import 'package:flutter/foundation.dart';
import 'package:go_router/go_router.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';

import '../../features/backups/backups_screen.dart';
import '../../features/dashboard/dashboard_screen.dart';
import '../../features/fleet/fleet_screen.dart';
import '../../features/services/services_screen.dart';
import '../../features/settings/settings_screen.dart';
import '../../features/updates/updates_screen.dart';
import '../connections/connection_providers.dart';
import '../widgets/nav_rail_shell.dart';
import 'route_paths.dart';

part 'app_router.g.dart';

/// Bridges Riverpod's [activeConnectionProvider] to go_router's
/// [Listenable]-based `refreshListenable` — so removing/adding the active
/// connection re-evaluates the top-level redirect immediately, not just on
/// the next navigation.
class _ConnectionRefreshListenable extends ChangeNotifier {
  _ConnectionRefreshListenable(Ref ref) {
    ref.listen(activeConnectionProvider, (previous, next) => notifyListeners());
  }
}

@Riverpod(keepAlive: true)
GoRouter appRouter(Ref ref) {
  return GoRouter(
    initialLocation: RoutePaths.dashboard,
    refreshListenable: _ConnectionRefreshListenable(ref),
    redirect: (context, state) {
      final hasConnection = ref.read(activeConnectionProvider) != null;
      final onSettings = state.matchedLocation == RoutePaths.settings;
      if (!hasConnection && !onSettings) return RoutePaths.settings;
      return null;
    },
    routes: [
      ShellRoute(
        builder: (context, state, child) {
          return NavRailShell(currentPath: state.uri.path, child: child);
        },
        routes: [
          GoRoute(
            path: RoutePaths.dashboard,
            builder: (context, state) => const DashboardScreen(),
          ),
          GoRoute(
            path: RoutePaths.services,
            builder: (context, state) => ServicesScreen(serviceId: state.uri.queryParameters['id']),
          ),
          GoRoute(
            path: RoutePaths.backups,
            builder: (context, state) => const BackupsScreen(),
          ),
          GoRoute(
            path: RoutePaths.fleet,
            builder: (context, state) => const FleetScreen(),
          ),
          GoRoute(
            path: RoutePaths.updates,
            builder: (context, state) => const UpdatesScreen(),
          ),
          GoRoute(
            path: RoutePaths.settings,
            builder: (context, state) => const SettingsScreen(),
          ),
        ],
      ),
    ],
  );
}