const TaskRouter = require('twilio-taskrouter');
const Twilio = require('twilio');
const AccessToken = Twilio.jwt.AccessToken;
const TaskRouterGrant = AccessToken.TaskRouterGrant;

const accountSid = '';
const signingKeySid = '';
const signingKeySecret = '';
const workspaceSid = '';
const workerSid = '';

const token = createAccessToken(accountSid, signingKeySid, signingKeySecret, workspaceSid, workerSid);
const alice = new TaskRouter.Worker(token);

alice.on('ready', readyAlice => {
    console.log(`Worker ${readyAlice.sid} is now ready for work`);
});

alice.on('reservationCreated', reservation => {
    console.log(`Reservation ${reservation.sid} has been created for ${alice.sid}`);
    console.log(`Task attributes are: ${reservation.task.attributes}`);

    reservation.on('accepted', acceptedReservation => {
      console.log(`Reservation ${acceptedReservation.sid} was accepted.`);
    });

    reservation.accept().then(acceptedReservation => {
      console.log(`Reservation status is ${acceptedReservation.status}`);
    }).catch((err) => {
      console.log(`Error: ${err}`);
    });
});

function createAccessToken(accountSid, signingKeySid, signingKeySecret, workspaceSid, workerSid) {
    const taskRouterGrant = new TaskRouterGrant({
        workerSid: workerSid,
        workspaceSid: workspaceSid,
        role: 'worker'
    });

    const accessToken = new AccessToken(accountSid, signingKeySid, signingKeySecret);
    accessToken.addGrant(taskRouterGrant);
    accessToken.identity = 'alice';

    return accessToken.toJwt();
}