Enable Offline mode of the SyncService, so that the sync starts automatically when the network is back.

Also rely on the sync state to render the "Offline" banner.

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/sync/SyncState.kt

@@ -14,3 +14,11 @@ enum class SyncState {
     Terminated,
     Offline,
 }
+
+fun SyncState.isConnected() = when (this) {
+    SyncState.Idle,
+    SyncState.Running,
+    SyncState.Error,
+    SyncState.Terminated -> true
+    SyncState.Offline -> false
+}

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClientFactory.kt

@@ -74,6 +74,7 @@ class RustMatrixClientFactory @Inject constructor(
 
         val syncService = client.syncService()
             .withUtdHook(UtdTracker(analyticsService))
+            .withOfflineMode()
             .finish()
 
         return RustMatrixClient(

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/di/SessionMatrixModule.kt

@@ -19,6 +19,7 @@ import io.element.android.libraries.matrix.api.notificationsettings.Notification
 import io.element.android.libraries.matrix.api.room.RoomMembershipObserver
 import io.element.android.libraries.matrix.api.roomdirectory.RoomDirectoryService
 import io.element.android.libraries.matrix.api.roomlist.RoomListService
+import io.element.android.libraries.matrix.api.sync.SyncService
 import io.element.android.libraries.matrix.api.verification.SessionVerificationService
 import kotlinx.coroutines.CoroutineScope
 
@@ -45,6 +46,11 @@ object SessionMatrixModule {
         return matrixClient.roomListService
     }
 
+    @Provides
+    fun providesSyncService(matrixClient: MatrixClient): SyncService {
+        return matrixClient.syncService()
+    }
+
     @Provides
     fun providesEncryptionService(matrixClient: MatrixClient): EncryptionService {
         return matrixClient.encryptionService()

libraries/matrix/impl/src/test/kotlin/io/element/android/libraries/matrix/impl/fixtures/fakes/FakeRustSyncServiceBuilder.kt

@@ -14,5 +14,6 @@ import org.matrix.rustcomponents.sdk.UnableToDecryptDelegate
 
 class FakeRustSyncServiceBuilder : SyncServiceBuilder(NoPointer) {
     override suspend fun withUtdHook(delegate: UnableToDecryptDelegate): SyncServiceBuilder = this
+    override fun withOfflineMode(): SyncServiceBuilder = this
     override suspend fun finish(): SyncService = FakeRustSyncService()
 }

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/sync/FakeSyncService.kt

@@ -13,8 +13,10 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 
 class FakeSyncService(
-    syncStateFlow: MutableStateFlow<SyncState> = MutableStateFlow(SyncState.Idle)
+    initialSyncState: SyncState = SyncState.Idle,
 ) : SyncService {
+    private val syncStateFlow: MutableStateFlow<SyncState> = MutableStateFlow(initialSyncState)
+
     var startSyncLambda: () -> Result<Unit> = { Result.success(Unit) }
     override suspend fun startSync(): Result<Unit> {
         return startSyncLambda()
@@ -26,4 +28,8 @@ class FakeSyncService(
     }
 
     override val syncState: StateFlow<SyncState> = syncStateFlow
+
+    suspend fun emitSyncState(syncState: SyncState) {
+        syncStateFlow.emit(syncState)
+    }
 }