'use strict';

const config = require('config');
const Promise = require('bluebird');
const moment = require('moment');

const logger = require('./logger');
const knex = require('./knex');
const argv = require('./argv');
const whereOr = require('./utils/where-or');
const { associateTags } = require('./tags');
const { associateActors, scrapeBasicActors } = require('./actors');
const {
    createMediaDirectory,
    storePhotos,
    // storeReleasePhotos,
    storeTrailer,
} = require('./media');
const { fetchSites, findSiteByUrl } = require('./sites');
const slugify = require('./utils/slugify');

function commonQuery(queryBuilder, {
    filter = [],
    after = new Date(0), // January 1970
    before = new Date(2 ** 44), // May 2109
    limit = 100,
}) {
    const finalFilter = [].concat(filter); // ensure filter is array

    queryBuilder
        .leftJoin('sites', 'releases.site_id', 'sites.id')
        .leftJoin('studios', 'releases.studio_id', 'studios.id')
        .leftJoin('networks', 'sites.network_id', 'networks.id')
        .select(
            'releases.*',
            'sites.name as site_name', 'sites.slug as site_slug', 'sites.url as site_url', 'sites.network_id', 'sites.parameters as site_parameters',
            'studios.name as studio_name', 'sites.slug as site_slug', 'studios.url as studio_url',
            'networks.name as network_name', 'networks.slug as network_slug', 'networks.url as network_url', 'networks.description as network_description',
        )
        .whereNotExists((builder) => {
            // apply tag filters
            builder
                .select('*')
                .from('tags_associated')
                .leftJoin('tags', 'tags_associated.tag_id', 'tags.id')
                .whereIn('tags.slug', finalFilter)
                .where('tags_associated.domain', 'releases')
                .whereRaw('tags_associated.target_id = releases.id');
        })
        .andWhere('releases.date', '>', after)
        .andWhere('releases.date', '<=', before)
        .orderBy([{ column: 'date', order: 'desc' }, { column: 'created_at', order: 'desc' }])
        .limit(limit);
}

async function curateRelease(release) {
    const [actors, tags, media] = await Promise.all([
        knex('actors_associated')
            .select(
                'actors.id', 'actors.name', 'actors.gender', 'actors.slug', 'actors.birthdate',
                'birth_countries.alpha2 as birth_country_alpha2', 'birth_countries.name as birth_country_name', 'birth_countries.alias as birth_country_alias',
                'media.thumbnail as avatar',
            )
            .where({ release_id: release.id })
            .leftJoin('actors', 'actors.id', 'actors_associated.actor_id')
            .leftJoin('countries as birth_countries', 'actors.birth_country_alpha2', 'birth_countries.alpha2')
            .leftJoin('media', (builder) => {
                builder
                    .on('media.target_id', 'actors.id')
                    .andOnVal('media.domain', 'actors')
                    .andOnVal('media.index', '0');
            })
            .orderBy('actors.gender'),
        knex('tags_associated')
            .select('tags.name', 'tags.slug')
            .where({
                domain: 'releases',
                target_id: release.id,
            })
            .leftJoin('tags', 'tags.id', 'tags_associated.tag_id')
            .orderBy('tags.priority', 'desc'),
        knex('media')
            .where({
                target_id: release.id,
                domain: 'releases',
            })
            .orderBy(['role', 'index']),
    ]);

    const curatedRelease = {
        id: release.id,
        type: release.type,
        title: release.title,
        date: release.date,
        dateAdded: release.created_at,
        description: release.description,
        url: release.url,
        shootId: release.shoot_id,
        entryId: release.entry_id,
        actors: actors.map(actor => ({
            id: actor.id,
            slug: actor.slug,
            name: actor.name,
            gender: actor.gender,
            birthdate: actor.birthdate,
            age: moment().diff(actor.birthdate, 'years'),
            ageThen: moment(release.date).diff(actor.birthdate, 'years'),
            avatar: actor.avatar,
            origin: actor.birth_country_alpha2
                ? {
                    country: {
                        name: actor.birth_country_alias,
                        alpha2: actor.birth_country_alpha2,
                    },
                }
                : null,
        })),
        director: release.director,
        tags,
        duration: release.duration,
        photos: media.filter(item => item.role === 'photo'),
        poster: media.filter(item => item.role === 'poster')[0],
        covers: media.filter(item => item.role === 'cover'),
        trailer: media.filter(item => item.role === 'trailer')[0],
        site: {
            id: release.site_id,
            name: release.site_name,
            independent: release.site_parameters
                ? (JSON.parse(release.site_parameters).independent || false)
                : false,
            slug: release.site_slug,
            url: release.site_url,
        },
        studio: release.studio_id
            ? {
                id: release.studio_id,
                name: release.studio_name,
                slug: release.studio_slug,
                url: release.studio_url,
            }
            : null,
        network: {
            id: release.network_id,
            name: release.network_name,
            description: release.network_description,
            slug: release.network_slug,
            url: release.network_url,
        },
    };

