Firebase وFirestore

flutter pub add firebase_core cloud_firestore firebase_auth

import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart'; // يُولَّد تلقائيًا بأداة flutterfire configure

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
  runApp(MyApp());
}

import 'package:cloud_firestore/cloud_firestore.dart';

Future<void> addTask(String title) async {
  await FirebaseFirestore.instance.collection('tasks').add({
    'title': title,
    'done': false,
    'createdAt': FieldValue.serverTimestamp(),
  });
}

StreamBuilder<QuerySnapshot>(
  stream: FirebaseFirestore.instance
      .collection('tasks')
      .orderBy('createdAt', descending: true)
      .snapshots(), // .snapshots() تدفّق مستمر، لا get() لمرة واحدة
  builder: (context, snapshot) {
    if (!snapshot.hasData) return CircularProgressIndicator();

    final docs = snapshot.data!.docs;
    return ListView.builder(
      itemCount: docs.length,
      itemBuilder: (context, i) {
        final data = docs[i].data() as Map<String, dynamic>;
        return CheckboxListTile(
          title: Text(data['title']),
          value: data['done'],
          onChanged: (v) => docs[i].reference.update({'done': v}),
        );
      },
    );
  },
)

import 'package:firebase_auth/firebase_auth.dart';

Future<User?> signUp(String email, String password) async {
  try {
    final credential = await FirebaseAuth.instance
        .createUserWithEmailAndPassword(email: email, password: password);
    return credential.user;
  } on FirebaseAuthException catch (e) {
    print('خطأ تسجيل: ${e.message}');
    return null;
  }
}

// مراقبة حالة تسجيل الدخول بأي وقت
StreamBuilder<User?>(
  stream: FirebaseAuth.instance.authStateChanges(),
  builder: (context, snapshot) {
    if (snapshot.hasData) return HomeScreen();
    return LoginScreen();
  },
)

final tasksRef = FirebaseFirestore.instance.collection('tasks');

await tasksRef.add({'title': 'مهمة جديدة'});           // إنشاء
await tasksRef.doc(id).update({'done': true});          // تعديل
await tasksRef.doc(id).delete();                        // حذف
final snapshot = await tasksRef.doc(id).get();           // قراءة مرة واحدة