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let input = `forward 2
down 8
down 1
up 7
forward 4
down 4
down 3
forward 2
forward 5
forward 2
forward 7
forward 8
down 7
forward 6
forward 1
down 8
down 8
up 9
down 9
forward 1
up 1
forward 6
forward 7
down 7
forward 4
forward 2
forward 1
forward 3
forward 8
forward 4
up 6
down 2
forward 4
down 3
up 3
up 2
up 3
forward 8
down 5
down 8
down 5
down 4
down 2
up 1
forward 6
forward 6
forward 8
up 5
down 5
forward 8
forward 7
down 9
down 7
down 6
down 3
forward 3
up 7
forward 2
up 6
forward 7
forward 9
down 9
forward 3
down 2
down 2
down 7
down 7
forward 8
down 7
forward 9
up 7
down 4
down 8
forward 2
forward 2
up 1
forward 8
down 5
forward 8
forward 4
up 1
forward 2
forward 2
forward 2
down 9
down 7
down 9
forward 9
forward 4
up 7
down 4
forward 9
forward 8
up 5
up 1
down 1
down 9
down 6
up 8
forward 2
forward 7
up 7
forward 7
forward 6
down 6
forward 8
up 6
forward 7
down 7
forward 4
forward 9
up 9
up 8
forward 8
forward 3
up 1
up 4
down 4
up 9
up 8
forward 6
down 2
down 2
up 4
forward 4
forward 1
down 8
forward 6
down 5
forward 6
down 8
up 1
forward 1
up 9
down 8
up 3
up 9
forward 9
forward 2
down 2
up 6
up 6
forward 8
up 3
down 3
forward 5
up 2
forward 1
forward 1
forward 8
down 4
forward 8
forward 7
down 8
forward 7
down 7
down 2
down 1
down 7
up 9
down 5
up 1
forward 7
down 5
down 9
down 2
down 8
down 4
forward 2
forward 2
forward 1
down 6
up 7
forward 2
down 1
down 5
forward 3
forward 8
down 4
up 2
up 9
up 7
forward 7
forward 4
up 8
up 3
up 4
forward 6
down 7
forward 7
up 6
down 9
up 6
forward 4
up 3
down 3
up 6
down 9
down 6
forward 7
forward 9
forward 2
down 6
up 3
up 9
forward 9
forward 8
up 4
up 5
forward 6
down 5
up 4
up 9
down 8
forward 5
up 5
forward 7
forward 6
down 8
down 5
down 2
up 5
down 8
forward 7
forward 7
up 6
forward 3
down 8
forward 5
forward 8
down 7
forward 6
down 2
forward 2
forward 8
down 4
forward 5
forward 7
forward 5
forward 8
forward 9
forward 6
down 6
up 7
down 9
forward 7
forward 1
up 2
forward 8
down 1
up 9
forward 7
down 2
up 2
forward 5
down 4
down 3
up 8
up 6
forward 3
up 4
forward 3
forward 1
forward 1
up 9
down 2
down 9
up 4
forward 4
forward 4
forward 2
forward 5
forward 9
forward 7
up 4
up 5
down 5
forward 9
down 1
forward 2
down 6
forward 9
down 4
down 2
forward 2
up 7
forward 7
forward 8
up 9
forward 3
up 1
down 5
forward 5
down 1
up 5
forward 4
forward 5
up 3
down 4
up 6
up 1
down 2
forward 6
down 8
up 9
down 7
forward 9
down 8
forward 3
forward 8
down 1
down 7
forward 6
up 6
down 1
down 5
forward 6
down 7
down 2
forward 6
forward 2
forward 8
forward 7
forward 2
down 7
up 2
down 7
forward 8
forward 8
forward 2
forward 4
down 1
down 6
down 1
down 4
down 4
down 2
down 7
up 5
up 5
down 1
forward 3
up 1
down 3
forward 9
forward 4
forward 7
down 4
down 4
down 2
forward 2
forward 1
forward 9
down 1
down 4
down 1
forward 4
up 8
forward 3
down 6
forward 5
forward 9
forward 1
up 8
