import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../core/firebase/firebase_providers.dart';

/// Anmeldung, Registrierung und der Haushalts-Bootstrap.
class AuthRepository {
  AuthRepository(this._auth, this._firestore);

  final FirebaseAuth _auth;
  final FirebaseFirestore _firestore;

  Future<void> signIn({required String email, required String password}) async {
    await _auth.signInWithEmailAndPassword(email: email, password: password);
  }

  /// Registrierung: legt Nutzer, persönliches Profil-Dokument und einen
  /// neuen Haushalt in einem Rutsch an. Der Nutzer ist automatisch Mitglied
  /// seines eigenen Haushalts (V2 fügt per Einladung weitere hinzu).
  Future<void> signUp({required String email, required String password}) async {
    final credential = await _auth.createUserWithEmailAndPassword(
      email: email,
      password: password,
    );
    final uid = credential.user!.uid;

    final householdRef = _firestore.collection('households').doc();
    final userRef = _firestore.collection('users').doc(uid);
    final batch = _firestore.batch();
    batch.set(householdRef, {
      'name': 'Mein Haushalt',
      'memberUids': [uid],
      'createdAt': FieldValue.serverTimestamp(),
    });
    batch.set(userRef, {
      'email': email,
      'householdId': householdRef.id,
      'createdAt': FieldValue.serverTimestamp(),
    });
    await batch.commit();
  }

  Future<void> signOut() => _auth.signOut();
}

final authRepositoryProvider = Provider<AuthRepository>((ref) {
  return AuthRepository(
    ref.watch(firebaseAuthProvider),
    ref.watch(firestoreProvider),
  );
});