add room db

AGENTS.md

@@ -576,6 +576,14 @@ GET /properties/{propertyId}/bookings/{bookingId}/balance
 - Imports/packages follow the structure above.
 - Build passes: `./gradlew :app:compileDebugKotlin`.
 
+### Room DB synchronization rule (mandatory)
+
+- For any editable API-backed field, follow this write path only: `UI action -> server request -> Room DB update -> UI reacts from Room observers`.
+- Server is source of truth; do not bypass server by writing final business state directly from UI.
+- UI must render from Room-backed state, not from one-off API responses or direct text mutation.
+- Avoid forced full refresh after each mutation unless strictly required by backend limitations; prefer targeted Room updates for linked entities.
+- On mutation failure, keep prior DB state unchanged and surface error state to UI.
+
 ### Guest Documents Authorization (mandatory)
 
 - View access: `ADMIN`, `MANAGER` (and super admin).

app/build.gradle.kts

@@ -1,14 +1,17 @@
+import com.android.build.api.dsl.ApplicationExtension
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
     alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.ksp)
     id("com.google.gms.google-services")
 }
 
-android {
+extensions.configure<ApplicationExtension>("android") {
     namespace = "com.android.trisolarispms"
-    compileSdk {
+    compileSdk = 36
-        version = release(36)
-    }
 
     defaultConfig {
         applicationId = "com.android.trisolarispms"
@@ -29,16 +32,24 @@ android {
             )
         }
     }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
     }
+
     buildFeatures {
         compose = true
         buildConfig = true
     }
 }
 
+kotlin {
+    compilerOptions {
+        jvmTarget.set(JvmTarget.JVM_11)
+    }
+}
+
 dependencies {
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
@@ -63,6 +74,9 @@ dependencies {
     implementation(libs.calendar.compose)
     implementation(libs.libphonenumber)
     implementation(libs.zxing.core)
+    implementation(libs.androidx.room.runtime)
+    implementation(libs.androidx.room.ktx)
+    ksp(libs.androidx.room.compiler)
     implementation(platform(libs.firebase.bom))
     implementation(libs.firebase.auth.ktx)
     implementation(libs.kotlinx.coroutines.play.services)

app/src/main/java/com/android/trisolarispms/data/local/booking/BookingDetailsCacheDao.kt

@@ -0,0 +1,30 @@
+package com.android.trisolarispms.data.local.booking
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface BookingDetailsCacheDao {
+    @Query(
+        """
+        SELECT * FROM booking_details_cache
+        WHERE propertyId = :propertyId AND bookingId = :bookingId
+        LIMIT 1
+        """
+    )
+    fun observe(propertyId: String, bookingId: String): Flow<BookingDetailsCacheEntity?>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun upsert(entity: BookingDetailsCacheEntity)
+
+    @Query(
+        """
+        DELETE FROM booking_details_cache
+        WHERE propertyId = :propertyId AND bookingId = :bookingId
+        """
+    )
+    suspend fun delete(propertyId: String, bookingId: String)
+}

app/src/main/java/com/android/trisolarispms/data/local/booking/BookingDetailsCacheEntity.kt

@@ -0,0 +1,136 @@
+package com.android.trisolarispms.data.local.booking
+
+import androidx.room.Entity
+import com.android.trisolarispms.data.api.model.BookingDetailsResponse
+
+@Entity(
+    tableName = "booking_details_cache",
+    primaryKeys = ["propertyId", "bookingId"]
+)
+data class BookingDetailsCacheEntity(
+    val propertyId: String,
+    val bookingId: String,
+    val detailsId: String? = null,
+    val status: String? = null,
+    val guestId: String? = null,
+    val guestName: String? = null,
+    val guestPhone: String? = null,
+    val guestNationality: String? = null,
+    val guestAge: String? = null,
+    val guestAddressText: String? = null,
+    val guestSignatureUrl: String? = null,
+    val vehicleNumbers: List<String> = emptyList(),
+    val roomNumbers: List<Int> = emptyList(),
+    val source: String? = null,
+    val fromCity: String? = null,
+    val toCity: String? = null,
+    val memberRelation: String? = null,
+    val transportMode: String? = null,
+    val expectedCheckInAt: String? = null,
+    val expectedCheckOutAt: String? = null,
+    val checkInAt: String? = null,
+    val checkOutAt: String? = null,
+    val adultCount: Int? = null,
+    val maleCount: Int? = null,
+    val femaleCount: Int? = null,
+    val childCount: Int? = null,
+    val totalGuestCount: Int? = null,
+    val expectedGuestCount: Int? = null,
+    val totalNightlyRate: Long? = null,
+    val notes: String? = null,
+    val registeredByName: String? = null,
+    val registeredByPhone: String? = null,
+    val expectedPay: Long? = null,
+    val amountCollected: Long? = null,
+    val pending: Long? = null,
+    val billableNights: Long? = null,
+    val billingMode: String? = null,
+    val billingCheckinTime: String? = null,
+    val billingCheckoutTime: String? = null,
+    val updatedAtEpochMs: Long = System.currentTimeMillis()
+)
+
+internal fun BookingDetailsResponse.toCacheEntity(
+    propertyId: String,
+    bookingId: String
+): BookingDetailsCacheEntity = BookingDetailsCacheEntity(
+    propertyId = propertyId,
+    bookingId = bookingId,
+    detailsId = id,
+    status = status,
+    guestId = guestId,
+    guestName = guestName,
+    guestPhone = guestPhone,
+    guestNationality = guestNationality,
+    guestAge = guestAge,
+    guestAddressText = guestAddressText,
+    guestSignatureUrl = guestSignatureUrl,
+    vehicleNumbers = vehicleNumbers,
+    roomNumbers = roomNumbers,
+    source = source,
+    fromCity = fromCity,
+    toCity = toCity,
+    memberRelation = memberRelation,
+    transportMode = transportMode,
+    expectedCheckInAt = expectedCheckInAt,
+    expectedCheckOutAt = expectedCheckOutAt,
+    checkInAt = checkInAt,
+    checkOutAt = checkOutAt,
+    adultCount = adultCount,
+    maleCount = maleCount,
+    femaleCount = femaleCount,
+    childCount = childCount,
+    totalGuestCount = totalGuestCount,
+    expectedGuestCount = expectedGuestCount,
+    totalNightlyRate = totalNightlyRate,
+    notes = notes,
+    registeredByName = registeredByName,
+    registeredByPhone = registeredByPhone,
+    expectedPay = expectedPay,
+    amountCollected = amountCollected,
+    pending = pending,
+    billableNights = billableNights,
+    billingMode = billingMode,
+    billingCheckinTime = billingCheckinTime,
+    billingCheckoutTime = billingCheckoutTime
+)
+
+internal fun BookingDetailsCacheEntity.toApiModel(): BookingDetailsResponse = BookingDetailsResponse(
+    id = detailsId ?: bookingId,
+    status = status,
+    guestId = guestId,
+    guestName = guestName,
+    guestPhone = guestPhone,
+    guestNationality = guestNationality,
+    guestAge = guestAge,
+    guestAddressText = guestAddressText,
+    guestSignatureUrl = guestSignatureUrl,
+    vehicleNumbers = vehicleNumbers,
+    roomNumbers = roomNumbers,
+    source = source,
+    fromCity = fromCity,
+    toCity = toCity,
+    memberRelation = memberRelation,
+    transportMode = transportMode,
+    expectedCheckInAt = expectedCheckInAt,
+    expectedCheckOutAt = expectedCheckOutAt,
+    checkInAt = checkInAt,
+    checkOutAt = checkOutAt,
+    adultCount = adultCount,
+    maleCount = maleCount,
+    femaleCount = femaleCount,
+    childCount = childCount,
+    totalGuestCount = totalGuestCount,
+    expectedGuestCount = expectedGuestCount,
+    totalNightlyRate = totalNightlyRate,
+    notes = notes,
+    registeredByName = registeredByName,
+    registeredByPhone = registeredByPhone,
+    expectedPay = expectedPay,
+    amountCollected = amountCollected,
+    pending = pending,
+    billableNights = billableNights,
+    billingMode = billingMode,
+    billingCheckinTime = billingCheckinTime,
+    billingCheckoutTime = billingCheckoutTime
+)

