!747

m {
  static new Map<S, S> entries;
  
  static S pattern = "meta * - just got it from the web. snippet * now has md5 * and title *.";
  
  p {
    readLocally("entries");
    print(entries.size() + " entries in cache.");
    makeAndroid("Snippet Cache Bot. v2.");
  }
  
  static void addEntry(S e) {
    entries.put(extractID(e), e); // TODO: compare timestamps
    saveLocally("entries");
  }
  
  static S getEntry(S roughID) {
    S id = formatSnippetID(unquote(roughID));
    S e = entries.get(id);
    if (e == null) {
      // Load from web!
      S title = getSnippetTitle(id);
      S md5 = getSnippetMD5(id);
      e = "meta " + quote(now()) + " - just got it from the web. snippet " + quote(id) + " now has md5 " + quote(md5) + " and title " + quote(title) + ".";
      addEntry(e);
    }
    return e;
  }
  
  static S extractID(S e) {
    new Matches m;
    if (!find3("snippet *", e, m))
      return null;
    return formatSnippetID(unquote(m.m[0]));
  }
  
  static S extractMD5(S e) {
    new Matches m;
    if (!find3("md5 *", e, m))
      return null;
    return unquote(m.m[0]);
  }
  
  static S extractTitle(S e) {
    new Matches m;
    if (!find3("title *", e, m))
      return null;
    return unquote(m.m[0]);
  }
  
  static synchronized S answer(S s) {
    new Matches m;
    
    // put new information in store
    
    if (match3(pattern, s, m)) {
      print("New entry: " + structure(m.m));
      addEntry(s);
      return "OK, stored.";
    }
    
    // retrieve information
    
    if (match3("get md5 of snippet *", s, m))
      return extractMD5(getEntry(m.m[0]));
    
    if (match3("get title of snippet *", s, m)) {
      return extractTitle(getEntry(m.m[0]));
    }
    
    // other commands
    
    if (match3("please consolidate", s, m))
      return "OK, nothing to consolidate.";

    return null;
  }
}