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let input = `forward 2
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down 1
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forward 4`;

function calculatePosition(moves) {
  let horizontal = 0;
  let depth = 0;
  let aim = 0;

  for (const move of moves) {
    switch (move.direction) {
      case "forward":
        horizontal += move.distance;
        depth += aim * move.distance;
        break;
      case "up":
        aim -= move.distance;
        break;
      case "down":
        aim += move.distance;
        break;
    }
  }
  return { horizontal, depth, aim };
}

const { horizontal, depth } = calculatePosition(
  input.split(/\n/).map((element) => {
    let [direction, distance] = element.split(" ");

    return { direction, distance: parseInt(distance) };
  })
);
console.log(horizontal * depth);