Flutter + Firebase Integration: Panduan Lengkap

# Install FlutterFire CLI secara global
dart pub global activate flutterfire_cli

# Pastikan PATH sudah benek
export PATH="$PATH:$HOME/.pub-cache/bin"

# Jalankan konfigurasi Firebase dari root project Flutter
cd my_flutter_app
flutterfire configure

dependencies:
  flutter:
    sdk: flutter

  # Firebase Core — wajib ada
  firebase_core: ^3.8.1

  # Firebase Auth
  firebase_auth: ^5.4.1

  # Cloud Firestore
  cloud_firestore: ^5.6.5

  # Firebase Storage
  firebase_storage: ^12.4.1

  # Cloud Messaging
  firebase_messaging: ^15.2.1

  # Cloud Functions (jika perlu panggil fungsi backend)
  cloud_functions: ^5.2.1

  # Firebase Analytics & Crashlytics
  firebase_analytics: ^11.4.1
  firebase_crashlytics: ^4.3.1

  # State Management
  provider: ^6.1.2
  # atau riverpod
  # flutter_riverpod: ^2.6.1

import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'firebase_options.dart';

void main() async {
  // Pastikan widget binding sudah terinisialisasi
  WidgetsFlutterBinding.ensureInitialized();

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

  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'My Firebase App',
      theme: ThemeData(
        colorSchemeSeed: Colors.blue,
        useMaterial3: true,
      ),
      home: const AuthGate(),
    );
  }
}

// Gate: cek status login, arahkan ke halaman yang tepat
class AuthGate extends StatelessWidget {
  const AuthGate({super.key});

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<User?>(
      stream: FirebaseAuth.instance.authStateChanges(),
      builder: (context, snapshot) {
        // Loading
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Scaffold(
            body: Center(child: CircularProgressIndicator()),
          );
        }

        // Sudah login → ke Home
        if (snapshot.hasData) {
          return const HomePage();
        }

        // Belum login → ke Login
        return const LoginPage();
      },
    );
  }
}

import 'package:firebase_auth/firebase_auth.dart';

class AuthService {
  final FirebaseAuth _auth = FirebaseAuth.instance;

  // Stream perubahan status autentikasi
  Stream<User?> get authStateChanges => _auth.authStateChanges();

  // User yang sedang login
  User? get currentUser => _auth.currentUser;

  // Register dengan email & password
  Future<UserCredential?> registerWithEmail({
    required String email,
    required String password,
    required String displayName,
  }) async {
    try {
      final credential = await _auth.createUserWithEmailAndPassword(
        email: email,
        password: password,
      );

      // Update display name
      await credential.user?.updateDisplayName(displayName);

      return credential;
    } on FirebaseAuthException catch (e) {
      _handleAuthError(e);
      return null;
    }
  }

  // Login dengan email & password
  Future<UserCredential?> loginWithEmail({
    required String email,
    required String password,
  }) async {
    try {
      return await _auth.signInWithEmailAndPassword(
        email: email,
        password: password,
      );
    } on FirebaseAuthException catch (e) {
      _handleAuthError(e);
      return null;
    }
  }

  // Reset password
  Future<void> resetPassword(String email) async {
    await _auth.sendPasswordResetEmail(email: email);
  }

  // Logout
  Future<void> signOut() async {
    await _auth.signOut();
  }

  // Handle error autentikasi
  void _handleAuthError(FirebaseAuthException e) {
    switch (e.code) {
      case 'user-not-found':
        print('User tidak ditemukan');
        break;
      case 'wrong-password':
        print('Password salah');
        break;
      case 'email-already-in-use':
        print('Email sudah terdaftar');
        break;
      case 'weak-password':
        print('Password terlalu lemah');
        break;
      case 'invalid-email':
        print('Format email tidak valid');
        break;
      default:
        print('Error: ${e.message}');
    }
  }
}

import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';

class GoogleAuthService {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final GoogleSignIn _google = GoogleSignIn();

  // Login dengan Google
  Future<UserCredential?> signInWithGoogle() async {
    try {
      // 1. Munculkan dialog Google Sign-In
      final GoogleSignInAccount? googleUser = await _google.signIn();

      if (googleUser == null) return null; // User membatalkan

      // 2. Ambil authentication details
      final GoogleSignInAuthentication googleAuth =
          await googleUser.authentication;

