import 'dart:io';
import 'dart:math' as math;

import 'package:get/get.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:logger/logger.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import '../models/channel_app_model.dart';
import 'network/api.dart';

/// 版本更新服务类
class VersionUpdateService extends GetxService {
  static VersionUpdateService get to => Get.find();

  // 静态应用信息（内存缓存）
  static String? _appVersion = ""; //应用版本号
  static String? _buildNumber = ""; //构建号
  static String? _platform = ""; //平台类型
  static String? _deviceBrand = ""; //设备品牌
  static UserChannel? _channel; //渠道
  static String? _latestVersion = ""; //最新版本号+构建号
  static bool? _hasUpdate = false; //是否有更新
  static bool? _isForceUpdate = false; //是否强制更新
  static String? _updateUrl = ""; //更新链接
  static AppInfo? _appInfo; //应用信息
  static bool? _isShowTourists = false; //是否显示游客登录
  static DateTime? _lastCheckTime; //上次检查时间
  static const int _cacheIntervalMinutes = 10; // 可配置化
  static final String? _countryCode = Get.deviceLocale?.countryCode; //国家地区编码
  static final String? _languageCode = Get.deviceLocale?.languageCode; //语言编码
  // ignore: non_constant_identifier_names
  static final String? _SERVER_URL = (_countryCode == 'CN')
      ? dotenv.env['SERVER_URL']
      : dotenv.env['HW_SERVER_URL']; //服务器地址

  // 添加 getter 方法来访问缓存的静态数据
  /// 获取缓存的应用版本
  String get cachedAppVersion => _appVersion ?? '';

  /// 获取缓存的构建号
  String get cachedBuildNumber => _buildNumber ?? '';

  /// 获取缓存的平台信息
  String get cachedPlatform => _platform ?? '';

  /// 获取缓存的设备品牌
  String get cachedDeviceBrand => _deviceBrand ?? '';

  /// 获取缓存的渠道信息
  UserChannel get cachedChannel =>
      _channel ??
      (_platform?.toLowerCase() == 'ios'
          ? UserChannel.GLOBAL_APPLE
          : UserChannel.GLOBAL_GOOGLE);

  /// 获取缓存的最新版本
  String get cachedLatestVersion => _latestVersion ?? '';

  /// 获取缓存的是否有更新
  bool get cachedHasUpdate => _hasUpdate ?? false;

  /// 获取缓存的是否强制更新
  bool get cachedIsForceUpdate => _isForceUpdate ?? false;

  /// 获取缓存的更新地址
  String get cachedUpdateUrl => _updateUrl ?? '';

  /// 获取缓存的应用信息
  AppInfo? get cachedAppInfo => _appInfo;

  /// 获取缓存的游客登录状态
  bool get cachedShowTourists => _isShowTourists ?? false;

  /// 获取上次检查时间
  DateTime? get lastCheckTime => _lastCheckTime;

  /// 获取缓存的国家地区编码
  String get cachedCountryCode => _countryCode ?? '';

  /// 获取缓存的语言编码
  String get cachedLanguageCode => _languageCode ?? '';

  /// 获取缓存的服务器地址
  String get cachedServerUrl => _SERVER_URL ?? '';

  final Logger _logger = Logger();

  // @override
  // void onInit() {
  //   getCurrentVersion();
  //   getCurrentPlatformInfo();
  //   super.onInit();
  // }

  /// 检查版本更新
  Future<VersionUpdateInfo> checkForUpdate() async {
    if (_lastCheckTime != null &&
        DateTime.now().difference(_lastCheckTime!).inMinutes <
            _cacheIntervalMinutes) {
      // [1]没有超过10分钟，返回缓存数据
      _logger.d('没有超过10分钟，返回缓存数据');
      return VersionUpdateInfo(
        hasUpdate: _hasUpdate ?? false,
        currentVersion: _appVersion ?? '1.0.0',
        latestVersion: (_latestVersion ?? '1.0.0').split('+')[0],
        appInfo: _appInfo,
        updateType: _hasUpdate!
            ? (_isForceUpdate! ? UpdateType.force : UpdateType.optional)
            : UpdateType.none,
      );
    }

    try {
      final currentVersion = await getCurrentVersion();
      final platformInfo = await getCurrentPlatformInfo();

      _platform = platformInfo.platform;
      _channel = platformInfo.channel;
      _lastCheckTime = DateTime.now();

      // 调用后端接口获取最新版本信息
      final response =
          await Api.getChannelApp({'channel': platformInfo.channel.value});

      _logger.d('lxm--获取渠道包信息：$response');

      if (response == null || !response.containsKey('app')) {
        //[2]获取渠道包信息失败: 响应为空或不包含app字段
        _logger.w('获取渠道包信息失败: 响应为空或不包含app字段');
        return VersionUpdateInfo(
          hasUpdate: false,
          currentVersion: currentVersion,
          latestVersion: currentVersion,
          updateType: UpdateType.none,
        );
      }

