import 'dart:io';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_udid/flutter_udid.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import '../utils/kr_secure_storage.dart';
import '../utils/kr_log_util.dart';
import 'package:crypto/crypto.dart';
import 'dart:convert';

/// 设备信息服务
/// 用于获取设备唯一标识和其他设备信息
class KRDeviceInfoService {
  static final KRDeviceInfoService _instance = KRDeviceInfoService._internal();
  factory KRDeviceInfoService() => _instance;
  KRDeviceInfoService._internal();

  final DeviceInfoPlugin _deviceInfo = DeviceInfoPlugin();
  String? _deviceId;
  Map<String, dynamic>? _deviceDetails;

  // 获取设备唯一标识
  String? get deviceId => _deviceId;

  // 获取设备详细信息
  Map<String, dynamic>? get deviceDetails => _deviceDetails;

  /// 初始化设备信息
  Future<void> initialize() async {
    try {
      KRLogUtil.kr_i('📱 开始初始化设备信息', tag: 'KRDeviceInfoService');

      _deviceId = await _getDeviceId();
      _deviceDetails = await _getDeviceDetails();

      if (kDebugMode) {
        // print('✅ 设备信息初始化成功');
        // print('📱 设备ID: $_deviceId');
        // print('📱 设备平台: ${getPlatformName()}');
        // print('📱 设备型号: ${getDeviceModel()}');
        // print('📱 系统版本: ${getOSVersion()}');
        // print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');
      }

      KRLogUtil.kr_i('✅ 设备信息初始化成功', tag: 'KRDeviceInfoService');
      // KRLogUtil.kr_i('📱 设备ID - $_deviceId', tag: 'KRDeviceInfoService');
      // KRLogUtil.kr_i('📱 设备详情 - $_deviceDetails', tag: 'KRDeviceInfoService');
    } catch (e) {
      if (kDebugMode) {
        print('❌ 设备信息初始化失败: $e');
      }
      KRLogUtil.kr_e('❌ 设备信息初始化失败 - $e', tag: 'KRDeviceInfoService');
    }
  }

  /// 获取设备唯一标识
  /// 使用多因子组合策略确保唯一性和稳定性
  Future<String> _getDeviceId() async {
    try {
      String identifier;

      if (Platform.isAndroid) {
        identifier = await _getAndroidDeviceId();
      } else if (Platform.isIOS) {
        identifier = await _getIOSDeviceId();
      } else if (Platform.isMacOS) {
        identifier = await _getMacOSDeviceId();
      } else if (Platform.isWindows) {
        identifier = await _getWindowsDeviceId();
      } else if (Platform.isLinux) {
        identifier = await _getLinuxDeviceId();
      } else {
        // Web或其他平台,使用生成的UUID
        identifier = await _getOrCreateStoredDeviceId();
      }

      // 如果获取失败,使用存储的或生成新的ID
      if (identifier.isEmpty) {
        identifier = await _getOrCreateStoredDeviceId();
      }

      return identifier;
    } catch (e) {
      if (kDebugMode) {
        print('❌ 获取设备ID失败: $e');
      }
      KRLogUtil.kr_e('❌ 获取设备ID失败 - $e', tag: 'KRDeviceInfoService');
      // 如果获取失败,返回存储的或生成新的ID
      return await _getOrCreateStoredDeviceId();
    }
  }

  /// Android设备ID - 多因子组合
  /// 组合: AndroidID + 设备型号 + 主板信息 + 硬件信息
  Future<String> _getAndroidDeviceId() async {
    try {
      final androidInfo = await _deviceInfo.androidInfo;

      // 优先使用 flutter_udid (封装了多种Android标识获取方式)
      String udid = await FlutterUdid.consistentUdid;

      // 构建多因子字符串
      final factors = [
        udid,
        androidInfo.id, // Android ID
        androidInfo.board, // 主板
        androidInfo.bootloader, // Bootloader
        androidInfo.brand, // 品牌
        androidInfo.device, // 设备名
        androidInfo.fingerprint, // 系统指纹
        androidInfo.hardware, // 硬件名
        androidInfo.manufacturer, // 制造商
        androidInfo.model, // 型号
        androidInfo.product, // 产品名
      ];

      // 过滤空值并组合
      final combined = factors
          .where((f) => f != null && f.isNotEmpty)
          .join('|');

