TKK_E32230939/poultryrail/lib/main.dart

import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

import 'firebase_options.dart';
import 'dashboard.dart';

// 🔔 LOCAL NOTIFICATION
final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
    FlutterLocalNotificationsPlugin();

// 🔥 REALTIME DATABASE
final dbRef = FirebaseDatabase.instance.ref("sensor");

// 🔥 ANTI SPAM
bool notifHabisSudahMuncul = false;
bool notifKosongSudahMuncul = false;
bool notifFullSudahMuncul = false;
bool notifBerhasilSudahMuncul = false;

final statusRef = FirebaseDatabase.instance.ref("status");

int lastHeartbeat = 0;
DateTime lastHeartbeatTime = DateTime.now();

bool notifOfflineSudahMuncul = false;

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );

  FirebaseMessaging messaging = FirebaseMessaging.instance;

  await messaging.requestPermission(
    alert: true,
    badge: true,
    sound: true,
  );

  const AndroidInitializationSettings androidSettings =
      AndroidInitializationSettings('@mipmap/ic_launcher');

  const InitializationSettings settings =
      InitializationSettings(
    android: androidSettings,
  );

  await flutterLocalNotificationsPlugin.initialize(settings);

  startRealtimeNotif();
  monitorHeartbeat();

  runApp(const MyApp());
}

// 🔥 MONITOR HEARTBEAT
void monitorHeartbeat() {

  statusRef.child("heartbeat").onValue.listen((event) {

    int heartbeat = 0;

    if (event.snapshot.value != null) {
      heartbeat = (event.snapshot.value as num).toInt();
    }

    if (heartbeat != lastHeartbeat) {

      lastHeartbeat = heartbeat;
      lastHeartbeatTime = DateTime.now();

      notifOfflineSudahMuncul = false;
    }
  });

  Stream.periodic(
    const Duration(seconds: 1),
  ).listen((_) {

    int selisih = DateTime.now()
        .difference(lastHeartbeatTime)
        .inSeconds;

    if (selisih >= 5 &&
        !notifOfflineSudahMuncul) {

      notifOfflineSudahMuncul = true;

      showNotif(
        "⚠️ Perangkat Offline",
        "Jaringan lemah atau perangkat tidak terhubung.",
      );
    }
  });
}

// 🔥 REALTIME LISTENER
void startRealtimeNotif() {

  dbRef.onValue.listen((event) {

    final data = event.snapshot.value as Map?;

    if (data != null) {

      double jarak =
          (data['jarak'] ?? 0).toDouble();

      double berat1 =
          (data['berat1'] ?? 0).toDouble();

      double berat2 =
          (data['berat2'] ?? 0).toDouble();

// 🔥 HITUNG PERSEN
double persen =
    ((12 - jarak) / 8) * 100;

if (persen < 0) persen = 0;
if (persen > 100) persen = 100;

// ================================
// 🔔 PAKAN FULL (100%)
// ================================
if (persen >= 100 &&
    !notifFullSudahMuncul) {

  notifFullSudahMuncul = true;

  showNotif(
    "Pakan Full",
    "Wadah penampung pakan penuh.",
  );
}

// RESET
if (persen < 100) {
  notifFullSudahMuncul = false;
}

// ================================
// 🔔 PAKAN HAMPIR HABIS (25%)
// ================================
if (persen <= 25 &&
    persen > 0 &&
    !notifHabisSudahMuncul) {

  notifHabisSudahMuncul = true;

  showNotif(
    "Pakan Hampir Habis",
    "Segera isi ulang wadah penampung pakan.",
  );
}

// RESET
if (persen > 25 || persen <= 0) {
  notifHabisSudahMuncul = false;
}

// ================================
// 🔔 PAKAN HABIS (0%)
// ================================
if (persen <= 0 &&
    !notifKosongSudahMuncul) {

  notifKosongSudahMuncul = true;

  showNotif(
    "Pakan Habis",
    "Wadah penampung pakan sudah kosong.",
  );
}

// RESET
if (persen > 0) {
  notifKosongSudahMuncul = false;
}

// ================================
// 🔔 PEMBERIAN PAKAN BERHASIL
// ================================
bool pakanBerhasil =
    berat1 > 0 || berat2 > 0;

if (pakanBerhasil &&
    !notifBerhasilSudahMuncul) {

  notifBerhasilSudahMuncul = true;

  showNotif(
    "Pemberian Pakan Berhasil",
    "Pakan berhasil diberikan ke wadah pakan.",
  );
}

// RESET
if (!pakanBerhasil) {
  notifBerhasilSudahMuncul = false;
}
    }
  });
}

// 🔔 FUNGSI TAMPILKAN NOTIFIKASI
Future<void> showNotif(
  String title,
  String body,
) async {

  const AndroidNotificationDetails androidDetails =
      AndroidNotificationDetails(
    'pakan_channel',
    'Notifikasi Pakan',
    importance: Importance.max,
    priority: Priority.high,
  );

  const NotificationDetails details =
      NotificationDetails(
    android: androidDetails,
  );

  await flutterLocalNotificationsPlugin.show(
    0,
    title,
    body,
    details,
  );
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Dashboard(),
    );
  }
}