/*
 * Trivia plugin
 * Written by Morfent
 */

import {FS} from '../../lib/fs';
import {Utils} from '../../lib/utils';

const MAIN_CATEGORIES: {[k: string]: string} = {
	ae: 'Arts and Entertainment',
	pokemon: 'Pok\u00E9mon',
	sg: 'Science and Geography',
	sh: 'Society and Humanities',
};

const SPECIAL_CATEGORIES: {[k: string]: string} = {
	misc: 'Miscellaneous',
	subcat: 'Sub-Category 1',
	subcat2: 'Sub-Category 2',
	subcat3: 'Sub-Category 3',
	subcat4: 'Sub-Category 4',
	subcat5: 'Sub-Category 5',
};

const ALL_CATEGORIES: {[k: string]: string} = {
	ae: 'Arts and Entertainment',
	misc: 'Miscellaneous',
	pokemon: 'Pok\u00E9mon',
	sg: 'Science and Geography',
	sh: 'Society and Humanities',
	subcat: 'Sub-Category 1',
	subcat2: 'Sub-Category 2',
	subcat3: 'Sub-Category 3',
	subcat4: 'Sub-Category 4',
	subcat5: 'Sub-Category 5',
};

/**
 * Aliases for keys in the ALL_CATEGORIES object.
 */
const CATEGORY_ALIASES: {[k: string]: ID} = {
	poke: 'pokemon' as ID,
};

const MODES: {[k: string]: string} = {
	first: 'First',
	number: 'Number',
	timer: 'Timer',
	triumvirate: 'Triumvirate',
};

const LENGTHS: {[k: string]: {cap: number | false, prizes: number[]}} = {
	short: {
		cap: 20,
		prizes: [3, 2, 1],
	},
	medium: {
		cap: 35,
		prizes: [4, 2, 1],
	},
	long: {
		cap: 50,
		prizes: [5, 3, 1],
	},
	infinite: {
		cap: false,
		prizes: [5, 3, 1],
	},
};

Object.setPrototypeOf(MAIN_CATEGORIES, null);
Object.setPrototypeOf(SPECIAL_CATEGORIES, null);
Object.setPrototypeOf(ALL_CATEGORIES, null);
Object.setPrototypeOf(MODES, null);
Object.setPrototypeOf(LENGTHS, null);

const SIGNUP_PHASE = 'signups';
const QUESTION_PHASE = 'question';
const INTERMISSION_PHASE = 'intermission';
const LIMBO_PHASE = 'limbo';

const MASTERMIND_ROUNDS_PHASE = 'rounds';
const MASTERMIND_FINALS_PHASE = 'finals';

const MINIMUM_PLAYERS = 3;
const START_TIMEOUT = 30 * 1000;
const MASTERMIND_FINALS_START_TIMEOUT = 30 * 1000;
const INTERMISSION_INTERVAL = 20 * 1000;
const MASTERMIND_INTERMISSION_INTERVAL = 500; // 0.5 seconds
const PAUSE_INTERMISSION = 5 * 1000;

const MAX_QUESTION_LENGTH = 252;
const MAX_ANSWER_LENGTH = 32;

interface TriviaQuestion {
	question: string;
	category: string;
	answers: string[];
	user?: string;
	type?: string;
}

type TriviaRank = [number, number, number];

interface TriviaLeaderboard {
	[k: string]: TriviaRank;
}

interface TriviaGame {
	mode: string;
	length: string;
	category: string;
	creator?: string;
}

type TriviaLadder = TriviaRank[][];

interface TriviaData {
	/** category:questions */
	questions?: {[k: string]: TriviaQuestion[]};
	submissions?: {[k: string]: TriviaQuestion[]};
	leaderboard?: TriviaLeaderboard;
	altLeaderboard?: TriviaLeaderboard;
	ladder?: TriviaLadder;
	history?: TriviaGame[];
}

interface TopPlayer {
	id: string;
	player: TriviaPlayer;
	name: string;
}

const PATH = 'config/chat-plugins/triviadata.json';

/**
 * TODO: move trivia database code to a separate file once relevant.
 */
export let triviaData: TriviaData = {};
try {
	triviaData = JSON.parse(FS(PATH).readIfExistsSync() || "{}");
} catch (e) {} // file doesn't exist or contains invalid JSON

if (!triviaData || typeof triviaData !== 'object') triviaData = {};
if (typeof triviaData.leaderboard !== 'object') triviaData.leaderboard = {};
if (typeof triviaData.altLeaderboard !== 'object') triviaData.altLeaderboard = {};
if (typeof triviaData.questions !== 'object') triviaData.questions = {};
if (typeof triviaData.submissions !== 'object') triviaData.submissions = {};

// Handle legacy question formats
if (Array.isArray(triviaData.submissions)) {
	const oldSubmissions = triviaData.submissions as TriviaQuestion[];
	triviaData.submissions = {};

	for (const question of oldSubmissions) {
		if (!(question.category in triviaData.submissions)) triviaData.submissions[question.category] = [];
		triviaData.submissions[question.category].push(question);
	}
}
if (Array.isArray(triviaData.questions)) {
	const oldSubmissions = triviaData.questions as TriviaQuestion[];
	triviaData.questions = {};

	for (const question of oldSubmissions) {
		if (!(question.category in triviaData.questions)) triviaData.questions[question.category] = [];
		triviaData.questions[question.category].push(question);
	}
}


/** from:to Map */
export const pendingAltMerges = new Map<ID, ID>();

function getTriviaGame(room: Room | null) {
	if (!room) {
		throw new Chat.ErrorMessage(`This command can only be used in the Trivia room.`);
	}
	const game = room.game;
	if (!game) {
		throw new Chat.ErrorMessage(room.tr`There is no game in progress.`);
	}
	if (game.gameid !== 'trivia') {
		throw new Chat.ErrorMessage(room.tr`The currently running game is not Trivia, it's ${game.title}.`);
	}
	return game as Trivia;
}

function getMastermindGame(room: Room | null) {
	if (!room) {
		throw new Chat.ErrorMessage(`This command can only be used in the Trivia room.`);
	}
	const game = room.game;
	if (!game) {
		throw new Chat.ErrorMessage(room.tr`There is no game in progress.`);
	}
	if (game.gameid !== 'mastermind') {
		throw new Chat.ErrorMessage(room.tr`The currently running game is not Mastermind, it's ${game.title}.`);
	}
	return game as Mastermind;
}

function getTriviaOrMastermindGame(room: Room | null) {
	try {
		return getMastermindGame(room);
	} catch (e) {
		return getTriviaGame(room);
	}
}

export function writeTriviaData() {
	FS(PATH).writeUpdate(() => (
		JSON.stringify(triviaData, null, 2)
	));
}

/**
 * Generates and broadcasts the HTML for a generic announcement containing
 * a title and an optional message.
 */
function broadcast(room: BasicRoom, title: string, message?: string) {
	let buffer = `<div class="broadcast-blue"><strong>${title}</strong>`;
	if (message) buffer += `<br />${message}`;
	buffer += '</div>';

	return room.addRaw(buffer).update();
}

function getQuestions(category: ID): TriviaQuestion[] {
	const isRandomCategory = (category === 'random');
	const isAll = (category === 'all');
	if (isRandomCategory) {
		const lastCategoryID = toID(triviaData.history?.slice(-1)[0].category).replace("random", "");
		const categories = Object.keys(MAIN_CATEGORIES).filter(cat => toID(MAIN_CATEGORIES[cat]) !== lastCategoryID);
		const randCategory = categories[Math.floor(Math.random() * categories.length)];
		return [...triviaData.questions![randCategory]];
	} else if (isAll) {
		const questions: TriviaQuestion[] = [];
		for (const categoryStr in MAIN_CATEGORIES) {
			questions.push(...(triviaData.questions![categoryStr] || []));
		}
		return questions;
	} else if (ALL_CATEGORIES[category]) {
		return [...triviaData.questions![category]];
	} else {
		throw new Chat.ErrorMessage(`"${category}" is an invalid category.`);
	}
}

function hasLeaderboardEntry(userid: ID) {
	return userid in triviaData.leaderboard! || userid in triviaData.altLeaderboard!;
}

/**
 * Records a pending alt merge
 */
export function requestAltMerge(from: ID, to: ID) {
	if (from === to) throw new Chat.ErrorMessage(`You cannot merge leaderboard entries with yourself!`);
	if (!hasLeaderboardEntry(from)) {
		throw new Chat.ErrorMessage(`The user '${from}' does not have an entry in the Trivia leaderboard.`);
	}
	if (!hasLeaderboardEntry(to)) {
		throw new Chat.ErrorMessage(`The user '${to}' does not have an entry in the Trivia leaderboard.`);
	}

	pendingAltMerges.set(from, to);
}


/**
 * Checks that it has been approved by both users,
 * and merges two alts on the Trivia leaderboard.
 */
export function mergeAlts(from: ID, to: ID) {
	if (pendingAltMerges.get(from) !== to) {
		throw new Chat.ErrorMessage(`Both '${from}' and '${to}' must use /trivia mergescore to approve the merge.`);
	}

	if (!hasLeaderboardEntry(to)) {
		throw new Chat.ErrorMessage(`The user '${to}' does not have an entry in the Trivia leaderboard.`);
	}
	if (!hasLeaderboardEntry(from)) {
		throw new Chat.ErrorMessage(`The user '${from}' does not have an entry in the Trivia leaderboard.`);
	}

	for (const leaderboard of [triviaData.altLeaderboard!, triviaData.leaderboard!]) {
		if (leaderboard[to] && leaderboard[from]) {
			for (let i = 0; i < leaderboard[to].length; i++) {
				leaderboard[to][i] += leaderboard[from][i];
			}
			delete leaderboard[from];
		}
	}

	writeTriviaData();
	cachedLadder.invalidateCache();
	cachedAltLadder.invalidateCache();
}

class Ladder {
	leaderboard: TriviaLeaderboard;
	cache: {ladder: TriviaLadder, ranks: TriviaLeaderboard} | null;
	constructor(leaderboard: TriviaLeaderboard) {
		this.leaderboard = leaderboard;
		this.cache = null;
	}

	invalidateCache() {
		this.cache = null;
	}

	get() {
		if (this.cache) {
			return this.cache;
		}
		this.cache = this.computeCachedLadder();
		return this.cache;
	}

	computeCachedLadder() {
		const leaders = Object.keys(this.leaderboard);
		const ladder: TriviaLadder = [];
		const ranks: TriviaLeaderboard = {};
		for (const leader of leaders) {
			ranks[leader] = [0, 0, 0];
		}
		for (let i = 0; i < 3; i++) {
			leaders.sort((a, b) => this.leaderboard[b][i] - this.leaderboard[a][i]);

			let max = Infinity;
			let rank = -1;
			for (const leader of leaders) {
				const score = this.leaderboard[leader][i];
				if (max !== score) {
					rank++;
					max = score;
				}
				if (i === 0 && rank < 15) {
					if (!ladder[rank]) ladder[rank] = [];
					ladder[rank].push(leader as unknown as TriviaRank);
				}
				ranks[leader][i] = rank + 1;
			}
		}
		return {ladder, ranks};
	}
}

export const cachedLadder = new Ladder(triviaData.leaderboard);
export const cachedAltLadder = new Ladder(triviaData.altLeaderboard);

class TriviaPlayer extends Rooms.RoomGamePlayer {
	points: number;
	correctAnswers: number;
	answer: string;
	currentAnsweredAt: number[];
	lastQuestion: number;
	answeredAt: number[];
	isCorrect: boolean;
	isAbsent: boolean;

	constructor(user: User, game: RoomGame) {
		super(user, game);
		this.points = 0;
		this.correctAnswers = 0;
		this.answer = '';
		this.currentAnsweredAt = [];
		this.lastQuestion = 0;
		this.answeredAt = [];
		this.isCorrect = false;
		this.isAbsent = false;
	}

	setAnswer(answer: string, isCorrect?: boolean) {
		this.answer = answer;
		this.currentAnsweredAt = process.hrtime();
		this.isCorrect = !!isCorrect;
	}

