fix sending reject and confirmation mails

pages/api/bookings/[uuid]/index.ts

@@ -1,6 +1,30 @@
 import { NextApiRequest, NextApiResponse } from 'next'
+import Book from '../../../../components/book'
+import { Booking } from '../../../../db/booking'
 import { BOOKING_STATUS } from '../../../../db/enums'
 import { patchBooking } from '../../../../db/index'
+import {
+  sendBookingConfirmed,
+  sendBookingRejected,
+} from '../../../../helpers/mail'
+
+function changedStatus(
+  booking: Booking,
+  updates: Partial<Booking>,
+  status: BOOKING_STATUS
+): boolean {
+  return (
+    [BOOKING_STATUS.REQUESTED].includes(booking.status) &&
+    updates.status === status
+  )
+}
+function wasRejected(booking: Booking, updates: Partial<Booking>): boolean {
+  return changedStatus(booking, updates, BOOKING_STATUS.REJECTED)
+}
+
+function wasConfirmed(booking: Booking, updates: Partial<Booking>): boolean {
+  return changedStatus(booking, updates, BOOKING_STATUS.CONFIRMED)
+}
 
 export default async function userHandler(
   req: NextApiRequest,
@@ -27,8 +51,16 @@ export default async function userHandler(
       }
 
       try {
-        const booking = await patchBooking(uuid, req.body)
-        res.status(200).json(booking)
+        const { current, previous } = await patchBooking(uuid, req.body)
+
+        // TODO: this should really go into the schema
+        if (wasRejected(previous, current)) {
+          sendBookingRejected(current)
+        } else if (wasConfirmed(previous, current)) {
+          sendBookingConfirmed(current)
+        }
+
+        res.status(200).json(current)
       } catch (error) {
         console.error('failed patch booking', error)
         res.status(400).end(`Failed to save booking: ${error.message}`)