import 'package:classic_bluetooth/classic_bluetooth.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:path/path.dart';
import 'dart:async';
import '../../../data/services/network/api.dart';
import '../model/ota_upgrade_model.dart';
import 'dart:io';
import 'package:dio/dio.dart';
import 'package:path_provider/path_provider.dart';
import 'package:ota/ota.dart';
import '../../../data/services/ble_manager.dart';

class OtaUpgradeController extends GetxController {
  static const int NOT_STARTED = -1; // 未开始
  static const int VALIDATION_FILE = 0; // 验证文件
  static const int ONUPGRADE = 1; // 升级中
  static const int START_UPGRADING = 2; // 开始升级
  static const int UPGRADE_SUCCESS = 3; // 升级成功
  static const int UPGRADE_FAILED = 4; // 升级失败
  static const int CONNECTION_DISCONNECTION = 5; // 连接断开
  static const int CONNECTION_SUCCESS = 6; // 连接成功
  static const int DOWNLOADING_UP_FILES = 7; // 下载升级文件

// 错误信息，用于存储错误提示
  final RxString errorMessage = ''.obs;

// 最新版本号
  final RxString latestVersion = ''.obs;
  // 最新更新内容
  final RxString updatedescription = ''.obs;

// 当前设备固件版本号
  final RxString currentVersion = ''.obs;

  String _address = '';

// 更新包地址，用于下载更新文件
  String updatepackageaddress = '';

// 下载进度，范围为 0.0 到 1.0
  final RxDouble downloadProgress = 0.0.obs;

// 是否有可用更新的状态
  final isUpdateAvailable = true.obs;

// 当前升级进度，范围为 0.0 到 1.0
  // final RxDouble progress = 0.0.obs;

// OTA 单例实例，用于处理升级相关逻辑
  final jlota = Ota.instance;

// 是否正在下载更新包的状态
  final RxBool isDownloading = false.obs;

// 蓝牙管理服务，用于获取设备信息和通信
  final _bleManager = Get.find<BleManager>();
  final maxRetryAttempts = 3; // 最大重试次数
  int currentRetryCount = 0;

  final RxBool isFetchingDeviceInfo = true.obs;

  final RxDouble progress = 0.0.obs; // 控制器自己的可观察属性
  final RxInt type = OtaEvent.NOT_STARTED.obs;
  final RxBool isUpgrade = false.obs;

  @override
  void onInit() {
    super.onInit();
    _getCurrentVersion();
  }

  @override
  void onClose() {
    jlota.onOtaClose();
    _bleManager.setEnterOta(false);
    isUpgrade.value = false;
    super.onClose();
  }

  // 添加重试方法
  void retryConnection() {
    errorMessage.value = '';
    _getCurrentVersion();
  }

  String getStatusMessage(int type) {
    switch (type) {
      case NOT_STARTED: // -1
        return "未开始".tr;
      case VALIDATION_FILE: // 0
        return "验证文件中".tr;
      case ONUPGRADE: // 1
        return "升级中".tr;
      case START_UPGRADING: // 2
        return "开始升级".tr;
      case UPGRADE_SUCCESS: // 3
        return "升级成功".tr;
      case UPGRADE_FAILED: // 4
        return "升级失败".tr;
      case CONNECTION_DISCONNECTION: // 5
        return "连接断开".tr;
      case CONNECTION_SUCCESS: // 6
        return "连接成功".tr;
      case DOWNLOADING_UP_FILES: // 7 (新增)
        return "下载升级文件".tr;
      default:
        return "未知状态".tr; // 更安全的默认值
    }
  }

  // 添加更新方法
  Future<void> startUpdate() async {
    try {
      checkUpdate();

      // 实现更新逻辑...
    } catch (e) {
      errorMessage.value = e.toString();
      Get.snackbar('更新失败', e.toString());
    }
  }

  Future<void> _getCurrentVersion() async {
    _listenToEvents();
    try {
      isFetchingDeviceInfo.value = true;
      errorMessage.value = '';
      // 添加获取设备信息的重试机制
      DeviceInfo? deviceInfo = _bleManager.deviceInfo.value;

      // // 第一次检查设备信息
      // if (deviceInfo == null) {
      //   // 尝试重新获取设备信息
      //   await _bleManager.fetchDeviceInfo();
      // }

      while (currentRetryCount < maxRetryAttempts) {
        deviceInfo = _bleManager.deviceInfo.value;