	incrementPoints(points = 0, lastQuestion = 0) {
		this.points += points;
		this.answeredAt = this.currentAnsweredAt;
		this.lastQuestion = lastQuestion;
		this.correctAnswers++;
	}

	clearAnswer() {
		this.answer = '';
		this.isCorrect = false;
	}

	toggleAbsence() {
		this.isAbsent = !this.isAbsent;
	}

	reset() {
		this.points = 0;
		this.correctAnswers = 0;
		this.answer = '';
		this.answeredAt = [];
		this.isCorrect = false;
	}
}

export class Trivia extends Rooms.RoomGame {
	playerTable: {[k: string]: TriviaPlayer};
	gameid: ID;
	minPlayers: number;
	kickedUsers: Set<string>;
	canLateJoin: boolean;
	game: TriviaGame;
	questions: TriviaQuestion[];
	isPaused = false;
	phase: string;
	phaseTimeout: NodeJS.Timer | null;
	questionNumber: number;
	curQuestion: string;
	curAnswers: string[];
	askedAt: number[];
	constructor(
		room: Room, mode: string, category: string,
		length: string, questions: TriviaQuestion[], creator: string,
		isRandomMode = false, isSubGame = false
	) {
		super(room, isSubGame);
		this.playerTable = {};
		this.gameid = 'trivia' as ID;
		this.title = 'Trivia';
		this.allowRenames = true;
		this.playerCap = Number.MAX_SAFE_INTEGER;

		this.minPlayers = MINIMUM_PLAYERS;
		this.kickedUsers = new Set();
		this.canLateJoin = true;

		switch (category) {
		case 'all':
			category = this.room.tr`All`; break;
		case 'random':
			category = this.room.tr`Random (${ALL_CATEGORIES[questions[0].category]})`; break;
		default:
			category = ALL_CATEGORIES[CATEGORY_ALIASES[category] || category];
		}

		this.game = {
			mode: (isRandomMode ? `Random (${MODES[mode]})` : MODES[mode]),
			length: length,
			category: category,
			creator: creator,
		};

		this.questions = questions;

		this.phase = SIGNUP_PHASE;
		this.phaseTimeout = null;

		this.questionNumber = 0;
		this.curQuestion = '';
		this.curAnswers = [];
		this.askedAt = [];

		this.init();
	}

	setPhaseTimeout(callback: (...args: any[]) => void, timeout: number) {
		if (this.phaseTimeout) {
			clearTimeout(this.phaseTimeout);
		}
		this.phaseTimeout = setTimeout(callback, timeout);
	}

	getCap() {
		return LENGTHS[this.game.length].cap;
	}

	/**
	 * How long the players should have to answer a question.
	 */
	getRoundLength() {
		return 12 * 1000 + 500;
	}

	addTriviaPlayer(user: User) {
		if (this.playerTable[user.id]) {
			throw new Chat.ErrorMessage(this.room.tr`You have already signed up for this game.`);
		}
		for (const id of user.previousIDs) {
			if (this.playerTable[id]) throw new Chat.ErrorMessage(this.room.tr`You have already signed up for this game.`);
		}
		if (this.kickedUsers.has(user.id)) {
			throw new Chat.ErrorMessage(this.room.tr`You were kicked from the game and thus cannot join it again.`);
		}
		for (const id of user.previousIDs) {
			if (this.playerTable[id]) {
				throw new Chat.ErrorMessage(this.room.tr`You have already signed up for this game.`);
			}
			if (this.kickedUsers.has(id)) {
				throw new Chat.ErrorMessage(this.room.tr`You were kicked from the game and cannot join until the next game.`);
			}
		}

		for (const id in this.playerTable) {
			const targetUser = Users.get(id);
			if (targetUser) {
				const isSameUser = (
					targetUser.previousIDs.includes(user.id) ||
					targetUser.previousIDs.some(tarId => user.previousIDs.includes(tarId)) ||
					!Config.noipchecks && targetUser.ips.some(ip => user.ips.includes(ip))
				);
				if (isSameUser) throw new Chat.ErrorMessage(this.room.tr`You have already signed up for this game.`);
			}
		}
		if (this.phase !== SIGNUP_PHASE && !this.canLateJoin) {
			throw new Chat.ErrorMessage(this.room.tr`This game does not allow latejoins.`);
		}
		this.addPlayer(user);
	}

	makePlayer(user: User): TriviaPlayer {
		return new TriviaPlayer(user, this);
	}

	destroy() {
		if (this.phaseTimeout) clearTimeout(this.phaseTimeout);
		this.phaseTimeout = null;
		this.kickedUsers.clear();
		super.destroy();
	}

	onConnect(user: User) {
		const player = this.playerTable[user.id];
		if (!player || !player.isAbsent) return false;

		player.toggleAbsence();
		if (++this.playerCount < MINIMUM_PLAYERS) return false;
		if (this.phase !== LIMBO_PHASE) return false;

		for (const i in this.playerTable) {
			this.playerTable[i].clearAnswer();
		}

		broadcast(
			this.room,
			this.room.tr`Enough players have returned to continue the game!`,
			this.room.tr`The game will continue with the next question.`
		);
		this.askQuestion();
		return true;
	}

	onLeave(user: User, oldUserID: ID) {
		// The user cannot participate, but their score should be kept
		// regardless in cases of disconnects.
		const player = this.playerTable[oldUserID || user.id];
		if (!player || player.isAbsent) return false;

		player.toggleAbsence();
		if (--this.playerCount >= MINIMUM_PLAYERS) return false;

		// At least let the game start first!!
		if (this.phase === SIGNUP_PHASE) return false;

		if (this.phaseTimeout) clearTimeout(this.phaseTimeout);
		this.phaseTimeout = null;
		this.phase = LIMBO_PHASE;
		broadcast(
			this.room,
			this.room.tr`Not enough players are participating to continue the game!`,
			this.room.tr`Until there are ${MINIMUM_PLAYERS} players participating and present, the game will be paused.`
		);
		return true;
	}

	/**
	 * Handles setup that shouldn't be done from the constructor.
	 */
	init() {
		const cap = this.getCap() || this.room.tr`Infinite`;
		broadcast(
			this.room,
			this.room.tr`Signups for a new trivia game have begun!`,
			this.room.tr`Mode: ${this.game.mode} | Category: ${this.game.category} | Score cap: ${cap}<br />` +
			this.room.tr`Enter /trivia join to sign up for the trivia game.`
		);
	}

	getDescription() {
		const cap = this.getCap() || this.room.tr`Infinite`;
		return this.room.tr`Mode: ${this.game.mode} | Category: ${this.game.category} | Score cap: ${cap}`;
	}

	/**
	 * Formats the player list for display when using /trivia players.
	 */
	formatPlayerList(settings: {max: number | null, requirePoints?: boolean}) {
		return this.getTopPlayers(settings).map(player => {
			const buf = Utils.html`${player.name} (${player.player.points || "0"})`;
			return player.player.isAbsent ? `<span style="color: #444444">${buf}</span>` : buf;
		}).join(', ');
	}

	/**
	 * Kicks a player from the game, preventing them from joining it again
	 * until the next game begins.
	 */
	kick(user: User) {
		if (!this.playerTable[user.id]) {
			if (this.kickedUsers.has(user.id)) {
				throw new Chat.ErrorMessage(this.room.tr`User ${user.name} has already been kicked from the game.`);
			}

			for (const id of user.previousIDs) {
				if (this.kickedUsers.has(id)) {
					throw new Chat.ErrorMessage(this.room.tr`User ${user.name} has already been kicked from the game.`);
				}
			}

			for (const kickedUserid of this.kickedUsers) {
				const kickedUser = Users.get(kickedUserid);
				if (kickedUser) {
					const isSameUser = (
						kickedUser.previousIDs.includes(user.id) ||
						kickedUser.previousIDs.some(id => user.previousIDs.includes(id)) ||
						!Config.noipchecks && kickedUser.ips.some(ip => user.ips.includes(ip))
					);
					if (isSameUser) throw new Chat.ErrorMessage(this.room.tr`User ${user.name} has already been kicked from the game.`);
				}
			}

			throw new Chat.ErrorMessage(this.room.tr`User ${user.name} is not a player in the game.`);
		}

		this.kickedUsers.add(user.id);
		for (const id of user.previousIDs) {
			this.kickedUsers.add(id);
		}

		super.removePlayer(user);
	}

	leave(user: User) {
		if (!this.playerTable[user.id]) {
			throw new Chat.ErrorMessage(this.room.tr`You are not a player in the current game.`);
		}
		super.removePlayer(user);
	}

	/**
	 * Starts the question loop for a trivia game in its signup phase.
	 */
	start() {
		if (this.phase !== SIGNUP_PHASE) throw new Chat.ErrorMessage(this.room.tr`The game has already been started.`);
		if (this.playerCount < this.minPlayers) {
			throw new Chat.ErrorMessage(this.room.tr`Not enough players have signed up yet! At least ${this.minPlayers} players to begin.`);
		}

		broadcast(this.room, this.room.tr`The game will begin in ${START_TIMEOUT / 1000} seconds...`);
		this.phase = INTERMISSION_PHASE;
		this.setPhaseTimeout(() => this.askQuestion(), START_TIMEOUT);
	}

	pause() {
		if (this.isPaused) throw new Chat.ErrorMessage(this.room.tr`The trivia game is already paused.`);
		if (this.phase === QUESTION_PHASE) {
			throw new Chat.ErrorMessage(this.room.tr`You cannot pause the trivia game during a question.`);
		}
		this.isPaused = true;
		broadcast(this.room, this.room.tr`The Trivia game has been paused.`);
	}

	resume() {
		if (!this.isPaused) throw new Chat.ErrorMessage(this.room.tr`The trivia game is not paused.`);
		this.isPaused = false;
		broadcast(this.room, this.room.tr`The Trivia game has been resumed.`);
		if (this.phase === INTERMISSION_PHASE) this.setPhaseTimeout(() => this.askQuestion(), PAUSE_INTERMISSION);
	}

	/**
	 * Broadcasts the next question on the questions list to the room and sets
	 * a timeout to tally the answers received.
	 */
	askQuestion() {
		if (this.isPaused) return;
		if (!this.questions.length) {
			if (!this.getCap()) {
				// If there's no score cap, we declare a winner when we run out of questions,
				// instead of ending a game with a stalemate
				this.win(`The game of Trivia has ended because there are no more questions!`);
				return;
			}
			if (this.phaseTimeout) clearTimeout(this.phaseTimeout);
			this.phaseTimeout = null;
			broadcast(
				this.room,
				this.room.tr`No questions are left!`,
				this.room.tr`The game has reached a stalemate`
			);
			if (this.room) this.destroy();
			return;
		}

		this.phase = QUESTION_PHASE;
		this.askedAt = process.hrtime();

		const question = this.questions.pop()!;
		this.questionNumber++;
		this.curQuestion = question.question;
		this.curAnswers = question.answers;
		this.sendQuestion(question);
		this.setTallyTimeout();
	}

	setTallyTimeout() {
		this.setPhaseTimeout(() => this.tallyAnswers(), this.getRoundLength());
	}

	/**
	 * Broadcasts to the room what the next question is.
	 */
	sendQuestion(question: TriviaQuestion) {
		broadcast(
			this.room,
			this.room.tr`Question${this.game.length === 'infinite' ? ` ${this.questionNumber}` : ''}: ${question.question}`,
			this.room.tr`Category: ${ALL_CATEGORIES[question.category]}`
		);
	}

	/**
	 * This is a noop here since it'd defined properly by subclasses later on.
	 * All this is obligated to do is take a user and their answer as args;
	 * the behaviour of this method can be entirely arbitrary otherwise.
	 */
	answerQuestion(answer: string, user: User): string | void {}

	/**
	 * Verifies whether or not an answer is correct. In longer answers, small
	 * typos can be made and still have the answer be considered correct.
	 */
	verifyAnswer(targetAnswer: string) {
		return this.curAnswers.some(answer => {
			const mla = this.maxLevenshteinAllowed(answer.length);
			return (answer === targetAnswer) || (Utils.levenshtein(targetAnswer, answer, mla) <= mla);
		});
	}

