'use strict';

const config = require('config');
const util = require('util');
const Promise = require('bluebird');
const fs = require('fs');
const fsPromises = require('fs').promises;
const path = require('path');
const stream = require('stream');
const { nanoid } = require('nanoid/non-secure');
const mime = require('mime');
// const fileType = require('file-type');
const ffmpeg = require('fluent-ffmpeg');
const sharp = require('sharp');
const blake2 = require('blake2');
const taskQueue = require('promise-task-queue');
const AWS = require('aws-sdk');

const logger = require('./logger')(__filename);
const argv = require('./argv');
const knex = require('./knex');
const http = require('./utils/http');
const bulkInsert = require('./utils/bulk-insert');
const chunk = require('./utils/chunk');
const { get } = require('./utils/qu');

// const pipeline = util.promisify(stream.pipeline);
const streamQueue = taskQueue();

const endpoint = new AWS.Endpoint('s3.eu-central-1.wasabisys.com');

const s3 = new AWS.S3({
	// region: 'eu-central-1',
	endpoint,
	credentials: {
		accessKeyId: config.s3.accessKey,
		secretAccessKey: config.s3.secretKey,
	},
});

function sampleMedias(medias, limit = argv.mediaLimit, preferLast = true) {
	// limit media sets, use extras as fallbacks
	if (medias.length <= limit) {
		return medias;
	}

	const chunkSize = Math.floor(medias.length / limit);
	const rest = medias.length - (limit * chunkSize);

	const chunks = Array.from(
		{ length: limit },
		(value, index) => {
			const start = (chunkSize * index) + Math.min(index, rest);

			return medias.slice(
				start,
				start + chunkSize + (index < rest ? 1 : 0),
			);
		},
	);

	// flip last chunk so the very last image (often the best cumshot) is tried first
	const lastPreferredChunks = preferLast
		? chunks.slice(0, -1).concat(chunks.slice(-1).reverse())
		: chunks;

	const groupedMedias = lastPreferredChunks.map((mediaChunk) => {
		// merge chunked medias into single media with grouped fallback priorities,
		// so the first sources of each media is preferred over all second sources, etc.
		const sources = mediaChunk
			.reduce((accSources, media) => {
				media.sources.forEach((source, index) => {
					if (!accSources[index]) {
						accSources.push([source]);
						return;
					}

					accSources[index].push(source);
				});

				return accSources;
			}, [])
			.flat();

		return {
			id: mediaChunk[0].id,
			role: mediaChunk[0].role,
			sources,
		};
	});

	return groupedMedias;
}

function itemsByKey(items, key) {
	return items.reduce((acc, item) => ({ ...acc, [item[key]]: item }), {});
}

function isValidUrl(url) {
	try {
		const urlObject = new URL(url);

		return !!urlObject;
	} catch (error) {
		return false;
	}
}

function toBaseSource(rawSource) {
	if (rawSource && (rawSource.src || (rawSource.extract && rawSource.url) || rawSource.stream)) {
		const baseSource = {};

		if (rawSource.src) {
			if (!isValidUrl(rawSource.src)) {
				return null;
			}

			baseSource.src = rawSource.src;
		}

		if (rawSource.quality) baseSource.quality = rawSource.quality;
		if (rawSource.type) baseSource.type = rawSource.type;

		if (rawSource.url) {
			if (!isValidUrl(rawSource.url)) {
				return null;
			}

			baseSource.url = rawSource.url;
		}

		if (rawSource.extract) baseSource.extract = rawSource.extract;

		if (rawSource.expectType) baseSource.expectType = rawSource.expectType;

		if (rawSource.stream) {
			baseSource.src = rawSource.stream;
			baseSource.stream = rawSource.stream;
		}

