Greasy Fork

Greasy Fork is available in English.

[RED] Similar CD Detector

Simple script for testing CD releases for duplicity

当前为 2024-09-03 提交的版本,查看 最新版本

您需要先安装一款用户脚本管理器扩展,例如 Tampermonkey 篡改猴Greasemonkey 油猴子Violentmonkey 暴力猴,才能安装此脚本。

您需要先安装一款用户脚本管理器扩展,例如 Tampermonkey 篡改猴,才能安装此脚本。

您需要先安装一款用户脚本管理器扩展,例如 Tampermonkey 篡改猴Violentmonkey 暴力猴,才能安装此脚本。

您需要先安装一款用户脚本管理器扩展,例如 Tampermonkey 篡改猴Userscripts ,才能安装此脚本。

您需要先安装一款用户脚本管理器扩展,例如 Tampermonkey 篡改猴,才能安装此脚本。

您需要先安装一款用户脚本管理器扩展后才能安装此脚本。

(我已经安装了用户脚本管理器,让我安装!)

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

(我已经安装了用户样式管理器,让我安装!)

// ==UserScript==
// @name         [RED] Similar CD Detector
// @namespace    http://greasyfork.icu/users/321857-anakunda
// @version      1.11.1
// @description  Simple script for testing CD releases for duplicity
// @match        https://redacted.ch/torrents.php?id=*
// @match        https://redacted.ch/torrents.php?page=*&id=*
// @match        https://redacted.ch/upload.php?groupid=*
// @run-at       document-end
// @author       Anakunda
// @license      GPL-3.0-or-later
// @grant        GM_xmlhttpRequest
// @grant        GM_registerMenuCommand
// @connect      musicbrainz.org
// @connect      db.cue.tools
// @require      https://openuserjs.org/src/libs/Anakunda/Requests.min.js
// @require      https://openuserjs.org/src/libs/Anakunda/libLocks.min.js
// @require      https://openuserjs.org/src/libs/Anakunda/gazelleApiLib.min.js
// ==/UserScript==

'use strict';

function getTorrentId(tr) {
	if (!(tr instanceof HTMLElement)) throw 'Invalid argument';
	if ((tr = tr.querySelector('a.button_pl')) != null
			&& (tr = parseInt(new URLSearchParams(tr.search).get('torrentid'))) > 0) return tr;
	throw 'Failed to get torrent id';
}

const toASCII = str => str && str.normalize('NFKD').replace(/[\x00-\x1F\u0300-\u036F]/gu, '');
const cmpNorm = str => str && toASCII(str).replace(/\s+(?:and|et|y|und|и)\s+/gi, ' & ').toLowerCase()
	.replace(/[\s\‐\−\—\–\x00-\x25\x27-\x2F\x3A-\x40\x5B-\x5E\x60\x7B-\x7F\u2019]+/g, '');
const dupePrecheckInLinkbox = false; // set to true to have own rip dupe precheck in group page linkbox
const maxRemarks = 60, allowReports = true;
const sessionsCache = new Map, getTorrentIds = (...trs) => trs.map(getTorrentId);
let selected = null, sessionsSessionCache;
// const rxStackedLogReducer = /^[\S\s]*(?:\r?\n)+(?=(?:Exact Audio Copy V|X Lossless Decoder version\s+|CUERipper v|EZ CD Audio Converter\s+)\d+\b)/;
// const stackedLogReducer = logFile => rxStackedLogReducer.test(logFile) ?
// 	logFile.replace(rxStackedLogReducer, '') : logFile;
const msf = 75, preGap = 2 * msf, msfTime = /(?:(-?\d+):)?(-?\d+):(-?\d+)[\.\:](-?\d+)/.source;
const msfToSector = time => Array.isArray(time) || (time = new RegExp('^\\s*' + msfTime + '\\s*$').exec(time)) != null ?
	(((time[1] ? parseInt(time[1]) : 0) * 60 + parseInt(time[2])) * 60 + parseInt(time[3])) * msf + parseInt(time[4]) : NaN;
const rxRangeRip = /^(?:Selected range|Выбранный диапазон|Âûáðàííûé äèàïàçîí|已选择范围|選択された範囲|Gewählter Bereich|Intervallo selezionato|Geselecteerd bereik|Utvalt område|Seleccionar gama|Избран диапазон|Wybrany zakres|Izabrani opseg|Vybraný rozsah|Limites Seleccionados)(?:[^\S\r\n]+\((?:Sectors|Секторы|扇区|Sektoren|Settori|Sektorer|Sectores|Сектори|Sektora|Sektory)[^\S\r\n]+(\d+)[^\S\r\n]*-[^\S\r\n]*(\d+)\))?$/m;
const sessionHeader = '(?:' + [
	'(?:EAC|XLD) (?:extraction logfile from |Auslese-Logdatei vom |extraheringsloggfil från |uitlezen log bestand van |log súbor extrakcie z |抓取日志文件从)',
	'File di log (?:EAC|XLD) per l\'estrazione del ', 'Archivo Log de extracciones desde ',
	'Отчёт (?:EAC|XLD) об извлечении, выполненном ', 'Отчет на (?:EAC|XLD) за извличане, извършено на ',
	'Protokol extrakce (?:EAC|XLD) z ', 'Sprawozdanie ze zgrywania programem (?:EAC|XLD) z ',
	'(?:EAC|XLD)-ov fajl dnevnika ekstrakcije iz ',
	'(?:Log created by: whipper|EZ CD Audio Converter) .+(?:\\r?\\n)+Log creation date: ',
	'morituri extraction logfile from ', 'Rip .+ Audio Extraction Log',
].join('|') + ')';
const rxTrackExtractor = /^(?:(?:(?:Track|Трек|Òðåê|音轨|Traccia|Spår|Pista|Трак|Utwór|Stopa)[^\S\r\n]+\d+\b.*|Track \d+ saved to\b.+)$(?:\r?\n^(?:[^\S\r\n]+.*)?$)*| +\d+:$\r?\n^ {4,}Filename:.+$(?:\r?\n^(?: {4,}.*)?$)*)/gm;
const exportTocEntry = tocEntry => Object.defineProperty(tocEntry, 'length',
	{ get: function() { return this.endSector + 1 - this.startSector } });

