import 'package:hive_flutter/hive_flutter.dart';
import 'package:lunchpick/domain/entities/visit_record.dart';
import 'package:lunchpick/domain/repositories/visit_repository.dart';

class VisitRepositoryImpl implements VisitRepository {
  static const String _boxName = 'visit_records';
  
  Future<Box<VisitRecord>> get _box async => 
      await Hive.openBox<VisitRecord>(_boxName);

  @override
  Future<List<VisitRecord>> getAllVisitRecords() async {
    final box = await _box;
    final records = box.values.toList();
    records.sort((a, b) => b.visitDate.compareTo(a.visitDate));
    return records;
  }

  @override
  Future<List<VisitRecord>> getVisitRecordsByRestaurantId(String restaurantId) async {
    final records = await getAllVisitRecords();
    return records.where((r) => r.restaurantId == restaurantId).toList();
  }

  @override
  Future<List<VisitRecord>> getVisitRecordsByDate(DateTime date) async {
    final records = await getAllVisitRecords();
    return records.where((record) {
      return record.visitDate.year == date.year &&
          record.visitDate.month == date.month &&
          record.visitDate.day == date.day;
    }).toList();
  }

  @override
  Future<List<VisitRecord>> getVisitRecordsByDateRange({
    required DateTime startDate,
    required DateTime endDate,
  }) async {
    final records = await getAllVisitRecords();
    return records.where((record) {
      return record.visitDate.isAfter(startDate.subtract(const Duration(days: 1))) &&
          record.visitDate.isBefore(endDate.add(const Duration(days: 1)));
    }).toList();
  }

  @override
  Future<void> addVisitRecord(VisitRecord visitRecord) async {
    final box = await _box;
    await box.put(visitRecord.id, visitRecord);
  }

  @override
  Future<void> updateVisitRecord(VisitRecord visitRecord) async {
    final box = await _box;
    await box.put(visitRecord.id, visitRecord);
  }

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

  @override
  Future<void> confirmVisit(String visitRecordId) async {
    final box = await _box;
    final record = box.get(visitRecordId);
    if (record != null) {
      final updatedRecord = VisitRecord(
        id: record.id,
        restaurantId: record.restaurantId,
        visitDate: record.visitDate,
        isConfirmed: true,
        createdAt: record.createdAt,
      );
      await updateVisitRecord(updatedRecord);
    }
  }

  @override
  Stream<List<VisitRecord>> watchVisitRecords() async* {
    final box = await _box;
    try {
      yield await getAllVisitRecords();
    } catch (_) {
      yield <VisitRecord>[];
    }
    yield* box.watch().asyncMap((_) async => await getAllVisitRecords());
  }

  @override
  Future<DateTime?> getLastVisitDate(String restaurantId) async {
    final records = await getVisitRecordsByRestaurantId(restaurantId);
    if (records.isEmpty) return null;
    
    // 이미 visitDate 기준으로 정렬되어 있으므로 첫 번째가 가장 최근
    return records.first.visitDate;
  }

  @override
  Future<Map<String, int>> getMonthlyVisitStats(int year, int month) async {
    final startDate = DateTime(year, month, 1);
    final endDate = DateTime(year, month + 1, 0); // 해당 월의 마지막 날
    
    final records = await getVisitRecordsByDateRange(
      startDate: startDate,
      endDate: endDate,
    );

    final stats = <String, int>{};
    for (final record in records) {
      final dayKey = record.visitDate.day.toString();
      stats[dayKey] = (stats[dayKey] ?? 0) + 1;
    }
    
    return stats;
  }

  @override
  Future<Map<String, int>> getCategoryVisitStats() async {
    // 이 메서드는 RestaurantRepository와 연동이 필요하므로
    // 실제 구현은 UseCase나 Provider 레벨에서 처리
    // 여기서는 빈 Map 반환
    return {};
  }
}