      // 生成SHA256哈希
      final bytes = utf8.encode(combined);
      final hash = sha256.convert(bytes);

      if (kDebugMode) {
        print('📱 Android多因子ID生成 - 因子数: ${factors.where((f) => f != null && f.isNotEmpty).length}');
      }
      KRLogUtil.kr_i('📱 Android多因子ID - $hash', tag: 'KRDeviceInfoService');

      return hash.toString();
    } catch (e) {
      if (kDebugMode) {
        print('❌ Android设备ID获取失败: $e');
      }
      KRLogUtil.kr_e('❌ Android设备ID获取失败 - $e', tag: 'KRDeviceInfoService');
      return '';
    }
  }

  /// iOS设备ID - 优先使用Keychain存储的UUID（卸载重装后不变）
  /// iOS的identifierForVendor在所有同供应商应用卸载后会重置
  /// 使用flutter_secure_storage存储到iOS Keychain，保证即使卸载重装，设备ID也不会变化
  Future<String> _getIOSDeviceId() async {
    try {
      const keychainKey = 'kr_ios_device_persistent_id';

      final storage = FlutterSecureStorage();

      // 1. 优先从 Keychain 读取已存储的设备ID
      String? storedId = await storage.read(key: keychainKey);

      if (storedId != null && storedId.isNotEmpty) {
        if (kDebugMode) {
          print('📱 iOS: 从 Keychain 读取已存储的设备ID');
        }
        KRLogUtil.kr_i('📱 iOS: 使用 Keychain 中的持久化设备ID', tag: 'KRDeviceInfoService');
        return storedId;
      }

      // 2. 如果 Keychain 中没有，生成新的设备ID
      final iosInfo = await _deviceInfo.iosInfo;

      String udid = await FlutterUdid.consistentUdid;

      final factors = [
        udid,
        iosInfo.utsname.machine,
        iosInfo.model,
        iosInfo.systemName,
      ];

      final combined = factors.where((f) => f.isNotEmpty).join('|');

      final bytes = utf8.encode(combined);
      final hash = sha256.convert(bytes);
      final newDeviceId = hash.toString();

      // 3. 保存到 Keychain
      await storage.write(key: keychainKey, value: newDeviceId);

      if (kDebugMode) {
        print('📱 iOS: 生成新设备ID并保存到 Keychain');
      }
      KRLogUtil.kr_i('📱 iOS: 新设备ID已保存到 Keychain', tag: 'KRDeviceInfoService');

      return newDeviceId;
    } catch (e) {
      if (kDebugMode) {
        print('❌ iOS设备ID获取失败: $e');
      }
      KRLogUtil.kr_e('❌ iOS设备ID获取失败 - $e', tag: 'KRDeviceInfoService');
      return '';
    }
  }

  /// macOS设备ID - 使用硬件UUID
  Future<String> _getMacOSDeviceId() async {
    try {
      final macInfo = await _deviceInfo.macOsInfo;

      // 优先使用 flutter_udid
      String udid = await FlutterUdid.consistentUdid;

      // 构建多因子字符串
      final factors = [
        udid,
        macInfo.systemGUID ?? '', // 系统GUID (最稳定)
        macInfo.model, // 型号
        macInfo.hostName, // 主机名
        macInfo.arch, // 架构
        macInfo.kernelVersion, // 内核版本
      ];

      final combined = factors
          .where((f) => f.isNotEmpty)
          .join('|');

      final bytes = utf8.encode(combined);
      final hash = sha256.convert(bytes);

      if (kDebugMode) {
        print('📱 macOS多因子ID生成 - 因子数: ${factors.where((f) => f.isNotEmpty).length}');
      }
      KRLogUtil.kr_i('📱 macOS多因子ID - $hash', tag: 'KRDeviceInfoService');

      return hash.toString();
    } catch (e) {
      if (kDebugMode) {
        print('❌ macOS设备ID获取失败: $e');
      }
      KRLogUtil.kr_e('❌ macOS设备ID获取失败 - $e', tag: 'KRDeviceInfoService');
      return '';
    }
  }

  /// Windows设备ID - 使用机器GUID
  /// 🔧 修复：不使用 flutter_udid，因为它会调用 wmic 命令弹出黑窗口
  Future<String> _getWindowsDeviceId() async {
    try {
      final windowsInfo = await _deviceInfo.windowsInfo;

