porting message observing to the chat engine

app/src/main/kotlin/app/dapk/st/graph/AppModule.kt

@@ -177,11 +177,8 @@ internal class FeatureModules internal constructor(
     }
     val messengerModule by unsafeLazy {
         MessengerModule(
-            matrixModules.sync,
+            matrixModules.engine,
             matrixModules.message,
-            matrixModules.room,
-            storeModule.value.credentialsStore(),
-            storeModule.value.roomStore(),
             clock,
             context,
             base64,

chat-engine/src/main/kotlin/app/dapk/st/engine/ChatEngine.kt

@@ -10,6 +10,8 @@ interface ChatEngine {
 
     fun invites(): Flow<InviteState>
 
+    suspend fun messages(roomId: RoomId, disableReadReceipts: Boolean): Flow<MessengerState>
+
     suspend fun login(request: LoginRequest): LoginResult
 
     suspend fun me(forceRefresh: Boolean): Me

chat-engine/src/main/kotlin/app/dapk/st/engine/Models.kt

@@ -1,6 +1,10 @@
 package app.dapk.st.engine
 
 import app.dapk.st.matrix.common.*
+import java.time.Instant
+import java.time.ZoneId
+import java.time.ZonedDateTime
+import java.time.format.DateTimeFormatter
 
 typealias DirectoryState = List<DirectoryItem>
 typealias OverviewState = List<RoomOverview>
@@ -79,3 +83,118 @@ sealed interface ImportResult {
 
     data class Update(val importedKeysCount: Long) : ImportResult
 }
+
+data class MessengerState(
+    val self: UserId,
+    val roomState: RoomState,
+    val typing: Typing?
+)
+
+data class RoomState(
+    val roomOverview: RoomOverview,
+    val events: List<RoomEvent>,
+)
+
+internal val DEFAULT_ZONE = ZoneId.systemDefault()
+internal val MESSAGE_TIME_FORMAT = DateTimeFormatter.ofPattern("HH:mm")
+
+sealed class RoomEvent {
+
+    abstract val eventId: EventId
+    abstract val utcTimestamp: Long
+    abstract val author: RoomMember
+    abstract val meta: MessageMeta
+
+    data class Message(
+        override val eventId: EventId,
+        override val utcTimestamp: Long,
+        val content: String,
+        override val author: RoomMember,
+        override val meta: MessageMeta,
+        val edited: Boolean = false,
+        val redacted: Boolean = false,
+    ) : RoomEvent() {
+
+        val time: String by lazy(mode = LazyThreadSafetyMode.NONE) {
+            val instant = Instant.ofEpochMilli(utcTimestamp)
+            ZonedDateTime.ofInstant(instant, DEFAULT_ZONE).toLocalTime().format(MESSAGE_TIME_FORMAT)
+        }
+    }
+
+    data class Reply(
+        val message: RoomEvent,
+        val replyingTo: RoomEvent,
+    ) : RoomEvent() {
+
+        override val eventId: EventId = message.eventId
+        override val utcTimestamp: Long = message.utcTimestamp
+        override val author: RoomMember = message.author
+        override val meta: MessageMeta = message.meta
+
+        val replyingToSelf = replyingTo.author == message.author
+
+        val time: String by lazy(mode = LazyThreadSafetyMode.NONE) {
+            val instant = Instant.ofEpochMilli(utcTimestamp)
+            ZonedDateTime.ofInstant(instant, DEFAULT_ZONE).toLocalTime().format(MESSAGE_TIME_FORMAT)
+        }
+    }
+
+    data class Image(
+        override val eventId: EventId,
+        override val utcTimestamp: Long,
+        val imageMeta: ImageMeta,
+        override val author: RoomMember,
+        override val meta: MessageMeta,
+        val edited: Boolean = false,
+    ) : RoomEvent() {
+
+        val time: String by lazy(mode = LazyThreadSafetyMode.NONE) {
+            val instant = Instant.ofEpochMilli(utcTimestamp)
+            ZonedDateTime.ofInstant(instant, DEFAULT_ZONE).toLocalTime().format(MESSAGE_TIME_FORMAT)
+        }
+
+        data class ImageMeta(
+            val width: Int?,
+            val height: Int?,
+            val url: String,
+            val keys: Keys?,
+        ) {
+
+            data class Keys(
+                val k: String,
+                val iv: String,
+                val v: String,
+                val hashes: Map<String, String>,
+            )
+
+        }
+    }
+
+}
+
+sealed class MessageMeta {
+
+    object FromServer : MessageMeta()
+
+    data class LocalEcho(
+        val echoId: String,
+        val state: State
+    ) : MessageMeta() {
+
+        sealed class State {
+            object Sending : State()
+
+            object Sent : State()
+
+            data class Error(
+                val message: String,
+                val type: Type,
+            ) : State() {
+
+                enum class Type {
+                    UNKNOWN
+                }
+            }
+        }
+    }
+}