	/**
	 * Return the maximum Levenshtein distance that is allowable for answers of the given length.
	 */
	maxLevenshteinAllowed(answerLength: number) {
		if (answerLength > 5) {
			return 2;
		}

		if (answerLength > 4) {
			return 1;
		}

		return 0;
	}
	/**
	 * This is a noop here since it'd defined properly by mode subclasses later
	 * on. This calculates the points a correct responder earns, which is
	 * typically between 1-5.
	 */
	calculatePoints(diff: number, totalDiff: number) {}

	/**
	 * This is a noop here since it's defined properly by mode subclasses later
	 * on. This is obligated to update the game phase, but it can be entirely
	 * arbitrary otherwise.
	 */
	tallyAnswers() {}

	/**
	 * Ends the game after a player's score has exceeded the score cap.
	 */
	win(buffer: string) {
		if (this.phaseTimeout) clearTimeout(this.phaseTimeout);
		this.phaseTimeout = null;
		const winners = this.getTopPlayers({max: 3});
		buffer += '<br />' + this.getWinningMessage(winners);
		broadcast(this.room, this.room.tr`The answering period has ended!`, buffer);

		for (const userid in this.playerTable) {
			const player = this.playerTable[userid];
			if (!player.points) continue;

			for (const leaderboard of [triviaData.leaderboard!, triviaData.altLeaderboard!]) {
				if (!leaderboard[userid]) {
					leaderboard[userid] = [0, 0, 0];
				}
				const rank = leaderboard[userid];
				rank[1] += player.points;
				rank[2] += player.correctAnswers;
			}
		}

		const prizes = this.getPrizes();
		triviaData.leaderboard![winners[0].id][0] += prizes[0];
		for (let i = 0; i < winners.length; i++) {
			triviaData.altLeaderboard![winners[i].id][0] += prizes[i];
		}

		cachedLadder.invalidateCache();
		cachedAltLadder.invalidateCache();

		for (const i in this.playerTable) {
			const player = this.playerTable[i];
			const user = Users.get(player.id);
			if (!user) continue;
			user.sendTo(
				this.room.roomid,
				this.room.tr`You gained ${player.points} and answered ` +
				this.room.tr`${player.correctAnswers} questions correctly.`
			);
		}

		const buf = this.getStaffEndMessage(winners, winner => winner.player.name);
		const logbuf = this.getStaffEndMessage(winners, winner => winner.id);
		this.room.sendMods(`(${buf}!)`);
		this.room.roomlog(buf);
		this.room.modlog({
			action: 'TRIVIAGAME',
			loggedBy: toID(this.game.creator),
			note: logbuf,
		});

		if (!triviaData.history) triviaData.history = [];
		triviaData.history.push(this.game);
		if (triviaData.history.length > 10) triviaData.history.shift();

		writeTriviaData();
		this.destroy();
	}

	getPrizes() {
		// Reward players more in longer infinite games
		const multiplier = this.game.length === 'infinite' ? Math.floor(this.questionNumber / 25) || 1 : 1;
		return LENGTHS[this.game.length].prizes.map(prize => prize * multiplier);
	}

	getTopPlayers(options: {max: number | null, requirePoints?: boolean} = {max: null, requirePoints: true}): TopPlayer[] {
		const ranks = [];
		for (const userid in this.playerTable) {
			const user = Users.get(userid);
			const player = this.playerTable[userid];
			if ((options.requirePoints && !player.points) || !user) continue;
			ranks.push({id: userid, player, name: user.name});
		}
		ranks.sort((a, b) => b.player.points - a.player.points ||
				a.player.lastQuestion - b.player.lastQuestion ||
				hrtimeToNanoseconds(a.player.answeredAt) - hrtimeToNanoseconds(b.player.answeredAt));
		return options.max === null ? ranks : ranks.slice(0, options.max);
	}

	getWinningMessage(winners: TopPlayer[]) {
		const prizes = this.getPrizes();
		const [p1, p2, p3] = winners;
		const initialPart = this.room.tr`${Utils.escapeHTML(p1.name)} won the game with a final score of <strong>${p1.player.points}</strong>, and `;
		switch (winners.length) {
		case 1:
			return this.room.tr`${initialPart}their leaderboard score has increased by <strong>${prizes[0]}</strong> points!`;
		case 2:
			return this.room.tr`${initialPart}their leaderboard score has increased by <strong>${prizes[0]}</strong> points! ` +
			this.room.tr`${Utils.escapeHTML(p2.name)} was a runner-up and their leaderboard score has increased by <strong>${prizes[1]}</strong> points!`;
		case 3:
			return initialPart + Utils.html`${this.room.tr`${p2.name} and ${p3.name} were runners-up. `}` +
				this.room.tr`Their leaderboard score has increased by ${prizes[0]}, ${prizes[1]}, and ${prizes[2]}, respectively!`;
		}
	}

	getStaffEndMessage(winners: TopPlayer[], mapper: (k: TopPlayer) => string) {
		let message = "";
		const winnerParts: ((k: TopPlayer) => string)[] = [
			winner => this.room.tr`User ${mapper(winner)} won the game of ${this.game.mode} ` +
				this.room.tr`mode trivia under the ${this.game.category} category with ` +
				`${this.getCap() ? this.room.tr`a cap of ${this.getCap()} points` : this.room.tr`no score cap`}, ` +
				this.room.tr`with ${winner.player.points} points and ` +
				this.room.tr`${winner.player.correctAnswers} correct answers`,
			winner => this.room.tr` Second place: ${mapper(winner)} (${winner.player.points} points)`,
			winner => this.room.tr`, third place: ${mapper(winner)} (${winner.player.points} points)`,
		];
		for (let i = 0; i < winners.length; i++) {
			message += winnerParts[i](winners[i]);
		}
		return `${message}`;
	}

	end(user: User) {
		broadcast(this.room, Utils.html`${this.room.tr`The game was forcibly ended by ${user.name}.`}`);
		this.destroy();
	}
}

/**
 * Helper function for timer and number modes. Milliseconds are not precise
 * enough to score players properly in rare cases.
 */
const hrtimeToNanoseconds = (hrtime: number[]) => hrtime[0] * 1e9 + hrtime[1];

/**
 * First mode rewards points to the first user to answer the question
 * correctly.
 */
export class FirstModeTrivia extends Trivia {
	answerQuestion(answer: string, user: User) {
		const player = this.playerTable[user.id];
		if (!player) throw new Chat.ErrorMessage(this.room.tr`You are not a player in the current trivia game.`);
		if (this.isPaused) throw new Chat.ErrorMessage(this.room.tr`The trivia game is paused.`);
		if (this.phase !== QUESTION_PHASE) throw new Chat.ErrorMessage(this.room.tr`There is no question to answer.`);
		if (player.answer) {
			throw new Chat.ErrorMessage(this.room.tr`You have already attempted to answer the current question.`);
		}
		if (!this.verifyAnswer(answer)) return;

		if (this.phaseTimeout) clearTimeout(this.phaseTimeout);
		this.phase = INTERMISSION_PHASE;

		const points = this.calculatePoints();
		player.setAnswer(answer);
		player.incrementPoints(points, this.questionNumber);

		const players = user.name;
		const buffer = Utils.html`${this.room.tr`Correct: ${players}`}<br />` +
			this.room.tr`Answer(s): ${this.curAnswers.join(', ')}` + `<br />` +
			this.room.tr`They gained <strong>5</strong> points!` + `<br />` +
			this.room.tr`The top 5 players are: ${this.formatPlayerList({max: 5})}`;
		if (this.getCap() && player.points >= this.getCap()) {
			this.win(buffer);
			return;
		}

		for (const i in this.playerTable) {
			this.playerTable[i].clearAnswer();
		}

		broadcast(this.room, this.room.tr`The answering period has ended!`, buffer);
		this.setAskTimeout();
	}

	calculatePoints() {
		return 5;
	}

	tallyAnswers() {
		if (this.isPaused) return;
		this.phase = INTERMISSION_PHASE;

		for (const i in this.playerTable) {
			const player = this.playerTable[i];
			player.clearAnswer();
		}

		broadcast(
			this.room,
			this.room.tr`The answering period has ended!`,
			this.room.tr`Correct: no one...` + `<br />` +
			this.room.tr`Answers: ${this.curAnswers.join(', ')}` + `<br />` +
			this.room.tr`Nobody gained any points.` + `<br />` +
			this.room.tr`The top 5 players are: ${this.formatPlayerList({max: 5})}`
		);
		this.setAskTimeout();
	}

	setAskTimeout() {
		this.setPhaseTimeout(() => this.askQuestion(), INTERMISSION_INTERVAL);
	}
}

/**
 * Timer mode rewards up to 5 points to all players who answer correctly
 * depending on how quickly they answer the question.
 */
export class TimerModeTrivia extends Trivia {
	answerQuestion(answer: string, user: User) {
		const player = this.playerTable[user.id];
		if (!player) throw new Chat.ErrorMessage(this.room.tr`You are not a player in the current trivia game.`);
		if (this.isPaused) throw new Chat.ErrorMessage(this.room.tr`The trivia game is paused.`);
		if (this.phase !== QUESTION_PHASE) throw new Chat.ErrorMessage(this.room.tr`There is no question to answer.`);

		const isCorrect = this.verifyAnswer(answer);
		player.setAnswer(answer, isCorrect);
	}

	/**
	 * The difference between the time the player answered the question and
	 * when the question was asked, in nanoseconds.
	 * The difference between the time scoring began and the time the question
	 * was asked, in nanoseconds.
	 */
	calculatePoints(diff: number, totalDiff: number) {
		return Math.floor(6 - 5 * diff / totalDiff);
	}

	tallyAnswers() {
		if (this.isPaused) return;
		this.phase = INTERMISSION_PHASE;

		let buffer = (
			this.room.tr`Answer(s): ${this.curAnswers.join(', ')}<br />` +
			'<table style="width: 100%; background-color: #9CBEDF; margin: 2px 0">' +
				'<tr style="background-color: #6688AA">' +
					'<th style="width: 100px">Points gained</th>' +
					`<th>${this.room.tr`Correct`}</th>` +
				'</tr>'
		);
		const innerBuffer: Map<number, [string, number][]> = new Map([5, 4, 3, 2, 1].map(n => [n, []]));

		let winner = false;

		const now = hrtimeToNanoseconds(process.hrtime());
		const askedAt = hrtimeToNanoseconds(this.askedAt);
		const totalDiff = now - askedAt;
		for (const i in this.playerTable) {
			const player = this.playerTable[i];
			if (!player.isCorrect) {
				player.clearAnswer();
				continue;
			}

			const playerAnsweredAt = hrtimeToNanoseconds(player.currentAnsweredAt);
			const diff = playerAnsweredAt - askedAt;
			const points = this.calculatePoints(diff, totalDiff);
			player.incrementPoints(points, this.questionNumber);

			const pointBuffer = innerBuffer.get(points) || [];
			pointBuffer.push([Utils.escapeHTML(player.name), playerAnsweredAt]);

			if (this.getCap() && player.points >= this.getCap()) {
				winner = true;
			}

			player.clearAnswer();
		}

		let rowAdded = false;
		for (const [pointValue, players] of innerBuffer) {
			if (!players.length) continue;

			rowAdded = true;
			const sanitizedPlayerArray = players
				.sort((a, b) => a[1] - b[1])
				.map(a => a[0]);
			buffer += (
				'<tr style="background-color: #6688AA">' +
				`<td style="text-align: center">${pointValue}</td>` +
				`<td>${sanitizedPlayerArray.join(', ')}</td>` +
				'</tr>'
			);
		}

		if (!rowAdded) {
			buffer += (
				'<tr style="background-color: #6688AA">' +
				'<td style="text-align: center">&#8212;</td>' +
				`<td>${this.room.tr`No one answered correctly...`}</td>` +
				'</tr>'
			);
		}

		buffer += '</table>';

		if (winner) return this.win(buffer);

		buffer += `<br />${this.room.tr`The top 5 players are: ${this.formatPlayerList({max: 5})}`}`;
		broadcast(this.room, this.room.tr`The answering period has ended!`, buffer);
		this.setPhaseTimeout(() => this.askQuestion(), INTERMISSION_INTERVAL);
	}
}