      // 3. Buat credential Firebase
      final OAuthCredential credential = GoogleAuthProvider.credential(
        accessToken: googleAuth.accessToken,
        idToken: googleAuth.idToken,
      );

      // 4. Login ke Firebase dengan credential
      return await _auth.signInWithCredential(credential);
    } catch (e) {
      print('Error Google Sign-In: $e');
      return null;
    }
  }

  // Logout dari Google dan Firebase
  Future<void> signOutGoogle() async {
    await _google.signOut();
    await _auth.signOut();
  }
}

class PhoneAuthService {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  ConfirmationResult? _confirmationResult;

  // Kirim OTP ke nomor telepon
  Future<void> sendOTP(String phoneNumber) async {
    _confirmationResult = await _auth.signInWithPhoneNumber(
      phoneNumber,
      // Opsional: verifikasi otomatis tanpa SMS (reCAPTCHA)
      // PhoneAuthProvider.credential(
      //   verificationCompleted: (PhoneAuthCredential credential) async {
      //     await _auth.signInWithCredential(credential);
      //   },
      // ),
    );
  }

  // Verifikasi OTP yang dimasukkan user
  Future<UserCredential?> verifyOTP(String otp) async {
    if (_confirmationResult == null) return null;

    try {
      return await _confirmationResult!.confirm(otp);
    } catch (e) {
      print('OTP salah: $e');
      return null;
    }
  }
}

class LoginPage extends StatefulWidget {
  const LoginPage({super.key});

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _emailCtrl = TextEditingController();
  final _passwordCtrl = TextEditingController();
  final _authService = AuthService();
  bool _isLoading = false;

  Future<void> _handleLogin() async {
    setState(() => _isLoading = true);

    final result = await _authService.loginWithEmail(
      email: _emailCtrl.text.trim(),
      password: _passwordCtrl.text,
    );

    setState(() => _isLoading = false);

    if (result != null && mounted) {
      // AuthGate akan otomatis navigasi ke HomePage
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Login berhasil!')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Icon(Icons.lock_outline, size: 80, color: Colors.blue),
              const SizedBox(height: 24),
              const Text('Masuk ke Akun Anda',
                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold)),
              const SizedBox(height: 32),

              // Email Field
              TextField(
                controller: _emailCtrl,
                keyboardType: TextInputType.emailAddress,
                decoration: const InputDecoration(
                  labelText: 'Email',
                  prefixIcon: Icon(Icons.email_outlined),
                  border: OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 16),

              // Password Field
              TextField(
                controller: _passwordCtrl,
                obscureText: true,
                decoration: const InputDecoration(
                  labelText: 'Password',
                  prefixIcon: Icon(Icons.lock_outlined),
                  border: OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 24),

              // Login Button
              SizedBox(
                width: double.infinity,
                height: 48,
                child: FilledButton(
                  onPressed: _isLoading ? null : _handleLogin,
                  child: _isLoading
                      ? const CircularProgressIndicator(color: Colors.white)
                      : const Text('Masuk'),
                ),
              ),
              const SizedBox(height: 16),

              // Google Sign-In
              OutlinedButton.icon(
                onPressed: () => GoogleAuthService().signInWithGoogle(),
                icon: const Icon(Icons.g_mobiledata, size: 24),
                label: const Text('Masuk dengan Google'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

import 'package:cloud_firestore/cloud_firestore.dart';

class UserModel {
  final String uid;
  final String name;
  final String email;
  final int age;
  final DateTime createdAt;
  final String? avatarUrl;

  UserModel({
    required this.uid,
    required this.name,
    required this.email,
    required this.age,
    required this.createdAt,
    this.avatarUrl,
  });

  // Convert dari Firestore Document
  factory UserModel.fromFirestore(DocumentSnapshot doc) {
    final data = doc.data() as Map<String, dynamic>;
    return UserModel(
      uid: doc.id,
      name: data['name'] ?? '',
      email: data['email'] ?? '',
      age: data['age'] ?? 0,
      createdAt: (data['createdAt'] as Timestamp?)?.toDate() ?? DateTime.now(),
      avatarUrl: data['avatarUrl'],
    );
  }

