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

#include "framebuffer.h"
#include "display/display.h"
#include "assert/assert.h"
#include "util/memory.h"

framebuffer_t FRAMEBUFFER_BACKBUFFER = {0};
const framebuffer_t *FRAMEBUFFER_BOUND = &FRAMEBUFFER_BACKBUFFER;

errorret_t frameBufferInitBackBuffer() {
  memoryZero(&FRAMEBUFFER_BACKBUFFER, sizeof(framebuffer_t));
  errorChain(frameBufferPlatformInitBackBuffer());
  FRAMEBUFFER_BOUND = &FRAMEBUFFER_BACKBUFFER;
  errorOk();
}

errorret_t frameBufferBind(framebuffer_t *framebuffer) {
  if(framebuffer == NULL) {
    frameBufferBind(&FRAMEBUFFER_BACKBUFFER);
    FRAMEBUFFER_BOUND = &FRAMEBUFFER_BACKBUFFER;
    errorOk();
  }

  errorChain(frameBufferPlatformBind(framebuffer));
  FRAMEBUFFER_BOUND = framebuffer;
  errorOk();
}

uint32_t frameBufferGetWidth(const framebuffer_t *framebuffer) {
  return frameBufferPlatformGetWidth(framebuffer);
}

uint32_t frameBufferGetHeight(const framebuffer_t *framebuffer) {
  return frameBufferPlatformGetHeight(framebuffer);
}

float_t frameBufferGetAspect(const framebuffer_t *framebuffer) {
  #ifdef frameBufferPlatformGetAspect
    return frameBufferPlatformGetAspect(framebuffer);
  #endif
  
  uint32_t width = frameBufferGetWidth(framebuffer);
  uint32_t height = frameBufferGetHeight(framebuffer);
  if(height == 0) return 1.0f; // Avoid divide by zero, just return 1:1 aspect.
  return (float_t)width / (float_t)height;
}

void frameBufferClear(const uint8_t flags, const color_t color) {
  frameBufferPlatformClear(flags, color);
}

#ifdef DUSK_DISPLAY_SIZE_DYNAMIC
  errorret_t frameBufferInit(
    framebuffer_t *fb,
    const uint32_t width,
    const uint32_t height
  ) {
    assertNotNull(fb, "Framebuffer cannot be NULL");
    assertTrue(width > 0 && height > 0, "W/H must be greater than 0");

    memoryZero(fb, sizeof(framebuffer_t));
    errorChain(frameBufferPlatformInit(fb, width, height));
    errorOk();
  }
  
  errorret_t frameBufferDispose(framebuffer_t *framebuffer) {
    assertNotNull(framebuffer, "Framebuffer cannot be NULL");
    errorChain(frameBufferPlatformDispose(framebuffer));
    errorOk();
  }
#endif