// Logic: Checks every 5 minutes and clears full cache when
// anything changed in the DB. So it's as good as traffic-free
// when the DB is not changing.

!7

static int updateInterval = 5*60000;
static long lastVersionCount;

static new Map<S, S> titles;

p {
  startBot("Version Count Bot", "#1001745");
  makeAndroid3("Snippet Title Bot.");
  updateLoop();
}

static void update() {
  new Matches m;
  if (match3("version count: *", sendToLocalBot_cached("Version Count Bot", "get version count"), m)) {
    long count = parseLong(m.get(0));
    if (count != lastVersionCount) {
      lastVersionCount = count;
      clear();
    }
  }
}

static synchronized S answer(S s) {
  new Matches m;
  if (match3("what is the title of snippet *", s, m)) {
    S snippetID = formatSnippetID(m.unq(0));
    S title = titles.get(snippetID);
    if (title == null) {
      title = getSnippetTitle(snippetID);
      if (title == null) ret "null";
      titles.put(snippetID, title);
    }
    ret format("The title of snippet * is *.", snippetID, title);
  }
  
  if (match3("clear snippet title cache", s, m)) {
    clear();
    ret "OK.";
  }
  
  if (match3("get snippet title cache size", s, m)) {
    ret "Cache entries: " + titles.size();
  }
  
  ret null;
}

static synchronized void clear() {
  titles.clear();
}