import fs from "node:fs";
import { printTime, now, toNum } from "../util";

const test = true;

const data = fs.readFileSync(
  test ? "./inputs/testinput" : "./inputs/input",
  "utf8"
);

let timer = now.instant();
console.log(
  "part one:",
  data
    .split("\n")
    .slice(0, -1)[0]
    .split("")
    .map(toNum)
    .reduce((disk, curr, index) => {
      const fill = index % 2 === 0 ? index / 2 : -1; // -1 represents free space
      return [...disk, ...Array.from({ length: curr }, () => fill)];
    }, [] as Array<number>)
    .reduce((disk, current, i, a) => {
      console.log(disk, current, i, a);
      if (current === -1) {
        while (true) {
          let tail = a.pop();
          if (tail === -1 || tail === undefined) {
            continue;
          } else {
            return [...disk, tail];
          }
        }
      } else {
        return [...disk, current];
      }
    }, [] as Array<number>)
    .reduce((checksum, curr, i) => {
      console.log(curr, i);
      return checksum + curr * i;
    }, 0),
  printTime(now.instant().since(timer))
);

// timer = now.instant();
// console.log(
//   "part two:",
//   data.split("\n").slice(0, -1),
//   printTime(now.instant().since(timer))
// );