      //final channelAppResponse = ChannelAppResponse.fromJson(response);
      // 直接从response中获取app信息
      final appInfo = AppInfo.fromJson(response['app']);
      _appInfo = appInfo;
      _logger.d('获取到的最新版本信息: ${appInfo.toJson()}');
      _latestVersion = appInfo.version;
      _updateUrl = appInfo.address;

      // 设置游客登录显示状态（先用当前渠道结果作为回退，再用.env渠道覆盖以保持一致）
      _isShowTourists = appInfo.tourists;
      if (Platform.isAndroid && _channel != platformInfo.channel) {
        //[4]当前渠道与.env渠道不同，需要从.env渠道获取游客登录配置
        await _refreshTouristsFromEnv();
      }

      _logger.d('从服务器获取游客登录配置(最终): ${_isShowTourists}');

      // if (channelAppResponse.code != 0 || channelAppResponse.data == null) {
      //   _logger.w('获取版本信息失败: ${channelAppResponse.msg}');
      //   return VersionUpdateInfo(
      //     hasUpdate: false,
      //     currentVersion: currentVersion,
      //     latestVersion: currentVersion,
      //     updateType: UpdateType.none,
      //   );
      // }

      // final appInfo = channelAppResponse.data!.app;
      _hasUpdate = _compareVersions(currentVersion, appInfo.version);

      // 判断更新类型：如果主版本号不同则强制更新
      UpdateType updateType = UpdateType.none;
      if (_hasUpdate!) {
        _isForceUpdate = _shouldForceUpdate(currentVersion, appInfo.version);
        updateType = _isForceUpdate! ? UpdateType.force : UpdateType.optional;
      }
      //[3]返回版本更新信息
      return VersionUpdateInfo(
        hasUpdate: _hasUpdate!,
        currentVersion: currentVersion.split('+')[0],
        latestVersion: appInfo.version.split('+')[0],
        appInfo: appInfo,
        updateType: updateType,
      );
    } catch (e) {
      _logger.e('检查版本更新失败: $e');
      // 发生错误时，保持默认值 false
      _isShowTourists = false;
      final currentVersion = await getCurrentVersion();
      return VersionUpdateInfo(
        hasUpdate: false,
        currentVersion: currentVersion,
        latestVersion: currentVersion,
        updateType: UpdateType.none,
      );
    }
  }

  /// 获取当前应用版本信息
  Future<String> getCurrentVersion() async {
    try {
      final packageInfo = await PackageInfo.fromPlatform();
      _appVersion = packageInfo.version;
      _buildNumber = packageInfo.buildNumber;
      return '${packageInfo.version}+${packageInfo.buildNumber}';
    } catch (e) {
      _logger.e('获取当前版本信息失败: $e');
      return '1.0.0';
    }
  }

  /// 获取当前平台信息
  Future<PlatformInfo> getCurrentPlatformInfo() async {
    if (Platform.isIOS) {
      return const PlatformInfo(
        platform: 'ios',
        storeType: AppStoreType.appStore,
        channel: UserChannel.GLOBAL_APPLE,
      );
    }

    if (Platform.isAndroid) {
      // 根据设备品牌判断应用商店类型
      return await getAndroidStoreInfoByBrand();
    }

    return const PlatformInfo(
      platform: 'unknown',
      storeType: AppStoreType.unknown,
      channel: UserChannel.UNKNOWN,
    );
  }

  /// 根据设备品牌获取应用商店信息
  ///
  /// 该方法根据设备品牌判断应用商店类型，并返回对应的 [PlatformInfo] 对象。
  /// 如果品牌不在预设列表中，将使用环境变量 [Channel] 或默认值 [UserChannel.GLOBAL_GOOGLE]。
  Future<PlatformInfo> getAndroidStoreInfoByBrand() async {
    try {
      final deviceInfo = DeviceInfoPlugin();
      final androidInfo = await deviceInfo.androidInfo;
      final brand = androidInfo.brand.toLowerCase();

      _deviceBrand = brand;
      String channelFromEnv = dotenv.env['Channel'] ?? 'OFFICIAL';
      Logger().d('channelFromEnv: $channelFromEnv');
      _channel = UserChannel.fromName(channelFromEnv);

      UserChannel brandChannel; //品牌渠道,只用于请求版本更新信息

      switch (brand) {
        case 'huawei':
          brandChannel = UserChannel.CHINA_HUAWEI;
          break;
        case 'xiaomi':
        case 'redmi':
          brandChannel = UserChannel.CHINA_XIAOMI;
          break;
        case 'oppo':
        case 'oneplus':
          brandChannel = UserChannel.CHINA_OPPO;
          break;
        case 'vivo':
        case 'iqoo':
          brandChannel = UserChannel.CHINA_VIVO;
          break;
        case 'honor':
          brandChannel = UserChannel.CHINA_HONOR;
          break;
        default:
          brandChannel = _channel ?? UserChannel.GLOBAL_GOOGLE;
          break;
      }

      return PlatformInfo(
        platform: 'android',
        storeType: AppStoreType.official,
        channel: brandChannel,
      );
    } catch (e) {
      _logger.e('获取Android设备信息失败: $e');
      return const PlatformInfo(
        platform: 'android',
        storeType: AppStoreType.googlePlay,
        channel: UserChannel.UNKNOWN,
      );
    }
  }