/**
 * Number mode rewards up to 5 points to all players who answer correctly
 * depending on the ratio of correct players to total players (lower ratio is
 * better).
 */
export class NumberModeTrivia extends Trivia {
	answerQuestion(answer: string, user: User) {
		const player = this.playerTable[user.id];
		if (!player) throw new Chat.ErrorMessage(this.room.tr`You are not a player in the current trivia game.`);
		if (this.isPaused) throw new Chat.ErrorMessage(this.room.tr`The trivia game is paused.`);
		if (this.phase !== QUESTION_PHASE) throw new Chat.ErrorMessage(this.room.tr`There is no question to answer.`);

		const isCorrect = this.verifyAnswer(answer);
		player.setAnswer(answer, isCorrect);
	}

	calculatePoints(correctPlayers: number) {
		return correctPlayers && (6 - Math.floor(5 * correctPlayers / this.playerCount));
	}

	getRoundLength() {
		return 6 * 1000;
	}

	tallyAnswers() {
		if (this.isPaused) return;
		this.phase = INTERMISSION_PHASE;

		let buffer;
		const innerBuffer = Object.keys(this.playerTable)
			.filter(id => !!this.playerTable[id].isCorrect)
			.map(id => {
				const player = this.playerTable[id];
				return [Utils.escapeHTML(player.name), hrtimeToNanoseconds(player.currentAnsweredAt)];
			})
			.sort((a, b) => (a[1] as number) - (b[1] as number));

		const points = this.calculatePoints(innerBuffer.length);
		if (points) {
			let winner = false;
			for (const i in this.playerTable) {
				const player = this.playerTable[i];
				if (player.isCorrect) player.incrementPoints(points, this.questionNumber);

				if (this.getCap() && player.points >= this.getCap()) {
					winner = true;
				}

				player.clearAnswer();
			}

			const players = innerBuffer.map(arr => arr[0]).join(', ');
			buffer = this.room.tr`Correct: ${players}` + `<br />` +
				this.room.tr`Answer(s): ${this.curAnswers.join(', ')}<br />` +
				`${Chat.plural(innerBuffer, this.room.tr`Each of them gained <strong>${points}</strong> point(s)!`, this.room.tr`They gained <strong>${points}</strong> point(s)!`)}`;

			if (winner) return this.win(buffer);
		} else {
			for (const i in this.playerTable) {
				const player = this.playerTable[i];
				player.clearAnswer();
			}

			buffer = this.room.tr`Correct: no one...` + `<br />` +
				this.room.tr`Answer(s): ${this.curAnswers.join(', ')}<br />` +
				this.room.tr`Nobody gained any points.`;
		}

		buffer += `<br />${this.room.tr`The top 5 players are: ${this.formatPlayerList({max: 5})}`}`;
		broadcast(this.room, this.room.tr`The answering period has ended!`, buffer);
		this.setPhaseTimeout(() => this.askQuestion(), INTERMISSION_INTERVAL);
	}
}

/**
 * Triumvirate mode rewards points to the top three users to answer the question correctly.
 */
export class TriumvirateModeTrivia extends Trivia {
	answerQuestion(answer: string, user: User) {
		const player = this.playerTable[user.id];
		if (!player) throw new Chat.ErrorMessage(this.room.tr`You are not a player in the current trivia game.`);
		if (this.isPaused) throw new Chat.ErrorMessage(this.room.tr`The trivia game is paused.`);
		if (this.phase !== QUESTION_PHASE) throw new Chat.ErrorMessage(this.room.tr`There is no question to answer.`);
		player.setAnswer(answer, this.verifyAnswer(answer));
		const correctAnswers = Object.keys(this.playerTable).filter(id => this.playerTable[id].isCorrect).length;
		if (correctAnswers === 3) {
			if (this.phaseTimeout) clearTimeout(this.phaseTimeout);
			this.tallyAnswers();
		}
	}

	calculatePoints(answerNumber: number) {
		return 5 - answerNumber * 2; // 5 points to 1st, 3 points to 2nd, 1 point to 1st
	}

	tallyAnswers() {
		if (this.isPaused) return;
		this.phase = INTERMISSION_PHASE;
		const correctPlayers = Object.keys(this.playerTable)
			.filter(id => this.playerTable[id].isCorrect)
			.map(id => this.playerTable[id]);
		correctPlayers.sort((a, b) =>
			(hrtimeToNanoseconds(a.currentAnsweredAt) > hrtimeToNanoseconds(b.currentAnsweredAt) ? 1 : -1));

		let winner = false;
		const playersWithPoints = [];
		for (const player of correctPlayers) {
			const points = this.calculatePoints(correctPlayers.indexOf(player));
			player.incrementPoints(points, this.questionNumber);
			playersWithPoints.push(`${Utils.escapeHTML(player.name)} (${points})`);
			if (this.getCap() && player.points >= this.getCap()) {
				winner = true;
			}
		}
		for (const i in this.playerTable) {
			this.playerTable[i].clearAnswer();
		}

		let buffer = ``;
		if (playersWithPoints.length) {
			const players = playersWithPoints.join(", ");
			buffer = this.room.tr`Correct: ${players}<br />` +
			this.room.tr`Answers: ${this.curAnswers.join(', ')}<br />` +
			this.room.tr`The top 5 players are: ${this.formatPlayerList({max: 5})}`;
		} else {
			buffer = this.room.tr`Correct: no one...` + `<br />` +
			this.room.tr`Answers: ${this.curAnswers.join(', ')}<br />` +
			this.room.tr`Nobody gained any points.` + `<br />` +
			this.room.tr`The top 5 players are: ${this.formatPlayerList({max: 5})}`;
		}

		if (winner) return this.win(buffer);
		broadcast(this.room, this.room.tr`The answering period has ended!`, buffer);
		this.setPhaseTimeout(() => this.askQuestion(), INTERMISSION_INTERVAL);
	}
}

/**
 * Mastermind is a separate, albeit similar, game from regular Trivia.
 *
 * In Mastermind, each player plays their own personal round of Trivia,
 * and the top n players from those personal rounds go on to the finals,
 * which is a game of First mode trivia that ends after a specified interval.
 */
export class Mastermind extends Rooms.RoomGame {
	/** userid:score Map */
	leaderboard: Map<ID, number>;
	phase: string;
	currentRound: MastermindRound | MastermindFinals | null;
	numFinalists: number;

	constructor(room: Room, numFinalists: number) {
		super(room);

		this.leaderboard = new Map<ID, number>();
		this.gameid = 'mastermind' as ID;
		this.title = 'Mastermind';
		this.allowRenames = true;
		this.playerCap = Number.MAX_SAFE_INTEGER;
		this.phase = SIGNUP_PHASE;
		this.currentRound = null;
		this.numFinalists = numFinalists;
		this.init();
	}

	init() {
		broadcast(
			this.room,
			this.room.tr`Signups for a new Mastermind game have begun!`,
			this.room.tr`The top <strong>${this.numFinalists}</strong> players will advance to the finals!` + `<br />` +
			this.room.tr`Type <code>/mastermind join</code> to sign up for the game.`
		);
	}

	addTriviaPlayer(user: User) {
		if (user.previousIDs.concat(user.id).some(id => id in this.playerTable)) {
			throw new Chat.ErrorMessage(this.room.tr`You have already signed up for this game.`);
		}

		for (const targetUser of Object.keys(this.playerTable).map(id => Users.get(id))) {
			if (!targetUser) continue;
			const isSameUser = (
				targetUser.previousIDs.includes(user.id) ||
				targetUser.previousIDs.some(tarId => user.previousIDs.includes(tarId)) ||
				!Config.noipchecks && targetUser.ips.some(ip => user.ips.includes(ip))
			);
			if (isSameUser) throw new Chat.ErrorMessage(this.room.tr`You have already signed up for this game.`);
		}

		this.addPlayer(user);
	}

	formatPlayerList() {
		return Object.values(this.playerTable)
			.sort((a, b) => (this.leaderboard.get(b.id) || 0) - (this.leaderboard.get(a.id) || 0))
			.map(player => {
				const isFinalist = this.currentRound instanceof MastermindFinals && player.id in this.currentRound.playerTable;
				const name = isFinalist ? Utils.html`<strong>${player.name}</strong>` : Utils.escapeHTML(player.name);
				return `${name} (${this.leaderboard.get(player.id) || "0"})`;
			})
			.join(', ');
	}

	/**
	 * Starts a new round for a particular player.
	 * @param playerID the user ID of the player
	 * @param category the category to ask questions in (e.g. Pokémon)
	 * @param questions an array of TriviaQuestions to be asked
	 * @param timeout the period of time to end the round after (in seconds)
	 */
	startRound(playerID: ID, category: string, questions: TriviaQuestion[], timeout: number) {
		if (this.currentRound) {
			throw new Chat.ErrorMessage(this.room.tr`There is already a round of Mastermind in progress.`);
		}
		if (!(playerID in this.playerTable)) {
			throw new Chat.ErrorMessage(this.room.tr`That user is not signed up for Mastermind!`);
		}
		if (this.leaderboard.has(playerID)) {
			throw new Chat.ErrorMessage(this.room.tr`The user "${playerID}" has already played their round of Mastermind.`);
		}
		if (this.playerCount <= this.numFinalists) {
			throw new Chat.ErrorMessage(this.room.tr`You cannot start the game of Mastermind until there are more players than finals slots.`);
		}

		this.phase = MASTERMIND_ROUNDS_PHASE;

		this.currentRound = new MastermindRound(this.room, category, questions, playerID);
		setTimeout((id) => {
			if (!this.currentRound) return;
			const points = this.currentRound.playerTable[playerID]?.points;
			const player = this.playerTable[id].name;
			broadcast(
				this.room,
				this.room.tr`The round of Mastermind has ended!`,
				points ? this.room.tr`${player} earned ${points} points!` : undefined
			);

			this.leaderboard.set(id, points || 0);
			this.currentRound.destroy();
			this.currentRound = null;
		}, timeout * 1000, playerID);
	}

	/**
	 * Starts the Mastermind finals.
	 * According the specification given by Trivia auth,
	 * Mastermind finals are always in the 'all' category.
	 * @param timeout timeout in seconds
	 */
	startFinals(timeout: number) {
		if (this.currentRound) {
			throw new Chat.ErrorMessage(this.room.tr`There is already a round of Mastermind in progress.`);
		}
		for (const player in this.playerTable) {
			if (!this.leaderboard.has(toID(player))) {
				throw new Chat.ErrorMessage(this.room.tr`You cannot start finals until the user '${player}' has played a round.`);
			}
		}

		const questions = Utils.shuffle(getQuestions('all' as ID));
		if (!questions.length) throw new Chat.ErrorMessage(this.room.tr`There are no questions in the Trivia database.`);

		this.currentRound = new MastermindFinals(this.room, 'all', questions, this.getTopPlayers(this.numFinalists));

		this.phase = MASTERMIND_FINALS_PHASE;
		setTimeout(() => {
			if (!this.currentRound) return;
			this.currentRound.win();
			const [winner, second, third] = this.currentRound.getTopPlayers();
			this.currentRound.destroy();
			this.currentRound = null;

			let buf = this.room.tr`No one scored any points, so it's a tie!`;
			if (winner) {
				const winnerName = Utils.escapeHTML(winner.name);
				buf = this.room.tr`${winnerName} won the game of Mastermind with ${winner.player.points} points!`;
			}

			let smallBuf;
			if (second && third) {
				const secondPlace = Utils.escapeHTML(second.name);
				const thirdPlace = Utils.escapeHTML(second.name);
				smallBuf = `<br />${this.room.tr`${secondPlace} and ${thirdPlace} were runners-up with ${second.player.points} and ${third.player.points} points, respectively.`}`;
			} else if (second) {
				const secondPlace = Utils.escapeHTML(second.name);
				smallBuf = `<br />${this.room.tr`${secondPlace} was a runner up with ${second.player.points} points.`}`;
			}

			broadcast(this.room, buf, smallBuf);
			this.destroy();
		}, timeout * 1000);
	}

	/**
	 * NOT guaranteed to return an array of length n.
	 *
	 * See the Trivia auth discord: https://discord.com/channels/280211330307194880/444675649731428352/788204647402831913
	 */
	getTopPlayers(n: number) {
		if (n < 0) return [];

