Day 22: Monkey Map

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R35L49L18R9R41R13R27R9L30L50L10R8R2R48R50L47R34R25L5L23L16R37L37L31L8L21L45L18L10L9R9R9L46L2L43L32R11R30L46L23R26R3R26L35L46R6R4R2R17R30R31R9L48R45L38R27L48L9R15L29R43R42L8L17R14R49L16L1R26R9R28R20L10R18R28R47L50R27L41R34R18L39L16L28L38R42L26L41L44R49L17L22L30R34L9L30L29R11R13R16R5R18R6R14L21L26R50R49R41R25R47R18R2R21L20R11R6R3R33L44L34L38R7L37R6R6R44L18L40L18R24R32R6L38R38L18R10R39R34L12R25L45R20L38L27R13L48R37R45R45L6R29R15L36R16R16R27R19L33L44R7R29L42R42L20R26L12R47L23L19R47L47R5R30R48R46L8R33L44L8R22R42R17R24L39L35L28L41L50L42R23L18L17R43R17L14R25L32L14L36L39R46L12R4L15R44L11L32R38R11L6L7L30L7R37L14R6L37L20R32L23L32L39
"""

Section

defmodule D22 do
  @facings [:r, :d, :l, :u]

  def parse_input(input) do
    [raw_map, path] = input |> String.split("\n\n", trim: true)

    {
      parse_map(raw_map),
      parse_path(path)
    }
  end

  def parse_map(raw_map) do
    map =
      raw_map
      |> String.split("\n", trim: true)
      |> Enum.map(&(String.codepoints(&1) |> Enum.with_index(1)))
      |> Enum.with_index(1)

    for {row, j} <- map, {point, i} <- row, point != " ", into: %{} do
      {{i, j}, point}
    end
  end

  def parse_path(raw_path) do
    raw_path
    |> String.trim_trailing()
    |> String.to_charlist()
    |> Enum.chunk_by(&amp;(&amp;1 in [?R, ?L]))
    |> Enum.map(&amp;step_parse/1)
  end

  def step_parse(step) when step in ['R', 'L'], do: List.to_string(step)
  def step_parse(step), do: List.to_integer(step)

  def find_start(map) do
    Enum.filter(map, fn {{_i, j}, v} -> j == 1 and v == "." end)
    |> Enum.min_by(&amp;(elem(&amp;1, 0) |> elem(0)))
  end

  def wrap(map, {i, j}, :r) do
    {next_ij, _} =
      Enum.filter(map, fn {{_i, mj}, _v} -> mj == j end)
      |> Enum.min_by(&amp;(elem(&amp;1, 0) |> elem(0)))

    case Map.get(map, next_ij) do
      "#" -> {i, j}
      "." -> next_ij
    end
  end

  def wrap(map, {i, j}, :l) do
    {next_ij, _} =
      Enum.filter(map, fn {{_i, mj}, _v} -> mj == j end)
      |> Enum.max_by(&amp;(elem(&amp;1, 0) |> elem(0)))

    case Map.get(map, next_ij) do
      "#" -> {i, j}
      "." -> next_ij
    end
  end

  def wrap(map, {i, j}, :u) do
    {next_ij, _} =
      Enum.filter(map, fn {{mi, _mj}, _v} -> mi == i end)
      |> Enum.max_by(&amp;(elem(&amp;1, 0) |> elem(1)))

    case Map.get(map, next_ij) do
      "#" -> {i, j}
      "." -> next_ij
    end
  end

  def wrap(map, {i, j}, :d) do
    {next_ij, _} =
      Enum.filter(map, fn {{mi, _mj}, _v} -> mi == i end)
      |> Enum.min_by(&amp;(elem(&amp;1, 0) |> elem(1)))

    case Map.get(map, next_ij) do
      "#" -> {i, j}
      "." -> next_ij
    end
  end

  def step(map, {i, j}, :r) do
    case Map.get(map, {i + 1, j}) do
      "#" -> {i, j}
      "." -> {i + 1, j}
      nil -> wrap(map, {i, j}, :r)
    end
  end

  def step(map, {i, j}, :l) do
    case Map.get(map, {i - 1, j}) do
      "#" -> {i, j}
      "." -> {i - 1, j}
      nil -> wrap(map, {i, j}, :l)
    end
  end

  def step(map, {i, j}, :u) do
    case Map.get(map, {i, j - 1}) do
      "#" -> {i, j}
      "." -> {i, j - 1}
      nil -> wrap(map, {i, j}, :u)
    end
  end

  def step(map, {i, j}, :d) do
    case Map.get(map, {i, j + 1}) do
      "#" -> {i, j}
      "." -> {i, j + 1}
      nil -> wrap(map, {i, j}, :d)
    end
  end

  def turn(facing, direction) do
    d = if(direction == "R", do: &amp;Kernel.+(&amp;1, 1), else: &amp;Kernel.-(&amp;1, 1))

    Enum.find_index(@facings, &amp;(&amp;1 == facing))
    |> then(&amp;d.(&amp;1))
    |> rem(4)
    |> then(&amp;Enum.at(@facings, &amp;1))
  end

  def walk(map, {i, j}, facing, steps) do
    Enum.reduce(1..steps, {i, j}, fn _, accu ->
      step(map, accu, facing)
    end)
  end

  def navigate(map, start, path) do
    Enum.reduce(path, {start, :r}, fn
      steps, {ij, facing} when is_integer(steps) ->
        {walk(map, ij, facing, steps), facing}

      direction, {point, facing} when not is_integer(facing) ->
        IO.inspect({point, facing})
        {point, turn(facing, direction)}
    end)
  end
end

{map, path} = D22.parse_input(puzzle_input)
start = D22.find_start(map) |> elem(0)

# D22.walk(map, elem(start, 0), :r, 10)
D22.navigate(map, start, path)

164 * 1000 + 3 * 4 + 2