auth, trips and join trips

server/repositories/participant.repo.ts

@@ -0,0 +1,28 @@
+import { prisma } from "@/lib/prisma";
+
+export const participantRepo = {
+  async findByTripAndUser(tripId: string, userId: string) {
+    return prisma.tripParticipant.findUnique({
+      where: { tripId_userId: { tripId, userId } },
+    });
+  },
+
+  async create(tripId: string, userId: string) {
+    return prisma.tripParticipant.create({
+      data: { tripId, userId, status: "CONFIRMED" },
+    });
+  },
+
+  async countByTrip(tripId: string) {
+    return prisma.tripParticipant.count({
+      where: { tripId, status: { not: "CANCELLED" } },
+    });
+  },
+
+  async cancel(tripId: string, userId: string) {
+    return prisma.tripParticipant.update({
+      where: { tripId_userId: { tripId, userId } },
+      data: { status: "CANCELLED" },
+    });
+  },
+};