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asclass DynServerAwareDiscordBot<A extends DynServerAwareDiscordBot.ByServer> extends DynDiscordHopper {
  new Map<Long, A> dataByServer;
  int guildCount;
  transient IF0<A> makeByServer; // mandatory
  
  sclass ByServer {
    DynModule module;
    bool isGuild;
    
    *() {}
    *(DynModule *module) {}
    
    S answer(S s, Map map) { null; }

    bool setField(S name, O value) {
      if (set_trueIfChanged(this, name, value)) false;
      ret true with module._change();
    }
  }
  
  @Override S answer(S input, Map map) {
    // no super (no discord hopping)
    
    ret mapEachLine_tlft_nempties(input, s -> {
      // config by guild or user
      long guildID = toLong(map.get('guildID));
      long id = guildID;
      print("Guild ID: " + guildID);
      if (id == 0) {
        id = toLong(map.get('userID));
        print("User ID: " + id);
      }
      
      A data, bool isNew = unpair getByServer(id, id == guildID);
      ret data.answer(s, map);
    });
  }
  
  Pair<A, Bool> getByServer(long guildID, bool isGuild) {
    A data, bool isNew = unpair syncGetOrCreate2(dataByServer, id, makeByServer);
    data.isGuild = isGuild;
    if (isNew) {
      if (data.isGuild) ++guildCount;
      change();
    }
    ret pair(data, isNew);
  }
  
  start {
    if (guildCount == 0)
      setField(guildCount := countValuesWhere(dataByServer, isGuild := true));
  }
}