defmodule Absinthe.Relay.Schema do
  @moduledoc """
  Used to extend a schema with Relay-specific macros and types.

  See `Absinthe.Relay`.
  """

  defmacro __using__(flavor) when is_atom(flavor) do
    do_using(flavor, [])
  end

  defmacro __using__(opts) when is_list(opts) do
    opts
    |> Keyword.get(:flavor, [])
    |> do_using(opts)
  end

  defp do_using(flavor, opts) do
    quote do
      @pipeline_modifier unquote(__MODULE__)
      use Absinthe.Relay.Schema.Notation, unquote(flavor)
      import_types Absinthe.Relay.Connection.Types

      def __absinthe_relay_global_id_translator__ do
        Keyword.get(unquote(opts), :global_id_translator)
      end
    end
  end

  def pipeline(pipeline) do
    pipeline
    |> Absinthe.Pipeline.insert_before(
      Absinthe.Phase.Schema.ApplyDeclaration,
      __MODULE__.Phase
    )
  end
end