		const sortedPlayerIDs = [...this.leaderboard]
			.sort((a, b) => b[1] - a[1]) // sort by number of points
			.map(entry => entry[0]); // convert to an array of IDs

		const cutoff = this.leaderboard.get(sortedPlayerIDs[n - 1])!; // The number of points required to be in the top n
		return sortedPlayerIDs.filter(id => this.leaderboard.get(id)! >= cutoff);
	}

	end(user: User) {
		broadcast(this.room, this.room.tr`The game of Mastermind was forcibly ended by ${user.name}.`);
		if (this.currentRound) this.currentRound.destroy();
		this.destroy();
	}

	leave(user: User) {
		if (!this.playerTable[user.id]) {
			throw new Chat.ErrorMessage(this.room.tr`You are not a player in the current game.`);
		}
		this.leaderboard.delete(user.id);
		super.removePlayer(user);
	}

	kick(toKick: User, kicker: User) {
		if (!this.playerTable[toKick.id]) {
			throw new Chat.ErrorMessage(this.room.tr`User ${toKick.name} is not a player in the game.`);
		}

		if (this.numFinalists > (this.players.length - 1)) {
			throw new Chat.ErrorMessage(
				this.room.tr`Kicking ${toKick.name} would leave this game of Mastermind without enough players to reach ${this.numFinalists} finalists.`
			);
		}

		this.leaderboard.delete(toKick.id);

		if (this.currentRound?.playerTable[toKick.id]) {
			if (this.currentRound instanceof MastermindFinals) {
				this.currentRound.kick(toKick);
			} else /* it's a regular round */ {
				this.currentRound.end(kicker);
			}
		}

		super.removePlayer(toKick);
	}
}

export class MastermindRound extends FirstModeTrivia {
	constructor(room: Room, category: string, questions: TriviaQuestion[], playerID?: ID) {
		super(room, 'first', category, 'infinite', questions, 'Automatically Created', false, true);

		this.playerCap = 1;
		this.minPlayers = 0;
		if (playerID) {
			const player = Users.get(playerID);
			const targetUsername = playerID;
			if (!player) throw new Chat.ErrorMessage(this.room.tr`User "${targetUsername}" not found.`);
			this.addPlayer(player);
		}
		this.game.mode = 'Mastermind';
		this.start();
	}

	init() {
		return;
	}
	start(): string | undefined {
		const player = Object.values(this.playerTable)[0];
		const name = Utils.escapeHTML(player.name);
		broadcast(this.room, this.room.tr`A Mastermind round in the ${this.game.category} category for ${name} is starting!`);
		player.sendRoom(
			`|tempnotify|mastermind|Your Mastermind round is starting|Your round of Mastermind is starting in the Trivia room.`
		);

		this.phase = INTERMISSION_PHASE;
		this.setPhaseTimeout(() => this.askQuestion(), MASTERMIND_INTERMISSION_INTERVAL);
		return;
	}

	win() {
		if (this.phaseTimeout) clearTimeout(this.phaseTimeout);
		this.phaseTimeout = null;
	}

	addTriviaPlayer(user: User): string | undefined {
		throw new Chat.ErrorMessage(`This is a round of Mastermind; to join the overall game of Mastermind, use /mm join`);
	}

	setTallyTimeout() {
		// Players must use /mastermind pass to pass on a question
		return;
	}

	pass() {
		this.tallyAnswers();
	}

	setAskTimeout() {
		this.setPhaseTimeout(() => this.askQuestion(), MASTERMIND_INTERMISSION_INTERVAL);
	}

	destroy() {
		super.destroy();
	}
}

export class MastermindFinals extends MastermindRound {
	constructor(room: Room, category: string, questions: TriviaQuestion[], players: ID[]) {
		super(room, category, questions);
		this.playerCap = players.length;
		for (const id of players) {
			const player = Users.get(id);
			if (!player) continue;
			this.addPlayer(player);
		}
	}

	start(): string | undefined {
		broadcast(this.room, this.room.tr`The Mastermind finals are starting!`);
		this.phase = INTERMISSION_PHASE;
		// Use the regular start timeout since there are many players
		this.setPhaseTimeout(() => this.askQuestion(), MASTERMIND_FINALS_START_TIMEOUT);
		return;
	}

	win() {
		super.win();
		const points = new Map<string, number>();
		for (const id in this.playerTable) {
			points.set(id, this.playerTable[id].points);
		}
		return points;
	}

	setTallyTimeout = FirstModeTrivia.prototype.setTallyTimeout;

	pass() {
		throw new Chat.ErrorMessage(this.room.tr`You cannot pass in the finals.`);
	}
}

const triviaCommands: ChatCommands = {
	sortednew: 'new',
	newsorted: 'new',
	new(target, room, user, connection, cmd) {
		const randomizeQuestionOrder = !cmd.includes('sorted');

		room = this.requireRoom('trivia' as RoomID);
		this.checkCan('show', null, room);
		this.checkChat();
		if (room.game) {
			return this.errorReply(this.tr`There is already a game of ${room.game.title} in progress.`);
		}

		const targets = (target ? target.split(',') : []);
		if (targets.length < 3) return this.errorReply("Usage: /trivia new [mode], [category], [length]");

		let mode: string = toID(targets[0]);
		if (['triforce', 'tri'].includes(mode)) mode = 'triumvirate';
		const isRandomMode = (mode === 'random');
		if (isRandomMode) {
			const recentFirstMode = triviaData.history?.some(game => game.mode === 'First');
			const modes = recentFirstMode ? Object.keys(MODES).filter(curMode => curMode !== 'first') : Object.keys(MODES);
			mode = Utils.shuffle(modes)[0];
		}
		if (!MODES[mode]) return this.errorReply(this.tr`"${mode}" is an invalid mode.`);

		const categoryID = toID(targets[1]);
		const category = CATEGORY_ALIASES[categoryID] || categoryID;
		let questions = getQuestions(category);
		const length = toID(targets[2]);
		if (!LENGTHS[length]) return this.errorReply(this.tr`"${length}" is an invalid game length.`);
		// Assume that infinite mode will last for at least 75 points
		if (questions.length < (LENGTHS[length].cap || 75) / 5) {
			if (category === 'random') {
				return this.errorReply(
					this.tr`There are not enough questions in the randomly chosen category to finish a trivia game.`
				);
			}
			if (category === 'all') {
				return this.errorReply(
					this.tr`There are not enough questions in the trivia database to finish a trivia game.`
				);
			}
			return this.errorReply(
				this.tr`There are not enough questions under the category "${ALL_CATEGORIES[category]}" to finish a trivia game.`
			);
		}

		let _Trivia;
		if (mode === 'first') {
			_Trivia = FirstModeTrivia;
		} else if (mode === 'number') {
			_Trivia = NumberModeTrivia;
		} else if (mode === 'triumvirate') {
			_Trivia = TriumvirateModeTrivia;
		} else {
			_Trivia = TimerModeTrivia;
		}

		if (randomizeQuestionOrder) {
			// Randomizes the order of the questions.
			questions = Utils.shuffle(questions);
		} else {
			// Reverses the order of the questions so that they appear
			// in the order they were added to the Trivia question "database".
			questions = questions.reverse();
		}
		room.game = new _Trivia(room, mode, category, length, questions, user.name, isRandomMode);
	},
	newhelp: [
		`/trivia new [mode], [category], [length] - Begin a new Trivia game.`,
		`/trivia sortednew [mode], [category], [length] — Begin a new Trivia game in which the question order is not randomized.`,
		`Requires: + % @ # &`,
	],

	join(target, room, user) {
		room = this.requireRoom();
		getTriviaGame(room).addTriviaPlayer(user);
		this.sendReply(this.tr`You are now signed up for this game!`);
	},
	joinhelp: [`/trivia join - Join the current game of Trivia or Mastermind.`],

	kick(target, room, user) {
		room = this.requireRoom();
		this.checkChat();
		this.checkCan('mute', null, room);

		this.splitTarget(target);
		const targetUser = this.targetUser;
		if (!targetUser) return this.errorReply(this.tr`The user "${target}" does not exist.`);
		getTriviaOrMastermindGame(room).kick(targetUser, user);
	},
	kickhelp: [`/trivia kick [username] - Kick players from a trivia game by username. Requires: % @ # &`],

	leave(target, room, user) {
		getTriviaGame(room).leave(user);
		this.sendReply(this.tr`You have left the current game of Trivia.`);
	},
	leavehelp: [`/trivia leave - Makes the player leave the game.`],

	start(target, room) {
		room = this.requireRoom();
		this.checkCan('show', null, room);
		this.checkChat();

		getTriviaGame(room).start();
	},
	starthelp: [`/trivia start - Ends the signup phase of a trivia game and begins the game. Requires: + % @ # &`],

	answer(target, room, user) {
		room = this.requireRoom();
		this.checkChat();
		let game: Trivia | MastermindRound | MastermindFinals;
		try {
			const mastermindRound = getMastermindGame(room).currentRound;
			if (!mastermindRound) throw new Error;
			game = mastermindRound;
		} catch (e) {
			game = getTriviaGame(room);
		}

		const answer = toID(target);
		if (!answer) return this.errorReply(this.tr`No valid answer was entered.`);

		if (room.game?.gameid === 'trivia' && !Object.keys(game.playerTable).includes(user.id)) {
			game.addTriviaPlayer(user);
		}
		game.answerQuestion(answer, user);
		this.sendReply(this.tr`You have selected "${answer}" as your answer.`);
	},
	answerhelp: [`/trivia answer OR /ta [answer] - Answer a pending question.`],

	resume: 'pause',
	pause(target, room, user, connection, cmd) {
		room = this.requireRoom();
		this.checkCan('show', null, room);
		this.checkChat();
		if (cmd === 'pause') {
			getTriviaGame(room).pause();
		} else {
			getTriviaGame(room).resume();
		}
	},
	pausehelp: [`/trivia pause - Pauses a trivia game. Requires: + % @ # &`],
	resumehelp: [`/trivia resume - Resumes a paused trivia game. Requires: + % @ # &`],

	end(target, room, user) {
		room = this.requireRoom();
		this.checkCan('show', null, room);
		this.checkChat();

		getTriviaOrMastermindGame(room).end(user);
	},
	endhelp: [`/trivia end - Forcibly end a trivia game. Requires: + % @ # &`],

	getwinners: 'win',
	win(target, room, user) {
		room = this.requireRoom();
		this.checkCan('show', null, room);
		this.checkChat();

		const game = getTriviaGame(room);
		if (game.game.length !== 'infinite' && !user.can('editroom', null, room)) {
			return this.errorReply(
				this.tr`Only Room Owners and higher can force a Trivia game to end with winners in a non-infinite length.`
			);
		}
		game.win(this.tr`${user.name} ended the game of Trivia!`);
	},
	winhelp: [`/trivia win - End a trivia game and tally the points to find winners. Requires: + % @ # & in Infinite length, else # &`],

