Merge pull request #4 from Shchoholiev/feature/SA-160-add-product-search

feature/SA-160-add-product-search

lib/main.dart

@@ -2,10 +2,12 @@ import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:graphql/client.dart';
 import 'package:shopping_assistant_mobile_client/network/api_client.dart';
+import 'package:shopping_assistant_mobile_client/screens/chat.dart';
 
 void main() {
   runApp(const MyApp());
 }
+final ApiClient client = ApiClient();
 
 class MyApp extends StatelessWidget {
   const MyApp({super.key});
@@ -34,7 +36,7 @@ class MyApp extends StatelessWidget {
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
         useMaterial3: true,
       ),
-      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+      home: ChatScreen(),
     );
   }
 }

lib/network/authentication_service.dart

@@ -12,11 +12,8 @@ class AuthenticationService {
 
   late SharedPreferences prefs;
 
-  AuthenticationService() {
-    SharedPreferences.getInstance().then((result) => {prefs = result});
-  }
-
   Future<String> getAccessToken() async {
+    prefs = await SharedPreferences.getInstance();
     var accessToken = prefs.getString('accessToken');
     var refreshToken = prefs.getString('refreshToken');
 

lib/network/search_service.dart

@@ -0,0 +1,145 @@
+// search_service.dart
+import 'dart:async';
+import 'package:logger/logger.dart';
+import 'package:graphql_flutter/graphql_flutter.dart';
+import '../models/enums/search_event_type.dart';
+import '../models/server_sent_event.dart';
+import '../network/api_client.dart';
+import '../screens/chat.dart';
+
+const String startPersonalWishlistMutations = r'''
+  mutation startPersonalWishlist($dto: WishlistCreateDtoInput!) {
+    startPersonalWishlist(dto: $dto) {
+      createdById, id, name, type
+    }
+  }
+''';
+
+var logger = Logger();
+
+SearchEventType type = SearchEventType.message;
+
+class SearchService {
+  final ApiClient client = ApiClient();
+
+  late final _sseController = StreamController<ServerSentEvent>();
+
+  Stream<ServerSentEvent> get sseStream => _sseController.stream;
+
+  bool checkerForProduct() {
+    return type == SearchEventType.product;
+  }
+
+  bool checkerForSuggestion() {
+    return type == SearchEventType.product;
+  }
+
+  String? wishlistId;
+
+  Future<String?> generateNameForPersonalWishlist(String wishlistId) async {
+    final options = MutationOptions(
+      document: gql('''
+      mutation GenerateNameForPersonalWishlist(\$wishlistId: String!) {
+        generateNameForPersonalWishlist(wishlistId: \$wishlistId) {
+          id
+          name
+        }
+      }
+    '''),
+      variables: {'wishlistId': wishlistId},
+    );
+
+    final result = await client.mutate(options);
+
+    if (result != null && result.containsKey('generateNameForPersonalWishlist')) {
+      final name = result['generateNameForPersonalWishlist']['name'];
+      return name;
+    }
+
+    return null;
+  }
+
+  Future<String> startPersonalWishlist(String message) async {
+
+    if (wishlistId == null) {
+      final options = MutationOptions(
+        document: gql(startPersonalWishlistMutations),
+        variables: <String, dynamic>{
+          'dto': {'firstMessageText': "What are you looking for?", 'type': 'Product'},
+        },
+      );
+
+      final result = await client.mutate(options);
+
+      if (result != null && result.containsKey('startPersonalWishlist')) {
+        wishlistId = result['startPersonalWishlist']['id'];
+      }
+    }
+    return wishlistId.toString();
+  }
+
+  Future<void> sendMessages(String message) async {
+
+    if (wishlistId != null) {
+      final sseStream = client.getServerSentEventStream(
+        'api/productssearch/search/$wishlistId',
+        {'text': message},
+      );
+
+      await for (final chunk in sseStream) {
+        print("Original chunk.data: ${chunk.event}");
+        final cleanedMessage = chunk.data.replaceAll(RegExp(r'(^"|"$)'), '');
+
+        final event = ServerSentEvent(chunk.event, cleanedMessage);
+        type = chunk.event;
+        _sseController.add(event);
+      }
+    }
+  }
+
+  Future<List<Message>> getMessagesFromPersonalWishlist(String wishlistIdPar, int pageNumber, int pageSize) async {
+    final options = QueryOptions(
+      document: gql('''
+        query MessagesPageFromPersonalWishlist(\$wishlistId: String!, \$pageNumber: Int!, \$pageSize: Int!) {
+          messagesPageFromPersonalWishlist(wishlistId: \$wishlistId, pageNumber: \$pageNumber, pageSize: \$pageSize) {
+            items {
+              id
+              text
+              role
+              createdById
+            }
+          }
+        }
+      '''),
+      variables: {
+        'wishlistId': wishlistIdPar,
+        'pageNumber': pageNumber,
+        'pageSize': pageSize,
+      },
+    );
+
+    logger.d("DOCUMENT: ${options.document}");
+
+    final result = await client.query(options);
+
+    print("RESULT: ${result}");
+    print(result);
+    if (result != null &&
+        result.containsKey('messagesPageFromPersonalWishlist') &&
+        result['messagesPageFromPersonalWishlist'] != null &&
+        result['messagesPageFromPersonalWishlist']['items'] != null) {
+      final List<dynamic> items = result['messagesPageFromPersonalWishlist']['items'];
+
+      final List<Message> messages = items.map((item) {
+        return Message(
+          text: item['text'],
+          role: item['role'],
+          isProduct: false,
+        );
+      }).toList();
+
+      return messages;
+    }
+    return [];
+  }
+}

