const cheerio = require('cheerio');
const got = require('@/utils/got');
const { parseDate } = require('@/utils/parse-date');

module.exports = async (ctx) => {
    const channel = ctx.params.channel;
    const link = `https://www.fx-markets.com/${channel}`;
    const html = (await got(link)).data;
    const $ = cheerio.load(html);
    const pageTitle = $('header.select-header > h1').text();
    const title = `FX-Markets ${pageTitle}`;

    const items = $('div#listings').children();
    const articles = items
        .map((i, el) => {
            const $el = $(el);
            const $titleEl = $el.find('h5 > a');
            const articleURL = `https://www.fx-markets.com${$titleEl.attr('href')}`;
            const articleTitle = $titleEl.attr('title');
            return {
                title: articleTitle,
                link: articleURL,
                pubDate: parseDate($el.find('time').text()),
            };
        })
        .get();

    const result = await Promise.all(
        articles.map((item) =>
            ctx.cache.tryGet(item.link, async () => {
                const res = await got(item.link);
                const doc = cheerio.load(res.data);
                // This script holds publish datetime info {"datePublished": "2022-05-12T08:45:04+01:00"}
                const dateScript = doc('script[type="application/ld+json"]').get()[0].children[0].data;
                const re = /"datePublished": "(?<dateTimePub>.*)"/;
                const dateStr = re.exec(dateScript).groups.dateTimePub;
                const pubDateTime = parseDate(dateStr, 'YYYY-MM-DDTHH:mm:ssZ');
                // Exclude hidden print message
                item.description = doc('div.article-page-body-content:not(.print-access-info)').html();
                return {
                    title: item.title,
                    link: item.link,
                    description: item.description,
                    // if we fail to get accurate publish date time, show date only from article link on index page.
                    pubDate: pubDateTime ? pubDateTime : item.pubDate,
                };
            })
        )
    );

    ctx.state.data = {
        title,
        link,
        item: result,
    };
};