features/messenger/build.gradle

@@ -2,6 +2,7 @@ applyAndroidComposeLibraryModule(project)
 apply plugin: 'kotlin-parcelize'
 
 dependencies {
+    implementation project(":chat-engine")
     implementation project(":matrix:services:sync")
     implementation project(":matrix:services:message")
     implementation project(":matrix:services:crypto")

features/messenger/src/main/kotlin/app/dapk/st/messenger/MessengerModule.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import app.dapk.st.core.Base64
 import app.dapk.st.core.ProvidableModule
 import app.dapk.st.domain.application.message.MessageOptionsStore
+import app.dapk.st.engine.ChatEngine
 import app.dapk.st.matrix.common.CredentialsStore
 import app.dapk.st.matrix.common.RoomId
 import app.dapk.st.matrix.message.MessageService
@@ -14,11 +15,8 @@ import app.dapk.st.matrix.sync.SyncService
 import java.time.Clock
 
 class MessengerModule(
-    private val syncService: SyncService,
+    private val chatEngine: ChatEngine,
     private val messageService: MessageService,
-    private val roomService: RoomService,
-    private val credentialsStore: CredentialsStore,
-    private val roomStore: RoomStore,
     private val clock: Clock,
     private val context: Context,
     private val base64: Base64,
@@ -28,11 +26,8 @@ class MessengerModule(
 
     internal fun messengerViewModel(): MessengerViewModel {
         return MessengerViewModel(
+            chatEngine,
             messageService,
-            roomService,
-            roomStore,
-            credentialsStore,
-            timelineUseCase(),
             LocalIdFactory(),
             imageMetaReader,
             messageOptionsStore,
@@ -40,10 +35,5 @@ class MessengerModule(
         )
     }
 
-    private fun timelineUseCase(): TimelineUseCaseImpl {
-        val mergeWithLocalEchosUseCase = MergeWithLocalEchosUseCaseImpl(LocalEchoMapper(MetaMapper()))
-        return TimelineUseCaseImpl(syncService, messageService, roomService, mergeWithLocalEchosUseCase)
-    }
-
     internal fun decryptingFetcherFactory(roomId: RoomId) = DecryptingFetcherFactory(context, base64, roomId)
 }