app/src/main/java/com/android/trisolarispms/data/local/booking/BookingDetailsRepository.kt

@@ -0,0 +1,58 @@
+package com.android.trisolarispms.data.local.booking
+
+import com.android.trisolarispms.data.api.core.ApiClient
+import com.android.trisolarispms.data.api.core.ApiService
+import com.android.trisolarispms.data.api.model.BookingDetailsResponse
+import com.android.trisolarispms.data.api.model.BookingExpectedDatesRequest
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+
+class BookingDetailsRepository(
+    private val dao: BookingDetailsCacheDao,
+    private val createApi: () -> ApiService = { ApiClient.create() }
+) {
+    fun observeBookingDetails(
+        propertyId: String,
+        bookingId: String
+    ): Flow<BookingDetailsResponse?> =
+        dao.observe(propertyId = propertyId, bookingId = bookingId).map { cached ->
+            cached?.toApiModel()
+        }
+
+    suspend fun refreshBookingDetails(
+        propertyId: String,
+        bookingId: String
+    ): Result<Unit> = runCatching {
+        val response = createApi().getBookingDetails(propertyId = propertyId, bookingId = bookingId)
+        if (!response.isSuccessful) {
+            throw IllegalStateException("Load failed: ${response.code()}")
+        }
+        val body = response.body() ?: throw IllegalStateException("Load failed: empty response")
+        dao.upsert(body.toCacheEntity(propertyId = propertyId, bookingId = bookingId))
+    }
+
+    suspend fun updateExpectedDates(
+        propertyId: String,
+        bookingId: String,
+        body: BookingExpectedDatesRequest
+    ): Result<Unit> = runCatching {
+        val api = createApi()
+        val response = api.updateExpectedDates(
+            propertyId = propertyId,
+            bookingId = bookingId,
+            body = body
+        )
+        if (!response.isSuccessful) {
+            throw IllegalStateException("Update failed: ${response.code()}")
+        }
+        refreshBookingDetails(propertyId = propertyId, bookingId = bookingId).getOrThrow()
+    }
+
+    suspend fun storeSnapshot(
+        propertyId: String,
+        bookingId: String,
+        details: BookingDetailsResponse
+    ) {
+        dao.upsert(details.toCacheEntity(propertyId = propertyId, bookingId = bookingId))
+    }
+}

