defmodule DynS.Application do
  # See https://hexdocs.pm/elixir/Application.html
  # for more information on OTP Applications
  @moduledoc false

  use Application

  def start(_type, _args) do
    # See https://hexdocs.pm/elixir/Supervisor.html
    # for proper instructions
    Supervisor.start_link(
      [
        # Add this exmpla worker using `mix aqua add otp.gs DynS.Worker`
        # DynS.Worker
        DynS.Supervisor
      ],
      strategy: :one_for_one,
      name: DynS.Application
    )
  end
end

defmodule MyWorker do
  use GenServer, restart: :transient

  def start_link(arg) do
    GenServer.start_link(__MODULE__, arg)
  end

  def handle_info(:test, state) do
    IO.inspect(:test)
    {:stop, :normal, state}
  end
end

defmodule DynS.Supervisor do
  use DynamicSupervisor

  def start_link(arg) do
    DynamicSupervisor.start_link(__MODULE__, arg, name: __MODULE__)
  end

  def init(_arg) do
    DynamicSupervisor.init(
      strategy: :one_for_one
    )
  end

  def start_child(name) do
    # If MyWorker is not using the new child specs, we need to pass a map:
    # spec = %{id: MyWorker, start: {MyWorker, :start_link, [foo, bar, baz]}}
    spec = {MyWorker, name}
    DynamicSupervisor.start_child(__MODULE__, spec)
  end
end