import superagent from 'superagent';
import superagentSerializer from 'superagent-serializer';

import es6Promise from 'es6-promise';
import superagentPromise from 'superagent-promise';
import prefix from 'superagent-prefix';

superagentSerializer(superagent, 'camel');

const promise = Promise || es6Promise.Promise;
const agent = superagentPromise(superagent, promise);

const useHost = host => (request) => {
  if (host) {
    request.use(prefix(host));
  }

  return request;
};

/* eslint-disable no-param-reassign */
const setCsrfToken = token => (request) => {
  if (!token) {
    token = document.querySelector('meta[name="csrf-token"]').getAttribute('content');
  }

  request.set('X-CSRF-Token', token);
  return request;
};

class Request {
  constructor(options = { host: '/' }) {
    this.options = options;
  }

  fetch(url, query) {
    return this.method('get', url).type('json').query(query);
  }

  create(url, data) {
    return this.method('post', url).send({ data });
  }

  update(url, data) {
    return this.method('put', url).send({ data });
  }

  delete(url) {
    return this.method('delete', url);
  }

  method(method, url) {
    return agent[method](url)
      .withCredentials()
      .accept('json')
      .use(useHost(this.options.host))
      .use(setCsrfToken());
  }
}
/* eslint no-undef: "off" */
const currentOptions = {
  host: `//api.${document.location.host}`,
};

export default new Request(currentOptions);