    return curatedRelease;
}

function curateReleases(releases) {
    return Promise.all(releases.map(async release => curateRelease(release)));
}

async function attachChannelSite(release) {
    if (!release.site.isFallback) {
        return release;
    }

    if (!release.channel) {
        throw new Error(`Unable to derive channel site from generic URL: ${release.url}`);
    }

    const [site] = await fetchSites({
        name: release.channel,
        slug: release.channel,
    });

    if (site) {
        return {
            ...release,
            site,
        };
    }

    try {
        const urlSite = await findSiteByUrl(release.channel);

        return {
            ...release,
            site: urlSite,
        };
    } catch (error) {
        throw new Error(`Unable to derive channel site from generic URL: ${release.url}`);
    }
}

async function attachStudio(release) {
    if (!release.studio) {
        return release;
    }

    const studio = await knex('studios')
        .where('name', release.studio)
        .orWhere('slug', release.studio)
        .orWhere('url', release.studio)
        .first();

    return {
        ...release,
        studio,
    };
}

async function curateReleaseEntry(release) {
    const slug = slugify(release.title, {
        encode: true,
        limit: config.titleSlugLength,
    });

    const curatedRelease = {
        site_id: release.site.id,
        studio_id: release.studio ? release.studio.id : null,
        shoot_id: release.shootId || null,
        entry_id: release.entryId || null,
        parent_id: release.parentId,
        type: release.type,
        url: release.url,
        title: release.title,
        slug,
        date: release.date,
        description: release.description,
        // director: release.director,
        duration: release.duration,
        // likes: release.rating && release.rating.likes,
        // dislikes: release.rating && release.rating.dislikes,
        // rating: release.rating && release.rating.stars && Math.floor(release.rating.stars),
        deep: typeof release.deep === 'boolean' ? release.deep : false,
    };

    return curatedRelease;
}

async function fetchReleases(queryObject = {}, options = {}) {
    const releases = await knex('releases')
        .modify(commonQuery, options)
        .andWhere(builder => whereOr(queryObject, 'releases', builder));

    return curateReleases(releases);
}

async function fetchSiteReleases(queryObject, options = {}) {
    const releases = await knex('releases')
        .modify(commonQuery, options)
        .where(builder => whereOr(queryObject, 'sites', builder));

    return curateReleases(releases);
}

async function fetchNetworkReleases(queryObject, options = {}) {
    const releases = await knex('releases')
        .modify(commonQuery, options)
        .where(builder => whereOr(queryObject, 'networks', builder));

    return curateReleases(releases);
}

async function fetchActorReleases(queryObject, options = {}) {
    const releases = await knex('actors_associated')
        .leftJoin('releases', 'actors_associated.release_id', 'releases.id')
        .leftJoin('actors', 'actors_associated.actor_id', 'actors.id')
        .select(
            'actors.name as actor_name',
        )
        .modify(commonQuery, options)
        .where(builder => whereOr(queryObject, 'actors', builder));

    return curateReleases(releases);
}

async function fetchTagReleases(queryObject, options = {}) {
    const releases = await knex('tags_associated')
        .leftJoin('releases', 'tags_associated.target_id', 'releases.id')
        .leftJoin('tags', 'tags_associated.tag_id', 'tags.id')
        .select(
            'tags.name as tag_name',
        )
        .modify(commonQuery, options)
        .where('tags_associated.domain', 'releases')
        .where(builder => whereOr(queryObject, 'tags', builder));