        // 检查信息有效性
        if (deviceInfo != null &&
            deviceInfo.firmwareVersion.isNotEmpty &&
            deviceInfo.firmwareProductId.isNotEmpty) {
          break;
        }

        // 获取设备信息
        await _bleManager.fetchDeviceInfo();
        await Future.delayed(const Duration(seconds: 5));
        currentRetryCount++;
      }
      // 最终验证
      if (deviceInfo == null ||
          deviceInfo.firmwareVersion.isEmpty ||
          deviceInfo.firmwareProductId.isEmpty) {
        throw "获取设备信息失败，请检查连接";
      }
      // 拆分 firmwareVersion 并判断两边是否一致
      final firmwareParts = deviceInfo.firmwareVersion.split('.');

      // 从第三个 `.` 开始分割
      final firstPart = firmwareParts.sublist(0, 3).join('.');
      final secondPart = firmwareParts.sublist(3).join('.');
      print("firstPart${firstPart},secondPart=${secondPart}");
      // 判断两部分是否一致
      if (firstPart != secondPart) {
        throw "固件版本格式错误：${deviceInfo.firmwareVersion}";
      }

      // 正常流程
      currentVersion.value = firstPart;
      print('getequipmentinfo,id: ${deviceInfo.firmwareProductId}');

      final connectedDevices = await ClassicBluetooth.getConnectedDevices();
      if (connectedDevices.isNotEmpty) {
        _address = connectedDevices.first.address;
      }

      await _bleManager.setEnterOta(true);

      await Future.delayed(const Duration(seconds: 2));

      jlota.init();

      // API请求
      final response = await Api.getequipmentinfo({
        "id": deviceInfo.firmwareProductId,
      });

      // 处理API响应
      if (response['info'] == null) {
        throw const FormatException('API 响应格式错误');
      }

      final resp = OtaConfigResp.fromJson(response);
      print('getequipmentinfo,resp.systemversion: ${resp.systemversion}');
      latestVersion.value = resp.systemversion!;
      updatedescription.value = resp.updatedescription!;
      updatepackageaddress = resp.updatepackageaddress!;

      // 版本检查
      isUpdateAvailable.value = _isNewVersionAvailable(resp.systemversion!);
    } catch (e) {
      // 统一错误处理
      errorMessage.value = e.toString();
      Get.snackbar('错误', e.toString(),
          snackPosition: SnackPosition.BOTTOM,
          backgroundColor: Colors.red,
          colorText: Colors.white);
      // 重要：重新抛出异常以便上层处理（可选）
    } finally {
      isFetchingDeviceInfo.value = false;
    }
  }

  // 版本比较方法优化
  bool _isNewVersionAvailable(String latest) {
    try {
      List<int> currentParts = currentVersion.value
          .split('.')
          .map((e) => int.parse(e.trim()))
          .toList();
      List<int> latestParts =
          latest.split('.').map((e) => int.parse(e.trim())).toList();

      for (int i = 0; i < latestParts.length; i++) {
        int current = (i < currentParts.length) ? currentParts[i] : 0;
        if (latestParts[i] > current) return true;
        if (latestParts[i] < current) return false;
      }
      return false;
    } catch (e) {
      print('版本比较错误: $e');
      return false;
    }
  }

  // 版本更新
  Future<void> checkUpdate() async {
    try {
      if (latestVersion.value != "") {
        _showUpdateDialog(latestVersion.value);
      } else {
        Get.snackbar('错误', '获取最新版本信息失败');
      }
    } catch (e) {
      Get.snackbar('错误', '获取版本信息失败');
    }
  }

  void _showUpdateDialog(String latest) async {
    print('显示更新对话框');
    Get.dialog(
      AlertDialog(
        title: Text('发现新版本 $latest'),
        content: Text('是否立即更新？'),
        actions: [
          TextButton(
            onPressed: () async {
              print('取消按钮被点击');

              Get.back();
              Future.delayed(Duration(milliseconds: 300));
            },
            child: Text('取消'),
          ),
          TextButton(
            onPressed: () async {
              print('更新按钮被点击');

              Get.back();
              Future.delayed(Duration(milliseconds: 300));
              startDownload();
            },
            child: Text('更新'),
          ),
        ],
      ),
    );
  }

