'use strict';

const config = require('config');

const argv = require('./argv');
const logger = require('./logger')(__filename);
const knex = require('./knex');
const slugify = require('./utils/slugify');
const { formatDate } = require('./utils/qu');
const { associateActors, scrapeActors } = require('./actors');
const { associateReleaseTags } = require('./tags');
const { curateEntity } = require('./entities');
const { associateReleaseMedia } = require('./media');

function curateReleaseEntry(release, batchId, existingRelease, type = 'scene') {
	const slugBase = release.title
		|| (release.actors?.length && `${release.entity.slug} ${release.actors.map(actor => actor.name).join(' ')}`)
		|| (release.date && `${release.entity.slug} ${formatDate(release.date, 'YYYY MM DD')}`)
		|| null;

	const slug = slugify(slugBase, '-', {
		encode: true,
		limit: config.titleSlugLength,
	});

	const curatedRelease = {
		title: release.title,
		entry_id: release.entryId || null,
		entity_id: release.entity.id,
		studio_id: release.studio?.id || null,
		url: release.url,
		date: Number(release.date) ? release.date : null,
		date_precision: release.datePrecision,
		slug,
		description: release.description,
		comment: release.comment,
		// director: release.director,
		// 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,
		deep_url: release.deepUrl,
		updated_batch_id: batchId,
	};

	if (type === 'scene') {
		curatedRelease.shoot_id = release.shootId || null;
		curatedRelease.production_date = Number(release.productionDate) ? release.productionDate : null;
		curatedRelease.duration = release.duration;
	}

	if (!existingRelease && !release.id) {
		curatedRelease.created_batch_id = batchId;
	}

	return curatedRelease;
}

async function attachChannelEntities(releases) {
	const releasesWithoutEntity = releases.filter(release => release.channel && (!release.entity || release.entity.type === 'network'));

	const channelEntities = await knex('entities')
		.select(knex.raw('entities.*, row_to_json(parents) as parent'))
		.whereIn('entities.slug', releasesWithoutEntity.map(release => release.channel))
		.where('entities.type', 'channel')
		.leftJoin('entities AS parents', 'parents.id', 'entities.parent_id');

	const channelEntitiesBySlug = channelEntities.reduce((acc, entity) => ({ ...acc, [entity.slug]: entity }), {});

	const releasesWithChannelEntity = await Promise.all(releases
		.map(async (release) => {
			if (release.channel && channelEntitiesBySlug[release.channel]) {
				const curatedEntity = await curateEntity(channelEntitiesBySlug[release.channel]);

				return {
					...release,
					entity: curatedEntity,
				};
			}

			if (release.entity) {
				return release;
			}

			logger.error(`Unable to match channel '${release.channel?.slug || release.channel}' from generic URL ${release.url}`);

			return null;
		}));

	return releasesWithChannelEntity.filter(Boolean);
}

async function attachStudios(releases) {
	const studioSlugs = releases.map(release => release.studio).filter(Boolean);

	const studios = await knex('entities')
		.whereIn('slug', studioSlugs)
		.where('type', 'studio');

	const studioBySlug = studios.reduce((acc, studio) => ({ ...acc, [studio.slug]: studio }), {});

	const releasesWithStudio = releases.map((release) => {
		if (release.studio && studioBySlug[release.studio]) {
			return {
				...release,
				studio: studioBySlug[release.studio],
			};
		}

		if (release.studio) {
			logger.warn(`Unable to match studio '${release.studio}' for ${release.url}`);
		}

		return release;
	});

	return releasesWithStudio;
}

function attachReleaseIds(releases, storedReleases) {
	const storedReleaseIdsByEntityIdAndEntryId = storedReleases.reduce((acc, release) => {
		if (!acc[release.entity_id]) acc[release.entity_id] = {};
		acc[release.entity_id][release.entry_id] = release.id;

		return acc;
	}, {});

	const releasesWithId = releases.map(release => ({
		...release,
		id: storedReleaseIdsByEntityIdAndEntryId[release.entity.id][release.entryId],
	}));

	return releasesWithId;
}

function filterInternalDuplicateReleases(releases) {
	const releasesByEntityIdAndEntryId = releases.reduce((acc, release) => {
		if (!release.entity) {
			return acc;
		}

		if (!acc[release.entity.id]) {
			acc[release.entity.id] = {};
		}

		acc[release.entity.id][release.entryId] = release;

		return acc;
	}, {});

	return Object.values(releasesByEntityIdAndEntryId)
		.map(entityReleases => Object.values(entityReleases))
		.flat();
}

async function filterDuplicateReleases(releases) {
	const internalUniqueReleases = filterInternalDuplicateReleases(releases);

	const duplicateReleaseEntries = await knex('releases')
		.whereIn(['entry_id', 'entity_id'], internalUniqueReleases.map(release => [release.entryId, release.entity.id]));

	const duplicateReleasesByEntityIdAndEntryId = duplicateReleaseEntries.reduce((acc, release) => {
		if (!acc[release.entity_id]) acc[release.entity_id] = {};
		acc[release.entity_id][release.entry_id] = true;

		return acc;
	}, {});

	const duplicateReleases = internalUniqueReleases.filter(release => duplicateReleasesByEntityIdAndEntryId[release.entity.id]?.[release.entryId]);
	const uniqueReleases = internalUniqueReleases.filter(release => !duplicateReleasesByEntityIdAndEntryId[release.entity.id]?.[release.entryId]);

