import java.awt.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;

public class Server extends UnicastRemoteObject implements RemoteServer {

   public static void main(String[] args) {
      try {
         Server server = new Server();
         // Ny grej: startar ett eget registry :-)
         //LocateRegistry.createRegistry(1099);
         // Kör detta istället när en annan Server redan dragit igång ett registry:
         //LocateRegistry.createRegistry(2004);
         Registry registry = LocateRegistry.getRegistry(1099);
         
         Naming.rebind("server2", server);
         System.out.println("server bound");
      } catch(Exception e) {
         System.out.println("Exception generated: "+ e.getMessage());
      }
   }

   public Server() throws RemoteException {}

   public int[] updateImage(Dimension d, double x0Real, double x1Real, double y0Real, double y1Real) throws RemoteException {
      int[] ia = new int[d.width * d.height];
      for(int i = 0; i < d.width; i++)
         for(int j = 0; j < d.height; j++) {
            int color = iterToInfinity(i, j, d, x0Real, x1Real, y0Real, y1Real);
            ia[i + d.width * j] = new Color(255 - color, 255 - color, 255 - color).getRGB();
         }
      return ia;
   }

   private int iterToInfinity(int i, int j, Dimension d, double x0Real, double x1Real, double y0Real, double y1Real) {
      double xRelative = (double)i / (d.width - 1);
      double yRelative = (double)j / (d.height - 1);
      double xCurrent = x0Real + xRelative * (x1Real - x0Real);
      double yCurrent = y0Real + yRelative * (y1Real - y0Real);

      int iter = 255;
      double x = 0, xTmp = 0, y = 0, yTmp = 0;
      for(int k = 0; k < iter; k++) {
         xTmp = (x * x) - (y * y) + xCurrent;
         yTmp = 2 * x * y + yCurrent;
         x = xTmp;
         y = yTmp;
         if((x * x + y * y) > 4) return k;
      }
      return iter;
   }
}