chore: fix app crash when create new room via QR (#3)

Reviewed-on: #3

composeApp/src/androidMain/kotlin/su/reya/coop/screens/ChatScreen.kt

@@ -68,8 +68,19 @@ fun ChatScreen(
     val snackbarHostState = LocalSnackbarHostState.current
     val viewModel = LocalNostrViewModel.current
 
-    val room = viewModel.getChatRoom(id)
     val listState = rememberLazyListState()
+    val chatRooms by viewModel.chatRooms.collectAsState()
+    val room = remember(chatRooms, id) { chatRooms.firstOrNull { it.id == id } }
+
+    if (room == null) {
+        Box(
+            modifier = Modifier.fillMaxSize(),
+            contentAlignment = Alignment.Center
+        ) {
+            LoadingIndicator()
+        }
+        return
+    }
 
     val displayName by remember(room) { room.displayNameFlow(viewModel) }.collectAsState("Loading...")
     val picture by remember(room) { room.pictureFlow(viewModel) }.collectAsState(null)

composeApp/src/androidMain/kotlin/su/reya/coop/screens/HomeScreen.kt

@@ -58,7 +58,6 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
-import androidx.compose.ui.platform.LocalClipboard
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import coop.composeapp.generated.resources.Res
@@ -85,7 +84,6 @@ fun HomeScreen(
     onOpenChat: (Long) -> Unit,
     onNewChat: () -> Unit,
 ) {
-    val clipboard = LocalClipboard.current
     val navController = LocalNavController.current
     val snackbarHostState = LocalSnackbarHostState.current
     val viewModel = LocalNostrViewModel.current
@@ -112,15 +110,21 @@ fun HomeScreen(
         ?: remember { mutableStateOf(null) }
 
     LaunchedEffect(Unit) {
+        if (qrResult == null) {
             viewModel.getChatRooms()
         }
+    }
 
     LaunchedEffect(qrResult) {
         qrResult?.let { result ->
             runCatching { PublicKey.parse(result) }
                 .onSuccess { pubkey ->
+                    try {
                         val roomId = viewModel.createChatRoom(listOf(pubkey))
                         navController.navigate(Screen.Chat(roomId))
+                    } catch (e: Exception) {
+                        e.message?.let { snackbarHostState.showSnackbar(it) }
+                    }
                 }
                 .onFailure { e -> println("Failed to parse QR: ${e.message}") }
 

composeApp/src/androidMain/kotlin/su/reya/coop/screens/ScanScreen.kt

@@ -76,7 +76,6 @@ fun ScanScreen(
             ScannerWithPermissions(
                 modifier = Modifier.fillMaxSize(),
                 onScanned = {
-                    println("Scanned: $it");
                     onResult(it)
                     true
                 },

shared/src/commonMain/kotlin/su/reya/coop/NostrViewModel.kt

@@ -14,6 +14,7 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.receiveAsFlow
+import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeoutOrNull
@@ -406,6 +407,7 @@ class NostrViewModel(
     }
 
     fun createChatRoom(to: List<PublicKey>): Long {
+        try {
             if (nostr.signer.currentUser == null) throw IllegalStateException("User not signed in")
             if (to.isEmpty()) throw IllegalArgumentException("At least one recipient is required")
 
@@ -417,9 +419,14 @@ class NostrViewModel(
 
             // Create a room from the rumor event
             val room = Room.new(rumor, nostr.signer.currentUser!!)
-        _chatRooms.value += room
+            _chatRooms.update { currentRooms ->
+                currentRooms + room
+            }
 
             return room.id
+        } catch (e: Exception) {
+            throw IllegalArgumentException("Failed to create room: ${e.message}")
+        }
     }
 
     fun getChatRoom(id: Long): Room {
@@ -429,10 +436,12 @@ class NostrViewModel(
 
     fun getChatRooms() {
         viewModelScope.launch {
-            try {
-                _chatRooms.value = nostr.getChatRooms() ?: emptySet()
-            } catch (e: Exception) {
-                showError("Error: ${e.message}")
+            val rooms = nostr.getChatRooms() ?: emptySet()
+            _chatRooms.update { currentRooms ->
+                val virtualRooms = currentRooms.filter { local ->
+                    rooms.none { db -> db.id == local.id }
+                }
+                rooms + virtualRooms
             }
         }
     }