		// reject source if response mimetype does not match specified type
		if (rawSource.verifyType) baseSource.verifyType = rawSource.verifyType;

		if (rawSource.referer) baseSource.referer = rawSource.referer;
		if (rawSource.host) baseSource.host = rawSource.host;
		if (rawSource.attempts) baseSource.attempts = rawSource.attempts;
		if (rawSource.interval) baseSource.interval = rawSource.interval;
		if (rawSource.concurrency) baseSource.concurrency = rawSource.concurrency;

		if (rawSource.vr) baseSource.vr = rawSource.vr;

		if (rawSource.credit !== undefined) baseSource.credit = rawSource.credit;
		if (rawSource.comment) baseSource.comment = rawSource.comment;
		if (rawSource.group) baseSource.group = rawSource.group;

		if (rawSource.process) baseSource.process = rawSource.process;

		return baseSource;
	}

	if (typeof rawSource === 'string') {
		if (!isValidUrl(rawSource)) {
			return null;
		}

		if (new URL(rawSource).pathname.match(/\.(m3u8)|(mpd)$/)) {
			return {
				src: rawSource,
				stream: rawSource,
			};
		}

		return {
			src: rawSource,
		};
	}

	if (typeof rawSource === 'function') {
		return {
			defer: rawSource,
		};
	}

	return null;
}

function baseSourceToBaseMedia(baseSource, role, metadata) {
	if (Array.isArray(baseSource)) {
		if (baseSource.length > 0) {
			return {
				...metadata,
				id: nanoid(),
				role,
				sources: baseSource,
			};
		}

		return null;
	}

	if (baseSource) {
		return {
			...metadata,
			id: nanoid(),
			role,
			sources: [baseSource],
		};
	}

	return null;
}

function sortBaseTrailersByQuality(sources, role) {
	if (role === 'trailers') {
		const sortedSources = sources.sort((sourceA, sourceB) => {
			if (config.media.trailerQuality.includes(sourceB.quality) && config.media.trailerQuality.indexOf(sourceA.quality) > config.media.trailerQuality.indexOf(sourceB.quality)) {
				return 1;
			}

			if (config.media.trailerQuality.includes(sourceA.quality) && config.media.trailerQuality.indexOf(sourceA.quality) < config.media.trailerQuality.indexOf(sourceB.quality)) {
				return -1;
			}

			return 0;
		});

		return sortedSources;
	}

	return sources;
}

function fallbackMediaToBaseMedia(rawMedia, role, metadata) {
	const baseSources = rawMedia
		.map((source) => toBaseSource(source))
		.filter(Boolean);

	const sortedBaseSources = sortBaseTrailersByQuality(baseSources, role);

	return baseSourceToBaseMedia(sortedBaseSources, role, metadata);
}

function toBaseMedias(rawMedias, role, metadata) {
	if (!rawMedias || rawMedias.length === 0) {
		return [];
	}

	const baseMedias = rawMedias.map((rawMedia) => {
		if (!rawMedia) {
			return null;
		}

		if (Array.isArray(rawMedia)) {
			// fallback sources provided
			return fallbackMediaToBaseMedia(rawMedia, role, metadata);
		}

		const baseSource = toBaseSource(rawMedia);

		return baseSourceToBaseMedia(baseSource, role, metadata);
	}).filter(Boolean);

	const sampledBaseMedias = sampleMedias(baseMedias);

	return sampledBaseMedias;
}

async function findSourceDuplicates(baseMedias) {
	const sourceUrls = baseMedias
		.map((baseMedia) => baseMedia.sources.map((source) => source.src))
		.flat()
		.filter(Boolean);

	const extractUrls = baseMedias
		.map((baseMedia) => baseMedia.sources.map((source) => source.extract))
		.flat()
		.filter(Boolean);

	const [existingSourceMedia, existingExtractMedia] = await Promise.all([
		// may try to check thousands of URLs at once, don't pass all of them to a single query
		chunk(sourceUrls).reduce(async (chain, sourceUrlsChunk) => {
			const accUrls = await chain;
			const existingUrls = await knex('media').whereIn('source', sourceUrlsChunk);

			return [...accUrls, ...existingUrls];
		}, []),
		chunk(extractUrls).reduce(async (chain, extractUrlsChunk) => {
			const accUrls = await chain;
			const existingUrls = await knex('media').whereIn('source_page', extractUrlsChunk);

			return [...accUrls, ...existingUrls];
		}, []),
	]);

