'use strict';

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

async function imgurAlbumApi(post) {
    return fetch(`https://api.imgur.com/3/album/${post.host.id}`, {
        headers: {
            Authorization: `Client-ID ${config.methods.imgur.clientId}`,
        },
    }).then(res => res.json()).then((res) => {
        if (res.status !== 200) {
            throw new Error(`Could not fetch info for imgur album '${post.host.id}': ${res.data.error}`);
        }

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

        if (extract) {
            console.log('\x1b[36m%s\x1b[0m', `Extracting single item from album '${post.title}' - ${res.data.link}`);
        }

        return {
            album: extract ? null : {
                id: res.data.id,
                url: res.data.link,
                title: res.data.title,
                description: res.data.description,
                datetime: new Date(res.data.datetime * 1000),
                original: res.data,
            },
            items: res.data.images.map(item => ({
                extracted: extract,
                id: item.id,
                url: item.animated ? item.mp4 : item.link,
                title: item.title || (extract ? res.data.title : null),
                description: item.description || (extract ? res.data.description : null),
                type: item.animated ? 'video/mp4' : item.type,
                datetime: item.datetime * 1000,
                original: item,
            })),
        };
    });
}

async function imgurAlbum(post) {
    return imgurAlbumApi(post);

    /*
     * as of late 2019, imgur requires log in to view albums and gallery images
    const res = await fetch(`https://imgur.com/a/${post.host.id}`);
    const html = await res.text();

    if (res.status !== 200) {
        if (config.methods.imgur.clientId) {
            console.log('\x1b[31m%s\x1b[0m', `Could not fetch info for direct imgur album '${post.host.id}' (${res.statusText}), trying API fallback (${post.permalink})`);

            return imgurAlbumApi(post);
        }

        throw new Error(`Could not fetch info for imgur album '${post.host.id}' (${res.statusText}) no API fallback configured`);
    }

    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;