app/src/main/java/com/android/trisolarispms/data/local/core/AppDatabase.kt

@@ -0,0 +1,67 @@
+package com.android.trisolarispms.data.local.core
+
+import androidx.room.Database
+import androidx.room.RoomDatabase
+import androidx.room.TypeConverters
+import androidx.sqlite.db.SupportSQLiteDatabase
+import com.android.trisolarispms.data.local.booking.BookingDetailsCacheDao
+import com.android.trisolarispms.data.local.booking.BookingDetailsCacheEntity
+import com.android.trisolarispms.data.local.roomstay.ActiveRoomStayCacheDao
+import com.android.trisolarispms.data.local.roomstay.ActiveRoomStayCacheEntity
+import androidx.room.migration.Migration
+
+@Database(
+    entities = [
+        BookingDetailsCacheEntity::class,
+        ActiveRoomStayCacheEntity::class
+    ],
+    version = 2,
+    exportSchema = false
+)
+@TypeConverters(RoomConverters::class)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun bookingDetailsCacheDao(): BookingDetailsCacheDao
+    abstract fun activeRoomStayCacheDao(): ActiveRoomStayCacheDao
+
+    companion object {
+        val MIGRATION_1_2 = object : Migration(1, 2) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL(
+                    """
+                    CREATE TABLE IF NOT EXISTS `active_room_stay_cache` (
+                        `roomStayId` TEXT NOT NULL,
+                        `propertyId` TEXT NOT NULL,
+                        `bookingId` TEXT,
+                        `guestId` TEXT,
+                        `guestName` TEXT,
+                        `guestPhone` TEXT,
+                        `roomId` TEXT,
+                        `roomNumber` INTEGER,
+                        `roomTypeCode` TEXT,
+                        `roomTypeName` TEXT,
+                        `fromAt` TEXT,
+                        `checkinAt` TEXT,
+                        `expectedCheckoutAt` TEXT,
+                        `nightlyRate` INTEGER,
+                        `currency` TEXT,
+                        `updatedAtEpochMs` INTEGER NOT NULL,
+                        PRIMARY KEY(`roomStayId`)
+                    )
+                    """.trimIndent()
+                )
+                db.execSQL(
+                    """
+                    CREATE INDEX IF NOT EXISTS `index_active_room_stay_cache_propertyId`
+                    ON `active_room_stay_cache` (`propertyId`)
+                    """.trimIndent()
+                )
+                db.execSQL(
+                    """
+                    CREATE INDEX IF NOT EXISTS `index_active_room_stay_cache_propertyId_bookingId`
+                    ON `active_room_stay_cache` (`propertyId`, `bookingId`)
+                    """.trimIndent()
+                )
+            }
+        }
+    }
+}

app/src/main/java/com/android/trisolarispms/data/local/core/LocalDatabaseProvider.kt

@@ -0,0 +1,24 @@
+package com.android.trisolarispms.data.local.core
+
+import android.content.Context
+import androidx.room.Room
+
+object LocalDatabaseProvider {
+    @Volatile
+    private var instance: AppDatabase? = null
+
+    fun get(context: Context): AppDatabase {
+        return instance ?: synchronized(this) {
+            instance ?: Room.databaseBuilder(
+                context.applicationContext,
+                AppDatabase::class.java,
+                "trisolaris_pms_local.db"
+            )
+                .addMigrations(AppDatabase.MIGRATION_1_2)
+                .build()
+                .also { built ->
+                instance = built
+            }
+        }
+    }
+}

app/src/main/java/com/android/trisolarispms/data/local/core/RoomConverters.kt

@@ -0,0 +1,29 @@
+package com.android.trisolarispms.data.local.core
+
+import androidx.room.TypeConverter
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+
+class RoomConverters {
+    private val gson = Gson()
+    private val stringListType = object : TypeToken<List<String>>() {}.type
+    private val intListType = object : TypeToken<List<Int>>() {}.type
+
+    @TypeConverter
+    fun fromStringList(value: List<String>?): String = gson.toJson(value.orEmpty())
+
+    @TypeConverter
+    fun toStringList(value: String?): List<String> {
+        if (value.isNullOrBlank()) return emptyList()
+        return runCatching { gson.fromJson<List<String>>(value, stringListType) }.getOrDefault(emptyList())
+    }
+
+    @TypeConverter
+    fun fromIntList(value: List<Int>?): String = gson.toJson(value.orEmpty())
+
+    @TypeConverter
+    fun toIntList(value: String?): List<Int> {
+        if (value.isNullOrBlank()) return emptyList()
+        return runCatching { gson.fromJson<List<Int>>(value, intListType) }.getOrDefault(emptyList())
+    }
+}

app/src/main/java/com/android/trisolarispms/data/local/roomstay/ActiveRoomStayCacheDao.kt

@@ -0,0 +1,61 @@
+package com.android.trisolarispms.data.local.roomstay
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Transaction
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface ActiveRoomStayCacheDao {
+    @Query(
+        """
+        SELECT * FROM active_room_stay_cache
+        WHERE propertyId = :propertyId
+        ORDER BY roomNumber ASC, roomStayId ASC
+        """
+    )
+    fun observeByProperty(propertyId: String): Flow<List<ActiveRoomStayCacheEntity>>
+
+    @Query(
+        """
+        SELECT * FROM active_room_stay_cache
+        WHERE propertyId = :propertyId AND bookingId = :bookingId
+        ORDER BY roomNumber ASC, roomStayId ASC
+        """
+    )
+    fun observeByBooking(propertyId: String, bookingId: String): Flow<List<ActiveRoomStayCacheEntity>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun upsertAll(items: List<ActiveRoomStayCacheEntity>)
+
+    @Query("DELETE FROM active_room_stay_cache WHERE propertyId = :propertyId")
+    suspend fun deleteByProperty(propertyId: String)
+
+    @Query("DELETE FROM active_room_stay_cache WHERE propertyId = :propertyId AND roomStayId = :roomStayId")
+    suspend fun deleteByRoomStay(propertyId: String, roomStayId: String)
+
+    @Query(
+        """
+        UPDATE active_room_stay_cache
+        SET expectedCheckoutAt = :expectedCheckoutAt,
+            updatedAtEpochMs = :updatedAtEpochMs
+        WHERE propertyId = :propertyId AND bookingId = :bookingId
+        """
+    )
+    suspend fun updateExpectedCheckoutAtForBooking(
+        propertyId: String,
+        bookingId: String,
+        expectedCheckoutAt: String?,
+        updatedAtEpochMs: Long
+    )
+
+    @Transaction
+    suspend fun replaceForProperty(propertyId: String, items: List<ActiveRoomStayCacheEntity>) {
+        deleteByProperty(propertyId)
+        if (items.isNotEmpty()) {
+            upsertAll(items)
+        }
+    }
+}

app/src/main/java/com/android/trisolarispms/data/local/roomstay/ActiveRoomStayCacheEntity.kt

