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!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.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("Text: " + text);
          S response = "You typed " + n2(l(text), "character");
          Chat chat = msg.getChat();
          
          new SendMessage sending;
          sending.setText(response);
          sending.setChatId(msg.getChatId());
          sendMessage(sending);
        }
      }
    }
  };

  new TelegramBotsApi api;
  api.registerBot(bot);
}