	const existingSourceMediaByUrl = itemsByKey(existingSourceMedia, 'source');
	const existingExtractMediaByUrl = itemsByKey(existingExtractMedia, 'source_page');

	return {
		existingSourceMediaByUrl,
		existingExtractMediaByUrl,
	};
}

async function findHashDuplicates(medias) {
	const hashes = medias.map((media) => media.meta?.hash || media.entry?.hash).filter(Boolean);

	const existingHashMediaEntries = await chunk(hashes, 2).reduce(async (chain, hashesChunk) => {
		const accHashes = await chain;
		const existingHashes = await knex('media').whereIn('hash', hashesChunk);

		return [...accHashes, ...existingHashes];
	}, []);

	const existingHashMediaEntriesByHash = itemsByKey(existingHashMediaEntries, 'hash');
	const uniqueHashMedias = medias.filter((media) => !media.entry && !existingHashMediaEntriesByHash[media.meta?.hash]);

	const { selfDuplicateMedias, selfUniqueMediasByHash } = uniqueHashMedias.reduce((acc, media) => {
		if (!media.meta?.hash) {
			return acc;
		}

		if (acc.selfUniqueMediasByHash[media.meta.hash]) {
			acc.selfDuplicateMedias.push({
				...media,
				use: acc.selfUniqueMediasByHash[media.meta.hash].id,
			});

			return acc;
		}

		acc.selfUniqueMediasByHash[media.meta.hash] = media;

		return acc;
	}, {
		selfDuplicateMedias: [],
		selfUniqueMediasByHash: {},
	});

	const selfUniqueHashMedias = Object.values(selfUniqueMediasByHash);

	const existingHashMedias = medias
		.filter((media) => existingHashMediaEntriesByHash[media.entry?.hash || media.meta?.hash])
		.map((media) => ({
			...media,
			entry: existingHashMediaEntriesByHash[media.entry?.hash || media.meta?.hash],
		}))
		.concat(selfDuplicateMedias);

	return { uniqueHashMedias: selfUniqueHashMedias, existingHashMedias };
}

async function extractSource(baseSource, { existingExtractMediaByUrl }) {
	if (typeof baseSource.defer === 'function') {
		const src = await baseSource.defer();

		return {
			...baseSource,
			...toBaseSource(src),
		};
	}

	if (typeof baseSource.extract !== 'function' || !baseSource.url) {
		return baseSource;
	}

	const existingExtractMedia = existingExtractMediaByUrl[baseSource.url];

	if (existingExtractMedia) {
		// media entry found by extract URL
		return {
			...baseSource,
			entry: existingExtractMedia,
		};
	}

	const res = await get(baseSource.url);

	if (res.ok) {
		const src = await baseSource.extract(res.item);

		return {
			...baseSource,
			...toBaseSource(src),
		};
	}

	throw new Error(`Could not extract source from ${baseSource.url}: ${res.status}`);
}

async function storeS3Object(filepath, media) {
	const fullFilepath = path.join(config.media.path, filepath);
	const file = fs.createReadStream(fullFilepath);

	const status = await s3.upload({
		Bucket: config.s3.bucket,
		Body: file,
		Key: filepath,
		ContentType: media.meta.mimetype,
	}).promise();

	await fsPromises.unlink(fullFilepath);

	logger.silly(`Uploaded '${media.id}' from ${media.src} to S3 bucket '${status.Bucket}' at ${status.Location}`);

	return status;
}

async function writeImage(image, media, info, filepath, isProcessed) {
	if (isProcessed && info.pages) {
		// convert animated image to WebP and write to permanent location
		await image
			.webp()
			.toFile(path.join(config.media.path, filepath));

		return;
	}

	await image
		.resize({
			height: config.media.maxSize,
			withoutEnlargement: true,
		})
		.jpeg({ quality: config.media.quality })
		.toFile(path.join(config.media.path, filepath));
}

async function writeThumbnail(image, thumbpath) {
	return image
		.jpeg({ quality: config.media.thumbnailQuality })
		.resize({
			height: config.media.thumbnailSize,
			withoutEnlargement: true,
		})
		.rotate()
		.toFile(path.join(config.media.path, thumbpath));
}

