if Code.ensure_loaded?(Jason) do
  defmodule ScrapyCloudEx.Decoders.Default do
    @moduledoc """
    A default implementation of the `ScrapyCloudEx.Decoder` behaviour.

    Only decodes JSON values data, all other return types
    are simply forwarded without transformation.

    Depends on `Jason`.
    """

    alias ScrapyCloudEx.Decoder

    @behaviour Decoder

    @impl Decoder

    @spec decode(String.t(), atom) :: {:ok, any} | ScrapyCloudEx.tagged_error()

    def decode(body, :json) do
      Jason.decode(body)
    end

    def decode(body, _), do: {:ok, body}
  end
else
  defmodule ScrapyCloudEx.Decoders.Default do
    @moduledoc false

    @behaviour ScrapyCloudEx.Decoder

    def decode(_, _) do
      raise RuntimeError,
        message: "Jason is required to use #{__MODULE__}, refer to instructions in README"
    end
  end
end