const fetch = require('node-fetch');
const graphql_endpoint = 'https://www.facebook.com/api/graphql/';

const do_request = async (doc_id, variables) => {
  const params = new URLSearchParams();
  params.append('doc_id', doc_id);
  params.append('variables', JSON.stringify(variables));

  const fetch_options = {
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: params,
    method: 'POST',
  };

  let res = null;
  try {
    res = await fetch(graphql_endpoint, fetch_options);
  } catch (e) {
    console.error(e);
    return null;
  }

  if (!res.ok) {
    return null;
  }

  try {
    res = await res.json();
  } catch (e) {
    console.error(e);
    return null;
  }

  return res;
};

module.exports = {
  do_request,
};