import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:get/get.dart';
import 'package:catcher_2/catcher_2.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:mom_kitchen/src/l10n/app_localizations.dart';

import 'package:mom_kitchen/src/config/app_routes.dart';

import 'package:mom_kitchen/src/services/core/app_service.dart';
import 'package:mom_kitchen/src/services/api/api_service.dart';
import 'package:mom_kitchen/src/services/system/orientation_service.dart';
import 'package:mom_kitchen/src/services/ui/theme_service.dart';
import 'package:mom_kitchen/src/services/ui/toast_service.dart';
import 'package:mom_kitchen/src/services/data/storage/storage_service.dart';
import 'package:mom_kitchen/src/services/system/crash_guard_service.dart';

import 'package:mom_kitchen/src/app_binding.dart';

import 'package:mom_kitchen/src/utils/app_logger.dart';

// 2026-04-15 | main.dart | 应用入口 | Catcher2最先初始化+串行化启动流程防ANR
// 2026-04-15 | 增强防御：所有初始化步骤加超时+try-catch，任何一步失败都不阻断启动
// 2026-04-15 | Trae IDE兼容：增强错误处理，防止调试环境闪退
void main() {
  runZonedGuarded(
    () {
      final crashGuard = CrashGuardService();
      Catcher2(
        runAppFunction: () async {
          WidgetsFlutterBinding.ensureInitialized();

          PlatformDispatcher.instance.onError = (error, stack) {
            debugPrint('🚨 PlatformDispatcher Error: $error');
            try {
              Catcher2.reportCheckedError(error, stack);
            } catch (_) {
              debugPrint('❌ PlatformDispatcher report failed: $error');
            }
            return true;
          };

          FlutterError.onError = (details) {
            FlutterError.presentError(details);
            try {
              Catcher2.reportCheckedError(details.exception, details.stack);
            } catch (_) {
              debugPrint(
                '❌ FlutterError.onError catch failed: ${details.exception}',
              );
            }
          };

          try {
            await _initApp();
          } catch (e, st) {
            debugPrint('🚨 _initApp failed: $e');
            debugPrint('Stack: $st');
          }

          runApp(const MyApp());
        },
        ensureInitialized: false,
        debugConfig: crashGuard.buildDebugOptions(),
        releaseConfig: crashGuard.buildReleaseOptions(),
      );
    },
    (error, stack) {
      debugPrint('🚨 Uncaught async error: $error');
      debugPrint('Stack: $stack');
    },
  );
}

/// 启动初始化链 - 每一步都有独立超时和try-catch
/// 核心原则：任何一步失败都不阻断后续步骤，保证App至少能启动
Future<void> _initApp() async {
  // 0. 加载环境变量（含SMTP等敏感配置，不阻断启动）
  try {
    await dotenv
        .load(fileName: '.env')
        .timeout(
          const Duration(seconds: 3),
          onTimeout: () => debugPrint('⚠️ .env加载超时(3s)'),
        );
  } catch (e) {
    debugPrint('⚠️ .env加载失败(使用默认空值): $e');
  }

  // 1. 核心服务初始化（最关键，但不阻断）
  try {
    await AppService.instance.init().timeout(
      const Duration(seconds: 10),
      onTimeout: () => debugPrint('❌ AppService初始化超时(10s)'),
    );
  } catch (e) {
    debugPrint('❌ AppService初始化失败: $e');
  }

  // 2. DNS预检（非关键，纯后台）
  try {
    await ApiService().preCheckDns().timeout(
      const Duration(seconds: 5),
      onTimeout: () => debugPrint('⚠️ DNS预检超时(5s)'),
    );
  } catch (e) {
    debugPrint('⚠️ DNS预检失败: $e');
  }

  // 3. CrashGuard初始化
  try {
    await CrashGuardService.init().timeout(const Duration(seconds: 3));
  } catch (e) {
    debugPrint('⚠️ CrashGuardService初始化失败或超时: $e');
  }

  if (kDebugMode) {
    AppRoutes.registerAllPages();
  }

  await OrientationService().unlockOrientation();
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  ThemeService _getThemeService() {
    if (Get.isRegistered<ThemeService>()) {
      return Get.find<ThemeService>();
    }
    return Get.put(ThemeService.instance, permanent: true);
  }

