feature: add rename chat history feature (#129)

Co-authored-by: lyan608 <lyan608@aucklanduni.ac.nz>

Author: Ida631

lib/presentation/chat/viewModels/chat_view_model.dart

@@ -140,6 +140,21 @@ class ChatViewModel extends ChangeNotifier {
     }
   }
 
+  Future<void> updateChatTitle(Chat chat, String newTitle) async {
+    try {
+      final updated = await _chatUseCase.updateChatTitle(chat, newTitle);
+      final index = chats.indexWhere((c) => c.id == chat.id);
+      if (index >= 0) {
+        chats[index].title = updated.title;
+      }
+      notifyListeners();
+    } catch (e) {
+      if (kDebugMode) print('Update error: $e');
+      errorMessage = 'Failed to rename chat. Please try again.';
+      notifyListeners();
+    }
+  }
+
   Future<void> checkAuthStatus() async {
     isLoggedIn = await _authUseCase.isLoggedIn();
     print("isLoggedIn: $isLoggedIn");

lib/presentation/chat/views/chat_list.dart

@@ -2,6 +2,36 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../viewModels/chat_view_model.dart';
 
+/// Returns the new title if user confirms, null if cancelled.
+Future<String?> showRenameDialog(BuildContext context, String currentTitle) async {
+  final controller = TextEditingController(text: currentTitle);
+  return showDialog<String>(
+    context: context,
+    builder: (context) => AlertDialog(
+      title: const Text('Rename chat'),
+      content: TextField(
+        controller: controller,
+        decoration: const InputDecoration(
+          labelText: 'Title',
+          border: OutlineInputBorder(),
+        ),
+        autofocus: true,
+        onSubmitted: (_) => Navigator.of(context).pop(controller.text.trim()),
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: const Text('Cancel'),
+        ),
+        ElevatedButton(
+          onPressed: () => Navigator.of(context).pop(controller.text.trim()),
+          child: const Text('Save'),
+        ),
+      ],
+    ),
+  );
+}
+
 class ChatList extends StatelessWidget {
   const ChatList({Key? key}) : super(key: key);
 
@@ -46,16 +76,50 @@ class ChatList extends StatelessWidget {
               contentPadding: EdgeInsets.only(left: 16, right: 8),
               trailing: PopupMenuButton<String>(
                 padding: EdgeInsets.zero,
-                onSelected: (value) {
+                onSelected: (value) async {
                   switch (value) {
-                    case 'delete': chatViewModel.deleteChat(chat);
-                    break;
+                    case 'delete':
+                      chatViewModel.deleteChat(chat);
+                      break;
+                    case 'rename':
+                      final newTitle = await showRenameDialog(context, chat.title);
+                      if (newTitle != null && newTitle.isNotEmpty) {
+                        await chatViewModel.updateChatTitle(chat, newTitle);
+                      }
+                      break;
                   }
                 },
                 itemBuilder: (context) => [
-                  PopupMenuItem(value: 'pin', child: Text('Pin')),
-                  PopupMenuItem(value: 'rename', child: Text('Rename')),
-                  PopupMenuItem(value: 'delete', child: Text('Delete')),
+                  PopupMenuItem(
+                    value: 'pin',
+                    child: Row(
+                      children: const [
+                        Icon(Icons.push_pin, size: 20),
+                        SizedBox(width: 8),
+                        Text('Pin'),
+                      ],
+                    ),
+                  ),
+                  PopupMenuItem(
+                    value: 'rename',
+                    child: Row(
+                      children: const [
+                        Icon(Icons.edit, size: 20),
+                        SizedBox(width: 8),
+                        Text('Rename'),
+                      ],
+                    ),
+                  ),
+                  PopupMenuItem(
+                    value: 'delete',
+                    child: Row(
+                      children: const [
+                        Icon(Icons.delete, size: 20),
+                        SizedBox(width: 8),
+                        Text('Delete'),
+                      ],
+                    ),
+                  ),
                 ],
               ),
               title: Text(

packages/data/lib/chat/chat_repository_imp.dart

@@ -70,4 +70,22 @@ class ChatRepositoryImpl implements ChatRepository {
       throw mapServerErrorToDomainException(response);
     }
   }
+
+  @override
+  Future<Chat> updateChatTitle(Chat chat, String newTitle) async {
+    final baseURL = await apiEnvironment.getBaseUrl();
+    final url = Uri.parse('$baseURL/chats/${chat.id}');
+    final response = await authClient.post(
+      url,
+      headers: {'Content-Type': 'application/json'},
+      body: jsonEncode({'chat': {'title': newTitle}}),
+    );
+    if (response.statusCode == 200 || response.statusCode == 204) {
+      final decoded = utf8.decode(response.bodyBytes);
+      final data = jsonDecode(decoded) as Map<String, dynamic>;
+      return Chat.fromJson(data);
+    } else {
+      throw mapServerErrorToDomainException(response);
+    }
+  }
 }

packages/domain/lib/chat/chat_repository.dart

@@ -5,4 +5,5 @@ abstract class ChatRepository {
   Future<List<Chat>> fetchChats();  // Fetch sessions from a data source
   Future<List<Message>> fetchMessages(Chat chat);
   Future<void> deleteChat(Chat chat);
+  Future<Chat> updateChatTitle(Chat chat, String newTitle);
 }

packages/domain/lib/chat/chat_use_case.dart

@@ -7,6 +7,8 @@ abstract class ChatUseCase {
   Future<List<Message>> fetchMessages(Chat chat);
 
   Future<void> deleteChat(Chat chat);
+
+  Future<Chat> updateChatTitle(Chat chat, String newTitle);
 }
 
 
@@ -27,4 +29,7 @@ class ChatUseCaseImpl implements ChatUseCase {
   Future<void> deleteChat(Chat chat) async {
     return repository.deleteChat(chat);
   }
+  Future<Chat> updateChatTitle(Chat chat, String newTitle) async {
+    return repository.updateChatTitle(chat, newTitle);
+  }
 }