dependencies:
  flutter:
    sdk: flutter
  image_picker: ^1.1.2        # camera + gallery
  file_picker: ^8.1.2         # pilih file
  flutter_pdfview: ^1.3.2     # tampilkan PDF
  pdf: ^3.11.1                # generate PDF
  printing: ^5.13.2           # print / preview PDF
  share_plus: ^10.1.2         # share ke app lain
  firebase_messaging: ^15.1.3 # push notification
  flutter_local_notifications: ^17.2.3
  app_links: ^6.3.2           # deep link
  url_launcher: ^6.3.1        # buka URL/telepon/email
  path_provider: ^2.1.4       # akses folder lokal

import 'dart:io';
import 'package:image_picker/image_picker.dart';

class CameraService {
  final ImagePicker _picker = ImagePicker();

  /// Buka kamera, kembalikan File foto (null jika dibatalkan)
  Future<File?> takePhoto() async {
    final XFile? shot = await _picker.pickImage(
      source: ImageSource.camera,
      imageQuality: 80,        // kompres 80%
      maxWidth: 1280,
    );
    if (shot == null) return null; // user batal
    return File(shot.path);
  }
}

ElevatedButton.icon(
  icon: const Icon(Icons.camera_alt),
  label: const Text('Ambil Foto'),
  onPressed: () async {
    final file = await CameraService().takePhoto();
    if (file != null) setState(() => _photo = file);
  },
);
// menampilkan: _photo != null ? Image.file(_photo!) : Placeholder()

final ImagePicker _picker = ImagePicker();

// satu foto
Future<File?> pickOne() async {
  final x = await _picker.pickImage(source: ImageSource.gallery);
  return x == null ? null : File(x.path);
}

// banyak foto sekaligus
Future<List<File>> pickMany() async {
  final list = await _picker.pickMultiImage(imageQuality: 80);
  return list.map((x) => File(x.path)).toList();
}

import 'package:file_picker/file_picker.dart';

Future<PlatformFile?> pickDocument() async {
  final result = await FilePicker.platform.pickFiles(
    type: FileType.custom,
    allowedExtensions: ['pdf', 'docx', 'xlsx'],
    allowMultiple: false,
  );
  if (result == null) return null;        // dibatalkan
  final file = result.files.single;
  print('Nama: ${file.name}, ukuran: ${file.size} bytes');
  return file;                            // file.path -> lokasi file
}

import 'package:flutter_pdfview/flutter_pdfview.dart';

class PdfViewPage extends StatelessWidget {
  final String path;             // path file PDF lokal
  const PdfViewPage({super.key, required this.path});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Baca PDF')),
      body: PDFView(
        filePath: path,
        swipeHorizontal: true,
        onPageChanged: (page, total) =>
            debugPrint('Halaman ${page! + 1} dari $total'),
      ),
    );
  }
}

import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';

Future<void> buildReport(List<String> tasks) async {
  final doc = pw.Document();
  doc.addPage(pw.Page(
    pageFormat: PdfPageFormat.a4,
    build: (ctx) => pw.Column(
      crossAxisAlignment: pw.CrossAxisAlignment.start,
      children: [
        pw.Text('Laporan Tugas',
            style: pw.TextStyle(fontSize: 24, fontWeight: pw.FontWeight.bold)),
        pw.SizedBox(height: 16),
        ...tasks.map((t) => pw.Bullet(text: t)),
      ],
    ),
  ));
  // preview + opsi print/share bawaan OS
  await Printing.layoutPdf(onLayout: (format) async => doc.save());
}

import 'package:share_plus/share_plus.dart';

// berbagi teks / link
Future<void> shareText(String msg) =>
    Share.share(msg, subject: 'Dari Productivity App');

// berbagi file (mis. PDF hasil generate)
Future<void> shareFile(String path) async {
  await Share.shareXFiles(
    [XFile(path)],
    text: 'Ini laporan tugasku 📄',
  );
}

import 'package:firebase_messaging/firebase_messaging.dart';

class PushService {
  final _fcm = FirebaseMessaging.instance;

