function createReviewController({ fetchJson }) {
  function endpoint(item) {
    const [owner, repo] = String(item.repository || '').split('/');
    if (!owner || !repo || !Number.isInteger(Number(item.number))) {
      throw new Error('This review link is invalid.');
    }
    return 'api/v1/repos/' + encodeURIComponent(owner) + '/' + encodeURIComponent(repo) +
      '/pulls/' + Number(item.number) + '/review';
  }

  async function load(item) {
    return fetchJson(endpoint(item), { headers: { Accept: 'application/json' } });
  }

  return { load };
}

if (typeof module !== 'undefined' && module.exports) {
  module.exports = createReviewController;
}