import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter/foundation.dart'; // 引入 kDebugMode 和 debugPrint
import 'package:get/get.dart' hide FormData, MultipartFile;
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';
import 'package:problem_check_system/core/extensions/http_response_extension.dart';
import 'package:problem_check_system/core/utils/constants/api_endpoints.dart';
import 'package:problem_check_system/data/models/image_metadata_model.dart';
import 'package:problem_check_system/data/models/image_status.dart';
import 'package:problem_check_system/data/providers/http_provider.dart';

class FileRepository {
  final HttpProvider _httpProvider = Get.find<HttpProvider>();

  /// @param imageFilePath 要上传的本地图片文件。
  /// @param cancelToken 用于取消上传任务的令牌。
  /// @param onSendProgress 上传进度回调，提供已发送和总大小。
  /// @return 上传成功后服务器返回的图片 URL。
  Future<String> uploadImage(
    String imageFilePath, {
    required CancelToken cancelToken,
    ProgressCallback? onSendProgress,
  }) async {
    try {
      // 1. 创建 FormData 对象，用于构建 multipart/form-data 请求体
      final formData = FormData.fromMap({
        // 'file': 这通常是后端接口定义的文件字段名
        'file': await MultipartFile.fromFile(
          imageFilePath,
          filename: p.basename(imageFilePath),
        ),
      });

      // 2. 使用 HttpProvider 的 post 方法发送请求
      final response = await _httpProvider.post(
        ApiEndpoints.postUploadFile,
        data: formData,
        cancelToken: cancelToken, // 将取消令牌传递给 post 请求
        onSendProgress: onSendProgress, // 将进度回调传递给 post 请求
      );

      // --- 在这里打印服务器的完整响应结构 (仅在调试模式下) ---
      if (kDebugMode) {
        debugPrint('服务器返回的状态码: ${response.statusCode}');
        debugPrint('服务器返回的原始数据: ${response.data}');
      }

      // 3. 处理响应，并返回图片 URL
      if (response.isSuccess) {
        final Map<String, dynamic> data = response.data;

        // 假设服务器返回的图片 URL 字段名为 'url'
        String imageUrl = data['fileName'];

        return imageUrl;
      } else {
        throw Exception('上传失败，状态码: ${response.statusCode}');
      }
    } on DioException catch (e) {
      Get.log('图片上传发生未知错误: $e');
      throw Exception('图片上传失败: ${e.message}');
    } catch (e) {
      Get.log('图片上传发生未知错误: $e');
      throw Exception('图片上传发生未知错误: $e');
    }
  }

  // 新增的下载方法
  Future<ImageMetadata> downloadImage(
    String imageUrl, {
    CancelToken? cancelToken,
    void Function(int received, int total)? onReceiveProgress,
  }) async {
    final directory = await getApplicationDocumentsDirectory();
    final imagesDir = Directory('${directory.path}/problem_images');

    // 确保目录存在
    if (!await imagesDir.exists()) {
      await imagesDir.create(recursive: true);
    }

    // 生成唯一的文件名
    final String fileName =
        'downloaded_${DateTime.now().millisecondsSinceEpoch}_${imageUrl.hashCode}${_getFileExtension(imageUrl)}';
    final String imagePath = '${imagesDir.path}/$fileName';

    try {
      // 下载图片
      await _httpProvider.download(
        imageUrl,
        imagePath,
        cancelToken: cancelToken,
        onReceiveProgress: onReceiveProgress,
      );

      // 返回图片元数据
      return ImageMetadata(
        localPath: imagePath,
        remoteUrl: imageUrl,
        status: ImageStatus.synced,
      );
    } catch (e) {
      // 清理可能创建的不完整文件
      final file = File(imagePath);
      if (await file.exists()) {
        await file.delete();
      }
      rethrow;
    }
  }

  // 批量下载方法
  Future<List<ImageMetadata>> downloadImages(
    List<String> imageUrls, {
    CancelToken? cancelToken,
    void Function(int current, int total)? onProgress,
  }) async {
    final List<ImageMetadata> results = [];
    int downloadedCount = 0;

    for (final imageUrl in imageUrls) {
      if (cancelToken?.isCancelled == true) {
        break;
      }

      try {
        final metadata = await downloadImage(
          imageUrl,
          cancelToken: cancelToken,
          onReceiveProgress: (received, total) {
            // 单个文件的进度可以在这里处理
          },
        );
        results.add(metadata);

        // 更新总体进度
        downloadedCount++;
        onProgress?.call(downloadedCount, imageUrls.length);
      } catch (e) {
        Get.log('Failed to download image $imageUrl: $e');
        // 可以选择继续下载其他图片或抛出异常
      }
    }

    return results;
  }

  // 辅助方法：获取文件扩展名
  String _getFileExtension(String url) {
    try {
      final uri = Uri.parse(url);
      final pathSegments = uri.pathSegments;
      if (pathSegments.isNotEmpty) {
        final fileName = pathSegments.last;
        final dotIndex = fileName.lastIndexOf('.');
        if (dotIndex != -1 && dotIndex < fileName.length - 1) {
          return fileName.substring(dotIndex);
        }
      }
      return '.jpg';
    } catch (e) {
      return '.jpg';
    }
  }
}