const got = require('@/utils/got');
const cheerio = require('cheerio');

module.exports = async (ctx) => {
    const url = 'http://mysql.taobao.org/monthly/';
    const response = await got({ method: 'get', url });
    const $ = cheerio.load(response.data);

    const list = $("ul[class='posts'] > li")
        .map((i, e) => {
            const element = $(e);
            const title = element
                .find('a')
                .text()
                .trim();
            const link =
                'http://mysql.taobao.org' +
                element
                    .find('a')
                    .attr('href')
                    .trim();
            return {
                title: title,
                description: '',
                link: link,
            };
        })
        .get();

    const result = await Promise.all(
        list.map(async (item) => {
            const link = item.link;

            const cache = await ctx.cache.get(link);
            if (cache) {
                return Promise.resolve(JSON.parse(cache));
            }

            const itemReponse = await got.get(link);
            const itemElement = cheerio.load(itemReponse.data);
            item.description = itemElement('.content').html();

            ctx.cache.set(link, JSON.stringify(item));
            return Promise.resolve(item);
        })
    );

    ctx.state.data = {
        title: $('title').text(),
        link: url,
        item: result.reverse(),
    };
};