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

import '../../../core/firebase/firebase_providers.dart';
import '../../household/data/household_providers.dart';
import '../domain/plant_location.dart';

/// Firestore-Anbindung der Stellplätze:
/// households/{householdId}/locations/{locationId}

/// Alle Stellplätze des Haushalts, live aus Firestore.
final locationsProvider = StreamProvider<List<PlantLocation>>((ref) {
  final householdId = ref.watch(householdIdProvider).value;
  if (householdId == null) return Stream.value(const []);

  return ref
      .watch(firestoreProvider)
      .collection('households')
      .doc(householdId)
      .collection('locations')
      .orderBy('name')
      .snapshots()
      .map((snapshot) => [
            for (final doc in snapshot.docs)
              PlantLocation(id: doc.id, name: doc.data()['name'] as String? ?? ''),
          ]);
});

final locationByIdProvider =
    Provider.family<PlantLocation?, String?>((ref, id) {
  if (id == null) return null;
  final locations = ref.watch(locationsProvider).value ?? const [];
  for (final location in locations) {
    if (location.id == id) return location;
  }
  return null;
});

class LocationRepository {
  LocationRepository(this._firestore, this._householdIdGetter);

  final FirebaseFirestore _firestore;
  final String? Function() _householdIdGetter;

  Future<void> addLocation(String name) {
    final householdId = _householdIdGetter();
    if (householdId == null) {
      throw StateError('Kein Haushalt geladen – Aktion nicht möglich.');
    }
    return _firestore
        .collection('households')
        .doc(householdId)
        .collection('locations')
        .add({'name': name});
  }
}

final locationRepositoryProvider = Provider<LocationRepository>((ref) {
  return LocationRepository(
    ref.watch(firestoreProvider),
    () => ref.read(householdIdProvider).value,
  );
});