	'': 'status',
	players: 'status',
	status(target, room, user) {
		room = this.requireRoom();
		if (!this.runBroadcast()) return false;
		const game = getTriviaGame(room);

		let tarUser;
		if (target) {
			this.splitTarget(target);
			if (!this.targetUser) return this.errorReply(this.tr`User ${target} does not exist.`);
			tarUser = this.targetUser;
		} else {
			tarUser = user;
		}
		let buffer = `${game.isPaused ? this.tr`There is a paused trivia game` : this.tr`There is a trivia game in progress`}, ` +
			this.tr`and it is in its ${game.phase} phase.` + `<br />` +
			this.tr`Mode: ${game.game.mode} | Category: ${game.game.category} | Score cap: ${game.getCap() || "Infinite"}`;

		const player = game.playerTable[tarUser.id];
		if (player) {
			if (!this.broadcasting) {
				buffer += `<br />${this.tr`Current score: ${player.points} | Correct Answers: ${player.correctAnswers}`}`;
			}
		} else if (tarUser.id !== user.id) {
			return this.errorReply(this.tr`User ${tarUser.name} is not a player in the current trivia game.`);
		}
		buffer += `<br />${this.tr`Players: ${game.formatPlayerList({max: null, requirePoints: false})}`}`;

		this.sendReplyBox(buffer);
	},
	statushelp: [`/trivia status [player] - lists the player's standings (your own if no player is specified) and the list of players in the current trivia game.`],

	submit: 'add',
	add(target, room, user, connection, cmd) {
		room = this.requireRoom('questionworkshop' as RoomID);
		if (cmd === 'add') this.checkCan('mute', null, room);
		if (cmd === 'submit') this.checkCan('show', null, room);
		if (!target) return false;
		this.checkChat();

		const params = target.split('\n').map(str => str.split('|'));
		for (const param of params) {
			if (param.length !== 3) {
				this.errorReply(this.tr`Invalid arguments specified in "${param}". View /trivia help for more information.`);
				continue;
			}

			const categoryID = toID(param[0]);
			const category = CATEGORY_ALIASES[categoryID] || categoryID;
			if (!ALL_CATEGORIES[category]) {
				this.errorReply(this.tr`'${param[0].trim()}' is not a valid category. View /trivia help for more information.`);
				continue;
			}
			if (cmd === 'submit' && !MAIN_CATEGORIES[category]) {
				this.errorReply(this.tr`You cannot submit questions in the '${ALL_CATEGORIES[category]}' category`);
				continue;
			}

			const question = Utils.escapeHTML(param[1].trim());
			if (!question) {
				this.errorReply(this.tr`'${param[1].trim()}' is not a valid question.`);
				continue;
			}
			if (question.length > MAX_QUESTION_LENGTH) {
				this.errorReply(
					this.tr`Question "${param[1].trim()}" is too long! It must remain under ${MAX_QUESTION_LENGTH} characters.`
				);
				continue;
			}

			if (
				triviaData.questions![category]?.some(q => q.question === question) ||
				triviaData.submissions![category]?.some(q => q.question === question)
			) {
				this.errorReply(this.tr`Question "${question}" is already awaiting review.`);
				continue;
			}

			const cache = new Set();
			const answers = param[2].split(',')
				.map(toID)
				.filter(answer => !cache.has(answer) && !!cache.add(answer));
			if (!answers.length) {
				this.errorReply(this.tr`No valid answers were specified for question '${param[1].trim()}'.`);
				continue;
			}
			if (answers.some(answer => answer.length > MAX_ANSWER_LENGTH)) {
				this.errorReply(
					this.tr`Some of the answers entered for question '${param[1].trim()}' were too long!\n` +
					`They must remain under ${MAX_ANSWER_LENGTH} characters.`
				);
				continue;
			}

			const entry = {
				category: category,
				question: question,
				answers: answers,
				user: user.id,
			};

			if (cmd === 'add') {
				if (!triviaData.questions![category]) triviaData.questions![category] = [];
				triviaData.questions![category].push(entry);
				writeTriviaData();
				this.modlog('TRIVIAQUESTION', null, `added '${param[1]}'`);
				this.privateModAction(`Question '${param[1]}' was added to the question database by ${user.name}.`);
			} else {
				if (!triviaData.submissions![category]) triviaData.submissions![category] = [];
				triviaData.submissions![category].push(entry);
				writeTriviaData();
				if (!user.can('mute', null, room)) this.sendReply(`Question '${param[1]}' was submitted for review.`);
				this.modlog('TRIVIAQUESTION', null, `submitted '${param[1]}'`);
				this.privateModAction(`Question '${param[1]}' was submitted to the submission database by ${user.name} for review.`);
			}
		}
	},
	submithelp: [`/trivia submit [category] | [question] | [answer1], [answer2] ... [answern] - Adds question(s) to the submission database for staff to review. Requires: + % @ # &`],
	addhelp: [`/trivia add [category] | [question] | [answer1], [answer2], ... [answern] - Adds question(s) to the question database. Requires: % @ # &`],

	review(target, room) {
		room = this.requireRoom('questionworkshop' as RoomID);
		this.checkCan('ban', null, room);

		const submissions = triviaData.submissions;
		if (!submissions) return this.sendReply(this.tr`No questions await review.`);

		let innerBuffer = '';
		let total = 0;
		for (const category in submissions) {
			for (const [i, entry] of submissions[category].entries()) {
				total++;
				innerBuffer += `<tr><td><strong>${i + 1}</strong></td><td>${entry.category}</td><td>${entry.question}</td><td>${entry.answers.join(", ")}</td><td>${entry.user}</td></tr>`;
			}
		}
		if (!innerBuffer) return this.sendReply(this.tr`No questions await review.`);

		const buffer = `|raw|<div class="ladder"><table>` +
			`<tr><td colspan="6"><strong>${Chat.count(total, "</strong> questions")} awaiting review:</td></tr>` +
			`<tr><th>#</th><th>${this.tr`Category`}</th><th>${this.tr`Question`}</th><th>${this.tr`Answer(s)`}</th><th>${this.tr`Submitted By`}</th></tr>` +
			innerBuffer +
			`</table></div>`;

		this.sendReply(buffer);
	},
	reviewhelp: [`/trivia review - View the list of submitted questions. Requires: @ # &`],

	reject: 'accept',
	accept(target, room, user, connection, cmd) {
		room = this.requireRoom('questionworkshop' as RoomID);
		this.checkCan('ban', null, room);
		this.checkChat();

		target = target.trim();
		if (!target) return false;

		const isAccepting = cmd === 'accept';
		const questions = triviaData.questions!;
		const submissions = triviaData.submissions!;

		if (toID(target) === 'all') {
			if (isAccepting) {
				for (const category in submissions) {
					questions[category].push(...submissions[category]);
				}
			}

			triviaData.submissions = {};
			writeTriviaData();
			this.modlog(`TRIVIAQUESTION`, null, `${(isAccepting ? "added" : "removed")} all from submission database.`);
			return this.privateModAction(`${user.name} ${(isAccepting ? " added " : " removed ")} all questions from the submission database.`);
		}

		if (/\d+(?:-\d+)?(?:, ?\d+(?:-\d+)?)*$/.test(target)) {
			let indices = target.split(',');
			const category = toID(indices.shift());
			if (!submissions[category]) {
				throw new Chat.ErrorMessage(`There are no submissions to the ${category} category.`);
			}

			// Parse number ranges and add them to the list of indices,
			// then remove them in addition to entries that aren't valid index numbers
			for (let i = indices.length; i--;) {
				if (!indices[i].includes('-')) {
					const index = Number(indices[i]);
					if (Number.isInteger(index) && index > 0 && index <= submissions[category].length) {
						indices[i] = String(index);
					} else {
						indices.splice(i, 1);
					}
					continue;
				}

				const range = indices[i].split('-');
				const left = Number(range[0]);
				let right = Number(range[1]);
				if (!Number.isInteger(left) || !Number.isInteger(right) ||
					left < 1 || right > submissions[category].length || left === right) {
					indices.splice(i, 1);
					continue;
				}

				do {
					indices.push(String(right));
				} while (--right >= left);

				indices.splice(i, 1);
			}

			indices.sort((a, b) => Number(a) - Number(b));
			indices = indices.filter((entry, index) => !index || indices[index - 1] !== entry);

			const indicesLen = indices.length;
			if (!indicesLen) {
				return this.errorReply(
					this.tr`'${target}' is not a valid set of submission index numbers.\n` +
					this.tr`View /trivia review and /trivia help for more information.`
				);
			}

			if (isAccepting) {
				for (let i = indicesLen; i--;) {
					const submission = submissions[category].splice(Number(indices[i]) - 1, 1)[0];
					questions[category].push(submission);
				}
			} else {
				for (let i = indicesLen; i--;) {
					submissions[category].splice(Number(indices[i]) - 1, 1);
				}
			}

			writeTriviaData();
			this.modlog('TRIVIAQUESTION', null, `${(isAccepting ? "added " : "removed ")}submission number${(indicesLen > 1 ? "s " : " ")}${target}`);
			return this.privateModAction(`${user.name} ${(isAccepting ? "added " : "removed ")}submission number${(indicesLen > 1 ? "s " : " ")}${target} from the submission database.`);
		}

		this.errorReply(this.tr`'${target}' is an invalid argument. View /trivia help questions for more information.`);
	},
	accepthelp: [`/trivia accept [category], [index1], [index2], ... [indexn] OR all - Add questions from the submission database to the question database using their index numbers or ranges of them. Requires: @ # &`],
	rejecthelp: [`/trivia reject [category], [index1], [index2], ... [indexn] OR all - Remove questions from the submission database using their index numbers or ranges of them. Requires: @ # &`],

	delete(target, room, user) {
		room = this.requireRoom('questionworkshop' as RoomID);
		this.checkCan('mute', null, room);
		this.checkChat();

		target = target.trim();
		if (!target) return false;

		const question = Utils.escapeHTML(target);
		if (!question) {
			return this.errorReply(this.tr`'${target}' is not a valid argument. View /trivia help questions for more information.`);
		}

		const questionID = toID(question);
		for (const category in triviaData.questions!) {
			for (const [i, questionObj] of triviaData.questions[category].entries()) {
				if (toID(questionObj.question) === questionID) {
					triviaData.questions[category].splice(i, 1);
					writeTriviaData();
					this.modlog('TRIVIAQUESTION', null, `removed '${target}'`);
					return this.privateModAction(room.tr`${user.name} removed question '${target}' from the question database.`);
				}
			}
		}

		this.errorReply(this.tr`Question '${target}' was not found in the question database.`);
	},
	deletehelp: [`/trivia delete [question] - Delete a question from the trivia database. Requires: % @ # &`],

	move(target, room, user) {
		room = this.requireRoom('questionworkshop' as RoomID);
		this.checkCan('mute', null, room);
		this.checkChat();

		target = target.trim();
		if (!target) return false;

		const params = target.split('\n').map(str => str.split('|'));
		for (const param of params) {
			if (param.length !== 2) {
				this.errorReply(this.tr`Invalid arguments specified in "${param}". View /trivia help for more information.`);
				continue;
			}

			const categoryID = toID(param[0]);
			const category = CATEGORY_ALIASES[categoryID] || categoryID;
			if (!ALL_CATEGORIES[category]) {
				this.errorReply(this.tr`'${param[0].trim()}' is not a valid category. View /trivia help for more information.`);
				continue;
			}

			const questionID = toID(Utils.escapeHTML(param[1].trim()));
			if (!questionID) {
				this.errorReply(this.tr`'${param[1].trim()}' is not a valid question.`);
				continue;
			}

			for (const cat in triviaData.questions!) {
				const index = triviaData.questions[cat].findIndex(q => toID(q.question) === questionID);
				if (index !== -1 && cat !== categoryID) {
					const question = triviaData.questions[cat][index];
					question.category = categoryID;
					triviaData.questions[categoryID].push(question);
					triviaData.questions[cat].splice(index, 1);

					writeTriviaData();
					this.modlog('TRIVIAQUESTION', null, `changed category for '${param[1].trim()}' to '${param[0]}'`);
					return this.privateModAction(
						this.tr`${user.name} changed question category to '${param[0]}' for '${param[1].trim()}' ` +
						this.tr`from the question database.`
					);
				}
			}
		}
	},
	movehelp: [
		`/trivia move [category] | [question] - Change the category of question in the trivia database. Requires: % @ # &`,
	],

	qs(target, room, user) {
		room = this.requireRoom('questionworkshop' as RoomID);

		let buffer = "|raw|<div class=\"ladder\" style=\"overflow-y: scroll; max-height: 300px;\"><table>";
		if (!target) {
			if (!this.runBroadcast()) return false;

			const questions = triviaData.questions!;
			const totalQuestions = Object.values(questions).map(qs => qs.length).reduce((total, length) => total + length);

			if (!totalQuestions) return this.sendReplyBox(this.tr`No questions have been submitted yet.`);

			buffer += `<tr><th>Category</th><th>${this.tr`Question Count`}</th></tr>`;
			for (const category in ALL_CATEGORIES) {
				if (category === 'random') continue;
				const tally = questions[category]?.length || 0;
				buffer += `<tr><td>${ALL_CATEGORIES[category]}</td><td>${tally} (${((tally * 100) / totalQuestions).toFixed(2)}%)</td></tr>`;
			}
			buffer += `<tr><td><strong>${this.tr`Total`}</strong></td><td><strong>${totalQuestions}</strong></td></table></div>`;

