static class MouseMover {
  Pt cur, last;
  Robot robot;
  java.util.Timer timer;
  int interferenceMinDistance = 100;
  int mouseCheckInterval = 50;
  int blockTimeAfterInterference = 5000; // ms
  bool endAfterInterference = true;
  volatile bool interference;
  long blockUntil;
  
  synchronized bool enabled() { ret timer != null; }
  
  synchronized void enable() ctex {
    if (robot == null) robot = new Robot;
    if (timer == null) {
      interference = false;
      cur = new Pt(mouseLocation());
      timer = new java.util.Timer("MouseMover");
      timer.scheduleAtFixedRate(new TimerTask {
        public void run() {
          checkMouse();
        }
      }, mouseCheckInterval, mouseCheckInterval);
      print("Mouse automation started");
    }
  }
  
  bool farAway(Pt a, Pt b) {
    ret pointDistance(a, b) >= interferenceMinDistance;
  }
  
  synchronized void checkMouse() {
    if (!enabled()) ret;
    Pt p = new Pt(mouseLocation());
    if (farAway(p, cur) && neq(p, last)) {
      interference = true;
      if (endAfterInterference) {
        print("Mouse interference detected, stopping automation");
        disable();
      } else {
        bool blockedAlready = blocked();
        blockUntil = now()+blockTimeAfterInterference;
        if (!blockedAlready)
          print("Mouse automation blocked for at least " + blockTimeAfterInterference + " ms");
        cur = new Pt(mouseLocation());
      }
    }
  }
  
  synchronized void disable() {
    if (timer != null) {
      timer.cancel();
      timer = null;
      if (!interference)
        print("Mouse automation ended without interference");
    }
  }
  
  synchronized void moveMouseImmediate(Pt p) {
    checkMouse();
    if (!enabled() || blocked()) ret;
    p = normalizePointToScreen(p);
    if (neq(cur, p)) {
      if (neq(new Pt(mouseLocation()), last))
        last = cur;
      cur = p;
      robot.mouseMove(p.x, p.y);
    }
  }
  
  synchronized bool hasInterference() {
    ret interference;
  }
  
  synchronized bool blocked() {
    if (!enabled() || blockUntil == 0) false;
    if (now() < blockUntil) true;
    blockUntil = 0;
    cur = new Pt(mouseLocation());
    print("Mouse automation resumes");
    false;
  }
}