@@ -0,0 +1,71 @@
+package com.android.trisolarispms.data.local.roomstay
+
+import androidx.room.Entity
+import androidx.room.Index
+import androidx.room.PrimaryKey
+import com.android.trisolarispms.data.api.model.ActiveRoomStayDto
+
+@Entity(
+    tableName = "active_room_stay_cache",
+    indices = [
+        Index(value = ["propertyId"]),
+        Index(value = ["propertyId", "bookingId"])
+    ]
+)
+data class ActiveRoomStayCacheEntity(
+    @PrimaryKey
+    val roomStayId: String,
+    val propertyId: String,
+    val bookingId: String? = null,
+    val guestId: String? = null,
+    val guestName: String? = null,
+    val guestPhone: String? = null,
+    val roomId: String? = null,
+    val roomNumber: Int? = null,
+    val roomTypeCode: String? = null,
+    val roomTypeName: String? = null,
+    val fromAt: String? = null,
+    val checkinAt: String? = null,
+    val expectedCheckoutAt: String? = null,
+    val nightlyRate: Long? = null,
+    val currency: String? = null,
+    val updatedAtEpochMs: Long = System.currentTimeMillis()
+)
+
+internal fun ActiveRoomStayDto.toCacheEntity(propertyId: String): ActiveRoomStayCacheEntity? {
+    val stayId = roomStayId?.trim()?.ifBlank { null } ?: return null
+    return ActiveRoomStayCacheEntity(
+        roomStayId = stayId,
+        propertyId = propertyId,
+        bookingId = bookingId,
+        guestId = guestId,
+        guestName = guestName,
+        guestPhone = guestPhone,
+        roomId = roomId,
+        roomNumber = roomNumber,
+        roomTypeCode = roomTypeCode,
+        roomTypeName = roomTypeName,
+        fromAt = fromAt,
+        checkinAt = checkinAt,
+        expectedCheckoutAt = expectedCheckoutAt,
+        nightlyRate = nightlyRate,
+        currency = currency
+    )
+}
+
+internal fun ActiveRoomStayCacheEntity.toApiModel(): ActiveRoomStayDto = ActiveRoomStayDto(
+    roomStayId = roomStayId,
+    bookingId = bookingId,
+    guestId = guestId,
+    guestName = guestName,
+    guestPhone = guestPhone,
+    roomId = roomId,
+    roomNumber = roomNumber,
+    roomTypeCode = roomTypeCode,
+    roomTypeName = roomTypeName,
+    fromAt = fromAt,
+    checkinAt = checkinAt,
+    expectedCheckoutAt = expectedCheckoutAt,
+    nightlyRate = nightlyRate,
+    currency = currency
+)

app/src/main/java/com/android/trisolarispms/data/local/roomstay/ActiveRoomStayRepository.kt

@@ -0,0 +1,48 @@
+package com.android.trisolarispms.data.local.roomstay
+
+import com.android.trisolarispms.data.api.core.ApiClient
+import com.android.trisolarispms.data.api.core.ApiService
+import com.android.trisolarispms.data.api.model.ActiveRoomStayDto
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+
+class ActiveRoomStayRepository(
+    private val dao: ActiveRoomStayCacheDao,
+    private val createApi: () -> ApiService = { ApiClient.create() }
+) {
+    fun observeByProperty(propertyId: String): Flow<List<ActiveRoomStayDto>> =
+        dao.observeByProperty(propertyId = propertyId).map { rows ->
+            rows.map { it.toApiModel() }
+        }
+
+    fun observeByBooking(propertyId: String, bookingId: String): Flow<List<ActiveRoomStayDto>> =
+        dao.observeByBooking(propertyId = propertyId, bookingId = bookingId).map { rows ->
+            rows.map { it.toApiModel() }
+        }
+
+    suspend fun refresh(propertyId: String): Result<Unit> = runCatching {
+        val response = createApi().listActiveRoomStays(propertyId = propertyId)
+        if (!response.isSuccessful) {
+            throw IllegalStateException("Load failed: ${response.code()}")
+        }
+        val rows = response.body().orEmpty().mapNotNull { it.toCacheEntity(propertyId = propertyId) }
+        dao.replaceForProperty(propertyId = propertyId, items = rows)
+    }
+
+    suspend fun removeFromCache(propertyId: String, roomStayId: String) {
+        dao.deleteByRoomStay(propertyId = propertyId, roomStayId = roomStayId)
+    }
+
+    suspend fun patchExpectedCheckoutForBooking(
+        propertyId: String,
+        bookingId: String,
+        expectedCheckoutAt: String?
+    ) {
+        dao.updateExpectedCheckoutAtForBooking(
+            propertyId = propertyId,
+            bookingId = bookingId,
+            expectedCheckoutAt = expectedCheckoutAt,
+            updatedAtEpochMs = System.currentTimeMillis()
+        )
+    }
+}

app/src/main/java/com/android/trisolarispms/ui/roomstay/ActiveRoomStaysViewModel.kt

@@ -1,15 +1,28 @@
 package com.android.trisolarispms.ui.roomstay
 
-import androidx.lifecycle.ViewModel
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
 import com.android.trisolarispms.data.api.core.ApiClient
-import com.android.trisolarispms.core.viewmodel.launchRequest
+import com.android.trisolarispms.data.local.core.LocalDatabaseProvider
+import com.android.trisolarispms.data.local.roomstay.ActiveRoomStayRepository
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
 
