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import fs from "fs";
enum HandType {
highCard,
onePair,
twoPair,
threeOfAKind,
fullHouse,
fourOfAKind,
fiveOfAKind,
}
const cardStrength = [
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"T",
"J",
"Q",
"K",
"A",
];
function classifyHand(hand: string) {
const cards = hand.split("");
const counts = Array.from(new Set(cards))
.map((card) => cards.filter((c) => c === card).length)
.sort()
.reverse();
if (counts[0] === 5) return HandType.fiveOfAKind;
if (counts[0] === 4) return HandType.fourOfAKind;
if (counts[0] === 3 && counts[1] === 2) return HandType.fullHouse;
if (counts[0] === 3) return HandType.threeOfAKind;
if (counts[0] === 2 && counts[1] === 2) return HandType.twoPair;
if (counts[0] === 2) return HandType.onePair;
return HandType.highCard;
}
const input = fs
.readFileSync("./input.txt")
.toString()
.split("\n")
.slice(0, -1)
.map((line) => {
const match = line.match(/(.....) (\d+)/);
if (!match) throw new Error("Unexpected format");
return {
hand: match[1],
bid: Number(match[2]),
type: classifyHand(match[1]),
};
})
.sort((a, b) => {
const diff = a.type - b.type;
if (diff) return diff;
return [0, 1, 2, 3, 4].reduce((acc, index) => {
return acc
? acc
: cardStrength.indexOf(a.hand[index]) -
cardStrength.indexOf(b.hand[index]);
}, 0);
})
.reduce((sum, item, index) => sum + item.bid * (index + 1), 0);
console.log({ input });
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