!7

lib 1400113 // TelegramBots

import org.telegram.telegrambots.*;
import org.telegram.telegrambots.bots.*;
import org.telegram.telegrambots.api.objects.Update;
import org.telegram.telegrambots.api.objects.Message;
import org.telegram.telegrambots.api.objects.Chat;
import org.telegram.telegrambots.api.objects.User;
import org.telegram.telegrambots.api.methods.send.SendMessage;

p-exp {
  fS apiToken = trim(loadTextFileMandatory(javaxSecretDir("telegram-bot-token.txt")));

  ApiContextInitializer.init();
  TelegramLongPollingBot bot = new TelegramLongPollingBot {
    public S getBotUsername() { ret "HelloComputer_bot"; }
    public S getBotToken() { ret apiToken; }
    
    public void onUpdateReceived(Update update) {
      pcall {
        print("Got update! " + update);
        Message msg = update.getChannelPost();
        if (msg != null && msg.hasText()) {
          S text = msg.getText();
          print("Incoming text: " + text);
          S response;
          try {
            response = makeResponse(text, msg);
          } catch e {
            printStackTrace(e);
            response = exceptionToStringShort(e);
          }
          if (empty(response)) ret;
          Chat chat = msg.getChat();
          
          new SendMessage sending;
          sending.setText(response);
          sending.setChatId(msg.getChatId());
          sendMessage(sending);
        }
      }
    }
  };

  new TelegramBotsApi api;
  api.registerBot(bot);
}

static S makeResponse(S s, Message msg) {
  if (eqic(s, "whoami")) {
    User from = msg.getFrom();
    if (from == null) ret "idk";
    ret msg.getFrom().getId() + " / " + msg.getFrom().getUserName();
  }
    
  S response = "You typed " + n2(l(s), "character");
  ret response;
}