import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:tatlock_ui/core/auth/auth_provider.dart';
import 'package:tatlock_ui/features/control_room/router.dart';
import 'package:tatlock_ui/features/front_hall/router.dart';
import 'package:tatlock_ui/features/media_room/router.dart';
import 'package:tatlock_ui/features/parlor/router.dart';
import 'package:tatlock_ui/features/security/router.dart';
import 'package:tatlock_ui/features/settings/presentation/pages/settings_page.dart';
import 'package:tatlock_ui/routing/room_registry.dart';
import 'package:tatlock_ui/shared/layouts/app_scaffold.dart';

part 'app_router.g.dart';

/// Initialize room registry with all rooms.
///
/// Called once before creating the router.
/// Order of registration determines tab order in UI.
void _initializeRoomRegistry() {
  // Skip if already initialized
  if (roomRegistry.all.isNotEmpty) return;

  // Register rooms in display order
  registerFrontHall();
  registerControlRoom();
  registerSecurity();
  registerParlor();
  registerMediaRoom();
}

/// No-animation page builder for instant transitions
Page<void> noTransitionPage(BuildContext context, GoRouterState state, Widget child) {
  return NoTransitionPage<void>(
    key: state.pageKey,
    child: child,
  );
}

/// Route paths as constants.
abstract class AppRoutes {
  static const root = '/';
  static const settings = '/settings';
}

/// Maps defaultRoom preference value to route path.
String _routeForDefaultRoom(String? defaultRoom) {
  // Look up room in registry, fall back to first room's default route
  final room = roomRegistry.byId(defaultRoom ?? '');
  if (room != null) {
    return room.defaultRoute;
  }
  // Default to first registered room (Front Hall)
  return roomRegistry.all.isNotEmpty
      ? roomRegistry.all.first.defaultRoute
      : FrontHallRoutes.base;
}

/// Provides the GoRouter instance.
@riverpod
GoRouter appRouter(Ref ref) {
  // Initialize room registry on first access
  _initializeRoomRegistry();

  final authState = ref.watch(authProvider);

  return GoRouter(
    initialLocation: AppRoutes.root,
    debugLogDiagnostics: true,
    redirect: (context, state) {
      // Redirect from root to user's default room preference
      if (state.matchedLocation == AppRoutes.root) {
        final defaultRoom = authState.value?.preferences?.defaultRoom;
        return _routeForDefaultRoom(defaultRoom);
      }
      return null;
    },
    routes: [
      // Root redirects to default room (handled by redirect callback above)
      GoRoute(
        path: AppRoutes.root,
        redirect: (context, state) => _routeForDefaultRoom(null),
      ),
      // Main app routes (inside shell with app scaffold)
      ShellRoute(
        builder: (context, state, child) => AppScaffold(child: child),
        routes: [
          // All room routes from registry
          ...roomRegistry.allRoutes(),
          // Settings page (not a room, just a page)
          GoRoute(
            path: AppRoutes.settings,
            name: 'settings',
            pageBuilder: (context, state) =>
                noTransitionPage(context, state, const SettingsPage()),
          ),
        ],
      ),
    ],
  );
}