feat(date-memories): add onDateReflectionWritten Cloud Function

functions/src/dates/onDateReflectionWritten.ts

@@ -0,0 +1,94 @@
+import * as functions from 'firebase-functions'
+import * as admin from 'firebase-admin'
+import { recipientInQuietHours } from '../notifications/quietHours'
+
+/**
+ * Fires when a partner writes their post-date reflection
+ * (`couples/{coupleId}/date_reflections/{dateId}/answers/{userId}`). Notifies the OTHER partner — "your
+ * turn to reflect" if they haven't yet, or "ready to reveal together" if both now have. Without this the
+ * second partner never learns to reflect and the mutual reveal stalls. Mirrors `onAnswerWritten`:
+ * generic copy (no decrypted content, no name — the app renders the real name in-app), gated on
+ * `notifPartnerAnswered` + quiet hours (push suppressed in quiet hours, but the in-app record is kept).
+ */
+export const onDateReflectionWritten = functions.firestore
+  .document('couples/{coupleId}/date_reflections/{dateId}/answers/{userId}')
+  .onCreate(async (_snap, context) => {
+    const { coupleId, dateId, userId } = context.params as {
+      coupleId: string
+      dateId: string
+      userId: string
+    }
+    const db = admin.firestore()
+
+    const coupleDoc = await db.collection('couples').doc(coupleId).get()
+    if (!coupleDoc.exists) return
+    const userIds = (coupleDoc.data()?.userIds ?? []) as string[]
+    if (!userIds.includes(userId)) return
+    const partnerId = userIds.find((u) => u !== userId)
+    if (!partnerId) return
+
+    const partnerUserDoc = await db.collection('users').doc(partnerId).get()
+    // Partner-activity opt-out (default on).
+    if (partnerUserDoc.data()?.notifPartnerAnswered === false) {
+      console.log(`[onDateReflectionWritten] ${partnerId} has partner notifications off`)
+      return
+    }
+
+    // Did this complete the pair? If the recipient already reflected, both are done → reveal-ready.
+    const partnerReflection = await db
+      .collection('couples').doc(coupleId)
+      .collection('date_reflections').doc(dateId)
+      .collection('answers').doc(partnerId).get()
+    const bothReflected = partnerReflection.exists
+
+    const title = bothReflected ? 'Your date reflections are ready ✨' : 'Your partner reflected on your date 💭'
+    const body = bothReflected ? 'Open to reveal them together.' : 'Add yours to reveal together.'
+    const type = bothReflected ? 'date_reflection_ready' : 'date_reflection_partner'
+
+    // In-app record (→ Together feed) — written regardless of quiet hours.
+    await db.collection('users').doc(partnerId).collection('notification_queue').add({
+      type, title, body, read: false, createdAt: admin.firestore.FieldValue.serverTimestamp(),
+    })
+
+    // Quiet hours: keep the in-app record, suppress the disruptive push.
+    if (recipientInQuietHours(partnerUserDoc.data())) {
+      console.log(`[onDateReflectionWritten] ${partnerId} in quiet hours — push suppressed (in-app kept)`)
+      return
+    }
+
+    const senderAvatar = (await db.collection('users').doc(userId).get()).data()?.photoUrl
+
+    const tokens: string[] = []
+    const legacy = partnerUserDoc.data()?.fcmToken
+    if (typeof legacy === 'string' && legacy.length > 0) tokens.push(legacy)
+    const tokenSnap = await db.collection('users').doc(partnerId).collection('fcmTokens').get()
+    tokenSnap.docs.forEach((d) => {
+      const t = d.data()?.token
+      if (typeof t === 'string' && t.length > 0 && !tokens.includes(t)) tokens.push(t)
+    })
+    if (tokens.length === 0) return
+
+    const payload: admin.messaging.MessagingPayload = {
+      notification: { title, body },
+      data: {
+        type,
+        couple_id: coupleId,
+        date_id: dateId,
+        ...(typeof senderAvatar === 'string' && senderAvatar.length > 0
+          ? { sender_avatar_url: senderAvatar }
+          : {}),
+      },
+    }
+    const results = await Promise.allSettled(
+      tokens.map((token) =>
+        admin.messaging().send({
+          ...payload,
+          token,
+          android: { notification: { channelId: 'partner_activity' } }, // E-OBS
+        } as admin.messaging.Message)
+      )
+    )
+    results.forEach((r, i) => {
+      if (r.status === 'rejected') console.warn(`[onDateReflectionWritten] FCM failed for ${tokens[i]}:`, r.reason)
+    })
+  })