also add mail when user cancels

helpers/mail.ts

@@ -64,10 +64,11 @@ einsehen und stornieren.
 ${footer}
 `
 }
+
 function getBookingRejectedText(booking: Booking): string {
   return `Hallo liebe/r ${booking.name},
 
-es tut uns leid aber deine Buchungsanfrage zum ${daysFormatFrontend(
+es tut uns leid, aber deine Buchungsanfrage zum ${daysFormatFrontend(
     booking.days
   )} konnten wir leider nicht bestätigen.
 
@@ -78,6 +79,18 @@ ${footer}
 `
 }
 
+function getBookingCanceledText(booking: Booking): string {
+  return `Hallo liebe/r ${booking.name},
+
+deine Buchungsanfrage zum ${daysFormatFrontend(booking.days)} wurde storniert.
+
+Willst du das Bussle an einem anderen Termin buchen? Dann stelle bitte nochmal
+eine Buchungsanfrage auf ${getBaseURL()}.
+
+${footer}
+`
+}
+
 function getReceivedBookingAdminText(booking: { uuid: string }): string {
   return `Hallo lieber Admin,
 
@@ -163,6 +176,22 @@ export async function sendBookingRejected(booking: Booking): Promise<void> {
   }
 }
 
+export async function sendBookingCanceled(booking: Booking): Promise<void> {
+  try {
+    await sendMail({
+      to: [{ email: booking.email, name: booking.name }],
+      from: { email: FROM_EMAIL, name: 'Pfadi-Bussle Wart' },
+      subject: `Deine Pfadi-Bussle Buchung wurde storniert!`,
+      textPlainContent: getBookingCanceledText(booking),
+    })
+  } catch (error) {
+    console.error(
+      `Failed in sendBookingCanceledMail for ${booking.uuid}`,
+      error
+    )
+  }
+}
+
 async function sendMail({
   to,
   from,

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

@@ -1,29 +1,37 @@
 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,
+  sendBookingCanceled,
 } from '../../../../helpers/mail'
 
 function changedStatus(
-  booking: Booking,
-  updates: Partial<Booking>,
+  previous: Booking,
+  current: Partial<Booking>,
   status: BOOKING_STATUS
 ): boolean {
   return (
-    [BOOKING_STATUS.REQUESTED].includes(booking.status) &&
-    updates.status === status
+    [BOOKING_STATUS.REQUESTED].includes(previous.status) &&
+    current.status === status
   )
 }
-function wasRejected(booking: Booking, updates: Partial<Booking>): boolean {
-  return changedStatus(booking, updates, BOOKING_STATUS.REJECTED)
+function wasRejected(previous: Booking, current: Partial<Booking>): boolean {
+  return changedStatus(previous, current, BOOKING_STATUS.REJECTED)
 }
 
-function wasConfirmed(booking: Booking, updates: Partial<Booking>): boolean {
-  return changedStatus(booking, updates, BOOKING_STATUS.CONFIRMED)
+function wasConfirmed(previous: Booking, current: Partial<Booking>): boolean {
+  return changedStatus(previous, current, BOOKING_STATUS.CONFIRMED)
+}
+
+function wasCanceled(previous: Booking, current: Partial<Booking>): boolean {
+  return (
+    [BOOKING_STATUS.REQUESTED, BOOKING_STATUS.CONFIRMED].includes(
+      previous.status
+    ) && current.status === BOOKING_STATUS.CANCELED
+  )
 }
 
 export default async function userHandler(
@@ -58,6 +66,8 @@ export default async function userHandler(
           sendBookingRejected(current)
         } else if (wasConfirmed(previous, current)) {
           sendBookingConfirmed(current)
+        } else if (wasCanceled(previous, current)) {
+          sendBookingCanceled(current)
         }
 
         res.status(200).json(current)