defmodule Retort.Server.Pool do
  @moduledoc """
  Supervises multiple workers with the same configuration for `Retort.Server.Generic`
  """

  use Supervisor

  alias Retort.Server

  # Callbacks

  @doc """
  Starts `count` `Retort.Server.Generic` workers passing `worker_state`
  """
  @spec init([pos_integer | Server.Generic.t()]) :: {:ok, {:supervisor.sup_flags(), [Supervisor.Spec.spec()]}}
  def init([count, worker_state = %Server.Generic{}]) when is_integer(count) do
    0..(count - 1)
    |> Enum.map(
      &worker(
        Retort.Server.Generic,
        [worker_state],
        id: {Retort.Server.Generic, &1}
      )
    )
    |> supervise(strategy: :one_for_one)
  end

  ## Supervisor.Spec.supervisor Callbacks

  @doc """
  Starts supervising the pool of workers
  """
  @spec start_link([non_neg_integer | Server.Generic.t()], Supervisor.options()) :: Supervisor.on_start()
  def start_link(arg = [count, %Server.Generic{}], supervisor_options \\ []) when is_integer(count) do
    Supervisor.start_link(__MODULE__, arg, supervisor_options)
  end
end