import 'package:flutter/material.dart';
import '../services/sms_scanner.dart';
import '../models/subscription.dart';
import '../services/sms_scan/subscription_converter.dart';
import '../services/sms_scan/subscription_filter.dart';
import '../providers/subscription_provider.dart';
import 'package:provider/provider.dart';
import '../utils/logger.dart';
import '../providers/navigation_provider.dart';
import '../providers/category_provider.dart';
import '../l10n/app_localizations.dart';

class SmsScanController extends ChangeNotifier {
  // 상태 관리
  bool _isLoading = false;
  bool get isLoading => _isLoading;

  String? _errorMessage;
  String? get errorMessage => _errorMessage;

  List<Subscription> _scannedSubscriptions = [];
  List<Subscription> get scannedSubscriptions => _scannedSubscriptions;

  int _currentIndex = 0;
  int get currentIndex => _currentIndex;

  String? _selectedCategoryId;
  String? get selectedCategoryId => _selectedCategoryId;

  final TextEditingController websiteUrlController = TextEditingController();

  // 의존성
  final SmsScanner _smsScanner = SmsScanner();
  final SubscriptionConverter _converter = SubscriptionConverter();
  final SubscriptionFilter _filter = SubscriptionFilter();

  @override
  void dispose() {
    websiteUrlController.dispose();
    super.dispose();
  }

  void setSelectedCategoryId(String? categoryId) {
    _selectedCategoryId = categoryId;
    notifyListeners();
  }

  void resetWebsiteUrl() {
    websiteUrlController.text = '';
  }

  Future<void> scanSms(BuildContext context) async {
    _isLoading = true;
    _errorMessage = null;
    _scannedSubscriptions = [];
    _currentIndex = 0;
    notifyListeners();

    try {
      // SMS 스캔 실행
      Log.i('SMS 스캔 시작');
      final scannedSubscriptionModels =
          await _smsScanner.scanForSubscriptions();
      Log.d('스캔된 구독: ${scannedSubscriptionModels.length}개');

      if (scannedSubscriptionModels.isNotEmpty) {
        Log.d(
            '첫 번째 구독: ${scannedSubscriptionModels[0].serviceName}, 반복 횟수: ${scannedSubscriptionModels[0].repeatCount}');
      }

      if (!context.mounted) return;

      if (scannedSubscriptionModels.isEmpty) {
        Log.i('스캔된 구독이 없음');
        _errorMessage = AppLocalizations.of(context).subscriptionNotFound;
        _isLoading = false;
        notifyListeners();
        return;
      }

      // SubscriptionModel을 Subscription으로 변환
      final scannedSubscriptions =
          _converter.convertModelsToSubscriptions(scannedSubscriptionModels);

      // 2회 이상 반복 결제된 구독만 필터링
      final repeatSubscriptions =
          _filter.filterByRepeatCount(scannedSubscriptions, 2);
      Log.d('반복 결제된 구독: ${repeatSubscriptions.length}개');

      if (repeatSubscriptions.isNotEmpty) {
        Log.d(
            '첫 번째 반복 구독: ${repeatSubscriptions[0].serviceName}, 반복 횟수: ${repeatSubscriptions[0].repeatCount}');
      }

      if (repeatSubscriptions.isEmpty) {
        Log.i('반복 결제된 구독이 없음');
        _errorMessage = AppLocalizations.of(context).repeatSubscriptionNotFound;
        _isLoading = false;
        notifyListeners();
        return;
      }

      // 구독 목록 가져오기
      final provider =
          Provider.of<SubscriptionProvider>(context, listen: false);
      final existingSubscriptions = provider.subscriptions;
      Log.d('기존 구독: ${existingSubscriptions.length}개');

      // 중복 구독 필터링
      final filteredSubscriptions =
          _filter.filterDuplicates(repeatSubscriptions, existingSubscriptions);
      Log.d('중복 제거 후 구독: ${filteredSubscriptions.length}개');

      if (filteredSubscriptions.isNotEmpty) {
        Log.d(
            '첫 번째 필터링된 구독: ${filteredSubscriptions[0].serviceName}, 반복 횟수: ${filteredSubscriptions[0].repeatCount}');
      }

