const { art } = require('@/utils/render');
const { parseDate } = require('@/utils/parse-date');
const cheerio = require('cheerio');
const got = require('@/utils/got');
const md5 = require('@/utils/md5');
const path = require('path');

module.exports = async (ctx) => {
    const category = ctx.params.category || 'all';
    const limit = parseInt(ctx.query.limit) || 12;

    const link = getLink(category);
    const $ = cheerio.load(await get(link));
    const title = $('head>title').text();
    const description = $('head>meta[name="description"]').attr('content');
    const image = $('head>link[rel="apple-touch-icon"]').attr('href');

    const api = getApi(category);
    api.searchParams.set('include', 'media');
    api.searchParams.set('page[limit]', limit);
    api.searchParams.set('sort', '-published-at');
    api.searchParams.set('filter[list-all]', '0');
    api.searchParams.set('fields[radios]', 'title,cover,published-at,duration,content,media');
    const { data, included } = await get(api);

    const audios = included.reduce((result, media) => {
        result[media.id] = media.attributes.audio;
        return result;
    }, {});

    const item = data.map((radio) => {
        const { id, attributes, relationships } = radio;

        const link = `https://www.gcores.com/radios/${id}`;
        const itunes_item_image = `https://image.gcores.com/${attributes.cover}`;
        const media_id = relationships.media.data.id;
        const enclosure_url = new URL(audios[media_id], 'https://alioss.gcores.com/uploads/audio/').toString();
        const description = art(path.join(__dirname, 'templates/content.art'), {
            content: JSON.parse(attributes.content),
        });

        return {
            title: attributes.title,
            author: '机核 GCORES',
            description,
            pubDate: parseDate(attributes['published-at']),
            guid: md5(link),
            link,
            itunes_item_image,
            itunes_duration: attributes.duration,
            enclosure_url,
            enclosure_type: 'audio/mpeg',
        };
    });

    ctx.state.data = {
        title,
        link,
        description,
        language: 'zh-cn',
        itunes_author: '机核 GCORES',
        image: `https://www.gcores.com/${image}`,
        item,
    };
};

const get = async (url) => {
    const response = await got({
        method: 'get',
        url: new URL(url, 'https://www.gcores.com'),
    });

    return response.data;
};

const getLink = (category) => {
    if (category === 'all') {
        return 'https://www.gcores.com/radios';
    } else {
        return `https://www.gcores.com/categories/${category}`;
    }
};

const getApi = (category) => {
    if (category === 'all') {
        return new URL('https://www.gcores.com/gapi/v1/radios');
    } else {
        return new URL(`https://www.gcores.com/gapi/v1/categories/${category}/radios`);
    }
};