// I wanted to try this one again with a different approach just as an exercise
// in a more complex, but faster way implementing the solutions

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

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

  const path = [];

  const dirsMap = {};

  for (const line of input) {
    console.log("PATH ", path);
    if(line === "$ cd /") {
      continue;
    }
    if(line === "$ cd ..") {
      path.pop();
      continue;
    }
    const cdCmd = line.match(/\$ cd (.+)/);
    if(cdCmd) {
      const [_, cdDir] = cdCmd;
      path.push(cdDir);
      continue;
    }
    const file = line.match(/^\d+/);
    if(file) {
      const [size] = file;
      updateDirsOnPath(dirsMap, ["root", ...path], parseFloat(size));
      continue;
    }
  }

  console.log("ANSWER: ", sum(Object.values(dirsMap).filter(x => x <= 100000)))

  console.log("ANSWER 2: ", Object.values(dirsMap).reduce((best, cur) => cur > dirsMap.root - 40000000 && cur < best ? cur : best, Infinity));
})();

const updateDirsOnPath = (dirsMap, path, size) => {
  if(!path.length) return;
  const pwd = path.join("/");
  dirsMap[path] = (dirsMap[path] || 0) + size;
  updateDirsOnPath(dirsMap, path.slice(0, -1), size);
}

const sum = (arr) => arr.reduce((total, num) => total+num, 0);