lib/screens/chat.dart

@@ -0,0 +1,408 @@
+// search_screen.dart
+import 'package:flutter/material.dart';
+import 'package:flutter_spinkit/flutter_spinkit.dart';
+import 'package:logger/logger.dart';
+import 'package:shopping_assistant_mobile_client/network/search_service.dart';
+
+class Message {
+  final String text;
+  final String role;
+  bool isProduct;
+  bool isSuggestion;
+
+  Message({required this.text, this.role = "", this.isProduct = false, this.isSuggestion = false});
+}
+
+class MessageBubble extends StatelessWidget {
+  final String message;
+  final bool isOutgoing;
+  final bool isProduct;
+
+  MessageBubble({required this.message, this.isOutgoing = true, this.isProduct = false});
+
+  @override
+  Widget build(BuildContext context) {
+    return Align(
+      alignment: isOutgoing ? Alignment.centerRight : Alignment.centerLeft,
+      child: Container(
+        margin: const EdgeInsets.all(8.0),
+        padding: const EdgeInsets.all(16.0),
+        constraints: BoxConstraints(
+          maxWidth: 300.0,
+        ),
+        decoration: BoxDecoration(
+          color: isOutgoing ? Colors.blue : Colors.grey[200],
+          borderRadius: BorderRadius.circular(10.0),
+        ),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              message,
+              style: TextStyle(color: isOutgoing ? Colors.white : Colors.black),
+            ),
+            if (isProduct)
+              ElevatedButton(
+                onPressed: () {
+                  print('View Product button pressed');
+                },
+                style: ElevatedButton.styleFrom(
+                    primary: Colors.indigo,
+                    onPrimary: Colors.white,
+                    minimumSize: Size(300, 50)
+                ),
+                child: Text('View Product'),
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class ChatScreen extends StatefulWidget {
+  @override
+  State createState() => ChatScreenState();
+}
+
+class ChatScreenState extends State<ChatScreen> {
+  var logger = Logger();
+  final SearchService _searchService = SearchService();
+  List<Message> messages = [];
+  final TextEditingController _messageController = TextEditingController();
+  bool buttonsVisible = true;
+  bool isSendButtonEnabled = false;
+  bool showButtonsContainer = true;
+  bool isWaitingForResponse = false;
+  final ScrollController _scrollController = ScrollController();
+  late Widget appBarTitle;
+
+  String wishlistId = '';
+
+  void initState() {
+    super.initState();
+    appBarTitle = Text('New Chat');
+    _searchService.sseStream.listen((event) {
+      _handleSSEMessage(Message(text: '${event.data}'));
+    });
+    Future.delayed(Duration(milliseconds: 2000));
+    if(!wishlistId.isEmpty)
+    {
+      _loadPreviousMessages();
+      showButtonsContainer = false;
+      buttonsVisible = false;
+    }
+  }
+
+  Future<void> _loadPreviousMessages() async {
+    final pageNumber = 1;
+    final pageSize = 200;
+    try {
+      final previousMessages = await _searchService.getMessagesFromPersonalWishlist("6560b4c210686c50ed4b9fec", pageNumber, pageSize);
+      final reversedMessages = previousMessages.reversed.toList();
+      setState(() {
+        messages.addAll(reversedMessages);
+      });
+      logger.d('Previous Messages: $previousMessages');
+
+      for(final message in messages)
+      {
+        logger.d("MESSAGES TEXT: ${message.text}");
+        logger.d("MESSAGES ROLE: ${message.role}");
+      }
+    } catch (error) {
+      logger.d('Error loading previous messages: $error');
+    }
+  }
+
+  void _handleSSEMessage(Message message) {
+    setState(() {
+      isWaitingForResponse = true;
+      final lastMessage = messages.isNotEmpty ? messages.last : null;