      // 🔧 修复：不使用 FlutterUdid.consistentUdid
      // 因为它在 Windows 上会调用 "cmd.exe /c wmic csproduct get UUID"
      // 这个调用没有使用 CREATE_NO_WINDOW 标志，会弹出黑色命令行窗口

      // 直接使用 device_info_plus 提供的信息构建唯一标识
      // windowsInfo.deviceId 已经是一个稳定的设备标识

      // 构建多因子字符串
      final factors = [
        windowsInfo.deviceId, // 设备ID (最稳定，来自注册表 MachineGuid)
        windowsInfo.computerName, // 计算机名
        windowsInfo.productName, // 产品名
        windowsInfo.numberOfCores.toString(), // CPU核心数
        windowsInfo.systemMemoryInMegabytes.toString(), // 内存大小
      ];

      final combined = factors
          .where((f) => f.isNotEmpty)
          .join('|');

      final bytes = utf8.encode(combined);
      final hash = sha256.convert(bytes);

      if (kDebugMode) {
        print('📱 Windows多因子ID生成 - 因子数: ${factors.where((f) => f.isNotEmpty).length}');
      }
      KRLogUtil.kr_i('📱 Windows多因子ID - $hash', tag: 'KRDeviceInfoService');

      return hash.toString();
    } catch (e) {
      if (kDebugMode) {
        print('❌ Windows设备ID获取失败: $e');
      }
      KRLogUtil.kr_e('❌ Windows设备ID获取失败 - $e', tag: 'KRDeviceInfoService');
      return '';
    }
  }

  /// Linux设备ID - 使用machine-id
  Future<String> _getLinuxDeviceId() async {
    try {
      final linuxInfo = await _deviceInfo.linuxInfo;

      // 优先使用 flutter_udid
      String udid = await FlutterUdid.consistentUdid;

      // 构建多因子字符串
      final factors = [
        udid,
        linuxInfo.machineId ?? '', // Machine ID (最稳定)
        linuxInfo.id, // 发行版ID
        linuxInfo.name, // 发行版名称
        linuxInfo.version ?? '', // 版本
        linuxInfo.variant ?? '', // 变体
      ];

      final combined = factors
          .where((f) => f.isNotEmpty)
          .join('|');

      final bytes = utf8.encode(combined);
      final hash = sha256.convert(bytes);

      if (kDebugMode) {
        print('📱 Linux多因子ID生成 - 因子数: ${factors.where((f) => f.isNotEmpty).length}');
      }
      KRLogUtil.kr_i('📱 Linux多因子ID - $hash', tag: 'KRDeviceInfoService');

      return hash.toString();
    } catch (e) {
      if (kDebugMode) {
        print('❌ Linux设备ID获取失败: $e');
      }
      KRLogUtil.kr_e('❌ Linux设备ID获取失败 - $e', tag: 'KRDeviceInfoService');
      return '';
    }
  }

  /// 获取或创建存储的设备ID
  Future<String> _getOrCreateStoredDeviceId() async {
    try {
      const key = 'kr_device_unique_id';
      final storage = KRSecureStorage();

      String? storedId = await storage.kr_readData(key: key);

      if (storedId == null || storedId.isEmpty) {
        // 生成新的UUID
        storedId = _generateUniqueId();
        await storage.kr_saveData(key: key, value: storedId);
        if (kDebugMode) {
          print('📱 生成新的设备ID: $storedId');
        }
        KRLogUtil.kr_i('📱 生成新的设备ID - $storedId', tag: 'KRDeviceInfoService');
      } else {
        if (kDebugMode) {
          print('📱 使用存储的设备ID: $storedId');
        }
        KRLogUtil.kr_i('📱 使用存储的设备ID - $storedId', tag: 'KRDeviceInfoService');
      }

      return storedId;
    } catch (e) {
      if (kDebugMode) {
        print('❌ 获取存储的设备ID失败: $e');
      }
      KRLogUtil.kr_e('❌ 获取存储的设备ID失败 - $e', tag: 'KRDeviceInfoService');
      return _generateUniqueId();
    }
  }

  /// 生成唯一ID
  String _generateUniqueId() {
    final timestamp = DateTime.now().millisecondsSinceEpoch.toString();
    final random = DateTime.now().microsecondsSinceEpoch.toString();
    final combined = '$timestamp-$random';

