'use strict';

const config = require('config');
const Promise = require('bluebird');
const path = require('path');
const fs = require('fs-extra');
const bhttp = require('bhttp');
const mime = require('mime');
const sharp = require('sharp');
const blake2 = require('blake2');

const knex = require('./knex');

function getHash(buffer) {
    const hash = blake2.createHash('blake2b', { digestLength: 24 });

    hash.update(buffer);

    return hash.digest('hex');
}

async function getThumbnail(buffer) {
    return sharp(buffer)
        .resize({
            height: config.media.thumbnailSize,
            withoutEnlargement: true,
        })
        .toBuffer();
}

async function createReleaseMediaDirectory(release, releaseId) {
    if (release.poster || (release.photos && release.photos.length) || release.trailer) {
        await fs.mkdir(
            path.join(config.media.path, 'releases', release.site.network.slug, release.site.slug, releaseId.toString()),
            { recursive: true },
        );
    }
}

async function createActorMediaDirectory(profile, actor) {
    if (profile.avatars && profile.avatars.length) {
        await fs.mkdir(
            path.join(config.media.path, 'actors', actor.slug),
            { recursive: true },
        );
    }
}

async function storePoster(release, releaseId) {
    if (!release.poster) {
        console.warn(`No poster available for (${release.site.name}, ${releaseId}}) "${release.title}"`);
        return;
    }

    console.log(`Storing poster for (${release.site.name}, ${releaseId}) "${release.title}"`);

    const res = await bhttp.get(release.poster);

    if (res.statusCode === 200) {
        const thumbnail = await getThumbnail(res.body);

        const { pathname } = new URL(release.poster);
        const mimetype = res.headers['content-type'] || mime.getType(pathname) || 'image/jpeg';
        const extension = mime.getExtension(mimetype);

        const filepath = path.join('releases', release.site.network.slug, release.site.slug, releaseId.toString(), `poster.${extension}`);
        const thumbpath = path.join('releases', release.site.network.slug, release.site.slug, releaseId.toString(), `poster_thumb.${extension}`);
        const hash = getHash(res.body);

        await Promise.all([
            fs.writeFile(path.join(config.media.path, filepath), res.body),
            fs.writeFile(path.join(config.media.path, thumbpath), thumbnail),
        ]);

        await knex('media').insert({
            path: filepath,
            thumbnail: thumbpath,
            mime: mimetype,
            hash,
            source: release.poster,
            domain: 'releases',
            target_id: releaseId,
            role: 'poster',
        });

        return;
    }

    console.warn(`Failed to store poster for (${release.site.name}, ${releaseId}) "${release.title}": ${res.statusCode}`);
}

async function storePhotos(release, releaseId) {
    if (!release.photos || release.photos.length === 0) {
        console.warn(`No photos available for (${release.site.name}, ${releaseId}}) "${release.title}"`);
        return;
    }

    console.log(`Storing ${release.photos.length} photos for (${release.site.name}, ${releaseId}) "${release.title}"`);

    const files = await Promise.map(release.photos, async (photoUrl, index) => {
        const { pathname } = new URL(photoUrl);
        const mimetype = mime.getType(pathname);

        try {
            const res = await bhttp.get(photoUrl);

            if (res.statusCode === 200) {
                const thumbnail = await getThumbnail(res.body);
                const extension = mime.getExtension(mimetype);

                const filepath = path.join('releases', release.site.network.slug, release.site.slug, releaseId.toString(), `${index + 1}.${extension}`);
                const thumbpath = path.join('releases', release.site.network.slug, release.site.slug, releaseId.toString(), `${index + 1}_thumb.${extension}`);
                const hash = getHash(res.body);

                await Promise.all([
                    fs.writeFile(path.join(config.media.path, filepath), res.body),
                    fs.writeFile(path.join(config.media.path, thumbpath), thumbnail),
                ]);

                return {
                    filepath,
                    thumbpath,
                    mimetype,
                    hash,
                    source: photoUrl,
                };
            }

