'use strict';

const config = require('config');
const fetch = require('node-fetch');
const mime = require('mime-types');

async function imgurAlbum(post) {
    const res = await fetch(`https://imgur.com/a/${post.host.id}`);
    const html = await res.text();

    if (res.status !== 200) {
        throw new Error(`Could not fetch info for imgur image '${post.host.id}': '${res.statusText}'`);
    }

    const dataString = html.replace(/\s+/g, ' ').match(/}}, item:(.*)}; var PREBID_TIMEOUT/)[1];
    const data = JSON.parse(dataString);

    const extract = config.library.album.extractSingleItem && data.album_images.images.length === 1;

    return {
        album: extract ? null : {
            id: data.id,
            url: `https://imgur.com/a/${post.host.id}`,
            title: data.title,
            description: data.description,
            datetime: new Date(data.datetime),
        },
        items: data.album_images.images.map(item => ({
            extracted: extract,
            id: item.hash,
            url: data.animated ? `https://i.imgur.com/${item.hash}.mp4` : `https://i.imgur.com/${item.hash}${item.ext}`,
            title: item.title || (extract ? data.title : null),
            description: item.description || (extract ? data.description : null),
            type: item.animated ? 'video/mp4' : mime.lookup(item.ext.split('?')[0]),
            datetime: new Date(item.datetime),
        })),
    };
}

module.exports = imgurAlbum;