android/app/src/main/kotlin/com/flagship/abox/manager/ui/login/LoginScreen.kt

@@ -80,7 +80,8 @@ fun LoginScreen(
     onSwitchProvider: () -> Unit,
     switchingProvider: Boolean = false,
 ) {
-    val navigationEnabled = !state.isSubmitting && !switchingProvider
+    val formEnabled = !state.isSubmitting && !state.isLoadingPreferences
+    val navigationEnabled = formEnabled && !switchingProvider
     BackHandler {
         if (navigationEnabled) onSwitchProvider()
     }
@@ -140,7 +141,7 @@ fun LoginScreen(
                     value = state.username,
                     onValueChange = onUsernameChange,
                     label = { Text(stringResource(R.string.login_username)) },
-                    enabled = !state.isSubmitting,
+                    enabled = formEnabled,
                     singleLine = true,
                     modifier = Modifier.fillMaxWidth(),
                 )
@@ -149,29 +150,31 @@ fun LoginScreen(
                     onValueChange = onPasswordChange,
                     label = { Text(stringResource(R.string.login_password)) },
                     visualTransformation = PasswordVisualTransformation(),
-                    enabled = !state.isSubmitting,
+                    enabled = formEnabled,
                     singleLine = true,
                     modifier = Modifier.fillMaxWidth(),
                 )
                 ToggleRow(
                     label = stringResource(R.string.login_remember_username),
                     checked = state.rememberUsername,
-                    enabled = !state.isSubmitting,
+                    enabled = formEnabled,
                     onCheckedChange = onRememberUsernameChange,
                 )
                 ToggleRow(
                     label = stringResource(R.string.login_auto_login),
                     checked = state.autoLogin,
-                    enabled = !state.isSubmitting,
+                    enabled = formEnabled,
                     onCheckedChange = onAutoLoginChange,
                 )
                 state.errorMessage?.let { Text(it, color = MaterialTheme.colorScheme.error) }
                 ABoxButton(
                     onClick = onSubmit,
-                    enabled = !state.isSubmitting && !switchingProvider,
+                    enabled = formEnabled && !switchingProvider,
                     modifier = Modifier.fillMaxWidth(),
                 ) {
-                    if (state.isSubmitting || switchingProvider) ABoxLoadingIndicator()
+                    if (state.isSubmitting || state.isLoadingPreferences || switchingProvider) {
+                        ABoxLoadingIndicator()
+                    }
                     else Text(stringResource(R.string.action_login))
                 }
                 ABoxButton(

android/app/src/main/kotlin/com/flagship/abox/manager/ui/login/LoginViewModel.kt

@@ -27,20 +27,39 @@ class LoginViewModel @Inject constructor(
     val uiState: StateFlow<LoginUiState> = _uiState.asStateFlow()
     private var profile: ProviderProfile? = null
     private var loadingJob: Job? = null
+    private var usernameEdited = false
+    private var rememberUsernameEdited = false
+    private var autoLoginEdited = false
 
     fun loadProfile(value: ProviderProfile) {
         val profileChanged = profile?.id != value.id
         if (!profileChanged && loadingJob != null) return
         loadingJob?.cancel()
         profile = value
-        _uiState.value = LoginUiState()
+        usernameEdited = false
+        rememberUsernameEdited = false
+        autoLoginEdited = false
+        _uiState.value = LoginUiState(isLoadingPreferences = true)
         loadingJob = viewModelScope.launch {
             val preferences = profileStore.loginPreferences(value.id)
             if (profile?.id != value.id) return@launch
-            _uiState.value = LoginUiState(
-                username = preferences.rememberedUsername?.value.orEmpty(),
-                rememberUsername = preferences.rememberUsername,
-                autoLogin = preferences.autoLoginEnabled,
+            _uiState.value = _uiState.value.copy(
+                username = if (usernameEdited) {
+                    _uiState.value.username
+                } else {
+                    preferences.rememberedUsername?.value.orEmpty()
+                },
+                rememberUsername = if (rememberUsernameEdited) {
+                    _uiState.value.rememberUsername
+                } else {
+                    preferences.rememberUsername
+                },
+                autoLogin = if (autoLoginEdited) {
+                    _uiState.value.autoLogin
+                } else {
+                    preferences.autoLoginEnabled
+                },
+                isLoadingPreferences = false,
             )
         }
     }
@@ -49,10 +68,14 @@ class LoginViewModel @Inject constructor(
         loadingJob?.cancel()
         loadingJob = null
         profile = null
+        usernameEdited = false
+        rememberUsernameEdited = false
+        autoLoginEdited = false
         _uiState.value = LoginUiState()
     }
 
     fun setUsername(value: String) {
+        usernameEdited = true
         _uiState.value = _uiState.value.copy(username = value, errorMessage = null)
     }
 
@@ -61,17 +84,23 @@ class LoginViewModel @Inject constructor(
     }
 
     fun setRememberUsername(value: Boolean) {
+        rememberUsernameEdited = true
         _uiState.value = _uiState.value.copy(rememberUsername = value)
     }
 
     fun setAutoLogin(value: Boolean) {
+        autoLoginEdited = true
         _uiState.value = _uiState.value.copy(autoLogin = value)
     }
 
     fun submit() {
         val activeProfile = profile ?: return
         val state = _uiState.value
-        if (state.username.isBlank() || state.password.isEmpty() || state.isSubmitting) {
+        if (state.username.isBlank() ||
+            state.password.isEmpty() ||
+            state.isSubmitting ||
+            state.isLoadingPreferences
+        ) {
             _uiState.value = state.copy(errorMessage = "Username and password are required")
             return
         }
@@ -104,6 +133,7 @@ data class LoginUiState(
     val password: String = "",
     val rememberUsername: Boolean = false,
     val autoLogin: Boolean = false,
+    val isLoadingPreferences: Boolean = false,
     val isSubmitting: Boolean = false,
     val errorMessage: String? = null,
 )

android/core/session/src/main/kotlin/com/flagship/abox/manager/session/credential/KeystoreCredentialStore.kt

@@ -44,8 +44,16 @@ class KeystoreCredentialStore(
             DomainResult.Success(decode(cipher.decrypt(profileId, encrypted)))
         } catch (error: Exception) {
             if (error.isPermanentCredentialFailure()) {
+                try {
                     dataStore.edit { it.remove(credentialKey(profileId)) }
                     DomainResult.Success(null)
+                } catch (cleanupError: Exception) {
+                    DomainResult.Failure(
+                        DomainError.Unknown(
+                            detail = cleanupError.message ?: cleanupError::class.java.simpleName,
+                        ),
+                    )
+                }
             } else {
                 DomainResult.Failure(
                     DomainError.Unknown(detail = error.message ?: error::class.java.simpleName),

android/core/session/src/test/kotlin/com/flagship/abox/manager/session/CredentialCleanupFailureTest.kt

@@ -0,0 +1,43 @@
+package com.flagship.abox.manager.session
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import com.flagship.abox.manager.domain.DomainResult
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.session.credential.CredentialCipher
+import com.flagship.abox.manager.session.credential.KeystoreCredentialStore
+import java.io.IOException
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class CredentialCleanupFailureTest {
+    @Test
+    fun cleanupFailureReturnsDomainFailureInsteadOfThrowing() = runTest {
+        val store = KeystoreCredentialStore(FailingCleanupDataStore(), UnusedCipher())
+
+        val result = store.loadCredentials(ProviderProfileId("profile"))
+
+        assertTrue(result is DomainResult.Failure)
+        assertEquals("disk unavailable", (result as DomainResult.Failure).error.detail)
+    }
+
+    private class FailingCleanupDataStore : DataStore<Preferences> {
+        override val data: Flow<Preferences> = flow {
+            throw IllegalArgumentException("corrupt credential")
+        }
+
+        override suspend fun updateData(
+            transform: suspend (t: Preferences) -> Preferences,
+        ): Preferences = throw IOException("disk unavailable")
+    }
+
+    private class UnusedCipher : CredentialCipher {
+        override fun encrypt(profileId: ProviderProfileId, plaintext: ByteArray): ByteArray = plaintext
+
+        override fun decrypt(profileId: ProviderProfileId, encrypted: ByteArray): ByteArray = encrypted
+    }
+}