Notifikasi transaksi: hanya untuk admin + transaksi dari orang lain (bukan transaksi sendiri)

lib/main.dart

@@ -1,13 +1,16 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 
 import 'config.dart';
+import 'models/sale.dart';
 import 'state/app_state.dart';
 import 'services/printer_service.dart';
 import 'screens/login_screen.dart';
 import 'screens/home_page.dart';
 import 'utils/colors.dart';
+import 'utils/format.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -25,12 +28,48 @@ class MyApp extends StatefulWidget {
 
 class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
   late final AppState _appState;
+  final GlobalKey<ScaffoldMessengerState> _scaffoldKey =
+      GlobalKey<ScaffoldMessengerState>();
 
   @override
   void initState() {
     super.initState();
     _appState = AppState();
     WidgetsBinding.instance.addObserver(this);
+    // Dengarkan stream notifikasi transaksi baru (dari HP lain / checkout).
+    _appState.newSaleNotifications.stream.listen(_showSaleNotification);
+  }
+
+  void _showSaleNotification(Sale sale) {
+    final messenger = _scaffoldKey.currentState;
+    if (messenger == null) return;
+    // Getar + bunyi notifikasi.
+    HapticFeedback.heavyImpact();
+    SystemSound.play(SystemSoundType.click);
+    // Banner notifikasi di atas layar.
+    messenger.showSnackBar(
+      SnackBar(
+        content: Row(
+          children: [
+            const Icon(Icons.check_circle, color: kSuccess, size: 20),
+            const SizedBox(width: 10),
+            Expanded(
+              child: Text(
+                'Transaksi baru: ${sale.items.fold<int>(0, (s, i) => s + i.qty)} item • ${formatRupiah(sale.total)}',
+                style: const TextStyle(color: kText, fontWeight: FontWeight.w600),
+              ),
+            ),
+          ],
+        ),
+        backgroundColor: kSurface,
+        behavior: SnackBarBehavior.floating,
+        duration: const Duration(seconds: 4),
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(14),
+          side: const BorderSide(color: kSuccess, width: 1),
+        ),
+      ),
+    );
   }
 
   @override
@@ -54,6 +93,7 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
     return ChangeNotifierProvider.value(
       value: _appState,
       child: MaterialApp(
+        scaffoldMessengerKey: _scaffoldKey,
         title: 'Dutra Store',
         debugShowCheckedModeBanner: false,
         theme: ThemeData(

lib/state/app_state.dart

@@ -27,6 +27,12 @@ class CartLine {
 class AppState extends ChangeNotifier {
   final SupabaseClient _supabase = Supabase.instance.client;
 
+  // Stream notifikasi transaksi baru (dipakai UI untuk banner+suara+getar).
+  // Diisi setiap createSale sukses DAN setiap realtime INSERT dari HP lain.
+  final StreamController<Sale> newSaleNotifications =
+      StreamController<Sale>.broadcast();
+  final Set<String> _notifiedSaleIds = {};
+
   // Client dengan service_role key untuk operasi admin (buat/edit/hapus akun kasir).
   // PERINGATAN: key ini bypass RLS — hanya untuk app POS di device terpercaya.
   final SupabaseClient _admin = SupabaseClient(supabaseUrl, supabaseServiceKey);
@@ -135,6 +141,38 @@ class AppState extends ChangeNotifier {
       if (elapsed < const Duration(seconds: 15)) return;
     }
     await refresh();
+    _checkNewSales();
+  }
+
+  bool _salesFirstLoad = true;
+
+  /// Deteksi transaksi baru dari polling/refresh dan kirim ke stream
+  /// notifikasi. Load pertama dilewati agar tidak spam saat start.
+  void _checkNewSales() {
+    // Hanya admin yang perlu notifikasi — kasir tidak (mereka yang
+    // transaksi, jadi sudah tahu).
+    if (userRole != 'admin') {
+      for (final s in sales) {
+        _notifiedSaleIds.add(s.id);
+      }
+      _salesFirstLoad = false;
+      return;
+    }
+    final now = DateTime.now();
+    for (final s in sales) {
+      if (!_notifiedSaleIds.contains(s.id)) {
+        _notifiedSaleIds.add(s.id);
+        // Lewati transaksi lama (>5 menit) agar tidak spam notif saat start.
+        // Lewati juga transaksi sendiri — admin tahu kalau dia yang jualan.
+        if (!_salesFirstLoad &&
+            s.userId != userId &&
+            now.difference(s.date).inMinutes.abs() <= 5 &&
+            !newSaleNotifications.isClosed) {
+          newSaleNotifications.add(s);
+        }
+      }
+    }
+    _salesFirstLoad = false;
   }
 
   Future<void> refresh() async {
@@ -686,6 +724,11 @@ class AppState extends ChangeNotifier {
       cart.clear();
       _discount = 0;
       notifyListeners();
+
+      // Tandai ID transaksi lokal agar tidak di-notify lagi via polling
+      // (admin yang jualan sendiri tidak perlu notif transaksinya sendiri).
+      _notifiedSaleIds.add(sale.id);
+
       return sale;
     } catch (e) {
       await _offlineQueue.addToQueue({