feat: snackbar after sync (synced N / nothing to sync / server unreachable)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/kotlin/me/hgsky/synq/data/sync/SyncService.kt

@@ -7,8 +7,9 @@ import me.hgsky.synq.data.db.CaptureDao
 import java.time.OffsetDateTime
 import java.time.format.DateTimeFormatter
 
-suspend fun syncPending(dao: CaptureDao, client: SynqApiClient, settings: SynqSettings) {
+suspend fun syncPending(dao: CaptureDao, client: SynqApiClient, settings: SynqSettings): Int {
     val pending = dao.getPendingAndFailed()
+    var synced = 0
     for (capture in pending) {
         dao.updateStatus(capture.id, "syncing", null)
         val result = client.postCapture(capture, settings)
@@ -16,8 +17,10 @@ suspend fun syncPending(dao: CaptureDao, client: SynqApiClient, settings: SynqSe
             is PostResult.Accepted, is PostResult.AlreadySeen -> {
                 val now = OffsetDateTime.now().format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
                 dao.markSynced(capture.id, now)
+                synced++
             }
             is PostResult.Failed -> dao.updateStatus(capture.id, "failed", result.error)
         }
     }
+    return synced
 }

android/app/src/main/kotlin/me/hgsky/synq/ui/capture/CaptureScreen.kt

@@ -30,6 +30,8 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
@@ -62,9 +64,13 @@ fun CaptureScreen(
     val recentTags by vm.recentTags.collectAsState()
     val lastSyncedAt by vm.lastSyncedAt.collectAsState()
     val focusRequester = remember { FocusRequester() }
+    val snackbarState = remember { SnackbarHostState() }
     val context = LocalContext.current
 
     LaunchedEffect(Unit) { focusRequester.requestFocus() }
+    LaunchedEffect(Unit) {
+        vm.snackbar.collect { msg -> snackbarState.showSnackbar(msg) }
+    }
     LaunchedEffect(prefill) {
         if (!prefill.isNullOrEmpty()) vm.setBody(prefill)
     }
@@ -83,6 +89,7 @@ fun CaptureScreen(
     }
 
     Scaffold(
+        snackbarHost = { SnackbarHost(snackbarState) },
         topBar = {
             TopAppBar(
                 title = { Text("synq") },

android/app/src/main/kotlin/me/hgsky/synq/ui/capture/CaptureViewModel.kt

@@ -4,9 +4,11 @@ import android.app.Application
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.map
@@ -37,6 +39,9 @@ class CaptureViewModel(app: Application) : AndroidViewModel(app) {
     private val _state = MutableStateFlow(CaptureUiState())
     val state: StateFlow<CaptureUiState> = _state.asStateFlow()
 
+    private val _snackbar = MutableSharedFlow<String>(extraBufferCapacity = 1)
+    val snackbar = _snackbar.asSharedFlow()
+
     val recentTags: StateFlow<List<String>> = dao.getRecentTagsJson()
         .map { jsonList ->
             val seen = LinkedHashSet<String>()
@@ -93,9 +98,12 @@ class CaptureViewModel(app: Application) : AndroidViewModel(app) {
             try {
                 val settings = synqApp.settings.settings.first()
                 val client = SynqApiClient()
-                if (client.checkHealth(settings.serverUrl)) {
+                if (!client.checkHealth(settings.serverUrl)) {
-                    syncPending(dao, client, settings)
+                    _snackbar.tryEmit("server unreachable")
+                    return@launch
                 }
+                val synced = syncPending(dao, client, settings)
+                _snackbar.tryEmit(if (synced == 0) "nothing to sync" else "synced $synced")
             } finally {
                 _state.value = _state.value.copy(isSyncing = false)
             }