advent2022/d02/main.js

const fs = require('fs');
const readline = require('readline');

const ROCK = 1;
const PAPER = 2;
const SCISSORS = 3;

const LOSE = 0;
const DRAW = 3;
const WIN = 6;

function isWin(input, output) {
    return ((input === ROCK && output == PAPER) ||
        (input === PAPER && output === SCISSORS) ||
        (input === SCISSORS && output === ROCK));
}

function isLoss(input, output) {
    return input != output && !isWin(input, output);
}

function getSymbol(input, expected) {
    if (expected === DRAW)
        return input;
    if (expected === WIN) {
        if (isWin(input, ROCK)) return ROCK;
        if (isWin(input, PAPER)) return PAPER;
        if (isWin(input, SCISSORS)) return SCISSORS;
    } else {
        if (isLoss(input, ROCK)) return ROCK;
        if (isLoss(input, PAPER)) return PAPER;
        if (isLoss(input, SCISSORS)) return SCISSORS;
    }
}

async function main() {
    let part1 = 0;
    let part2 = 0;
    for await (let line of readline.createInterface({ input: process.stdin })) {
        let input;
        let output;
        let expectResult;

        if (!line || !line.length)
            continue;
        switch (line[0]) {
            case 'A': input = ROCK; break;
            case 'B': input = PAPER; break;
            case 'C': input = SCISSORS; break;
        }
        switch (line[2]) {
            case 'X': output = ROCK; expectResult = LOSE; break;
            case 'Y': output = PAPER; expectResult = DRAW; break;
            case 'Z': output = SCISSORS; expectResult = WIN; break;
        }
        part1 += output;
        part2 += expectResult + getSymbol(input, expectResult);
        if (isWin(input, output))
            part1 += WIN;
        else if (input === output)
            part1 += DRAW;
    }
    console.log("Score part1: ", part1);
    console.log("Score part2: ", part2);
};

(main());