base_network.dart

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:helpservice/utils/constants.dart';
import 'package:shared_preferences/shared_preferences.dart';

class DioClient {
  factory DioClient() {
    return _singleton;
  }

  DioClient._internal() {
    if (_dio == null) {
      init();
    }
  }

  static final DioClient _singleton = DioClient._internal();

  Dio _dio;
  Dio _tokenDio;

  String token;

  static SharedPreferences sharedPrefs;

  Future<String> _getAuthorizationToken() async {
    if (sharedPrefs == null) {
      await _setUpSharedPrefs();
    }
    token = sharedPrefs.getString('token');
    print(token);
    return token ?? '';
  }

  Future<void> _setUpSharedPrefs() async {
    sharedPrefs = await SharedPreferences.getInstance();
  }

  dynamic init() {
    _setUpSharedPrefs();
    _dio = Dio();
    _dio.options = BaseOptions(
      validateStatus: (status) => status <= 500,
      baseUrl: Constants.baseUrl,
    );
    // Used to get token
    _tokenDio = Dio();
    _tokenDio.options = BaseOptions(
      validateStatus: (status) => status < 500,
      baseUrl: Constants.baseUrl,
    );
    _tokenDio.interceptors.add(
      InterceptorsWrapper(
        onRequest: (options, handler) async {
          return handler.next(options);
        },
      ),
    );

    _dio.interceptors
        .add(InterceptorsWrapper(onRequest: (options, handler) async {
      options.headers['Accept'] = 'application/json';

      final token = await _getAuthorizationToken();

      options.queryParameters['wstoken'] = "$token";
      options.queryParameters['moodlewsrestformat'] = 'json';
      // options.queryParameters['service'] = 'moodle_mobile_app';

      return handler.next(options);
    }, onResponse: (response, handler) async {
      // Do something with response data
      // TODO: Remove Print Statements
      debugPrint(response.requestOptions.uri.toString());
      debugPrint(response.statusCode.toString());
      print(response.data);

      handler.next(response);
    }, onError: (error, handler) async {
      // TODO: Remove Print Statements
      debugPrint('Error');
      debugPrint(error?.response?.requestOptions?.uri.toString());
      debugPrint(error?.response?.statusCode?.toString() ?? '');

      handler.next(error);
    }));
  }

  Dio get ref => _dio;

  Dio get tokenRef => _tokenDio;
}

final dioClient = DioClient();