add logic for stream

lib/network/search_service.dart

@@ -17,6 +17,8 @@ const String startPersonalWishlistMutations = r'''
   }
 ''';
 
+SearchEventType type = SearchEventType.message;
+
 class SearchService {
   final AuthenticationService _authenticationService = AuthenticationService();
   final ApiClient client = ApiClient();
@@ -29,9 +31,17 @@ class SearchService {
     await _authenticationService.initialize();
   }
 
+  bool checkerForProduct() {
+    return type == SearchEventType.product;
+  }
+
+  String? wishlistId;
+
   Future<void> startPersonalWishlist(String message) async {
     await _authenticationService.initialize();
 
+    // Перевіряємо, чи вже створений wishlist
+    if (wishlistId == null) {
       final options = MutationOptions(
         document: gql(startPersonalWishlistMutations),
         variables: <String, dynamic>{
@@ -42,22 +52,31 @@ class SearchService {
       final result = await client.mutate(options);
 
       if (result != null && result.containsKey('startPersonalWishlist')) {
-      final wishlistId = result['startPersonalWishlist']['id'];
+        wishlistId = result['startPersonalWishlist']['id'];
+      }
+    }
+
+    if (wishlistId != null) {
       final sseStream = client.getServerSentEventStream(
         'api/productssearch/search/$wishlistId',
         {'text': message},
       );
 
-      StringBuffer fullMessage = StringBuffer(); // Використовуємо StringBuffer для зберігання повідомлення
-
       await for (final chunk in sseStream) {
-        fullMessage.write(chunk.data); // Додаємо чанк до повідомлення
+        print("Original chunk.data: ${chunk.event}");
+        final cleanedMessage = chunk.data.replaceAll(RegExp(r'(^"|"$)'), '');
+        if(chunk.event == SearchEventType.message)
+        {
+          type = SearchEventType.message;
+        }
+        if(chunk.event == SearchEventType.product)
+        {
+          type = SearchEventType.product;
         }
 
-      final cleanedMessage = fullMessage.toString().replaceAll('"', '');
-
-      final event = ServerSentEvent(SearchEventType.message, cleanedMessage.toString().trim());
+        final event = ServerSentEvent(type, cleanedMessage);
         _sseController.add(event);
       }
     }
   }
+}

lib/screens/chat.dart

@@ -6,15 +6,17 @@ import 'package:shopping_assistant_mobile_client/network/search_service.dart';
 class Message {
   final String text;
   final bool isUser;
+  bool isProduct;
 
-  Message({required this.text, this.isUser = false});
+  Message({required this.text, this.isUser = false, this.isProduct = false});
 }
 
 class MessageBubble extends StatelessWidget {
   final String message;
   final bool isOutgoing;
+  final bool isProduct;
 
-  MessageBubble({required this.message, this.isOutgoing = true});
+  MessageBubble({required this.message, this.isOutgoing = true, this.isProduct = false});
 
   @override
   Widget build(BuildContext context) {
@@ -23,14 +25,35 @@ class MessageBubble extends StatelessWidget {
       child: Container(
         margin: const EdgeInsets.all(8.0),
         padding: const EdgeInsets.all(16.0),
+        constraints: BoxConstraints(
+          maxWidth: 300.0, // Максимальна ширина контейнера
+        ),
         decoration: BoxDecoration(
-          color: isOutgoing ? Colors.blue : Colors.white38,
+          color: isOutgoing ? Colors.blue : Colors.grey[200],
           borderRadius: BorderRadius.circular(10.0),
         ),
-        child: Text(
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
               message,
               style: TextStyle(color: isOutgoing ? Colors.white : Colors.black),
             ),
+            if (isProduct) // Виводимо кнопку тільки для повідомлень типу Product
+              ElevatedButton(
+                onPressed: () {
+                  // Обробка натискання на кнопку "View Product"
+                  print('View Product button pressed');
+                },
+                style: ElevatedButton.styleFrom(
+                  primary: Colors.indigo,
+                  onPrimary: Colors.white,
+                    minimumSize: Size(300, 50)
+                ),
+                child: Text('View Product'),
+              ),
+          ],
+        ),
       ),
     );
   }
@@ -46,31 +69,55 @@ class ChatScreenState extends State<ChatScreen> {
   List<Message> messages = [];
   final TextEditingController _messageController = TextEditingController();
   bool buttonsVisible = true;
+  bool isSendButtonEnabled = false;
+  bool showButtonsContainer = true;
   final ScrollController _scrollController = ScrollController();
 
   String wishlistId = '';
 
-  @override
   void initState() {
     super.initState();
     _searchService.sseStream.listen((event) {
-      _handleSSEMessage(Message(text: '${event.event}: ${event.data}'));
+      _handleSSEMessage(Message(text: '${event.data}'));
     });
   }
 
   void _handleSSEMessage(Message message) {
     setState(() {
+      final lastMessage = messages.isNotEmpty ? messages.last : null;
+      message.isProduct = _searchService.checkerForProduct();
+      print("Product status: ${message.isProduct}");
+      if (lastMessage != null && !lastMessage.isUser && !message.isUser) {
+        final updatedMessage = Message(
+            text: "${lastMessage.text}${message.text}",
+            isProduct: message.isProduct);
+        messages.removeLast();
+        messages.add(updatedMessage);
+      } else {
         messages.add(message);
+      }
     });
+    _scrollToBottom();
   }
 
