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 modulo = (n, m) => ((n % m + m) % m);

const keypress = async () => {
  process.stdin.setRawMode(true)
  return new Promise(resolve => process.stdin.once('data', data => {
    const byteArray = [...data]
    if (byteArray.length > 0 && byteArray[0] === 3) {
      console.log('^C')
      process.exit(1)
    }
    process.stdin.setRawMode(false)
    resolve()
  }))
}

const coords = ([x, y, z]) => `${x},${y},${z}`;

const createNode = (arr, order, first, par, i = 0) => {
};

const runOp = (a, op, b) => {
  switch(op) {
    case "+":
      return a + b;
    case "-":
      return a - b;
    case "*":
      return a * b;
    case "/":
      return a / b;
  }

  throw(Error(`Op not found! - ${op}`));
}

const invertOp = (op) => {
  switch(op) {
    case "+":
      return "-";
    case "-":
      return "+";
    case "*":
      return "/";
    case "/":
      return "*";
  }
};

const inflateMonkeys = (monkeys, name) => {
  if(name === "humn") {
    return x => x;
  }
  const command = monkeys[name];
  const number = parseInt(command);
  if(!isNaN(number)) {
    return number;
  }

  const [_, aName, op, bName] = command.match(/([a-z]+) (.) ([a-z]+)/);

  const a = inflateMonkeys(monkeys, aName);
  const b = inflateMonkeys(monkeys, bName);

  if(typeof a === "function") {
    if(name === "root") {
      return a(b);
    }
    return other => a(runOp(other, invertOp(op), b));
  }
  if(typeof b === "function") {
    if(name === "root") {
      return b(a);
    }
    if(op === "/" || op === "-") {
      return other => b(runOp(a, op, other));
    }
    return other => b(runOp(other, invertOp(op), a));
  }

  return runOp(a, op, b);
};

const main = async () => {
  const monkeys = (await fs.readFile("./input.txt", 'utf8')).slice(0, -1).split("\n")
    .reduce((monkeys, row) => {
      const [_, name, command] = row.match(/([a-z]+): (.*)/);
      monkeys[name] = command;
      return monkeys;
    }, {});;

  const root = inflateMonkeys(monkeys, "root");

  console.log("root: ", root);

}


main();