submanager/lib/navigation/app_navigation_observer.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/navigation_provider.dart';

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

  @override
  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
    super.didPop(route, previousRoute);
    if (previousRoute != null) {
      _updateNavigationState(previousRoute);
    } else {
      // 이전 라우트가 없으면 Provider의 히스토리를 사용
      _handlePopWithProvider();
    }
    debugPrint('Navigation: Pop ${route.settings.name}');
  }

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

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

  void _updateNavigationState(Route<dynamic> route) {
    if (navigator?.context == null) return;
    
    final routeName = route.settings.name;
    if (routeName == null) return;
    
    // build 완료 후 업데이트하도록 변경
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (navigator?.context == null) return;
      
      try {
        final context = navigator!.context;
        final navigationProvider = Provider.of<NavigationProvider>(context, listen: false);
        navigationProvider.updateByRoute(routeName);
      } catch (e) {
        debugPrint('Failed to update navigation state: $e');
      }
    });
  }

  void _handlePopWithProvider() {
    if (navigator?.context == null) return;
    
    // build 완료 후 업데이트하도록 변경
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (navigator?.context == null) return;
      
      try {
        final context = navigator!.context;
        final navigationProvider = Provider.of<NavigationProvider>(context, listen: false);
        navigationProvider.pop();
      } catch (e) {
        debugPrint('Failed to handle pop with provider: $e');
      }
    });
  }
}