-class ActiveRoomStaysViewModel : ViewModel() {
+class ActiveRoomStaysViewModel(
+    application: Application
+) : AndroidViewModel(application) {
     private val _state = MutableStateFlow(ActiveRoomStaysState())
     val state: StateFlow<ActiveRoomStaysState> = _state
+    private val repository = ActiveRoomStayRepository(
+        dao = LocalDatabaseProvider.get(application).activeRoomStayCacheDao()
+    )
+    private var observeJob: Job? = null
+    private var observePropertyId: String? = null
 
     fun toggleShowOpenBookings() {
         _state.update { it.copy(showOpenBookings = !it.showOpenBookings) }
@@ -21,28 +34,65 @@ class ActiveRoomStaysViewModel : ViewModel() {
 
     fun load(propertyId: String) {
         if (propertyId.isBlank()) return
-        launchRequest(
+        observeCache(propertyId = propertyId)
-            state = _state,
+        _state.update { it.copy(isLoading = true, error = null) }
-            setLoading = { it.copy(isLoading = true, error = null) },
+        viewModelScope.launch {
-            setError = { current, message -> current.copy(isLoading = false, error = message) },
+            val activeResult = repository.refresh(propertyId = propertyId)
-            defaultError = "Load failed"
-        ) {
             val api = ApiClient.create()
-            val activeResponse = api.listActiveRoomStays(propertyId)
+            val checkedInBookingsResponse = runCatching {
-            val bookingsResponse = api.listBookings(propertyId, status = "CHECKED_IN")
+                api.listBookings(propertyId = propertyId, status = "CHECKED_IN")
-            val openBookingsResponse = api.listBookings(propertyId, status = "OPEN")
+            }.getOrNull()
-            if (activeResponse.isSuccessful) {
+            val openBookingsResponse = runCatching {
-                _state.update {
+                api.listBookings(propertyId = propertyId, status = "OPEN")
-                    it.copy(
+            }.getOrNull()
-                        isLoading = false,
+            val checkedInBookings = checkedInBookingsResponse
-                        items = activeResponse.body().orEmpty(),
+                ?.body()
-                        checkedInBookings = bookingsResponse.body().orEmpty(),
+                .orEmpty()
-                        openBookings = openBookingsResponse.body().orEmpty(),
+                .takeIf { checkedInBookingsResponse?.isSuccessful == true }
-                        error = null
+                .orEmpty()
+            val openBookings = openBookingsResponse
+                ?.body()
+                .orEmpty()
+                .takeIf { openBookingsResponse?.isSuccessful == true }
+                .orEmpty()
+            val errorMessage = activeResult.exceptionOrNull()?.localizedMessage
+                ?: when {
+                    checkedInBookingsResponse != null && !checkedInBookingsResponse.isSuccessful ->
+                        "Load failed: ${checkedInBookingsResponse.code()}"
+
+                    openBookingsResponse != null && !openBookingsResponse.isSuccessful ->
+                        "Load failed: ${openBookingsResponse.code()}"
+
+                    else -> null
+                }
+            _state.update {
+                it.copy(
+                    isLoading = false,
+                    checkedInBookings = checkedInBookings,
+                    openBookings = openBookings,
+                    error = errorMessage
+                )
+            }
+        }
+    }
+
+    override fun onCleared() {
+        super.onCleared()
+        observeJob?.cancel()
+    }
+
+    private fun observeCache(propertyId: String) {
+        if (observePropertyId == propertyId && observeJob?.isActive == true) return
+        observeJob?.cancel()
+        observePropertyId = propertyId
+        observeJob = viewModelScope.launch {
+            repository.observeByProperty(propertyId = propertyId).collect { items ->
+                _state.update { current ->
+                    current.copy(
+                        items = items,
+                        isLoading = if (items.isNotEmpty()) false else current.isLoading
                     )
                 }
-            } else {
-                _state.update { it.copy(isLoading = false, error = "Load failed: ${activeResponse.code()}") }
             }
         }
     }

app/src/main/java/com/android/trisolarispms/ui/roomstay/BookingDetailsTabsScreen.kt

@@ -63,7 +63,6 @@ import com.android.trisolarispms.data.api.model.BookingBillingMode
 import com.android.trisolarispms.data.api.model.BookingCancelRequest
 import com.android.trisolarispms.data.api.model.BookingCheckOutRequest
 import com.android.trisolarispms.data.api.model.BookingDetailsResponse
-import com.android.trisolarispms.data.api.model.BookingExpectedDatesRequest
 import com.android.trisolarispms.ui.booking.BookingDatePickerDialog
 import com.android.trisolarispms.ui.booking.BookingDateTimeQuickEditorCard
 import com.android.trisolarispms.ui.booking.BookingTimePickerDialog
@@ -211,7 +210,6 @@ fun BookingDetailsTabsScreen(
                 when (page) {
                 0 -> GuestInfoTabContent(
                     propertyId = propertyId,
-                    bookingId = bookingId,
                     details = detailsState.details,
                     guestId = guestId,
                     isLoading = detailsState.isLoading,
@@ -219,7 +217,16 @@ fun BookingDetailsTabsScreen(
                     onEditGuestInfo = onEditGuestInfo,
                     onEditSignature = onEditSignature,
                     onOpenRazorpayQr = onOpenRazorpayQr,
-                    onOpenPayments = onOpenPayments
+                    onOpenPayments = onOpenPayments,
+                    onUpdateExpectedDates = { status, updatedCheckInAt, updatedCheckOutAt ->
+                        detailsViewModel.updateExpectedDates(
+                            propertyId = propertyId,
+                            bookingId = bookingId,
+                            status = status,
+                            updatedCheckInAt = updatedCheckInAt,
+                            updatedCheckOutAt = updatedCheckOutAt
+                        )
+                    }
                 )
                     1 -> BookingRoomStaysTabContent(
                         propertyId = propertyId,
@@ -394,7 +401,6 @@ fun BookingDetailsTabsScreen(
 @Composable
 private fun GuestInfoTabContent(
     propertyId: String,
-    bookingId: String,
     details: BookingDetailsResponse?,
     guestId: String?,
     isLoading: Boolean,
@@ -402,7 +408,8 @@ private fun GuestInfoTabContent(
     onEditGuestInfo: (String) -> Unit,
     onEditSignature: (String) -> Unit,
     onOpenRazorpayQr: (Long?, String?) -> Unit,
-    onOpenPayments: () -> Unit
+    onOpenPayments: () -> Unit,
+    onUpdateExpectedDates: suspend (String?, OffsetDateTime?, OffsetDateTime?) -> Result<Unit>
 ) {
     val displayZone = remember { ZoneId.of("Asia/Kolkata") }
     val dateFormatter = remember { DateTimeFormatter.ofPattern("dd/MM/yyyy") }
@@ -436,37 +443,18 @@ private fun GuestInfoTabContent(
     }
 
