bot.js

const Bot = require('./lib/Bot');
const SOFA = require('sofa-js');
const Fiat = require('./lib/Fiat');

// -----------------------------------------------------------------------------
// Globals
// -----------------------------------------------------------------------------

const bot = new Bot();

// -----------------------------------------------------------------------------
// Routing
// -----------------------------------------------------------------------------

bot.onEvent = function(session, message) {
  switch (message.type) {
    case 'Init':
      onInit(session);
      break;

    case 'Command':
      onCommand(session, message);
      break;

    case 'Payment':
      onPayment(session, message);
      break;
  }
};

// -----------------------------------------------------------------------------
// Listeners
// -----------------------------------------------------------------------------

function onInit(session) {
  sendMessage(session, 'Hello Token!');
}

function onCommand(session, command) {
  switch (command.content.value) {
    case 'game':
      handleGameStart(session);
      break;

    case 'game:0':
      handleGameResponse(session, 0);
      break;

    case 'game:1':
      handleGameResponse(session, 1);
      break;
  }
}

async function onPayment(session, message) {
  // Ignore payments sent BY the bot
  if (message.fromAddress === session.config.paymentAddress) {
    return;
  }

  // We are only interested on "unconfirmed" messages
  if (message.status !== 'unconfirmed') {
    return;
  }

  handleGamePayment(session);
}

// -----------------------------------------------------------------------------
// Handlers
// -----------------------------------------------------------------------------

async function handleGameStart(session) {
  const res = session.get('res');
  if (res) {
    sendMessage(session, 'Game already in progress!');
    return;
  }

  const toEth = await Fiat.fetch();
  session.requestEth(toEth.EUR(0.1));
  session.set('res', Math.floor(Math.random() * 2));
}

function handleGamePayment(session) {
  const controls = [
    { type: 'button', label: '0', value: '0' },
    { type: 'button', label: '1', value: '1' },
  ];

  const res = session.get('res');
  if (!res) {
    sendMessage(session, 'No game in progress, but thanks for the money');
    return;
  }

  sendMessageKbd(session, 'Choose a binary number ;)', controls);
}

function handleGameResponse(session, response) {
  const res = session.get('res');
  if (!res) {
    sendMessage(session, 'There is no game in progress!');
    return;
  }

  if (response === res) {
    sendMessage(session, 'Congrats! you win ;)');
  } else {
    sendMessage(session, 'Oops, try again!');
  }

  // Clear the result so the user can start again. Note there is no need for a
  // separate variable like "newGame" since "res" can be used for that purpose.
  // Maybe session.delete('res') could work too.
  session.set('res', undefined);
}

// -----------------------------------------------------------------------------
// Helpers
// -----------------------------------------------------------------------------

function sendMessage(session, body) {
  const controls = [{ type: 'button', label: 'Game', value: 'game' }];
  session.reply(SOFA.Message({ body, controls, showKeyboard: false }));
}

function sendMessageKbd(session, body, controls) {
  session.reply(SOFA.Message({ body, controls, showKeyboard: false }));
}