import 'package:logger/web.dart';
import '../../../data/services/ble_manager.dart';
import '../../../data/models/appconfig.dart';
import '../../../data/models/appconfig_model.dart';
import 'package:get/get.dart';

/// 版本管理服务
/// 负责处理设备版本信息获取、版本比较等功能
class VersionManager {
  final BleManager _bleManager = Get.find<BleManager>();
  final int maxRetryAttempts = 3;
  int currentRetryCount = 0;

  /// 获取当前设备版本信息
  /// 返回包含当前版本、产品ID和设备信息的Map
  /// 抛出异常如果获取失败
  Future<Map<String, dynamic>> getCurrentVersionInfo() async {
    DeviceInfo? deviceInfo = _bleManager.deviceInfo.value;

    // 重试机制获取设备信息
    while (currentRetryCount < maxRetryAttempts) {
      deviceInfo = _bleManager.deviceInfo.value;

      if (deviceInfo != null &&
          deviceInfo.firmwareVersion.isNotEmpty &&
          deviceInfo.firmwareProductId.isNotEmpty) {
        break;
      }

      await _bleManager.fetchDeviceInfo();
      await Future.delayed(const Duration(seconds: 5));
      currentRetryCount++;
    }

    if (deviceInfo == null ||
        deviceInfo.firmwareVersion.isEmpty ||
        deviceInfo.firmwareProductId.isEmpty) {
      throw "获取设备信息失败，请检查连接";
    }

    // 验证固件版本格式
    final firmwareParts = deviceInfo.firmwareVersion.split('.');
    final firstPart = firmwareParts.sublist(0, 3).join('.');
    final secondPart = firmwareParts.sublist(3).join('.');
    
    Logger().d("firstPart: $firstPart, secondPart: $secondPart");
    
    if (firstPart != secondPart) {
      throw "固件版本格式错误：${deviceInfo.firmwareVersion}";
    }

    return {
      'currentVersion': firstPart,
      'productId': deviceInfo.firmwareProductId,
      'deviceInfo': deviceInfo,
    };
  }

  /// 获取最新版本信息
  /// 返回包含最新版本、更新描述和更新包地址的Map
  /// 抛出异常如果获取失败
  Future<Map<String, dynamic>> getLatestVersionInfo() async {
    DBProduct? product = AppConfig.getproduct("DeapSound");
    
    if (product == null) {
      throw "无法获取产品信息";
    }

    return {
      'latestVersion': product.version ?? "",
      'updateDescription': product.updatedescription ?? "",
      'updatePackageAddress': product.updatepackageaddress ?? "",
    };
  }

  /// 比较版本号，判断是否有新版本可用
  /// [currentVersion] 当前版本号
  /// [latestVersion] 最新版本号
  /// 返回true表示有新版本可用（支持升级和降级）
  bool isNewVersionAvailable(String currentVersion, String latestVersion) {
    try {
      List<int> currentParts = currentVersion
          .split('.')
          .map((e) => int.parse(e.trim()))
          .toList();
      List<int> latestParts =
          latestVersion.split('.').map((e) => int.parse(e.trim())).toList();

      // 确保两个版本号长度一致，短的用0补齐
      int maxLength = currentParts.length > latestParts.length
          ? currentParts.length
          : latestParts.length;

      while (currentParts.length < maxLength) {
        currentParts.add(0);
      }
      while (latestParts.length < maxLength) {
        latestParts.add(0);
      }

      // 比较每一段，只要有不同就返回true（支持升级和降级）
      for (int i = 0; i < maxLength; i++) {
        if (latestParts[i] != currentParts[i]) {
          return true;
        }
      }

      return false;
    } catch (e) {
      Logger().d('版本比较错误: $e');
      return false;
    }
  }
}