Telegram bot for choice-based games

atrament-bot.js

const fs = require('fs');
const TelegramBot = require('node-telegram-bot-api');
const atrament = require('./atrament');

const token = 'SECRET-TOKEN-HERE';

const bot = new TelegramBot(token, {polling: true});

let chatId;
const kbdMessage = {};

const gameConfig = {
  episodes: [
    'capsule.ink.json'
  ]
};

function fileLoader(filename) {
  return new Promise((resolve) => {
    fs.readFile(filename, (err, data) => {
      resolve(data);
    });
  });
}

function sendMessageWithKbd (chatId, text, inline_keyboard) {
  bot.sendMessage(chatId, text, { parse_mode: 'Markdown' })
  .then(() => bot.sendMessage(chatId, '-', {
    parse_mode: 'Markdown',
    one_time_keyboard: true,
    reply_markup: {
      inline_keyboard
    }
  })).then((msg) => {
    kbdMessage[chatId] = msg.message_id;
  });
}

atrament.init(gameConfig);
atrament.on('loadStory', fileLoader);
atrament.on('error', (e) => console.error(e));

atrament.registerCommand(
  'CLEAR',
  () => { return false; }
);

function renderScene() {
  const scene = atrament.renderScene();
  let sceneText = scene.text.join('');
  if (!sceneText) {
    sceneText = '.';
  }
  if (!scene.choices.length) {
    // game over
    return;
  }
  const choices = scene.choices.map(
    (t) => ([{text:t.choice, callback_data:t.id}])
  );
  sendMessageWithKbd(chatId, sceneText, choices);
}

bot.on('message', (msg) => {
  chatId = msg.chat.id;
  if (msg.text === '/start') {
    atrament.startGame().then(renderScene);
  } else {
    bot.sendMessage(chatId, 'Say "/start" to start game.')
  }
});

bot.on('callback_query', (res) => {
  chatId = res.message.chat.id;
  if (kbdMessage[chatId]) {
    bot.deleteMessage(chatId, kbdMessage[chatId]).then(() => kbdMessage[chatId] = null);
  }
  atrament.makeChoice(res.data);
  renderScene();
});