'use strict';

const config = require('config');
const Promise = require('bluebird');
const { decode } = require('html-entities');

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 chunk = require('./utils/chunk');
const { formatDate } = require('./utils/qu');
const { associateActors, associateDirectors, scrapeActors, toBaseActors } = require('./actors');
const { associateReleaseTags } = require('./tags');
const { curateEntity } = require('./entities');
const { associateReleaseMedia } = require('./media');
const { updateSceneSearch, updateMovieSearch } = require('./update-search');
const { notify } = require('./alerts');

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: decode(release.title),
		alt_titles: release.altTitles?.map((title) => decode(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: decode(release.description),
		comment: release.comment,
		photo_count: Number(release.photoCount) || null,
		deep: typeof release.deep === 'boolean' ? release.deep : false,
		deep_url: release.deepUrl,
		updated_batch_id: batchId,
	};

	if (release.id) {
		// release is updated
		curatedRelease.id = release.id;
	}

	if (type === 'scene') {
		curatedRelease.shoot_id = release.shootId || null;
		curatedRelease.production_date = Number(release.productionDate) ? release.productionDate : null;
		curatedRelease.duration = Number(release.duration) || null;
		curatedRelease.qualities = Array.from(new Set(release.qualities?.map(Number).filter(Boolean))).sort((qualityA, qualityB) => qualityB - qualityA);
	}

	if (release.productionLocation) {
		curatedRelease.production_location = decode(release.productionLocation);

		if (argv.resolvePlace) {
			const productionLocation = await resolvePlace(decode(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, batchId) {
	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 entity available for ${release.url}`);
			return null;
		}

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

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

		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 internalUniqueReleaseChunks = chunk(internalUniqueReleases);

	const duplicateReleaseEntryChunks = await Promise.map(internalUniqueReleaseChunks, async (internalUniqueReleasesChunk) => knex('releases')
		.whereIn(['entry_id', 'entity_id'], internalUniqueReleasesChunk.map((release) => [release.entryId, release.entity.id]))
		.orWhereIn(['entry_id', 'entity_id'], internalUniqueReleasesChunk
			// scene IDs shared across network, mark as duplicate so scene can be updated with channel if only available on release day (i.e. Perv City)
			.filter((release) => release.entity.parent?.parameters?.networkEntryIds)
			.map((release) => [release.entryId, release.entity.parent.id])), { concurrency: 10 });

	const duplicateReleaseEntries = duplicateReleaseEntryChunks.flat();

	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]
		|| duplicateReleasesByEntityIdAndEntryId[release.entity.parent?.id]?.[release.entryId]);

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

	return {
		uniqueReleases,
		duplicateReleases,
		duplicateReleaseEntries,
	};
}

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 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]
			|| moviesByEntityIdAndEntryId[scene.entity.parent?.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 associateSerieScenes(series, serieScenes) {
	const seriesByEntityIdAndEntryId = series.reduce((acc, serie) => ({
		...acc,
		[serie.entity.id]: {
			...acc[serie.entity.id],
			[serie.entryId]: serie,
		},
	}), {});

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

		const sceneSerie = seriesByEntityIdAndEntryId[scene.entity.id]?.[scene.serie.entryId]
			|| seriesByEntityIdAndEntryId[scene.entity.parent?.id]?.[scene.serie.entryId];

		if (sceneSerie?.id) {
			return {
				serie_id: sceneSerie.id,
				scene_id: scene.id,
			};
		}

		return null;
	}).filter(Boolean);

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

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

	const { uniqueReleases } = await filterDuplicateReleases(movies);
	const [{ id: batchId }] = useBatchId ? [{ id: useBatchId }] : await knex('batches').insert({ showcased: argv.showcased, 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 updateMovieSearch(moviesWithId.map((movie) => movie.id));
	await associateReleaseMedia(moviesWithId, 'movie');

	return moviesWithId;
}

async function storeSeries(series, useBatchId) {
	if (!series || series.length === 0) {
		return [];
	}

	const { uniqueReleases } = await filterDuplicateReleases(series);
	const [{ id: batchId }] = useBatchId ? [{ id: useBatchId }] : await knex('batches').insert({ showcased: argv.showcased, comment: null }).returning('id');

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

	const storedSeries = await bulkInsert('series', curatedSerieEntries, ['entity_id', 'entry_id'], true);
	const seriesWithId = attachReleaseIds(series, storedSeries);

	await updateMovieSearch(seriesWithId.map((serie) => serie.id), 'serie');
	await associateReleaseMedia(seriesWithId, 'serie');

	return seriesWithId;
}

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

	const [{ id: batchId }] = useBatchId ? [{ id: useBatchId }] : await knex('batches').insert({ showcased: argv.showcased, 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 uniqueReleasesWithId = attachReleaseIds(uniqueReleases, storedReleaseEntries, batchId);
	const duplicateReleasesWithId = attachReleaseIds(duplicateReleases, duplicateReleaseEntries, batchId);
	const curatedDuplicateReleases = await Promise.all(duplicateReleasesWithId.map((release) => curateReleaseEntry(release, batchId)));
	const releasesWithId = uniqueReleasesWithId.concat(duplicateReleasesWithId);

	const updated = await knex.raw(`
		UPDATE releases
		SET url = COALESCE(new.url, releases.url),
		date = COALESCE(new.date, releases.date),
		entity_id = COALESCE((new.entity->>'id')::integer, releases.entity_id),
		title = COALESCE(new.title, releases.title),
		description = COALESCE(new.description, releases.description),
		duration = COALESCE(new.duration, releases.duration),
		deep = new.url IS NOT NULL,
		updated_at = NOW()
		FROM json_to_recordset(:scenes)
		AS new(id int, url text, date timestamptz, entity json, title text, description text, duration integer, deep boolean)
		WHERE releases.id = new.id
	`, {
		scenes: JSON.stringify(curatedDuplicateReleases),
	});

	const [actors, storedSeries] = await Promise.all([
		associateActors(releasesWithId, batchId),
		storeSeries(releasesWithId.map((release) => release.serie && { ...release.serie, entity: release.entity }).filter(Boolean), batchId),
		associateReleaseTags(releasesWithId),
		storeChapters(releasesWithId),
	]);

	await associateSerieScenes(storedSeries, releasesWithId);
	await associateDirectors(releasesWithId, batchId); // some directors may also be actors, don't associate at the same time
	await updateSceneSearch(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}, updated ${updated.rowCount} releases`);

	await notify(releasesWithId);

	return releasesWithId;
}

module.exports = {
	associateMovieScenes,
	storeScenes,
	storeMovies,
	updateSceneSearch,
	updateMovieSearch,
};