liangchengyou / wow_english

  import 'dart:convert';
  
  import 'package:dio/dio.dart';

  import 'package:flutter/foundation.dart';

  import 'package:pretty_dio_logger/pretty_dio_logger.dart';
  

  import '../core/user_util.dart';

  import 'api_response/api_response_entity.dart';
  import 'api_response/raw_data.dart';
  import 'config.dart';
  import 'exception.dart';
  import 'token_interceptor.dart';
  
  RequestClient requestClient = RequestClient();
  
  class RequestClient {
    late Dio _dio;
  
    RequestClient() {
      _dio = Dio(BaseOptions(baseUrl: RequestConfig.baseUrl, connectTimeout: RequestConfig.connectTimeout));
      _dio.interceptors.add(TokenInterceptor());

      if (kDebugMode) {
        _dio.interceptors
            .add(PrettyDioLogger(requestHeader: true, requestBody: true, responseHeader: true, maxWidth: 120));
      }

    }
  
    Future<T?> request<T>(
      String url, {
      required String method,
      Map<String, dynamic>? queryParameters,
      data,
      Map<String, dynamic>? headers,
      Function(ApiResponse<T>)? onResponse,
      bool Function(ApiException)? onError,
    }) async {
      try {
        Options options = Options()
          ..method = method
          ..headers = headers;
  
        data = _convertRequestData(data);
  
        Response response = await _dio.request(url, queryParameters: queryParameters, data: data, options: options);

        print("response.body type=${response.data.runtimeType}");

        return _handleResponse<T>(response, onResponse);
      } catch (e) {

        print("e type=${e.runtimeType}");
        if (e is ApiException && e.code == 405) {

          UserUtil.logout();
          return null;
        }

        var exception = ApiException.from(e);
        if (onError?.call(exception) != true) {
          throw exception;
        }
      }

      return null;
    }
  
    _convertRequestData(data) {
      if (data != null) {
        data = jsonDecode(jsonEncode(data));
      }
      return data;
    }
  
    /// get
    Future<T?> get<T>(
      String url, {
      Map<String, dynamic>? queryParameters,
      Map<String, dynamic>? headers,
      bool showLoading = true,
      Function(ApiResponse<T>)? onResponse,
      bool Function(ApiException)? onError,
    }) {
      return request(url,
          method: 'GET', queryParameters: queryParameters, headers: headers, onResponse: onResponse, onError: onError);
    }
  
    /// post
    Future<T?> post<T>(
      String url, {
      Map<String, dynamic>? queryParameters,
      data,
      Map<String, dynamic>? headers,
      bool showLoading = true,
      Function(ApiResponse<T>)? onResponse,
      bool Function(ApiException)? onError,
    }) {
      return request(url,
          method: "POST",
          queryParameters: queryParameters,
          data: data,
          headers: headers,
          onResponse: onResponse,
          onError: onError);
    }
  
    /// delete
    Future<T?> delete<T>(
      String url, {
      Map<String, dynamic>? queryParameters,
      data,
      Map<String, dynamic>? headers,
      bool showLoading = true,
      Function(ApiResponse<T>)? onResponse,
      bool Function(ApiException)? onError,
    }) {
      return request(url,
          method: "DELETE",
          queryParameters: queryParameters,
          data: data,
          headers: headers,
          onResponse: onResponse,
          onError: onError);
    }
  
    /// put
    Future<T?> put<T>(
      String url, {
      Map<String, dynamic>? queryParameters,
      data,
      Map<String, dynamic>? headers,
      bool showLoading = true,
      Function(ApiResponse<T>)? onResponse,
      bool Function(ApiException)? onError,
    }) {
      return request(url,
          method: "PUT",
          queryParameters: queryParameters,
          data: data,
          headers: headers,
          onResponse: onResponse,
          onError: onError);
    }
  
    /// 请求响应内容处理
    T? _handleResponse<T>(
      Response response,
      Function(ApiResponse<T>)? onResponse,
    ) {
      int statusCode = response.statusCode ?? -1;

      // 200..299 成功响应
      if (statusCode >= 200 && statusCode <= 299) {
        if (T.toString() == (RawData).toString()) {
          RawData raw = RawData();
          raw.value = response.data;
          return raw as T;
        } else {

          // 应对response的header中content-type: [text/html;charset=utf-8]的情况
          // 实际上都是json格式返回
          Map<String, dynamic> json;
          if (response.data is String) {
            json = jsonDecode(response.data);
          } else {
            json = response.data;
          }

          ApiResponse<T> apiResponse = ApiResponse.fromJson(json);

          onResponse?.call(apiResponse);
          return _handleBusinessResponse<T>(apiResponse);
        }
      } else {

        ApiException exception = ApiException(response.statusCode, ApiException.unknownException);
        print("_handleResponse exception type=${exception.runtimeType}");

        throw exception;
      }
    }
  
    /// 业务内容处理
    T? _handleBusinessResponse<T>(ApiResponse<T> response) {
      if (response.code == RequestConfig.successCode) {
        return response.data;
      } else {

        ApiException exception = ApiException(response.code, response.msg);
        print("_handleBusinessResponse exception type=${exception.runtimeType}");

        throw exception;
      }
    }
  }