import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart' hide Response;
import 'dart:convert';
import 'package:crypto/crypto.dart';

import 'package:get_storage/get_storage.dart';
import 'entity/base_entity.dart';

class AuthInterceptor extends Interceptor {
  final GetStorage _storage = GetStorage();
  final String _signKey = '@214%67g15q4*67m17#4l67!'; // 替换为实际的密钥

  bool _shouldSuppressErrorSnackbar(DioException err) {
    final path = err.requestOptions.path;
    return path == '/api/home/user_getinfo';
  }

  bool _shouldSuppressBusinessErrorSnackbar(RequestOptions options) {
    final path = options.path;
    return path == '/api/home/user_getinfo';
  }

  String _mapBadResponseMessage(DioException err) {
    final statusCode = err.response?.statusCode;
    final statusMessage = (err.response?.statusMessage ?? '').toLowerCase();

    if (statusCode == 401 || statusCode == 403) {
      return 'loginExpiredPleaseRelogin'.tr;
    }

    if (statusCode == 404 || statusMessage.contains('record not found')) {
      return 'requestedResourceNotFound'.tr;
    }

    if (statusCode != null && statusCode >= 500) {
      return 'serverTemporarilyUnavailable'.tr;
    }

    return 'unknownError'.tr;
  }

  @override
  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
    var jsonString = _storage.read<String>("logintoken");
    options.headers['Authorization'] = jsonString;
    final timestamp = DateTime.now().millisecondsSinceEpoch.toString();
    options.headers['Ts'] = timestamp;
    options.headers['Sign'] = _generateSign(timestamp);
    handler.next(options);
  }

  String _generateSign(String timestamp) {
    // 按照“MD5(私钥 + 时间戳)”生成签名，与 Go 端保持一致
    final signStr = 'ts=${timestamp}key=${_signKey}';
    print("signStr: $signStr");
    return md5.convert(utf8.encode(signStr)).toString();
  }

  @override
  void onResponse(Response response, ResponseInterceptorHandler handler) async {
    BaseEntity entity = BaseEntity.fromJson(response.data);
    if (entity.code == 0) {
      response.data = entity.data ?? {};
      handler.resolve(response);
    } else {
      response.data = null;
      handler.next(response);

      if (_shouldSuppressBusinessErrorSnackbar(response.requestOptions)) {
        return;
      }

      final rawMessage = entity.message ?? '';
      final lowerMessage = rawMessage.toLowerCase();
      final displayMessage = lowerMessage.contains('record not found')
          ? 'requestedResourceNotFound'.tr
          : (entity.message ?? 'unknownError'.tr);

      Get.snackbar(
        'error'.tr, // 错误
        displayMessage,
        snackPosition: SnackPosition.TOP,
        backgroundColor: Colors.red.withOpacity(0.1),
        colorText: Colors.red,
      );
      return;
    }
  }

  @override
  void onError(DioException err, ErrorInterceptorHandler handler) {
    switch (err.type) {
      case DioExceptionType.cancel:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'requestCancellation'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.connectionTimeout:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'connectionTimeout'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.sendTimeout:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'requestTimeout'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.receiveTimeout:
        {
          Get.snackbar(
            'error'.tr, // 错误
            'responseTimeout'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      case DioExceptionType.badResponse:
        {
          if (_shouldSuppressErrorSnackbar(err)) {
            handler.next(err);
            return;
          }

          Get.snackbar(
            'error'.tr, // 错误
            _mapBadResponseMessage(err),
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
      default:
        {
          Get.snackbar(
            'error'.tr, // 错误
            err.message ?? 'unknownError'.tr,
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.red.withOpacity(0.1),
            colorText: Colors.red,
          );
        }
    }
    handler.next(err);
  }
}