'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 bulkInsert = require('./utils/bulk-insert');
const resolvePlace = require('./utils/resolve-place');
const { formatDate } = require('./utils/qu');
const { associateActors, associateDirectors, scrapeActors, toBaseActors } = require('./actors');
const { associateReleaseTags } = require('./tags');
const { curateEntity } = require('./entities');
const { associateReleaseMedia } = require('./media');

async 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 (release.productionLocation) {
		curatedRelease.production_location = release.productionLocation;

		if (argv.resolvePlace) {
			const productionLocation = await resolvePlace(release.productionLocation);

			if (productionLocation) {
				curatedRelease.production_city = productionLocation.city;
				curatedRelease.production_state = productionLocation.state;
				curatedRelease.production_country_alpha2 = productionLocation.country;
			}
		}
	}

	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) => {
		if (!release.entity) {
			logger.error(`No entitity available for ${release.url}`);
			return null;
		}

		const id = storedReleaseIdsByEntityIdAndEntryId[release.entity.id]?.[release.entryId];

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

		return null;
	}).filter(Boolean);

	return releasesWithId;
}

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

		if (!release.entryId) {
			logger.warn(`No entry ID supplied for "${release.title}" from '${release.entity.name}'`);

			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 notifyAlerts(scenes) {
	const releases = await knex.raw(`
		SELECT alerts.id as alert_id, alerts.notify, alerts.email, releases.id as scene_id, users.id as user_id
		FROM releases
		CROSS JOIN alerts
		LEFT JOIN users ON users.id = alerts.user_id
		LEFT JOIN releases_tags ON releases_tags.release_id = releases.id
		/* match updated IDs from input */
		WHERE (releases.id = ANY(:sceneIds))
		/* match tags */
		AND (NOT EXISTS (SELECT alerts_tags.alert_id
			FROM alerts_tags
			WHERE alerts_tags.alert_id = alerts.id)
		OR (SELECT array_agg(releases_tags.tag_id)
			FROM releases_tags
			WHERE releases_tags.release_id = releases.id
			GROUP BY releases_tags.release_id)
		@> (SELECT array_agg(alerts_tags.tag_id)
			FROM alerts_tags
			WHERE alerts_tags.alert_id = alerts.id
			GROUP BY alerts_tags.alert_id))
		/* match actors */
		AND (NOT EXISTS (SELECT alerts_actors.alert_id
			FROM alerts_actors
			WHERE alerts_actors.alert_id = alerts.id)
		OR (SELECT array_agg(releases_actors.actor_id)
			FROM releases_actors
			WHERE releases_actors.release_id = releases.id
			GROUP BY releases_actors.release_id)
		@> (SELECT array_agg(alerts_actors.actor_id)
			FROM alerts_actors
			WHERE alerts_actors.alert_id = alerts.id
			GROUP BY alerts_actors.alert_id))
		/* match entity */
		AND ((NOT EXISTS (SELECT alerts_entities.entity_id
			FROM alerts_entities
			WHERE alerts_entities.alert_id = alerts.id))
		OR (releases.entity_id
		= ANY(array(SELECT alerts_entities.entity_id
			FROM alerts_entities
			WHERE alerts_entities.alert_id = alerts.id))))
		GROUP BY releases.id, users.id, alerts.id;
	`, { sceneIds: scenes.map(scene => scene.id) });

	const notify = releases.rows.filter(alert => alert.notify);

	await knex('notifications')
		.insert(notify.map(notification => ({
			user_id: notification.user_id,
			alert_id: notification.alert_id,
			scene_id: notification.scene_id,
		})));

	return releases.rows;
}

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(
                'english',
                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(directors.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_directors AS local_directors ON local_directors.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 actors AS directors ON local_directors.director_id = directors.id
        LEFT JOIN tags ON local_tags.tag_id = tags.id AND tags.priority >= 6
        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) {
		await bulkInsert('releases_search', documents.rows, ['release_id']);
	}
}

async function storeChapters(releases) {
	const chapters = releases
		.map(release => release.chapters?.map((chapter, index) => ({
			releaseId: release.id,
			index: index + 1,
			time: chapter.time,
			duration: chapter.duration,
			title: chapter.title,
			description: chapter.description,
			poster: chapter.poster,
			photos: chapter.photos,
			tags: chapter.tags,
		})))
		.flat()
		.filter(Boolean)
		.sort((chapterA, chapterB) => chapterA.time - chapterB.time);

	const curatedChapterEntries = chapters.map(chapter => ({
		index: chapter.index,
		time: chapter.time,
		duration: chapter.duration,
		title: chapter.title,
		description: chapter.description,
		release_id: chapter.releaseId,
	}));

	const storedChapters = await bulkInsert('chapters', curatedChapterEntries, ['release_id', 'index']);

	const chapterIdsByReleaseIdAndChapter = storedChapters.reduce((acc, chapter) => ({
		...acc,
		[chapter.release_id]: {
			...acc[chapter.release_id],
			[chapter.index]: chapter.id,
		},
	}), {});

	const chaptersWithId = chapters.map(chapter => ({
		...chapter,
		id: chapterIdsByReleaseIdAndChapter[chapter.releaseId][chapter.index],
	}));

	await associateReleaseTags(chaptersWithId, 'chapter');

	// media is more error-prone, associate separately
	await associateReleaseMedia(chaptersWithId, 'chapter');
}

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

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

	const releasesWithChannels = await attachChannelEntities(releases);
	const releasesWithBaseActors = releasesWithChannels.map(release => ({ ...release, actors: toBaseActors(release.actors) }));
	const releasesWithStudios = await attachStudios(releasesWithBaseActors);

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

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

	const storedReleases = await bulkInsert('releases', curatedNewReleaseEntries);

	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),
		storeChapters(releasesWithId),
	]);

	await associateDirectors(releasesWithId, batchId); // some directors may also be actors, don't associate at the same time
	await updateReleasesSearch(releasesWithId.map(release => release.id));

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

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

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

	await notifyAlerts(releasesWithId);

	return releasesWithId;
}

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

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

		const sceneMovie = moviesByEntityIdAndEntryId[scene.entity.id]?.[scene.movie.entryId];

		if (sceneMovie?.id) {
			return {
				movie_id: sceneMovie.id,
				scene_id: scene.id,
			};
		}

		return null;
	}).filter(Boolean);

	await bulkInsert('movies_scenes', associations, false);
}

async function storeMovies(movies) {
	if (!movies || movies.length === 0) {
		return [];
	}

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

	const curatedMovieEntries = await Promise.all(uniqueReleases.map(release => curateReleaseEntry(release, batchId, null, 'movie')));

	const storedMovies = await bulkInsert('movies', curatedMovieEntries, ['entity_id', 'entry_id'], true);
	const moviesWithId = attachReleaseIds(movies, storedMovies);

	await associateReleaseMedia(moviesWithId, 'movie');

	return moviesWithId;
}

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