function getTocEntries(session) {
	if (!session) return null;
	const tocParsers = [
		'^\\s+' + ['\\d+', msfTime, msfTime, '-?\\d+', '-?\\d+'] // EAC / XLD
			.map(pattern => '(' + pattern + ')').join('\\s+\\|\\s+') + '\\s*$',
		'^\\s+\[X\]\\s+' + ['\\d+', msfTime, msfTime, '-?\\d+', '-?\\d+'] // EZ CD
			.map(pattern => '(' + pattern + ')').join('\\s+') + '\\b',
		// whipper
		'^ +(\\d+): *' + [['Start', msfTime], ['Length', msfTime], ['Start sector', '-?\\d+'], ['End sector', '-?\\d+']]
			.map(([label, capture]) => `\\r?\\n {4,}${label}: *(${capture})\\b *`).join(''),
		// Rip
		'^\\s+' + ['(\\d+)', '(' + msfTime + ')', '(?:(?:-?\\d+):)?-?\\d+:-?\\d+[\\.\\:]-?\\d+', '(' + msfTime + ')', '(-?\\d+)', '(-?\\d+)', '\\d+']
			.join('\\s+\\|\\s+') + '\\s*$',
	];
	let tocEntries = tocParsers.reduce((m, rx) => m || session.match(new RegExp(rx, 'gm')), null);
	if (tocEntries == null || (tocEntries = tocEntries.map(function(tocEntry, trackIndex) {
		if ((tocEntry = tocParsers.reduce((m, rx) => m || new RegExp(rx).exec(tocEntry), null)) == null)
			throw `assertion failed: track ${trackIndex + 1} ToC entry invalid format`;
		const [startSector, endSector] = [12, 13].map(index => parseInt(tocEntry[index]));
		console.assert(msfToSector(tocEntry[2]) == startSector && msfToSector(tocEntry[7]) == endSector + 1 - startSector
			&& endSector >= startSector, 'TOC table entry validation failed:', tocEntry);
		return exportTocEntry({ trackNumber: parseInt(tocEntry[1]), startSector: startSector, endSector: endSector });
	})).length <= 0) return null;
	if (!tocEntries.every((tocEntry, trackIndex) => tocEntry.trackNumber == trackIndex + 1)) {
		tocEntries = Object.assign.apply({ }, tocEntries.map(tocEntry => ({ [tocEntry.trackNumber]: tocEntry })));
		tocEntries = Object.keys(tocEntries).sort((a, b) => parseInt(a) - parseInt(b)).map(key => tocEntries[key]);
	}
	console.assert(tocEntries.every((tocEntry, trackIndex, tocEntries) => tocEntry.trackNumber == trackIndex + 1
		&& tocEntry.endSector >= tocEntry.startSector && (trackIndex <= 0 || tocEntry.startSector > tocEntries[trackIndex - 1].endSector)),
		'TOC table structure validation failed:', tocEntries);
	return tocEntries;
}

function getSessionsFromLogs(logFiles, detectCombinedLogs = true) {
	logFiles = Array.prototype.map.call(logFiles, function(logFile) {
		while (logFile.startsWith('\uFEFF')) logFile = logFile.slice(1);
		return logFile;
	});
	const rxRipperSignatures = '(?:(?:' + [
		'Exact Audio Copy V', 'X Lossless Decoder version ', 'CUERipper v',
		'EZ CD Audio Converter ', 'Log created by: whipper ', 'morituri version ', 'Rip ',
	].join('|') + ')\\d+)';
	if (!detectCombinedLogs) {
		const rxStackedLog = new RegExp('^[\\S\\s]*(?:\\r?\\n)+(?=' + rxRipperSignatures + ')');
		logFiles = logFiles.map(logFile => rxStackedLog.test(logFile) ? logFile.replace(rxStackedLog, '') : logFile)
			.filter(RegExp.prototype.test.bind(new RegExp('^(?:' + rxRipperSignatures + '|' + sessionHeader + ')')));
		return logFiles.length > 0 ? logFiles : null;
	} else if ((logFiles = logFiles.map(function(logFile) {
		let rxSessionsIndexer = new RegExp('^' + rxRipperSignatures, 'gm'), indexes = [ ], match;
		while ((match = rxSessionsIndexer.exec(logFile)) != null) indexes.push(match.index);
		if (indexes.length <= 0) {
			rxSessionsIndexer = new RegExp('^' + sessionHeader, 'gm');
			while ((match = rxSessionsIndexer.exec(logFile)) != null) indexes.push(match.index);
		}
		return (indexes = indexes.map((index, ndx, arr) => logFile.slice(index, arr[ndx + 1])).filter(function(logFile) {
			const rr = rxRangeRip.exec(logFile);
			if (rr == null) return true;
			// Ditch HTOA logs
			const tocEntries = getTocEntries(logFile);
			return tocEntries == null || parseInt(rr[1]) != 0 || parseInt(rr[2]) + 1 != tocEntries[0].startSector;
		})).length > 0 ? indexes : null;
	}).filter(Boolean)).length <= 0) return null;
	const sessions = new Map;
	for (const logFile of logFiles) for (const session of logFile) {
		let uniqueKey = getTocEntries(session), title;
		if (uniqueKey != null) uniqueKey = [uniqueKey[0].startSector].concat(uniqueKey.map(tocEntry =>
			tocEntry.endSector + 1)).map(offset => offset.toString(32).padStart(4, '0')).join(''); else continue;
		if ((title = new RegExp('^' + sessionHeader + '(.+)$(?:\\r?\\n)+^(.+ [\\/\\-] .+)$', 'm').exec(session)) != null)
			title = title[2];
		else if ((title = /^ +Release: *$\r?\n^ +Artist: *(.+)$\r?\n^ +Title: *(.+)$/m.exec(session)) != null)
			title = title[1] + ' / ' + title[2]; // Whipper?
		else if ((title = /^Compact Disc Information\r?\n=+\r?\nName: *(.+)$/m.exec(session)) != null)
			title = title[1]; // Rip
		if (title != null) uniqueKey += '/' + cmpNorm(title);
		sessions.set(uniqueKey, session);
	}
	//console.info('Unique keys:', Array.from(sessions.keys()));
	return sessions.size > 0 ? Array.from(sessions.values()) : null;
}

function getSessionsFromTorrent(torrentId, detectCombinedLogs = true) {
	if (Array.isArray(torrentId) && torrentId.every(e => typeof e == 'string')) return Promise.resolve(torrentId);
	else if (typeof torrentId == 'string' && torrentId > 0) torrentId = parseInt(torrentId);
	if (!(torrentId > 0)) throw 'Invalid argument';
	if (sessionsCache.has(torrentId)) return sessionsCache.get(torrentId);
	if (!sessionsSessionCache && 'ripSessionsCache' in sessionStorage) try {
		sessionsSessionCache = JSON.parse(sessionStorage.getItem('ripSessionsCache'));
	} catch(e) {
		console.warn(e);
		sessionStorage.removeItem('ripSessionsCache');
		sessionsSessionCache = undefined;
	}
	if (sessionsSessionCache && torrentId in sessionsSessionCache)
		return Promise.resolve(sessionsSessionCache[torrentId]);
	// let request = queryAjaxAPICached('torrent', { id: torrentId }).then(({torrent}) => torrent.logCount > 0 ?
	// 		Promise.all(torrent.ripLogIds.map(ripLogId => queryAjaxAPICached('riplog', { id: torrentId, logid: ripLogId })
	// 			.then(response => response))) : Promise.reject('No logfiles attached'));
	let request = LocalXHR.get('/torrents.php?' + new URLSearchParams({ action: 'loglist', torrentid: torrentId }));
	request = request.then(({response}) => Array.from(response.body.querySelectorAll(':scope > blockquote > pre:first-child'),
		pre => pre.textContent));
	request = request.then(logFiles => getSessionsFromLogs(logFiles, detectCombinedLogs)).then(function(sessions) {
		if (sessions == null) return Promise.reject('No valid logfiles attached'); else try {
			if (!sessionsSessionCache) sessionsSessionCache = { };
			sessionsSessionCache[torrentId] = sessions;
			sessionStorage.setItem('ripSessionsCache', JSON.stringify(sessionsSessionCache));
		} catch(e) { console.warn(e) }
		return sessions;
	});
	sessionsCache.set(torrentId, request);
	return request;
}