      // 중복 제거 후 신규 구독이 없는 경우
      if (filteredSubscriptions.isEmpty) {
        Log.i('중복 제거 후 신규 구독이 없음');
        _isLoading = false;
        notifyListeners();
        return;
      }

      _scannedSubscriptions = filteredSubscriptions;
      _isLoading = false;
      websiteUrlController.text = ''; // URL 입력 필드 초기화
      notifyListeners();
    } catch (e) {
      Log.e('SMS 스캔 중 오류 발생', e);
      if (context.mounted) {
        _errorMessage =
            AppLocalizations.of(context).smsScanErrorWithMessage(e.toString());
        _isLoading = false;
        notifyListeners();
      }
    }
  }

  Future<void> addCurrentSubscription(BuildContext context) async {
    if (_currentIndex >= _scannedSubscriptions.length) return;

    final subscription = _scannedSubscriptions[_currentIndex];

    try {
      final provider =
          Provider.of<SubscriptionProvider>(context, listen: false);
      final categoryProvider =
          Provider.of<CategoryProvider>(context, listen: false);

      final finalCategoryId = _selectedCategoryId ??
          subscription.category ??
          getDefaultCategoryId(categoryProvider);

      // websiteUrl 처리
      final websiteUrl = websiteUrlController.text.trim().isNotEmpty
          ? websiteUrlController.text.trim()
          : subscription.websiteUrl;

      Log.d(
          '구독 추가 시도: ${subscription.serviceName}, 카테고리: $finalCategoryId, URL: $websiteUrl');

      // addSubscription 호출
      await provider.addSubscription(
        serviceName: subscription.serviceName,
        monthlyCost: subscription.monthlyCost,
        billingCycle: subscription.billingCycle,
        nextBillingDate: subscription.nextBillingDate,
        websiteUrl: websiteUrl,
        isAutoDetected: true,
        repeatCount: subscription.repeatCount,
        lastPaymentDate: subscription.lastPaymentDate,
        categoryId: finalCategoryId,
        currency: subscription.currency,
      );

      Log.i('구독 추가 성공: ${subscription.serviceName}');
      if (!context.mounted) return;
      moveToNextSubscription(context);
    } catch (e) {
      Log.e('구독 추가 중 오류 발생', e);
      // 오류가 있어도 다음 구독으로 이동
      if (!context.mounted) return;
      moveToNextSubscription(context);
    }
  }

  void skipCurrentSubscription(BuildContext context) {
    final subscription = _scannedSubscriptions[_currentIndex];
    Log.i('구독 건너뛰기: ${subscription.serviceName}');
    moveToNextSubscription(context);
  }

  void moveToNextSubscription(BuildContext context) {
    _currentIndex++;
    websiteUrlController.text = ''; // URL 입력 필드 초기화
    _selectedCategoryId = null; // 카테고리 선택 초기화

    // 모든 구독을 처리했으면 홈 화면으로 이동
    if (_currentIndex >= _scannedSubscriptions.length) {
      navigateToHome(context);
    }

    notifyListeners();
  }

  void navigateToHome(BuildContext context) {
    // NavigationProvider를 사용하여 홈 화면으로 이동
    final navigationProvider =
        Provider.of<NavigationProvider>(context, listen: false);
    navigationProvider.updateCurrentIndex(0);
  }

  void resetState() {
    _scannedSubscriptions = [];
    _currentIndex = 0;
    _errorMessage = null;
    notifyListeners();
  }

  String getDefaultCategoryId(CategoryProvider categoryProvider) {
    final otherCategory = categoryProvider.categories.firstWhere(
      (cat) => cat.name == 'other',
      orElse: () => categoryProvider.categories.first,
    );
    Log.d('기본 카테고리 설정: ${otherCategory.name} (ID: ${otherCategory.id})');
    return otherCategory.id;
  }

  void initializeWebsiteUrl() {
    if (_currentIndex < _scannedSubscriptions.length) {
      final currentSub = _scannedSubscriptions[_currentIndex];
      if (websiteUrlController.text.isEmpty && currentSub.websiteUrl != null) {
        websiteUrlController.text = currentSub.websiteUrl!;
      }
    }
  }
}