platforms/apps/user_app/lib/app/router.dart

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

import '../ui/features/auth/login_page.dart';
import '../ui/features/auth/register_page.dart';
import '../ui/features/home/home_page.dart';
import '../ui/features/orders/orders_page.dart';
import '../ui/features/profile/profile_page.dart';
import '../ui/features/shared/record_list_page.dart';
import '../ui/features/shared/record_list_view_model.dart';
import '../ui/features/shop/shop_page.dart';
import 'dependencies.dart';

GoRouter createRouter(AppDependencies dependencies) => GoRouter(
  initialLocation: '/home',
  refreshListenable: dependencies.session,
  redirect: (context, state) {
    final authRoute = state.matchedLocation == '/login' || state.matchedLocation == '/register';
    if (!dependencies.session.isAuthenticated && !authRoute) return '/login';
    if (dependencies.session.isAuthenticated && state.matchedLocation == '/login') return '/home';
    return null;
  },
  routes: [
    GoRoute(
      path: '/login',
      builder: (context, state) => LoginPage(session: dependencies.session),
    ),
    GoRoute(
      path: '/register',
      builder: (context, state) => RegisterPage(session: dependencies.session),
    ),
    GoRoute(
      path: '/records/contracts',
      builder: (context, state) => RecordListPage(
        title: '供气合同',
        eyebrow: '可信履约',
        viewModel: RecordListViewModel(dependencies.repository.contracts),
      ),
    ),
    GoRoute(
      path: '/records/wallet',
      builder: (context, state) => RecordListPage(
        title: '钱包流水',
        eyebrow: '资金记录',
        viewModel: RecordListViewModel(dependencies.repository.walletRecords),
      ),
    ),
    StatefulShellRoute.indexedStack(
      builder: (context, state, navigationShell) => _UserShell(navigationShell: navigationShell),
      branches: [
        StatefulShellBranch(
          routes: [
            GoRoute(
              path: '/home',
              builder: (context, state) => HomePage(repository: dependencies.repository),
            ),
          ],
        ),
        StatefulShellBranch(
          routes: [
            GoRoute(
              path: '/shop',
              builder: (context, state) => ShopPage(repository: dependencies.repository),
            ),
          ],
        ),
        StatefulShellBranch(
          routes: [
            GoRoute(
              path: '/orders',
              builder: (context, state) => OrdersPage(repository: dependencies.repository),
            ),
          ],
        ),
        StatefulShellBranch(
          routes: [
            GoRoute(
              path: '/me',
              builder: (context, state) =>
                  ProfilePage(session: dependencies.session, repository: dependencies.repository),
            ),
          ],
        ),
      ],
    ),
  ],
);

class _UserShell extends StatelessWidget {
  const _UserShell({required this.navigationShell});

  final StatefulNavigationShell navigationShell;

  @override
  Widget build(BuildContext context) => Scaffold(
    body: navigationShell,
    bottomNavigationBar: NavigationBar(
      selectedIndex: navigationShell.currentIndex,
      onDestinationSelected: (index) =>
          navigationShell.goBranch(index, initialLocation: index == navigationShell.currentIndex),
      destinations: const [
        NavigationDestination(
          icon: Icon(Icons.home_outlined),
          selectedIcon: Icon(Icons.home),
          label: '首页',
        ),
        NavigationDestination(
          icon: Icon(Icons.shopping_bag_outlined),
          selectedIcon: Icon(Icons.shopping_bag),
          label: '商城',
        ),
        NavigationDestination(
          icon: Icon(Icons.receipt_long_outlined),
          selectedIcon: Icon(Icons.receipt_long),
          label: '订单',
        ),
        NavigationDestination(
          icon: Icon(Icons.person_outline),
          selectedIcon: Icon(Icons.person),
          label: '我的',
        ),
      ],
    ),
  );
}