defmodule Podbox.Download.Supervisor do
  @moduledoc """
  A Supervision tree for managing the download system.
  """

  use Supervisor
  alias Podbox.Download

  @doc false
  @spec start_link(Keyword.t()) :: Supervisor.on_start()
  def start_link(opts), do: Supervisor.start_link(__MODULE__, opts, name: __MODULE__)

  @doc false
  @impl true
  def init(_opts) do
    [
      {Finch, name: Download.Finch},
      Download.ConnectivityMonitor
    ]
    |> maybe_append(Download.Broadway, start_broadway?())
    |> Supervisor.init(strategy: :one_for_one)
  end

  defp start_broadway? do
    :podbox
    |> Application.get_env(Podbox.Download, [])
    |> Keyword.get(:start_broadway?, true)
  end

  defp maybe_append(children, _child_spec, falsy) when falsy in [nil, false], do: children
  defp maybe_append(children, child_spec, _), do: Enum.concat(children, [child_spec])
end