fix: show AI limit error toast if exceeding the AI response (#6505)

* fix: show AI limit error toast if exceeding the AI response

* test: add ai limit test

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/openai/widgets/smart_edit_bloc.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/service/ai_client.dart';
+import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/service/error.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/widgets/smart_edit_action.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/plugins.dart';
 import 'package:appflowy/user/application/ai_service.dart';
@@ -45,11 +46,12 @@ class SmartEditBloc extends Bloc<SmartEditEvent, SmartEditState> {
           isCanceled = true;
           await _exit();
         },
-        update: (result, isLoading) async {
+        update: (result, isLoading, aiError) async {
           emit(
             state.copyWith(
               result: result,
               loading: isLoading,
+              requestError: aiError,
             ),
           );
         },
@@ -73,7 +75,7 @@ class SmartEditBloc extends Bloc<SmartEditEvent, SmartEditState> {
     await aiRepositoryCompleter.future;
 
     if (rewrite) {
-      add(const SmartEditEvent.update('', true));
+      add(const SmartEditEvent.update('', true, null));
     }
 
     if (enableLogging) {
@@ -91,7 +93,7 @@ class SmartEditBloc extends Bloc<SmartEditEvent, SmartEditState> {
         if (enableLogging) {
           Log.info('[smart_edit] start generating');
         }
-        add(const SmartEditEvent.update('', true));
+        add(const SmartEditEvent.update('', true, null));
       },
       onProcess: (text) async {
         if (isCanceled) {
@@ -102,7 +104,7 @@ class SmartEditBloc extends Bloc<SmartEditEvent, SmartEditState> {
           Log.debug('[smart_edit] onProcess: $text');
         }
         final newResult = state.result + text;
-        add(SmartEditEvent.update(newResult, false));
+        add(SmartEditEvent.update(newResult, false, null));
       },
       onEnd: () async {
         if (isCanceled) {
@@ -111,7 +113,7 @@ class SmartEditBloc extends Bloc<SmartEditEvent, SmartEditState> {
         if (enableLogging) {
           Log.info('[smart_edit] end generating');
         }
-        add(SmartEditEvent.update('${state.result}\n', false));
+        add(SmartEditEvent.update('${state.result}\n', false, null));
       },
       onError: (error) async {
         if (isCanceled) {
@@ -120,7 +122,9 @@ class SmartEditBloc extends Bloc<SmartEditEvent, SmartEditState> {
         if (enableLogging) {
           Log.info('[smart_edit] onError: $error');
         }
+        add(SmartEditEvent.update('', false, error));
         await _exit();
+        await _clearSelection();
       },
     );
   }
@@ -207,6 +211,14 @@ class SmartEditBloc extends Bloc<SmartEditEvent, SmartEditState> {
       ),
     );
   }
+
+  Future<void> _clearSelection() async {
+    final selection = editorState.selection;
+    if (selection == null) {
+      return;
+    }
+    editorState.selection = null;
+  }
 }
 
 @freezed
@@ -219,7 +231,11 @@ class SmartEditEvent with _$SmartEditEvent {
   const factory SmartEditEvent.replace() = _Replace;
   const factory SmartEditEvent.insertBelow() = _InsertBelow;
   const factory SmartEditEvent.cancel() = _Cancel;
-  const factory SmartEditEvent.update(String result, bool isLoading) = _Update;
+  const factory SmartEditEvent.update(
+    String result,
+    bool isLoading,
+    AIError? error,
+  ) = _Update;
 }
 
 @freezed
@@ -228,6 +244,7 @@ class SmartEditState with _$SmartEditState {
     required bool loading,
     required String result,
     required SmartEditAction action,
+    @Default(null) AIError? requestError,
   }) = _SmartEditState;
 
   factory SmartEditState.initial(SmartEditAction action) => SmartEditState(

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/openai/widgets/smart_edit_node_widget.dart

@@ -2,6 +2,8 @@ import 'dart:async';
 
 import 'package:appflowy/generated/locale_keys.g.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/service/ai_client.dart';
+import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/service/error.dart';
+import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/widgets/ai_limit_dialog.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/widgets/smart_edit_action.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/openai/widgets/smart_edit_bloc.dart';
 import 'package:appflowy/startup/startup.dart';
@@ -12,6 +14,7 @@ import 'package:easy_localization/easy_localization.dart';
 import 'package:flowy_infra_ui/flowy_infra_ui.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:toastification/toastification.dart';
 
 class SmartEditBlockKeys {
   const SmartEditBlockKeys._();
@@ -123,6 +126,8 @@ class _SmartEditBlockComponentWidgetState
 
     return BlocProvider.value(
       value: smartEditBloc,
+      child: BlocListener<SmartEditBloc, SmartEditState>(
+        listener: _onListen,
         child: AppFlowyPopover(
           controller: popoverController,
           direction: PopoverDirection.bottomWithLeftAligned,
@@ -160,6 +165,7 @@ class _SmartEditBlockComponentWidgetState
             width: double.infinity,
           ),
         ),
+      ),
     );
   }
 
