import { promises as fsp } from "node:fs";

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

        return contents.trim();
    } catch (err) {
        console.error(err);
    }
}

const findIndexOfHighestNumber = (arrayOfNumbers, start, end) => {
    let highestIndex = start;
    for (let i = start; i <= end; i++) {
        if (arrayOfNumbers[i] > arrayOfNumbers[highestIndex]) highestIndex = i;
    }
    return highestIndex;
};

const findHighestOutput = (bank) => {
    let arr = Array.from(bank);
    let curr = Array(arr.length).fill("");
    let foundNumbers = 0;
    const desiredNumbers = 12;
    let start = 0;

    while (foundNumbers < desiredNumbers) {
        const index = findIndexOfHighestNumber(
            bank,
            start,
            arr.length - desiredNumbers + foundNumbers
        );
        curr[index] = arr[index];

        // prep next run
        foundNumbers++;
        start = index + 1;
    }
    return Number.parseInt(curr.join(""), 10);
};

/*
const dataToParse = `987654321111111
811111111111119
234234234234278
818181911112111`;
*/

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

const banks = dataToParse.split("\n");
let total = 0;

banks.forEach((bank) => {
    console.log(`Processing bank ${bank}`);
    const output = findHighestOutput(bank);
    console.log(`> found ${output}`);
    total += output;
});

console.log(`Total: ${total}`);