, ia, port);
                        s.send(tosend);
                    }
                    System.out.println("** Won " + cw + " matches out of " + cp + " **")
                    exit = 0;
                }
            }
        }
        catch(Exception e) {
            e.printStackTrace();
        }

    }

    public static char doMove(char[] arr) {
        return arr[(int)(System.currentTimeMillis() % arr.length)];
    }
}