down 7
down 8
forward 4
down 4
up 5
down 3
forward 3
down 6
down 1
down 9
forward 8
up 5
down 7
up 7
forward 3
up 5
up 7
down 4
up 2
down 2
down 8
up 6
down 4
up 1
down 8
down 4
forward 7
down 4
up 3
down 9
forward 3
up 4
up 1
up 5
down 4
forward 4
forward 4
down 2
down 3
down 4
forward 2
down 9
down 9
down 6
forward 5
forward 7
down 3
forward 2
up 8
down 6
down 8
down 2
up 9
down 1
forward 8
forward 1
forward 8
up 4
up 1
down 8
up 2
forward 5
down 3
forward 5
forward 4
forward 1
down 9
forward 2
forward 5
forward 4
forward 3
down 7
up 9
forward 7
up 8
forward 3
forward 3
down 5
forward 7
forward 5
down 4
forward 6
down 6
up 3
down 3
forward 7
forward 8
up 3
up 8
forward 8
up 4
forward 5
up 4
down 7
forward 4
down 8
down 6
forward 7
down 4
up 7
down 6
up 5
down 2
forward 7
down 7
up 3
up 3
down 3
down 5
forward 3
forward 5
forward 8
down 3
down 8
forward 3
down 1
forward 4
up 5
forward 8
up 1
up 4
down 4
forward 1
forward 6
up 7
up 1
up 7
down 5
forward 8
down 1
forward 1
forward 6
up 9
up 6
down 4
forward 5
down 1
forward 7
down 8
up 3
down 9
down 1
up 7
up 6
forward 8
down 9
down 4
forward 4
up 7
down 3
forward 5
forward 8
up 5
down 7
up 2
forward 3
forward 3
forward 4
down 1
forward 5
forward 7
up 7
forward 7
forward 1
forward 3
forward 9
down 3
forward 5
down 9
down 7
down 4
down 8
up 3
down 1
up 5
down 5
forward 2
down 6
down 5
forward 2
forward 6
down 6
up 6
down 8
up 1
forward 4
forward 2
forward 1
up 1
forward 5
forward 3
forward 7
down 9
forward 3
down 9
up 5
down 7
down 2
down 3
up 5
up 3
down 2
forward 4
forward 1
down 3
up 4
down 8
down 1
forward 6
down 3
forward 9
down 7
down 3
down 4
down 5
up 1
forward 8
forward 2
up 3
up 7
up 1
forward 3
forward 9
up 5
forward 6
down 8
down 9
down 5
forward 6
forward 3
forward 8
forward 7
forward 9
forward 2
up 9
forward 8
down 2
down 6
down 9
down 5
forward 1
down 7
forward 2
down 4
down 1
up 1
down 2
forward 5
forward 8
down 9
up 6
forward 8
forward 3
up 6
up 2
forward 8
down 8
up 1
down 6
down 2
down 6
forward 5
forward 6
down 4
forward 1
down 4
up 7
forward 4
up 1
forward 9
forward 7
up 3
down 7
down 4
forward 3
forward 8
forward 6
forward 6
up 1
up 2
up 8
down 7
forward 8
down 5
forward 6
down 1
down 9
down 2
forward 6
up 3
down 5
down 6
forward 1
forward 2
down 3
forward 8
forward 1
up 5
down 8
down 4
up 9
up 2
forward 7
forward 9
up 8
up 6
forward 1
down 7
up 1
down 3
forward 2
forward 3
down 3
down 2
forward 3
down 7
forward 3
forward 7
forward 7
down 8
down 4
forward 3
forward 4
down 7
down 9
down 4
down 2
forward 7
up 8
down 4
down 3
forward 9
down 5
up 6
up 2
down 5
down 6
forward 2
forward 8
down 1
forward 6
up 7
down 6
forward 4
down 2
down 5
down 9
forward 7
up 4
forward 9
up 7
down 4
down 6
up 9
forward 1
up 7
down 5
forward 3
forward 3
down 7
down 1
down 7
down 7
down 1
forward 8
forward 9
forward 8
down 9
down 8
down 5
down 3
forward 4
forward 1
down 1
forward 1
down 7
forward 7
forward 3
down 8
forward 3