async function writeLazy(image, lazypath) {
	return image
		.resize({
			height: config.media.lazySize,
			withoutEnlargement: true,
		})
		.jpeg({ quality: config.media.lazyQuality })
		.rotate()
		.toFile(path.join(config.media.path, lazypath));
}

async function storeImageFile(media, hashDir, hashSubDir, filename, filedir, filepath, options) {
	logger.silly(`Storing permanent media files for ${media.id} from ${media.src} at ${filepath}`);
	logger.debug(`Memory usage at image storage: ${process.memoryUsage.rss() / 1000000} MB (${media.src})`);

	try {
		const thumbdir = config.s3.enabled ? path.join(media.role, 'thumbs') : path.join(media.role, 'thumbs', hashDir, hashSubDir);
		const thumbpath = path.join(thumbdir, filename);

		const lazydir = config.s3.enabled ? path.join(media.role, 'lazy') : path.join(media.role, 'lazy', hashDir, hashSubDir);
		const lazypath = path.join(lazydir, filename);

		await Promise.all([
			fsPromises.mkdir(path.join(config.media.path, filedir), { recursive: true }),
			fsPromises.mkdir(path.join(config.media.path, thumbdir), { recursive: true }),
			fsPromises.mkdir(path.join(config.media.path, lazydir), { recursive: true }),
		]);

		const image = sharp(media.file.path, { pages: ['trailer', 'teaser'].includes(media.role) ? -1 : 1 }); // don't store posters as animation
		const isProcessed = media.meta.subtype !== 'jpeg' || media.process;

		const [info, stats] = await Promise.all([
			image.metadata(),
			options?.stats && image.stats(),
		]);

		if (media.process) {
			Object.entries(media.process).forEach(([operation, processOptions]) => {
				if (image[operation]) {
					image[operation](...(Array.isArray(processOptions) ? processOptions : [processOptions]));
					return;
				}

				if (operation === 'crop') {
					image.extract(...(Array.isArray(processOptions) ? processOptions : [processOptions]));
					return;
				}

				logger.warn(`Unknown image operation on ${media.id} (${media.src}): ${operation}`);
			});
		}

		await writeImage(image, media, info, filepath, isProcessed);

		await Promise.all([
			writeThumbnail(image, thumbpath, info),
			writeLazy(image, lazypath, info),
		]);

		/*
		if (isProcessed) {
			// file already stored, remove temporary file
			await fsPromises.unlink(media.file.path);
		} else {
			// image not processed, simply move temporary file to final location
			await fsPromises.rename(media.file.path, path.join(config.media.path, filepath));
		}
		*/

		await fsPromises.unlink(media.file.path);

		if (config.s3.enabled) {
			await Promise.all([
				storeS3Object(filepath, media),
				storeS3Object(thumbpath, media),
				storeS3Object(lazypath, media),
			]);
		}

		logger.silly(`Stored thumbnail, lazy and permanent media file for ${media.id} from ${media.src} at ${filepath}`);

		return {
			...media,
			file: {
				path: filepath,
				thumbnail: thumbpath,
				lazy: lazypath,
			},
			meta: {
				...media.meta,
				// 6 or 8 implies image is sideways, and size is not inherently adjusted for orientation
				width: info.orientation === 6 || info.orientation === 8 ? info.height : info.width,
				height: info.orientation === 6 || info.orientation === 8 ? info.width : info.height,
				entropy: stats?.entropy || null,
				sharpness: stats?.sharpness || null,
			},
		};
	} catch (error) {
		logger.error(`Failed to store ${media.id} from ${media.src} at ${filepath}: ${error.message}`);

		await fsPromises.unlink(media.file.path);

		return null;
	}
}

async function storeFile(media, options) {
	try {
		const hashDir = media.meta.hash.slice(0, 2);
		const hashSubDir = media.meta.hash.slice(2, 4);
		const hashFilename = config.s3.enabled ? media.meta.hash : media.meta.hash.slice(4);

