import { promises as fsPromises } from "fs";

async function asyncReadFile(filename) {
    try {
        const contents = await fsPromises.readFile(filename, "utf-8");

        const arr = contents.split(/\r?\n/);

        return arr;
    } catch (err) {
        console.error(err);
    }
}

// dial 0-99

const DIAL_START = 50;

const Dial = (start = DIAL_START) => {
    let countZero = 0,
        current = start;
    const getCountZero = () => countZero,
        reset = () => {
            countZero = 0;
            current = start;
        },
        rotate = (initialVal = "") => {
            const val = initialVal.trim(),
                dir = val.length ? val.substring(0, 1).toUpperCase() : "",
                amount = val.length ? (val.substring(1) * 1) % 100 : 0;

            if (!dir) {
                console.log(`${val} => invalid value!`);
            }

            const initial = current;

            if (dir === "R") {
                current = (current + amount) % 100;
            } else if (dir === "L") {
                current =
                    (current - amount + (current - amount < 0 ? 100 : 0)) % 100;
            }
            console.log(
                `${val} => rotating ${
                    dir === "R" ? "RIGHT" : "LEFT"
                } ${amount} from ${initial} to ${current}`
            );

            if (current === 0) {
                countZero++;
                console.log("CountZero!");
            }
        };

    return {
        getCountZero,
        reset,
        rotate,
    };
};

const dial = Dial();

/*
// Test Data

const dataToParse = [
  "L68",
  "L30",
  "R48",
  "L5",
  "R60",
  "L55",
  "L1",
  "L99",
  "R14",
  "L82",
];
*/

const dataToParse = await asyncReadFile("../input.txt");

dataToParse.forEach((val) => {
    if (val.trim()) dial.rotate(val);
});

console.log(`Final countZero is ${dial.getCountZero()}`);