// ExampleClient.java
// Send a current position to server and then get a new position 
// from the server
import vrml.*;
import vrml.field.*;
import vrml.node.*;

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

public class ExampleClient extends Script{
   public final static int PORT = 4130;
   public final static String HOST = "localhost"; // server host name

   Socket socket = null;
   DataInputStream in = null;     // input stream from server to client
   DataOutputStream out = null;   // output sream from client to server
   Browser b;                     // for displaying error message to user
   Node target = null;
   SFVec3f trans = null;         
   float[] coord = null;
   float[] rotation = null;

   public void initialize(){
      b = getBrowser();
      // get the reference to 'translation' field of 'target' node
      target = (Node)((SFNode)getField("target")).getValue();
      trans = (SFVec3f)target.getExposedField("translation");
      coord = new float[3];
      rotation = new float[4];

      try {
         // open network and input/output stream
         socket = new Socket("localhost", PORT);
         in = new DataInputStream(socket.getInputStream());
         out = new DataOutputStream(socket.getOutputStream());
      } catch (UnknownHostException e) {
         b.setDescription("Unknown host: " + HOST);
      } catch (Exception e) {
         b.setDescription("Connection error");
      }
   }

   public void processEvent(Event ev) {
     ((ConstSFRotation)ev.getValue()).getValue(rotation); // get rotation angle
     
      try {
         // get current position
         trans.getValue(coord);

	 // send collision angle
	 out.writeFloat(rotation[3]);

         // send current position to server
         out.writeFloat(coord[0]);
         out.writeFloat(coord[1]);
         out.writeFloat(coord[2]);

         // receive new position from server
         coord[0] = in.readFloat();
         coord[1] = in.readFloat();
         coord[2] = in.readFloat();

         // display new position 
         b.setDescription("position: " + coord[0] + "," + 
             coord[1] + "," + coord[2]);

         // set new position 
         trans.setValue(coord);
      } catch (IOException e) {
         b.setDescription("IOException:  " + e);
      }
   }

   public void shutdown(){ // closing stream and network
      try {
         out.close();
         in.close();
         socket.close();
      } catch (Exception e) {
         b.setDescription("Connection close error");
      }
   }
}