package NET.worlds.scape;

import java.io.IOException;

public class SameRoomSensor extends Sensor implements FrameHandler {
   private Room lastCamRoom;
   private static Object classCookie = new Object();

   public SameRoomSensor(Action a) {
      if (a != null) {
         this.addAction(a);
      }
   }

   public SameRoomSensor() {
   }

   @Override
   public void detach() {
      this.lastCamRoom = null;
      super.detach();
   }

   @Override
   public boolean handle(FrameEvent e) {
      Object owner = this.getOwner();
      if (owner != null && owner instanceof WObject) {
         WObject o = (WObject)owner;
         Room thisRoom = o.getRoom();
         Room thisCamRoom = Pilot.getActiveRoom();
         if (thisCamRoom == thisRoom && this.lastCamRoom != thisCamRoom) {
            this.trigger(e);
         }

         this.lastCamRoom = thisCamRoom;
         return true;
      } else {
         return true;
      }
   }

   @Override
   public void saveState(Saver s) throws IOException {
      super.saveState(s);
      s.saveVersion(0, classCookie);
   }

   @Override
   public void restoreState(Restorer r) throws IOException, TooNewException {
      int vers = super.restoreStateVers(r);
      if (vers > 1) {
         switch (r.restoreVersion(classCookie)) {
            case 0:
               return;
            default:
               throw new TooNewException();
         }
      }
   }
}