import 'dart:io';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/foundation.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 {
      print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');
      print('📱 开始初始化设备信息服务');
      print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');
      KRLogUtil.kr_i('📱 开始初始化设备信息', tag: 'KRDeviceInfoService');

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

      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) {
      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
  Future<String> _getDeviceId() async {
    try {
      String? identifier;

      if (Platform.isAndroid) {
        final androidInfo = await _deviceInfo.androidInfo;
        // Android使用androidId作为唯一标识
        identifier = androidInfo.id;
      } else if (Platform.isIOS) {
        final iosInfo = await _deviceInfo.iosInfo;
        // iOS使用identifierForVendor作为唯一标识
        identifier = iosInfo.identifierForVendor;
      } else if (Platform.isMacOS) {
        final macInfo = await _deviceInfo.macOsInfo;
        // macOS使用systemGUID
        identifier = macInfo.systemGUID;
      } else if (Platform.isWindows) {
        final windowsInfo = await _deviceInfo.windowsInfo;
        // Windows使用计算机名作为唯一标识
        identifier = windowsInfo.computerName;
      } else if (Platform.isLinux) {
        final linuxInfo = await _deviceInfo.linuxInfo;
        // Linux使用machineId
        identifier = linuxInfo.machineId;
      } 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 == null || identifier.isEmpty) {
        identifier = await _getOrCreateStoredDeviceId();
      }

      return identifier;
    } catch (e) {
      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();
    }
  }

  /// 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);
        print('📱 生成新的设备ID: $storedId');
        KRLogUtil.kr_i('📱 生成新的设备ID - $storedId', tag: 'KRDeviceInfoService');
      } else {
        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) {
      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) {
      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 'BearVPN/1.0.0 ($platform; $model; $osVersion) Flutter';
  }
}