feat: partner leave notification, real-time couple state sync, in-app unpair alerts

app/src/main/java/app/closer/core/notifications/AppMessagingService.kt

@@ -79,6 +79,7 @@ class AppMessagingService : FirebaseMessagingService() {
 
                 val channelId = when (type) {
                     "partner_answered" -> NotificationHelper.CHANNEL_PARTNER
+                    "partner_left" -> NotificationHelper.CHANNEL_PARTNER
                     "daily_question", "streak" -> NotificationHelper.CHANNEL_REMINDERS
                     else -> NotificationHelper.CHANNEL_REMINDERS
                 }
@@ -97,6 +98,7 @@ class AppMessagingService : FirebaseMessagingService() {
     private fun resolveTitle(type: String): String? = when (type) {
         "daily_question" -> "Your daily question is waiting!"
         "partner_answered" -> "Your partner just answered!"
+        "partner_left" -> "Your partner has left"
         "streak" -> "Keep your streak going — answer today's question!"
         else -> null
     }
@@ -104,6 +106,7 @@ class AppMessagingService : FirebaseMessagingService() {
     private fun resolveBody(type: String): String? = when (type) {
         "daily_question" -> "Tap to answer today's question together."
         "partner_answered" -> "See what your partner shared."
+        "partner_left" -> "You are no longer paired. Tap to create a new invite."
         "streak" -> "Don't break the chain. Open the app now."
         else -> null
     }

app/src/main/java/app/closer/data/remote/FirestoreCoupleDataSource.kt

@@ -2,6 +2,7 @@ package app.closer.data.remote
 
 import app.closer.domain.model.Couple
 import com.google.firebase.firestore.DocumentSnapshot
+import com.google.firebase.firestore.FieldValue
 import com.google.firebase.firestore.FirebaseFirestore
 import com.google.firebase.firestore.SetOptions
 import kotlinx.coroutines.suspendCancellableCoroutine
@@ -99,6 +100,8 @@ class FirestoreCoupleDataSource @Inject constructor(private val db: FirebaseFire
         }
         @Suppress("UNCHECKED_CAST")
         val allUserIds = (coupleSnap.get("userIds") as? List<String>) ?: listOf(userId)
+        val partnerId = allUserIds.firstOrNull { it != userId }
+
         suspendCancellableCoroutine<Unit> { cont ->
             val batch = db.batch()
             allUserIds.forEach { uid ->
@@ -108,8 +111,32 @@ class FirestoreCoupleDataSource @Inject constructor(private val db: FirebaseFire
                 .addOnSuccessListener { cont.resume(Unit) }
                 .addOnFailureListener { cont.resumeWithException(it) }
         }
+
+        // After successfully clearing the couple state, queue an in-app notification
+        // for the partner so they see the unpair event even if FCM is delayed.
+        if (!partnerId.isNullOrBlank()) {
+            writePartnerLeftNotification(partnerId)
+        }
     }
 
+    private suspend fun writePartnerLeftNotification(partnerId: String): Unit =
+        suspendCancellableCoroutine { cont ->
+            db.collection(FirestoreCollections.USERS)
+                .document(partnerId)
+                .collection("notification_queue")
+                .add(
+                    mapOf(
+                        "type" to "partner_left",
+                        "title" to "Your partner has left",
+                        "body" to "You are no longer paired.",
+                        "read" to false,
+                        "createdAt" to FieldValue.serverTimestamp()
+                    )
+                )
+                .addOnSuccessListener { cont.resume(Unit) }
+                .addOnFailureListener { cont.resumeWithException(it) }
+        }
+
     @Suppress("UNCHECKED_CAST")
     private fun DocumentSnapshot.toCouple() = Couple(
         id = id,

