import Cookies from 'js-cookie';

export class HttpClient {

  static ACCEPT = {
    TEXT_HTML: 'text/html',
    JSON: 'application/json',
  };

  _responseInterceptors = [];

  addResponseInterceptor(interceptor) {
    if (typeof interceptor === 'function') {
      this._responseInterceptors.push(interceptor);
    }
  }

  _baseUrl;

  setBaseUrl(baseUrl) {
    if (typeof this._baseUrl !== 'undefined') {
      throw new Error('HttpClient baseUrl is already set');
    }

    this._baseUrl = baseUrl;
  }

  _defaultUrl;

  setDefaultUrl(defaultUrl) {
    if (typeof this._defaultUrl !== 'undefined') {
      throw new Error('HttpClient defaultUrl is already set');
    }

    this._defaultUrl = defaultUrl;
  }


  get(args) {
    args.method = 'GET';
    return this._fetch(args);
  }

  post(args) {
    args.method = 'POST';
    args.headers = args.headers || {};
    args.headers['X-XSRF-TOKEN'] = Cookies.get('XSRF-TOKEN');
    return this._fetch(args);
  }

  _fetch(options) {
    options.url = (options.url && options.url.href) || options.url || this._defaultUrl;
    
    if (this._baseUrl && options.url && options.url.substring(0,1) === '/' && options.url.substring(0,2) !== '//')
      options.url = this._baseUrl + (this._baseUrl.substring(this._baseUrl.substring.length - 1) === '/' ? '' : '/') + options.url.substring(1,0);
    
    const requestOptions = {
      credentials: 'same-origin',
      ...options,
    };

    return fetch(options.url || window.location.href, requestOptions)
      .then(
        (response) => {
          this._responseInterceptors.forEach((interceptor) => interceptor(response, options));
          return Promise.resolve(response);
        },
        Promise.reject,
      ).catch(console.error);
  }
}