function releaseFingerprintFromSessions(sessions) {
	if (!Array.isArray(sessions)) throw 'Invalid argument';
	return Object.freeze(sessions.map(function(session) {
		const mediumFingerprint = getTocEntries(session);
		if (!mediumFingerprint) return null;
		mediumFingerprint.timeStamp = new RegExp(`^${sessionHeader}(.+)$`, 'm').exec(session);
		mediumFingerprint.source = 'session';
		mediumFingerprint.isRangeRip = rxRangeRip.test(session);
		mediumFingerprint.layoutType = (function(tocEntries) {
			for (let index = 0; index < tocEntries.length - 1; ++index) {
				const gap = tocEntries[index + 1].startSector - tocEntries[index].endSector - 1;
				if (gap != 0) return (gap == 11400 ? tocEntries.length - index : 0) - 1;
			}
			return 0;
		})(mediumFingerprint);
		const trackRecords = session.match(rxTrackExtractor);
		console.assert((trackRecords == null) == mediumFingerprint.isRangeRip, session);
		console.assert(trackRecords == null || trackRecords.length == mediumFingerprint.length - mediumFingerprint.layoutType, session);
		mediumFingerprint.trackRecords = trackRecords == null ? 0 : trackRecords.length;
		if (trackRecords != null) mediumFingerprint.forEach(function(tocEntry, index) {
			function extractValue(parsers) {
				const matches = Object.keys(parsers).map(pattern =>
					new RegExp(`^[^\\S\\r\\n]+${pattern}\\s*$`, 'm').exec(trackRecords[index]));
				const ndx = matches.findIndex(Boolean);
				if (ndx < 0) return;
				if (typeof Object.values(parsers)[ndx] != 'function') throw 'Invalid parser function';
				return Object.values(parsers)[ndx](matches[ndx]);
			}

			tocEntry.preGap = extractValue({
				['(?:Pre-gap length|Длина предзазора|Äëèíà ïðåäçàçîðà|前间隙长度|Pausenlänge|Durata Pre-Gap|För-gap längd|Longitud Pre-gap|Дължина на предпразнина|Długość przerwy|Pre-gap dužina|[Dd]élka mezery|Dĺžka medzery pred stopou|Extensão do pre-gap)\\s+' + msfTime]: msfToSector, // 1270
				['(?:Pre-gap length)\\s*:\\s*' + msfTime]: msfToSector,
			});
			tocEntry.crc32 = extractValue({
				'(?:(?:Copy|复制|Kopie|Copia|Kopiera|Copiar|Копиран) CRC|CRC (?:копии|êîïèè|kopii|kopije|kopie|kópie|de Cópia)|コピーCRC)\\s+([\\da-fA-F]{8})': m => parseInt(m[1], 16), // 1272
				'(?:CRC32 hash|Copy CRC|CRC)\\s*:\\s*([\\da-fA-F]{8})': m => parseInt(m[1], 16),
			});
			tocEntry.peak = extractValue({
				'(?:Peak level|Пиковый уровень|Ïèêîâûé óðîâåíü|峰值电平|ピークレベル|Spitzenpegel|Pauze lengte|Livello di picco|Peak-nivå|Nivel Pico|Пиково ниво|Poziom wysterowania|Vršni nivo|[Šš]pičková úroveň|Nível de Pico)\\s+(\\d+(?:\\.\\d+)?)\\s*\\%': m => [parseFloat(m[1]) * 10, true], // 1217
				'(?:Peak(?: level)?)\\s*:\\s*(\\d+(?:\\.\\d+)?)': m => [parseFloat(m[1]) * 1000, false],
			});
			for (let v = 2; v > 0; --v) tocEntry['arv' + v] = extractValue({
				[`.+?\\[([\\da-fA-F]{8})\\].+\\(AR v${v}\\)`]: m => parseInt(m[1], 16),
				[`(?:AccurateRip v${v} signature)\\s*:\\s*([\\da-fA-F]{8})`]: m => parseInt(m[1], 16),
			});
		});
		return Object.freeze(mediumFingerprint);
	}));
}

// progressive method tries to de-round track peaks expressed in %
function testSimilarity(release1, release2, matchInAnyOrder = true, progressivePeaksComparison = true) {
	function compareMedium(...media) {
		function addTrackRemark(trackIndex, remark) {
			if (!(trackIndex in volRemarks)) volRemarks[trackIndex] = [ ];
			volRemarks[trackIndex].push(remark);
		}

