Fix and UI refactor for app configuration feature

lib/app/view/app.dart

@@ -7,6 +7,7 @@ import 'package:go_router/go_router.dart';
 import 'package:ht_auth_repository/ht_auth_repository.dart';
 import 'package:ht_dashboard/app/bloc/app_bloc.dart';
 import 'package:ht_dashboard/app/config/app_environment.dart';
+import 'package:ht_dashboard/app_configuration/bloc/app_configuration_bloc.dart';
 import 'package:ht_dashboard/authentication/bloc/authentication_bloc.dart';
 import 'package:ht_dashboard/l10n/app_localizations.dart';
 import 'package:ht_dashboard/router/router.dart';
@@ -81,6 +82,11 @@ class App extends StatelessWidget {
               authenticationRepository: context.read<HtAuthRepository>(),
             ),
           ),
+          BlocProvider(
+            create: (context) => AppConfigurationBloc(
+              appConfigRepository: context.read<HtDataRepository<AppConfig>>(),
+            ),
+          ),
         ],
         child: _AppView(
           htAuthenticationRepository: _htAuthenticationRepository,

lib/app_configuration/bloc/app_configuration_bloc.dart

@@ -11,10 +11,13 @@ class AppConfigurationBloc
   AppConfigurationBloc({
     required HtDataRepository<AppConfig> appConfigRepository,
   }) : _appConfigRepository = appConfigRepository,
-       super(const AppConfigurationState()) {
+       super(
+         const AppConfigurationState(),
+       ) {
     on<AppConfigurationLoaded>(_onAppConfigurationLoaded);
     on<AppConfigurationUpdated>(_onAppConfigurationUpdated);
     on<AppConfigurationFieldChanged>(_onAppConfigurationFieldChanged);
+    on<AppConfigurationDiscarded>(_onAppConfigurationDiscarded);
   }
 
   final HtDataRepository<AppConfig> _appConfigRepository;
@@ -30,7 +33,10 @@ class AppConfigurationBloc
         state.copyWith(
           status: AppConfigurationStatus.success,
           appConfig: appConfig,
+          originalAppConfig: appConfig, // Store the original config
           isDirty: false,
+          clearShowSaveSuccess:
+              true, // Clear any previous success snackbar flag
         ),
       );
     } on HtHttpException catch (e) {
@@ -64,7 +70,9 @@ class AppConfigurationBloc
         state.copyWith(
           status: AppConfigurationStatus.success,
           appConfig: updatedConfig,
+          originalAppConfig: updatedConfig, // Update original config on save
           isDirty: false,
+          showSaveSuccess: true, // Set flag to show success snackbar
         ),
       );
     } on HtHttpException catch (e) {
@@ -93,6 +101,21 @@ class AppConfigurationBloc
         appConfig: event.appConfig,
         isDirty: true,
         clearErrorMessage: true, // Clear any previous error messages
+        clearShowSaveSuccess: true, // Clear success snackbar on field change
+      ),
+    );
+  }
+
+  void _onAppConfigurationDiscarded(
+    AppConfigurationDiscarded event,
+    Emitter<AppConfigurationState> emit,
+  ) {
+    emit(
+      state.copyWith(
+        appConfig: state.originalAppConfig, // Revert to original config
+        isDirty: false,
+        clearErrorMessage: true, // Clear any previous error messages
+        clearShowSaveSuccess: true, // Clear success snackbar
       ),
     );
   }

lib/app_configuration/bloc/app_configuration_event.dart

@@ -33,6 +33,14 @@ class AppConfigurationUpdated extends AppConfigurationEvent {
   List<Object?> get props => [appConfig];
 }
 
+/// {@template app_configuration_discarded}
+/// Event to discard any unsaved changes to the application configuration.
+/// {@endtemplate}
+class AppConfigurationDiscarded extends AppConfigurationEvent {
+  /// {@macro app_configuration_discarded}
+  const AppConfigurationDiscarded();
+}
+
 /// {@template app_configuration_field_changed}
 /// Event to notify that a field in the application configuration has changed.
 ///

lib/app_configuration/bloc/app_configuration_state.dart

@@ -23,8 +23,10 @@ class AppConfigurationState extends Equatable {
   const AppConfigurationState({
     this.status = AppConfigurationStatus.initial,
     this.appConfig,
+    this.originalAppConfig,
     this.errorMessage,
     this.isDirty = false,
+    this.showSaveSuccess = false,
   });
 
   /// The current status of the application configuration.
@@ -33,35 +35,50 @@ class AppConfigurationState extends Equatable {
   /// The loaded or updated application configuration.
   final AppConfig? appConfig;
 
+  /// The original application configuration loaded from the backend.
+  final AppConfig? originalAppConfig;
+
   /// An error message if an operation failed.
   final String? errorMessage;
 
   /// Indicates if there are unsaved changes to the configuration.
   final bool isDirty;
 
+  /// Indicates if a save operation was successful and a snackbar should be shown.
+  final bool showSaveSuccess;
+
   /// Creates a copy of the current state with updated values.
   AppConfigurationState copyWith({
     AppConfigurationStatus? status,
     AppConfig? appConfig,
+    AppConfig? originalAppConfig,
     String? errorMessage,
     bool? isDirty,
     bool clearErrorMessage = false,
+    bool? showSaveSuccess,
+    bool clearShowSaveSuccess = false,
   }) {
     return AppConfigurationState(
       status: status ?? this.status,
       appConfig: appConfig ?? this.appConfig,
+      originalAppConfig: originalAppConfig ?? this.originalAppConfig,
       errorMessage: clearErrorMessage
           ? null
           : errorMessage ?? this.errorMessage,
       isDirty: isDirty ?? this.isDirty,
+      showSaveSuccess: clearShowSaveSuccess
+          ? false
+          : showSaveSuccess ?? this.showSaveSuccess,
     );
   }
 
   @override
   List<Object?> get props => [
     status,
     appConfig,
+    originalAppConfig,
     errorMessage,
     isDirty,
+    showSaveSuccess,
   ];
 }