xiao/commands/games-sp/blackjack.js

const Command = require('../../framework/Command');
const { stripIndents } = require('common-tags');
const { verify } = require('../../util/Util');
const Deck = require('../../structures/cards/Deck');
const hitWords = ['hit', 'hit me'];
const standWords = ['stand'];

module.exports = class BlackjackCommand extends Command {
	constructor(client) {
		super(client, {
			name: 'blackjack',
			aliases: ['twenty-one', '21', 'bj'],
			group: 'games-sp',
			description: 'Play a game of blackjack.',
			game: true,
			args: [
				{
					key: 'deckCount',
					label: 'amount of decks',
					type: 'integer',
					default: 1,
					max: 8,
					min: 1
				}
			]
		});
	}

	async run(msg, { deckCount }) {
		const deck = new Deck({ deckCount });
		const dealerHand = [];
		this.draw(dealerHand, deck);
		this.draw(dealerHand, deck);
		const playerHand = [];
		this.draw(playerHand, deck);
		this.draw(playerHand, deck);
		const dealerInitialTotal = this.calculate(dealerHand);
		const playerInitialTotal = this.calculate(playerHand);
		if (dealerInitialTotal === 21 && playerInitialTotal === 21) {
			return msg.say('Well, both of you just hit blackjack. Right away. Rigged.');
		} else if (dealerInitialTotal === 21) {
			return msg.say('Ouch, the dealer hit blackjack right away! Try again!');
		} else if (playerInitialTotal === 21) {
			return msg.say('Wow, you hit blackjack right away! Lucky you!');
		}
		let playerTurn = true;
		let win = false;
		let reason;
		while (!win) {
			if (playerTurn) {
				await msg.say(stripIndents`
					**First Dealer Card:** ${dealerHand[0].display}

					**You (${this.calculate(playerHand)}):**
					${playerHand.map(card => card.display).join('\n')}

					_Hit?_
				`);
				const hit = await verify(msg.channel, msg.author, { extraYes: hitWords, extraNo: standWords });
				if (hit) {
					const card = this.draw(playerHand, deck);
					const total = this.calculate(playerHand);
					if (total > 21) {
						reason = `You drew ${card.display}, total of ${total}! Bust`;
						break;
					} else if (total === 21) {
						reason = `You drew ${card.display} and hit 21`;
						win = true;
					}
				} else {
					const dealerTotal = this.calculate(dealerHand);
					await msg.say(`Second dealer card is ${dealerHand[1].display}, total of ${dealerTotal}.`);
					playerTurn = false;
				}
			} else {
				const inital = this.calculate(dealerHand);
				let card;
				if (inital < 17) card = this.draw(dealerHand, deck);
				const total = this.calculate(dealerHand);
				if (total > 21) {
					reason = `Dealer drew ${card.display}, total of ${total}! Dealer bust`;
					win = true;
				} else if (total >= 17) {
					const playerTotal = this.calculate(playerHand);
					if (total === playerTotal) {
						reason = `${card ? `Dealer drew ${card.display}, making it ` : ''}${playerTotal}-${total}`;
						break;
					} else if (total > playerTotal) {
						reason = `${card ? `Dealer drew ${card.display}, making it ` : ''}${playerTotal}-**${total}**`;
						break;
					} else {
						reason = `${card ? `Dealer drew ${card.display}, making it ` : ''}**${playerTotal}**-${total}`;
						win = true;
					}
				} else {
					await msg.say(`Dealer drew ${card.display}, total of ${total}.`);
				}
			}
		}
		if (win) return msg.say(`${reason}! You won!`);
		return msg.say(`${reason}! Too bad.`);
	}

	draw(hand, deck) {
		const card = deck.draw();
		hand.push(card);
		return card;
	}

	calculate(hand) {
		return hand.sort((a, b) => a.blackjackValue - b.blackjackValue).reduce((a, b) => {
			let { blackjackValue } = b;
			if (blackjackValue === 11 && a + blackjackValue > 21) blackjackValue = 1;
			return a + blackjackValue;
		}, 0);
	}
};