		if (media.length < 2) throw 'Two arguments required';
		const mediumIndexes = [release1.indexOf(media[0]), release2.indexOf(media[1])];
		let volDescriptor = (mediumIndexes[0] + 1).toString();
		if (mediumIndexes[1] != mediumIndexes[0]) volDescriptor += '↔' + (mediumIndexes[1] + 1);
		const remarks = [ ], volRemarks = [ ];
		if (media.some(medium => medium == null)) throw `disc ${volDescriptor} ToC is missing for at least one medium`;
		let mediumLength = media.map(function(medium, mediumIndex) {
			let mediumLength = medium.length;
			if (medium.layoutType < 0) remarks.push(`Disc ${mediumIndex + 1} having unknown layout type`);
			else if (medium.layoutType > 0) mediumLength -= medium.layoutType;
			return mediumLength;
		});
		if (mediumLength[0] == mediumLength[1]) mediumLength = Math.min(...mediumLength);
			else throw `disc ${volDescriptor} ToC lengths mismatch`;
		const tracksMapper = mapFn => Array.from(Array(mediumLength), (_, index) => mapFn(index));
		const htoaCount = media.filter(medium => medium[0].startSector > 150).length;
		if (htoaCount > 0) remarks.push(`Disc ${volDescriptor} ${htoaCount < 2 ? 'one rip' : 'both rips'} possibly containing leading hidden track (ToC starting at non-zero offset)`);
		// Compare TOCs
		const tocThresholds = [
			{ maxShift: 50, maxDrift: 10 }, // WiKi standard
			// { maxShift: 40, maxDrift: 40 }, // staff standard
		], maxPeakDelta = 0.001;
		const tocShifts = tracksMapper(trackIndex =>
			(media[1][trackIndex].endSector - media[1][0].startSector) -
			(media[0][trackIndex].endSector - media[0][0].startSector));
		const tocShiftOf = shifts => shifts.length > 0 ? Math.max(...shifts.map(Math.abs)) : 0;
		const tocDriftOf = shifts => shifts.length > 0 ? Math.max(...shifts) - Math.min(...shifts) : 0;
		let shiftsPool = tocShifts.length > 1 ? tocShiftOf(tocShifts.slice(0, -1)) : undefined;
		shiftsPool = tocShifts.find(trackShift => Math.abs(trackShift) == shiftsPool) || 0;
		const hasPostGap = [shiftsPool + 150, shiftsPool - 150].includes(tocShifts[tocShifts.length - 1]); // ??
		shiftsPool = !hasPostGap ? tocShifts : tocShifts.slice(0, -1);
		const tocShift = tocShiftOf(shiftsPool), tocDrift = tocDriftOf(shiftsPool);
		console.assert(tocDrift >= 0);
		const label = `ToC comparison for medium ${volDescriptor}`;
		console.group(label);
		console.table(tracksMapper(function(trackIndex) {
			const tocEntry = mediumIndex => ({
				['start' + (mediumIndex + 1)]: media[mediumIndex][trackIndex].startSector,
				['end' + (mediumIndex + 1)]: media[mediumIndex][trackIndex].endSector,
				['length' + (mediumIndex + 1)]: media[mediumIndex][trackIndex].length,
			});
			return Object.assign({ 'track#': trackIndex + 1 }, tocEntry(0), tocEntry(1), { tocShift: tocShifts[trackIndex] });
		}));
		console.info(`ToC shift = ${tocShift}`);
		console.info(`ToC drift = ${Math.max(...tocShifts)} - ${Math.min(...tocShifts)} = ${Math.max(...tocShifts) - Math.min(...tocShifts)}`);
		console.groupEnd(label);
		if (tocThresholds.length > 0) (function tryIndex(reason, index = 0) {
			if (index < tocThresholds.length) try {
				if (!Object.keys(tocThresholds[index]).every(key => tocThresholds[index][key] > 0)) throw 'Invalid parameter';
				if (tocShift >= tocThresholds[index].maxShift)
					throw `disc ${volDescriptor} ToC shift not below ${tocThresholds[index].maxShift} sectors`;
				if (tocDrift >= tocThresholds[index].maxDrift)
					throw `disc ${volDescriptor} ToC drift not below ${tocThresholds[index].maxDrift} sectors`;
			} catch(reason) { tryIndex(reason, index + 1) } else throw reason || 'unknown reason';
		})();
		if (tocDrift > 0) remarks.push(`Disc ${volDescriptor} shifted ToCs by ${tocShift} sectors with ${tocDrift} sectors drift`);
		else if (tocShift > 0) remarks.push(`Disc ${volDescriptor} shifted ToCs by ${tocShift} sectors`);
		if (hasPostGap) remarks.push(`Disc ${volDescriptor} with post-gap`);
		if (media.some(medium => medium.isRangeRip == false && !(medium.trackRecords > 0)))
			throw `disc ${volDescriptor} no track records could be extracted for at least one rip`;
		else if (media.every(medium => medium.isRangeRip == false) && media[0].trackRecords != media[1].trackRecords)
			throw `disc ${volDescriptor} track records count mismatch (${media[0].trackRecords} <> ${media[1].trackRecords})`;
		tracksMapper(function(trackIndex) { // just informational
			const mismatches = [ ];
			if (media[0][trackIndex].startSector != media[1][trackIndex].startSector) mismatches.push('offsets');
			if (media[0][trackIndex].length != media[1][trackIndex].length) mismatches.push('lengths');
			if (mismatches.length > 0) addTrackRemark(trackIndex, mismatches.join(' and ') + ' mismatch');
		});
		// Compare pre-gaps - just informational
		if (media.every(medium => medium.isRangeRip == false)) tracksMapper(function(trackIndex) {
			if ((media[0][trackIndex].preGap || 0) != (media[1][trackIndex].preGap || 0))
				addTrackRemark(trackIndex, 'pre-gaps mismatch');
		});
		const identicalTracks = new Set;
		if (!media.some(medium => medium.isRangeRip)) tracksMapper(function(trackIndex) {
			if (media.every(medium => medium[trackIndex].crc32 != undefined)
					&& media[0][trackIndex].crc32 == media[1][trackIndex].crc32) identicalTracks.add(trackIndex);
		});
		// Compare peaks
		tracksMapper(function(trackIndex) {
			if (media.some(medium => medium[trackIndex].peak == undefined)) {
				if (media.every(medium => medium.source == 'session' && medium.isRangeRip == false))
					throw `disc ${volDescriptor} track ${trackIndex + 1} one or both peak levels missing (assertion failed)`;
				if (!media.some(medium => medium.source != 'session')) addTrackRemark(trackIndex, 'peak level missing');
				return;
			} else if (identicalTracks.has(trackIndex)) return;
			//const norm = [peak => peak[0], peak => Math.min(peak[1] ? Math.floor(peak[0]) + 0.748 : peak[0], 1000)];
			const norm = (progressivePeaksComparison ? [-0.031, 0.901] : [0]).map(offset =>
				peak => Math.max(Math.min(peak[1] ? Math.floor(peak[0]) + offset : peak[0], 1000)), 0);
			if (norm.every(fn => Math.abs(fn(media[0][trackIndex].peak) - fn(media[1][trackIndex].peak)) >= maxPeakDelta * 1000))
				throw `disc ${volDescriptor} track ${trackIndex + 1} peak difference above ${maxPeakDelta}`;
			if (media[0][trackIndex].peak[1] == media[1][trackIndex].peak[1]
					&& media[0][trackIndex].peak[0] != media[1][trackIndex].peak[0])
				addTrackRemark(trackIndex, 'peak levels mismatch');
		});
		// Compare checksums - just informational
		if (!media.every(medium => medium.isRangeRip)) tracksMapper(function(trackIndex) {
			if (media.some(medium => medium[trackIndex].crc32 == undefined && !medium.isRangeRip))
				addTrackRemark(trackIndex, 'checksum missing');
			if (media.some(medium => medium[trackIndex].crc32 == undefined)) return;
			if (media[0][trackIndex].crc32 != media[1][trackIndex].crc32) addTrackRemark(trackIndex, 'checksums mismatch');
			else if (media.some(medium => medium.source != 'session')) addTrackRemark(trackIndex, 'checksums matched');
		});
		// Compare AR signatures - just informational
		if (!media.every(medium => medium.isRangeRip)) for (let V of [2, 1]) tracksMapper(function(trackIndex) {
			// if (media.some(medium => medium[trackIndex]['arv' + V] == undefined && medium.isRangeRip == false))
			// 	addTrackRemark(trackIndex, `AR v${V} hash missing`);
			if (media.some(medium => medium[trackIndex]['arv' + V] == undefined)) return;
			if (media[0][trackIndex]['arv' + V] != media[1][trackIndex]['arv' + V])
				addTrackRemark(trackIndex, `AR v${V} signatures mismatch`);
		});
		volRemarks.forEach(function(trackRemarks, trackIndex) {
			if (Array.isArray(trackRemarks))
				remarks.push(`Disc ${volDescriptor} track ${trackIndex + 1}: ${trackRemarks.join(', ')}`);
		});
		if (media.every(medium => medium.timeStamp != null) && media[0].timeStamp[0] == media[1].timeStamp[0])
			remarks.push(`Disc ${volDescriptor} ${identicalRip}`);
		return remarks;
	}

	if (![release1, release2].every(Array.isArray)) throw 'invalid media';
	if (release1.length != release2.length) throw 'media count mismatch';
	const identicalRip = 'originates in same ripping session';
	const isIdenticalRip = remarks => remarks.filter(remark =>
		(remark || '').endsWith(identicalRip)).length >= releaseLength;
	const releaseLength = Math.max(release1.length, release2.length);
	if (releaseLength > 1 && matchInAnyOrder) {
		var remarks = [ ];
		const volumesMapping = new Map;
		outerLoop: for (let medium1 of release1) {
			for (let medium2 of release2) if (!volumesMapping.has(medium2)) try {
				Array.prototype.push.apply(remarks, compareMedium(medium1, medium2));
				volumesMapping.set(medium2, medium1);
				continue outerLoop;
			} catch(e) { console.info(e) }
			break;
		}
		if (release2.every(Map.prototype.has.bind(volumesMapping))) return isIdenticalRip(remarks) ? true : remarks;
	}
	remarks = [ ];
	for (let index = 0; index < releaseLength; ++index)
		Array.prototype.push.apply(remarks, compareMedium(release1[index], release2[index]));
	return isIdenticalRip(remarks) ? true : remarks;
}