		const filename = media.quality
			? `${hashFilename}_${media.quality}.${media.meta.extension}`
			: `${hashFilename}.${media.meta.extension}`;

		const filedir = config.s3.enabled ? media.role : path.join(media.role, hashDir, hashSubDir);
		const filepath = path.join(filedir, filename);

		if (argv.forceMedia) {
			try {
				// remove old file to in case rename() does not overwrite (possibly on NFS setups)
				await fsPromises.unlink(path.join(config.media.path, filepath));
			} catch (error) {
				// file probably didn't exist
			}
		}

		if (media.meta.type === 'image') {
			return storeImageFile(media, hashDir, hashSubDir, filename, filedir, filepath, options);
		}

		if (['posters', 'photos', 'caps', 'covers'].includes(media.role)) {
			throw new Error(`Media for '${media.role}' must be an image, but '${media.meta.mimetype}' was detected`);
		}

		if (['teasers', 'trailers'].includes(media.role) && media.meta.type !== 'video') {
			throw new Error(`Media for '${media.role}' must be a video, but '${media.meta.mimetype}' was detected in ${media.src}`);
		}

		const [stat] = await Promise.all([
			fsPromises.stat(media.file.path),
			fsPromises.mkdir(path.join(config.media.path, filedir), { recursive: true }),
		]);

		// move temp file to permanent location
		await fsPromises.rename(media.file.path, path.join(config.media.path, filepath));

		if (config.s3.enabled) {
			// upload the file to S3 storage, will remove original
			await storeS3Object(filepath, media);
		}

		logger.silly(`Stored permanent media file for ${media.id} from ${media.src} at ${filepath}`);

		return {
			...media,
			file: {
				path: filepath,
			},
			meta: {
				...media.meta,
				size: stat.size,
			},
		};
	} catch (error) {
		logger.warn(`Failed to store ${media.src}: ${error.message}`);

		try {
			await fsPromises.unlink(media.file.path);
		} catch (unlinkError) {
			logger.warn(`Failed to unlink ${media.file.path} from ${media.src}: ${unlinkError.message}`);
		}

		return null;
	}
}

async function fetchHttpSource(source, tempFileTarget, hashStream) {
	const res = await http.get(source.src, {
		headers: {
			...(source.referer && { referer: source.referer }),
			...(source.host && { host: source.host }),
		},
		stream: true, // sources are fetched in parallel, don't gobble up memory
		transforms: [hashStream],
		destination: tempFileTarget,
		...(source.interval && { interval: source.interval }),
		...(source.concurrency && { concurrency: source.concurrency }),
	});

	if (!res.ok) {
		throw new Error(`Response ${res.status} not OK`);
	}

	return {
		mimetype: (source.expectType
			? source.expectType[res.headers['content-type']]
			: res.headers['content-type'])
			|| mime.getType(new URL(source.src).pathname),
	};
}

streamQueue.define('fetchStreamSource', async ({ source, tempFileTarget, hashStream }) => {
	const meta = { mimetype: 'video/mp4' };

	const video = ffmpeg(source.stream)
		.format('mp4')
		.outputOptions(['-movflags frag_keyframe+empty_moov'])
		.on('start', (cmd) => logger.verbose(`Fetching stream from ${source.stream} with "${cmd}"`))
		.on('error', (error) => logger.error(`Failed to fetch stream from ${source.stream}: ${error.message}`))
		.pipe();

	// await pipeline(video, hashStream, tempFileTarget);
	await stream.promises.pipeline(video, hashStream, tempFileTarget);

	logger.verbose(`Finished fetching stream from ${source.stream}`);

	return meta;
}, {
	concurrency: config.media.streamConcurrency,
});

async function fetchSource(source, baseMedia) {
	const maxAttempts = source.attempts || argv.mediaAttempts;

	logger.silly(`Fetching media from ${source.src}`);
	logger.debug(`Memory usage before media fetch: ${process.memoryUsage.rss() / 1000000} MB (${source.src})`);

	if (source.stream && !config.media.fetchStreams) {
		throw new Error(`Stream fetching disabled, ignoring ${source.stream}`);
	}

