feat(api): support user participant invitation when creating events

src/app/api/event/route.ts

@@ -10,10 +10,24 @@ const postEventSchema = z
     start_time: z.iso.datetime(),
     end_time: z.iso.datetime(),
     location: z.string().optional().default(''),
+    participants: z.array(z.string()).optional(),
   })
   .refine((data) => new Date(data.start_time) < new Date(data.end_time), {
     error: 'Start time must be before end time',
-  });
+  })
+  .refine(
+    async (data) =>
+      !data.participants ||
+      (await Promise.all(
+        data.participants.map(async (userId) => {
+          const user = await prisma.user.findUnique({ where: { id: userId } });
+          return !!user;
+        }),
+      ).then((results) => results.every(Boolean))),
+    {
+      error: 'One or more participant user IDs are invalid',
+    },
+  );
 
 /**
  * @swagger
@@ -154,6 +168,11 @@ export const GET = auth(async (req) => {
  *                 format: date-time
  *               location:
  *                 type: string
+ *               participants:
+ *                 type: array
+ *                 items:
+ *                   type: string
+ *                   description: User ID of a participant
  *     responses:
  *       200:
  *         description: Event created successfully.
@@ -215,7 +234,8 @@ export const POST = auth(async (req) => {
       { status: 400 },
     );
   }
-  const { title, description, start_time, end_time, location } = data.data;
+  const { title, description, start_time, end_time, location, participants } =
+    data.data;
 
   const newEvent = await prisma.meeting.create({
     data: {
@@ -225,6 +245,13 @@ export const POST = auth(async (req) => {
       end_time,
       location,
       organizer_id: req.auth.user.id,
+      participants: participants
+        ? {
+            create: participants.map((userId) => ({
+              user: { connect: { id: userId } },
+            })),
+          }
+        : undefined,
     },
     select: {
       id: true,