defmodule Superintelligence.DeepSupervisor do
  use Supervisor

  def start_link(depth) when is_integer(depth) and depth >= 0 do
    Supervisor.start_link(__MODULE__, depth, name: via_tuple(depth))
  end

  @impl true
  def init(0) do
    # At depth 0, we spawn a worker instead of another supervisor
    children = [
      {Superintelligence.Worker, []}
    ]

    Supervisor.init(children, strategy: :one_for_one)
  end

  @impl true
  def init(depth) when depth > 0 do
    # Spawn a child supervisor at depth - 1
    children = [
      %{
        id: :child_supervisor,
        start: {Superintelligence.DeepSupervisor, :start_link, [depth - 1]},
        type: :supervisor
      }
    ]

    Supervisor.init(children, strategy: :one_for_one)
  end

  defp via_tuple(depth) do
    {:via, Registry, {Superintelligence.Registry, {:supervisor, depth}}}
  end
end