(typeof unsafeWindow == 'object' ? unsafeWindow : window).similarCDDetector = Object.freeze({
	apiVersion: GM_info.script.version,
	getTocEntries: getTocEntries,
	getUniqueSessions: getSessionsFromLogs, // backward compatibility
	getSessionsFromLogs: getSessionsFromLogs,
	getSessionsFromTorrent: getSessionsFromTorrent,
	releaseFingerprintFromSessions: releaseFingerprintFromSessions,
	testSimilarity: testSimilarity,
});

function getEditionTitle(elem) {
	while (elem != null && !elem.classList.contains('edition')) elem = elem.previousElementSibling;
	if (elem != null && (elem = elem.querySelector('td.edition_info > strong')) != null)
		return elem.textContent.trimRight().replace(/^[\s\-\−]+/, '').replace(/\s*\/\s*CD$/, '');
}

switch (document.location.pathname) {
	case '/torrents.php': {
		function countSimilar(groupId) {
			if (groupId > 0) return queryAjaxAPI('torrentgroup', { id: groupId }).then(function({torrents}) {
				const torrentIds = torrents.filter(torrent => torrent.media == 'CD' && torrent.format == 'FLAC'
					&& torrent.encoding == 'Lossless' && torrent.hasLog).map(torrent => torrent.id);
				const compareWorkers = [ ];
				torrentIds.forEach(function(torrentId1, ndx1) {
					torrentIds.forEach(function(torrentId2, ndx2) {
						if (ndx2 > ndx1) compareWorkers.push(Promise.all([torrentId1, torrentId2].map(torrentId =>
							getSessionsFromTorrent(torrentId).then(releaseFingerprintFromSessions)))
								.then(releases => testSimilarity(...releases)).then(remarks => true, reason => false));
					});
				});
				return Promise.all(compareWorkers).then(results => results.filter(Boolean).length);
			}); else throw 'Invalid argument';
		}
		for (let selector of [
			'table.torrent_table > tbody > tr.group div.group_info > strong > a:last-of-type',
			'table.torrent_table > tbody > tr.torrent div.group_info > strong > a:last-of-type',
			'table.torrent_table > tbody > tr.group div.group_info > a:last-of-type',
			'table.torrent_table > tbody > tr.torrent div.group_info > a:last-of-type',
		]) for (let a of document.body.querySelectorAll(selector)) {
			a.onclick = function altClickHandler(evt) {
				if (!evt.altKey) return true;
				let groupId = new URLSearchParams(evt.currentTarget.search);
				if ((groupId = parseInt(groupId.get('id'))) > 0) countSimilar(groupId).then(count =>
					{ alert(count > 0 ? `Total ${count} CDs potentially duplicates` : 'No similar CDs found') }, alert);
				return false;
			};
			a.title = 'Use Alt + click to count considerable CD dupes in release group';
		}

		const torrents = Array.prototype.filter.call(document.body.querySelectorAll('table#torrent_details > tbody > tr.torrent_row'),
			tr => (tr = tr.querySelector('td > a')) != null && /\b(?:FLAC)\b.+\b(?:Lossless)\b.+\b(?:Log) \(\-?\d+\s*\%\)/.test(tr.textContent));
		if (torrents.length < 1) break;

		if (torrents.length >= 2) {
			for (let tr of torrents) {
				let torrentId = /^torrent(\d+)$/.exec(tr.id);
				if (torrentId == null || !((torrentId = parseInt(torrentId[1])) > 0)) continue;
				const div = document.createElement('DIV');
				div.innerHTML = '<svg height="14" viewBox="0 0 24 24" fill="gray"><path d="M14.0612 4.7156l4.0067-.7788a.9998.9998 0 10-.3819-1.9629l-4.0264.7826a2.1374 2.1374 0 00-3.7068.7205l-4.0466.7865a.9998.9998 0 10.3819 1.9629l4.0221-.7818a2.1412 2.1412 0 003.751-.729zM7.1782 9.5765a.9997.9997 0 00-1.8115 0l-3.2725 7A.9977.9977 0 002 16.9998v.7275a4.2727 4.2727 0 008.5454 0v-.7275a.9977.9977 0 00-.0942-.4233zm-.9057 2.7846l1.7014 3.6387H4.5713zm.0005 7.6387a2.268 2.268 0 01-2.2454-2h4.4902a2.268 2.268 0 01-2.2448 2zM18.6558 7.5765a.9997.9997 0 00-1.8116 0l-3.273 7a.9977.9977 0 00-.0941.4233v.7275a4.2727 4.2727 0 008.5454 0l.0005-.726a.997.997 0 00-.0943-.4248zm-.9058 2.7841l1.7017 3.6392h-3.4032zm0 7.6392a2.268 2.268 0 01-2.2454-2h4.4903a2.268 2.268 0 01-2.2449 2z" /></svg>';
				div.style = 'float: right; margin-left: 5pt; margin-right: 5pt; padding: 0; visibility: visible; cursor: pointer;';
				div.className = 'compare-release';
				div.onclick = function(evt) {
					console.assert(evt.currentTarget instanceof HTMLElement);
					const setActive = (elem, active = true) => { elem.children[0].setAttribute('fill', active ? 'orange' : 'gray') };
					if (selected instanceof HTMLElement) {
						if (selected == evt.currentTarget) {
							selected = null;
							setActive(evt.currentTarget, false);
						} else {
							const target = evt.currentTarget;
							setActive(target, true);
							const trs = [selected, target].map(node => node.parentNode.parentNode);
							Promise.all(getTorrentIds(...trs).map(torrentId => getSessionsFromTorrent(torrentId)
									.then(releaseFingerprintFromSessions))).then(releases => testSimilarity(...releases)).then(function(remarks) {
								const permaLink = document.location.origin + '/torrents.php?torrentid=${torrentid}';
								if (remarks === true) {
									var message = 'Identical rips';
									var report = `Identical rip to [url=${permaLink}]\${editiontitle}[/url]`;
								} else {
									message = 'Releases may be duplicates (ToC shift/drift + peaks are too similar)';
									if (remarks.length > 0) message += '\n\n' + (maxRemarks > 0 && remarks.length > maxRemarks ?
										remarks.slice(0, maxRemarks - 1).join('\n') + '\n...' : remarks.join('\n'));
									const shorten = (index, sameStr) => report[index].length == 1 && report[index][0].startsWith('Disc 1') ?
										report[index][0].replace(/^Disc\s+\d+\s+/, '') : report[index].length > 0 ? report[index].join(', ') : sameStr;
									report = [remark => remark.includes('shifted'), remark => remark.includes('post-gap')].map(fn => remarks.filter(fn));
									report = `Same pressing as [url=${permaLink}]\${editiontitle}[/url] possible (${shorten(0, 'similar ToC(s)/peaks')}${shorten(1, '') ? ' with post-gap' : ''})`;
								}
								const getTorrentText = elem => (elem = elem.querySelector('a[href="#"][onclick]')) != null ? elem.textContent : undefined;
								const characteristics = trs.map(tr => [
									/* 0 */ /\b(?:(?:Pre|De)[\-\− ]?emphas|Pre-?gap\b|HTOA\b|Hidden\s+track|Clean|Censor)/i.test(getEditionTitle(tr)), // allowed to coexist
									/* 1 */ tr.querySelector('strong.tl_reported') != null,
									/* 2 */ (function(numberColumns) {
										console.assert(numberColumns.length == 4);
										return numberColumns.length >= 3 ? parseInt(numberColumns[2].textContent) : -1;
									})(tr.getElementsByClassName('number_column')),
									/* 3 */ Array.prototype.some.call(tr.querySelectorAll('strong.tl_notice'), strong => strong.textContent.trim() == 'Trumpable'),
									/* 4 */ (text => (text = /\bLog\s*\((\-?\d+)\%\)/.exec(text)) != null ?
										(text = parseInt(text[1])) >= 100 ? 100 : text > 0 ? 50 : 0 : NaN)(getTorrentText(tr)),
									/* 5 */ /\bCue\b/i.test(getTorrentText(tr)),
									/* 6 */ getTorrentId(tr),
								]);
								let userAuth = document.body.querySelector('input[name="auth"][value]');
								if (userAuth != null) userAuth = userAuth.value;
								if (!userAuth || characteristics.some(ch => ch[0] || ch[1])
										|| characteristics.filter(ch => ch[3]).length > 1) return alert(message);
								const indexByDelta = delta => delta > 0 ? 0 : delta < 0 ? 1 : -1;
								let trumpIndex = indexByDelta(Number(isNaN(characteristics[0][4])) - Number(isNaN(characteristics[1][4])));
								if (trumpIndex < 0) trumpIndex = indexByDelta(characteristics[1][4] - characteristics[0][4]);
								if (trumpIndex < 0) trumpIndex = indexByDelta(Number(characteristics[0][3]) - Number(characteristics[1][3]));
								if (trumpIndex < 0 && characteristics.every(ch => ch[4] >= 100))
									trumpIndex = indexByDelta(Number(characteristics[1][5]) - Number(characteristics[0][5]));
								let dupeIndex = trumpIndex < 0 ? indexByDelta(characteristics[0][6] - characteristics[1][6]) : -1;
								console.assert(trumpIndex < 0 != dupeIndex < 0);
								if (characteristics[1 - (trumpIndex < 0 ? dupeIndex : trumpIndex)][2] <= 0)
									return alert(message + '\n\nReporting not offered for lack of seeds');
								if (trumpIndex >= 0) {
									class ExtraInfo extends Array {
										constructor(torrentId) {
											super();
											if (torrentId > 0) torrentId = document.getElementById('release_' + torrentId); else return;
											if (torrentId != null) for (torrentId of torrentId.querySelectorAll(':scope > blockquote'))
												if ((torrentId = /^Trumpable For:\s+(.+)$/i.exec(torrentId.textContent.trim())) != null)
													Array.prototype.push.apply(this, torrentId[1].split(/\s*,\s*/));
										}
									}