+
   Future<void> _startPersonalWishlist(String message) async {
+    setState(() {
+      buttonsVisible = false;
+      showButtonsContainer = false;
+    });
     await _searchService.initializeAuthenticationService();
     await _searchService.startPersonalWishlist(message);
+    _scrollToBottom();
   }
 
   Future<void> _sendMessageToAPI(String message) async {
+    setState(() {
+      buttonsVisible = false;
+      showButtonsContainer = false;
+    });
     await _searchService.startPersonalWishlist(message);
+    _scrollToBottom();
 
     setState(() {
       messages.add(Message(text: message, isUser: true));
@@ -90,11 +137,16 @@ class ChatScreenState extends State<ChatScreen> {
     }
 
     _messageController.clear();
+    _scrollToBottom();
+  }
+
+  void _scrollToBottom() {
     _scrollController.animateTo(
       _scrollController.position.maxScrollExtent,
       duration: Duration(milliseconds: 300),
       curve: Curves.easeOut,
-    );}
+    );
+  }
 
   void _showGiftNotAvailable() {
     showDialog(
@@ -149,7 +201,8 @@ class ChatScreenState extends State<ChatScreen> {
                           print('Product button pressed');
                         },
                         style: ElevatedButton.styleFrom(
-                          padding: EdgeInsets.symmetric(horizontal: 30, vertical: 16),
+                          padding: EdgeInsets.symmetric(
+                              horizontal: 30, vertical: 16),
                           shape: RoundedRectangleBorder(
                             borderRadius: BorderRadius.circular(10),
                           ),
@@ -162,7 +215,8 @@ class ChatScreenState extends State<ChatScreen> {
                       ElevatedButton(
                         onPressed: _showGiftNotAvailable,
                         style: ElevatedButton.styleFrom(
-                          padding: EdgeInsets.symmetric(horizontal: 30, vertical: 16),
+                          padding: EdgeInsets.symmetric(
+                              horizontal: 30, vertical: 16),
                           shape: RoundedRectangleBorder(
                             borderRadius: BorderRadius.circular(10),
                           ),
@@ -177,6 +231,56 @@ class ChatScreenState extends State<ChatScreen> {
               ),
             ),
           ),
+          SizedBox(height: 16.0), // Відступ вниз
+          Visibility(
+            visible: showButtonsContainer,
+            child: Container(
+              margin: const EdgeInsets.all(8.0),
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: <Widget>[
+                  Container(
+                    margin: EdgeInsets.all(8),
+                    child: ElevatedButton(
+                      onPressed: () {
+                        _messageController.text = 'Christmas gift🎁';
+                        _sendMessage();
+                      },
+                      style: ElevatedButton.styleFrom(
+                        padding: EdgeInsets.symmetric(horizontal: 30, vertical: 16),
+                        shape: RoundedRectangleBorder(
+                          borderRadius: BorderRadius.circular(10),
+                        ),
+                        primary: Colors.white,
+                        onPrimary: Colors.blue,
+                        side: BorderSide(color: Colors.blue, width: 2.0),
+                      ),
+                      child: Text('Christmas gift🎁', style: TextStyle(color: Colors.grey)),
+                    ),
+                  ),
+                  Container(
+                    margin: EdgeInsets.all(8),
+                    child: ElevatedButton(
+                      onPressed: () {
+                        _messageController.text = 'Birthday gift🎉';
+                        _sendMessage();
+                      },
+                      style: ElevatedButton.styleFrom(
+                        padding: EdgeInsets.symmetric(horizontal: 30, vertical: 16),
+                        shape: RoundedRectangleBorder(
+                          borderRadius: BorderRadius.circular(10),
+                        ),
+                        primary: Colors.white,
+                        onPrimary: Colors.blue,
+                        side: BorderSide(color: Colors.blue, width: 2.0),
+                      ),
+                      child: Text('Birthday gift🎉', style: TextStyle(color: Colors.grey)),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
           Expanded(
             child: ListView.builder(
               controller: _scrollController,
@@ -187,6 +291,7 @@ class ChatScreenState extends State<ChatScreen> {
                 return MessageBubble(
                   message: message.text,
                   isOutgoing: message.isUser,
+                  isProduct: message.isProduct,
                 );
               },
             ),
@@ -198,6 +303,12 @@ class ChatScreenState extends State<ChatScreen> {
                 Expanded(
                   child: TextField(
                     controller: _messageController,
+                    onChanged: (text) {
+                      // Коли текст змінюється, оновлюємо стан кнопки
+                      setState(() {
+                        isSendButtonEnabled = text.isNotEmpty;
+                      });
+                    },
                     decoration: InputDecoration(
                       hintText: 'Enter your message...',
                     ),
@@ -205,7 +316,7 @@ class ChatScreenState extends State<ChatScreen> {
                 ),
                 IconButton(
                   icon: Icon(Icons.send),
-                  onPressed: _sendMessage,
+                  onPressed: isSendButtonEnabled ? _sendMessage : null,
                 ),
               ],
             ),