  // Convert ke Map untuk disimpan ke Firestore
  Map<String, dynamic> toFirestore() {
    return {
      'name': name,
      'email': email,
      'age': age,
      'createdAt': FieldValue.serverTimestamp(),
      'avatarUrl': avatarUrl,
    };
  }
}

import 'package:cloud_firestore/cloud_firestore.dart';
import '../models/user_model.dart';

class FirestoreService {
  final FirebaseFirestore _db = FirebaseFirestore.instance;

  // ───────────── CREATE ─────────────
  Future<void> createUser(UserModel user) async {
    await _db.collection('users').doc(user.uid).set(user.toFirestore());
  }

  // ───────────── READ (Single) ─────────────
  Future<UserModel?> getUser(String uid) async {
    final doc = await _db.collection('users').doc(uid).get();
    if (doc.exists) {
      return UserModel.fromFirestore(doc);
    }
    return null;
  }

  // ───────────── READ (Real-time Stream) ─────────────
  Stream<UserModel?> userStream(String uid) {
    return _db.collection('users').doc(uid).snapshots().map(
      (doc) => doc.exists ? UserModel.fromFirestore(doc) : null,
    );
  }

  // ───────────── READ (List) ─────────────
  Future<List<UserModel>> getUsers({int limit = 20}) async {
    final snapshot = await _db
        .collection('users')
        .orderBy('createdAt', descending: true)
        .limit(limit)
        .get();

    return snapshot.docs
        .map((doc) => UserModel.fromFirestore(doc))
        .toList();
  }

  // ───────────── READ (Query) ─────────────
  Future<List<UserModel>> searchUsers(String query) async {
    final snapshot = await _db
        .collection('users')
        .where('name', isGreaterThanOrEqualTo: query)
        .where('name', isLessThanOrEqualTo: '$query\uf8ff')
        .get();

    return snapshot.docs
        .map((doc) => UserModel.fromFirestore(doc))
        .toList();
  }

  // ───────────── UPDATE ─────────────
  Future<void> updateUser(String uid, Map<String, dynamic> data) async {
    await _db.collection('users').doc(uid).update(data);
  }

  // Update dengan increment
  Future<void> incrementField(String uid, String field, int amount) async {
    await _db.collection('users').doc(uid).update({
      field: FieldValue.increment(amount),
    });
  }

  // ───────────── DELETE ─────────────
  Future<void> deleteUser(String uid) async {
    await _db.collection('users').doc(uid).delete();
  }

  // ───────────── BATCH OPERATIONS ─────────────
  Future<void> batchDelete(List<String> uids) async {
    final batch = _db.batch();
    for (final uid in uids) {
      final ref = _db.collection('users').doc(uid);
      batch.delete(ref);
    }
    await batch.commit();
  }

  // ───────────── TRANSACTIONS ─────────────
  Future<void> transferPoints(String fromId, String toId, int amount) async {
    await _db.runTransaction((transaction) async {
      final fromDoc = await transaction.get(_db.collection('users').doc(fromId));
      final toDoc = await transaction.get(_db.collection('users').doc(toId));

      if (!fromDoc.exists || !toDoc.exists) {
        throw Exception('User tidak ditemukan');
      }

      final fromData = fromDoc.data()!;
      final toData = toDoc.data()!;

      if ((fromData['points'] ?? 0) < amount) {
        throw Exception('Poin tidak cukup');
      }

      transaction.update(_db.collection('users').doc(fromId), {
        'points': FieldValue.increment(-amount),
      });

      transaction.update(_db.collection('users').doc(toId), {
        'points': FieldValue.increment(amount),
      });
    });
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Semua Users')),
      body: StreamBuilder<QuerySnapshot>(
        stream: FirebaseFirestore.instance
            .collection('users')
            .orderBy('createdAt', descending: true)
            .snapshots(),
        builder: (context, snapshot) {
          // Loading
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }

          // Error
          if (snapshot.hasError) {
            return Center(child: Text('Error: ${snapshot.error}'));
          }

          // Kosong
          final docs = snapshot.data?.docs ?? [];
          if (docs.isEmpty) {
            return const Center(child: Text('Belum ada user'));
          }

          // Tampilkan list
          return ListView.builder(
            itemCount: docs.length,
            itemBuilder: (context, index) {
              final user = UserModel.fromFirestore(docs[index]);
              return ListTile(
                leading: CircleAvatar(
                  child: Text(user.name[0].toUpperCase()),
                ),
                title: Text(user.name),
                subtitle: Text(user.email),
                trailing: Text('${user.age} th'),
              );
            },
          );
        },
      ),
    );
  }
}