    return curateReleases(releases);
}

function accumulateActors(releases) {
    return releases.reduce((acc, release) => {
        if (!Array.isArray(release.actors)) return acc;

        release.actors.forEach((actor) => {
            const actorName = actor.name ? actor.name.trim() : actor.trim();

            if (!acc[actorName]) acc[actorName] = [];
            acc[actorName].push(release.id);
        });

        return acc;
    }, {});
}

function accumulateMovies(releases) {
    return releases.reduce((acc, release) => {
        if (release.movie) {
            if (acc[release.movie]) {
                acc[release.movie] = acc[release.movie].concat(release.id);
                return acc;
            }

            acc[release.movie] = [release.id];
        }

        return acc;
    }, {});
}

async function storeReleaseAssets(releases) {
    // await storeReleasePhotos(releases);

    await Promise.map(releases, async (release) => {
        const subpath = `${release.site.network.slug}/${release.site.slug}/${release.id}/`;
        const identifier = `"${release.title}" (${release.id})`;

        try {
            await createMediaDirectory('releases', subpath);

            // don't use Promise.all to prevent concurrency issues with duplicate detection
            if (release.poster) {
                await storePhotos([release.poster], {
                    role: 'poster',
                    targetId: release.id,
                    subpath,
                }, identifier);
            }

            await storePhotos(release.photos, {
                targetId: release.id,
                subpath,
                primaryRole: release.poster ? null : 'poster',
            }, identifier);

            await storePhotos(release.covers, {
                role: 'cover',
                targetId: release.id,
                subpath,
            }, identifier);

            await storeTrailer(release.trailer, {
                targetId: release.id,
                subpath,
                role: 'trailer',
            }, identifier);

            await storeTrailer(release.teaser, {
                targetId: release.id,
                subpath,
                role: 'teaser',
            }, identifier);
        } catch (error) {
            logger.error(error.message);
        }
    }, {
        concurrency: 10,
    });
}

async function storeRelease(release) {
    const existingRelease = await knex('releases')
        .where({
            entry_id: release.entryId,
            site_id: release.site.id,
        })
        .first();
    const curatedRelease = await curateReleaseEntry(release);

    if (existingRelease && !argv.redownload) {
        return existingRelease.id;
    }

    if (existingRelease && argv.redownload) {
        const [updatedRelease] = await knex('releases')
            .where('id', existingRelease.id)
            .update({
                ...existingRelease,
                ...curatedRelease,
            })
            .returning('*');

        if (updatedRelease) {
            await associateTags(release, updatedRelease.id);
            logger.info(`Updated release "${release.title}" (${existingRelease.id}, ${release.site.name})`);
        }

        await associateTags(release, existingRelease.id);

        return existingRelease.id;
    }

    const [releaseEntry] = await knex('releases')
        .insert(curatedRelease)
        .returning('*');

    await associateTags(release, releaseEntry.id);

    logger.info(`Stored release "${release.title}" (${releaseEntry.id}, ${release.site.name})`);

    return releaseEntry;
}

async function storeReleases(releases) {
    const storedReleases = await Promise.map(releases, async (release) => {
        try {
            const releaseWithChannelSite = await attachChannelSite(release);
            const releaseWithStudio = await attachStudio(releaseWithChannelSite);
            const { id, slug } = await storeRelease(releaseWithStudio);

            return {
                id,
                slug,
                ...releaseWithChannelSite,
            };
        } catch (error) {
            logger.error(error.message);

            return null;
        }
    }, {
        concurrency: 10,
    }).filter(release => release);

    const actors = accumulateActors(storedReleases);
    const movies = accumulateMovies(storedReleases);

    await Promise.all([
        associateActors(actors, storedReleases),
        storeReleaseAssets(storedReleases),
    ]);

    if (argv.withProfiles && Object.keys(actors).length > 0) {
        await scrapeBasicActors();
    }

    return {
        releases: storedReleases,
        actors,
        movies,
    };
}

module.exports = {
    fetchReleases,
    fetchActorReleases,
    fetchSiteReleases,
    fetchNetworkReleases,
    fetchTagReleases,
    storeRelease,
    storeReleases,
};