import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.util.Arrays;

public class VoteServerUDP {

  public static void main(String[] args) throws IOException {

    if (args.length != 1) { // Test for correct # of args
      throw new IllegalArgumentException("Parameter(s): <Port>");
    }

    int port = Integer.parseInt(args[0]); // Receiving Port

    DatagramSocket sock = new DatagramSocket(port); // Receive socket

    byte[] inBuffer = new byte[VoteMsgTextCoder.MAX_WIRE_LENGTH];
    // Change Bin to Text for a different coding approach
    VoteMsgCoder coder = new VoteMsgTextCoder();
    VoteService service = new VoteService();

    while (true) {
      DatagramPacket packet = new DatagramPacket(inBuffer, inBuffer.length);
      sock.receive(packet);
      byte[] encodedMsg = Arrays.copyOfRange(packet.getData(), 0, packet.getLength());
      System.out.println("Handling request from " + packet.getSocketAddress() + " ("
          + encodedMsg.length + " bytes)");

      try {
        VoteMsg msg = coder.fromWire(encodedMsg);
        msg = service.handleRequest(msg);
        packet.setData(coder.toWire(msg));
        System.out.println("Sending response (" + packet.getLength() + " bytes):");
        System.out.println(msg);
        sock.send(packet);
      } catch (IOException ioe) {
        System.err.println("Parse error in message: " + ioe.getMessage());
      }
    }
  }
}