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

#pragma once
#include "rpg/overworld/worldpos.h"

typedef enum {
  ENTITY_DIR_UP = ENTITY_DIR_NORTH,
  ENTITY_DIR_DOWN = ENTITY_DIR_SOUTH,
  ENTITY_DIR_LEFT = ENTITY_DIR_WEST,
  ENTITY_DIR_RIGHT = ENTITY_DIR_EAST,
} entitydir_t;

/**
 * Gets the opposite direction of a given direction.
 * 
 * @param dir The direction to get the opposite of.
 * @return entitydir_t The opposite direction.
 */
entitydir_t entityDirGetOpposite(const entitydir_t dir);

/**
 * Asserts a given direction is valid.
 * 
 * @param dir The direction to validate.
 * @param msg The message to display if the assertion fails.
 */
#define assertValidEntityDir(dir, msg) \
  assertTrue( \
    (dir) == ENTITY_DIR_NORTH || \
    (dir) == ENTITY_DIR_EAST || \
    (dir) == ENTITY_DIR_SOUTH || \
    (dir) == ENTITY_DIR_WEST, \
    msg \
  )

/**
 * Gets the relative x and y offsets for a given direction.
 * 
 * @param dir The direction to get offsets for.
 * @param relX Pointer to store the relative x offset.
 * @param relY Pointer to store the relative y offset.
 */
void entityDirGetRelative(
  const entitydir_t dir, worldunits_t *relX, worldunits_t *relY
);