features/messenger/src/main/kotlin/app/dapk/st/messenger/MessengerScreen.kt

@@ -44,12 +44,12 @@ import app.dapk.st.core.StartObserving
 import app.dapk.st.core.components.CenteredLoading
 import app.dapk.st.core.extensions.takeIfContent
 import app.dapk.st.design.components.*
+import app.dapk.st.engine.MessageMeta
+import app.dapk.st.engine.MessengerState
+import app.dapk.st.engine.RoomEvent
+import app.dapk.st.engine.RoomState
 import app.dapk.st.matrix.common.RoomId
 import app.dapk.st.matrix.common.UserId
-import app.dapk.st.matrix.sync.MessageMeta
-import app.dapk.st.matrix.sync.RoomEvent
-import app.dapk.st.matrix.sync.RoomEvent.Message
-import app.dapk.st.matrix.sync.RoomState
 import app.dapk.st.messenger.gallery.ImageGalleryActivityPayload
 import app.dapk.st.navigator.MessageAttachment
 import app.dapk.st.navigator.Navigator
@@ -196,7 +196,7 @@ private fun ColumnScope.RoomContent(self: UserId, state: RoomState, replyActions
             AlignedBubble(item, self, wasPreviousMessageSameSender, replyActions) {
                 when (item) {
                     is RoomEvent.Image -> MessageImage(it as BubbleContent<RoomEvent.Image>)
-                    is Message -> TextBubbleContent(it as BubbleContent<RoomEvent.Message>)
+                    is RoomEvent.Message -> TextBubbleContent(it as BubbleContent<RoomEvent.Message>)
                     is RoomEvent.Reply -> ReplyBubbleContent(it as BubbleContent<RoomEvent.Reply>)
                 }
             }
@@ -482,7 +482,7 @@ private fun ReplyBubbleContent(content: BubbleContent<RoomEvent.Reply>) {
                     )
                     Spacer(modifier = Modifier.height(2.dp))
                     when (val replyingTo = content.message.replyingTo) {
-                        is Message -> {
+                        is RoomEvent.Message -> {
                             Text(
                                 text = replyingTo.content,
                                 color = content.textColor().copy(alpha = 0.8f),
@@ -525,7 +525,7 @@ private fun ReplyBubbleContent(content: BubbleContent<RoomEvent.Reply>) {
                     )
                 }
                 when (val message = content.message.message) {
-                    is Message -> {
+                    is RoomEvent.Message -> {
                         Text(
                             text = message.content,
                             color = content.textColor(),
@@ -642,7 +642,7 @@ private fun TextComposer(state: ComposerState.Text, onTextChange: (String) -> Un
                         )
                 }
             ) {
-                if (it is Message) {
+                if (it is RoomEvent.Message) {
                     Box(Modifier.padding(12.dp)) {
                         Box(Modifier.padding(8.dp).clickable { replyActions.onDismiss() }.wrapContentWidth().align(Alignment.TopEnd)) {
                             Icon(

features/messenger/src/main/kotlin/app/dapk/st/messenger/MessengerState.kt

@@ -1,8 +1,9 @@
 package app.dapk.st.messenger
 
 import app.dapk.st.core.Lce
+import app.dapk.st.engine.MessengerState
+import app.dapk.st.engine.RoomEvent
 import app.dapk.st.matrix.common.RoomId
-import app.dapk.st.matrix.sync.RoomEvent
 import app.dapk.st.navigator.MessageAttachment
 
 data class MessengerScreenState(

features/messenger/src/main/kotlin/app/dapk/st/messenger/MessengerViewModel.kt

@@ -4,31 +4,24 @@ import androidx.lifecycle.viewModelScope
 import app.dapk.st.core.Lce
 import app.dapk.st.core.extensions.takeIfContent
 import app.dapk.st.domain.application.message.MessageOptionsStore
-import app.dapk.st.matrix.common.CredentialsStore
+import app.dapk.st.engine.ChatEngine
-import app.dapk.st.matrix.common.EventId
+import app.dapk.st.engine.RoomEvent
 import app.dapk.st.matrix.common.RoomId
-import app.dapk.st.matrix.common.UserId
 import app.dapk.st.matrix.message.MessageService
 import app.dapk.st.matrix.message.internal.ImageContentReader
-import app.dapk.st.matrix.room.RoomService
-import app.dapk.st.matrix.sync.RoomEvent
-import app.dapk.st.matrix.sync.RoomStore
 import app.dapk.st.navigator.MessageAttachment
 import app.dapk.st.viewmodel.DapkViewModel
 import app.dapk.st.viewmodel.MutableStateFactory
 import app.dapk.st.viewmodel.defaultStateFactory
-import kotlinx.coroutines.*
+import kotlinx.coroutines.Job
-import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.launch
 import java.time.Clock
 
 internal class MessengerViewModel(
+    private val chatEngine: ChatEngine,
     private val messageService: MessageService,
-    private val roomService: RoomService,
-    private val roomStore: RoomStore,
-    private val credentialsStore: CredentialsStore,
-    private val observeTimeline: ObserveTimelineUseCase,
     private val localIdFactory: LocalIdFactory,
     private val imageContentReader: ImageContentReader,
     private val messageOptionsStore: MessageOptionsStore,
@@ -83,29 +76,10 @@ internal class MessengerViewModel(
 