+      message.isProduct = _searchService.checkerForProduct();
+      message.isSuggestion = _searchService.checkerForSuggestion();
+      logger.d("Product status: ${message.isProduct}");
+      if (lastMessage != null && lastMessage.role != "User" && message.role != "User") {
+        final updatedMessage = Message(
+            text: "${lastMessage.text}${message.text}",
+            role: "Application",
+            isProduct: message.isProduct);
+        messages.removeLast();
+        messages.add(updatedMessage);
+      } else {
+        messages.add(message);
+      }
+    });
+    setState(() {
+      isWaitingForResponse = false;
+    });
+    _scrollToBottom();
+  }
+
+  Future<void> updateChatTitle(String wishlistId) async {
+    final wishlistName = await _searchService.generateNameForPersonalWishlist(wishlistId);
+    if (wishlistName != null) {
+      setState(() {
+        appBarTitle = Text(wishlistName);
+      });
+    }
+  }
+
+  Future<void> _startPersonalWishlist(String message) async {
+    setState(() {
+      buttonsVisible = false;
+      showButtonsContainer = false;
+      isWaitingForResponse = true;
+    });
+    wishlistId = await _searchService.startPersonalWishlist(message);
+    await _sendMessageToAPI(message);
+    await updateChatTitle(_searchService.wishlistId.toString());
+    _scrollToBottom();
+
+    setState(() {
+      isWaitingForResponse = false;
+    });
+  }
+
+  Future<void> _sendMessageToAPI(String message)async {
+    setState(() {
+      buttonsVisible = false;
+      showButtonsContainer = false;
+      isWaitingForResponse = true;
+    });
+    await _searchService.sendMessages(message);
+    _scrollToBottom();
+
+    setState(() {
+      isWaitingForResponse = false;
+    });
+  }
+
+  void _sendMessage() {
+    final message = _messageController.text;
+
+    if (wishlistId.isEmpty) {
+      setState(() {
+        messages.add(Message(text: "What are you looking for?", role: "Application"));
+        messages.add(Message(text: message, role: "User"));
+      });
+      _startPersonalWishlist(message);
+    } else {
+      setState(() {
+        messages.add(Message(text: message, role: "User"));
+      });
+      _sendMessageToAPI(message);
+    }
+
+    _messageController.clear();
+    _scrollToBottom();
+  }
+
+  void _scrollToBottom() {
+    _scrollController.animateTo(
+      _scrollController.position.maxScrollExtent,
+      duration: Duration(milliseconds: 300),
+      curve: Curves.easeOut,
+    );
+  }
+
+  void _showGiftNotAvailable() {
+    showDialog(
+      context: context,
+      builder: (BuildContext context) {
+        return AlertDialog(
+          title: Text('Gift Functionality'),
+          content: Text('This function is currently unavailable.'),
+          actions: <Widget>[
+            TextButton(
+              child: Text('OK'),
+              onPressed: () {
+                Navigator.of(context).pop();
+              },
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: appBarTitle,
+        centerTitle: true,
+        leading: IconButton(
+          icon: Icon(Icons.arrow_back),
+          onPressed: () {
+            print('Back button pressed');
+          },
+        ),
+      ),
+      body: Column(
+        children: <Widget>[
+          Visibility(
+            visible: buttonsVisible,
+            child: Align(
+              alignment: Alignment.topCenter,
+              child: Column(
+                children: [
+                  Text(
+                    'Choose an Option',
+                    style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+                  ),
+                  Row(
+                    mainAxisAlignment: MainAxisAlignment.center,
+                    children: <Widget>[
+                      ElevatedButton(
