class APIClient {

  constructor(baseURL) {

    this.baseURL = baseURL;

  }

  createRequest = (method, uri, data, headers) => {

    headers = headers || new Headers();

    headers.append("Content-Type", "application/json");

    var options = {

      method: method,

      headers: headers,

    };

    if (data) {

      options.body = JSON.stringify(data);

    }

    // TODO : use URL-module to build URL

    return new Request(this.baseURL + uri, options);

  }

  hasToken = () => {

    const token = localStorage.getItem('token');

    return token !== null;

  }

  createAuthorizedRequest = (method, uri, data) => {

    var headers = new Headers(),

        token = localStorage.getItem('token') || '';

    return this.createRequest(method, uri, data, headers);

  }

  request = (method, uri, data) => {

    console.log(method + ' ' + uri);

    var req = this.hasToken() ? this.createAuthorizedRequest(method, uri, data) : this.createRequest(method, uri, data);

    return this.fetch(req, { credentials: 'include' });

  }

  get = (uri, data) => {

    return this.request('GET', uri, data);

  }

  post = (uri, data) => {

    return this.request('POST', uri, data);

  }

  put = (uri, data) => {

    return this.request('PUT', uri, data);

  }

  fetch = (req) => {

    return new Promise((resolve, reject) => {

      fetch(req)

        .then((response) => {

          if (response.ok) {

            return response.json().then((data) => resolve(data));

          } else {

            return response.json().then((data) => reject(data));

          }

        });

    });

  }

}

export default APIClient