/**
 * Copyright (c) 2026 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#pragma once
#include "entity/entitybase.h"

typedef enum {
  ENTITY_CAMERA_PROJECTION_TYPE_PERSPECTIVE,
  ENTITY_CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED,
  ENTITY_CAMERA_PROJECTION_TYPE_ORTHOGRAPHIC
} entitycameraprojectiontype_t;

typedef struct {
  union {
    struct {
      float_t fov;
    } perspective;

    struct {
      float_t left;
      float_t right;
      float_t top;
      float_t bottom;
    } orthographic;
  };

  float_t nearClip;
  float_t farClip;
  entitycameraprojectiontype_t projType;  
} entitycamera_t;

/**
 * Initializes an entity camera component.
 * 
 * @param ent The entity ID.
 * @param comp The component ID.
 */
void entityCameraInit(const entityid_t ent, const componentid_t comp);

/**
 * Renders out the projection matrix for the given camera.
 *
 * @param ent The entity ID.
 * @param comp The component ID.
 * @param out The output projection matrix.
 */
void entityCameraGetProjection(
  const entityid_t ent,
  const componentid_t comp,
  mat4 out
);

/**
 * Returns the entity ID of the first active camera, or ENTITY_COUNT_MAX if 
 * none are active.
 */
entityid_t entityCameraGetCurrent(void);

/**
 * Gets the camera's horizontal forward direction (XZ plane) from its position
 * component. Automatically finds the position component on the entity.
 *
 * @param entityId The camera entity ID.
 * @param out Output vec2: {forwardX, forwardZ} normalized.
 */
void entityCameraGetForward(const entityid_t entityId, vec2 out);

/**
 * Gets the camera's horizontal right direction (XZ plane) from its position
 * component. Automatically finds the position component on the entity.
 *
 * @param entityId The camera entity ID.
 * @param out Output vec2: {rightX, rightZ} normalized.
 */
void entityCameraGetRight(const entityid_t entityId, vec2 out);