app/src/main/java/app/closer/ui/home/HomeScreen.kt

@@ -42,6 +42,10 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.remember
 import app.closer.core.navigation.AppRoute
 import app.closer.domain.model.Question
 import app.closer.domain.model.QuestionCategory
@@ -54,9 +58,24 @@ fun HomeScreen(
     viewModel: HomeViewModel = hiltViewModel()
 ) {
     val state by viewModel.uiState.collectAsState()
+    val snackbarHostState = remember { SnackbarHostState() }
+
+    LaunchedEffect(state.partnerLeftEvent, state.partnerName) {
+        if (state.partnerLeftEvent) {
+            val partner = state.partnerName
+            val message = if (!partner.isNullOrBlank()) {
+                "You are no longer paired with $partner."
+            } else {
+                "You are no longer paired."
+            }
+            snackbarHostState.showSnackbar(message)
+            viewModel.consumePartnerLeftEvent()
+        }
+    }
 
     HomeContent(
         state = state,
+        snackbarHostState = snackbarHostState,
         onDailyQuestion = { onNavigate(AppRoute.DAILY_QUESTION) },
         onPacks = { onNavigate(AppRoute.QUESTION_PACKS) },
         onCategory = { categoryId -> onNavigate(AppRoute.questionCategory(categoryId)) },
@@ -70,6 +89,7 @@ fun HomeScreen(
 @Composable
 private fun HomeContent(
     state: HomeUiState,
+    snackbarHostState: SnackbarHostState,
     onDailyQuestion: () -> Unit,
     onPacks: () -> Unit,
     onCategory: (String) -> Unit,
@@ -85,6 +105,12 @@ private fun HomeContent(
                 closerBackgroundBrush()
             )
     ) {
+        SnackbarHost(
+            hostState = snackbarHostState,
+            modifier = Modifier
+                .align(Alignment.TopCenter)
+                .padding(top = 48.dp)
+        )
         Column(
             modifier = Modifier
                 .fillMaxSize()
@@ -706,6 +732,7 @@ fun HomeScreenPreview() {
                 )
             )
         ),
+        snackbarHostState = remember { SnackbarHostState() },
         onDailyQuestion = {},
         onPacks = {},
         onCategory = {},

app/src/main/java/app/closer/ui/home/HomeViewModel.kt

@@ -11,6 +11,7 @@ import app.closer.domain.repository.CoupleRepository
 import app.closer.domain.repository.LocalAnswerRepository
 import app.closer.domain.repository.QuestionRepository
 import app.closer.domain.repository.UserRepository
+import com.google.firebase.firestore.FirebaseFirestore
 import dagger.hilt.android.lifecycle.HiltViewModel
 import javax.inject.Inject
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -71,7 +72,8 @@ data class HomeUiState(
     val streakCount: Int = 0,
     val isPaired: Boolean = false,
     val primaryAction: HomeAction? = null,
-    val secondaryActions: List<HomeAction> = emptyList()
+    val secondaryActions: List<HomeAction> = emptyList(),
+    val partnerLeftEvent: Boolean = false
 )
 
 @HiltViewModel
@@ -80,15 +82,25 @@ class HomeViewModel @Inject constructor(
     private val localAnswerRepository: LocalAnswerRepository,
     private val authRepository: AuthRepository,
     private val coupleRepository: CoupleRepository,
-    private val userRepository: UserRepository
+    private val userRepository: UserRepository,
+    private val db: FirebaseFirestore
 ) : ViewModel() {
 
     private val _uiState = MutableStateFlow(HomeUiState())
     val uiState: StateFlow<HomeUiState> = _uiState.asStateFlow()
 
+    private var coupleStateListener: com.google.firebase.firestore.ListenerRegistration? = null
+
     init {
         loadHome()
         observeAnswers()
+        observeCoupleState()
+    }
+
+    override fun onCleared() {
+        super.onCleared()
+        coupleStateListener?.remove()
+        coupleStateListener = null
     }
 
     fun loadHome() {
@@ -118,7 +130,8 @@ class HomeViewModel @Inject constructor(
                         categories = categories,
                         partnerName = partnerName,
                         streakCount = couple?.streakCount ?: 0,
-                        isPaired = couple != null
+                        isPaired = couple != null,
+                        partnerLeftEvent = false
                     ).withHomeActions()
                 }
             } catch (e: Exception) {
@@ -132,6 +145,43 @@ class HomeViewModel @Inject constructor(
         }
     }
 
