sojorn/sojorn_app/lib/routes/app_routes.dart

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:latlong2/latlong.dart';
import '../services/auth_service.dart';
import '../services/api_service.dart';
import '../screens/admin/admin_dashboard_screen.dart';
import '../screens/admin/admin_scaffold.dart';
import '../screens/admin/admin_user_base_screen.dart';
import '../screens/admin/moderation_queue_screen.dart';
import '../screens/beacon/beacon_screen.dart';
import '../screens/home/feed_personal_screen.dart';
import '../screens/home/home_shell.dart';
import '../screens/quips/create/quip_creation_flow.dart';
import '../screens/quips/feed/quips_feed_screen.dart';
import '../screens/profile/profile_screen.dart';
import '../screens/profile/viewable_profile_screen.dart';
import '../screens/auth/auth_gate.dart';
import '../screens/secure_chat/secure_chat_full_screen.dart';

/// App routing config (GoRouter).
class AppRoutes {
  static final GlobalKey<NavigatorState> rootNavigatorKey =
      GlobalKey<NavigatorState>();

  static const String home = '/';
  static const String homeAlias = '/home';
  static const String userPrefix = '/u';
  static const String postPrefix = '/p';
  static const String beaconPrefix = '/beacon';
  static const String quips = '/quips';
  static const String profile = '/profile';
  static const String secureChat = '/secure-chat';
  static const String quipCreate = '/quips/create';

  static final AuthRefreshNotifier _authRefreshNotifier =
      AuthRefreshNotifier(AuthService.instance.authStateChanges);

  static final GoRouter router = GoRouter(
    navigatorKey: rootNavigatorKey,
    initialLocation: homeAlias,
    refreshListenable: _authRefreshNotifier,
    redirect: _adminRedirect,
    routes: [
      GoRoute(
        path: home,
        redirect: (_, __) => homeAlias,
      ),
      GoRoute(
        path: '$userPrefix/:username',
        parentNavigatorKey: rootNavigatorKey,
        builder: (_, state) => ViewableProfileScreen(
          handle: state.pathParameters['username'] ?? '',
        ),
      ),
      GoRoute(
        path: quipCreate,
        parentNavigatorKey: rootNavigatorKey,
        builder: (_, __) => const QuipCreationFlow(),
      ),
      GoRoute(
        path: secureChat,
        parentNavigatorKey: rootNavigatorKey,
        builder: (_, __) => const SecureChatFullScreen(),
      ),
      StatefulShellRoute.indexedStack(
        builder: (context, state, navigationShell) => AuthGate(
          authenticatedChild: HomeShell(navigationShell: navigationShell),
        ),
        branches: [
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: homeAlias,
                builder: (_, __) => const FeedPersonalScreen(),
              ),
            ],
          ),
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: beaconPrefix,
                builder: (_, state) {
                  final latParam = state.uri.queryParameters['lat'];
                  final longParam = state.uri.queryParameters['long'];
                  final lat = latParam != null ? double.tryParse(latParam) : null;
                  final long = longParam != null ? double.tryParse(longParam) : null;

                  if (lat != null && long != null) {
                    return BeaconScreen(initialMapCenter: LatLng(lat, long));
                  }

                  return const BeaconScreen();
                },
              ),
            ],
          ),
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: quips,
                builder: (_, __) => const QuipsFeedScreen(),
              ),
            ],
          ),
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: profile,
                builder: (_, __) => const ProfileScreen(),
              ),
            ],
          ),
        ],
      ),
      ShellRoute(
        builder: (context, state, child) {
          final index = _adminIndexForPath(state.uri.path);
          return AdminScaffold(selectedIndex: index, child: child);
        },
        routes: [
          GoRoute(
            path: '/admin',
            builder: (_, __) => const AdminDashboardScreen(),
          ),
          GoRoute(
            path: '/admin/moderation',
            builder: (_, __) => const ModerationQueueScreen(),
          ),
          GoRoute(
            path: '/admin/users',
            builder: (_, __) => const AdminUserBaseScreen(),
          ),
        ],
      ),
    ],
  );

  static int _adminIndexForPath(String path) {
    if (path.startsWith('/admin/moderation')) return 1;
    if (path.startsWith('/admin/users')) return 2;
    return 0;
  }

  static FutureOr<String?> _adminRedirect(
    BuildContext context,
    GoRouterState state,
  ) async {
    final path = state.uri.path;
    if (!path.startsWith('/admin')) return null;

    final user = AuthService.instance.currentUser;
    if (user == null) return homeAlias;

    try {
      final data = await ApiService.instance.callGoApi('/profile', method: 'GET');
      final profile = data['profile'];
      if (profile is Map<String, dynamic>) {
        final role = profile['role'] as String?;
        if (role == 'admin' || role == 'moderator') {
          return null;
        }
      }
    } catch (_) {}

    return homeAlias;
  }

  /// Navigate to a user profile by username
  static void navigateToProfile(BuildContext context, String username) {
    context.push('/u/$username');
  }

  /// Get shareable URL for a user profile
  /// Returns: https://gosojorn.com/u/username
  static String getProfileUrl(
    String username, {
    String baseUrl = 'https://gosojorn.com',
  }) {
    return '$baseUrl/u/$username';
  }

  /// Get shareable URL for a post (future implementation)
  /// Returns: https://gosojorn.com/p/postid
  static String getPostUrl(
    String postId, {
    String baseUrl = 'https://gosojorn.com',
  }) {
    return '$baseUrl/p/$postId';
  }

  /// Get shareable URL for a beacon location
  /// Returns: https://gosojorn.com/beacon?lat=...&long=...
  static String getBeaconUrl(
    double lat,
    double long, {
    String baseUrl = 'https://gosojorn.com',
  }) {
    return '$baseUrl/beacon?lat=${lat.toStringAsFixed(6)}&long=${long.toStringAsFixed(6)}';
  }

  /// Navigate to a beacon location
  static void navigateToBeacon(BuildContext context, LatLng location) {
    final url =
        '/beacon?lat=${location.latitude.toStringAsFixed(6)}&long=${location.longitude.toStringAsFixed(6)}';
    context.push(url);
  }

  /// Navigate to secure chat
  static void navigateToSecureChat(BuildContext context) {
    context.push(secureChat);
  }
}

class AuthRefreshNotifier extends ChangeNotifier {
  late final StreamSubscription<AuthState> _subscription;

  AuthRefreshNotifier(Stream<AuthState> stream) {
    _subscription = stream.listen((_) => notifyListeners());
  }

  @override
  void dispose() {
    _subscription.cancel();
    super.dispose();
  }
}