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 dataToParse =
    "11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124";
*/

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

const isDuplicateOld = (val = "") => {
    const strVal = `${val}`,
        strLen = strVal.length;
    if (!strLen || strLen % 2 === 1) return false;

    return strVal.substring(0, strLen / 2) === strVal.substring(strLen / 2);
};

const duplicateRE = /^(\d+)\1+$/;
const isDuplicate = (val = "") => {
    // new process - runa  regex that looks for repeats from start to end
    const strVal = `${val}`,
        strLen = strVal.length;
    if (!strLen) return false;

    const matches = strVal.match(duplicateRE);

    if (matches === null) return false;

    return matches.length >= 1 && matches[0] === strVal;
};

const ranges = dataToParse.split(",");
let total = 0;

ranges.forEach((range) => {
    console.log(`> running range ${range}`);
    const [start, end] = range.split("-"),
        last = end * 1;
    let curr = start * 1;
    while (curr <= last) {
        if (isDuplicate(curr)) {
            total += curr;
            console.log(`>> found duplicate: ${curr} / ${total}`);
        }
        curr++;
    }
});

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