    // 使用MD5生成唯一标识
    final bytes = utf8.encode(combined);
    final digest = md5.convert(bytes);

    return digest.toString();
  }

  /// 获取设备详细信息
  Future<Map<String, dynamic>> _getDeviceDetails() async {
    try {
      if (Platform.isAndroid) {
        final androidInfo = await _deviceInfo.androidInfo;
        return {
          'platform': 'android',
          'device': androidInfo.device,
          'model': androidInfo.model,
          'brand': androidInfo.brand,
          'manufacturer': androidInfo.manufacturer,
          'androidId': androidInfo.id,
          'version': androidInfo.version.release,
          'sdkInt': androidInfo.version.sdkInt,
        };
      } else if (Platform.isIOS) {
        final iosInfo = await _deviceInfo.iosInfo;
        return {
          'platform': 'ios',
          'name': iosInfo.name,
          'model': iosInfo.model,
          'systemName': iosInfo.systemName,
          'systemVersion': iosInfo.systemVersion,
          'identifierForVendor': iosInfo.identifierForVendor,
          'isPhysicalDevice': iosInfo.isPhysicalDevice,
        };
      } else if (Platform.isMacOS) {
        final macInfo = await _deviceInfo.macOsInfo;
        return {
          'platform': 'macos',
          'computerName': macInfo.computerName,
          'model': macInfo.model,
          'hostName': macInfo.hostName,
          'arch': macInfo.arch,
          'systemGUID': macInfo.systemGUID,
        };
      } else if (Platform.isWindows) {
        final windowsInfo = await _deviceInfo.windowsInfo;
        return {
          'platform': 'windows',
          'computerName': windowsInfo.computerName,
          'numberOfCores': windowsInfo.numberOfCores,
          'systemMemoryInMegabytes': windowsInfo.systemMemoryInMegabytes,
        };
      } else if (Platform.isLinux) {
        final linuxInfo = await _deviceInfo.linuxInfo;
        return {
          'platform': 'linux',
          'name': linuxInfo.name,
          'version': linuxInfo.version,
          'id': linuxInfo.id,
          'machineId': linuxInfo.machineId,
        };
      } else if (kIsWeb) {
        final webInfo = await _deviceInfo.webBrowserInfo;
        return {
          'platform': 'web',
          'browserName': webInfo.browserName.toString(),
          'userAgent': webInfo.userAgent,
          'vendor': webInfo.vendor,
        };
      }

      return {
        'platform': 'unknown',
      };
    } catch (e) {
      if (kDebugMode) {
        print('❌ 获取设备详情失败: $e');
      }
      KRLogUtil.kr_e('❌ 获取设备详情失败 - $e', tag: 'KRDeviceInfoService');
      return {
        'platform': 'unknown',
        'error': e.toString(),
      };
    }
  }

  /// 获取平台名称
  String getPlatformName() {
    if (Platform.isAndroid) return 'Android';
    if (Platform.isIOS) return 'iOS';
    if (Platform.isMacOS) return 'macOS';
    if (Platform.isWindows) return 'Windows';
    if (Platform.isLinux) return 'Linux';
    if (kIsWeb) return 'Web';
    return 'Unknown';
  }

  /// 获取设备型号
  String getDeviceModel() {
    if (_deviceDetails == null) return 'Unknown';

    if (Platform.isAndroid) {
      return '${_deviceDetails!['brand']} ${_deviceDetails!['model']}';
    } else if (Platform.isIOS) {
      return _deviceDetails!['model'] ?? 'Unknown';
    } else if (Platform.isMacOS) {
      return _deviceDetails!['model'] ?? 'Unknown';
    }

    return 'Unknown';
  }

  /// 获取操作系统版本
  String getOSVersion() {
    if (_deviceDetails == null) return 'Unknown';

    if (Platform.isAndroid) {
      return _deviceDetails!['version'] ?? 'Unknown';
    } else if (Platform.isIOS) {
      return _deviceDetails!['systemVersion'] ?? 'Unknown';
    }

    return 'Unknown';
  }

  /// 获取User-Agent信息
  String getUserAgent() {
    final platform = getPlatformName();
    final model = getDeviceModel();
    final osVersion = getOSVersion();

    return 'HiVPN/1.0.0 ($platform; $model; $osVersion) Flutter';
  }
}