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abstract sclass DynTalkBot > DynDiscordHopper {
  switchable S myName = "Anonymous bot";
  transient bool useAGIBlueForDropPunctuation = true;
  L<Long> authorizedUsers = ll(463778175432785932, 545983823997960193);
  
  start {
    dm_vmBus_onMessage_q('discordGuildJoin, voidfunc(Map map) {
      ret unless map.get('module) == module();
      print("Got join");
      onUserJoin(getLong userID(map), map);
    });
  }
  
  // overridable
  void onUserJoin(long userID, O... _) {}
  
  @Override S answer(S input, Map map) {
    ret mapEachLine_tlft_nempties(input, s -> {
      ret processLine(s, map);
    });
  }
  
  S processLine(S s, O... _) {
    s = preprocess(s, _);
    ret processSimplifiedLine(s, _);
  }
  
  S preprocess(S s, O... _) {
    if (discordBotID != 0)
      s = replace(s, discordAt(discordBotID), " " + myName + " ");
    s = dropPunctuation3_withAGIBlue(useAGIBlueForDropPunctuation, s);
    s = trim(simpleSpaces_noTok(s));
    print("simplified >> " + quote(s));
    ret s;
  }
  
  // extend me
  S processSimplifiedLine(S s, O... _)
    if (swic_trim(input, prefix + "add master ", m)) {
      if (!contains(authorizedUsers, userID)) ret "You are not my master";
        
      add(authorizedUsers, parseFirstLong(m.rest()));
      change();
      
      ret "Okidoki. Have " + n2(l(authorizedUsers), "master");
    }
    
    null;
  }
}