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

#pragma once
#include "error/error.h"
#include "display/texture/texture.h"
#include "display/shader/shaderplatform.h"

#ifndef shaderInitPlatform
  #error "shaderInitPlatform must be defined to use shader.h"
#endif
#ifndef shaderBindPlatform
  #error "shaderBindPlatform must be defined to use shader.h"
#endif
#ifndef shaderSetMatrixPlatform
  #error "shaderSetMatrixPlatform must be defined to use shader.h"
#endif
#ifndef shaderDisposePlatform
  #error "shaderDisposePlatform must be defined to use shader.h"
#endif

typedef union shadermaterial_u shadermaterial_t;
typedef shaderplatform_t shader_t;
typedef shaderdefinitionplatform_t shaderdefinition_t;

/**
 * Initializes a shader. This is platform dependant.
 * 
 * @param shader Shader to initialize
 * @param def Definition of the shader to initialize with.
 * @return Error if failure, otherwise errorOk
 */
errorret_t shaderInit(shader_t *shader, const shaderdefinition_t *def);

/**
 * Binds a shader. This is platform dependant.
 * 
 * @param shader Shader to bind
 * @return Error if failure, otherwise errorOk
 */
errorret_t shaderBind(shader_t *shader);

/**
 * Sets a matrix uniform in the shader. This is platform dependant.
 * 
 * @param shader Shader to set the matrix in
 * @param name Name of the uniform to set
 * @param matrix Matrix to set
 * @return Error if failure, otherwise errorOk
 */
errorret_t shaderSetMatrix(
  shader_t *shader,
  const char_t *name,
  mat4 matrix
);

/**
 * Sets a texture uniform in the shader. This is platform dependant.
 * 
 * @param shader Shader to set the texture in
 * @param name Name of the uniform to set
 * @param texture Texture to set
 * @return Error if failure, otherwise errorOk
 */
errorret_t shaderSetTexture(
  shader_t *shader,
  const char_t *name,
  texture_t *texture
);

/**
 * Sets a color uniform in the shader. This is platform dependant.
 * 
 * @param shader Shader to set the color in
 * @param name Name of the uniform to set
 * @param color Color to set
 * @return Error if failure, otherwise errorOk
 */
errorret_t shaderSetColor(
  shader_t *shader,
  const char_t *name,
  color_t color
);

/**
 * Sets a material's properties in the shader. This is platform dependant.
 * the definition's upload function pointer.
 *
 * @param shader The shader to upload material properties to.
 * @param material The material data to upload.
 * @return Error if failure, otherwise errorOk.
 */
errorret_t shaderSetMaterial(
  shader_t *shader,
  const shadermaterial_t *material
);

/**
 * Disposes of a shader. This is platform dependant.
 *
 * @param shader Shader to dispose
 * @return Error if failure, otherwise errorOk
 */
errorret_t shaderDispose(shader_t *shader);