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

class StorageService {
  final FirebaseStorage _storage = FirebaseStorage.instance;

  // Upload foto profil
  Future<String?> uploadProfilePhoto({
    required String uid,
    required File imageFile,
  }) async {
    try {
      // Buat path unik
      final ref = _storage.ref().child('profiles/$uid/avatar.jpg');

      // Upload file
      final uploadTask = await ref.putFile(
        imageFile,
        SettableMetadata(
          contentType: 'image/jpeg',
          customMetadata: {'uploadedBy': uid},
        ),
      );

      // Ambil URL download
      final downloadUrl = await uploadTask.ref.getDownloadURL();
      return downloadUrl;
    } catch (e) {
      print('Upload error: $e');
      return null;
    }
  }

  // Upload dengan progress tracking
  Stream<TaskSnapshot> uploadWithProgress({
    required String path,
    required File file,
    required String contentType,
  }) {
    final ref = _storage.ref().child(path);
    final uploadTask = ref.putFile(
      file,
      SettableMetadata(contentType: contentType),
    );
    return uploadTask.snapshotEvents;
  }

  // Upload gambar dari gallery
  Future<String?> uploadImageFromGallery({
    required String uid,
    required String postId,
  }) async {
    final picker = ImagePicker();
    final pickedFile = await picker.pickImage(
      source: ImageSource.gallery,
      maxWidth: 1080,
      maxHeight: 1080,
      imageQuality: 85,
    );

    if (pickedFile == null) return null;

    final file = File(pickedFile.path);
    final ext = pickedFile.path.split('.').last;
    final path = 'posts/$uid/${DateTime.now().millisecondsSinceEpoch}.$ext';

    final ref = _storage.ref().child(path);
    final uploadTask = await ref.putFile(file);
    return await uploadTask.ref.getDownloadURL();
  }

  // Download file
  Future<File?> downloadFile({
    required String url,
    required String savePath,
  }) async {
    try {
      final ref = _storage.refFromURL(url);
      final file = File(savePath);
      await ref.writeToFile(file);
      return file;
    } catch (e) {
      print('Download error: $e');
      return null;
    }
  }

  // Hapus file
  Future<void> deleteFile(String url) async {
    try {
      final ref = _storage.refFromURL(url);
      await ref.delete();
    } catch (e) {
      print('Delete error: $e');
    }
  }
}

class UploadImageWidget extends StatefulWidget {
  final String uid;
  const UploadImageWidget({super.key, required this.uid});

  @override
  State<UploadImageWidget> createState() => _UploadImageWidgetState();
}

class _UploadImageWidgetState extends State<UploadImageWidget> {
  final _storageService = StorageService();
  double _progress = 0;
  String? _downloadUrl;

  Future<void> _pickAndUpload() async {
    final picker = ImagePicker();
    final file = await picker.pickImage(source: ImageSource.gallery);

    if (file == null) return;

    final stream = _storageService.uploadWithProgress(
      path: 'profiles/${widget.uid}/photo.jpg',
      file: File(file.path),
      contentType: 'image/jpeg',
    );

    stream.listen(
      (TaskSnapshot snapshot) {
        setState(() {
          _progress = snapshot.bytesTransferred / snapshot.totalBytes;
        });
      },
      onDone: () async {
        final url = await snapshot.ref.getDownloadURL();
        setState(() {
          _downloadUrl = url;
          _progress = 1.0;
        });
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        // Preview gambar
        if (_downloadUrl != null)
          CircleAvatar(
            radius: 50,
            backgroundImage: NetworkImage(_downloadUrl!),
          )
        else
          const CircleAvatar(
            radius: 50,
            child: Icon(Icons.person, size: 50),
          ),

        const SizedBox(height: 8),

        // Progress bar
        if (_progress > 0 && _progress < 1)
          LinearProgressIndicator(value: _progress),

        const SizedBox(height: 8),

        FilledButton.icon(
          onPressed: _pickAndUpload,
          icon: const Icon(Icons.camera_alt),
          label: Text(_downloadUrl == null ? 'Pilih Foto' : 'Ganti Foto'),
        ),
      ],
    );
  }
}