	async function attempt(attempts = 1) {
		const hasher = new blake2.Hash('blake2b', { digestLength: 24 });
		let hasherReady = true;
		hasher.setEncoding('hex');

		try {
			const tempFilePath = path.join(config.media.path, 'temp', `${baseMedia.id}`);
			const tempFileTarget = fs.createWriteStream(tempFilePath);
			const hashStream = new stream.PassThrough();
			let size = 0;

			hashStream.on('data', (streamChunk) => {
				size += streamChunk.length;

				if (hasherReady) {
					hasher.write(streamChunk);
				}
			});

			const { mimetype } = source.stream
				? await streamQueue.push('fetchStreamSource', { source, tempFileTarget, hashStream })
				: await fetchHttpSource(source, tempFileTarget, hashStream);

			hasher.end();

			const hash = hasher.read();
			const [type, subtype] = mimetype.split('/');
			const extension = mime.getExtension(mimetype);

			if (source.verifyType && source.verifyType !== type) {
				throw Object.assign(new Error(`Type '${type}' does not match type '${source.verifyType}' specified by source`), { code: 'VERIFY_TYPE' });
			}

			return {
				...source,
				file: {
					path: tempFilePath,
				},
				meta: {
					hash,
					mimetype,
					extension,
					type,
					subtype,
					size,
				},
			};
		} catch (error) {
			hasherReady = false;
			hasher.end();

			if (error.code !== 'VERIFY_TYPE') {
				logger.warn(`Failed attempt ${attempts}/${maxAttempts} to fetch ${source.src}: ${error.message}`);

				if (attempts < maxAttempts) {
					await Promise.delay(1000);

					return attempt(attempts + 1);
				}
			}

			throw new Error(`Failed to fetch ${source.src}: ${error.message}`);
		}
	}

	return attempt(1);
}

async function trySource(baseSource, existingMedias, baseMedia) {
	// catch error and try the next source
	const extractedSource = await extractSource(baseSource, existingMedias);
	const existingSourceMedia = existingMedias.existingSourceMediaByUrl[extractedSource.src];

	if (!argv.forceMedia && extractedSource.entry) {
		logger.silly(`Media page URL already in database, not extracting ${baseSource.url}`);

		// media entry found during extraction, don't fetch
		return extractedSource;
	}

	if (!argv.forceMedia && existingSourceMedia) {
		logger.silly(`Media source URL already in database, skipping ${baseSource.src}`);

		// media entry found by source URL, don't fetch
		return {
			...baseSource,
			entry: existingSourceMedia,
		};
	}

	const source = await fetchSource(extractedSource, baseMedia);

	return {
		...source,
		entry: extractedSource.entry || existingSourceMedia,
	};
}

async function fetchMedia(baseMedia, existingMedias) {
	try {
		const source = await baseMedia.sources.reduce(
			// try each source until success
			(result, baseSource, baseSourceIndex) => result.catch(async (error) => {
				if (error.message) {
					logger.warn(error.message);
				}

				return trySource(baseSource, existingMedias, baseMedia, baseSourceIndex);
			}),
			Promise.reject(new Error()),
		);

		return {
			...baseMedia,
			...source,
		};
	} catch (error) {
		logger.warn(error.message);

		return baseMedia;
	}
}

function curateMediaEntry(media, index) {
	if (media.entry) {
		return media;
	}

	const curatedMediaEntry = {
		id: media.id,
		path: media.file.path,
		thumbnail: media.file.thumbnail,
		lazy: media.file.lazy,
		is_s3: config.s3.enabled,
		index,
		mime: media.meta.mimetype,
		hash: media.meta.hash,
		size: media.meta.size,
		width: media.meta.width,
		height: media.meta.height,
		is_vr: media.vr,
		entropy: media.meta.entropy,
		sharpness: media.meta.sharpness,
		source: media.src,
		source_page: media.url,
		scraper: media.scraper,
		credit: media.credit,
		comment: media.comment,
	};