									const extraInfo = new ExtraInfo(characteristics[trumpIndex][6]), trumpMappings = {
										lineage_trump: /\b(?:Lineage)\b/i,
										checksum_trump: /^(?:Bad\/No Checksum\(s\))$/i,
										tag_trump: /^(?:Bad Tags)$/i,
										folder_trump: /\b(?:Folder)\b/i,
										file_trump: /^(?:Bad File Names)$|\b(?:180)\b/i,
										pirate_trump: /\b(?:Pirate)\b/i,
									};
									var trumpType = 'trump';
									for (let type in trumpMappings) if (extraInfo.some(RegExp.prototype.test.bind(trumpMappings[type])))
										trumpType = type;
								}
								message += `\n\nProposed ${trumpIndex < 0 ? 'dupe' : trumpType.replace(/_/g, ' ')} report for ${getEditionTitle(trs[trumpIndex < 0 ? dupeIndex : trumpIndex])}`;
								if (!allowReports || trumpIndex >= 0 && (characteristics[trumpIndex][3] && trumpType == 'trump'
										|| characteristics.every(ch => ch[4] == 50))) return alert(message);
								if (confirm(message + `\n\nTake the report now?`)) LocalXHR.post('/reportsv2.php?action=takereport', new URLSearchParams({
									auth: userAuth,
									categoryid: 1,
									torrentid: characteristics[trumpIndex < 0 ? dupeIndex : trumpIndex][6],
									type: trumpIndex < 0 ? 'dupe' : trumpType,
									sitelink: permaLink.replace('${torrentid}', characteristics[1 - (trumpIndex < 0 ? dupeIndex : trumpIndex)][6]),
									extra: report.replace('${torrentid}', characteristics[1 - (trumpIndex < 0 ? dupeIndex : trumpIndex)][6])
										.replace('${editiontitle}', getEditionTitle(trs[1 - (trumpIndex < 0 ? dupeIndex : trumpIndex)])),
								}), { responseType: null }).then(status => { document.location.reload() }, alert);
							}).catch(reason => { alert('Releases not duplicates for the reason ' + reason) }).then(function() {
								for (let elem of [selected, target]) setActive(elem, false);
								selected = null;
							});
						}
					} else setActive(selected = evt.currentTarget, true);
				};
				div.title = 'Compare with different CD for similarity';
				const anchor = tr.querySelector('span.torrent_action_buttons');
				if (anchor != null) anchor.after(div);
			}

			function scanGroup(evt) {
				const compareWorkers = [ ];
				torrents.forEach(function(torrent1, ndx1) {
					torrents.forEach(function(torrent2, ndx2) {
						if (ndx2 > ndx1) compareWorkers.push(Promise.all(getTorrentIds(torrent1, torrent2).map(torrentId =>
							getSessionsFromTorrent(torrentId).then(releaseFingerprintFromSessions))).then(releases =>
								testSimilarity(...releases)).then(remarks => [torrent1, torrent2], reason => null));
					});
				});
				if (compareWorkers.length > 0) Promise.all(compareWorkers).then(function(results) {
					if ((results = results.filter(Array.isArray)).length > 0) try {
						results.forEach(function(sameTorrents, groupNdx) {
							const randColor = () => 0xD0 + Math.floor(Math.random() * (0xF8 - 0xD0));
							const color = ['#dff', '#ffd', '#fdd', '#dfd', '#ddf', '#fdf'][groupNdx]
								|| `rgb(${randColor()}, ${randColor()}, ${randColor()})`;
							for (let elem of sameTorrents) if ((elem = elem.querySelector('div.compare-release')) != null) {
								elem.style.padding = '2px';
								elem.style.border = '1px solid #808080';
								elem.style.borderRadius = '3px';
								elem.style.backgroundColor = color;
							}
						});
						alert('Similar CDs detected in these editions:\n\n' + results.map(sameTorrents =>
							'− ' + getEditionTitle(sameTorrents[0]) + '\n− ' + getEditionTitle(sameTorrents[1])).join('\n\n'));
					} catch (e) { alert(e) } else alert('No similar CDs detected');
				});
			}
			const container = document.body.querySelector('table#torrent_details > tbody > tr.colhead_dark > td:first-of-type');
			if (container != null) container.append(Object.assign(document.createElement('SPAN'), {
				className: 'brackets',
				textContent: 'Find CD dupes',
				style: 'margin-left: 5pt; margin-right: 5pt; float: right; cursor: pointer; font-size: 8pt;',
				onclick: scanGroup,
			}));
			GM_registerMenuCommand('Find CD dupes', scanGroup, 'd');
		}

