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

const ProcessFeed = (i, $, link) => {
    const title = $('h1').text();
    let content = $('div.story-container').eq(i);

    // 处理封面图片
    content.find('div.story-image > figure').each((_, e) => {
        const src = `https://thumbor.ftacademy.cn/unsafe/1340x754/${e.attribs['data-url']}`;

        $(`<img src=${src}>`).insertAfter(content.find('div.story-lead')[0]);
    });

    // 付费文章跳转
    content.find('div#subscribe-now-container').each((_, e) => {
        $(`<br/><p>此文章为付费文章，会员<a href='${link}'>请访问网站阅读</a>。</p>`).insertAfter(content.find('div.story-body')[0]);
        $(e).remove();
    });

    // 获取作者
    let author = '';
    content.find('span.story-author > a').each((_, e) => {
        author += `${$(e).text()} `;
    });
    author = author.trim();

    // 去除头部主题, 头部重复标题, 冗余元数据, 植入广告, 植入 js, 社交分享按钮, 底部版权声明, 空白 DOM
    content
        .find(
            'div.story-theme, h1.story-headline, div.story-byline, div.mpu-container-instory,script, div#story-action-placeholder, div.copyrightstatement-container, div.clearfloat, div.o-ads, h2.list-title, div.allcomments, div.logincomment, div.nologincomment'
        )
        .each((_, e) => {
            $(e).remove();
        });
    content = content.html();

    return { content, author, title };
};

const getData = async ({ site = 'www', channel, ctx }) => {
    let feed;

    if (channel) {
        channel = channel.toLowerCase();
        channel = channel.split('-').join('/');

        try {
            feed = await parser.parseURL(`https://${site}.ftchinese.com/rss/${channel}`);
        } catch (error) {
            return {
                title: `FT 中文网 ${channel} 不存在`,
                description: `FT 中文网 ${channel} 不存在`,
            };
        }
    } else {
        feed = await parser.parseURL(`https://${site}.ftchinese.com/rss/feed`);
    }

    const items = await Promise.all(
        feed.items.map((item) => {
            item.link = item.link.replace('http://', 'https://');
            return ctx.cache.tryGet(item.link, async () => {
                const response = await got.get(`${item.link}?full=y&archive`);

                const $ = cheerio.load(response.data);
                const results = [];
                for (let i = 0; i < $('div.story-container').length; i++) {
                    results.push(ProcessFeed(i, $, item.link));
                }

                item.title = results[0].title;
                item.description = results.map((result) => result.content).join('');
                item.author = results[0].author;
                return item;
            });
        })
    );

    return {
        title: feed.title,
        link: feed.link,
        description: feed.description,
        item: items,
    };
};

module.exports = {
    getData,
};