+    private fun observeCoupleState() {
+        val uid = authRepository.currentUserId ?: return
+        coupleStateListener?.remove()
+        coupleStateListener = db.collection("users").document(uid)
+            .addSnapshotListener(com.google.firebase.firestore.MetadataChanges.INCLUDE) { snapshot, error ->
+                if (error != null || snapshot == null || !snapshot.exists()) {
+                    return@addSnapshotListener
+                }
+                val newCoupleId = snapshot.getString("coupleId")
+                val oldIsPaired = _uiState.value.isPaired
+                val oldPartnerName = _uiState.value.partnerName
+                val newIsPaired = !newCoupleId.isNullOrBlank()
+
+                if (newIsPaired != oldIsPaired) {
+                    // Capture partner name before reload so the banner can reference it.
+                    val showPartnerLeftBanner = oldIsPaired && !newIsPaired
+                    if (showPartnerLeftBanner) {
+                        _uiState.update {
+                            it.copy(
+                                isPaired = false,
+                                partnerName = null,
+                                partnerLeftEvent = true
+                            ).withHomeActions()
+                        }
+                    }
+                    loadHome()
+                }
+            }
+    }
+
+    /**
+     * Consumes the partner-left banner event. Call from the UI after showing it.
+     */
+    fun consumePartnerLeftEvent() {
+        _uiState.update { it.copy(partnerLeftEvent = false) }
+    }
+
     private fun observeAnswers() {
         viewModelScope.launch {
             localAnswerRepository.observeAnswers().collect { answers ->

