add/delete entry in google calendar

db/booking.ts

@@ -1,6 +1,7 @@
 import * as mongoose from 'mongoose'
 import { v4 as uuidv4 } from 'uuid'
 import { dateFormatBackend, getDays, nowInTz } from '../helpers/date'
+import { createCalendarEvent, deleteCalendarEvent } from '../lib/googlecalendar'
 
 import { Bill } from './bill'
 import { BOOKING_STATUS, VALIDATION_ERRORS } from './enums'
@@ -21,7 +22,8 @@ export type Booking = {
   purpose?: string
   org?: string
   destination?: string
-  days?: string[]
+  days?: string[],
+  calendarEventId: string,
 }
 
 export type BookingDocument = Booking &
@@ -103,6 +105,7 @@ const BookingSchema = new mongoose.Schema<BookingDocument>(
     purpose: { type: String, required: false },
     org: { type: String, required: false },
     destination: { type: String, required: false },
+    calendarEventId: { type: String, required: false },
   },
   {
     timestamps: true,
@@ -120,6 +123,20 @@ BookingSchema.pre('validate', function (next: () => void): void {
   next()
 })
 
+BookingSchema.pre('save', async function (next: () => void): Promise<void> {
+  const booking = this as BookingDocument
+
+  if (!booking.calendarEventId) {
+    // create calendar event before saving to database
+    await createCalendarEvent(booking);
+  } else if ([BOOKING_STATUS.CANCELED, BOOKING_STATUS.REJECTED].includes(booking.status)) {
+    // event has been canceled or rejected, delete calendar event again to free up the slot
+    await deleteCalendarEvent(booking);
+  }
+
+  next();
+});
+
 BookingSchema.static('findBookedDays', async function (
   uuidsToIngore: string[] = []
 ): Promise<string[]> {