	return {
		uniqueReleases,
		duplicateReleases,
		duplicateReleaseEntries,
	};
}

async function updateReleasesSearch(releaseIds) {
	logger.info(`Updating search documents for ${releaseIds ? releaseIds.length : 'all' } releases`);

	const documents = await knex.raw(`
        SELECT
            releases.id AS release_id,
            TO_TSVECTOR(
                'traxxx',
                COALESCE(releases.title, '') || ' ' ||
                entities.name || ' ' ||
                entities.slug || ' ' ||
                COALESCE(array_to_string(entities.alias, ' '), '') || ' ' ||
                COALESCE(parents.name, '') || ' ' ||
                COALESCE(parents.slug, '') || ' ' ||
                COALESCE(array_to_string(parents.alias, ' '), '') || ' ' ||
                COALESCE(releases.shoot_id, '') || ' ' ||
                COALESCE(TO_CHAR(releases.date, 'YYYY YY MM FMMM FMmonth mon DD FMDD'), '') || ' ' ||
                STRING_AGG(COALESCE(actors.name, ''), ' ') || ' ' ||
                STRING_AGG(COALESCE(tags.name, ''), ' ') || ' ' ||
                STRING_AGG(COALESCE(tags_aliases.name, ''), ' ')
            ) as document
        FROM releases
        LEFT JOIN entities ON releases.entity_id = entities.id
        LEFT JOIN entities AS parents ON parents.id = entities.parent_id
        LEFT JOIN releases_actors AS local_actors ON local_actors.release_id = releases.id
        LEFT JOIN releases_tags AS local_tags ON local_tags.release_id = releases.id
        LEFT JOIN actors ON local_actors.actor_id = actors.id
        LEFT JOIN tags ON local_tags.tag_id = tags.id AND tags.priority >= 7
        LEFT JOIN tags as tags_aliases ON local_tags.tag_id = tags_aliases.alias_for AND tags_aliases.secondary = true
        ${releaseIds ? 'WHERE releases.id = ANY(?)' : ''}
        GROUP BY releases.id, entities.name, entities.slug, entities.alias, parents.name, parents.slug, parents.alias;
    `, releaseIds && [releaseIds]);

	if (documents.rows?.length > 0) {
		const query = knex('releases_search').insert(documents.rows).toString();
		await knex.raw(`${query} ON CONFLICT (release_id) DO UPDATE SET document = EXCLUDED.document`);
	}
}

async function storeScenes(releases) {
	if (releases.length === 0) {
		return [];
	}

	const [batchId] = await knex('batches').insert({ comment: null }).returning('id');

	const releasesWithChannels = await attachChannelEntities(releases);
	const releasesWithStudios = await attachStudios(releasesWithChannels);

	// uniqueness is entity ID + entry ID, filter uniques after adding entities
	const { uniqueReleases, duplicateReleases, duplicateReleaseEntries } = await filterDuplicateReleases(releasesWithStudios);

	const curatedNewReleaseEntries = uniqueReleases.map(release => curateReleaseEntry(release, batchId));

	const storedReleases = await knex.batchInsert('releases', curatedNewReleaseEntries).returning('*');
	// TODO: update duplicate releases

	const storedReleaseEntries = Array.isArray(storedReleases) ? storedReleases : [];
	const releasesWithId = attachReleaseIds([].concat(uniqueReleases, duplicateReleases), [].concat(storedReleaseEntries, duplicateReleaseEntries));

	const [actors] = await Promise.all([
		associateActors(releasesWithId, batchId),
		associateReleaseTags(releasesWithId),
	]);

	await updateReleasesSearch(releasesWithId.map(release => release.id));

	// media is more error-prone, associate separately
	await associateReleaseMedia(releasesWithId);

	if (argv.sceneActors) {
		await scrapeActors(actors.map(actor => actor.name));
	}

	logger.info(`Stored ${storedReleaseEntries.length} releases`);

	return releasesWithId;
}

async function associateMovieScenes(movies, movieScenes) {
	const movieScenesByEntityIdAndEntryId = movieScenes.reduce((acc, scene) => ({
		...acc,
		[scene.entity.id]: {
			...acc[scene.entity.id],
			[scene.entryId]: scene,
		},
	}), {});

	const associations = movies.map((movie) => {
		if (!movie.scenes) {
			return null;
		}

		return movie.scenes.map((scene) => {
			const movieScene = movieScenesByEntityIdAndEntryId[movie.entity.id]?.[scene.entryId];

			if (movieScene) {
				return {
					movie_id: movie.id,
					scene_id: movieScene.id,
				};
			}

			return null;
		});
	}).flat().filter(Boolean);

	await knex.batchInsert('movies_scenes', associations);
}

async function storeMovies(movies, movieScenes) {
	const { uniqueReleases } = await filterDuplicateReleases(movies);
	const [batchId] = await knex('batches').insert({ comment: null }).returning('id');

	const curatedMovieEntries = uniqueReleases.map(release => curateReleaseEntry(release, batchId, null, 'movie'));
	const storedMovies = await knex.batchInsert('movies', curatedMovieEntries).returning('*');

	const moviesWithId = attachReleaseIds(movies, storedMovies);

	await associateMovieScenes(moviesWithId, movieScenes);
	await associateReleaseMedia(moviesWithId, 'movies');

	return storedMovies;
}

module.exports = {
	storeScenes,
	storeMovies,
	updateReleasesSearch,
};