import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import 'core/app_router.dart';
import 'core/app_theme.dart';
import 'core/navigation_provider.dart';
import 'providers/auth_provider.dart';

/// 健康管家 App 根组件
class HealthApp extends ConsumerWidget {
  const HealthApp({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return MaterialApp(
      title: '健康管家',
      debugShowCheckedModeBanner: false,
      theme: AppTheme.lightTheme,
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: const [Locale('zh', 'CN'), Locale('zh')],
      locale: const Locale('zh'),
      home: const _RootNavigator(),
      // 注入 ShadTheme，让所有页面都能用 shadcn 组件
      builder: (context, child) =>
          ShadTheme(data: AppTheme.shadTheme, child: child!),
    );
  }
}

/// 根导航——根据 Riverpod 路由状态切换页面
class _RootNavigator extends ConsumerWidget {
  const _RootNavigator();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final stack = ref.watch(routeStackProvider);
    final current = stack.last;
    final authState = ref.watch(authProvider);

    // 登录后自动跳转（在下一帧完成，无闪烁）
    if (authState.isLoggedIn && current.name == 'login') {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        final role = authState.user?.role ?? 'User';
        if (role == 'Admin') {
          goRoute(ref, 'adminHome');
        } else if (role == 'Doctor') {
          goRoute(ref, 'doctorHome');
        } else {
          goRoute(ref, 'home');
        }
      });
    }

    return PopScope(
      canPop: stack.length <= 1,
      onPopInvokedWithResult: (didPop, result) {
        if (!didPop) popRoute(ref);
      },
      child: buildPage(current, ref),
    );
  }
}