const fs = require('fs/promises');

const sum = (arr) => arr.reduce((total, num) => total+num, 0);
const arrayOfLength = n => Array.from(Array(n).keys()).map(() => {});

const main = async () => {
  const input = (await fs.readFile("./input.txt", 'utf8')).split(/\n+/).map(x => eval(x));

  const evaluatePair = ((l, r) => {
      console.log("Compare items ----- \n  ->", l, "\n  ->", r);

    if(typeof l === "undefined") {
      console.log("l ran out");
      return true;
    }
    if(typeof r === "undefined") {
      console.log("r ran out");
      return false;
    }

    if(typeof l === "number") {
      if(typeof r === "number") {
        if(l === r) {return undefined;}
        console.log("l to r");
        return l < r;
      }
      l = [l];
    }
    if(typeof r === "number") {
      r = [r]
    }
    for(let [i, subL] of Object.entries(l)) {
      const result = evaluatePair(subL, r[i]);
      if(typeof result !== "undefined") {
        return result
      }
    };
    if(l.length < r.length) {
      return true;
    }
  });

  input.push([[2]], [[6]]);
  input.sort((l, r) => {
    const result = evaluatePair(l, r);
    console.log("SORT RESULT: ", result);
    return result || typeof result === "undefined" ? -1 : 1;
  });

  console.log("Input: ", input);

  const firstIndex = input.findIndex(x => JSON.stringify(x) === "[[2]]") + 1;
  const secondIndex = input.findIndex(x => JSON.stringify(x) === "[[6]]") + 1;


  console.log(firstIndex * secondIndex);

}

main();