            throw new Error(`Response ${res.statusCode} not OK`);
        } catch (error) {
            console.warn(`Failed to store photo ${index + 1} for "${release.title}" (${photoUrl}, ${release.url}, ${release.site.name}, ${releaseId}): ${error}`);

            return null;
        }
    }, {
        concurrency: 10,
    });

    await knex('media')
        .insert(files.filter(file => file)
            .map((file, index) => ({
                path: file.filepath,
                thumbnail: file.thumbpath,
                mime: file.mimetype,
                hash: file.hash,
                source: file.source,
                index,
                domain: 'releases',
                target_id: releaseId,
                role: 'photo',
            })));
}

async function storeTrailer(release, releaseId) {
    if (!release.trailer || !release.trailer.src) {
        console.warn(`No trailer available for (${release.site.name}, ${releaseId}}) "${release.title}"`);
        return;
    }

    console.log(`Storing trailer for (${release.site.name}, ${releaseId}) "${release.title}"`);

    const { pathname } = new URL(release.trailer.src);
    const mimetype = release.trailer.type || mime.getType(pathname);

    const res = await bhttp.get(release.trailer.src);
    const filepath = path.join('releases', release.site.network.slug, release.site.slug, releaseId.toString(), `trailer${release.trailer.quality ? `_${release.trailer.quality}` : ''}.${mime.getExtension(mimetype)}`);

    await Promise.all([
        fs.writeFile(path.join(config.media.path, filepath), res.body),
        knex('media').insert({
            path: filepath,
            mime: mimetype,
            source: release.trailer.src,
            domain: 'releases',
            target_id: releaseId,
            role: 'trailer',
            quality: release.trailer.quality || null,
        }),
    ]);
}

async function storeAvatars(profile, actor) {
    if (!profile.avatars || profile.avatars.length === 0) {
        console.warn(`No avatars available for '${profile.name}'`);
        return;
    }

    console.log(`Storing ${profile.avatars.length} avatars for '${profile.name}'`);

    const files = await Promise.map(profile.avatars, async (avatarUrl, index) => {
        try {
            const { pathname } = new URL(avatarUrl);
            const mimetype = mime.getType(pathname);

            const res = await bhttp.get(avatarUrl);

            if (res.statusCode === 200) {
                const thumbnail = await getThumbnail(res.body);
                const extension = mime.getExtension(mimetype);

                const timestamp = new Date().getTime();

                const filepath = path.join('actors', actor.slug, `${timestamp + index}.${extension}`);
                const thumbpath = path.join('actors', actor.slug, `${timestamp + index}_thumb.${extension}`);
                const hash = getHash(res.body);

                await Promise.all([
                    fs.writeFile(path.join(config.media.path, filepath), res.body),
                    fs.writeFile(path.join(config.media.path, thumbpath), thumbnail),
                ]);

                return {
                    filepath,
                    thumbpath,
                    mimetype,
                    hash,
                    source: avatarUrl,
                };
            }

            throw new Error(`Response ${res.statusCode} not OK`);
        } catch (error) {
            console.warn(`Failed to store avatar ${index + 1} for '${profile.name}': ${avatarUrl}`);

            return null;
        }
    }, {
        concurrency: 10,
    });

    const avatars = files.filter(file => file);

    const existingAvatars = await knex('media')
        .whereIn('hash', avatars.map(file => file.hash));

    const newAvatars = avatars.filter(file => !existingAvatars.some(avatar => file.hash === avatar.hash));
    const hasAvatar = existingAvatars.some(avatar => avatar.role === 'avatar');

    await knex('media')
        .insert(newAvatars.map((file, index) => ({
            path: file.filepath,
            thumbnail: file.thumbpath,
            mime: file.mimetype,
            hash: file.hash,
            source: file.source,
            index,
            domain: 'actors',
            target_id: actor.id,
            role: index === 0 && !hasAvatar ? 'avatar' : 'photo',
        })));
}

module.exports = {
    createActorMediaDirectory,
    createReleaseMediaDirectory,
    storeAvatars,
    storePoster,
    storePhotos,
    storeTrailer,
};