import 'dart:io';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:package_info_plus/package_info_plus.dart';

/// 设备工具类
class DeviceUtils {
  static final DeviceInfoPlugin _deviceInfo = DeviceInfoPlugin();
  static PackageInfo? _packageInfo;

  /// 初始化（在应用启动时调用）
  static Future<void> init() async {
    _packageInfo = await PackageInfo.fromPlatform();
  }

  // ==================== 平台信息 ====================

  /// 是否为 Android 平台
  static bool get isAndroid => Platform.isAndroid;

  /// 是否为 iOS 平台
  static bool get isIOS => Platform.isIOS;

  /// 是否为 Web 平台
  static bool get isWeb => Platform.isWindows || Platform.isLinux || Platform.isMacOS;

  // ==================== 设备信息 ====================

  /// 获取设备 ID
  static Future<String?> getDeviceId() async {
    try {
      if (isAndroid) {
        final androidInfo = await _deviceInfo.androidInfo;
        return androidInfo.id;
      } else if (isIOS) {
        final iosInfo = await _deviceInfo.iosInfo;
        return iosInfo.identifierForVendor;
      }
    } catch (e) {
      return null;
    }
    return null;
  }

  /// 获取设备型号
  static Future<String?> getDeviceModel() async {
    try {
      if (isAndroid) {
        final androidInfo = await _deviceInfo.androidInfo;
        return androidInfo.model;
      } else if (isIOS) {
        final iosInfo = await _deviceInfo.iosInfo;
        return iosInfo.model;
      }
    } catch (e) {
      return null;
    }
    return null;
  }

  /// 获取设备品牌
  static Future<String?> getDeviceBrand() async {
    try {
      if (isAndroid) {
        final androidInfo = await _deviceInfo.androidInfo;
        return androidInfo.brand;
      } else if (isIOS) {
        final iosInfo = await _deviceInfo.iosInfo;
        return 'Apple';
      }
    } catch (e) {
      return null;
    }
    return null;
  }

  /// 获取系统版本
  static Future<String?> getSystemVersion() async {
    try {
      if (isAndroid) {
        final androidInfo = await _deviceInfo.androidInfo;
        return 'Android ${androidInfo.version.release}';
      } else if (isIOS) {
        final iosInfo = await _deviceInfo.iosInfo;
        return 'iOS ${iosInfo.systemVersion}';
      }
    } catch (e) {
      return null;
    }
    return null;
  }

  // ==================== 应用信息 ====================

  /// 获取应用版本号
  static String? get appVersion => _packageInfo?.version;

  /// 获取构建号
  static String? get buildNumber => _packageInfo?.buildNumber;

  /// 获取包名
  static String? get packageName => _packageInfo?.packageName;

  /// 获取应用名称
  static String? get appName => _packageInfo?.appName;

  /// 获取完整版本信息
  static String? get fullVersion => 
      _packageInfo != null 
          ? '${_packageInfo!.version}+${_packageInfo!.buildNumber}'
          : null;

  // ==================== 设备标识 ====================

  /// 获取用户代理字符串
  static Future<String> getUserAgent() async {
    final deviceId = await getDeviceId() ?? 'unknown';
    final deviceModel = await getDeviceModel() ?? 'unknown';
    final systemVersion = await getSystemVersion() ?? 'unknown';
    final appVersion = DeviceUtils.appVersion ?? 'unknown';
    
    return 'SinoMedCloud/$appVersion ($deviceModel; $systemVersion; DeviceID: $deviceId)';
  }
}