functions/dist/couples/onCoupleLeave.js

@@ -0,0 +1,141 @@
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || (function () {
+    var ownKeys = function(o) {
+        ownKeys = Object.getOwnPropertyNames || function (o) {
+            var ar = [];
+            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
+            return ar;
+        };
+        return ownKeys(o);
+    };
+    return function (mod) {
+        if (mod && mod.__esModule) return mod;
+        var result = {};
+        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
+        __setModuleDefault(result, mod);
+        return result;
+    };
+})();
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.onCoupleLeave = void 0;
+const functions = __importStar(require("firebase-functions"));
+const admin = __importStar(require("firebase-admin"));
+/**
+ * Firestore trigger that notifies the remaining partner when a user's coupleId
+ * field is cleared (i.e. the user left the couple or was removed).
+ *
+ * Path: users/{userId}
+ * Condition: previous coupleId was non-empty and new coupleId is null/missing.
+ */
+exports.onCoupleLeave = functions.firestore
+    .document('users/{userId}')
+    .onUpdate(async (change, context) => {
+    var _a, _b, _c, _d, _e, _f;
+    const { userId } = context.params;
+    const previousData = (_a = change.before.data()) !== null && _a !== void 0 ? _a : {};
+    const currentData = (_b = change.after.data()) !== null && _b !== void 0 ? _b : {};
+    const previousCoupleId = previousData.coupleId;
+    const currentCoupleId = currentData.coupleId;
+    // Only act when coupleId transitions from a real value to null/empty.
+    if (!previousCoupleId || typeof previousCoupleId !== 'string') {
+        return;
+    }
+    if (currentCoupleId) {
+        return;
+    }
+    const db = admin.firestore();
+    const messaging = admin.messaging();
+    const coupleDoc = await db.collection('couples').doc(previousCoupleId).get();
+    if (!coupleDoc.exists) {
+        console.warn(`[onCoupleLeave] couple ${previousCoupleId} not found`);
+        return;
+    }
+    const userIds = ((_d = (_c = coupleDoc.data()) === null || _c === void 0 ? void 0 : _c.userIds) !== null && _d !== void 0 ? _d : []);
+    const partnerId = userIds.find((uid) => uid !== userId);
+    if (!partnerId) {
+        console.warn(`[onCoupleLeave] no partner found for couple ${previousCoupleId}`);
+        return;
+    }
+    // Make sure the partner is still paired in this couple.
+    // If both users are leaving simultaneously, avoid duplicate/phantom notifications.
+    const partnerUserDoc = await db.collection('users').doc(partnerId).get();
+    const partnerCoupleId = (_e = partnerUserDoc.data()) === null || _e === void 0 ? void 0 : _e.coupleId;
+    if (partnerCoupleId !== previousCoupleId) {
+        console.log(`[onCoupleLeave] partner ${partnerId} is no longer in couple ${previousCoupleId}; skipping notification`);
+        return;
+    }
+    const notificationPayload = {
+        type: 'partner_left',
+        title: 'Your partner has left',
+        body: 'You are no longer paired. Tap to create a new invite.',
+    };
+    // Write an in-app notification record for the partner.
+    // This is read-only denied for clients; the Cloud Function writes it.
+    await db
+        .collection('users')
+        .doc(partnerId)
+        .collection('notification_queue')
+        .add(Object.assign(Object.assign({}, notificationPayload), { read: false, createdAt: admin.firestore.FieldValue.serverTimestamp() }));
+    // Collect the partner's FCM tokens (legacy field + fcmTokens subcollection).
+    const tokens = [];
+    if (partnerUserDoc.exists) {
+        const legacyToken = (_f = partnerUserDoc.data()) === null || _f === void 0 ? void 0 : _f.fcmToken;
+        if (typeof legacyToken === 'string' && legacyToken.length > 0) {
+            tokens.push(legacyToken);
+        }
+    }
+    const tokenSnapshot = await db
+        .collection('users')
+        .doc(partnerId)
+        .collection('fcmTokens')
+        .get();
+    tokenSnapshot.docs.forEach((doc) => {
+        var _a;
+        const t = (_a = doc.data()) === null || _a === void 0 ? void 0 : _a.token;
+        if (typeof t === 'string' && t.length > 0 && !tokens.includes(t)) {
+            tokens.push(t);
+        }
+    });
+    if (tokens.length === 0) {
+        console.log(`[onCoupleLeave] no FCM tokens for partner ${partnerId}`);
+        return;
+    }
+    const fcmMessage = {
+        token: tokens[0],
+        notification: {
+            title: notificationPayload.title,
+            body: notificationPayload.body,
+        },
+        data: {
+            type: notificationPayload.type,
+        },
+    };
+    const sendResults = await Promise.allSettled(tokens.map((token) => messaging.send(Object.assign(Object.assign({}, fcmMessage), { token }))));
+    const failures = [];
+    sendResults.forEach((result, index) => {
+        if (result.status === 'rejected') {
+            failures.push(`${tokens[index]}: ${String(result.reason)}`);
+        }
+    });
+    if (failures.length > 0) {
+        console.error(`[onCoupleLeave] some notifications failed:`, failures);
+    }
+    console.log(`[onCoupleLeave] notified partner ${partnerId} that user ${userId} left couple ${previousCoupleId}`);
+});
+//# sourceMappingURL=onCoupleLeave.js.map

functions/dist/couples/onCoupleLeave.js.map

@@ -0,0 +1 @@
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functions/dist/index.js

