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_colors.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);

    // 启动时正在检查登录状态 → 显示闪屏
    if (authState.isLoading && current.name == 'login') {
      return Scaffold(
        backgroundColor: Colors.white,
        body: Center(
          child: Column(mainAxisSize: MainAxisSize.min, children: [
            Icon(Icons.favorite, size: 48, color: AppColors.primary),
            const SizedBox(height: 16),
            Text('健康管家', style: TextStyle(fontSize: 22, fontWeight: FontWeight.w700, color: AppColors.textPrimary)),
          ]),
        ),
      );
    }

    // 登录后根据角色分流
    if (authState.isLoggedIn && current.name == 'login') {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        goRoute(ref, authState.user?.role == 'Doctor' ? 'doctorHome' : 'home');
      });
    }

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