+                        onPressed: () {
+                          print('Product button pressed');
+                        },
+                        style: ElevatedButton.styleFrom(
+                          padding: EdgeInsets.symmetric(
+                              horizontal: 30, vertical: 16),
+                          shape: RoundedRectangleBorder(
+                            borderRadius: BorderRadius.circular(10),
+                          ),
+                          primary: Colors.blue,
+                          onPrimary: Colors.white,
+                        ),
+                        child: Text('Product'),
+                      ),
+                      SizedBox(width: 16.0),
+                      ElevatedButton(
+                        onPressed: _showGiftNotAvailable,
+                        style: ElevatedButton.styleFrom(
+                          padding: EdgeInsets.symmetric(
+                              horizontal: 30, vertical: 16),
+                          shape: RoundedRectangleBorder(
+                            borderRadius: BorderRadius.circular(10),
+                          ),
+                          primary: Colors.white,
+                          onPrimary: Colors.black,
+                        ),
+                        child: Text('Gift'),
+                      ),
+                    ],
+                  ),
+                ],
+              ),
+            ),
+          ),
+          SizedBox(height: 16.0),
+          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,
+              reverse: false,
+              itemCount: messages.length,
+              itemBuilder: (context, index) {
+                final message = messages[index];
+                return MessageBubble(
+                  message: message.text,
+                  isOutgoing: message.role == "User",
+                  isProduct: message.isProduct,
+                );
+              },
+            ),
+          ),
+          if (isWaitingForResponse)
+            SpinKitFadingCircle(
+              color: Colors.blue,
+              size: 25.0,
+            ),
+          if (messages.any((message) => message.isSuggestion))
+            Container(
+              padding: EdgeInsets.all(8.0),
+              color: Colors.grey[300],
+              child: Row(
+                children: [
+                  Icon(Icons.lightbulb),
+                  SizedBox(width: 8.0),
+                  Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: messages
+                        .where((message) => message.isSuggestion)
+                        .map((message) => Text(message.text))
+                        .toList(),
+                  ),
+                ],
+              ),
+            ),
+          Container(
+            margin: const EdgeInsets.all(8.0),
+            child: Row(
+              children: <Widget>[
+                Expanded(
+                  child: TextField(
+                    controller: _messageController,
+                    onChanged: (text) {
+                      setState(() {
+                        isSendButtonEnabled = text.isNotEmpty;
+                      });
+                    },
+                    decoration: InputDecoration(
+                      hintText: 'Enter your message...',
+                    ),
+                  ),
+                ),
+                IconButton(
+                  icon: Icon(Icons.send),
+                  onPressed: isSendButtonEnabled ? _sendMessage : null,
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

pubspec.yaml

@@ -30,7 +30,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-
+  flutter_spinkit: ^5.0.0
+  logger: ^2.0.2+1
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.