import 'dart:io';

import '../utils/command_runner.dart';

/// 开机自启：mac 写 LaunchAgent（RunAtLoad 一次性——托盘退出不能被拉回，故不用 KeepAlive）；
/// Windows 写 HKCU Run 注册表键（reg 命令实现，免 win32 依赖）。
/// 自启指向当前可执行文件（Platform.resolvedExecutable），以安装位置为准。
class Autostart {
  static const macLabel = 'com.zax.desktop-plugin';
  static const winRunName = 'ZaxDesktopPlugin';

  static bool get isSupported => Platform.isMacOS || Platform.isWindows;

  static String? get _macPlistPath {
    final home = Platform.environment['HOME'];
    if (home == null) return null;
    return '$home/Library/LaunchAgents/$macLabel.plist';
  }

  /// 自启是否已开启。
  static Future<bool> isEnabled() async {
    if (Platform.isMacOS) {
      final path = _macPlistPath;
      return path != null && File(path).existsSync();
    }
    if (Platform.isWindows) {
      final r = await runCommand(
        'reg',
        ['query', r'HKCU\Software\Microsoft\Windows\CurrentVersion\Run', '/v', winRunName],
        tolerateExit: true,
      );
      return r.contains(winRunName);
    }
    return false;
  }

  /// 开启自启（mac 顺带把 C# 助手的 LaunchAgent 状态返回，供向导提示端口关系）。
  static Future<void> enable() async {
    if (Platform.isMacOS) {
      final path = _macPlistPath;
      if (path == null) throw StateError('无法定位用户目录');
      final exe = Platform.resolvedExecutable;
      await Directory(File(path).parent.path).create(recursive: true);
      await File(path).writeAsString('''
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>$macLabel</string>
	<key>ProgramArguments</key>
	<array>
		<string>$exe</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
	<key>LaunchOnlyOnce</key>
	<true/>
</dict>
</plist>
''');
      return;
    }
    if (Platform.isWindows) {
      final exe = Platform.resolvedExecutable;
      await runCommand('reg', [
        'add', r'HKCU\Software\Microsoft\Windows\CurrentVersion\Run',
        '/v', winRunName, '/t', 'REG_SZ', '/d', '"$exe"', '/f',
      ]);
      return;
    }
    throw UnsupportedError('当前平台不支持开机自启');
  }

  static Future<void> disable() async {
    if (Platform.isMacOS) {
      final path = _macPlistPath;
      if (path != null && File(path).existsSync()) {
        await File(path).delete();
      }
      return;
    }
    if (Platform.isWindows) {
      await runCommand(
        'reg',
        ['delete', r'HKCU\Software\Microsoft\Windows\CurrentVersion\Run', '/v', winRunName, '/f'],
        tolerateExit: true, // 不存在时也算关闭成功
      );
      return;
    }
    throw UnsupportedError('当前平台不支持开机自启');
  }

  /// C# 版助手的 LaunchAgent 是否在（本机灰度共存提示用；mac only）。
  static bool get legacyCsharpAgentInstalled {
    if (!Platform.isMacOS) return false;
    final home = Platform.environment['HOME'];
    return home != null &&
        File('$home/Library/LaunchAgents/com.zax.cardprinteragent.plist').existsSync();
  }
}