  @override
  Widget build(BuildContext context) {
    final themeService = _getThemeService();

    return Obx(() {
      final textScale = themeService.fontSize.value / 16.0;
      return GetCupertinoApp(
        title: 'Mom\'s Kitchen',
        navigatorKey: Catcher2.navigatorKey,
        theme: themeService.cupertinoThemeData,
        locale: Locale(themeService.currentLocale.value),
        debugShowCheckedModeBanner: false,
        localizationsDelegates: AppLocalizations.localizationsDelegates,
        supportedLocales: const [
          Locale('en'),
          Locale('zh'),
          Locale('zh', 'Hant'),
        ],
        getPages: AppRoutes.pages,
        initialBinding: AppBinding(),
        builder: (context, widget) {
          return MediaQuery(
            data: MediaQuery.of(
              context,
            ).copyWith(textScaler: TextScaler.linear(textScale)),
            child: ColoredBox(
              color: themeService.backgroundColor.value,
              child: widget ?? const SizedBox.shrink(),
            ),
          );
        },
        routingCallback: (routing) {
          if (kDebugMode && routing?.current != null) {
            AppLogger.d('🔍 路由变化: ${routing?.previous} → ${routing?.current}');
          }
        },
        home: const _InitWrapper(),
      );
    });
  }
}

class _InitWrapper extends StatefulWidget {
  const _InitWrapper();

  @override
  State<_InitWrapper> createState() => _InitWrapperState();
}

class _InitWrapperState extends State<_InitWrapper>
    with WidgetsBindingObserver {
  bool _navigated = false;
  int _retryCount = 0;
  static const int _maxRetries = 5;
  String? _lastError;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _navigateToMain();
    });
  }

  void _navigateToMain() {
    if (!mounted || _navigated) return;
    try {
      ToastService.init(context);
      final agreementAccepted =
          StorageService().getBool('agreement_accepted') ?? false;
      if (agreementAccepted) {
        Get.offAllNamed(AppRoutes.main);
      } else {
        Get.offAllNamed(AppRoutes.guide);
      }
      _navigated = true;
      debugPrint('✅ 导航到${agreementAccepted ? '主页面' : '引导页'}成功');
    } catch (e, st) {
      _lastError = e.toString();
      _retryCount++;
      debugPrint('❌ 导航失败 (第$_retryCount次): $e');
      debugPrint('Stack: $st');
      if (_retryCount < _maxRetries) {
        Future.delayed(Duration(milliseconds: 300 * _retryCount), () {
          if (mounted && !_navigated) _navigateToMain();
        });
      } else {
        debugPrint('🚨 导航重试已达上限，显示错误页面');
        if (mounted) setState(() {});
      }
    }
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangePlatformBrightness() {
    super.didChangePlatformBrightness();
    final brightness =
        WidgetsBinding.instance.platformDispatcher.platformBrightness;
    try {
      final themeService = Get.find<ThemeService>();
      themeService.onSystemBrightnessChanged(brightness);
    } catch (_) {}
  }

  @override
  Widget build(BuildContext context) {
    if (_retryCount >= _maxRetries) {
      return CupertinoPageScaffold(
        child: SafeArea(
          child: Center(
            child: Padding(
              padding: const EdgeInsets.all(24),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  const Icon(
                    CupertinoIcons.exclamationmark_triangle,
                    size: 48,
                    color: CupertinoColors.systemRed,
                  ),
                  const SizedBox(height: 16),
                  const Text(
                    '启动失败，请重试',
                    style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
                  ),
                  if (_lastError != null) ...[
                    const SizedBox(height: 12),
                    Container(
                      padding: const EdgeInsets.all(12),
                      decoration: BoxDecoration(
                        color: CupertinoColors.systemGrey5,
                        borderRadius: BorderRadius.circular(8),
                      ),
                      child: Text(
                        _lastError!.length > 200
                            ? '${_lastError!.substring(0, 200)}...'
                            : _lastError!,
                        style: const TextStyle(
                          fontSize: 12,
                          fontFamily: 'monospace',
                        ),
                        textAlign: TextAlign.center,
                      ),
                    ),
                  ],
                  const SizedBox(height: 24),
                  Row(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      CupertinoButton(
                        onPressed: () {
                          _retryCount = 0;
                          _lastError = null;
                          setState(() {});
                          _navigateToMain();
                        },
                        child: const Text('重试'),
                      ),
                      const SizedBox(width: 16),
                      CupertinoButton.filled(
                        onPressed: () {
                          _retryCount = 0;
                          _lastError = null;
                          _navigated = false;
                          setState(() {});
                          _navigateToMain();
                        },
                        child: const Text('强制重启'),
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ),
        ),
      );
    }
    return const CupertinoPageScaffold(
      child: Center(child: CupertinoActivityIndicator()),
    );
  }
}