import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:lunchpick/domain/entities/restaurant.dart';
import 'package:lunchpick/domain/repositories/restaurant_repository.dart';
import 'package:lunchpick/presentation/providers/di_providers.dart';
import 'package:uuid/uuid.dart';

/// 맛집 목록 Provider
final restaurantListProvider = StreamProvider<List<Restaurant>>((ref) {
  final repository = ref.watch(restaurantRepositoryProvider);
  return repository.watchRestaurants();
});

/// 특정 맛집 Provider
final restaurantProvider = FutureProvider.family<Restaurant?, String>((ref, id) async {
  final repository = ref.watch(restaurantRepositoryProvider);
  return repository.getRestaurantById(id);
});

/// 카테고리 목록 Provider
final categoriesProvider = FutureProvider<List<String>>((ref) async {
  final repository = ref.watch(restaurantRepositoryProvider);
  return repository.getAllCategories();
});

/// 맛집 관리 StateNotifier
class RestaurantNotifier extends StateNotifier<AsyncValue<void>> {
  final RestaurantRepository _repository;

  RestaurantNotifier(this._repository) : super(const AsyncValue.data(null));

  /// 맛집 추가
  Future<void> addRestaurant({
    required String name,
    required String category,
    required String subCategory,
    String? description,
    String? phoneNumber,
    required String roadAddress,
    required String jibunAddress,
    required double latitude,
    required double longitude,
    required DataSource source,
  }) async {
    state = const AsyncValue.loading();
    
    try {
      final restaurant = Restaurant(
        id: const Uuid().v4(),
        name: name,
        category: category,
        subCategory: subCategory,
        description: description,
        phoneNumber: phoneNumber,
        roadAddress: roadAddress,
        jibunAddress: jibunAddress,
        latitude: latitude,
        longitude: longitude,
        source: source,
        createdAt: DateTime.now(),
        updatedAt: DateTime.now(),
      );

      await _repository.addRestaurant(restaurant);
      state = const AsyncValue.data(null);
    } catch (e, stack) {
      state = AsyncValue.error(e, stack);
    }
  }

  /// 맛집 수정
  Future<void> updateRestaurant(Restaurant restaurant) async {
    state = const AsyncValue.loading();
    
    try {
      final updated = Restaurant(
        id: restaurant.id,
        name: restaurant.name,
        category: restaurant.category,
        subCategory: restaurant.subCategory,
        description: restaurant.description,
        phoneNumber: restaurant.phoneNumber,
        roadAddress: restaurant.roadAddress,
        jibunAddress: restaurant.jibunAddress,
        latitude: restaurant.latitude,
        longitude: restaurant.longitude,
        lastVisitDate: restaurant.lastVisitDate,
        source: restaurant.source,
        createdAt: restaurant.createdAt,
        updatedAt: DateTime.now(),
      );

      await _repository.updateRestaurant(updated);
      state = const AsyncValue.data(null);
    } catch (e, stack) {
      state = AsyncValue.error(e, stack);
    }
  }

  /// 맛집 삭제
  Future<void> deleteRestaurant(String id) async {
    state = const AsyncValue.loading();
    
    try {
      await _repository.deleteRestaurant(id);
      state = const AsyncValue.data(null);
    } catch (e, stack) {
      state = AsyncValue.error(e, stack);
    }
  }

  /// 마지막 방문일 업데이트
  Future<void> updateLastVisitDate(String restaurantId, DateTime visitDate) async {
    try {
      await _repository.updateLastVisitDate(restaurantId, visitDate);
    } catch (e, stack) {
      state = AsyncValue.error(e, stack);
    }
  }

  /// 네이버 지도 URL로부터 맛집 추가
  Future<Restaurant> addRestaurantFromUrl(String url) async {
    state = const AsyncValue.loading();
    
    try {
      final restaurant = await _repository.addRestaurantFromUrl(url);
      state = const AsyncValue.data(null);
      return restaurant;
    } catch (e, stack) {
      state = AsyncValue.error(e, stack);
      rethrow;
    }
  }

  /// 미리 생성된 Restaurant 객체를 직접 추가
  Future<void> addRestaurantDirect(Restaurant restaurant) async {
    state = const AsyncValue.loading();
    
    try {
      await _repository.addRestaurant(restaurant);
      state = const AsyncValue.data(null);
    } catch (e, stack) {
      state = AsyncValue.error(e, stack);
      rethrow;
    }
  }
}

/// RestaurantNotifier Provider
final restaurantNotifierProvider = StateNotifierProvider<RestaurantNotifier, AsyncValue<void>>((ref) {
  final repository = ref.watch(restaurantRepositoryProvider);
  return RestaurantNotifier(repository);
});

/// 거리 내 맛집 Provider
final restaurantsWithinDistanceProvider = FutureProvider.family<List<Restaurant>, ({double latitude, double longitude, double maxDistance})>((ref, params) async {
  final repository = ref.watch(restaurantRepositoryProvider);
  return repository.getRestaurantsWithinDistance(
    userLatitude: params.latitude,
    userLongitude: params.longitude,
    maxDistanceInMeters: params.maxDistance,
  );
});

/// n일 이내 방문하지 않은 맛집 Provider
final restaurantsNotVisitedInDaysProvider = FutureProvider.family<List<Restaurant>, int>((ref, days) async {
  final repository = ref.watch(restaurantRepositoryProvider);
  return repository.getRestaurantsNotVisitedInDays(days);
});

/// 검색어로 맛집 검색 Provider
final searchRestaurantsProvider = FutureProvider.family<List<Restaurant>, String>((ref, query) async {
  final repository = ref.watch(restaurantRepositoryProvider);
  return repository.searchRestaurants(query);
});

/// 카테고리별 맛집 Provider
final restaurantsByCategoryProvider = FutureProvider.family<List<Restaurant>, String>((ref, category) async {
  final repository = ref.watch(restaurantRepositoryProvider);
  return repository.getRestaurantsByCategory(category);
});

/// 검색 쿼리 상태 Provider
final searchQueryProvider = StateProvider<String>((ref) => '');

/// 선택된 카테고리 상태 Provider
final selectedCategoryProvider = StateProvider<String?>((ref) => null);

/// 필터링된 맛집 목록 Provider (검색 + 카테고리)
final filteredRestaurantsProvider = StreamProvider<List<Restaurant>>((ref) async* {
  final searchQuery = ref.watch(searchQueryProvider);
  final selectedCategory = ref.watch(selectedCategoryProvider);
  final restaurantsStream = ref.watch(restaurantListProvider.stream);
  
  await for (final restaurants in restaurantsStream) {
    var filtered = restaurants;
    
    // 검색 필터 적용
    if (searchQuery.isNotEmpty) {
      final lowercaseQuery = searchQuery.toLowerCase();
      filtered = filtered.where((restaurant) {
        return restaurant.name.toLowerCase().contains(lowercaseQuery) ||
            (restaurant.description?.toLowerCase().contains(lowercaseQuery) ?? false) ||
            restaurant.category.toLowerCase().contains(lowercaseQuery);
      }).toList();
    }
    
    // 카테고리 필터 적용
    if (selectedCategory != null) {
      filtered = filtered.where((restaurant) {
        return restaurant.category == selectedCategory;
      }).toList();
    }
    
    yield filtered;
  }
});