const { Glib } = require('../../lib');

const parse = (input) => Glib.fromLines(input).toInts().array;

module.exports = {
  '1': (input) => {
    const program = parse(input);
    let programCounter = 0n;
    let step = 0;
    while (programCounter < program.length) {
      const delta = program[programCounter];
      program[programCounter]++;
      programCounter += delta;
      step++;
    }
    return step;
  },
  '2': (input) => {
    const program = parse(input);
    let programCounter = 0n;
    let step = 0;
    while (programCounter < program.length) {
      const delta = program[programCounter];
      if (delta >= 3n) {
        program[programCounter]--;
      } else {
        program[programCounter]++;
      }
      programCounter += delta;
      step++;
    }
    return step;
  },
};