import * as express from 'express';
import * as admin from 'firebase-admin';

// Our endpoint for handling the Typeform Webhook.
export const webhook = async (request: express.Request, response: express.Response) => {
  const submission = request.body;

  // This is our initial postcard, we will fill it out as we continue...
  const postcard = {
    sender: {},
    recipient: {}
  };

  // Here we parse out details from the form submission. By using an answers `ref` we map the response to in our postcard object.
  submission.form_response.answers.forEach((answer: any) => {
    const ref = answer['field']['ref'];
    switch (ref) {
      case 'sender-name':
        order['sender']['name'] = answer.text;
      case 'sender-email':
        order['sender']['email'] = answer.email;
      case 'recipient-name':
        order['recipient']['name'] = answer.text;
        break;
      default:
        break;
    }
  });

  // We will now save the postcard into a collection for our reference
  return admin.firestore().collection('orders').add(postcard)
    // We also will create a status document to keep a sender up to date on their order
    .then((ref) => admin.firestore().collection('status').doc(ref.id).set({
      lastUpdated: new Date(),
      message: 'Order to be sent to Lob',
      email: order.sender.email,
    }))
    .then(() => response.status(200).send({ success: true }));
}

import * as admin from 'firebase-admin';
import * as functions from 'firebase-functions';
import { readFileSync } from 'fs';
import { join } from 'path';

const Lob = require('lob')('<YOUR-LOB-API-KEY-HERE>');

// The front and the back of postcards being sent can be stored/created as HTML files, with variables swapped in by Lob
const POSTCARD_FRONT: string = readFileSync(join(__dirname, 'templates', 'front.html'), 'utf8');
const POSTCARD_BACK: string = readFileSync(join(__dirname, 'templates', 'back.html'), 'utf8');

// This function will be triggered whenever a new document is created in the `order` collection. So when the above `webhook` function resolves, this function is automatically triggered.
export const ordersOnCreate = functions.firestore.document('orders/{id}').onCreate((snapshot, context) => {
  const id = context.params.id;
  const postcard = snapshot.data();

  // Let's send the order to Lob for printing!
  return Lob.postcards.create({
    description: `Typeform 💌 Lob - ${id}`,
    to: {
      name: postcard.recipient.name,
      address_line1: postcard.recipient.address,
      address_line2: '',
      address_city: postcard.recipient.city,
      address_state: postcard.recipient.state,
      address_zip: postcard.recipient.zip
    },
    from: {
      name: postcard.sender.name,
      address_line1: postcard.sender.address,
      address_line2: '',
      address_city: postcard.sender.city,
      address_state: postcard.sender.state,
      address_zip: postcard.sender.zip
    },
    front: POSTCARD_FRONT,
    back: POSTCARD_BACK,
    merge_variables: {
      // This is a variable that will be swapped into out postcard HTML templates
      message: postcard.message
    }
  }, (error: any, success: any) => {
    if (error) {
      // If we are unable to send the order to Lob we will update our status with an error
      admin.firestore().collection('status').doc(id).update({
        error: true,
        message: 'Your order could not be sent to Lob',
        lastUpdated: new Date()
      });
    } else {
      // If successful we will update the order status accordingly
      admin.firestore().collection('status').doc(id).update({
        error: false,
        message: 'Your order has been successfully sent to Lob',
        completed: true,
        lastUpdated: new Date(),
        sent: success
      });
    }
  });
});

import * as functions from 'firebase-functions';
import * as Mailgun from 'mailgun-js';

const mailgun = Mailgun({
  apiKey: '<YOUR-MAILGUN-API-KEY-HERE>',
  domain: '<YOUR-MAILGUN-DOMAIN-HERE>'
});

// This function will be triggered whenever a status is created
export const statusOnCreate = functions.firestore.document('status/{statusId}').onCreate((snapshot, context) => {
  // First we parse out the ID of the status document (it should match the order's ID)
  const id = context.params.statusId;
  // Then we parse out the status document
  const status = snapshot.data();
  // We then send the status and id to our `sendEmail` function that will handle sending the email
  return sendEmail(status, id);
});

// This function will be triggered whenever a status is changed (updated)
export const statusOnUpdate = functions.firestore.document('status/{statusId}').onUpdate((change, context) => {
  // Here we just ensure it's an update and not a delete
  if (!change.after) { return Promise.resolve(); }
  const id = context.params.statusId;
  const status = change.after.data();
  return sendEmail(status, id);
});

// All we do here is send the email via Mailgun
function sendEmail(status: any, id: string): Promise<any> {
  return mailgun.messages().send({
    from: 'support@typeform.com',
    to: status.email,
    subject: `Typeform 💌 Lob - Order ${id} Update`,
    text: `${status.message} \n View order at https://typeform-lob.firebaseapp.com/order?id=${id}`
  });
}

git clone https://github.com/MichaelSolati/typeform-lob.git
cd typeform-lob
npm i
npm run start