import 'package:hive_flutter/hive_flutter.dart';
import 'package:lunchpick/domain/entities/restaurant.dart';
import 'package:lunchpick/domain/repositories/restaurant_repository.dart';
import 'package:lunchpick/core/utils/distance_calculator.dart';
import 'package:lunchpick/data/datasources/remote/naver_search_service.dart';
import 'package:lunchpick/data/datasources/remote/naver_map_parser.dart';
import 'package:lunchpick/core/constants/api_keys.dart';

class RestaurantRepositoryImpl implements RestaurantRepository {
  static const String _boxName = 'restaurants';
  final NaverSearchService _naverSearchService;
  
  RestaurantRepositoryImpl({
    NaverSearchService? naverSearchService,
  }) : _naverSearchService = naverSearchService ?? NaverSearchService();
  
  Future<Box<Restaurant>> get _box async => 
      await Hive.openBox<Restaurant>(_boxName);

  @override
  Future<List<Restaurant>> getAllRestaurants() async {
    final box = await _box;
    return box.values.toList();
  }

  @override
  Future<Restaurant?> getRestaurantById(String id) async {
    final box = await _box;
    return box.get(id);
  }

  @override
  Future<void> addRestaurant(Restaurant restaurant) async {
    final box = await _box;
    await box.put(restaurant.id, restaurant);
  }

  @override
  Future<void> updateRestaurant(Restaurant restaurant) async {
    final box = await _box;
    await box.put(restaurant.id, restaurant);
  }

  @override
  Future<void> deleteRestaurant(String id) async {
    final box = await _box;
    await box.delete(id);
  }

  @override
  Future<List<Restaurant>> getRestaurantsByCategory(String category) async {
    final restaurants = await getAllRestaurants();
    return restaurants.where((r) => r.category == category).toList();
  }

  @override
  Future<List<String>> getAllCategories() async {
    final restaurants = await getAllRestaurants();
    final categories = restaurants.map((r) => r.category).toSet().toList();
    categories.sort();
    return categories;
  }

  @override
  Stream<List<Restaurant>> watchRestaurants() async* {
    final box = await _box;
    yield box.values.toList();
    yield* box.watch().map((_) => box.values.toList());
  }

  @override
  Future<void> updateLastVisitDate(String restaurantId, DateTime visitDate) async {
    final restaurant = await getRestaurantById(restaurantId);
    if (restaurant != null) {
      final updatedRestaurant = 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: visitDate,
        source: restaurant.source,
        createdAt: restaurant.createdAt,
        updatedAt: DateTime.now(),
        naverPlaceId: restaurant.naverPlaceId,
        naverUrl: restaurant.naverUrl,
        businessHours: restaurant.businessHours,
        lastVisited: visitDate,
        visitCount: restaurant.visitCount + 1,
      );
      await updateRestaurant(updatedRestaurant);
    }
  }

  @override
  Future<List<Restaurant>> getRestaurantsWithinDistance({
    required double userLatitude,
    required double userLongitude,
    required double maxDistanceInMeters,
  }) async {
    final restaurants = await getAllRestaurants();
    return restaurants.where((restaurant) {
      final distanceInKm = DistanceCalculator.calculateDistance(
        lat1: userLatitude,
        lon1: userLongitude,
        lat2: restaurant.latitude,
        lon2: restaurant.longitude,
      );
      final distanceInMeters = distanceInKm * 1000;
      return distanceInMeters <= maxDistanceInMeters;
    }).toList();
  }

  @override
  Future<List<Restaurant>> getRestaurantsNotVisitedInDays(int days) async {
    final restaurants = await getAllRestaurants();
    final cutoffDate = DateTime.now().subtract(Duration(days: days));
    
    return restaurants.where((restaurant) {
      if (restaurant.lastVisitDate == null) return true;
      return restaurant.lastVisitDate!.isBefore(cutoffDate);
    }).toList();
  }

  @override
  Future<List<Restaurant>> searchRestaurants(String query) async {
    if (query.isEmpty) {
      return await getAllRestaurants();
    }
    
    final restaurants = await getAllRestaurants();
    final lowercaseQuery = query.toLowerCase();
    
    return restaurants.where((restaurant) {
      return restaurant.name.toLowerCase().contains(lowercaseQuery) ||
          (restaurant.description?.toLowerCase().contains(lowercaseQuery) ?? false) ||
          restaurant.category.toLowerCase().contains(lowercaseQuery) ||
          restaurant.roadAddress.toLowerCase().contains(lowercaseQuery);
    }).toList();
  }

