pangolin/client/lib/main.dart

// main.dart — 入口(演示态)
// 串接:登录 → 引导 → 主框架(4 Tab);状态层统一走 Riverpod。
import 'dart:io';
import 'dart:ui' as ui;

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

import 'bridge/log.dart';
import 'bridge/vpn_bridge_provider.dart';
import 'pangolin_theme.dart';
import 'services/token_store.dart';
import 'shell/home_shell.dart';
import 'state/app_providers.dart';
import 'state/auth_provider.dart';
import 'state/connection_provider.dart';
import 'state/nodes_provider.dart';
import 'state/settings_provider.dart';
import 'system_tray.dart';
import 'widgets/auth_screen.dart';
import 'widgets/onboarding_screen.dart';
import 'widgets/pangolin_logo.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  // 桌面端:单实例 + 常驻系统托盘(关闭窗口隐藏到托盘而非退出)。
  if (isDesktop) {
    if (!await ensureSingleInstance()) {
      exit(0); // 已有实例在跑(已唤起其窗口),本进程退出。
    }
    await TrayService.instance.init();
    // 桌面窗口尺寸：默认 920×640；最小宽 720（低于 form_factor 的 680 阈值会
    // 掉进 MobileShell，侧栏消失）。init() 内已 windowManager.ensureInitialized()。
    await windowManager.setMinimumSize(const Size(720, 560));
    await windowManager.setSize(const Size(920, 640));
    await windowManager.center();
    // 窗口标题用中文品牌名(不带 "VPN" 字眼);英文环境下原生标题为 "Pangolin"。
    await windowManager.setTitle('穿山甲');
  }
  runApp(const ProviderScope(child: PangolinApp()));
}

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

  @override
  ConsumerState<PangolinApp> createState() => _PangolinAppState();
}

class _PangolinAppState extends ConsumerState<PangolinApp> {
  AppLifecycleListener? _lifecycle;
  // 是否正在「真退出」(托盘「退出」菜单触发)。区分:点关闭只隐藏到托盘、保持隧道。
  bool _isQuitting = false;

  @override
  void initState() {
    super.initState();
    if (isDesktop) {
      // 关闭 / 退出请求的处理:
      // - Windows:点 X / Alt+F4 会触发 onExitRequested,但桌面端要常驻托盘、隧道不断
      //   → 取消退出并隐藏到托盘。真正退出只走托盘「退出」菜单(见 onBeforeQuit)。
      //   (否则会出现:连接被拆、窗口却只是隐藏,即「关掉就断网但进程还在」。)
      // - macOS:Cmd+Q 等真退出 → 先停内核拆隧道再退出(红叉关闭走 onWindowClose 隐藏)。
      _lifecycle = AppLifecycleListener(onExitRequested: () async {
        if (Platform.isWindows && !_isQuitting) {
          await windowManager.hide();
          return ui.AppExitResponse.cancel;
        }
        await _teardownVpn();
        return ui.AppExitResponse.exit;
      });
      // 托盘「退出」前置钩子:标记真退出 + 停内核拆隧道(避免 sing-box 孤儿 + TUN 残留)。
      TrayService.instance.onBeforeQuit = () async {
        _isQuitting = true;
        await _teardownVpn();
      };
    }
  }

  Future<void> _teardownVpn() async {
    try {
      await ref.read(vpnBridgeProvider).stop().timeout(const Duration(seconds: 3));
    } catch (_) {
      // 内核未启动/已退出:忽略。
    }
  }

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

  @override
  Widget build(BuildContext context) {
    final mode = ref.watch(themeModeProvider);
    return MaterialApp(
      title: '穿山甲',
      debugShowCheckedModeBanner: false,
      theme: PangolinTheme.light,
      darkTheme: PangolinTheme.dark,
      themeMode: mode,
      home: const RootFlow(),
    );
  }
}

/// 应用根流转:启动时若已有有效会话(7 天内 refresh 有效)直接进主界面,
/// 免登陆;会话失效则回登录页。引导页仅首次注册/登录后看一次。
class RootFlow extends ConsumerStatefulWidget {
  const RootFlow({super.key});
  @override
  ConsumerState<RootFlow> createState() => _RootFlowState();
}

class _RootFlowState extends ConsumerState<RootFlow> {
  final _store = const TokenStore();
  bool _forceOnboarding = false;
  bool _autoConnectArmed = false; // 自动连接每进程只尝试一次
  bool _homeLogged = false; // 仅日志:HomeShell 首次显示打一行

  // 进入登录态主界面后:若开了「自动连接」且当前未连接,等节点就绪后自动连一次。
  void _maybeAutoConnect() {
    if (_autoConnectArmed) return;
    _autoConnectArmed = true;
    logLine('AutoConnect', 'armed; waiting for nodes ready');
    // 注意:不在此处早读 settingsProvider.autoConnect —— 其 _load 是异步(SharedPreferences),
    // 启动这一刻多半还没加载完,会读到默认 false 而永久跳过。改到「节点就绪」回调里再判:
    // 节点要走网络拉取,远慢于本地设置读取,那时 autoConnect 必已加载到位。
    late final ProviderSubscription sub;
    sub = ref.listenManual(nodesProvider, (prev, next) {
      final nodes = next.valueOrNull ?? const [];
      final ready = nodes.any((n) => n.uuid.isNotEmpty);
      logLine('AutoConnect', 'nodes update: total=${nodes.length} ready=$ready loading=${next.isLoading} err=${next.hasError}');
      if (!ready) return;
      sub.close();
      final ac = ref.read(settingsProvider).autoConnect;
      final phase = ref.read(connectionProvider).phase;
      logLine('AutoConnect', 'nodes ready → autoConnect=$ac phase=$phase');
      if (ac && phase == VpnPhase.off) {
        logLine('AutoConnect', 'triggering connect');
        ref.read(connectionProvider.notifier).toggle();
      } else {
        logLine('AutoConnect', 'NOT connecting (autoConnect=$ac phase=$phase)');
      }
    }, fireImmediately: true);
  }

  // 登录/注册成功后:未看过引导才进引导,否则直接主界面。
  Future<void> _afterAuth() async {
    final onboarded = await _store.isOnboarded();
    if (!mounted) return;
    setState(() => _forceOnboarding = !onboarded);
  }

  Future<void> _afterOnboarding() async {
    await _store.markOnboarded();
    if (!mounted) return;
    setState(() => _forceOnboarding = false);
  }

  @override
  Widget build(BuildContext context) {
    final t = ref.watch(appTextProvider);
    final auth = ref.watch(authProvider);

    if (auth.isLoading) return const _Splash();
    if (!auth.isLoggedIn) {
      return AuthScreen(t: t, onDone: () { _afterAuth(); });
    }
    if (_forceOnboarding) {
      return OnboardingScreen(t: t, onDone: () { _afterOnboarding(); });
    }
    if (!_homeLogged) {
      _homeLogged = true;
      logLine('AutoConnect', 'HomeShell shown; scheduling auto-connect check');
    }
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (mounted) _maybeAutoConnect();
    });
    return const HomeShell();
  }
}

/// 会话恢复期间的极简启动屏(避免登录页一闪而过)。
class _Splash extends StatelessWidget {
  const _Splash();
  @override
  Widget build(BuildContext context) => const Scaffold(
        body: Center(child: PangolinMark(size: 56)),
      );
}