defmodule Localiser.Localisation.Room.Supervisor do
  use DynamicSupervisor

  alias Localiser.Domain.Rooms
  alias Localiser.Localisation.Room.Server

  def start_link(floor) do
    case DynamicSupervisor.start_link(__MODULE__, :ok, name: via(floor.id)) do
      {:ok, pid} ->
        seed_rooms(floor.id)
        {:ok, pid}

      error ->
        error
    end
  end

  def via(floor_id) do
    {:via, Registry, {Localiser.Registry, {:room_supervisor, floor_id}}}
  end

  @impl true
  def init(:ok) do
    DynamicSupervisor.init(strategy: :one_for_one)
  end

  def start_room_server(floor_id, room) do
    child_spec = %{
      id: {Server, room.id},
      start: {Server, :start_link, [room]},
      restart: :transient
    }

    DynamicSupervisor.start_child(via(floor_id), child_spec)
  end

  defp seed_rooms(floor_id) do
    Rooms.list_rooms_for_floor(floor_id)
    |> Enum.each(&start_room_server(floor_id, &1))
  end
end