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:firebase_auth/firebase_auth.dart';

class MessagingService {
  final FirebaseMessaging _messaging = FirebaseMessaging.instance;

  // Inisialisasi messaging
  Future<void> initialize() async {
    // 1. Minta permission (iOS & web)
    final settings = await _messaging.requestPermission(
      alert: true,
      badge: true,
      sound: true,
      provisional: false,
      criticalAlert: true,
    );

    print('Permission status: ${settings.authorizationStatus}');

    // 2. Ambil FCM token
    final token = await _messaging.getToken();
    print('FCM Token: $token');

    // 3. Simpan token ke Firestore (untuk targeting)
    if (token != null) {
      await _saveTokenToFirestore(token);
    }

    // 4. Listen token refresh
    _messaging.onTokenRefresh.listen(_saveTokenToFirestore);

    // 5. Handle message saat app terminated
    FirebaseMessaging.onMessageOpenedApp.listen(_handleMessage);

    // 6. Handle message foreground
    FirebaseMessaging.onMessage.listen(_handleForegroundMessage);

    // 7. Handle background message (harus di top-level function)
    FirebaseMessaging.onBackgroundMessage(_handleBackgroundMessage);
  }

  // Simpan token ke Firestore
  Future<void> _saveTokenToFirestore(String token) async {
    final uid = FirebaseAuth.instance.currentUser?.uid;
    if (uid == null) return;

    await FirebaseFirestore.instance.collection('users').doc(uid).update({
      'fcmTokens': FieldValue.arrayUnion([token]),
    });
  }

  // Handle message di foreground
  void _handleForegroundMessage(RemoteMessage message) {
    print('Foreground message: ${message.notification?.title}');

    // Tampilkan custom in-app notification
    // Bisa pakai flutter_local_notifications atau custom widget
    if (message.notification != null) {
      _showInAppNotification(
        title: message.notification!.title ?? '',
        body: message.notification!.body ?? '',
        data: message.data,
      );
    }
  }

  // Handle message saat app dibuka dari notifikasi
  void _handleMessage(RemoteMessage message) {
    final route = message.data['route'];
    if (route != null) {
      // Navigasi ke halaman tertentu
      // navigatorKey.currentState?.pushNamed(route);
    }
  }

  // Top-level function untuk background message
  static Future<void> _handleBackgroundMessage(
    RemoteMessage message
  ) async {
    // Pastikan Firebase sudah terinisialisasi
    await Firebase.initializeApp();
    print('Background message: ${message.notification?.title}');
  }

  void _showInAppNotification({
    required String title,
    required String body,
    required Map<String, dynamic> data,
  }) {
    // Implementasi in-app notification (banner/toast)
    print('In-App: $title - $body');
  }
}

// background_handler.dart
// HARUS di top-level function, bukan di dalam class atau method lain
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:firebase_core/firebase_core.dart';

@pragma('vm:entry-point')
Future<void> firebaseMessagingBackgroundHandler(
  RemoteMessage message
) async {
  // Inisialisasi Firebase untuk background isolate
  await Firebase.initializeApp();

  print('=== BACKGROUND MESSAGE ===');
  print('Title: ${message.notification?.title}');
  print('Body: ${message.notification?.body}');
  print('Data: ${message.data}');

  // Simpan message ke local storage atau lakukan sync
  // Gunakan WorkManager atau scheduled task untuk processing
}

// Di main.dart, register handler SEBELUM runApp():
// void main() async {
//   WidgetsFlutterBinding.ensureInitialized();
//   await Firebase.initializeApp(...);
//   FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);
//   runApp(MyApp());
// }

const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp();

// Trigger: saat dokumen baru ditambahkan ke collection "notifications"
exports.sendNewPostNotification = functions.firestore
    .document("posts/{postId}")
    .onCreate(async (snap, context) => {
      const postData = snap.data();
      const authorId = postData.authorId;

      // Ambil semua kecuali author
      const usersSnapshot = await admin.firestore()
          .collection("users")
          .where("__name__", "!=", authorId)
          .get();

      const tokens = [];
      usersSnapshot.forEach((doc) => {
        const fcmTokens = doc.data().fcmTokens || [];
        tokens.push(...fcmTokens);
      });

      if (tokens.length === 0) return null;

