import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../core/app_keys.dart';
import '../core/notifications/keep_alive.dart';
import '../core/notifications/local_notifications.dart';
import '../core/theme/app_theme.dart';
import '../core/theme/app_typography.dart';
import '../features/auth/application/session_controller.dart';
import '../features/notice/application/notice_alert_controller.dart';
import 'router.dart';

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

  @override
  ConsumerState<VoltLinkApp> createState() => _VoltLinkAppState();
}

class _VoltLinkAppState extends ConsumerState<VoltLinkApp> {
  StreamSubscription<String>? _tapSub;

  @override
  void initState() {
    super.initState();
    // 运行期点击系统通知 → 跳转对应页面
    _tapSub = LocalNotifications.instance.taps.listen(_openRoute);
    WidgetsBinding.instance.addPostFrameCallback((_) {
      // 冷启动由通知拉起时，初始化阶段已把路由暂存下来
      final route = LocalNotifications.instance.takeLaunchRoute();
      if (route != null) _openRoute(route);
      // 已登录则开启 Android 前台服务
      unawaited(
        BackgroundKeepAlive.setEnabled(ref.read(sessionProvider).isLoggedIn),
      );
    });
  }

  @override
  void dispose() {
    _tapSub?.cancel();
    super.dispose();
  }

  void _openRoute(String route) {
    if (!mounted || route.isEmpty) return;
    ref.read(routerProvider).go(route);
  }

  @override
  Widget build(BuildContext context) {
    final router = ref.watch(routerProvider);

    // 登录/登出时同步 Android 前台服务开关
    ref.listen(sessionProvider.select((s) => s.isLoggedIn), (_, loggedIn) {
      unawaited(BackgroundKeepAlive.setEnabled(loggedIn));
    });

    // 激活站内消息提醒轮询
    ref.watch(noticeAlertProvider);

    return MaterialApp.router(
      title: 'VoltLink',
      debugShowCheckedModeBanner: false,
      theme: AppTheme.build(),
      routerConfig: router,
      scaffoldMessengerKey: AppKeys.scaffoldMessenger,
      locale: const Locale('zh', 'CN'),
      supportedLocales: const [Locale('zh', 'CN'), Locale('en', 'US')],
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      // 对应源 `page` 上的全局字体设置。
      builder: (context, child) => DefaultTextStyle(
        style: appDefaultTextStyle,
        child: child ?? const SizedBox.shrink(),
      ),
    );
  }
}