// 修改后的startDownload方法
  Future<void> startDownload() async {
    isDownloading.value = true;
    int lastIndex = updatepackageaddress.lastIndexOf('/');
    String fileName = updatepackageaddress.substring(lastIndex + 1);
    String directoryName = "ota_upgrades";

    final dio = Dio(BaseOptions(
      connectTimeout: const Duration(seconds: 5),
      receiveTimeout: Duration.zero,
      sendTimeout: const Duration(seconds: 5),
      headers: {'Accept-Encoding': 'gzip'},
    ));

    type.value = DOWNLOADING_UP_FILES;
    try {
      final Directory? downloadsDir = await getApplicationSupportDirectory();
      if (downloadsDir == null) {
        throw FileSystemException('无法访问下载目录');
      }

      final targetDir =
          Directory('${downloadsDir.path}/Download/$directoryName');
      if (!await targetDir.exists()) {
        await targetDir.create(recursive: true);
      }

      final savePath = '${targetDir.path}/$fileName';

      // 新增：检查同名文件逻辑
      bool existingSameFile = false;
      try {
        var files = await targetDir.list().toList();
        for (var entity in files) {
          if (await FileSystemEntity.isFile(entity.path)) {
            String name = basename(entity.path); // 使用path包中的basename
            if (name == fileName) {
              existingSameFile = true;
              break;
            }
          }
        }
      } catch (e) {
        Get.snackbar('错误', '检查本地文件失败: $e');

        return;
      }

      if (existingSameFile) {
        //Get.snackbar('文件已存在', '跳过下载，直接更新');

        startUpgrading(savePath);
        return;
      }

      // 新增：删除其他文件逻辑
      try {
        var files = await targetDir.list().toList();
        for (var entity in files) {
          if (await FileSystemEntity.isFile(entity.path)) {
            await entity.delete();
          }
        }
      } catch (e) {
        Get.snackbar('错误', '删除旧文件失败: $e');
        //isUpgrade.value = false;
        return;
      }

      print('文件保存路径: $savePath');

      final options = Options(
        receiveTimeout: Duration.zero,
        followRedirects: true,
        maxRedirects: 5,
      );
      // 修改下载部分
      await dio.download(
        updatepackageaddress,
        savePath,
        options: options,
        onReceiveProgress: (received, total) {
          if (total != -1) {
            downloadProgress.value = received / total;
          }
        },
      );
      File file = File(savePath);
      if (await file.exists()) {
        // Get.snackbar('下载完成', '文件已保存至: $savePath');
      } else {
        Get.snackbar('错误', '文件未找到，请检查写入权限');
      }
      isDownloading.value = false;
      startUpgrading(savePath);
      return;
    } on DioException catch (e) {
      Get.snackbar('下载失败', '错误: ${e.message}');
    } on FileSystemException catch (e) {
      Get.snackbar('存储失败', '无法写入文件: ${e.message}');
    } catch (e) {
      Get.snackbar('未知错误', e.toString());
    }
  }

  // 开始升级
  void startUpgrading(String path) async {
    jlota.startUpgrading(address: _address, filePath: path);
    return;
    // isUpgrade.value = false;
  }

  // 停止升级
  void stopUpgrading() async {
    jlota.onOtaClose();
    return;
    // isUpgrade.value = false;
  }

  void _listenToEvents() {
    Ota.instance.eventStream.listen((event) {
      if (event.event == 'onProgress' &&
          event.type != null &&
          event.progress != null) {
        progress.value = event.progress!;
        type.value = event.type!;
        isUpgrade.value = true; // 开始升级
      }
      if (event.event == 'onStartOTA') {
        type.value = OtaEvent.START_UPGRADING;
        isUpgrade.value = true; // 开始升级
      }
      if (event.event == 'onStopOTA') {
        type.value = OtaEvent.UPGRADE_SUCCESS;
        isUpgrade.value = false;
        Get.snackbar('升级成功', '请退出重新连接设备');
        _getCurrentVersion();
      }
      if (event.event == 'onError') {
        type.value = OtaEvent.UPGRADE_FAILED;
        isUpgrade.value = false;
        Get.snackbar('升级失败', '请检查设备连接或升级包，错误码：${event.code}');
      }
      if (event.event == 'NOCONNECTION') {
        type.value = OtaEvent.CONNECTION_DISCONNECTION;
        isUpgrade.value = false;
      }
      if (event.event == 'CONNECTION_SUCCESS') {
        type.value = OtaEvent.CONNECTION_SUCCESS;
        isUpgrade.value = true; // 开始升级
      }
    });
  }
}