  /// 从.env文件刷新游客登录配置
  Future<void> _refreshTouristsFromEnv() async {
    try {
      final envChannelName = dotenv.env['Channel'];
      if (envChannelName == null || envChannelName.isEmpty) {
        _logger.w('未配置.env Channel，沿用当前渠道的游客配置: ${_isShowTourists}');
        return;
      }
      final envChannel = UserChannel.fromName(envChannelName);

      final resp = await Api.getChannelApp({'channel': envChannel.value});
      if (resp != null && resp.containsKey('app')) {
        final envAppInfo = AppInfo.fromJson(resp['app']);
        _isShowTourists = envAppInfo.tourists;
        _logger.d(
            '游客登录配置已按.env渠道同步: ${envAppInfo.tourists} (channel=$envChannelName)');
      } else {
        _logger.w('按.env渠道获取游客配置失败：响应为空或不含app字段');
      }
    } catch (e) {
      _logger.w('按.env渠道同步游客配置失败: $e');
    }
  }

  /// 判断是否需要强制更新
  /// 当主版本号（第一位数字）不同时返回true
  bool _shouldForceUpdate(String current, String latest) {
    try {
      // 拆分版本号与构建号
      final currentParts = current.split('+');
      final latestParts = latest.split('+');

      // 解析版本号 (major.minor.patch)
      final currentVersions =
          currentParts[0].split('.').map(int.parse).toList();
      final latestVersions = latestParts[0].split('.').map(int.parse).toList();

      // 比较主版本号（第一位）
      if (currentVersions.isNotEmpty && latestVersions.isNotEmpty) {
        if (currentVersions[0] != latestVersions[0]) {
          return true;
        }
      }

      // 检查是否有两个或更多的 + 号，如果有则强制更新
      if (latest.split('+').length > 2) {
        return true;
      }

      return false;
    } catch (e) {
      _logger.e('判断强制更新失败: $e');
      return false;
    }
  }

  /// 比较版本号
  /// 返回true表示需要更新（远程版本更高）
  bool _compareVersions(String current, String latest) {
    // 拆分版本号与构建号
    final currentParts = current.split('+')[0];
    final latestParts = latest.split('+')[0];

    // 解析版本号 (major.minor.patch)
    final currentVersions = currentParts.split('.').map(int.parse).toList();
    final latestVersions = latestParts.split('.').map(int.parse).toList();

    // 使用较小的长度进行比较，避免索引越界
    final minLength = math.min(currentVersions.length, latestVersions.length);

    // 逐级比较版本号
    for (var i = 0; i < minLength; i++) {
      if (latestVersions[i] > currentVersions[i]) return true;
      if (latestVersions[i] < currentVersions[i]) return false;
    }

    // 如果前面的版本号都相同，比较长度
    // 更长的版本号被认为是更新的版本（如 1.0.1 > 1.0）
    return latestVersions.length > currentVersions.length;
  }

  /// 解析版本号字符串为数字数组
  List<int> _parseVersion(String version) {
    final parts = version.split('.');
    final result = <int>[];

    for (int i = 0; i < 3; i++) {
      if (i < parts.length) {
        result.add(int.tryParse(parts[i]) ?? 0);
      } else {
        result.add(0);
      }
    }

    return result;
  }

  /// 执行更新操作
  Future<bool> performUpdate(VersionUpdateInfo updateInfo) async {
    //print('lxm---updateInfo详情:');
    //print('lxm---hasUpdate: ${updateInfo.hasUpdate}');
    //print('lxm---currentVersion: ${updateInfo.currentVersion}');
    //print('lxm---latestVersion: ${updateInfo.latestVersion}');
    //print('lxm---updateType: ${updateInfo.updateType}');
    //print('lxm---appInfo: ${updateInfo.appInfo?.toJson()}');
    if (!updateInfo.hasUpdate || updateInfo.appInfo == null) {
      return false;
    }

    try {
      _logger.d('lxm---执行更新操作，下载地址: ${updateInfo.appInfo!.address}');
      return await _openDownloadUrl(updateInfo.appInfo!.address!);
    } catch (e) {
      _logger.e('执行更新失败: $e');
      return false;
    }
  }

  /// 打开下载链接
  Future<bool> _openDownloadUrl(String downloadUrl) async {
    return await _launchUrl(downloadUrl);
  }

  /// 启动URL
  Future<bool> _launchUrl(String url) async {
    try {
      final uri = Uri.parse(url);
      if (await canLaunchUrl(uri)) {
        return await launchUrl(uri, mode: LaunchMode.externalApplication);
      }
      return false;
    } catch (e) {
      _logger.e('启动URL失败: $e');
      return false;
    }
  }
}