			return this.sendReply(buffer);
		}

		this.checkCan('mute', null, room);

		target = toID(target);
		const category = CATEGORY_ALIASES[target] || target;
		if (category === 'random') return false;
		if (!ALL_CATEGORIES[category]) {
			return this.errorReply(this.tr`'${target}' is not a valid category. View /help trivia for more information.`);
		}

		const list = triviaData.questions![category];
		if (!list.length) {
			buffer += `<tr><td>${this.tr`There are no questions in the ${ALL_CATEGORIES[category]} category.`}</td></table></div>`;
			return this.sendReply(buffer);
		}

		if (user.can('ban', null, room)) {
			const cat = ALL_CATEGORIES[category];
			buffer += `<tr><td colspan="3">${this.tr`There are <strong>${list.length}</strong> questions in the ${cat} category.`}</td></tr>` +
				`<tr><th>#</th><th>${this.tr`Question`}</th><th>${this.tr`Answer(s)`}</th></tr>`;
			for (const [i, entry] of list.entries()) {
				buffer += `<tr><td><strong>${(i + 1)}</strong></td><td>${entry.question}</td><td>${entry.answers.join(", ")}</td><tr>`;
			}
		} else {
			const cat = target;
			buffer += `<td colspan="2">${this.tr`There are <strong>${list.length}</strong> questions in the ${cat} category.`}</td></tr>` +
				`<tr><th>#</th><th>${this.tr`Question`}</th></tr>`;
			for (const [i, entry] of list.entries()) {
				buffer += `<tr><td><strong>${(i + 1)}</strong></td><td>${entry.question}</td></tr>`;
			}
		}
		buffer += "</table></div>";

		this.sendReply(buffer);
	},
	qshelp: [
		"/trivia qs - View the distribution of questions in the question database.",
		"/trivia qs [category] - View the questions in the specified category. Requires: % @ # &",
	],

	cssearch: 'search',
	casesensitivesearch: 'search',
	search(target, room, user, connection, cmd) {
		room = this.requireRoom('questionworkshop' as RoomID);
		this.checkCan('show', null, room);
		if (!target.includes(',')) return this.errorReply(this.tr`No valid search arguments entered.`);

		let [type, ...query] = target.split(',');
		type = toID(type);
		if (/^q(?:uestion)?s?$/.test(type)) {
			type = 'questions';
		} else if (/^sub(?:mission)?s?$/.test(type)) {
			type = 'submissions';
		} else {
			return this.sendReplyBox(
				this.tr`No valid search category was entered. Valid categories: submissions, subs, questions, qs`
			);
		}

		let queryString = query.join(',').trim();
		if (!queryString) return this.errorReply(this.tr`No valid search query was entered.`);

		let transformQuestion = (question: string) => question;
		if (cmd === 'search') {
			queryString = queryString.toLowerCase();
			transformQuestion = (question: string) => question.toLowerCase();
		}
		const results: TriviaQuestion[] = [];
		const data = triviaData[type as 'questions' | 'submissions'];
		for (const category in data) {
			results.push(...data[category].filter(
				q => transformQuestion(q.question).includes(queryString) && !SPECIAL_CATEGORIES[q.category]
			));
		}
		if (!results.length) return this.sendReply(this.tr`No results found under the ${type} list.`);

		let buffer = `|raw|<div class="ladder"><table><tr><th>#</th><th>${this.tr`Category`}</th><th>${this.tr`Question`}</th></tr>` +
			`<tr><td colspan="3">${this.tr`There are <strong>${results.length}</strong> matches for your query:`}</td></tr>`;
		buffer += results.map(
			(q, i) => this.tr`<tr><td><strong>${i + 1}</strong></td><td>${q.category}</td><td>${q.question}</td></tr>`
		).join('');
		buffer += "</table></div>";

		this.sendReply(buffer);
	},
	searchhelp: [
		`/trivia search [type], [query] - Searches for questions based on their type and their query. This command is case-insensitive. Valid types: submissions, subs, questions, qs. Requires: + % @ * &`,
		`/trivia casesensitivesearch [type], [query] - Like /trivia search, but is case sensitive (capital letters matter). Requires: + % @ * &`,
	],

	rank(target, room, user) {
		room = this.requireRoom('trivia' as RoomID);

		let name;
		let userid;
		if (!target) {
			name = Utils.escapeHTML(user.name);
			userid = user.id;
		} else {
			this.splitTarget(target, true);
			name = Utils.escapeHTML(this.targetUsername);
			userid = toID(name);
		}

		const allTimeScore = triviaData.leaderboard![userid];
		if (!allTimeScore) return this.sendReplyBox(this.tr`User '${name}' has not played any trivia games yet.`);
		const score = triviaData.altLeaderboard![userid] || [0, 0, 0];

		const ranks = cachedAltLadder.get().ranks[userid];
		const allTimeRanks = cachedLadder.get().ranks[userid];
		const row = (i: number) => `<strong>${score[i]}</strong>${ranks ? ` (#${ranks[i]})` : ""}, ` +
			this.tr`all time:` + ` <strong>${allTimeScore[i]}</strong> (#${allTimeRanks[i]})<br />`;
		this.sendReplyBox(
			this.tr`User: <strong>${name}</strong>` + `<br />` +
			this.tr`Leaderboard score: ${row(0)}` +
			this.tr`Total game points: ${row(1)}` +
			this.tr`Total correct answers: ${row(2)}`
		);
	},
	rankhelp: [`/trivia rank [username] - View the rank of the specified user. If no name is given, view your own.`],

	alltimeladder: 'ladder',
	ladder(target, room, user, connection, cmd) {
		room = this.requireRoom('trivia' as RoomID);
		if (!this.runBroadcast()) return false;
		const cache = cmd === 'ladder' ? cachedAltLadder : cachedLadder;
		const {ladder} = cache.get();
		const leaderboard = cache.leaderboard;
		if (!ladder.length) return this.errorReply(this.tr`No trivia games have been played yet.`);

		let buffer = "|raw|<div class=\"ladder\" style=\"overflow-y: scroll; max-height: 300px;\"><table>" +
			`<tr><th>${this.tr`Rank`}</th><th>${this.tr`User`}</th><th>${this.tr`Leaderboard score`}</th><th>${this.tr`Total game points`}</th><th>${this.tr`Total correct answers`}</th></tr>`;
		let num = parseInt(target);
		if (!num || num < 0) num = 100;
		if (num > ladder.length) num = ladder.length;
		for (let i = Math.max(0, num - 100); i < num; i++) {
			const leaders = ladder[i];
			for (const leader of leaders) {
				const rank = leaderboard[leader as unknown as string];
				const leaderObj = Users.getExact(leader as unknown as string);
				const leaderid = leaderObj ? Utils.escapeHTML(leaderObj.name) : leader as unknown as string;
				buffer += `<tr><td><strong>${(i + 1)}</strong></td><td>${leaderid}</td><td>${rank[0]}</td><td>${rank[1]}</td><td>${rank[2]}</td></tr>`;
			}
		}
		buffer += "</table></div>";

		return this.sendReply(buffer);
	},
	ladderhelp: [`/trivia ladder [num] - View information about 15 users on the trivia leaderboard.`],
	alltimeladderhelp: [`/trivia ladder [num] - View information about 15 users on the all time trivia leaderboard.`],

	clearquestions: 'clearqs',
	clearqs(target, room, user) {
		room = this.requireRoom('questionworkshop' as RoomID);
		this.checkCan('declare', null, room);
		target = toID(target);
		const category = CATEGORY_ALIASES[target] || target;
		if (ALL_CATEGORIES[category]) {
			if (SPECIAL_CATEGORIES[category]) {
				triviaData.questions![category] = [];
				writeTriviaData();
				return this.privateModAction(room.tr`${user.name} removed all questions of category '${category}'.`);
			} else {
				return this.errorReply(this.tr`You cannot clear the category '${ALL_CATEGORIES[category]}'.`);
			}
		} else {
			return this.errorReply(this.tr`'${category}' is an invalid category.`);
		}
	},
	clearqshelp: [`/trivia clears [category] - Remove all questions of the given category. Requires: # &`],

	pastgames: 'history',
	history(target, room, user) {
		room = this.requireRoom('trivia' as RoomID);
		if (!this.runBroadcast()) return false;
		if (!triviaData.history?.length) return this.sendReplyBox(this.tr`There is no game history.`);

		const games = [...triviaData.history].reverse();
		const buf = [];
		for (const [i, game] of games.entries()) {
			let gameInfo = Utils.html`<b>${i + 1}.</b> ${this.tr`${game.mode} mode, ${game.length} length Trivia game in the ${game.category} category`}`;
			if (game.creator) gameInfo += Utils.html` ${this.tr`hosted by ${game.creator}`}`;
			gameInfo += '.';
			buf.push(gameInfo);
		}

		return this.sendReplyBox(buf.join('<br />'));
	},
	historyhelp: [`/trivia history - View a list of the 10 most recently played trivia games.`],

	removepoints: 'addpoints',
	addpoints(target, room, user, connection, cmd) {
		room = this.requireRoom('trivia' as RoomID);
		this.checkCan('editroom', null, room);

		const [userid, pointString] = this.splitOne(target).map(toID);

		const points = parseInt(pointString);
		if (isNaN(points)) return this.errorReply(`You must specify a number of points to add/remove.`);
		const isRemoval = cmd === 'removepoints';

		if (!hasLeaderboardEntry(userid)) {
			return this.errorReply(`The user '${userid}' has no Trivia leaderboard entry.`);
		}

		if (userid in triviaData.leaderboard!) triviaData.leaderboard![userid][0] += (isRemoval ? points * -1 : points);
		if (userid in triviaData.altLeaderboard!) triviaData.altLeaderboard![userid][0] += (isRemoval ? points * -1 : points);
		writeTriviaData();
		cachedLadder.invalidateCache();
		cachedAltLadder.invalidateCache();

		this.modlog(`TRIVIAPOINTS ${isRemoval ? 'REMOVE' : 'ADD'}`, userid, `${points} points`);
		this.privateModAction(
			isRemoval ?
				`${user.name} removed ${points} points from ${userid}'s Trivia leaderboard score.` :
				`${user.name} added ${points} points to ${userid}'s Trivia leaderboard score.`
		);
	},
	addpointshelp: [
		`/trivia removepoints [user], [points] - Remove points from a given user's score on the Trivia leaderboard.`,
		`/trivia addpoints [user], [points] - Add points to a given user's score on the Trivia leaderboard.`,
		`Requires: # &`,
	],

	removeleaderboardentry(target, room, user) {
		room = this.requireRoom('trivia' as RoomID);
		this.checkCan('editroom', null, room);

		const userid = toID(target);
		if (!userid) return this.parse('/help trivia removeleaderboardentry');
		if (!hasLeaderboardEntry(userid)) {
			return this.errorReply(`The user '${userid}' has no Trivia leaderboard entry.`);
		}

		const command = `/trivia removeleaderboardentry ${userid}`;
		if (user.lastCommand !== command) {
			user.lastCommand = command;
			this.sendReply(`Are you sure you want to DELETE ALL LEADERBOARD SCORES FOR '${userid}'?`);
			this.sendReply(`If so, type ${command} to confirm.`);
			return;
		}
		user.lastCommand = '';

		if (userid in triviaData.leaderboard!) delete triviaData.leaderboard![userid];
		if (userid in triviaData.altLeaderboard!) delete triviaData.altLeaderboard![userid];
		writeTriviaData();
		cachedLadder.invalidateCache();
		cachedAltLadder.invalidateCache();

		this.modlog(`TRIVIAPOINTS DELETE`, userid);
		this.privateModAction(`${user.name} removed ${userid}'s Trivia leaderboard entries.`);
	},
	removeleaderboardentryhelp: [
		`/trivia removeleaderboardentry [user] — Remove all leaderboard entries for a user. Requires: # &`,
	],

	mergealt: 'mergescore',
	mergescores: 'mergescore',
	mergescore(target, room, user) {
		const altid = toID(target);
		if (!altid) return this.parse('/help trivia mergescore');

