import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import 'core/providers.dart';
import 'core/theme.dart';
import 'features/auth/login_screen.dart';
import 'features/orders/order_detail_screen.dart';
import 'features/orders/orders_screen.dart';
import 'features/results/results_screen.dart';
import 'features/shops/shop_detail_screen.dart';
import 'features/shops/shops_screen.dart';
import 'features/shops/tickets_screen.dart';
import 'features/users/user_detail_screen.dart';
import 'features/users/user_form_screen.dart';
import 'features/users/users_screen.dart';
import 'widgets/main_shell.dart';

final routerProvider = Provider<GoRouter>((ref) {
  final refresh = ValueNotifier<int>(0);
  ref.listen(sessionProvider, (_, _) => refresh.value++);
  ref.onDispose(refresh.dispose);

  Page<void> tab(GoRouterState s, Widget w) =>
      NoTransitionPage<void>(key: s.pageKey, child: w);

  return GoRouter(
    initialLocation: '/results',
    refreshListenable: refresh,
    redirect: (context, state) {
      final user = ref.read(sessionProvider);
      final loc = state.matchedLocation;
      if (user == null) return loc == '/login' ? null : '/login';
      if (loc == '/login') return '/results';
      if (loc.startsWith('/users') && !user.isAdmin) return '/results';
      return null;
    },
    routes: [
      GoRoute(path: '/login', builder: (_, _) => const LoginScreen()),
      // Every signed-in screen lives in the shell, so the sidebar stays in
      // place on wide windows while detail screens open beside it.
      ShellRoute(
        builder: (_, s, child) =>
            MainShell(location: s.matchedLocation, child: child),
        routes: [
          GoRoute(
            path: '/results',
            pageBuilder: (_, s) => tab(s, const ResultsScreen()),
          ),
          GoRoute(
            path: '/shops',
            pageBuilder: (_, s) => tab(s, const ShopsScreen()),
            routes: [
              GoRoute(
                path: ':id',
                builder: (_, s) => ShopDetailScreen(shopId: _id(s)),
                routes: [
                  GoRoute(
                    path: 'tickets',
                    builder: (_, s) => TicketsScreen(shopId: _id(s)),
                  ),
                ],
              ),
            ],
          ),
          GoRoute(
            path: '/orders',
            pageBuilder: (_, s) => tab(s, const OrdersScreen()),
            routes: [
              GoRoute(
                path: ':id',
                builder: (_, s) => OrderDetailScreen(orderId: _id(s)),
              ),
            ],
          ),
          GoRoute(
            path: '/users',
            pageBuilder: (_, s) => tab(s, const UsersScreen()),
            routes: [
              GoRoute(path: 'new', builder: (_, _) => const UserFormScreen()),
              GoRoute(
                path: ':id',
                builder: (_, s) => UserDetailScreen(userId: _id(s)),
              ),
            ],
          ),
        ],
      ),
    ],
  );
});

int _id(GoRouterState s) => int.parse(s.pathParameters['id']!);

class SrsApp extends ConsumerWidget {
  const SrsApp({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return MaterialApp.router(
      title: 'SRS',
      debugShowCheckedModeBanner: false,
      theme: buildTheme(),
      routerConfig: ref.watch(routerProvider),
    );
  }
}