// Reversi.java

import RevState;
import java.awt.*;
import java.applet.*;

public class Reversi extends Applet {
  private RevState state;
  private static int level = 0;
  
  public Color getBackground () {
    return Color.lightGray;
  }

  public void paint (Graphics g) {
	state.paint (this, g);
  }

  void reset (int color) {
      if (color == RevState.RED) {
      state.reset (RevState.RED); // Computer beginnt
      state = (RevState) state.bestMove (level);
    }
    else state.reset (RevState.BLUE); // Spieler beginnt
    repaint();
  }

  Choice choice;

  public void init () {
    add (new Label ("Stärke"));
    choice = new Choice ();
    for (int i=0; i<=5; i++) choice.addItem (String.valueOf (i));
    choice.select (level);
    add (choice);
    add (new Label ("Neues Spiel:"));
    add (new Button ("Computer"));
    add (new Button ("Mensch"));
    state = new RevState ();
    reset (RevState.BLUE);
  }

  public boolean action (Event evt, Object arg) {
    if (evt.target == choice) {
      level = new Integer ((String) arg).intValue ();
      reset (RevState.BLUE);
    }
    else if ("Computer".equals (arg)) {
      reset (RevState.RED);
      return true;
    }
    else if ("Mensch".equals(arg)) {
      reset (RevState.BLUE);
      return true;
    }
    repaint();
    return false;
  }

  public boolean mouseDown (Event evt, int x, int y) {
    x = state.column (x);
    y = state.row (y);
    if (state.isValidMove (x,y,RevState.BLUE)) {
      state.doMove (x,y);
      repaint();
      if (state.nMoves () > 0) {
        RevState s2 = (RevState) state.bestMove(level);
        if(s2.activeColor == state.activeColor)
          s2.activeColor = -s2.activeColor;
        state = s2;
        repaint();
      }
    }
    return true;
  }

  public String getAppletInfo () {
    return "Reversi (M.H., D.R., J.S. '97), basiert auf 'Vier gewinnt' (H.R. '96)";
  }
}