'use strict';

const logger = require('./logger')(__filename);
const knex = require('./knex');
const slugify = require('./utils/slugify');
const capitalize = require('./utils/capitalize');

function toBaseActors(actorsOrNames, release) {
    return actorsOrNames.map((actorOrName) => {
        const name = capitalize(actorOrName.name || actorOrName);
        const slug = slugify(name);

        const baseActor = {
            name,
            slug,
            hasSingleName: name.split(/\s+/).length === 1,
            network: release.site.network,
            slugWithNetworkSlug: `${slug}-${release.site.network.slug}`,
        };

        if (actorOrName.name) {
            return {
                ...actorOrName,
                ...baseActor,
            };
        }

        return baseActor;
    });
}

function curateActorEntry(baseActor) {
    if (baseActor.hasSingleName) {
        logger.warn(`Assigning single name actor '${baseActor.name}' to network '${baseActor.network.name}'`);

        // attach network ID to allow separating actors with the same name
        return {
            name: baseActor.name,
            slug: baseActor.slugWithNetworkSlug,
            network_id: baseActor.network.id,
        };
    }

    return {
        name: baseActor.name,
        slug: baseActor.slug,
    };
}

function curateActorEntries(baseActors) {
    return baseActors.map(baseActor => curateActorEntry(baseActor));
}

async function getOrCreateActors(baseActors) {
    const existingActors = await knex('actors')
        .select('id', 'name', 'slug', 'network_id')
        .whereIn('slug', baseActors.map(baseActor => baseActor.slug))
        .whereNull('network_id')
        .orWhereIn(['slug', 'network_id'], baseActors.map(baseActor => [baseActor.slugWithNetworkSlug, baseActor.network.id]));

    const existingActorSlugs = new Set(existingActors.map(actor => actor.slug));
    const uniqueBaseActors = baseActors.filter(baseActor => !existingActorSlugs.has(baseActor.slug) && !existingActorSlugs.has(baseActor.slugWithNetworkSlug));

    const curatedActorEntries = curateActorEntries(uniqueBaseActors);
    const newActors = await knex('actors').insert(curatedActorEntries, ['id', 'name', 'slug', 'network_id']);

    if (Array.isArray(newActors)) {
        return newActors.concat(existingActors);
    }

    return existingActors;
}

async function associateActors(releases) {
    const baseActorsByReleaseId = releases.reduce((acc, release) => {
        if (release.actors) {
            acc[release.id] = toBaseActors(release.actors, release);
        }

        return acc;
    }, {});

    const baseActors = Object.values(baseActorsByReleaseId).flat();
    const baseActorsBySlug = baseActors.reduce((acc, baseActor) => ({ ...acc, [baseActor.slug]: baseActor }), {});
    const uniqueBaseActors = Object.values(baseActorsBySlug);

    const actors = await getOrCreateActors(uniqueBaseActors);
    const actorIdsBySlug = actors.reduce((acc, actor) => ({ ...acc, [actor.slug]: actor.id }), {});

    const releaseActorAssociations = Object.entries(baseActorsByReleaseId)
        .map(([releaseId, releaseActors]) => releaseActors
            .map(releaseActor => ({
                release_id: releaseId,
                actor_id: actorIdsBySlug[releaseActor.slug] || actorIdsBySlug[releaseActor.slugWithNetworkSlug],
            })))
        .flat();

    await knex.raw(`${knex('releases_actors').insert(releaseActorAssociations).toString()} ON CONFLICT DO NOTHING;`);
}

module.exports = {
    associateActors,
};