#include "background.h"
#include "constants.h"
#include <raymath.h>
#include <assert.h>
#include <stdlib.h>

void AddBackground(const char* backgroundTextureName) {
  Entity e = {0};
  e.type = Background_Entity;

  e.flags |= ENTITY_VISIBLE;
  e.drawLayer = Background_Layer;

  e.position = (Vector2) {0.0f, 0.0f};

  Asset* backgroundTextureAsset =
    GetMatchingAssetWithType(backgroundTextureName, Texture_Asset);

  if (backgroundTextureAsset == NULL) {

    TraceLog(LOG_ERROR,
             "Failed to create background from texture asset: %s, asset not found",
             backgroundTextureName
             );
    exit(EXIT_FAILURE);

  }

  Texture2D backgroundTexture = backgroundTextureAsset->texture;
  const float backgroundSizeScale = (float)WINDOW_HEIGHT / backgroundTexture.height;

  Vector2 backgroundBounds =
    Vector2Scale((Vector2) {backgroundTexture.width, backgroundTexture.height}, backgroundSizeScale);

  e.destRect = (Rectangle) {
    .width = backgroundBounds.x,
    .height = backgroundBounds.y
  };
  e.texture = backgroundTexture;

  AddEntity(&e);
}