// The online bot LOVES to be online.

!747

m {
  // -1, 0, +1
  static new AtomicInteger online;
  static new AtomicLong nextCheck;
  static S lastProblem;
  
  p {
    makeAndroid("Online bot! " + getStatus(), stringfunc { answer(s) });

    while (true) {
      check();
      long seconds = online.get() > 0 ? 60 : 2;
      nextCheck.set(now() + seconds*1000);
      sleep(Math.max(nextCheck.get()-now(), 0));
    }
  }
  
  // We should add a timeout I guess? Although, if actually offline,
  // it doesn't block, so it's probably ok unless the net or the
  // server is currently very slow.
  static synchronized void check() {
    int oldValue = online.get();
    Throwable problem = checkIfHttpServerIsOnline("tinybrain.de");
    int value = problem == null ? 1 : -1;
    if (problem == null)
      lastProblem = null;
    else if (!problem.toString().equals(lastProblem)) {
      print(problem);
      lastProblem = problem.toString();
    }
    online.set(value);
    if (value != oldValue)
      print(getStatus());
  }
  
  static synchronized S answer(S s) {
    if (match3("are we online?", s))
      return getStatus();
    if (match3("check again", s)) {
      print("Checking...");
      check();
      return getStatus();
    }
    return null;
  }
  
  static S getStatus() {
    int i = online.get();
    long checkSeconds = (nextCheck.get()-now())/1000;
    S checkTime = checkSeconds >= 0 ? "(Next check in " + checkSeconds + " seconds.)" : "";
    if (i < 0) return "We are: OFFLINE. " + checkTime;
    else if (i > 0) return "We are: ONLINE. " + checkTime;
    else return "Online status check in progress.";
  }
}