@@ -33,7 +33,7 @@ var __importStar = (this && this.__importStar) || (function () {
     };
 })();
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.health = exports.onAnswerWritten = exports.assignDailyQuestionCallable = exports.assignDailyQuestion = exports.createDateMatchOnMutualLove = exports.checkDeviceIntegrity = exports.sendPartnerAnsweredNotification = exports.sendDailyQuestionReminder = exports.syncEntitlement = exports.revenueCatWebhook = void 0;
+exports.health = exports.onCoupleLeave = exports.onAnswerWritten = exports.assignDailyQuestionCallable = exports.assignDailyQuestion = exports.createDateMatchOnMutualLove = exports.checkDeviceIntegrity = exports.sendPartnerAnsweredNotification = exports.sendDailyQuestionReminder = exports.syncEntitlement = exports.revenueCatWebhook = void 0;
 const functions = __importStar(require("firebase-functions"));
 const admin = __importStar(require("firebase-admin"));
 // Initialize the Admin SDK once for every function in this codebase.
@@ -58,6 +58,8 @@ Object.defineProperty(exports, "assignDailyQuestion", { enumerable: true, get: f
 Object.defineProperty(exports, "assignDailyQuestionCallable", { enumerable: true, get: function () { return assignDailyQuestion_1.assignDailyQuestionCallable; } });
 var onAnswerWritten_1 = require("./questions/onAnswerWritten");
 Object.defineProperty(exports, "onAnswerWritten", { enumerable: true, get: function () { return onAnswerWritten_1.onAnswerWritten; } });
+var onCoupleLeave_1 = require("./couples/onCoupleLeave");
+Object.defineProperty(exports, "onCoupleLeave", { enumerable: true, get: function () { return onCoupleLeave_1.onCoupleLeave; } });
 /**
  * Basic health check callable.
  * Useful for verifying function deployment and firebase-tools wiring.

functions/dist/index.js.map

@@ -1 +1 @@
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+{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAAA,8DAA+C;AAC/C,sDAAuC;AAEvC,qEAAqE;AACrE,8EAA8E;AAC9E,gFAAgF;AAChF,IAAI,KAAK,CAAC,IAAI,CAAC,MAAM,KAAK,CAAC,EAAE,CAAC;IAC5B,KAAK,CAAC,aAAa,EAAE,CAAA;AACvB,CAAC;AAED,iEAA+D;AAAtD,sHAAA,iBAAiB,OAAA;AAC1B,6DAA2D;AAAlD,kHAAA,eAAe,OAAA;AACxB,uDAGkC;AAFhC,sHAAA,yBAAyB,OAAA;AACzB,4HAAA,+BAA+B,OAAA;AAEjC,wEAAsE;AAA7D,4HAAA,oBAAoB,OAAA;AAC7B,2DAAqE;AAA5D,8HAAA,2BAA2B,OAAA;AACpC,uEAGwC;AAFtC,0HAAA,mBAAmB,OAAA;AACnB,kIAAA,2BAA2B,OAAA;AAE7B,+DAA6D;AAApD,kHAAA,eAAe,OAAA;AACxB,yDAAuD;AAA9C,8GAAA,aAAa,OAAA;AAEtB;;;GAGG;AACU,QAAA,MAAM,GAAG,SAAS,CAAC,KAAK,CAAC,SAAS,CAAC,CAAC,GAAG,EAAE,GAAG,EAAE,EAAE;IAC3D,GAAG,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC,IAAI,CAAC,EAAE,MAAM,EAAE,IAAI,EAAE,CAAC,CAAA;AACxC,CAAC,CAAC,CAAA"}