     fun submitExpectedDatesUpdate(updatedCheckInAt: OffsetDateTime?, updatedCheckOutAt: OffsetDateTime?) {
-        val bookingStatus = details?.status?.uppercase() ?: return
+        if (isUpdatingDates.value) return
+        val currentStatus = details?.status ?: return
+        val bookingStatus = currentStatus.uppercase()
         if (bookingStatus != "OPEN" && bookingStatus != "CHECKED_IN") return
         scope.launch {
             isUpdatingDates.value = true
             updateDatesError.value = null
-            try {
+            val result = onUpdateExpectedDates(currentStatus, updatedCheckInAt, updatedCheckOutAt)
-                val body = when (bookingStatus) {
+            result.exceptionOrNull()?.let { throwable ->
-                    "OPEN" -> BookingExpectedDatesRequest(
+                updateDatesError.value = throwable.localizedMessage ?: "Update failed"
-                        expectedCheckInAt = updatedCheckInAt?.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME),
-                        expectedCheckOutAt = updatedCheckOutAt?.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
-                    )
-                    else -> BookingExpectedDatesRequest(
-                        expectedCheckOutAt = updatedCheckOutAt?.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
-                    )
-                }
-                val response = ApiClient.create().updateExpectedDates(
-                    propertyId = propertyId,
-                    bookingId = bookingId,
-                    body = body
-                )
-                if (response.isSuccessful) {
-                    draftCheckInAt.value = updatedCheckInAt
-                    draftCheckOutAt.value = updatedCheckOutAt
-                } else {
-                    updateDatesError.value = "Update failed: ${response.code()}"
-                }
-            } catch (e: Exception) {
-                updateDatesError.value = e.localizedMessage ?: "Update failed"
-            } finally {
-                isUpdatingDates.value = false
             }
+            isUpdatingDates.value = false
         }
     }
 
@@ -528,25 +516,21 @@ private fun GuestInfoTabContent(
                     checkOutDateText = zonedCheckOut?.format(dateFormatter) ?: "--/--/----",
                     checkOutTimeText = zonedCheckOut?.format(timeFormatter) ?: "--:--",
                     totalTimeText = formatBookingDurationText(parsedCheckIn, parsedCheckOut),
-                    checkInEditable = canEditCheckIn,
+                    checkInEditable = canEditCheckIn && !isUpdatingDates.value,
-                    checkOutEditable = canEditCheckOut,
+                    checkOutEditable = canEditCheckOut && !isUpdatingDates.value,
                     onCheckInDateClick = {
-                        if (canEditCheckIn) showCheckInDatePicker.value = true
+                        if (canEditCheckIn && !isUpdatingDates.value) showCheckInDatePicker.value = true
                     },
                     onCheckInTimeClick = {
-                        if (canEditCheckIn) showCheckInTimePicker.value = true
+                        if (canEditCheckIn && !isUpdatingDates.value) showCheckInTimePicker.value = true
                     },
                     onCheckOutDateClick = {
-                        if (canEditCheckOut) showCheckOutDatePicker.value = true
+                        if (canEditCheckOut && !isUpdatingDates.value) showCheckOutDatePicker.value = true
                     },
                     onCheckOutTimeClick = {
-                        if (canEditCheckOut) showCheckOutTimePicker.value = true
+                        if (canEditCheckOut && !isUpdatingDates.value) showCheckOutTimePicker.value = true
                     }
                 )
-                if (isUpdatingDates.value) {
-                    Spacer(modifier = Modifier.height(8.dp))
-                    CircularProgressIndicator()
-                }
                 updateDatesError.value?.let { message ->
                     Spacer(modifier = Modifier.height(8.dp))
                     Text(

app/src/main/java/com/android/trisolarispms/ui/roomstay/BookingDetailsViewModel.kt

@@ -1,12 +1,17 @@
 package com.android.trisolarispms.ui.roomstay
 
-import androidx.lifecycle.ViewModel
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.android.trisolarispms.data.api.core.ApiClient
 import com.android.trisolarispms.data.api.core.ApiConstants
 import com.android.trisolarispms.data.api.model.BookingDetailsResponse
-import com.android.trisolarispms.core.viewmodel.launchRequest
+import com.android.trisolarispms.data.api.model.BookingExpectedDatesRequest
+import com.android.trisolarispms.data.local.booking.BookingDetailsRepository
+import com.android.trisolarispms.data.local.core.LocalDatabaseProvider
+import com.android.trisolarispms.data.local.roomstay.ActiveRoomStayRepository
 import com.google.gson.Gson
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
@@ -17,13 +22,25 @@ import okhttp3.Request
 import okhttp3.sse.EventSource
 import okhttp3.sse.EventSourceListener
 import okhttp3.sse.EventSources
+import java.time.OffsetDateTime
+import java.time.format.DateTimeFormatter
 
