opq

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