import axios from 'axios';
import * as cheerio from 'cheerio';

type Repository = {
  author: string,
  name: string,
  href: string,
  description: string | null,
  language: string,
  stars: number,
  forks: number,
  starsInPeriod: number | null,
};

const trendingGitHub = (period: string = 'daily', language: string = '') => (
  new Promise<Repository[]>((resolve, reject) => axios
    .get(`https://github.com/trending/${encodeURIComponent(language)}?since=${period}`, {
      headers: {
        Accept: 'text/html',
      },
    })
    .then((response) => {
      const $ = cheerio.load(response.data);
      const repos: Repository[] = [];

      $('article').each((index, repo) => {
        const title = $(repo).find('h1.h3 a').text().replace(/\s/g, '');

        const author = title.split('/')[0];
        const name = title.split('/')[1];

        const starLink = `/${title.replace(/ /g, '')}/stargazers`;
        const forkLink = `/${title.replace(/ /g, '')}/network/members.${name}`;

        let text = '';
        if (period === 'daily') {
          text = 'stars today';
        } else if (period === 'weekly') {
          text = 'stars this week';
        } else {
          text = 'stars this month';
        }

        const indexRepo: Repository = {
          author,
          name,
          href: `https://github.com/${author}/${name}`,
          description: $(repo).find('p').text().trim() || null,
          language: $(repo).find('[itemprop=programmingLanguage]').text().trim(),
          stars: parseInt($(repo).find(`[href="${starLink}"]`).text().trim()
            .replace(',', '') || '0', 0),
          forks: parseInt($(repo).find(`[href="${forkLink}"]`).text().trim()
            .replace(',', '') || '0', 0),
          starsInPeriod: parseInt(
            $(repo)
              .find(`span.float-sm-right:contains('${text}')`)
              .text()
              .trim()
              .replace(text, '')
              .replace(',', '') || '0',
            0,
          ),
        };

        repos.push(indexRepo);
      });

      resolve(repos);
    })
    .catch((err) => {
      reject(err);
    })));

export default trendingGitHub;

// For CommonJS default export support
module.exports = trendingGitHub;
module.exports.default = trendingGitHub;