  Future<void> init() async {
    // 1. minta izin (Android 13+ / iOS)
    await _fcm.requestPermission();
    // 2. ambil token device (kirim ke server-mu)
    final token = await _fcm.getToken();
    print('FCM token: $token');
    // 3. pesan saat app dibuka (foreground)
    FirebaseMessaging.onMessage.listen((msg) {
      print('Pesan masuk: ${msg.notification?.title}');
    });
    // 4. user tap notifikasi -> app dibuka
    FirebaseMessaging.onMessageOpenedApp.listen((msg) {
      // navigasi ke halaman terkait
    });
  }
}

import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:timezone/timezone.dart' as tz;

final plugin = FlutterLocalNotificationsPlugin();

Future<void> scheduleReminder(DateTime when, String title) async {
  await plugin.zonedSchedule(
    0,                                   // id notifikasi
    title,
    'Saatnya mengerjakan tugasmu!',
    tz.TZDateTime.from(when, tz.local),
    const NotificationDetails(
      android: AndroidNotificationDetails(
        'reminder_channel', 'Pengingat Tugas',
        importance: Importance.max, priority: Priority.high,
      ),
    ),
    androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
  );
}

import 'package:app_links/app_links.dart';

final _appLinks = AppLinks();

Future<void> initDeepLinks(GlobalKey<NavigatorState> navKey) async {
  // saat app dibuka dari kondisi mati
  final initial = await _appLinks.getInitialLink();
  if (initial != null) _handle(initial, navKey);

  // saat app sedang berjalan
  _appLinks.uriLinkStream.listen((uri) => _handle(uri, navKey));
}

void _handle(Uri uri, GlobalKey<NavigatorState> navKey) {
  // myapp://task/42  -> pathSegments = ['task','42']
  if (uri.pathSegments.first == 'task') {
    final id = uri.pathSegments[1];
    navKey.currentState?.pushNamed('/task', arguments: id);
  }
}

import 'package:url_launcher/url_launcher.dart';

Future<void> openUrl(String url) async {
  final uri = Uri.parse(url);
  if (await canLaunchUrl(uri)) {
    await launchUrl(uri, mode: LaunchMode.externalApplication);
  }
}

// contoh pemakaian
openUrl('https://flutter.dev');     // browser
openUrl('tel:+628123456789');       // panggil
openUrl('mailto:guru@sekolah.id');  // email
openUrl('https://wa.me/628123456'); // WhatsApp

import 'package:permission_handler/permission_handler.dart';

Future<bool> ensureCamera() async {
  final status = await Permission.camera.status;
  if (status.isGranted) return true;
  if (status.isPermanentlyDenied) {
    await openAppSettings();        // arahkan ke pengaturan
    return false;
  }
  final result = await Permission.camera.request();
  return result.isGranted;
}

lib/
├─ features/task/
│  ├─ presentation/   # TaskPage, TaskDetailPage (deep link target)
│  ├─ application/     # TaskController (Riverpod Notifier)
│  ├─ domain/          # Task entity, TaskRepository (abstract)
│  └─ data/            # TaskRepositoryImpl + local storage
├─ core/services/
│  ├─ camera_service.dart      # ① ②  image_picker
│  ├─ file_service.dart        # ③     file_picker
│  ├─ pdf_service.dart         # ④ ⑤  view + generate
│  ├─ share_service.dart       # ⑥     share_plus
│  ├─ notification_service.dart# ⑦ ⑧  push + local
│  └─ link_service.dart        # ⑨ ⑩  deep link + launcher
└─ main.dart                   # init Firebase, notif, deep link

class Task {
  final String id, title;
  final String? photoPath, filePath;
  final DateTime? reminder;
  Task({required this.id, required this.title,
        this.photoPath, this.filePath, this.reminder});
}

class TaskController extends StateNotifier<List<Task>> {
  TaskController(this._cam, this._notif) : super([]);
  final CameraService _cam;
  final NotificationService _notif;

  Future<void> addWithPhoto(String title, DateTime when) async {
    final photo = await _cam.takePhoto();                 // ①
    final task = Task(
      id: DateTime.now().millisecondsSinceEpoch.toString(),
      title: title, photoPath: photo?.path, reminder: when);
    state = [...state, task];
    await _notif.scheduleReminder(when, title);            // ⑧
  }
}

Future<void> exportAndShare(List<Task> tasks) async {
  final path = await PdfService().buildReport(tasks);  // ⑤ generate
  await ShareService().shareFile(path);                // ⑥ share
}