feat: STOMP WebSocket client implementation and UI Guardian Dashboard

walkguide-mobile/walkguide_app/lib/core/services/websocket_service.dart

@@ -1,41 +1,193 @@
 import 'dart:async';
+import 'dart:convert';
 
 import 'package:flutter/foundation.dart';
-import 'package:web_socket_channel/web_socket_channel.dart';
+import 'package:stomp_dart_client/stomp_dart_client.dart';
 
 import '../constants/app_constants.dart';
 import '../storage/secure_storage.dart';
 
+/// WebSocket Service pakai STOMP (stomp_dart_client).
+///
+/// Spring Boot backend pakai @EnableWebSocketMessageBroker dengan SockJS.
+/// Flutter connect pakai STOMP agar bisa subscribe ke topic spesifik per user.
+///
+/// Subscriptions yang dipakai:
+///   Guardian  → /topic/location/{userId}    live GPS update
+///   Guardian  → /queue/sos/{guardianId}     SOS alert real-time
+///   User      → /queue/notif/{userId}       notifikasi dari Guardian
 class WebSocketService {
   final SecureStorage _storage;
-  WebSocketChannel? _channel;
-  StreamSubscription? _subscription;
+
+  StompClient? _client;
+  bool _connected = false;
+
+  // Subscription callbacks
+  void Function(double lat, double lng)? _onLocation;
+  void Function(Map<String, dynamic> sosData)? _onSos;
+  void Function(Map<String, dynamic> notifData)? _onNotif;
+
+  // Subscription frames (untuk unsubscribe)
+  StompUnsubscribe? _locationUnsub;
+  StompUnsubscribe? _sosUnsub;
+  StompUnsubscribe? _notifUnsub;
 
   WebSocketService(this._storage);
 
-  Future<void> connect(String serverUrl, {void Function(dynamic event)? onMessage}) async {
+  bool get isConnected => _connected;
+
+  /// Connect ke WebSocket server.
+  /// Dipanggil setelah login berhasil (dari screens.dart _startPostLoginServices).
+  Future<void> connect(String serverUrl) async {
     await disconnect();
+
     final token = await _storage.getAccessToken();
-    final wsUrl = Uri.parse('${AppConstants.buildWsUrl(serverUrl)}${token == null ? '' : '?token=$token'}');
+    final wsUrl = AppConstants.buildWsUrl(serverUrl);
+
+    final completer = Completer<void>();
+
+    _client = StompClient(
+      config: StompConfig(
+        url: wsUrl,
+        onConnect: (frame) {
+          _connected = true;
+          debugPrint('[WS] STOMP connected to $wsUrl');
+          if (!completer.isCompleted) completer.complete();
+        },
+        onDisconnect: (frame) {
+          _connected = false;
+          debugPrint('[WS] STOMP disconnected');
+        },
+        onStompError: (frame) {
+          debugPrint('[WS] STOMP error: ${frame.body}');
+          if (!completer.isCompleted) {
+            completer.completeError(frame.body ?? 'STOMP error');
+          }
+        },
+        onWebSocketError: (dynamic error) {
+          debugPrint('[WS] WebSocket error: $error');
+          _connected = false;
+          if (!completer.isCompleted) completer.completeError(error);
+        },
+        onUnhandledMessage: (frame) {
+          debugPrint('[WS] Unhandled: ${frame.body}');
+        },
+        // Inject JWT token di header STOMP CONNECT
+        stompConnectHeaders:
+            token != null ? {'Authorization': 'Bearer $token'} : {},
+        webSocketConnectHeaders:
+            token != null ? {'Authorization': 'Bearer $token'} : {},
+        reconnectDelay: const Duration(seconds: 5),
+      ),
+    );
+
+    _client!.activate();
+
+    // Tunggu connected atau timeout
     try {
-      _channel = WebSocketChannel.connect(wsUrl);
-      _subscription = _channel!.stream.listen(
-        onMessage ?? (event) => debugPrint('$event'),
-        onError: (Object error, StackTrace stackTrace) => debugPrint('$error'),
-      );
+      await completer.future.timeout(const Duration(seconds: 5));
     } catch (e) {
-      debugPrint('WebSocket connect skipped: $e');
+      debugPrint('[WS] Connect timeout/error: $e');
+      // Don't throw — let dashboard work without WS
     }
   }
 
