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

#pragma once
#include "dusk.h"
#include "display/color.h"
#include "display/camera/cameraplatform.h"

#ifndef cameraPushMatrixPlatform
  #error "cameraPushMatrixPlatform must be defined"
#endif


typedef enum {
  CAMERA_VIEW_TYPE_MATRIX,
  CAMERA_VIEW_TYPE_LOOKAT,
  CAMERA_VIEW_TYPE_2D,
  CAMERA_VIEW_TYPE_LOOKAT_PIXEL_PERFECT
} cameraviewtype_t;

typedef struct camera_s {
  union {
    mat4 view;

    struct {
      vec3 position;
      vec3 target;
      vec3 up;
    } lookat;

    struct {
      vec3 offset;
      vec3 target;
      vec3 up;
      float_t pixelsPerUnit;
    } lookatPixelPerfect;

    struct {
      vec2 position;
      float_t zoom;
    } _2d;
  };

  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;
  
  cameraprojectiontype_t projType;
  cameraviewtype_t viewType;
} camera_t;

/**
 * Initializes a camera to default values. This calls cameraInitPerspective.
 */
void cameraInit(camera_t *camera);

/**
 * Initializes a camera for perspective projection.
 */
void cameraInitPerspective(camera_t *camera);

/**
 * Initializes a camera for orthographic projection.
 */
void cameraInitOrthographic(camera_t *camera);

/**
 * Gets the projection matrix for a camera.
 * 
 * @param camera Camera to get the projection matrix for
 * @param dest Matrix to store the projection matrix in
 */
void cameraGetProjectionMatrix(camera_t *camera, mat4 dest);

/**
 * Gets the view matrix for a camera.
 * 
 * @param camera Camera to get the view matrix for
 * @param dest Matrix to store the view matrix in
 */
void cameraGetViewMatrix(camera_t *camera, mat4 dest);