Webhooks

import express from 'express';
import { Webhook } from 'svix';

const app = express();

app.post('/webhooks/intelliprint', 
  express.raw({ type: 'application/json' }),
  (req, res) => {
    const webhookSecret = process.env.SVIX_WEBHOOK_SECRET;
    const webhook = new Webhook(webhookSecret);
    
    let event;
    
    try {
      // Verify webhook signature
      event = webhook.verify(req.body, {
        'svix-id': req.headers['svix-id'],
        'svix-timestamp': req.headers['svix-timestamp'],
        'svix-signature': req.headers['svix-signature']
      });
    } catch (err) {
      console.error('Webhook verification failed:', err);
      return res.status(400).send('Invalid signature');
    }
    
    // Handle the event
    switch (event.type) {
      case 'letter.updated':
        console.log(`Letter ${event.data.id} updated: ${event.data.status}`);
        
        // Handle different letter statuses
        switch (event.data.status) {
          case 'sent':
            // Letter dispatched to Royal Mail
            console.log(`Letter dispatched. Tracking: ${event.data.tracking_number}`);
            break;
          case 'returned':
            // Letter returned
            console.log(`Letter returned: ${event.data.returned.reason}`);
            break;
          case 'failed_wrong_address':
            // Delivery failed
            console.log('Delivery failed - wrong address');
            break;
        }
        break;
        
      case 'mailing_list.addresses_validated':
        console.log(`Mailing list ${event.data.id} validated`);
        console.log(`Passed: ${event.data.address_validation.recipients.passed}`);
        console.log(`Failed: ${event.data.address_validation.recipients.failed}`);
        break;
        
      default:
        console.log(`Unhandled event type: ${event.type}`);
    }
    
    // Return 200 to acknowledge receipt
    res.sendStatus(200);
  }
);

app.listen(3000);