	return {
		...media,
		newEntry: true,
		entry: curatedMediaEntry,
	};
}

async function storeMedias(baseMedias, options) {
	await fsPromises.mkdir(path.join(config.media.path, 'temp'), { recursive: true });

	const { existingSourceMediaByUrl, existingExtractMediaByUrl } = await findSourceDuplicates(baseMedias);

	const fetchedMedias = await Promise.map(
		baseMedias,
		async (baseMedia) => fetchMedia(baseMedia, { existingSourceMediaByUrl, existingExtractMediaByUrl }),
		// { concurrency: 100 }, // don't overload disk (or network, although this has its own throttling)
		{ concurrency: 10 }, // don't overload disk (or network, although this has its own throttling)
	);

	const { uniqueHashMedias, existingHashMedias } = await findHashDuplicates(fetchedMedias);

	const savedMedias = await Promise.map(
		uniqueHashMedias,
		async (baseMedia) => storeFile(baseMedia, options),
		{ concurrency: 100 }, // don't overload disk
	);

	if (argv.forceMedia) {
		// overwrite files in case image processing was changed
		await Promise.map(
			existingHashMedias,
			async (baseMedia) => storeFile(baseMedia, options),
			{ concurrency: 100 }, // don't overload disk
		);
	}

	const newMediaWithEntries = savedMedias.filter(Boolean).map((media, index) => curateMediaEntry(media, index));
	const newMediaEntries = newMediaWithEntries.filter((media) => media.newEntry).map((media) => media.entry);

	try {
		await bulkInsert('media', newMediaEntries, false);

		return [...newMediaWithEntries, ...existingHashMedias];
	} catch (error) {
		throw Object.assign(error, { entries: newMediaEntries });
	}
}

async function associateReleaseMedia(releases, type = 'release') {
	if (!argv.media) {
		return;
	}

	const baseMediasByReleaseId = releases.reduce((acc, release) => ({
		...acc,
		[release.id]: [
			...(argv.images && argv.poster ? toBaseMedias([release.poster], 'posters') : []),
			...(argv.images && argv.covers ? toBaseMedias(release.covers, 'covers') : []),
			...(argv.images && argv.photos ? toBaseMedias(release.photos, 'photos') : []),
			...(argv.images && argv.caps ? toBaseMedias(release.caps, 'caps') : []),
			...(argv.videos && argv.trailer ? toBaseMedias([release.trailer], 'trailers') : []),
			...(argv.videos && argv.teaser ? toBaseMedias([release.teaser], 'teasers') : []),
		],
	}), {});

	const baseMediasByRole = Object.values(baseMediasByReleaseId)
		.flat()
		.filter(Boolean)
		.reduce((acc, baseMedia) => {
			if (!acc[baseMedia.role]) acc[baseMedia.role] = [];
			acc[baseMedia.role].push(baseMedia);

			return acc;
		}, {});

	await Promise.reduce(['posters', 'covers', 'photos', 'caps', 'teasers', 'trailers'], async (chain, role) => {
		// stage by role so posters are prioritized over photos and videos
		await chain;

		const baseMedias = baseMediasByRole[role];

		if (!baseMedias) {
			return;
		}

		try {
			const storedMedias = await storeMedias(baseMedias);
			const storedMediasById = itemsByKey(storedMedias, 'id');

			const associations = Object
				.entries(baseMediasByReleaseId)
				.reduce((acc, [releaseId, releaseBaseMedias]) => {
					releaseBaseMedias.forEach((baseMedia) => {
						const media = storedMediasById[baseMedia.id];
						const mediaId = (storedMediasById[media?.use] && media?.use) || media?.entry?.id;

						if (mediaId) {
							acc.push({
								[`${type}_id`]: releaseId,
								media_id: mediaId,
							});
						}
					});

					return acc;
				}, [])
				.filter(Boolean);

			if (associations.length > 0) {
				await bulkInsert(`${type}s_${role}`, associations, false);
			}
		} catch (error) {
			if (error.entries) {
				logger.error(util.inspect(error.entries, null, null, { color: true }));
			}

