package aoc.direction

import aoc._

object Dir:
  val dx = Array(-1, 0, 1, 0)
  val dy = Array(0, 1, 0, -1)
import Dir._
enum Dir:
  case Up, Right, Down, Left
  def apply(x: Int, y: Int, count: Int = 1) =
    val k = this.ordinal
    (x + count * dx(k), y + count * dy(k))
  def long(x: Long, y: Long, count: Long = 1) =
    val k = this.ordinal
    (x + count * dx(k), y + count * dy(k))

  def left = Dir.fromOrdinal((ordinal + 3) % 4)
  def right = Dir.fromOrdinal((ordinal + 1) % 4)

trait DirParser extends CommonParser:
  val dir = 'U' ^^^ Up | 'D' ^^^ Down | 'L' ^^^ Left | 'R' ^^^ Right