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 '../../../data/services/ble_manager.dart';

class OtaUpgradeController extends GetxController {
  final RxString errorMessage = ''.obs;
  final RxBool isFetchingDeviceInfo = false.obs;
  final Dio _dio = Dio();
  final RxString latestVersion = ''.obs;
  final RxString currentVersion = ''.obs;
  String updatepackageaddress = '';
  final RxDouble downloadProgress = 0.0.obs;
  final RxBool isUpdating = false.obs;
  final isUpdateAvailable = true.obs;

  final RxDouble progress = 0.0.obs;

  // 蓝牙服务
  final _bleManager = Get.find<BleManager>();
  @override
  void onInit() {
    super.onInit();
    _getCurrentVersion();
  }

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

  // 添加更新方法
  Future<void> startUpdate() async {
    try {
      isUpdating.value = true;
      // 实现更新逻辑...
    } catch (e) {
      errorMessage.value = e.toString();
      Get.snackbar('更新失败', e.toString());
    } finally {
      isUpdating.value = false;
    }
  }

  Future<void> _getCurrentVersion() async {
    try {
      // 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) {
        // 显示加载提示
        isFetchingDeviceInfo.value = true;

        // 尝试重新获取设备信息
        await _bleManager.fetchDeviceInfo();

        // 等待后再次获取设备信息
        deviceInfo = _bleManager.deviceInfo.value;
        isFetchingDeviceInfo.value = false;

        // 仍然为空则抛出异常
        if (deviceInfo == null) {
          throw const FormatException('无法获取设备信息，请检查设备连接');
        }
      }

      // 检查固件信息有效性
      if (deviceInfo.firmwareVersion.isEmpty
          //||
          //     deviceInfo.firmwareProductId.isEmpty
          ) {
        throw const FormatException('设备固件信息不完整');
      }

      // 正常流程
      currentVersion.value = deviceInfo.firmwareVersion;

      // API请求
      final response = await Api.getequipmentinfo({
        "id": "a2",
      });

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

      final resp = OtaConfigResp.fromJson(response);
      latestVersion.value = resp.systemversion!;
      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');
    }
  }

  // 显示更新对话框
  void _showUpdateDialog(String latest) {
    Get.dialog(
      AlertDialog(
        title: Text('发现新版本 $latest'),
        content: Text('是否立即更新？'),
        actions: [
          TextButton(
            onPressed: () => Get.back(),
            child: Text('取消'),
          ),
          TextButton(
            onPressed: () {
              Get.back();
              startDownload();
            },
            child: Text('更新'),
          ),
        ],
      ),
    );
  }

// 修改后的startDownload方法
  Future<void> startDownload() async {
    isUpdating.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'},
    ));

    Get.snackbar('升级命令已发送', '开始下载...');

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

      final targetDir = Directory('${downloadsDir.path}/$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');
        isUpdating.value = false;
        return;
      }

      if (existingSameFile) {
        Get.snackbar('文件已存在', '跳过下载，直接更新');
        isUpdating.value = false;
        _installApp(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');
        isUpdating.value = false;
        return;
      }

      print('文件保存路径: $savePath');

      final options = Options(
        receiveTimeout: Duration.zero,
        followRedirects: true,
        maxRedirects: 5,
      );

      DateTime lastUpdate = DateTime.now();
      await dio.download(
        updatepackageaddress,
        savePath,
        options: options,
        onReceiveProgress: (received, total) {
          final now = DateTime.now();
          if (now.difference(lastUpdate).inMilliseconds > 1000) {
            lastUpdate = now;
            String progressMsg = total != -1
                ? '${(received / total * 100).toStringAsFixed(1)}%'
                : '已下载：${(received / 1024 / 1024).toStringAsFixed(1)}MB';
            Get.snackbar(
              '升级进度',
              progressMsg,
              duration: const Duration(seconds: 1),
            );
          }
        },
      );

      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');
      }
      isUpdating.value = false;
      _installApp(savePath);
    } on DioException catch (e) {
      Get.snackbar('下载失败', '错误: ${e.message}');
      isUpdating.value = false;
    } on FileSystemException catch (e) {
      Get.snackbar('存储失败', '无法写入文件: ${e.message}');
      isUpdating.value = false;
    } catch (e) {
      Get.snackbar('未知错误', e.toString());
      isUpdating.value = false;
    }
  }

  // 开始升级
  void _installApp(String path) async {
    // final File file = File(path);
    // if (await file.exists()) {
    //   // OpenResult result = await OpenFile.open(path);
    //   // if (result.type != ResultType.done) {
    //   //   Get.snackbar('错误', '安装失败: ${result.message}');
    //   // }
    // }
  }
}