/**
 * Copyright (c) 2025 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "entitydir.h"
#include "assert/assert.h"

entitydir_t entityDirGetOpposite(const entitydir_t dir) {
  switch(dir) {
    case ENTITY_DIR_NORTH: return ENTITY_DIR_SOUTH;
    case ENTITY_DIR_SOUTH: return ENTITY_DIR_NORTH;
    case ENTITY_DIR_EAST:  return ENTITY_DIR_WEST;
    case ENTITY_DIR_WEST:  return ENTITY_DIR_EAST;
    default: return dir;
  }
}

void entityDirGetRelative(
  const entitydir_t from,
  worldunits_t *outX,
  worldunits_t *outY
) {
  assertValidEntityDir(from, "Invalid direction provided");
  assertNotNull(outX, "Output X pointer cannot be NULL");
  assertNotNull(outY, "Output Y pointer cannot be NULL");

  switch(from) {
    case ENTITY_DIR_NORTH:
      *outX = 0;
      *outY = -1;
      break;

    case ENTITY_DIR_EAST:
      *outX = 1;
      *outY = 0;
      break;

    case ENTITY_DIR_SOUTH:
      *outX = 0;
      *outY = 1;
      break;

    case ENTITY_DIR_WEST:
      *outX = -1;
      *outY = 0;
      break;
  }
}