		function duplicityPrecheck() {
			const dialog = document.createElement('dialog'), submit = 'Check for duplicity';
			dialog.innerHTML = `
<form method="dialog" style="padding: 1rem; background-color: darkslategray; color: white; display: flex; flex-flow: column nowrap; row-gap: 10pt;">
<div name="cd-log-text">
	<div style="margin-bottom: 5pt;">Paste .LOG content (for multi disc albums paste all logs one after another)</div>
	<textarea rows="40" cols="80" spellcheck="false" wrap="off" style="font: 8pt monospace; padding: 5px; color: white; background-color: #152323;"></textarea>
</div>
<div name="cd-log-files">Or select file(s): <input type="file" accept=".log" multiple style="font-size: 9pt;" /></div>
<div style="text-align: center; display: flex; flex-flow: row; justify-content: flex-start; column-gap: 10pt;"><input type="submit" value="${submit}" style="margin: 0;" /><input type="button" name="close" value="Close" style="margin: 0;" /></div>
</form>
`;
			dialog.style = 'position: fixed; top: 0; left: 0; margin: auto; max-width: 75%; max-height: 90%; box-shadow: 5px 5px 10px black; z-index: 99999;';
			dialog.onclose = function(evt) {
				document.body.removeChild(evt.currentTarget);
				if (evt.currentTarget.returnValue != submit) return;
				const logFilesAdaptor = logFiles => (logFiles = getSessionsFromLogs(logFiles, true)) != null ?
					Promise.resolve(logFiles) : Promise.reject('No valid input');
				Promise.all(Array.from(form.querySelector('[name="cd-log-files"] input[type="file"]').files, file => new Promise(function(resolve, reject) {
					const fr = new FileReader;
					fr.onload = evt => { resolve(evt.currentTarget.result) };
					fr.onerror = evt => { reject('File reading error') };
					fr.readAsText(file);
				}))).then(logFilesAdaptor).catch(reason => logFilesAdaptor(Array.from(form.querySelectorAll('[name="cd-log-text"] textarea'),
						textArea => textArea.value))).then(function(userSessions) {
					Promise.all(torrents.map(torrent => getSessionsFromTorrent(...getTorrentIds(torrent)).then(torrentSessions =>
							testSimilarity(...[userSessions, torrentSessions].map(releaseFingerprintFromSessions), true)).then(remarks => ({
						torrent: torrent,
						remarks: remarks,
					}), reason => null))).then(function(results) {
						if ((results = results.filter(Boolean)).length > 0) {
							alert('This pressing is considered dupe to\n\n' + results.map(function(result, index) {
								let message = getEditionTitle(result.torrent);
								if (result.remarks === true) message += '\nIdentical rips';
								else if (Array.isArray(result.remarks) && result.remarks.length > 0)
									message += '\n' + result.remarks.map(remark => '\t' + remark).join('\n');
								return message;
							}).join('\n\n'));
						} else alert('This pressing is unique within the release group');
					});
				}, alert);
			};
			const form = dialog.firstElementChild;
			form.elements.namedItem('close').onclick = evt => { dialog.close() };
			document.body.append(dialog);
			dialog.showModal();
		}
		const linkbox = document.body.querySelector('div.header > div.linkbox');
		GM_registerMenuCommand('CD rip duplicity precheck', duplicityPrecheck, 'd');

		function tocEntriesFromCTDB(url) {
			try { url = new URL(url) } catch(e) { return Promise.reject('Invalid URL') }
			return url.hostname == 'db.cue.tools' ? GlobalXHR.get(url, { responseType: 'text' }).then(function({responseText}) {
				let data = /^\s*var data = ctdbEntryData\((\{.+\})\);/m.exec(responseText) || /\bctdbEntryData\((\{.+\})\);/.exec(responseText);
				if (data != null) data = eval('(' + data[1] + ')');
				else return Promise.reject('Invalid url or CTDB entry data could not be extracted');
				const entries = data.rows.map(function(row) {
					const entry = Object.assign.apply(null, data.cols.map((col, index) => ({ [col.label]: row.c[index].v })));
					if (entry.TOC) entry.TOC = entry.TOC.split(':').map(offset => parseInt(offset)); else throw 'Assertion failed: no TOC table';
					if (entry['Track CRCs']) entry['Track CRCs'] = entry['Track CRCs'].split(' ').map(crc => parseInt(crc, 16));
					return entry;
				});
				console.assert(entries.length > 0, data);
				return Object.freeze([Object.freeze(entries.map(entry => Object.freeze(Object.assign(Array.from(Array(entry.TOC.length - 1), (_, index) => Object.freeze(exportTocEntry({
					trackNumber: index + 1,
					startSector: entry.TOC[index],
					endSector: entry.TOC[index + 1] - 1,
					crc32: index > 0 && index < entry.TOC.length - 2 ? entry?.['Track CRCs']?.[index] : undefined,
				}))), { source: 'ctdb' }))))]);
			}) : Promise.reject('Invalid URL');
		}
		function tocEntriesFromMB(url) {
			try { url = new URL(url) } catch(e) { return Promise.reject('Invalid URL') }
			const hostname = 'musicbrainz.org';
			if (![hostname, `beta.${hostname}`].includes(url.hostname)) return Promise.reject('Invalid URL');
			url = /^\/release\/([\da-f]{8}-[\da-f]{4}-[\da-f]{4}-[\da-f]{4}-[\da-f]{12})\b/i.exec(url.pathname);
			if (url != null) url = url[1]; else return Promise.reject('Invalid URL');
			return GlobalXHR.get(`https://${hostname}/ws/2/release/${url}?fmt=json&inc=media%2Bdiscids`, { responseType: 'json' }).then(function({json}) {
				const media = json.media.filter(medium => /^(?:(?:SHM-|HD|HQ|DTS |Enhanced |Blu-spec |Copy Control |Minimax |Mixed Mode )?CD|CD-R|(?:8cm )?CD(?:\+G)?|Hybrid SACD(?: \(CD layer\))?|DualDisc(?: \(CD side\))?)$/.test(medium.format) || !medium.format && medium?.discs?.length > 0);
				if (media.length <= 0) return Promise.reject('Release without CD media');
				if (!media.every(medium => medium?.discs?.length > 0)) return Promise.reject('Some media miss disc ID');
				return Object.freeze(media.map(medium => Object.freeze(medium.discs.map(function(discId) {
					const offsets = discId.offsets.concat(discId.sectors).map(offset => offset - 150);
					return Object.freeze(Object.assign(Array.from(Array(discId['offset-count']), (_, index) => Object.freeze(exportTocEntry({
						trackNumber: index + 1,
						startSector: offsets[index],
						endSector: offsets[index + 1] - 1,
					}))), { source: 'musicbrainz' }));
				}))));
			});
		}
		function publicDbDuplicityPrecheck(publicRelease) {
			if (!(publicRelease instanceof Object)) throw 'Invalid argument';
			const discIdCounts = publicRelease.map(discIds => discIds.length);
			publicRelease = (function discMapper(tocEntries = [ ]) {
				if (!(tocEntries.length < publicRelease.length)) return [tocEntries];
				tocEntries = publicRelease[tocEntries.length].map(discid => discMapper(tocEntries.concat([discid])));
				return Array.prototype.concat.apply([ ], tocEntries);
			})();
			Promise.all(torrents.map(torrent => getSessionsFromTorrent(...getTorrentIds(torrent)).then(releaseFingerprintFromSessions).then(function(torrentRelease) {
				if (torrentRelease == null) return Promise.reject('Invalid release fingerprint');
				const evaluator = result => result.remarks.filter(RegExp.prototype.test.bind(/\b(?:checksums matched)\b/i)).length;
				const results = publicRelease.map(function(tocEntries) {
					try {
						const remarks = testSimilarity(tocEntries, torrentRelease, true);
						return { torrent: torrent, remarks: remarks };
					} catch(e) { return null };
				}).filter(result => result != null).sort((a, b) => evaluator(b) - evaluator(a));
				return results.length > 0 ? results[0] : null;
			}).catch(function(reason) {
				console.warn(reason);
				return null;
			}))).then(function(results) {
				if ((results = results.filter(result => result != null)).length > 0) {
					const message = ['This edition may be dupe to'];
					Array.prototype.push.apply(message, results.map(function(result, index) {
						let message = getEditionTitle(result.torrent);
						if (Array.isArray(result.remarks) && result.remarks.length > 0)
							message += '\n' + result.remarks.map(remark => '    ' + remark).join('\n');
						return message;
					}));
					message.push('Note: peaks are not provided by public databases - unless checksums are matching, this edition still may be unique pressing');
					if (discIdCounts.some(count => count > 1))
						message.push('Note: some media have multiple ToCs attached, consider the positive result uncertain');
					alert(message.join('\n\n'));
				} else alert('This pressing is unique within the release group');
			}, alert);
		}
		GM_registerMenuCommand('Public database duplicity precheck', function(evt) {
			let url = prompt('Edition duplicity to UR precheck\n\nEnter release url in public database:\n(it can be a MusicBrainz release link or CueTools Db link in format https://db.cue.tools/cd/{ID})\n\n');
			if (!url) return; else try { url = new URL(url) } catch(e) { return alert(e) }
			switch (url.hostname) {
				case 'db.cue.tools': var fingerprintParser = tocEntriesFromCTDB; break;
				case 'musicbrainz.org': case 'beta.musicbrainz.org': fingerprintParser = tocEntriesFromMB; break;
				default: return alert('Invalid URL');
			}
			fingerprintParser(url).then(publicDbDuplicityPrecheck, alert);
		});