      // Kirim notifikasi via FCM
      const message = {
        notification: {
          title: "Post Baru! 🔔",
          body: `${postData.authorName} baru saja memposting: ${postData.title}`,
        },
        data: {
          route: "/post/${context.params.postId}",
          postId: context.params.postId,
        },
        tokens: tokens,
      };

      // Kirim ke semua token (batch)
      const response = await admin.messaging().sendEachForMulticast(message);

      // Bersihkan token yang sudah tidak valid
      const failedTokens = [];
      response.responses.forEach((resp, idx) => {
        if (!resp.success) {
          failedTokens.push(tokens[idx]);
        }
      });

      // Hapus token invalid dari Firestore
      if (failedTokens.length > 0) {
        const batch = admin.firestore().batch();
        usersSnapshot.forEach((doc) => {
          const userTokens = doc.data().fcmTokens || [];
          const validTokens = userTokens
              .filter((t) => !failedTokens.includes(t));
          batch.update(doc.ref, { fcmTokens: validTokens });
        });
        await batch.commit();
      }

      return response;
    });

// Trigger: saat ada komentar baru
exports.sendCommentNotification = functions.firestore
    .document("posts/{postId}/comments/{commentId}")
    .onCreate(async (snap, context) => {
      const commentData = snap.data();
      const postId = context.params.postId;

      // Ambil data post
      const postDoc = await admin.firestore()
          .collection("posts").doc(postId).get();
      const postData = postDoc.data();

      // Kirim ke pemilik post
      if (postData.authorId !== commentData.authorId) {
        const ownerDoc = await admin.firestore()
            .collection("users").doc(postData.authorId).get();
        const tokens = ownerDoc.data().fcmTokens || [];

        if (tokens.length > 0) {
          await admin.messaging().sendEachForMulticast({
            notification: {
              title: "Komentar Baru 💬",
              body: `${commentData.authorName}: ${commentData.text}`,
            },
            data: { route: "/post/${postId}" },
            tokens: tokens,
          });
        }
      }
    });

import 'package:cloud_functions/cloud_functions.dart';

class CloudFunctionService {
  // Panggil callable function
  Future<dynamic> callFunction({
    required String name,
    Map<String, dynamic>? params,
  }) async {
    try {
      final result = await FirebaseFunctions.instance
          .httpsCallable(name)
          .call(params ?? {});

      return result.data;
    } on FirebaseFunctionsException catch (e) {
      print('Cloud Function error: ${e.code} - ${e.message}');
      return null;
    }
  }

  // Contoh: generate custom token untuk admin
  Future<String?> getAdminToken(String uid) async {
    final result = await callFunction(
      name: 'getAdminToken',
      params: {'uid': uid},
    );
    return result?['token'];
  }

  // Contoh: proses data di server
  Future<Map<String, dynamic>?> processPayment({
    required String userId,
    required double amount,
    required String method,
  }) async {
    final result = await callFunction(
      name: 'processPayment',
      params: {
        'userId': userId,
        'amount': amount,
        'method': method,
      },
    );
    return Map<String, dynamic>.from(result ?? {});
  }
}

// functions/index.js
const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp();

// Callable function: buat custom claim
exports.setAdminClaim = functions.https.onCall(async (data, context) => {
  // Cek apakah caller adalah admin
  if (!context.auth) {
    throw new functions.https.HttpsError(
        "unauthenticated", "Harus login");
  }

  const callerDoc = await admin.firestore()
      .collection("users").doc(context.auth.uid).get();

  if (!callerDoc.data().isAdmin) {
    throw new functions.https.HttpsError(
        "permission-denied", "Bukan admin");
  }

  // Set custom claim ke target user
  const { uid } = data;
  await admin.auth().setCustomUserClaims(uid, { admin: true });

  // Force refresh token
  await admin.firestore().collection("users").doc(uid).update({
    admin: true,
    updatedAt: admin.firestore.FieldValue.serverTimestamp(),
  });

  return { success: true, message: `Admin claim ditambahkan ke ${uid}` };
});