  @override
  Future<Restaurant> addRestaurantFromUrl(String url) async {
    try {
      // URL 유효성 검증
      if (!url.contains('naver.com') && !url.contains('naver.me')) {
        throw Exception('유효하지 않은 네이버 지도 URL입니다.');
      }
      
      // NaverSearchService로 식당 정보 추출
      Restaurant restaurant = await _naverSearchService.getRestaurantFromUrl(url);
      
      // API 키가 설정되어 있으면 추가 정보 검색
      if (ApiKeys.areKeysConfigured() && restaurant.name != '네이버 지도 장소') {
        try {
          final detailedRestaurant = await _naverSearchService.searchRestaurantDetails(
            name: restaurant.name,
            address: restaurant.roadAddress,
            latitude: restaurant.latitude,
            longitude: restaurant.longitude,
          );
          
          if (detailedRestaurant != null) {
            // 기존 정보와 API 검색 결과 병합
            restaurant = Restaurant(
              id: restaurant.id,
              name: restaurant.name,
              category: detailedRestaurant.category,
              subCategory: detailedRestaurant.subCategory,
              description: detailedRestaurant.description ?? restaurant.description,
              phoneNumber: detailedRestaurant.phoneNumber ?? restaurant.phoneNumber,
              roadAddress: detailedRestaurant.roadAddress,
              jibunAddress: detailedRestaurant.jibunAddress,
              latitude: detailedRestaurant.latitude,
              longitude: detailedRestaurant.longitude,
              lastVisitDate: restaurant.lastVisitDate,
              source: DataSource.NAVER,
              createdAt: restaurant.createdAt,
              updatedAt: DateTime.now(),
              naverPlaceId: restaurant.naverPlaceId,
              naverUrl: restaurant.naverUrl,
              businessHours: detailedRestaurant.businessHours ?? restaurant.businessHours,
              lastVisited: restaurant.lastVisited,
              visitCount: restaurant.visitCount,
            );
          }
        } catch (e) {
          print('API 검색 실패, 스크래핑된 정보만 사용: $e');
        }
      }
      
      // 중복 체크 개선
      final restaurants = await getAllRestaurants();
      
      // 1. 주소 기반 중복 체크
      if (restaurant.roadAddress.isNotEmpty || restaurant.jibunAddress.isNotEmpty) {
        final addressDuplicate = restaurants.firstWhere(
          (r) => r.name == restaurant.name && 
                 (r.roadAddress == restaurant.roadAddress || 
                  r.jibunAddress == restaurant.jibunAddress),
          orElse: () => Restaurant(
            id: '',
            name: '',
            category: '',
            subCategory: '',
            roadAddress: '',
            jibunAddress: '',
            latitude: 0,
            longitude: 0,
            source: DataSource.USER_INPUT,
            createdAt: DateTime.now(),
            updatedAt: DateTime.now(),
          ),
        );
        
        if (addressDuplicate.id.isNotEmpty) {
          throw Exception('동일한 이름과 주소의 맛집이 이미 존재합니다: ${addressDuplicate.name}');
        }
      }
      
      // 2. 위치 기반 중복 체크 (50m 이내 같은 이름)
      final locationDuplicate = restaurants.firstWhere(
        (r) {
          if (r.name != restaurant.name) return false;
          
          final distanceInKm = DistanceCalculator.calculateDistance(
            lat1: r.latitude,
            lon1: r.longitude,
            lat2: restaurant.latitude,
            lon2: restaurant.longitude,
          );
          final distanceInMeters = distanceInKm * 1000;
          return distanceInMeters < 50; // 50m 이내
        },
        orElse: () => Restaurant(
          id: '',
          name: '',
          category: '',
          subCategory: '',
          roadAddress: '',
          jibunAddress: '',
          latitude: 0,
          longitude: 0,
          source: DataSource.USER_INPUT,
          createdAt: DateTime.now(),
          updatedAt: DateTime.now(),
        ),
      );
      
      if (locationDuplicate.id.isNotEmpty) {
        throw Exception('50m 이내에 동일한 이름의 맛집이 이미 존재합니다: ${locationDuplicate.name}');
      }
      
      // 새 맛집 추가
      await addRestaurant(restaurant);
      
      return restaurant;
    } catch (e) {
      if (e is NaverMapParseException) {
        throw Exception('네이버 지도 파싱 실패: ${e.message}');
      }
      rethrow;
    }
  }

  @override
  Future<Restaurant?> getRestaurantByNaverPlaceId(String naverPlaceId) async {
    final restaurants = await getAllRestaurants();
    try {
      return restaurants.firstWhere(
        (r) => r.naverPlaceId == naverPlaceId,
      );
    } catch (e) {
      return null;
    }
  }

}