import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:provider/provider.dart';
import '../screens/category_management_screen.dart';
import '../screens/app_lock_screen.dart';
import '../models/subscription_model.dart';
import '../providers/navigation_provider.dart';
import '../routes/app_routes.dart';
import 'animated_page_transitions.dart';

/// 앱 전체의 네비게이션을 관리하는 클래스
class AppNavigator {
  // NavigationProvider를 사용하여 상태를 관리하므로 더 이상 싱글톤 패턴이 필요하지 않음

  /// 홈으로 네비게이션
  static Future<void> toHome(BuildContext context) async {
    HapticFeedback.lightImpact();
    final navigationProvider = context.read<NavigationProvider>();
    navigationProvider.clearHistoryAndGoHome();
    
    await Navigator.of(context).pushNamedAndRemoveUntil(
      AppRoutes.main,
      (route) => false,
    );
  }

  /// 분석 화면으로 네비게이션
  static Future<void> toAnalysis(BuildContext context) async {
    HapticFeedback.lightImpact();
    final navigationProvider = context.read<NavigationProvider>();
    navigationProvider.updateCurrentIndex(1);
    
    await Navigator.of(context).pushNamed(AppRoutes.analysis);
  }

  /// 구독 추가 화면으로 네비게이션
  static Future<void> toAddSubscription(BuildContext context) async {
    HapticFeedback.mediumImpact();
    
    await Navigator.of(context).pushNamed(AppRoutes.addSubscription);
  }

  /// 구독 상세 화면으로 네비게이션
  static Future<void> toDetail(BuildContext context, SubscriptionModel subscription) async {
    print('AppNavigator.toDetail 호출됨: ${subscription.serviceName}');
    HapticFeedback.lightImpact();
    
    try {
      await Navigator.of(context).pushNamed(
        AppRoutes.subscriptionDetail,
        arguments: subscription,
      );
      print('DetailScreen 네비게이션 성공');
    } catch (e) {
      print('DetailScreen 네비게이션 오류: $e');
    }
  }

  /// SMS 스캔 화면으로 네비게이션
  static Future<void> toSmsScan(BuildContext context) async {
    HapticFeedback.lightImpact();
    final navigationProvider = context.read<NavigationProvider>();
    navigationProvider.updateCurrentIndex(3);
    
    await Navigator.of(context).pushNamed(AppRoutes.smsScanner);
  }

  /// 설정 화면으로 네비게이션
  static Future<void> toSettings(BuildContext context) async {
    HapticFeedback.lightImpact();
    final navigationProvider = context.read<NavigationProvider>();
    navigationProvider.updateCurrentIndex(4);
    
    await Navigator.of(context).pushNamed(AppRoutes.settings);
  }

  /// 카테고리 관리 화면으로 네비게이션
  static Future<void> toCategoryManagement(BuildContext context) async {
    HapticFeedback.lightImpact();
    
    await Navigator.of(context).push(
      SlidePageRoute(
        page: const CategoryManagementScreen(),
        direction: AxisDirection.up,
      ),
    );
  }

  /// 앱 잠금 화면으로 네비게이션
  static Future<void> toAppLock(BuildContext context) async {
    await Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) => const AppLockScreen(),
        fullscreenDialog: true,
      ),
    );
  }

  /// 뒤로가기 처리
  static Future<bool> handleBackButton(BuildContext context) async {
    final navigator = Navigator.of(context);
    final navigationProvider = context.read<NavigationProvider>();
    
    // 네비게이션 스택이 있으면 팝
    if (navigator.canPop()) {
      HapticFeedback.lightImpact();
      
      // NavigationProvider의 히스토리를 사용하여 이전 인덱스로 복원
      if (navigationProvider.canPop()) {
        navigationProvider.pop();
      }
      
      navigator.pop();
      return false;
    }
    
    // 앱 종료 확인
    final shouldExit = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('앱 종료'),
        content: const Text('SubManager를 종료하시겠습니까?'),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(false),
            child: const Text('취소'),
          ),
          TextButton(
            onPressed: () => Navigator.of(context).pop(true),
            child: const Text('종료'),
          ),
        ],
      ),
    );
    
    return shouldExit ?? false;
  }

  /// 플로팅 네비게이션 바 탭 처리
  static void handleFloatingNavTap(BuildContext context, int index) {
    final navigationProvider = context.read<NavigationProvider>();
    final currentIndex = navigationProvider.currentIndex;
    
    // 같은 탭을 다시 탭하면 아무 동작 안 함
    if (currentIndex == index) {
      return;
    }
    
    // 현재 화면이 메인이 아니면 먼저 메인으로 돌아가기
    if (Navigator.of(context).canPop()) {
      Navigator.of(context).popUntil((route) => route.isFirst);
    }
    
    // 선택된 인덱스에 따라 네비게이션
    switch (index) {
      case 0: // 홈
        navigationProvider.updateCurrentIndex(0);
        break;
      case 1: // 분석
        toAnalysis(context);
        break;
      case 2: // 추가
        toAddSubscription(context);
        break;
      case 3: // SMS
        toSmsScan(context);
        break;
      case 4: // 설정
        toSettings(context);
        break;
    }
  }
}

/// 네비게이션 관찰자 (디버깅용)
class AppNavigationObserver extends NavigatorObserver {
  @override
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
    super.didPush(route, previousRoute);
    debugPrint('Navigation: Push ${route.settings.name}');
  }

  @override
  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
    super.didPop(route, previousRoute);
    debugPrint('Navigation: Pop ${route.settings.name}');
  }

  @override
  void didRemove(Route<dynamic> route, Route<dynamic>? previousRoute) {
    super.didRemove(route, previousRoute);
    debugPrint('Navigation: Remove ${route.settings.name}');
  }

  @override
  void didReplace({Route<dynamic>? newRoute, Route<dynamic>? oldRoute}) {
    super.didReplace(newRoute: newRoute, oldRoute: oldRoute);
    debugPrint('Navigation: Replace ${oldRoute?.settings.name} with ${newRoute?.settings.name}');
  }
}