// Webhook handler for payin status updates
app.post('/webhook/payin', async (req, res) => {
  const { id, invoice, status, updated_at } = req.body;
  
  console.log(`Received webhook for charge ${id}`);
  console.log(`Invoice: ${invoice}`);
  console.log(`Status: ${status.name} (${status.id})`);
  
  switch (status.id) {
    case 5: // Credited
      console.log('✓ Payment successful and credited');
      await processSuccessfulPayment(id, invoice);
      break;
      
    case 3: // Rejected
      console.log('✗ Payment rejected by compliance');
      await handleRejectedPayment(id, invoice);
      break;
      
    case 2: // Canceled
      console.log('⊘ Payment canceled or expired');
      await handleCanceledPayment(id, invoice);
      break;
      
    default:
      console.log(`Unexpected status: ${status.name}`);
  }
  
  // Always respond 200 OK to acknowledge webhook receipt
  res.status(200).json({ received: true });
});

async function processSuccessfulPayment(chargeId, invoice) {
  // Update order status
  await updateOrderStatus(invoice, 'paid');
  
  // Send confirmation email
  await sendConfirmationEmail(invoice);
  
  // Trigger fulfillment
  await triggerFulfillment(invoice);
}

async function handleRejectedPayment(chargeId, invoice) {
  // Get rejection reason
  const charge = await getCharge(chargeId);
  const rejectionReason = charge.substatus?.name;
  
  // Notify customer
  await notifyCustomer(invoice, 'rejected', rejectionReason);
  
  // Update order status
  await updateOrderStatus(invoice, 'payment_failed');
}

async function handleCanceledPayment(chargeId, invoice) {
  // Update order status
  await updateOrderStatus(invoice, 'canceled');
  
  // Notify customer
  await notifyCustomer(invoice, 'canceled');
}