@@ -179,6 +185,21 @@ class _SmartEditBlockComponentWidgetState
     final transaction = editorState.transaction..deleteNode(widget.node);
     editorState.apply(transaction);
   }
+
+  void _onListen(BuildContext context, SmartEditState state) {
+    final error = state.requestError;
+    if (error != null) {
+      if (error.isLimitExceeded) {
+        showAILimitDialog(context, error.message);
+      } else {
+        showToastNotification(
+          context,
+          message: error.message,
+          type: ToastificationType.error,
+        );
+      }
+    }
+  }
 }
 
 class SmartEditInputContent extends StatelessWidget {

frontend/appflowy_flutter/test/bloc_test/smart_edit_test/smart_editor_bloc_test.dart

@@ -9,7 +9,7 @@ import 'package:bloc_test/bloc_test.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mocktail/mocktail.dart';
 
-class MockAIRepository extends Mock implements AIRepository {
+class _MockAIRepository extends Mock implements AIRepository {
   @override
   Future<void> streamCompletion({
     required String text,
@@ -28,6 +28,26 @@ class MockAIRepository extends Mock implements AIRepository {
   }
 }
 
+class _MockErrorRepository extends Mock implements AIRepository {
+  @override
+  Future<void> streamCompletion({
+    required String text,
+    required CompletionTypePB completionType,
+    required Future<void> Function() onStart,
+    required Future<void> Function(String text) onProcess,
+    required Future<void> Function() onEnd,
+    required void Function(AIError error) onError,
+  }) async {
+    await onStart();
+    onError(
+      const AIError(
+        message: 'Error',
+        code: AIErrorCode.aiResponseLimitExceeded,
+      ),
+    );
+  }
+}
+
 void main() {
   group('SmartEditorBloc: ', () {
     blocTest<SmartEditBloc, SmartEditState>(
@@ -64,7 +84,7 @@ void main() {
         );
       },
       act: (bloc) {
-        bloc.add(SmartEditEvent.initial(Future.value(MockAIRepository())));
+        bloc.add(SmartEditEvent.initial(Future.value(_MockAIRepository())));
         bloc.add(const SmartEditEvent.rewrite());
       },
       expect: () => [
@@ -78,17 +98,56 @@ void main() {
         isA<SmartEditState>().having((s) => s.loading, 'loading', false),
       ],
     );
+
+    blocTest<SmartEditBloc, SmartEditState>(
+      'exceed the ai response limit',
+      build: () {
+        const text1 = '1. Select text to style using the toolbar menu.';
+        const text2 = '2. Discover more styling options in Aa.';
+        const text3 =
+            '3. AppFlowy empowers you to beautifully and effortlessly style your content.';
+        final document = Document(
+          root: pageNode(
+            children: [
+              paragraphNode(text: text1),
+              paragraphNode(text: text2),
+              paragraphNode(text: text3),
+            ],
+          ),
+        );
+        final editorState = EditorState(document: document);
+        editorState.selection = Selection(
+          start: Position(path: [0]),
+          end: Position(path: [2], offset: text3.length),
+        );
+
+        final node = smartEditNode(
+          action: SmartEditAction.makeItLonger,
+          content: [text1, text2, text3].join('\n'),
+        );
+        return SmartEditBloc(
+          node: node,
+          editorState: editorState,
+          action: SmartEditAction.makeItLonger,
+          enableLogging: false,
+        );
+      },
+      act: (bloc) {
+        bloc.add(SmartEditEvent.initial(Future.value(_MockErrorRepository())));
+        bloc.add(const SmartEditEvent.rewrite());
+      },
+      expect: () => [
+        isA<SmartEditState>()
+            .having((s) => s.loading, 'loading', true)
+            .having((s) => s.result, 'result', isEmpty),
+        isA<SmartEditState>()
+            .having((s) => s.requestError, 'requestError', isNotNull)
+            .having(
+              (s) => s.requestError?.code,
+              'requestError.code',
+              AIErrorCode.aiResponseLimitExceeded,
+            ),
+      ],
+    );
   });
 }
-
-
-// [
-//             _$SmartEditStateImpl:SmartEditState(loading: true, result: , action: SmartEditAction.makeItLonger),
-//             _$SmartEditStateImpl:SmartEditState(loading: false, result: UPDATED: 1. Select text to style using the toolbar menu.
-//           2. Discover more styling options in Aa.
-//           3. AppFlowy empowers you to beautifully and effortlessly style your content.
-
-//           , action: SmartEditAction.makeItLonger),
-//             _$SmartEditStateImpl:SmartEditState(loading: false, result:
-//           , action: SmartEditAction.makeItLonger)
-//           ]