import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'pages/battery_health_page.dart';
import 'services/saf_storage_service.dart';

// 🆕 1.7.0 全局 Key，用于从子页面切换主题
final GlobalKey<_MyAppState> appKey = GlobalKey<_MyAppState>();

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await SafStorageService().init();

  final prefs = await SharedPreferences.getInstance();
  final themeModeIndex = prefs.getInt('themeMode') ?? 0;
  final themeMode =
      ThemeMode.values[themeModeIndex.clamp(0, ThemeMode.values.length - 1)];

  runApp(MyApp(key: appKey, initialThemeMode: themeMode));
}

class MyApp extends StatefulWidget {
  final ThemeMode initialThemeMode;
  const MyApp({super.key, required this.initialThemeMode});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  late ThemeMode _themeMode;

  @override
  void initState() {
    super.initState();
    _themeMode = widget.initialThemeMode;
  }

  void switchTheme(ThemeMode mode) {
    setState(() {
      _themeMode = mode;
    });
    SharedPreferences.getInstance().then((prefs) {
      prefs.setInt('themeMode', mode.index);
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '电池健康度',
      theme: _lightTheme(),
      darkTheme: _darkTheme(),
      themeMode: _themeMode,
      home: const BatteryHealthPage(),
      debugShowCheckedModeBanner: false,
    );
  }

  ThemeData _lightTheme() {
    return ThemeData(
      fontFamily: 'HarmonyOS_Sans_SC',
      fontFamilyFallback: const ['Flyme'],
      useMaterial3: true,
      brightness: Brightness.light,
      scaffoldBackgroundColor: Colors.white,
      appBarTheme: const AppBarTheme(
        backgroundColor: Colors.white,
        foregroundColor: Colors.black,
        elevation: 0,
        centerTitle: false,
      ),
      iconTheme: const IconThemeData(color: Colors.black),
      colorScheme: const ColorScheme.light(
        primary: Color(0xFF1A73E8),
        secondary: Color(0xFF1A73E8),
        surface: Colors.white,
        onSurface: Colors.black, // 🟢 主要文字色
        onSurfaceVariant: Colors.black87,
      ),
      textTheme: const TextTheme(
        bodyLarge: TextStyle(color: Colors.black),
        bodyMedium: TextStyle(color: Colors.black87),
        labelLarge: TextStyle(color: Colors.black),
      ),
      dividerColor: Colors.grey.shade200,
    );
  }

  ThemeData _darkTheme() {
    return ThemeData(
      fontFamily: 'HarmonyOS_Sans_SC',
      fontFamilyFallback: const ['Flyme'],
      useMaterial3: true,
      brightness: Brightness.dark,
      scaffoldBackgroundColor: const Color(0xFF121212),
      appBarTheme: const AppBarTheme(
        backgroundColor: Color(0xFF1E1E1E),
        foregroundColor: Colors.white,
        elevation: 0,
        centerTitle: false,
      ),
      iconTheme: const IconThemeData(color: Colors.white),
      colorScheme: const ColorScheme.dark(
        primary: Color(0xFF4FC3F7),
        secondary: Color(0xFF4FC3F7),
        surface: Color(0xFF121212),
        onSurface: Colors.white, // 🟢 主要文字色（夜间模式为白色）
        onSurfaceVariant: Colors.white70,
      ),
      textTheme: const TextTheme(
        bodyLarge: TextStyle(color: Colors.white),
        bodyMedium: TextStyle(color: Colors.white70),
        labelLarge: TextStyle(color: Colors.white),
      ),
      dividerColor: Colors.grey.shade800,
    );
  }
}