defmodule OPQ.Options do
  @moduledoc """
  Options for configuring OPQ.
  """

  @worker OPQ.Worker
  @workers 10
  @interval 0
  @timeout 5_000

  @doc """
  ## Examples

      iex> Options.assign_defaults([]) |> Keyword.get(:workers)
      10

      iex> Options.assign_defaults([workers: 4]) |> Keyword.get(:workers)
      4
  """
  def assign_defaults(opts) do
    Keyword.merge(
      [
        worker: worker(),
        workers: workers(),
        interval: interval(),
        timeout: timeout()
      ],
      opts
    )
  end

  defp worker(), do: Application.get_env(:opq, :worker, @worker)
  defp workers(), do: Application.get_env(:opq, :workers, @workers)
  defp interval(), do: Application.get_env(:opq, :interval, @interval)
  defp timeout(), do: Application.get_env(:opq, :timeout, @timeout)
end