working on onboarding flow

apps/admin/src/app/api/users/gym/route.ts

@@ -0,0 +1,55 @@
+import { NextResponse } from 'next/server'
+import { auth } from '@clerk/nextjs/server'
+import { db, users as usersTable, gyms as gymsTable, eq } from '@fitai/database'
+
+/**
+ * PATCH /api/users/gym
+ * Body: { gymId: string | null }
+ * - Updates the current authenticated user's gym selection.
+ * - gymId can be null to proceed without a gym.
+ * - If gymId is provided, it must exist and be active.
+ */
+export async function PATCH(req: Request) {
+  try {
+    const { userId } = await auth()
+    if (!userId) return new NextResponse('Unauthorized', { status: 401 })
+
+    const body = await req.json().catch(() => null)
+    if (!body || typeof body !== 'object' || !('gymId' in body)) {
+      return NextResponse.json({ error: 'gymId is required in body (can be null)' }, { status: 400 })
+    }
+
+    const gymId = body.gymId === null ? null : String(body.gymId)
+
+    // Ensure user exists
+    const user = await db.select().from(usersTable).where(eq(usersTable.id, userId)).get()
+    if (!user) return new NextResponse('User not found', { status: 404 })
+
+    // Validate gym when provided
+    if (gymId) {
+      const gym = await db.select().from(gymsTable).where(eq(gymsTable.id, gymId)).get()
+      if (!gym) {
+        return NextResponse.json({ error: 'Gym not found' }, { status: 404 })
+      }
+      if (gym.status !== 'active') {
+        return NextResponse.json({ error: 'Gym is not active' }, { status: 400 })
+      }
+    }
+
+    // Update user's gym selection
+    await db
+      .update(usersTable)
+      .set({
+        gymId: gymId ?? null,
+        updatedAt: new Date(),
+      })
+      .where(eq(usersTable.id, userId))
+      .run()
+
+    const updated = await db.select().from(usersTable).where(eq(usersTable.id, userId)).get()
+    return NextResponse.json(updated)
+  } catch (error) {
+    console.error('PATCH /users/gym error:', error)
+    return new NextResponse('Internal Server Error', { status: 500 })
+  }
+}