import 'dart:async';

import 'package:app_links/app_links.dart';
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:go_router/go_router.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:shadcn_ui/shadcn_ui.dart';

import '../common/router/app_router.dart';
import '../common/lifecycle/refresh_coordinator.dart';
import '../common/push/device_push_registrar.dart';
import '../common/push/umeng_push_service.dart';
import '../common/theme/jinzhi_theme.dart';
import '../common/theme/spacing.dart';
import '../common/theme/theme_controller.dart';
import '../features/ads/application/ad_config_foreground_refresher.dart';
import '../features/settings/application/update_foreground_service.dart';
import '../features/web/application/mall_web_host_controller.dart';
import '../features/auth/application/auth_controller.dart';
import '../features/auth/application/auth_session_coordinator.dart';
import '../features/auth/data/auth_models.dart';
import '../features/assets/application/asset_portfolio_controller.dart';
import '../common/router/deep_link_service.dart';
import '../common/services/device_header_service.dart';

class JinzhiApp extends ConsumerStatefulWidget {
  const JinzhiApp({super.key});

  @override
  ConsumerState<JinzhiApp> createState() => _JinzhiAppState();
}

class _JinzhiAppState extends ConsumerState<JinzhiApp>
    with WidgetsBindingObserver {
  late final DevicePushRegistrar _pushRegistrar;
  ProviderSubscription<AsyncValue<AuthState>>? _authSubscription;
  StreamSubscription<Uri>? _appLinkSubscription;
  late final SessionEndListener _sessionEndListener;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    _pushRegistrar = DevicePushRegistrar(ref.read)..start();
    _sessionEndListener = (reason) {
      if (reason == SessionEndReason.accountDeleted) {
        ref.read(assetPortfolioControllerProvider.notifier).clearHoldings();
      }
    };
    ref.read(authSessionCoordinatorProvider).addListener(_sessionEndListener);
    _authSubscription = ref.listenManual<AsyncValue<AuthState>>(authProvider, (
      previous,
      next,
    ) {
      final oldUser = previous?.valueOrNull is LoggedInAuthState
          ? (previous!.valueOrNull! as LoggedInAuthState).user.id
          : null;
      final newUser = next.valueOrNull is LoggedInAuthState
          ? (next.valueOrNull! as LoggedInAuthState).user.id
          : null;
      if (oldUser != newUser) _pushRegistrar.forceRegisterCurrentToken();
      DeepLinkService.notifyAuthChanged();
    });
    UmengPushService.configureNotificationOpen(DeepLinkService.handle);
    unawaited(_startAppLinks());
    WidgetsBinding.instance.addPostFrameCallback((_) {
      DeepLinkService.attachRouter((location) {
        final context = rootNavigatorKey.currentContext;
        if (context == null) return false;
        context.go(location);
        return true;
      }, authGuard: (_) => !ref.read(authProvider).isLoading);
      // 首次 iOS 启动在欢迎页点击进入后才注册 APNs，确保系统弹窗不被启动页
      // 或其他 Overlay 吞掉；后续启动和 Android 保持原有自动初始化。
      if (!DeviceHeaderService.to.iosStartupRequired) {
        unawaited(UmengPushService.startIfAllowed());
      }
    });
  }

  Future<void> _startAppLinks() async {
    try {
      final appLinks = AppLinks();
      final initial = await appLinks.getInitialLink();
      if (initial != null) DeepLinkService.handleUri(initial);
      _appLinkSubscription = appLinks.uriLinkStream.listen(
        DeepLinkService.handleUri,
        onError: (_) {},
      );
    } catch (_) {
      // Desktop tests and unsupported platforms may not register the plugin.
    }
  }

  @override
  void dispose() {
    unawaited(_pushRegistrar.stop());
    _authSubscription?.close();
    ref
        .read(authSessionCoordinatorProvider)
        .removeListener(_sessionEndListener);
    unawaited(_appLinkSubscription?.cancel());
    DeepLinkService.detachRouter();
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      unawaited(_pushRegistrar.refresh());
      unawaited(
        ref
            .read(adConfigForegroundRefresherProvider)
            .refresh(
              refreshMallTabConfig:
                  !MallWebHostController.instance.state.value.visible,
            ),
      );
      final context = rootNavigatorKey.currentContext;
      if (context != null) {
        unawaited(UpdateForegroundService.check(context, ref));
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    // Keep the app-wide foreground refresh coordinator alive. Features opt in
    // by registering only while their screen is visible.
    ref.watch(refreshCoordinatorProvider);
    final router = ref.watch(routerProvider);
    final mode = ref.watch(themeModeControllerProvider);
    // DM Sans 作主字体（拉丁/数字），中文走系统级联（iOS 苹方 / Android 厂商
    // 中文字体）——主流做法，不显式点名、不内置字体。
    final dmSansFamily = GoogleFonts.dmSans().fontFamily;
    final textTheme = ShadTextTheme(family: dmSansFamily);
    return ShadApp.router(
      title: '金值',
      themeMode: mode,
      theme: ShadThemeData(
        brightness: Brightness.light,
        colorScheme: jinzhiLightScheme,
        textTheme: textTheme,
        radius: BorderRadius.circular(Spacing.radiusBase),
      ),
      darkTheme: ShadThemeData(
        brightness: Brightness.dark,
        colorScheme: jinzhiDarkScheme,
        textTheme: textTheme,
        radius: BorderRadius.circular(Spacing.radiusBase),
      ),
      routerConfig: router,
    );
  }
}