-  void send(Object message) {
-    _channel?.sink.add(message);
+  /// Subscribe ke live GPS updates dari User.
+  /// Guardian panggil ini setelah connect.
+  /// [userId] = ID dari ROLE_USER yang dipair.
+  void subscribeLocation(String userId,
+      void Function(double lat, double lng) callback) {
+    _onLocation = callback;
+    if (_client == null || !_connected) {
+      debugPrint('[WS] subscribeLocation skipped — not connected');
+      return;
+    }
+    _locationUnsub?.call(); // unsubscribe sebelumnya jika ada
+    _locationUnsub = _client!.subscribe(
+      destination: '/topic/location/$userId',
+      callback: (frame) {
+        try {
+          final data =
+              jsonDecode(frame.body ?? '{}') as Map<String, dynamic>;
+          final lat = (data['lat'] as num?)?.toDouble();
+          final lng = (data['lng'] as num?)?.toDouble();
+          if (lat != null && lng != null) {
+            _onLocation?.call(lat, lng);
+          }
+        } catch (e) {
+          debugPrint('[WS] Location parse error: $e');
+        }
+      },
+    );
+    debugPrint('[WS] Subscribed to /topic/location/$userId');
   }
 
+  /// Subscribe ke SOS alert untuk Guardian.
+  /// [guardianId] = ID dari ROLE_GUARDIAN yang login.
+  void subscribeSos(void Function(Map<String, dynamic> sosData) callback) {
+    _onSos = callback;
+    if (_client == null || !_connected) return;
+
+    _storage.getUserId().then((guardianId) {
+      if (guardianId == null) return;
+      _sosUnsub?.call();
+      _sosUnsub = _client!.subscribe(
+        destination: '/queue/sos/$guardianId',
+        callback: (frame) {
+          try {
+            final data =
+                jsonDecode(frame.body ?? '{}') as Map<String, dynamic>;
+            _onSos?.call(data);
+          } catch (e) {
+            debugPrint('[WS] SOS parse error: $e');
+          }
+        },
+      );
+      debugPrint('[WS] Subscribed to /queue/sos/$guardianId');
+    });
+  }
+
+  /// Subscribe ke notifikasi Guardian → User.
+  /// [userId] = ID dari ROLE_USER yang login.
+  void subscribeNotification(
+      void Function(Map<String, dynamic> notifData) callback) {
+    _onNotif = callback;
+    if (_client == null || !_connected) return;
+
+    _storage.getUserId().then((userId) {
+      if (userId == null) return;
+      _notifUnsub?.call();
+      _notifUnsub = _client!.subscribe(
+        destination: '/queue/notif/$userId',
+        callback: (frame) {
+          try {
+            final data =
+                jsonDecode(frame.body ?? '{}') as Map<String, dynamic>;
+            _onNotif?.call(data);
+          } catch (e) {
+            debugPrint('[WS] Notif parse error: $e');
+          }
+        },
+      );
+      debugPrint('[WS] Subscribed to /queue/notif/$userId');
+    });
+  }
+
+  /// Disconnect dan cleanup semua subscriptions.
   Future<void> disconnect() async {
-    await _subscription?.cancel();
-    _subscription = null;
-    await _channel?.sink.close();
-    _channel = null;
+    _locationUnsub?.call();
+    _sosUnsub?.call();
+    _notifUnsub?.call();
+    _locationUnsub = null;
+    _sosUnsub = null;
+    _notifUnsub = null;
+    _client?.deactivate();
+    _client = null;
+    _connected = false;
+  }
+
+  // Legacy compat — lama pakai onMessage raw
+  void send(Object message) {
+    debugPrint('[WS] send() not used in STOMP mode. Use subscribe callbacks.');
   }
 }