import 'dart:io';

import 'package:dio/dio.dart';
import 'package:dio/io.dart';
import 'package:flutter/foundation.dart';
import 'package:news_app/constant/api_const.dart';
import 'package:news_app/util/toast_util.dart';
import 'package:pretty_dio_logger/pretty_dio_logger.dart';

import '../constant/config.dart';
import '../event/logout_event.dart';
import 'my_exception.dart';

/// @author: bo.zeng
/// @email: cnhbwds@gmail.com
/// @date: 2025 2025/4/9 16:00
/// @description:
class HttpUtil {
  static final HttpUtil _instance = HttpUtil._internal();
  late Dio _dio;

  factory HttpUtil() => _instance;

  HttpUtil._internal() {
    // 初始化 Dio
    _dio = Dio(
      BaseOptions(
        baseUrl: baseUrl,
        // 替换为你的 API 地址
        connectTimeout: const Duration(seconds: 10),
        // 连接超时
        receiveTimeout: const Duration(seconds: 10),
        // 接收超时
        contentType: 'application/json; charset=utf-8',
        responseType: ResponseType.json,
      ),
    );

    // 添加拦截器
    // 拦截器：统一错误处理和 Toast 提示
    _dio.interceptors.add(
      InterceptorsWrapper(
        onRequest: (options, handler) {
          if (uuid.isNotEmpty) {
            options.headers['uuid'] = uuid;
            options.headers['cookie'] = "Authorization-M=$uuid";
          }
          options.headers['Content-Type'] = 'application/json';
          return handler.next(options);
        },
        onError: (DioException e, handler) {
          String errorMessage = "Network Error";
          if (e.response != null) {
            // 尝试从服务器错误响应中提取消息
            errorMessage =
                _parseErrorResponse(e.response?.data) ??
                "Server Error: ${e.response?.statusCode}";
          } else if (e.type == DioExceptionType.connectionTimeout) {
            errorMessage = "Connection Timeout";
          } else if (e.type == DioExceptionType.unknown) {
            errorMessage = "No Internet Connection";
          }

          // 显示 Toast 提示
          _showErrorToast(errorMessage);

          // 继续抛出错误（可选，如果外层需要捕获）
          return handler.next(e);
        },
      ),
    );

    // 处理抓包代理
    if (enableProxy) {
      // 使用 IOHttpClientAdapter（适配 Flutter 环境）
      final adapter = IOHttpClientAdapter();

      adapter.createHttpClient = () {
        final client = HttpClient();

        client.findProxy = (uri) => "PROXY 192.168.3.21:9090;";
        client.badCertificateCallback =
            (X509Certificate cert, String host, int port) => true;

        return client;
      };

      _dio.httpClientAdapter = adapter;
    }

    // 日志拦截器（仅在 Debug 模式下启用）
    if (kDebugMode) {
      _dio.interceptors.add(
        PrettyDioLogger(request: false, requestHeader: true),
      );
    }

    // 开发时设置代理（抓包工具一般默认监听 127.0.0.1:8888）
  }

  /// 解析服务器错误响应
  String? _parseErrorResponse(dynamic responseData) {
    try {
      if (responseData is Map) {
        return responseData['message'] ?? responseData['error'];
      } else if (responseData is String) {
        return responseData;
      }
    } catch (e) {
      return null;
    }
    return null;
  }

  /// 显示错误 Toast
  void _showErrorToast(String message) {
    showToast(message);
  }

  /// GET 请求
  Future<dynamic> get(
    String path, {
    Map<String, dynamic>? queryParameters,
    Options? options,
  }) async {
    try {
      final response = await _dio.get(
        path,
        queryParameters: queryParameters,
        options: options,
      );
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// POST 请求
  Future<dynamic> post(
    String path, {
    dynamic data,
    Map<String, dynamic>? queryParameters,
    Options? options,
  }) async {
    try {
      final response = await _dio.post(
        path,
        data: data,
        queryParameters: queryParameters,
        options: options,
      );
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// PUT 请求
  Future<dynamic> put(
    String path, {
    dynamic data,
    Map<String, dynamic>? queryParameters,
    Options? options,
  }) async {
    try {
      final response = await _dio.put(
        path,
        data: data,
        queryParameters: queryParameters,
        options: options,
      );
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// DELETE 请求
  Future<dynamic> delete(
    String path, {
    dynamic data,
    Map<String, dynamic>? queryParameters,
    Options? options,
  }) async {
    try {
      final response = await _dio.delete(
        path,
        data: data,
        queryParameters: queryParameters,
        options: options,
      );
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// 文件上传
  Future<dynamic> upload(
    String path, {
    required String filePath,
    String? fileName,
    Map<String, dynamic>? data,
    Options? options,
  }) async {
    try {
      final formData = FormData.fromMap({
        'file': await MultipartFile.fromFile(filePath, filename: fileName),
        ...?data,
      });
      final response = await _dio.post(path, data: formData, options: options);
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// 文件下载
  Future<dynamic> download(
    String url,
    String savePath, {
    ProgressCallback? onProgress,
    Options? options,
  }) async {
    try {
      final response = await _dio.download(
        url,
        savePath,
        onReceiveProgress: onProgress,
        options: options,
      );
      return _handleResponse(response);
    } catch (e) {
      return _handleError(e);
    }
  }

  /// 统一处理响应
  dynamic _handleResponse(Response response) {
    if (response.statusCode == 200) {
      final data = response.data;
      if (data is Map && data['code'] != 200) {
        throw MyException(
          code: data['code'],
          msg: data['msg'] ?? 'Unknown Error',
        );
      }
      return data['data'] ?? data;
    } else {
      throw DioException(
        requestOptions: response.requestOptions,
        response: response,
        error: 'Request failed with status: ${response.statusCode}',
      );
    }
  }

  /// 统一处理错误
  dynamic _handleError(dynamic error) {
    if (error is DioException) {
      if (error.response != null) {
        // 服务器返回错误（如 404、500）
        throw 'Server Error: ${error.response?.statusCode}';
      } else {
        // 网络错误（如超时、无网络）
        throw 'Network Error: ${error.message}';
      }
    } else if (error is MyException) {
      if (error.code == 401) {
        eventBus.fire(LogoutEvent(jumLogin: true));
      } else {
        _showErrorToast(error.msg ?? "服务器错误");
      }
      throw error;
    } else {
      throw 'Unknown Error: $error';
    }
  }

  /// 取消请求
  void cancelRequests({CancelToken? token}) {
    token?.cancel('Request cancelled');
  }
}