defmodule DatoCMS.Image do
  @extra_attributes %{ixlib: "rb-1.1.0", auto: "compress,format"}

  @doc """
  Accepts a chain of attributes to be converted to params:

  ```
  dato_image_url(img, ch: "Width,DPR", width: 200, ...)
  ```
  """
  def url_for(image, attributes \\ %{}, site \\ nil) do
    all = Map.merge(@extra_attributes, attributes)
    domain(site) <> image.path <> "?" <> URI.encode_query(all)
  end

  defp domain(site) do
    site = site || repo_site()
    "https://" <> site.data.attributes.imgix_host
  end

  defp repo_site() do
    DatoCMS.Repo.site!()
  end
end