-class BookingDetailsViewModel : ViewModel() {
+class BookingDetailsViewModel(
+    application: Application
+) : AndroidViewModel(application) {
     private val _state = MutableStateFlow(BookingDetailsState())
     val state: StateFlow<BookingDetailsState> = _state
     private val gson = Gson()
+    private val bookingRepository = BookingDetailsRepository(
+        dao = LocalDatabaseProvider.get(application).bookingDetailsCacheDao()
+    )
+    private val roomStayRepository = ActiveRoomStayRepository(
+        dao = LocalDatabaseProvider.get(application).activeRoomStayCacheDao()
+    )
     private var eventSource: EventSource? = null
     private var streamKey: String? = null
+    private var observeKey: String? = null
+    private var observeJob: Job? = null
     private var lastPropertyId: String? = null
     private var lastBookingId: String? = null
     private var retryJob: Job? = null
@@ -31,25 +48,19 @@ class BookingDetailsViewModel : ViewModel() {
 
     fun load(propertyId: String, bookingId: String) {
         if (propertyId.isBlank() || bookingId.isBlank()) return
-        launchRequest(
+        observeCache(propertyId = propertyId, bookingId = bookingId)
-            state = _state,
+        _state.update { it.copy(isLoading = true, error = null) }
-            setLoading = { it.copy(isLoading = true, error = null) },
+        viewModelScope.launch {
-            setError = { current, message -> current.copy(isLoading = false, error = message) },
+            val result = bookingRepository.refreshBookingDetails(propertyId = propertyId, bookingId = bookingId)
-            defaultError = "Load failed"
+            result.fold(
-        ) {
+                onSuccess = {
-            val api = ApiClient.create()
+                    _state.update { current -> current.copy(isLoading = false, error = null) }
-            val response = api.getBookingDetails(propertyId, bookingId)
+                },
-            if (response.isSuccessful) {
+                onFailure = { throwable ->
-                _state.update {
+                    val message = throwable.localizedMessage ?: "Load failed"
-                    it.copy(
+                    _state.update { current -> current.copy(isLoading = false, error = message) }
-                        isLoading = false,
-                        details = response.body(),
-                        error = null
-                    )
                 }
-            } else {
+            )
-                _state.update { it.copy(isLoading = false, error = "Load failed: ${response.code()}") }
-            }
         }
     }
 
@@ -80,8 +91,15 @@ class BookingDetailsViewModel : ViewModel() {
                         null
                     }
                     if (details != null) {
-                        _state.update { it.copy(isLoading = false, details = details, error = null) }
+                        viewModelScope.launch {
-                        retryDelayMs = 2000
+                            bookingRepository.storeSnapshot(
+                                propertyId = propertyId,
+                                bookingId = bookingId,
+                                details = details
+                            )
+                            _state.update { current -> current.copy(isLoading = false, error = null) }
+                            retryDelayMs = 2000
+                        }
                     }
                 }
 
@@ -110,11 +128,64 @@ class BookingDetailsViewModel : ViewModel() {
         retryJob = null
     }
 
+    suspend fun updateExpectedDates(
+        propertyId: String,
+        bookingId: String,
+        status: String?,
+        updatedCheckInAt: OffsetDateTime?,
+        updatedCheckOutAt: OffsetDateTime?
+    ): Result<Unit> {
+        val bookingStatus = status?.uppercase()
+        val body = when (bookingStatus) {
+            "OPEN" -> BookingExpectedDatesRequest(
+                expectedCheckInAt = updatedCheckInAt?.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME),
+                expectedCheckOutAt = updatedCheckOutAt?.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
+            )
+
+            "CHECKED_IN" -> BookingExpectedDatesRequest(
+                expectedCheckOutAt = updatedCheckOutAt?.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
+            )
+
+            else -> return Result.failure(IllegalStateException("Expected dates are not editable"))
+        }
+        val result = bookingRepository.updateExpectedDates(
+            propertyId = propertyId,
+            bookingId = bookingId,
+            body = body
+        )
+        if (result.isSuccess) {
+            roomStayRepository.patchExpectedCheckoutForBooking(
+                propertyId = propertyId,
+                bookingId = bookingId,
+                expectedCheckoutAt = body.expectedCheckOutAt
+            )
+        }
+        return result
+    }
+
     override fun onCleared() {
         super.onCleared()
+        observeJob?.cancel()
         stopStream()
     }
 
+    private fun observeCache(propertyId: String, bookingId: String) {
+        val key = "$propertyId:$bookingId"
+        if (observeKey == key && observeJob?.isActive == true) return
+        observeJob?.cancel()
+        observeKey = key
+        observeJob = viewModelScope.launch {
+            bookingRepository.observeBookingDetails(propertyId = propertyId, bookingId = bookingId).collect { details ->
+                _state.update { current ->
+                    current.copy(
+                        details = details,
+                        isLoading = if (details != null) false else current.isLoading
+                    )
+                }
+            }
+        }
+    }
+
     private fun scheduleReconnect() {
         val propertyId = lastPropertyId ?: return
         val bookingId = lastBookingId ?: return

app/src/main/java/com/android/trisolarispms/ui/roomstay/BookingRoomStaysViewModel.kt

@@ -1,20 +1,29 @@
 package com.android.trisolarispms.ui.roomstay
 
-import androidx.lifecycle.ViewModel
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.android.trisolarispms.data.api.core.ApiClient
 import com.android.trisolarispms.data.api.model.BookingRoomStayCheckOutRequest
-import com.android.trisolarispms.core.viewmodel.launchRequest
+import com.android.trisolarispms.data.local.core.LocalDatabaseProvider
-import kotlinx.coroutines.async
+import com.android.trisolarispms.data.local.roomstay.ActiveRoomStayRepository
-import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 
-class BookingRoomStaysViewModel : ViewModel() {
+class BookingRoomStaysViewModel(
+    application: Application
+) : AndroidViewModel(application) {
     private val _state = MutableStateFlow(BookingRoomStaysState())
     val state: StateFlow<BookingRoomStaysState> = _state
+    private val repository = ActiveRoomStayRepository(
+        dao = LocalDatabaseProvider.get(application).activeRoomStayCacheDao()
+    )
+    private var observeJob: Job? = null
+    private var observeKey: String? = null
 
     fun toggleShowAll(value: Boolean) {
         _state.update { it.copy(showAll = value) }
@@ -22,38 +31,10 @@ class BookingRoomStaysViewModel : ViewModel() {
 
