Added Magic 8-Ball game.

src/games/8ball.js

@@ -0,0 +1,102 @@
+'use strict';
+
+const config = require('config');
+const crypto = require('crypto');
+const timers = require('timers/promises');
+const stringSimilarity = require('string-similarity');
+
+const style = require('../utils/style');
+
+const contemplations = [
+	'Hmmm...',
+	'🤔',
+	'Let\'s see...',
+];
+
+const answers = {
+	positive: [
+		'It is certain',
+		'It is decidedly so',
+		'Without a doubt',
+		'Yes definitely',
+		'You may rely on it',
+		'As I see it, yes',
+		'Most likely',
+		'Outlook good',
+		'Yes',
+		'Signs points to yes',
+	],
+	inconclusive: [
+		'Reply hazy, try again',
+		'Ask again later',
+		'Better not tell you now',
+		'Cannot predict now',
+		'Concentrate and ask again',
+	],
+	negative: [
+		'Don\'t count on it',
+		'My reply is no',
+		'My sources say no',
+		'Outlook not so good',
+		'Very doubtful',
+	],
+};
+
+const questions = new Map();
+
+function purgeQuestions() {
+	Array.from(questions.entries()).forEach(([question, { timestamp }]) => {
+		if (new Date() - timestamp > 5 * 60 * 1000) { // 5 minutes
+			questions.delete(question);
+		}
+	});
+}
+
+async function onCommand(args, context) {
+	const question = args.join(' ');
+
+	if (!/\w+\s+\w+\?/.test(question)) {
+		context.sendMessage('Please ask me a question, any question...', context.room.id);
+		return;
+	}
+
+	// attempt to give consistent answers between similar questions
+	const similarQuestion = questions.size > 0
+		? stringSimilarity.findBestMatch(question, Array.from(questions.keys())).bestMatch
+		: null;
+
+	const answerType = similarQuestion?.rating > 0.5
+		? questions.get(similarQuestion.target).answerType
+		: Object.keys(answers)[crypto.randomInt(0, 3)];
+
+	const answer = answers[answerType][crypto.randomInt(0, answers[answerType].length)];
+
+	questions.set(question, { answerType, timestamp: new Date() });
+
+	context.sendMessage(`🎱 ${contemplations[crypto.randomInt(0, contemplations.length)]}`, context.room.id, { label: false });
+
+	await timers.setTimeout(Math.random() * 3000 + 1000);
+
+	context.sendMessage(style.bgnavy(style.white(`◣ ${answer} ◢`)), context.room.id, {
+		label: false,
+		style: {
+			color: config.schatColors.white,
+			background: config.schatColors.navy,
+		},
+	});
+
+	purgeQuestions();
+}
+
+function onMessage(message, context) {
+	const regex = new RegExp(`^${config.usernamePrefix}${config.user.username}:?\\s+\\w+\\s+\\w+.*\\?`, 'i');
+
+	if (regex.test(message.body)) {
+		onCommand([message.body.replaceAll(`${config.usernamePrefix}${config.user.username}:?`, '').trim()], context, false);
+	}
+}
+
+module.exports = {
+	onCommand,
+	onMessage,
+};