// 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/vpn_bridge_provider.dart';

class AppSettings {
  const AppSettings({this.autostart = true, this.smartRoute = true, this.killSwitch = true});
  final bool autostart;
  final bool smartRoute;
  final bool killSwitch;

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

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

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 {
    try {
      final p = await SharedPreferences.getInstance();
      state = AppSettings(
        autostart: p.getBool(_kAutostart) ?? true,
        smartRoute: p.getBool(_kSmartRoute) ?? true,
        killSwitch: p.getBool(_kKillSwitch) ?? true,
      );
    } catch (_) {
      // 测试/无平台:保留默认值。
    }
    _applyKillSwitch(state.killSwitch);
    if (_desktop) await _applyAutostart(state.autostart);
  }

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

  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 {
      final info = await PackageInfo.fromPlatform();
      launchAtStartup.setup(appName: info.appName, appPath: Platform.resolvedExecutable);
      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。
    }
  }

  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}';
});