     fun load(propertyId: String, bookingId: String) {
         if (propertyId.isBlank() || bookingId.isBlank()) return
-        launchRequest(
+        observeBookingCache(propertyId = propertyId, bookingId = bookingId)
-            state = _state,
+        _state.update { it.copy(isLoading = true, error = null) }
-            setLoading = { it.copy(isLoading = true, error = null) },
+        viewModelScope.launch {
-            setError = { current, message -> current.copy(isLoading = false, error = message) },
+            refreshForBooking(propertyId = propertyId, bookingId = bookingId)
-            defaultError = "Load failed"
-        ) {
-            val api = ApiClient.create()
-            val (staysResponse, detailsResponse) = coroutineScope {
-                val staysDeferred = async { api.listActiveRoomStays(propertyId) }
-                val detailsDeferred = async { api.getBookingDetails(propertyId, bookingId) }
-                staysDeferred.await() to detailsDeferred.await()
-            }
-            if (!staysResponse.isSuccessful) {
-                _state.update { it.copy(isLoading = false, error = "Load failed: ${staysResponse.code()}") }
-                return@launchRequest
-            }
-
-            val filtered = staysResponse.body().orEmpty().filter { it.bookingId == bookingId }
-            val details = detailsResponse.body().takeIf { detailsResponse.isSuccessful }
-            val blockedReason = deriveBookingCheckoutBlockedReason(details)
-            _state.update { current ->
-                current.copy(
-                    isLoading = false,
-                    stays = filtered,
-                    error = null,
-                    checkoutBlockedReason = blockedReason,
-                    checkoutError = blockedReason,
-                    conflictRoomStayIds = current.conflictRoomStayIds.intersect(
-                        filtered.mapNotNull { stay -> stay.roomStayId }.toSet()
-                    )
-                )
-            }
         }
     }
 
@@ -81,9 +62,9 @@ class BookingRoomStaysViewModel : ViewModel() {
                 )
                 when {
                     response.isSuccessful -> {
+                        repository.removeFromCache(propertyId = propertyId, roomStayId = roomStayId)
                         _state.update { current ->
                             current.copy(
-                                stays = current.stays.filterNot { it.roomStayId == roomStayId },
                                 checkingOutRoomStayId = null,
                                 checkoutError = null,
                                 checkoutBlockedReason = null
@@ -115,6 +96,57 @@ class BookingRoomStaysViewModel : ViewModel() {
             }
         }
     }
+
+    override fun onCleared() {
+        super.onCleared()
+        observeJob?.cancel()
+    }
+
+    private fun observeBookingCache(propertyId: String, bookingId: String) {
+        val key = "$propertyId:$bookingId"
+        if (observeKey == key && observeJob?.isActive == true) return
+        observeJob?.cancel()
+        observeKey = key
+        observeJob = viewModelScope.launch {
+            repository.observeByBooking(propertyId = propertyId, bookingId = bookingId).collect { stays ->
+                val stayIds = stays.mapNotNull { it.roomStayId }.toSet()
+                _state.update { current ->
+                    current.copy(
+                        stays = stays,
+                        isLoading = if (stays.isNotEmpty()) false else current.isLoading,
+                        conflictRoomStayIds = current.conflictRoomStayIds.intersect(stayIds)
+                    )
+                }
+            }
+        }
+    }
+
+    private suspend fun refreshForBooking(
+        propertyId: String,
+        bookingId: String
+    ): Result<Unit> {
+        val activeResult = repository.refresh(propertyId = propertyId)
+        val detailsResponse = runCatching {
+            ApiClient.create().getBookingDetails(propertyId = propertyId, bookingId = bookingId)
+        }.getOrNull()
+        val details = detailsResponse?.body().takeIf { detailsResponse?.isSuccessful == true }
+        val blockedReason = deriveBookingCheckoutBlockedReason(details)
+        val errorMessage = activeResult.exceptionOrNull()?.localizedMessage
+            ?: if (detailsResponse != null && !detailsResponse.isSuccessful) {
+                "Load failed: ${detailsResponse.code()}"
+            } else {
+                null
+            }
+        _state.update { current ->
+            current.copy(
+                isLoading = false,
+                error = errorMessage,
+                checkoutBlockedReason = blockedReason,
+                checkoutError = blockedReason
+            )
+        }
+        return activeResult
+    }
 }
 
 private fun handleCheckoutConflict(

build.gradle.kts

@@ -1,6 +1,8 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
     alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.kotlin.android) apply false
     alias(libs.plugins.kotlin.compose) apply false
     alias(libs.plugins.google.services) apply false
+    alias(libs.plugins.ksp) apply false
 }

gradle.properties

@@ -21,6 +21,8 @@ kotlin.code.style=official
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
+android.builtInKotlin=false
+android.newDsl=false
 systemProp.java.net.preferIPv4Stack=true
 org.gradle.internal.http.connectionTimeout=600000
 org.gradle.internal.http.socketTimeout=600000

gradle/libs.versions.toml

@@ -23,6 +23,8 @@ lottieCompose = "6.7.1"
 calendarCompose = "2.6.0"
 libphonenumber = "8.13.34"
 zxingCore = "3.5.3"
+room = "2.8.4"
+ksp = "2.3.0"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -57,8 +59,13 @@ lottie-compose = { group = "com.airbnb.android", name = "lottie-compose", versio
 calendar-compose = { group = "com.kizitonwose.calendar", name = "compose", version.ref = "calendarCompose" }
 libphonenumber = { group = "com.googlecode.libphonenumber", name = "libphonenumber", version.ref = "libphonenumber" }
 zxing-core = { group = "com.google.zxing", name = "core", version.ref = "zxingCore" }
+androidx-room-runtime = { group = "androidx.room", name = "room-runtime", version.ref = "room" }
+androidx-room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
+androidx-room-compiler = { group = "androidx.room", name = "room-compiler", version.ref = "room" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
+kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 google-services = { id = "com.google.gms.google-services", version.ref = "googleServices" }
+ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }