Use snack status for non-blocking wallet operations

lib/app.dart

@@ -42,6 +42,8 @@ class _PeyaAppState extends ConsumerState<PeyaApp> with WindowListener {
       GlobalKey<ScaffoldMessengerState>();
   final GlobalKey<NavigatorState> _navigatorKey = GlobalKey<NavigatorState>();
   String? _lastErrorMessage;
+  String? _lastStatusMessage;
+  bool _statusSnackVisible = false;
   bool _desktopCloseHookInitialized = false;
   bool _handlingWindowClose = false;
 
@@ -70,6 +72,7 @@ class _PeyaAppState extends ConsumerState<PeyaApp> with WindowListener {
     });
     _walletSubscription = ref
         .listenManual<WalletState>(walletControllerProvider, (previous, next) {
+      _handleOperationStatusChange(previous, next);
       if (previous?.walletInfo == null && next.walletInfo != null) {
         final config = ref.read(appConfigControllerProvider);
         _connectNodeIfPossible(config);
@@ -86,6 +89,40 @@ class _PeyaAppState extends ConsumerState<PeyaApp> with WindowListener {
     });
   }
 
+  void _handleOperationStatusChange(WalletState? previous, WalletState next) {
+    final messenger = _scaffoldMessengerKey.currentState;
+    if (messenger == null) {
+      return;
+    }
+    final shouldShowStatus = next.isLoading &&
+        !next.isBlockingOperation &&
+        next.operationMessage != null &&
+        next.operationMessage!.isNotEmpty;
+
+    if (shouldShowStatus) {
+      final message = next.operationMessage!;
+      if (_statusSnackVisible && _lastStatusMessage == message) {
+        return;
+      }
+      messenger.hideCurrentSnackBar();
+      messenger.showSnackBar(
+        SnackBar(
+          content: Text(message),
+          duration: const Duration(days: 1),
+        ),
+      );
+      _statusSnackVisible = true;
+      _lastStatusMessage = message;
+      return;
+    }
+
+    if (_statusSnackVisible) {
+      messenger.hideCurrentSnackBar();
+      _statusSnackVisible = false;
+      _lastStatusMessage = null;
+    }
+  }
+
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
@@ -653,7 +690,7 @@ class _RootRouter extends ConsumerWidget {
     return Stack(
       children: [
         child,
-        if (state.isLoading)
+        if (state.isLoading && state.isBlockingOperation)
           Positioned.fill(
             child: ColoredBox(
               color: const Color(0x66000000),
@@ -670,9 +707,10 @@ class _RootRouter extends ConsumerWidget {
                         const CircularProgressIndicator(),
                         const SizedBox(height: 16),
                         Text(
-                          AppLocalizations.of(context)
-                                  ?.walletOperationInProgress ??
-                              'Working...',
+                          state.operationMessage ??
+                              AppLocalizations.of(context)
+                                      ?.walletOperationInProgress ??
+                                  'Working...',
                         ),
                       ],
                     ),

lib/state/wallet_controller.dart

@@ -13,6 +13,8 @@ import '../domain/transactions.dart';
 import '../services/wallet_cache_recovery.dart';
 
 class WalletState {
+  static const Object _sentinel = Object();
+
   const WalletState({
     required this.walletInfo,
     required this.balanceAtomic,
@@ -21,6 +23,8 @@ class WalletState {
     required this.subaddresses,
     required this.syncStatus,
     required this.isLoading,
+    required this.isBlockingOperation,
+    required this.operationMessage,
     required this.isSyncing,
     required this.error,
   });
@@ -32,6 +36,8 @@ class WalletState {
   final List<SubaddressInfo> subaddresses;
   final SyncStatus syncStatus;
   final bool isLoading;
+  final bool isBlockingOperation;
+  final String? operationMessage;
   final bool isSyncing;
   final String? error;
 
@@ -43,6 +49,8 @@ class WalletState {
     List<SubaddressInfo>? subaddresses,
     SyncStatus? syncStatus,
     bool? isLoading,
+    bool? isBlockingOperation,
+    Object? operationMessage = _sentinel,
     bool? isSyncing,
     String? error,
   }) {
@@ -54,6 +62,10 @@ class WalletState {
       subaddresses: subaddresses ?? this.subaddresses,
       syncStatus: syncStatus ?? this.syncStatus,
       isLoading: isLoading ?? this.isLoading,
+      isBlockingOperation: isBlockingOperation ?? this.isBlockingOperation,
+      operationMessage: identical(operationMessage, _sentinel)
+          ? this.operationMessage
+          : operationMessage as String?,
       isSyncing: isSyncing ?? this.isSyncing,
       error: error,
     );
@@ -68,6 +80,8 @@ class WalletState {
       subaddresses: const [],
       syncStatus: SyncStatus.initial(),
       isLoading: false,
+      isBlockingOperation: false,
+      operationMessage: null,
       isSyncing: false,
       error: null,
     );
@@ -129,7 +143,7 @@ class WalletController extends StateNotifier<WalletState> {
       } finally {
         await _cacheRecovery.clearOpenAttempt();
       }
-    });
+    }, message: 'Creating wallet...');
   }
 
   Future<String> prepareWalletSeedDraft({
@@ -155,7 +169,7 @@ class WalletController extends StateNotifier<WalletState> {
           await tempDir.delete(recursive: true);
         }
       }
-    });
+    }, message: 'Preparing seed backup...');
   }
 
   Future<void> restoreWalletFromSeed({
@@ -179,7 +193,7 @@ class WalletController extends StateNotifier<WalletState> {
       } finally {
         await _cacheRecovery.clearOpenAttempt();
       }
-    });
+    }, message: 'Restoring wallet...');
   }
 
   Future<void> openWallet({
@@ -196,7 +210,7 @@ class WalletController extends StateNotifier<WalletState> {
       } finally {
         await _cacheRecovery.clearOpenAttempt();
       }
-    });
+    }, message: 'Opening wallet...');
   }
 
   Future<bool> verifyWalletPassword({
@@ -217,7 +231,7 @@ class WalletController extends StateNotifier<WalletState> {
   Future<void> connectNode(NodeConfig nodeConfig) async {
     await _runWithLoading(() async {
       await _repository.connectNode(nodeConfig);
-    });
+    }, blocking: false, message: 'Connecting to node...');
   }
 
   Future<void> switchWallet() async {
@@ -237,7 +251,11 @@ class WalletController extends StateNotifier<WalletState> {
     if (state.walletInfo == null) {
       throw StateError('No wallet loaded');
     }
-    return _runWithLoading(() => _repository.createSubaddress(label: label));
+    return _runWithLoading(
+      () => _repository.createSubaddress(label: label),
+      blocking: false,
+      message: 'Creating subaddress...',
+    );
   }
 
   Future<void> setSubaddressLabel({
@@ -254,7 +272,7 @@ class WalletController extends StateNotifier<WalletState> {
         addressIndex: addressIndex,
         label: label,
       );
-    });
+    }, blocking: false, message: 'Updating subaddress...');
     await refreshSubaddresses();
   }
 
@@ -270,7 +288,11 @@ class WalletController extends StateNotifier<WalletState> {
     if (state.walletInfo == null) {
       throw StateError('No wallet loaded');
     }
-    return _runWithLoading(() => _repository.prepareSend(request));
+    return _runWithLoading(
+      () => _repository.prepareSend(request),
+      blocking: false,
+      message: 'Preparing transaction...',
+    );
   }
 
   Future<SendResult> commitPreparedSend() async {
@@ -281,7 +303,7 @@ class WalletController extends StateNotifier<WalletState> {
       final result = await _repository.commitPreparedSend();
       await _refreshSnapshot();
       return result;
-    });
+    }, blocking: false, message: 'Submitting transaction...');
   }
 
   Future<void> discardPreparedSend() async {
@@ -300,7 +322,7 @@ class WalletController extends StateNotifier<WalletState> {
         amountAtomic: amountAtomic,
         accountIndex: accountIndex,
       );
-    });
+    }, blocking: false, message: 'Preparing stake...');
   }
 
   Future<Map<String, StakeYieldInfo>> getActiveStakeYields({
@@ -324,7 +346,7 @@ class WalletController extends StateNotifier<WalletState> {
       final result = await _repository.commitPreparedStake();
       await _refreshSnapshot();
       return result;
-    });
+    }, blocking: false, message: 'Submitting stake...');
   }
 
   Future<void> discardPreparedStake() async {
@@ -384,6 +406,7 @@ class WalletController extends StateNotifier<WalletState> {
       syncStatus: SyncStatus.initial(),
       transactions: const [],
       subaddresses: subaddresses,
+      operationMessage: null,
       error: null,
     );
   }
@@ -414,8 +437,17 @@ class WalletController extends StateNotifier<WalletState> {
     return snapshot;
   }
 
-  Future<T> _runWithLoading<T>(Future<T> Function() action) async {
-    state = state.copyWith(isLoading: true, error: null);
+  Future<T> _runWithLoading<T>(
+    Future<T> Function() action, {
+    bool blocking = true,
+    String? message,
+  }) async {
+    state = state.copyWith(
+      isLoading: true,
+      isBlockingOperation: blocking,
+      operationMessage: message,
+      error: null,
+    );
     try {
       await SchedulerBinding.instance.endOfFrame;
       return await action();
@@ -424,7 +456,11 @@ class WalletController extends StateNotifier<WalletState> {
       state = state.copyWith(error: error.toString());
       rethrow;
     } finally {
-      state = state.copyWith(isLoading: false);
+      state = state.copyWith(
+        isLoading: false,
+        isBlockingOperation: false,
+        operationMessage: null,
+      );
     }
   }