functions/src/couples/onCoupleLeave.ts

@@ -0,0 +1,130 @@
+import * as functions from 'firebase-functions'
+import * as admin from 'firebase-admin'
+
+/**
+ * Firestore trigger that notifies the remaining partner when a user's coupleId
+ * field is cleared (i.e. the user left the couple or was removed).
+ *
+ * Path: users/{userId}
+ * Condition: previous coupleId was non-empty and new coupleId is null/missing.
+ */
+export const onCoupleLeave = functions.firestore
+  .document('users/{userId}')
+  .onUpdate(async (change, context) => {
+    const { userId } = context.params as { userId: string }
+
+    const previousData = change.before.data() ?? {}
+    const currentData = change.after.data() ?? {}
+
+    const previousCoupleId = previousData.coupleId
+    const currentCoupleId = currentData.coupleId
+
+    // Only act when coupleId transitions from a real value to null/empty.
+    if (!previousCoupleId || typeof previousCoupleId !== 'string') {
+      return
+    }
+    if (currentCoupleId) {
+      return
+    }
+
+    const db = admin.firestore()
+    const messaging = admin.messaging()
+
+    const coupleDoc = await db.collection('couples').doc(previousCoupleId).get()
+    if (!coupleDoc.exists) {
+      console.warn(`[onCoupleLeave] couple ${previousCoupleId} not found`)
+      return
+    }
+
+    const userIds = (coupleDoc.data()?.userIds ?? []) as string[]
+    const partnerId = userIds.find((uid) => uid !== userId)
+    if (!partnerId) {
+      console.warn(`[onCoupleLeave] no partner found for couple ${previousCoupleId}`)
+      return
+    }
+
+    // Make sure the partner is still paired in this couple.
+    // If both users are leaving simultaneously, avoid duplicate/phantom notifications.
+    const partnerUserDoc = await db.collection('users').doc(partnerId).get()
+    const partnerCoupleId = partnerUserDoc.data()?.coupleId
+    if (partnerCoupleId !== previousCoupleId) {
+      console.log(
+        `[onCoupleLeave] partner ${partnerId} is no longer in couple ${previousCoupleId}; skipping notification`
+      )
+      return
+    }
+
+    const notificationPayload = {
+      type: 'partner_left',
+      title: 'Your partner has left',
+      body: 'You are no longer paired. Tap to create a new invite.',
+    }
+
+    // Write an in-app notification record for the partner.
+    // This is read-only denied for clients; the Cloud Function writes it.
+    await db
+      .collection('users')
+      .doc(partnerId)
+      .collection('notification_queue')
+      .add({
+        ...notificationPayload,
+        read: false,
+        createdAt: admin.firestore.FieldValue.serverTimestamp(),
+      })
+
+    // Collect the partner's FCM tokens (legacy field + fcmTokens subcollection).
+    const tokens: string[] = []
+    if (partnerUserDoc.exists) {
+      const legacyToken = partnerUserDoc.data()?.fcmToken
+      if (typeof legacyToken === 'string' && legacyToken.length > 0) {
+        tokens.push(legacyToken)
+      }
+    }
+
+    const tokenSnapshot = await db
+      .collection('users')
+      .doc(partnerId)
+      .collection('fcmTokens')
+      .get()
+    tokenSnapshot.docs.forEach((doc) => {
+      const t = doc.data()?.token
+      if (typeof t === 'string' && t.length > 0 && !tokens.includes(t)) {
+        tokens.push(t)
+      }
+    })
+
+    if (tokens.length === 0) {
+      console.log(`[onCoupleLeave] no FCM tokens for partner ${partnerId}`)
+      return
+    }
+
+    const fcmMessage: admin.messaging.Message = {
+      token: tokens[0],
+      notification: {
+        title: notificationPayload.title,
+        body: notificationPayload.body,
+      },
+      data: {
+        type: notificationPayload.type,
+      },
+    }
+
+    const sendResults = await Promise.allSettled(
+      tokens.map((token) => messaging.send({ ...fcmMessage, token }))
+    )
+
+    const failures: string[] = []
+    sendResults.forEach((result, index) => {
+      if (result.status === 'rejected') {
+        failures.push(`${tokens[index]}: ${String(result.reason)}`)
+      }
+    })
+
+    if (failures.length > 0) {
+      console.error(`[onCoupleLeave] some notifications failed:`, failures)
+    }
+
+    console.log(
+      `[onCoupleLeave] notified partner ${partnerId} that user ${userId} left couple ${previousCoupleId}`
+    )
+  })

functions/src/index.ts

@@ -21,6 +21,7 @@ export {
   assignDailyQuestionCallable,
 } from './questions/assignDailyQuestion'
 export { onAnswerWritten } from './questions/onAnswerWritten'
+export { onCoupleLeave } from './couples/onCoupleLeave'
 
 /**
  * Basic health check callable.