			logger.error(`Failed to store ${type} ${role}: ${error.message} (${error.detail || 'no detail'})`);
		}
	}, Promise.resolve());
}

async function associateAvatars(profiles) {
	if (!argv.media) {
		return profiles;
	}

	const profilesWithBaseMedias = profiles.map((profile) => (profile.avatar
		? {
			...profile,
			avatarBaseMedia: toBaseMedias([profile.avatar], 'avatars', {
				credit: profile.credit || profile.entity?.name || null,
				scraper: profile.scraper || null,
			})[0],
		}
		: profile
	));

	const baseMedias = profilesWithBaseMedias.map((profile) => profile.avatarBaseMedia).filter(Boolean);

	const storedMedias = await storeMedias(baseMedias, { stats: true });
	const storedMediasById = itemsByKey(storedMedias, 'id');

	const profilesWithAvatarIds = profilesWithBaseMedias.map((profile) => {
		const media = storedMediasById[profile.avatarBaseMedia?.id];

		if (media) {
			return {
				...profile,
				avatarMediaId: media.use || media.entry.id,
			};
		}

		return profile;
	});

	return profilesWithAvatarIds;
}

async function deleteS3Objects(media) {
	const objects = media
		.map((item) => [
			{ Key: item.path },
			{ Key: item.thumbnail },
			{ Key: item.lazy },
		])
		.flat()
		.filter((item) => item.Key);

	const status = await s3.deleteObjects({
		Bucket: config.s3.bucket,
		Delete: {
			Objects: objects,
			Quiet: false,
		},
	}).promise();

	logger.info(`Removed ${status.Deleted.length} media files from S3 bucket '${config.s3.bucket}', ${status.Errors.length} errors`);

	return status;
}

async function flushOrphanedMedia() {
	const orphanedMedia = await knex('media')
		.where('is_sfw', false)
		.whereNotExists(
			knex
				.from(
					knex('tags_posters')
						.select('media_id')
						.unionAll(
							knex('tags_photos').select('media_id'),
							knex('releases_posters').select('media_id'),
							knex('releases_photos').select('media_id'),
							knex('releases_caps').select('media_id'),
							knex('releases_covers').select('media_id'),
							knex('releases_trailers').select('media_id'),
							knex('releases_teasers').select('media_id'),
							knex('movies_covers').select('media_id'),
							knex('movies_trailers').select('media_id'),
							knex('actors').select(knex.raw('avatar_media_id as media_id')),
							knex('actors_profiles').select(knex.raw('avatar_media_id as media_id')),
							knex('actors_photos').select('media_id'),
							knex('chapters_photos').select('media_id'),
							knex('chapters_posters').select('media_id'),
						)
						.as('associations'),
				)
				.whereRaw('associations.media_id = media.id'),
		)
		.returning(['media.id', 'media.is_s3', 'media.path', 'media.thumbnail', 'media.lazy'])
		.delete();

	if (argv.flushMediaFiles) {
		await Promise.all(orphanedMedia.filter((media) => !media.is_s3).map((media) => Promise.all([
			media.path && fsPromises.unlink(path.join(config.media.path, media.path)).catch(() => { /* probably file not found */ }),
			media.thumbnail && fsPromises.unlink(path.join(config.media.path, media.thumbnail)).catch(() => { /* probably file not found */ }),
			media.lazy && fsPromises.unlink(path.join(config.media.path, media.lazy)).catch(() => { /* probably file not found */ }),
		])));

		if (config.s3.enabled) {
			await deleteS3Objects(orphanedMedia.filter((media) => media.is_s3));
		}

		logger.info(`Removed ${orphanedMedia.length} media files from database and storage`);
	} else {
		logger.info(`Removed ${orphanedMedia.length} media files from database, but not from storage`);
	}

	try {
		await fsPromises.rm(path.join(config.media.path, 'temp'), { recursive: true });
		logger.info('Cleared temporary media directory');
	} catch (error) {
		logger.warn(`Failed to clear temporary media directory: ${error.message}`);
	}
}

module.exports = {
	associateAvatars,
	associateReleaseMedia,
	flushOrphanedMedia,
};