defmodule Ash.Registry.ResourceValidations.Transformers.EnsureNoEmbeds do
  @moduledoc """
  Ensures that all resources for a given registry are not embeds.
  """
  use Spark.Dsl.Transformer
  alias Spark.Dsl.Transformer

  @impl true
  def after_compile?, do: true

  @impl true
  def transform(dsl) do
    dsl
    |> Transformer.get_entities([:entries])
    |> Enum.map(& &1.entry)
    |> Enum.filter(&Ash.Resource.Info.embedded?/1)
    |> case do
      [] ->
        {:ok, dsl}

      rejected ->
        {:error,
         "Embedded resources should not be listed in the registry. Please remove #{inspect(rejected)} from the registry."}
    end
  end
end