import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class Midlet extends MIDlet implements CommandListener {

 private static Midlet instance;
 private static Display display;
 private Emulator emul;
 private Form form;
 private Command ok = new Command("Ok", Command.OK, 0);

 public void startApp() {
  initApp();
 }

 public void initApp() {
  instance = this;
  display = Display.getDisplay(this);
  form = new Form("CHIP-8 Emulator");

  try {
   display.setCurrent(form);
   form.append("Loading...");
   emul = new Emulator();
   emul.loadGame();
   if(emul.gameLoaded) {
    form.deleteAll();
    form.append("Game loaded!");
    form.addCommand(ok);
    form.setCommandListener(this);
   }
  } catch (Throwable t) {
   displayError(t.toString().concat(" at Midlet"));
  }
 }

 public void pauseApp() {
 }

 public void commandAction(Command c, Displayable d) {
  if(c == ok) display.setCurrent(emul);
 }

 public void destroyApp(boolean unconditional) {
 }

 public static Midlet getInstance() {
  return instance;
 }

 public void displayMessage(String message) {
  form.append(message);
  display.setCurrent(form);
 }

 public void displayError(String error) {
  form.append("Error:".concat(error));
  display.setCurrent(form);
 }
}