		try {
			mergeAlts(user.id, altid);
			return this.sendReply(`Your Trivia leaderboard score has been transferred to '${altid}'!`);
		} catch (err) {
			if (!err.message.includes('/trivia mergescore')) throw err;

			requestAltMerge(altid, user.id);
			return this.sendReply(
				`A Trivia leaderboard score merge with ${altid} is now pending! ` +
				`To complete the merge, log in on the account '${altid}' and type /trivia mergescore ${user.id}`
			);
		}
	},
	mergescorehelp: [
		`/trivia mergescore [user] — Merge another user's Trivia leaderboard score with yours.`,
	],

	help(target, room, user) {
		return this.parse(`${this.cmdToken}help trivia`);
	},
	triviahelp() {
		this.sendReply(
			`|html|<div class="infobox">` +
			`<strong>Categories</strong>: <code>Arts &amp; Entertainment</code>, <code>Pok&eacute;mon</code>, <code>Science &amp; Geography</code>, <code>Society &amp; Humanities</code>, <code>Random</code>, and <code>All</code>.<br />` +
			`<details><summary><strong>Modes</strong></summary><ul>` +
				`<li>First: the first correct responder gains 5 points.</li>` +
				`<li>Timer: each correct responder gains up to 5 points based on how quickly they answer.</li>` +
				`<li>Number: each correct responder gains up to 5 points based on how many participants are correct.</li>` +
				`<li>Triumvirate: The first correct responder gains 5 points, the second 3 points, and the third 1 point.</li>` +
				`<li>Random: randomly chooses one of First, Timer, Number, or Triumvirate.</li>` +
			`</ul></details>` +
			`<details><summary><strong>Game lengths</strong></summary><ul>` +
				`<li>Short: 20 point score cap. The winner gains 3 leaderboard points.</li>` +
				`<li>Medium: 35 point score cap. The winner gains 4 leaderboard points.</li>` +
				`<li>Long: 50 point score cap. The winner gains 5 leaderboard points.</li>` +
				`<li>Infinite: No score cap. The winner gains 5 leaderboard points, which increases the more questions they answer.</li>` +
			`</ul></details>` +
			`<details><summary><strong>Game commands</strong></summary><ul>` +
				`<li><code>/trivia new [mode], [category], [length]</code> - Begin signups for a new Trivia game. Requires: + % @ # &</li>` +
				`<li><code>/trivia sortednew [mode], [category], [length]</code> — Begin a new Trivia game in which the question order is not randomized. Requires: + % @ # &</li>` +
				`<li><code>/trivia join</code> - Join a game of Trivia or Mastermind during signups.</li>` +
				`<li><code>/trivia start</code> - Begin the game once enough users have signed up. Requires: + % @ # &</li>` +
				`<li><code>/ta [answer]</code> - Answer the current question.</li>` +
				`<li><code>/trivia kick [username]</code> - Disqualify a participant from the current trivia game. Requires: % @ # &</li>` +
				`<li><code>/trivia leave</code> - Makes the player leave the game.</li>` +
				`<li><code>/trivia end</code> - End a trivia game. Requires: + % @ # &</li>` +
				`<li><code>/trivia win</code> - End a trivia game and tally the points to find winners. Requires: + % @ # & in Infinite length, else # &</li>` +
				`<li><code>/trivia pause</code> - Pauses a trivia game. Requires: + % @ # &</li>` +
				`<li><code>/trivia resume</code> - Resumes a paused trivia game. Requires: + % @ # &</li>` +
			`</ul></details>` +
				`<details><summary><strong>Question-modifying commands</strong></summary><ul>` +
				`<li><code>/trivia submit [category] | [question] | [answer1], [answer2] ... [answern]</code> - Adds question(s) to the submission database for staff to review. Requires: + % @ # &</li>` +
				`<li><code>/trivia review</code> - View the list of submitted questions. Requires: @ # &</li>` +
				`<li><code>/trivia accept [category], [index1], [index2], ... [indexn] OR all</code> - Add questions from the submission database to the question database using their index numbers or ranges of them. Requires: @ # &</li>` +
				`<li><code>/trivia reject [category], [index1], [index2], ... [indexn] OR all</code> - Remove questions from the submission database using their index numbers or ranges of them. Requires: @ # &</li>` +
				`<li><code>/trivia add [category] | [question] | [answer1], [answer2], ... [answern]</code> - Adds question(s) to the question database. Requires: % @ # &</li>` +
				`<li><code>/trivia delete [question]</code> - Delete a question from the trivia database. Requires: % @ # &</li>` +
				`<li><code>/trivia move [category] | [question]</code> - Change the category of question in the trivia database. Requires: % @ # &</li>` +
				`<li><code>/trivia qs</code> - View the distribution of questions in the question database.</li>` +
				`<li><code>/trivia qs [category]</code> - View the questions in the specified category. Requires: % @ # &</li>` +
				`<li><code>/trivia clearqs [category]</code> - Clear all questions in the given category. Requires: # &</li>` +
			`</ul></details>` +
			`<details><summary><strong>Informational commands</strong></summary><ul>` +
				`<li><code>/trivia search [type], [query]</code> - Searches for questions based on their type and their query. Valid types: <code>submissions</code>, <code>subs</code>, <code>questions</code>, <code>qs</code>. Requires: + % @ # &</li>` +
				`<li><code>/trivia casesensitivesearch [type], [query]</code> - Like <code>/trivia search</code>, but is case sensitive (i.e., capitalization matters). Requires: + % @ * &</li>` +
				`<li><code>/trivia status [player]</code> - lists the player's standings (your own if no player is specified) and the list of players in the current trivia game.</li>` +
				`<li><code>/trivia rank [username]</code> - View the rank of the specified user. If none is given, view your own.</li>` +
				`<li><code>/trivia history</code> - View a list of the 10 most recently played trivia games.</li>` +
			`</ul></details>` +
			`<details><summary><strong>Leaderboard commands</strong></summary><ul>` +
				`<li><code>/trivia ladder</code> - View information about the top 15 users on the Trivia leaderboard.</li>` +
				`<li><code>/trivia alltimeladder</code> - View information about the top 15 users on the all time Trivia leaderboard.</li>` +
				`<li><code>/trivia mergescore [user]</code> — Merge another user's Trivia leaderboard score with yours.</li>` +
				`<li><code>/trivia addpoints [user], [points]</code> - Add points to a given user's score on the Trivia leaderboard. Requires: # &</li>` +
				`<li><code>/trivia removepoints [user], [points]</code> - Remove points from a given user's score on the Trivia leaderboard. Requires: # &</li>` +
				`<li><code>/trivia removeleaderboardentry [user]</code> — Remove all Trivia leaderboard entries for a user. Requires: # &</li>` +

			`</ul></details>`
		);
	},
};


const mastermindCommands: ChatCommands = {
	answer: triviaCommands.answer,
	end: triviaCommands.end,
	kick: triviaCommands.kick,

	new(target, room, user) {
		room = this.requireRoom('trivia' as RoomID);
		this.checkCan('show', null, room);

		const finalists = parseInt(target);
		if (isNaN(finalists) || finalists < 2) {
			return this.errorReply(this.tr`You must specify a number that is at least 2 for finalists.`);
		}

		room.game = new Mastermind(room, finalists);
	},
	newhelp: [
		`/mastermind new [number of finalists] — Starts a new game of Mastermind with the specified number of finalists. Requires: + % @ # &`,
	],

	start(target, room, user) {
		room = this.requireRoom();
		this.checkCan('show', null, room);
		this.checkChat();
		const game = getMastermindGame(room);

		const [category, timeoutString, player] = target.split(',').map(toID);
		if (!player) return this.parse(`/help mastermind start`);
		if (!(category in ALL_CATEGORIES)) {
			return this.errorReply(this.tr`${category} is not a valid category.`);
		}
		const categoryName = ALL_CATEGORIES[CATEGORY_ALIASES[category] || category];
		const timeout = parseInt(timeoutString);
		if (isNaN(timeout) || timeout < 1 || (timeout * 1000) > Chat.MAX_TIMEOUT_DURATION) {
			return this.errorReply(this.tr`You must specify a round length of at least 1 second.`);
		}

		const questions = Utils.shuffle(getQuestions(category));
		if (!questions.length) {
			return this.errorReply(this.tr`There are no questions in the ${categoryName} category.`);
		}

		game.startRound(player, category, questions, timeout);
	},
	starthelp: [
		`/mastermind start [category], [length in seconds], [player] — Starts a round of Mastermind for a player. Requires: + % @ # &`,
	],

	finals(target, room, user) {
		room = this.requireRoom();
		this.checkCan('show', null, room);
		this.checkChat();
		const game = getMastermindGame(room);
		if (!target) return this.parse(`/help mastermind finals`);

		const timeout = parseInt(target);
		if (isNaN(timeout) || timeout < 1 || (timeout * 1000) > Chat.MAX_TIMEOUT_DURATION) {
			return this.errorReply(this.tr`You must specify a length of at least 1 second.`);
		}

		game.startFinals(timeout);
	},
	finalshelp: [`/mastermind finals [length in seconds] — Starts the Mastermind finals. Requires: + % @ # &`],

	join(target, room, user) {
		room = this.requireRoom();
		getMastermindGame(room).addTriviaPlayer(user);
		this.sendReply(this.tr`You are now signed up for this game!`);
	},
	joinhelp: [`/mastermind join — Joins the current game of Mastermind.`],


	leave(target, room, user) {
		getMastermindGame(room).leave(user);
		this.sendReply(this.tr`You have left the current game of Mastermind.`);
	},
	leavehelp: [`/mastermind leave - Makes the player leave the game.`],

	pass(target, room, user) {
		room = this.requireRoom();
		const round = getMastermindGame(room).currentRound;
		if (!round) return this.errorReply(this.tr`No round of Mastermind is currently being played.`);
		if (!(user.id in round.playerTable)) {
			return this.errorReply(this.tr`You are not a player in the current round of Mastermind.`);
		}
		round.pass();
	},
	passhelp: [`/mastermind pass — Passes on the current question. Must be the player of the current round of Mastermind.`],

	'': 'players',
	players(target, room, user) {
		room = this.requireRoom();
		if (!this.runBroadcast()) return false;
		const game = getMastermindGame(room);

		let buf = this.tr`There is a Mastermind game in progress, and it is in its ${game.phase} phase.`;
		buf += `<br /><hr>${this.tr`Players`}: ${game.formatPlayerList()}`;

		this.sendReplyBox(buf);
	},

	help() {
		return this.parse(`${this.cmdToken}help mastermind`);
	},

	mastermindhelp() {
		if (!this.runBroadcast()) return;
		const commandHelp = [
			`<code>/mastermind new [number of finalists]</code>: starts a new game of Mastermind with the specified number of finalists. Requires: + % @ # &`,
			`<code>/mastermind start [category], [length in seconds], [player]</code>: starts a round of Mastermind for a player. Requires: + % @ # &`,
			`<code>/mastermind finals [length in seconds]</code>: starts the Mastermind finals. Requires: + % @ # &`,
			`<code>/mastermind kick [user]</code>: kicks a user from the current game of Mastermind. Requires: % @ # &`,
			`<code>/mastermind join</code>: joins the current game of Mastermind.`,
			`<code>/mastermind answer [answer]</code>: answers a question in a round of Mastermind.`,
			`<code>/mastermind pass</code>: passes on the current question. Must be the player of the current round of Mastermind.`,
		];
		return this.sendReplyBox(
			`<strong>Mastermind</strong> is a game in which each player tries to score as many points as possible in a timed round where only they can answer, ` +
			`and the top X players advance to the finals, which is a timed game of Trivia in which only the first player to answer a question recieves points.` +
			`<details><summary><strong>Commands</strong></summary>${commandHelp.join('<br />')}</details>`
		);
	},
};

export const commands: ChatCommands = {
	mm: mastermindCommands,
	mastermind: mastermindCommands,
	mastermindhelp: mastermindCommands.mastermindhelp,
	trivia: triviaCommands,
	ta: triviaCommands.answer,
	triviahelp: triviaCommands.triviahelp,
};

process.nextTick(() => {
	Chat.multiLinePattern.register('/trivia add ', '/trivia submit ');
});