feat: enhance login flow with error handling and user feedback

app/src/main/java/hu/bbara/purefin/PurefinActivity.kt

@@ -11,6 +11,9 @@ import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.viewmodel.navigation3.rememberViewModelStoreNavEntryDecorator
@@ -30,6 +33,7 @@ import coil3.util.DebugLogger
 import dagger.hilt.android.AndroidEntryPoint
 import hu.bbara.purefin.client.JellyfinApiClient
 import hu.bbara.purefin.client.JellyfinAuthInterceptor
+import hu.bbara.purefin.common.ui.PurefinWaitingScreen
 import hu.bbara.purefin.login.ui.LoginScreen
 import hu.bbara.purefin.navigation.LocalNavigationManager
 import hu.bbara.purefin.navigation.NavigationCommand
@@ -126,8 +130,20 @@ class PurefinActivity : ComponentActivity() {
         entryBuilders: Set<@JvmSuppressWildcards EntryProviderScope<Route>.() -> Unit>,
         navigationManager: NavigationManager
     ) {
-
+        var sessionLoaded by remember { mutableStateOf(false) }
         val isLoggedIn by userSessionRepository.isLoggedIn.collectAsState(initial = false)
+
+        LaunchedEffect(Unit) {
+            userSessionRepository.isLoggedIn.collect {
+                sessionLoaded = true
+            }
+        }
+
+        if (!sessionLoaded) {
+            PurefinWaitingScreen(modifier = Modifier.fillMaxSize())
+            return
+        }
+
         if (isLoggedIn) {
             @Suppress("UNCHECKED_CAST")
             val backStack = rememberNavBackStack(Route.Home) as NavBackStack<Route>

app/src/main/java/hu/bbara/purefin/client/JellyfinApiClient.kt

@@ -71,16 +71,21 @@ class JellyfinApiClient @Inject constructor(
             return false
         }
         api.update(baseUrl = trimmedUrl)
-        val response = api.userApi.authenticateUserByName(username = username, password = password)
-        val authResult = response.content
+        return try {
+            val response = api.userApi.authenticateUserByName(username = username, password = password)
+            val authResult = response.content
 
-        val token = authResult.accessToken ?: return false
-        val userId = authResult.user?.id ?: return false
-        userSessionRepository.setAccessToken(accessToken = token)
-        userSessionRepository.setUserId(userId)
-        userSessionRepository.setLoggedIn(true)
-        api.update(accessToken = token)
-        return true
+            val token = authResult.accessToken ?: return false
+            val userId = authResult.user?.id ?: return false
+            userSessionRepository.setAccessToken(accessToken = token)
+            userSessionRepository.setUserId(userId)
+            userSessionRepository.setLoggedIn(true)
+            api.update(accessToken = token)
+            true
+        } catch (e: Exception) {
+            Log.e("JellyfinApiClient", "Login failed", e)
+            false
+        }
     }
 
     suspend fun updateApiClient() {

app/src/main/java/hu/bbara/purefin/data/local/room/MediaDatabaseModule.kt

@@ -16,7 +16,7 @@ object MediaDatabaseModule {
     @Provides
     @Singleton
     fun provideDatabase(@ApplicationContext context: Context): MediaDatabase =
-        Room.inMemoryDatabaseBuilder(context, MediaDatabase::class.java)
+        Room.databaseBuilder(context, MediaDatabase::class.java, "media_database")
             .fallbackToDestructiveMigration()
             .build()
 

app/src/main/java/hu/bbara/purefin/login/ui/LoginScreen.kt

@@ -55,6 +55,7 @@ fun LoginScreen(
     val serverUrl by viewModel.url.collectAsState()
     val username by viewModel.username.collectAsState()
     val password by viewModel.password.collectAsState()
+    val errorMessage by viewModel.errorMessage.collectAsState()
     var isLoggingIn by remember { mutableStateOf(false) }
 
     val coroutineScope = rememberCoroutineScope()
@@ -120,10 +121,29 @@ fun LoginScreen(
                     .padding(bottom = 24.dp)
             )
 
+            if (errorMessage != null) {
+                Text(
+                    text = errorMessage!!,
+                    color = scheme.error,
+                    fontSize = 14.sp,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .background(
+                            scheme.errorContainer,
+                            RoundedCornerShape(8.dp)
+                        )
+                        .padding(12.dp)
+                )
+                Spacer(modifier = Modifier.height(16.dp))
+            }
+
             PurefinComplexTextField(
                 label = "Server URL",
                 value = serverUrl,
-                onValueChange = { viewModel.setUrl(it) },
+                onValueChange = {
+                    viewModel.clearError()
+                    viewModel.setUrl(it)
+                },
                 placeholder = "http://192.168.1.100:8096",
                 leadingIcon = Icons.Default.Storage
             )
@@ -133,7 +153,10 @@ fun LoginScreen(
             PurefinComplexTextField(
                 label = "Username",
                 value = username,
-                onValueChange = { viewModel.setUsername(it) },
+                onValueChange = {
+                    viewModel.clearError()
+                    viewModel.setUsername(it)
+                },
                 placeholder = "Enter your username",
                 leadingIcon = Icons.Default.Person
             )
@@ -143,7 +166,10 @@ fun LoginScreen(
             PurefinPasswordField(
                 label = "Password",
                 value = password,
-                onValueChange = { viewModel.setPassword(it) },
+                onValueChange = {
+                    viewModel.clearError()
+                    viewModel.setPassword(it)
+                },
                 placeholder = "••••••••",
                 leadingIcon = Icons.Default.Lock,
             )

app/src/main/java/hu/bbara/purefin/login/viewmodel/LoginViewModel.kt

@@ -23,6 +23,8 @@ class LoginViewModel @Inject constructor(
     val password: StateFlow<String> = _password.asStateFlow()
     private val _url = MutableStateFlow("")
     val url: StateFlow<String> = _url.asStateFlow()
+    private val _errorMessage = MutableStateFlow<String?>(null)
+    val errorMessage: StateFlow<String?> = _errorMessage.asStateFlow()
 
     init {
         viewModelScope.launch {
@@ -42,6 +44,10 @@ class LoginViewModel @Inject constructor(
         _password.value = password
     }
 
+    fun clearError() {
+        _errorMessage.value = null
+    }
+
     suspend fun clearFields() {
         userSessionRepository.setServerUrl("");
         _username.value = ""
@@ -49,8 +55,13 @@ class LoginViewModel @Inject constructor(
     }
 
     suspend fun login(): Boolean {
+        _errorMessage.value = null
         userSessionRepository.setServerUrl(url.value)
-        return jellyfinApiClient.login(url.value, username.value, password.value)
+        val success = jellyfinApiClient.login(url.value, username.value, password.value)
+        if (!success) {
+            _errorMessage.value = "Login failed. Check your server URL, username, and password."
+        }
+        return success
     }
 
 }