'use strict';

const fetch = require('node-fetch');
const mime = require('mime');
// const unprint = require('unprint');

const { version } = require('../../package.json');

async function fetchPredata() {
    const userAgent = `ripunzel/${version}`;
    const res = await fetch('https://api.redgifs.com/v2/auth/temporary', {
        headers: {
            'user-agent': userAgent,
        },
    });

    const data = await res.json();

    if (res.ok) {
        return {
            address: data.addr,
            agent: data.agent,
            token: data.token,
        };
    }

    return null;
}

function scrapeGallery(data, { predata }) {
    const oldestDate = Math.min(...data.gifs.map((gif) => gif.createDate));

    const curated = {
        album: {
            id: data.id,
            datetime: new Date(oldestDate * 1000),
        },
        items: data.gifs.map((gif) => ({
            id: gif.id,
            url: gif.urls.hd,
            description: gif.tags.join(', '),
            type: mime.getType(new URL(gif.urls.hd).pathname.slice(1)),
            datetime: new Date(gif.createDate * 1000),
            original: gif,
        })),
        headers: {
            'user-agent': predata.agent,
        },
    };

    return curated;
}

async function fetchGallery(galleryId, { predata }) {
    const res = await fetch(`https://api.redgifs.com/v2/gallery/${galleryId}`, {
        headers: {
            authorization: `Bearer ${predata.token}`,
            'user-agent': predata.agent,
        },
    });

    const data = await res.json();

    if (!data.gifs) {
        return null;
    }

    return scrapeGallery(data, { predata });
}

async function redgifsApi(host, post, { predata }) {
    if (!predata?.token) {
        throw new Error('No RedGifs token provided');
    }

    const res = await fetch(`https://api.redgifs.com/v2/gifs/${host.id.toLowerCase()}`, {
        headers: {
            authorization: `Bearer ${predata.token}`,
            'user-agent': predata.agent,
        },
    });

    const data = await res.json();

    if (data.errorMessage || data.error) {
        throw new Error(`RedGifs API returned error for source '${host.url}' (${res.status}): ${data.errorMessage?.description || data.error?.description}`);
    }

    if (data.id && data.gifs) {
        return scrapeGallery(data, { predata });
    }

    if (!data.gif) {
        return null;
    }

    if (data.gif.gallery) {
        return fetchGallery(data.gif.gallery, { predata });
    }

    const curated = {
        album: null,
        items: [{
            id: data.gif.id,
            url: data.gif.urls.hd,
            description: data.gif.tags.join(', '),
            type: mime.getType(new URL(data.gif.urls.hd).pathname),
            datetime: new Date(data.gif.createDate * 1000),
            original: data.gif,
        }],
        headers: {
            'user-agent': predata.agent,
        },
    };

    return curated;
}

async function redgifs(host, post, { predata }) {
    if (predata?.token) {
        return redgifsApi(host, post, { predata });
    }

    throw new Error('No RedGifs token provided');

    /*
    const res = await unprint.get(host.url);

    if (!res.ok) {
        throw new Error(`RedGifs returned error for source '${host.url}' (${res.status})`);
    }

    const data = res.context.query.json('script[type="application/ld+json"]');

    if (!data.video) {
        return null;
    }

    // console.log(data);

    const curatedData = {
        album: null,
        items: [{
            id: host.id,
            url: data.video.contentUrl,
            description: data.video.keywords,
            type: mime.getType(new URL(data.video.contentUrl).pathname),
            datetime: new Date(data.video.uploadDate),
            original: data.video,
        }],
    };

    // console.log(curatedData);
    return null;

    // return curatedData;
    */
}

module.exports = {
    fetchInfo: redgifs,
    fetchPredata,
};