import 'package:dio/dio.dart';
import 'package:dio/io.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:get/get.dart' hide Response;
import 'package:flutter/foundation.dart';
import 'dart:io';
import 'package:path/path.dart' as p;

import 'auth_interceptor.dart';
import 'nw_method.dart';

class DioManager {
  static final DioManager _shared = DioManager._internal();
  factory DioManager() => _shared;

  late Dio dio;
  // 根据地区获取服务器URL
  String get baseUrl {
    final countryCode = Get.deviceLocale?.countryCode?.toUpperCase();
    final isChinaMainland = countryCode == 'CN';

    if (!isChinaMainland) {
      return dotenv.env['HW_SERVER_URL'] ?? dotenv.env['SERVER_URL'] ?? '';
    } else {
      return dotenv.env['SERVER_URL'] ?? '';
    }
  }

  DioManager._internal() {
    BaseOptions options = BaseOptions(
      baseUrl: baseUrl,
      contentType: Headers.jsonContentType,
      responseType: ResponseType.json,
      connectTimeout: const Duration(seconds: 30),
      receiveTimeout: const Duration(seconds: 30),
    );

    dio = Dio(options);

    dio.interceptors.add(AuthInterceptor());
  }

  // 请求，返回参数为 T
  // method：请求方法，NWMethod.POST等
  // path：请求地址
  // params：请求参数
  Future request<T>(
    NWMethod method,
    String path, {
    Object? params,
    Map<String, dynamic>? queryParameters,
  }) async {
    Response response = await dio.request(
      path,
      data: params,
      queryParameters: queryParameters,
      options: Options(method: nwMethodValues[method]),
    );
    return response.data;
  }

  /// 下载二进制字节（支持可选忽略证书，仅限移动/桌面端）
  Future<List<int>> downloadBytes(String url, {bool allowInsecure = false}) async {
    // 使用独立 Dio，避免全局适配器被修改
    final client = Dio(BaseOptions(
      responseType: ResponseType.bytes,
      followRedirects: true,
      receiveTimeout: const Duration(seconds: 60),
      connectTimeout: const Duration(seconds: 60),
    ));
    client.interceptors.add(AuthInterceptor());

    // 仅在非Web端尝试忽略证书
    if (allowInsecure && !kIsWeb) {
      client.httpClientAdapter = IOHttpClientAdapter(createHttpClient: () {
        // ignore: unnecessary_new
        final ioClient = new HttpClient();
        ioClient.badCertificateCallback = (cert, host, port) => true;
        return ioClient;
      });
    }

    final resp = await client.get(url);
    final status = resp.statusCode ?? 0;
    if (status >= 200 && status < 300) {
      // Dio v5 将 bytes 直接作为 List<int> 返回
      final data = resp.data;
      if (data is List<int>) return data;
      // 某些平台可能返回 Uint8List
      if (data is List) {
        return List<int>.from(data);
      }
      throw Exception('下载返回格式异常');
    }
    throw Exception('下载失败($status)');
  }

  /// 按 .env 配置决定是否允许忽略证书
  Future<List<int>> downloadBytesWithEnv(String url) async {
    final allow = (dotenv.env['ALLOW_INSECURE_SSL'] ?? 'false').toLowerCase() == 'true';
    return downloadBytes(url, allowInsecure: allow);
  }

  /// 使用 Dio 的 download API 下载到临时文件并读出字节
  Future<List<int>> downloadBytesUsingDownload(String url, {bool allowInsecure = false}) async {
    final client = Dio(BaseOptions(
      followRedirects: true,
      receiveTimeout: const Duration(seconds: 120),
      connectTimeout: const Duration(seconds: 60),
    ));
    client.interceptors.add(AuthInterceptor());

    if (allowInsecure && !kIsWeb) {
      client.httpClientAdapter = IOHttpClientAdapter(createHttpClient: () {
        final ioClient = HttpClient();
        ioClient.badCertificateCallback = (cert, host, port) => true;
        return ioClient;
      });
    }

    final tmpDir = await Directory.systemTemp.createTemp('voice_pkg_');
    final baseName = _fileNameFromUrl(url);
    final savePath = p.join(tmpDir.path, baseName);

    await client.download(
      url,
      savePath,
      options: Options(responseType: ResponseType.bytes),
    );

    final file = File(savePath);
    final bytes = await file.readAsBytes();
    // 清理临时文件
    try {
      await file.delete();
      await tmpDir.delete(recursive: true);
    } catch (_) {}
    return bytes;
  }

  /// 读取 .env 决定是否忽略证书，使用 download API
  Future<List<int>> downloadBytesUsingDownloadWithEnv(String url) async {
    final allow = (dotenv.env['ALLOW_INSECURE_SSL'] ?? 'false').toLowerCase() == 'true';
    return downloadBytesUsingDownload(url, allowInsecure: allow);
  }

  String _fileNameFromUrl(String url) {
    try {
      final clean = url.split('?').first;
      final last = clean.split('/').last;
      if (last.isEmpty) return 'voice.pkg';
      return last;
    } catch (_) {
      return 'voice.pkg';
    }
  }
}