// HTTP trigger: API endpoint
exports.apiGetUser = functions.https.onRequest(async (req, res) => {
  // CORS
  res.set("Access-Control-Allow-Origin", "*");

  if (req.method === "OPTIONS") {
    res.status(204).send("");
    return;
  }

  const uid = req.query.uid;
  if (!uid) {
    res.status(400).json({ error: "uid required" });
    return;
  }

  const userDoc = await admin.firestore()
      .collection("users").doc(uid).get();

  if (!userDoc.exists) {
    res.status(404).json({ error: "User not found" });
    return;
  }

  res.status(200).json(userDoc.data());
});

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:firebase_auth/firebase_auth.dart';

// ───── Auth Provider ─────
class AuthProvider extends ChangeNotifier {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  User? _user;
  bool _isLoading = true;

  User? get user => _user;
  bool get isLoading => _isLoading;
  bool get isLoggedIn => _user != null;

  AuthProvider() {
    // Listen perubahan auth state
    _auth.authStateChanges().listen((User? user) {
      _user = user;
      _isLoading = false;
      notifyListeners();
    });
  }

  Future<bool> login(String email, String password) async {
    try {
      await _auth.signInWithEmailAndPassword(
        email: email,
        password: password,
      );
      return true;
    } catch (e) {
      return false;
    }
  }

  Future<void> logout() async {
    await _auth.signOut();
  }
}

// ───── User Data Provider ─────
class UserDataProvider extends ChangeNotifier {
  final FirebaseFirestore _db = FirebaseFirestore.instance;
  UserModel? _userData;

  UserModel? get userData => _userData;

  void startListening(String uid) {
    _db.collection('users').doc(uid).snapshots().listen((doc) {
      if (doc.exists) {
        _userData = UserModel.fromFirestore(doc);
        notifyListeners();
      }
    });
  }
}

// ───── Main App dengan Provider ─────
void main() {
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => AuthProvider()),
        ChangeNotifierProvider(create: (_) => UserDataProvider()),
      ],
      child: const MyApp(),
    ),
  );
}

// ───── Abstract Repository ─────
abstract class UserRepository {
  Future<UserModel?> getUser(String uid);
  Stream<UserModel?> userStream(String uid);
  Future<void> updateUser(String uid, Map<String, dynamic> data);
}

// ───── Firestore Implementation ─────
class FirestoreUserRepository implements UserRepository {
  final FirebaseFirestore _db = FirebaseFirestore.instance;

  @override
  Future<UserModel?> getUser(String uid) async {
    final doc = await _db.collection('users').doc(uid).get();
    return doc.exists ? UserModel.fromFirestore(doc) : null;
  }

  @override
  Stream<UserModel?> userStream(String uid) {
    return _db.collection('users').doc(uid).snapshots().map(
      (doc) => doc.exists ? UserModel.fromFirestore(doc) : null,
    );
  }

  @override
  Future<void> updateUser(String uid, Map<String, dynamic> data) async {
    await _db.collection('users').doc(uid).update(data);
  }
}

// ───── Mock Implementation untuk Testing ─────
class MockUserRepository implements UserRepository {
  final Map<String, UserModel> _cache = {};

  @override
  Future<UserModel?> getUser(String uid) async {
    return _cache[uid];
  }

  @override
  Stream<UserModel?> userStream(String uid) async* {
    yield _cache[uid];
  }

  @override
  Future<void> updateUser(String uid, Map<String, dynamic> data) async {
    // Update mock data
  }
}

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {

    // Helper functions
    function isAuthenticated() {
      return request.auth != null;
    }

    function isOwner(userId) {
      return isAuthenticated() && request.auth.uid == userId;
    }

    function isAdmin() {
      return isAuthenticated() &&
        get(/databases/$(database)/documents/users/$(request.auth.uid)).data.isAdmin == true;
    }

    // ───── Users Collection ─────
    match /users/{userId} {
      // Bisa dibaca oleh semua user yang login
      allow read: if isAuthenticated();

      // Hanya admin atau owner yang bisa update
      allow update: if isAdmin() || isOwner(userId);

      // Hanya sistem yang bisa create (via Cloud Functions)
      allow create: if isAdmin();
      allow delete: if isAdmin();
    }

    // ───── Posts Collection ─────
    match /posts/{postId} {
      // Bisa dibaca semua yang login
      allow read: if isAuthenticated();

      // Create: harus login dan sebagai author
      allow create: if isAuthenticated() &&
        request.resource.data.authorId == request.auth.uid;

