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// Logic: Checks every 20 seconds 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

m {
  static int updateInterval = 20000;
  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();
  }
}