     private fun start(action: MessengerAction.OnMessengerVisible) {
         updateState { copy(roomId = action.roomId, composerState = action.attachments?.let { ComposerState.Attachments(it, null) } ?: composerState) }
-        syncJob = viewModelScope.launch {
+        viewModelScope.launch {
-            roomStore.markRead(action.roomId)
+            syncJob = chatEngine.messages(action.roomId, disableReadReceipts = messageOptionsStore.isReadReceiptsDisabled())
-
+                .onEach { updateState { copy(roomState = Lce.Content(it)) } }
-            val credentials = credentialsStore.credentials()!!
+                .launchIn(this)
-            var lastKnownReadEvent: EventId? = null
-            observeTimeline.invoke(action.roomId, credentials.userId).distinctUntilChanged().onEach { state ->
-                state.latestMessageEventFromOthers(self = credentials.userId)?.let {
-                    if (lastKnownReadEvent != it) {
-                        updateRoomReadStateAsync(latestReadEvent = it, state)
-                        lastKnownReadEvent = it
-                    }
-                }
-                updateState { copy(roomState = Lce.Content(state)) }
-            }.collect()
-        }
-    }
-
-    private fun CoroutineScope.updateRoomReadStateAsync(latestReadEvent: EventId, state: MessengerState): Deferred<Unit> {
-        return async {
-            runCatching {
-                roomService.markFullyRead(state.roomState.roomOverview.roomId, latestReadEvent, isPrivate = messageOptionsStore.isReadReceiptsDisabled())
-                roomStore.markRead(state.roomState.roomOverview.roomId)
-            }
         }
     }
 
@@ -190,12 +164,6 @@ internal class MessengerViewModel(
 
 }
 
-private fun MessengerState.latestMessageEventFromOthers(self: UserId) = this.roomState.events
-    .filterIsInstance<RoomEvent.Message>()
-    .filterNot { it.author.id == self }
-    .firstOrNull()
-    ?.eventId
-
 sealed interface MessengerAction {
     data class ComposerTextUpdate(val newValue: String) : MessengerAction
     data class ComposerEnterReplyMode(val replyingTo: RoomEvent) : MessengerAction

matrix-chat-engine/src/main/kotlin/app/dapk/st/engine/LocalEchoMapper.kt

@@ -1,10 +1,8 @@
-package app.dapk.st.messenger
+package app.dapk.st.engine
 
 import app.dapk.st.matrix.common.EventId
 import app.dapk.st.matrix.common.RoomMember
 import app.dapk.st.matrix.message.MessageService
-import app.dapk.st.matrix.sync.MessageMeta
-import app.dapk.st.matrix.sync.RoomEvent
 
 internal class LocalEchoMapper(private val metaMapper: MetaMapper) {
 

matrix-chat-engine/src/main/kotlin/app/dapk/st/engine/LocalIdFactory.kt

@@ -0,0 +1,7 @@
+package app.dapk.st.engine
+
+import java.util.*
+
+internal class LocalIdFactory {
+    fun create() = "local.${UUID.randomUUID()}"
+}

matrix-chat-engine/src/main/kotlin/app/dapk/st/engine/MappingExtensions.kt

@@ -7,8 +7,11 @@ import app.dapk.st.matrix.auth.AuthService.LoginResult as MatrixLoginResult
 import app.dapk.st.matrix.crypto.ImportResult as MatrixImportResult
 import app.dapk.st.matrix.room.ProfileService.Me as MatrixMe
 import app.dapk.st.matrix.sync.LastMessage as MatrixLastMessage
+import app.dapk.st.matrix.sync.MessageMeta as MatrixMessageMeta
+import app.dapk.st.matrix.sync.RoomEvent as MatrixRoomEvent
 import app.dapk.st.matrix.sync.RoomInvite as MatrixRoomInvite
 import app.dapk.st.matrix.sync.RoomOverview as MatrixRoomOverview
+import app.dapk.st.matrix.sync.RoomState as MatrixRoomState
 import app.dapk.st.matrix.sync.SyncService.SyncEvent.Typing as MatrixTyping
 
