local _sprites = {}

function Sprite.register(sprite_data)
  if not sprite_data or not sprite_data.id then
    trace("Error: Invalid sprite object registered (missing id)!")
    return
  end
  if _sprites[sprite_data.id] then
    trace("Warning: Overwriting sprite with id: " .. sprite_data.id)
  end
  _sprites[sprite_data.id] = sprite_data
end

function Sprite.show(id, x, y, colorkey, scale, flip_x, flip_y, rot)
  local sprite_data = _sprites[id]
  if not sprite_data then
    trace("Error: No sprite found with id: " .. id)
    return
  end

  -- Use provided parameters, or fall back to sprite_data, then to defaults
  colorkey = colorkey or sprite_data.colorkey or 0 -- Default colorkey (transparent)
  scale = scale or sprite_data.scale or 1         -- Default scale
  flip_x = flip_x or sprite_data.flip_x or 0       -- Default flip_x (no flip)
  flip_y = flip_y or sprite_data.flip_y or 0       -- Default flip_y (no flip)
  rot = rot or sprite_data.rot or 0               -- Default rot (no rotation)

  if sprite_data.sprites then -- Complex sprite
    for i = 1, #sprite_data.sprites do
      local sub_sprite = sprite_data.sprites[i]
      spr(
        sub_sprite.s,
        x + (sub_sprite.x_offset or 0),
        y + (sub_sprite.y_offset or 0),
        sub_sprite.colorkey or colorkey,
        sub_sprite.scale or scale,
        sub_sprite.flip_x or flip_x,
        sub_sprite.flip_y or flip_y,
        sub_sprite.rot or rot
      )
    end
  else -- Simple sprite
    spr(sprite_data.s, x, y, colorkey, scale, flip_x, flip_y, rot)
  end
end