forward 9
forward 8
down 7
forward 8
down 2
up 5
forward 7
forward 4
down 2
up 6
up 8
forward 7
down 9
up 3
forward 4
up 9
up 5
up 5
up 6
down 4
down 5
up 5
forward 7
forward 6
down 4
forward 5
forward 4
up 7
forward 8
down 2
forward 1
down 9
down 8
forward 7
down 7
down 1
forward 9
down 7
forward 6
down 2
up 9
forward 1
up 9
down 3
up 9
down 1
forward 1
down 1
up 6
down 8
up 2
down 3
forward 1
down 4
up 5
down 5
down 4
forward 5
forward 4
down 9
up 7
down 7
forward 7
forward 6
forward 8
down 8
forward 8
down 1
down 1
down 8
down 2
up 2
up 1
forward 5
down 1
up 5
up 2
down 6
up 8
forward 5
down 8
down 1
up 5
down 1
forward 4
down 6
down 4
forward 2
forward 2
down 1
up 4
up 8
down 6
down 2
forward 5
forward 8
forward 7
down 5
down 7
down 3
forward 6
down 3
down 3
forward 6
forward 6
forward 6
up 7
forward 1
down 5
down 2
up 8
forward 6
down 7
down 6
forward 1
up 5
down 4
up 9
forward 3
up 3
forward 9
forward 9
forward 7
forward 5
down 9
forward 1
forward 6
up 8
down 7
forward 9
forward 5
up 4
down 8
forward 8
forward 4
down 9
up 2
forward 5
forward 8
down 8
down 9
down 9
forward 4
forward 8
down 5
down 5
forward 5
forward 5
up 9
up 7
forward 3
up 4
down 8
up 6
up 6
down 4
down 3
forward 2
forward 9
down 4
down 2
forward 4
up 9
forward 1
down 8
down 9
down 9
down 3
forward 1
down 5
up 9
forward 6
up 4
forward 2
forward 2
forward 4
down 9
up 5
up 1
down 6
forward 7
down 8
forward 4
forward 9
up 9
up 4
down 5
down 3
forward 2
down 8
down 6
forward 3
down 2
forward 6
up 2
forward 6
down 7
up 4
forward 1
forward 4
up 4
forward 6
forward 8
down 7
down 6
up 7
down 2
down 4
down 5
forward 1
up 4
forward 8
forward 6
down 8
up 5
up 2
up 9
up 5
forward 6
down 4
up 3
down 8
down 6
down 2
up 3
up 5
down 1
forward 9
up 8
up 2
down 3
forward 6
down 1
forward 5
down 3
up 1
up 2
down 5
down 7
forward 8
down 8
up 9
forward 3
down 8
down 8
forward 1
down 4
down 4
forward 3
up 6
down 3
down 7
down 7
up 1
forward 3
forward 2`
  .split(/\n/)
  .map((line) => {
    let [direction, distance] = line.split(" ");
    return { direction, distance: parseInt(distance) };
  });

let smallInput = `forward 5
down 5
forward 8
up 3
down 8
forward 2
  `
  .split(/\n/)
  .map((line) => {
    let [direction, distance] = line.split(" ");
    return { direction, distance: parseInt(distance) };
  });

let { depth, horizontal } = input.reduce(
  (acc, move) => {
    let change;
    switch (move.direction) {
      case "down":
        change = { aim: acc.aim + move.distance };
        break;
      case "up":
        change = { aim: acc.aim - move.distance };
        break;
      case "forward":
        change = {
          horizontal: acc.horizontal + move.distance,
          depth: acc.depth + acc.aim * move.distance,
        };
        break;
    }
    return { ...acc, ...change };
  },
  { horizontal: 0, depth: 0, aim: 0 }
);

console.log(depth * horizontal);
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