// settings_provider.dart — 本地应用设置(持久化 + 副作用落地)。
//
// 三个开关均本地持久化(shared_preferences),并落地真实行为:
//   - killSwitch → VpnBridge.setKillSwitch(改 TUN strict_route 并重载内核)
//   - autostart  → 桌面端原生登录项(launch_at_startup)
//   - smartRoute → 持久化为偏好,连接时作为 split_cn 下发(geoip-cn 直连,见 #5)
import 'dart:io';

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:launch_at_startup/launch_at_startup.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../bridge/log.dart';
import '../bridge/vpn_bridge_provider.dart';

class AppSettings {
  const AppSettings({
    this.autostart = true,
    this.autoConnect = false,
    this.smartRoute = true,
    this.killSwitch = true,
    this.loaded = false,
  });
  final bool autostart;
  final bool autoConnect; // 启动 app 时自动连接(opt-in,默认关)
  final bool smartRoute;
  final bool killSwitch;
  final bool loaded; // 是否已从持久化加载完(自动连接要等它 true 再读 autoConnect,避免竞态)

  AppSettings copyWith({bool? autostart, bool? autoConnect, bool? smartRoute, bool? killSwitch, bool? loaded}) =>
      AppSettings(
        autostart: autostart ?? this.autostart,
        autoConnect: autoConnect ?? this.autoConnect,
        smartRoute: smartRoute ?? this.smartRoute,
        killSwitch: killSwitch ?? this.killSwitch,
        loaded: loaded ?? this.loaded,
      );
}

const _kAutostart = 'set_autostart';
const _kAutoConnect = 'set_auto_connect';
const _kSmartRoute = 'set_smart_route';
const _kKillSwitch = 'set_kill_switch';

// Windows 任务计划名(开机自启用最高权限任务,绕开注册表 Run 起不来/弹 UAC)。
const _kWinTaskName = 'PangolinAutostart';

class SettingsController extends StateNotifier<AppSettings> {
  SettingsController(this._ref) : super(const AppSettings()) {
    _load();
  }

  final Ref _ref;
  final bool _desktop = Platform.isMacOS || Platform.isWindows || Platform.isLinux;

  Future<void> _load() async {
    var s = const AppSettings(loaded: true); // 失败也标 loaded:true,自动连接才不会永久等
    try {
      final p = await SharedPreferences.getInstance();
      if (!mounted) return; // 异步初始化期间已 dispose:别再写 state。
      s = AppSettings(
        autostart: p.getBool(_kAutostart) ?? true,
        autoConnect: p.getBool(_kAutoConnect) ?? false,
        smartRoute: p.getBool(_kSmartRoute) ?? true,
        killSwitch: p.getBool(_kKillSwitch) ?? true,
        loaded: true,
      );
    } catch (_) {
      // 测试/无平台:用默认值(已标 loaded)。
    }
    if (!mounted) return;
    state = s;
    logLine('Settings', 'loaded autoConnect=${s.autoConnect} autostart=${s.autostart}');
    _applyKillSwitch(s.killSwitch);
    if (_desktop) await _applyAutostart(s.autostart);
  }

  Future<void> setAutostart(bool v) async {
    state = state.copyWith(autostart: v);
    await _persist(_kAutostart, v);
    if (_desktop) await _applyAutostart(v);
  }

  Future<void> setAutoConnect(bool v) async {
    state = state.copyWith(autoConnect: v);
    await _persist(_kAutoConnect, v);
    logLine('Settings', 'setAutoConnect=$v persisted');
  }

  Future<void> setSmartRoute(bool v) async {
    state = state.copyWith(smartRoute: v);
    await _persist(_kSmartRoute, v);
  }

  Future<void> setKillSwitch(bool v) async {
    state = state.copyWith(killSwitch: v);
    await _persist(_kKillSwitch, v);
    _applyKillSwitch(v);
  }

  void _applyKillSwitch(bool v) {
    try {
      _ref.read(vpnBridgeProvider).setKillSwitch(on: v);
    } catch (_) {
      // 桥未就绪/测试环境:忽略,持久化值在下次连接时生效。
    }
  }

  Future<void> _applyAutostart(bool v) async {
    try {
      // Windows:本应用 requireAdministrator,注册表 Run 键(非提权)开机会弹 UAC/起不来,
      // 改用任务计划程序 /rl highest 登录触发任务 → 静默提权自启。
      if (Platform.isWindows) {
        await _applyWindowsAutostart(v);
        return;
      }
      // macOS/Linux:登录项即可(无需管理员)。带 --autostart:登录拉起时隐藏到托盘
      // (与 Windows 一致;main.dart 读该参数 windowManager.hide(),macOS 原生侧 orderOut 兜底)。
      final info = await PackageInfo.fromPlatform();
      launchAtStartup.setup(
        appName: info.appName,
        appPath: Platform.resolvedExecutable,
        args: const ['--autostart'],
      );
      if (v) {
        await launchAtStartup.enable();
      } else {
        await launchAtStartup.disable();
      }
    } catch (_) {
      // 登录项注册失败(权限/调试运行)不应阻塞 UI。
    }
  }

  // 用 schtasks 建/删最高权限登录触发任务。app 已是管理员 → 可建 /rl highest 任务,
  // 开机由计划程序静默提权拉起、不弹 UAC。/tr 含空格路径须内嵌引号。
  // 带 --autostart 标志:让开机拉起的实例直接最小化到托盘(不弹主窗口),见 main.dart。
  Future<void> _applyWindowsAutostart(bool v) async {
    if (v) {
      final exe = Platform.resolvedExecutable;
      await Process.run('schtasks', [
        '/create', '/tn', _kWinTaskName,
        '/tr', '"$exe" --autostart',
        '/sc', 'onlogon',
        '/rl', 'highest',
        '/f',
      ]);
    } else {
      await Process.run('schtasks', ['/delete', '/tn', _kWinTaskName, '/f']);
    }
  }

  Future<void> _persist(String key, bool v) async {
    final p = await SharedPreferences.getInstance();
    await p.setBool(key, v);
  }
}

final settingsProvider =
    StateNotifierProvider<SettingsController, AppSettings>((ref) => SettingsController(ref));

/// 应用版本号(来自 pubspec,经 package_info_plus)。
final appVersionProvider = FutureProvider<String>((ref) async {
  final info = await PackageInfo.fromPlatform();
  return 'v${info.version}';
});