 fun MatrixRoomOverview.engine() = RoomOverview(
@@ -77,3 +80,37 @@ fun MatrixImportResult.engine() = when (this) {
     is MatrixImportResult.Success -> ImportResult.Success(this.roomIds, this.totalImportedKeysCount)
     is MatrixImportResult.Update -> ImportResult.Update(this.importedKeysCount)
 }
+
+fun MatrixRoomState.engine() = RoomState(
+    this.roomOverview.engine(),
+    this.events.map { it.engine() }
+)
+
+fun MatrixRoomEvent.engine(): RoomEvent = when (this) {
+    is MatrixRoomEvent.Image -> RoomEvent.Image(this.eventId, this.utcTimestamp, this.imageMeta.engine(), this.author, this.meta.engine(), this.edited)
+    is MatrixRoomEvent.Message -> RoomEvent.Message(this.eventId, this.utcTimestamp, this.content, this.author, this.meta.engine(), this.edited, this.redacted)
+    is MatrixRoomEvent.Reply -> RoomEvent.Reply(this.message.engine(), this.replyingTo.engine())
+}
+
+fun MatrixRoomEvent.Image.ImageMeta.engine() = RoomEvent.Image.ImageMeta(
+    this.width,
+    this.height,
+    this.url,
+    this.keys?.let { RoomEvent.Image.ImageMeta.Keys(it.k, it.iv, it.v, it.hashes) }
+)
+
+fun MatrixMessageMeta.engine() = when (this) {
+    MatrixMessageMeta.FromServer -> MessageMeta.FromServer
+    is MatrixMessageMeta.LocalEcho -> MessageMeta.LocalEcho(
+        this.echoId, when (val echo = this.state) {
+            is MatrixMessageMeta.LocalEcho.State.Error -> MessageMeta.LocalEcho.State.Error(
+                echo.message, when (echo.type) {
+                    MatrixMessageMeta.LocalEcho.State.Error.Type.UNKNOWN -> MessageMeta.LocalEcho.State.Error.Type.UNKNOWN
+                }
+            )
+
+            MatrixMessageMeta.LocalEcho.State.Sending -> MessageMeta.LocalEcho.State.Sending
+            MatrixMessageMeta.LocalEcho.State.Sent -> MessageMeta.LocalEcho.State.Sent
+        }
+    )
+}

matrix-chat-engine/src/main/kotlin/app/dapk/st/engine/MatrixEngine.kt

@@ -36,6 +36,7 @@ import java.time.Clock
 class MatrixEngine internal constructor(
     private val directoryUseCase: Lazy<DirectoryUseCase>,
     private val matrix: Lazy<MatrixClient>,
+    private val timelineUseCase: Lazy<ReadMarkingTimeline>,
 ) : ChatEngine {
 
     override fun directory() = directoryUseCase.value.state()
@@ -43,6 +44,10 @@ class MatrixEngine internal constructor(
         return matrix.value.syncService().invites().map { it.map { it.engine() } }
     }
 
+    override suspend fun messages(roomId: RoomId, disableReadReceipts: Boolean): Flow<MessengerState> {
+        return timelineUseCase.value.foo(roomId, isReadReceiptsDisabled = disableReadReceipts)
+    }
+
     override suspend fun login(request: LoginRequest): LoginResult {
         return matrix.value.authService().login(request.engine()).engine()
     }
@@ -116,8 +121,14 @@ class MatrixEngine internal constructor(
                     roomStore
                 )
             }
+            val timelineUseCase = unsafeLazy {
+                val matrix = lazyMatrix.value
+                val mergeWithLocalEchosUseCase = MergeWithLocalEchosUseCaseImpl(LocalEchoMapper(MetaMapper()))
+                val timeline = TimelineUseCaseImpl(matrix.syncService(), matrix.messageService(), matrix.roomService(), mergeWithLocalEchosUseCase)
+                ReadMarkingTimeline(roomStore, credentialsStore, timeline, matrix.roomService())
+            }
 
-            return MatrixEngine(directoryUseCase, lazyMatrix)
+            return MatrixEngine(directoryUseCase, lazyMatrix, timelineUseCase)
 
         }
 

matrix-chat-engine/src/main/kotlin/app/dapk/st/engine/MergeWithLocalEchosUseCase.kt