		break;
	}
	case '/upload.php': {
		function installLogWatchers(logFields) {
			console.assert(logFields instanceof HTMLElement);
			if (!(logFields instanceof HTMLElement)) return;
			const selector = 'input[type="file"]', listener = ['input', function(evt) {
				if (form.querySelector('table#upload-assistant') != null) return;
				dupeStatus = undefined;
				let allLogs = Array.from(logFields.querySelectorAll(selector), input => Array.from(input.files));
				const allSlotsTaken = allLogs.every(files => files.length > 0);
				allLogs = Array.prototype.concat.apply([ ], allLogs)
					.filter(file => file.name.toLowerCase().endsWith('.log'));
				if (allLogs.length > 0) allLogs = Promise.all(allLogs.map(logFile => new Promise(function(resolve, reject) {
					const fr = new FileReader;
					fr.onload = evt => { resolve(evt.currentTarget.result) };
					fr.onerror = evt => { reject(`Log file reading error (${logFile.name})`) };
					fr.readAsText(logFile);
				}))); else return;
				if (!(torrents instanceof Promise)) torrents =
					queryAjaxAPI('torrentgroup', { id: groupId }).then(torrentGroup =>
						torrentGroup.torrents.filter(torrent => torrent.hasLog && !torrent.reported));
				Promise.all([allLogs, torrents]).then(function([logs, torrents]) {
					if (torrents.length <= 0) return;
					const userSessions = getSessionsFromLogs(logs, true);
					if (userSessions != null) Promise.all(torrents.map(torrent => getSessionsFromTorrent(torrent.id).then(torrentSessions =>
							testSimilarity(...[userSessions, torrentSessions].map(releaseFingerprintFromSessions), true)).then(remarks => ({
						torrent: torrent,
						remarks: remarks,
					}), function(reason) {
						console.info('Torrent #%d:', torrent.id, reason);
						return null;
					}))).then(results => results.filter(Boolean)).then(function(results) {
						const toMessage = (torrents = results) => torrents.map(function(result, index) {
							let message = `- Torrent #${result.torrent.id}: ${result.torrent.remasterYear > 0 ? `${result.torrent.remasterYear} - ${[
								'remasterRecordLabel',
								'remasterCatalogueNumber',
								'remasterTitle',
							].map(prop => result.torrent[prop]).filter(Boolean).join(' / ')}` : (result.torrent.remastered ? 'unknown' : 'unconfirmed') + ' edition'}`;
							const indent = ' '.repeat(8); // '\t';
							if (result.remarks === true) message += `\n${indent}Identical rips`;
							else if (Array.isArray(result.remarks) && result.remarks.length > 0)
								message += '\n' + result.remarks.map(remark => indent + remark).join('\n');
							return message;
						}).join('\n');
						const strictDupes = results.filter(result => !result.torrent.trumpable && result.torrent.logScore >= 100);
						if (strictDupes.length > 0) dupeStatus = 'Warning: this mastering will be considered dupe to these editions:\n\n' + toMessage(strictDupes);
						else if (results.length > 0) dupeStatus = 'Notice: unless uploading a trump, this mastering will be considered dupe to these editions:\n\n' + toMessage(results);
						if (dupeStatus) alert(dupeStatus + '\n\n(If this is a multi disc release with .log files left to add, the message can be ignored)');
					}); else console.log('No valid logfiles attached');
				}, reason => { console.warn(`CD duplicity test failed to perform for the reason: ${reason}`) });
			}], setLogWatcher = input => { input.addEventListener(...listener) };
			logFields.querySelectorAll(selector).forEach(setLogWatcher);
			let logsWatcher = new MutationObserver(function(ml, mo) {
				for (let mutation of ml) {
					for (let node of mutation.addedNodes) if (node.nodeType == Node.ELEMENT_NODE
							&& node.matches(selector)) setLogWatcher(node);
					for (let node of mutation.removedNodes) if (node.nodeType == Node.ELEMENT_NODE
							&& node.matches(selector)) node.removeEventListener(...listener);
				}
			});
			logsWatcher.observe(logFields, { childList: true });
		}

		if (document.body.querySelector('form#upload_table table#upload-assistant') != null) break;
		const groupId = parseInt(new URLSearchParams(document.location.search).get('groupid'));
		console.assert(groupId > 0);
		if (!(groupId > 0)) break;
		const form = document.body.querySelector('form#upload_table');
		if (form == null) break; // assertion failed
		const category = form.querySelector('select#categories');
		console.assert(category != null);
		if (category == null || category.options[category.selectedIndex].text != 'Music') break;
		let torrents, dupeStatus;
		installLogWatchers(form.querySelector('div#dynamic_form td#logfields'));
		// form.addEventListener('submit', function(evt) {
		// 	if (!dupeStatus || confirm(dupeStatus + '\n\nUpload anyway?')) return true;
		// 	evt.preventDefault();
		// 	return false;
		// });
		break;
	}
}