      // Update: hanya author
      allow update: if isAuthenticated() &&
        resource.data.authorId == request.auth.uid;

      // Delete: author atau admin
      allow delete: if isAuthenticated() &&
        (resource.data.authorId == request.auth.uid || isAdmin());

      // Subcollection: comments
      match /comments/{commentId} {
        allow read: if isAuthenticated();
        allow create: if isAuthenticated();
        allow update: if isAuthenticated() &&
          resource.data.authorId == request.auth.uid;
        allow delete: if isAuthenticated() &&
          (resource.data.authorId == request.auth.uid || isAdmin());
      }
    }
  }
}

rules_version = '2';
service firebase.storage {
  match /b/{bucket}/o {

    // Helper
    function isAuthenticated() {
      return request.auth != null;
    }

    function isOwner(userId) {
      return isAuthenticated() && request.auth.uid == userId;
    }

    // ───── Profile Photos ─────
    match /profiles/{userId}/{allPaths=**} {
      // Semua orang yang login bisa lihat foto profil
      allow read: if isAuthenticated();

      // Hanya owner yang bisa upload/ganti
      allow write: if isOwner(userId) &&
        request.resource.size < 5 * 1024 * 1024 && // Max 5MB
        request.resource.contentType.matches('image/.*'); // Image only
    }

    // ───── Post Images ─────
    match /posts/{userId}/{allPaths=**} {
      allow read: if isAuthenticated();
      allow write: if isOwner(userId) &&
        request.resource.size < 10 * 1024 * 1024 && // Max 10MB
        request.resource.contentType.matches('image/.*');
    }

    // ───── General uploads ─────
    match /uploads/{userId}/{allPaths=**} {
      allow read: if isAuthenticated();
      allow write: if isOwner(userId) &&
        request.resource.size < 20 * 1024 * 1024; // Max 20MB
    }
  }
}

# Deploy Cloud Functions
cd functions
npm install
cd ..
firebase deploy --only functions

# Deploy Security Rules
firebase deploy --only firestore:rules
firebase deploy --only storage:rules

# Deploy Semuanya
firebase deploy

# Test functions lokal
firebase emulators:start

import 'package:flutter/foundation.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  // Gunakan emulator di development
  if (kDebugMode) {
    FirebaseFirestore.instance.useFirestoreEmulator('localhost', 8080);
    // FirebaseAuth.instance.useAuthEmulator('localhost', 9099);
    // FirebaseStorage.instance.useStorageEmulator('localhost', 9199);
  }

  runApp(const MyApp());
}

import 'package:firebase_crashlytics/firebase_crashlytics.dart';
import 'package:firebase_analytics/firebase_analytics.dart';

class MonitoringService {
  static final FirebaseAnalytics _analytics = FirebaseAnalytics.instance;

  // Inisialisasi Crashlytics
  static Future<void> initialize() async {
    // Catch semua errors yang tidak tertangkap
    FlutterError.onError = (errorDetails) {
      FirebaseCrashlytics.instance.recordFlutterFatalError(errorDetails);
    };

    // Catch errors di isolate
    PlatformDispatcher.instance.onError = (error, stack) {
      FirebaseCrashlytics.instance.recordError(error, stack, fatal: true);
      return true;
    };

    // Log analytic event: app open
    await _analytics.logAppOpen();
  }

  // Log custom event
  static Future<void> logEvent({
    required String name,
    Map<String, dynamic>? parameters,
  }) async {
    await _analytics.logEvent(
      name: name,
      parameters: parameters,
    );
  }

  // Log screen view
  static Future<void> logScreenView(String screenName) async {
    await _analytics.logScreenView(screenName: screenName);
  }

  // Log error ke Crashlytics
  static Future<void> logError(
    dynamic error,
    StackTrace stack, {
    String? reason,
  }) async {
    await FirebaseCrashlytics.instance.recordError(
      error,
      stack,
      reason: reason,
      fatal: false,
    );
  }

  // Set user identifier (membantu debugging)
  static void setUserId(String uid) {
    FirebaseCrashlytics.instance.setUserIdentifier(uid);
    _analytics.setUserID(id: uid);
  }
}

// Contoh penggunaan:
// MonitoringService.logEvent(name: 'purchase', parameters: {
//   'item_id': 'SKU_123',
//   'price': 49.99,
//   'currency': 'IDR',
// });