@@ -1,10 +1,8 @@
-package app.dapk.st.messenger
+package app.dapk.st.engine
 
 import app.dapk.st.matrix.common.EventId
 import app.dapk.st.matrix.common.RoomMember
 import app.dapk.st.matrix.message.MessageService
-import app.dapk.st.matrix.sync.RoomEvent
-import app.dapk.st.matrix.sync.RoomState
 
 internal typealias MergeWithLocalEchosUseCase = (RoomState, RoomMember, List<MessageService.LocalEcho>) -> RoomState
 

matrix-chat-engine/src/main/kotlin/app/dapk/st/engine/ReadMarkingTimeline.kt

@@ -0,0 +1,55 @@
+package app.dapk.st.engine
+
+import app.dapk.st.matrix.common.CredentialsStore
+import app.dapk.st.matrix.common.EventId
+import app.dapk.st.matrix.common.RoomId
+import app.dapk.st.matrix.common.UserId
+import app.dapk.st.matrix.room.RoomService
+import app.dapk.st.matrix.sync.RoomEvent
+import app.dapk.st.matrix.sync.RoomStore
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.onEach
+
+class ReadMarkingTimeline(
+    private val roomStore: RoomStore,
+    private val credentialsStore: CredentialsStore,
+    private val observeTimelineUseCase: ObserveTimelineUseCase,
+    private val roomService: RoomService,
+) {
+
+    suspend fun foo(roomId: RoomId, isReadReceiptsDisabled: Boolean): Flow<MessengerState> {
+        var lastKnownReadEvent: EventId? = null
+        val credentials = credentialsStore.credentials()!!
+        roomStore.markRead(roomId)
+        return observeTimelineUseCase.invoke(roomId, credentials.userId).distinctUntilChanged().onEach { state ->
+            state.latestMessageEventFromOthers(self = credentials.userId)?.let {
+                if (lastKnownReadEvent != it) {
+                    updateRoomReadStateAsync(latestReadEvent = it, state, isReadReceiptsDisabled)
+                    lastKnownReadEvent = it
+                }
+            }
+        }
+    }
+
+    private suspend fun updateRoomReadStateAsync(latestReadEvent: EventId, state: MessengerState, isReadReceiptsDisabled: Boolean): Deferred<*> {
+        return coroutineScope {
+            async {
+                runCatching {
+                    roomService.markFullyRead(state.roomState.roomOverview.roomId, latestReadEvent, isPrivate = isReadReceiptsDisabled)
+                    roomStore.markRead(state.roomState.roomOverview.roomId)
+                }
+            }
+        }
+    }
+
+}
+
+private fun MessengerState.latestMessageEventFromOthers(self: UserId) = this.roomState.events
+    .filterIsInstance<RoomEvent.Message>()
+    .filterNot { it.author.id == self }
+    .firstOrNull()
+    ?.eventId

matrix-chat-engine/src/main/kotlin/app/dapk/st/engine/TimelineUseCase.kt

@@ -1,4 +1,4 @@
-package app.dapk.st.messenger
+package app.dapk.st.engine
 
 import app.dapk.st.core.extensions.startAndIgnoreEmissions
 import app.dapk.st.matrix.common.RoomId
@@ -6,10 +6,10 @@ import app.dapk.st.matrix.common.RoomMember
 import app.dapk.st.matrix.common.UserId
 import app.dapk.st.matrix.message.MessageService
 import app.dapk.st.matrix.room.RoomService
-import app.dapk.st.matrix.sync.RoomState
 import app.dapk.st.matrix.sync.SyncService
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.map
 
 internal typealias ObserveTimelineUseCase = (RoomId, UserId) -> Flow<MessengerState>
 
@@ -37,7 +37,7 @@ internal class TimelineUseCaseImpl(
                         )
                     }
                 },
-                typing = events.filterIsInstance<SyncService.SyncEvent.Typing>().firstOrNull { it.roomId == roomId },
+                typing = events.filterIsInstance<SyncService.SyncEvent.Typing>().firstOrNull { it.roomId == roomId }?.engine(),
                 self = userId,
             )
         }
@@ -45,14 +45,8 @@ internal class TimelineUseCaseImpl(
 
     private fun roomDatasource(roomId: RoomId) = combine(
         syncService.startSyncing().startAndIgnoreEmissions(),
-        syncService.room(roomId)
+        syncService.room(roomId).map { it.engine()  }
     ) { _, room -> room }
 }
 
 private fun UserId.toFallbackMember() = RoomMember(this, displayName = null, avatarUrl = null)
-
-data class MessengerState(
-    val self: UserId,
-    val roomState: RoomState,
-    val typing: SyncService.SyncEvent.Typing?
-)