defmodule HomelabDashboardWeb.PageController do
  use HomelabDashboardWeb, :controller
  import Bitwise

  def home(conn, _params) do
    {public_services, internal_services} = HomelabDashboard.ServicesSync.get_services()

    render(conn, :home,
      public_services: public_services,
      internal_services: internal_services,
      show_internal: internal_network?(conn.remote_ip)
    )
  end

  defp internal_network?({127, _, _, _}), do: true
  defp internal_network?({10, _, _, _}), do: true
  defp internal_network?({192, 168, _, _}), do: true
  defp internal_network?({172, b, _, _}) when b in 16..31, do: true
  defp internal_network?({0, 0, 0, 0, 0, 0, 0, 1}), do: true
  defp internal_network?({0, 0, 0, 0, 0, 65535, ab, cd}) do
    internal_network?({ab >>> 8, ab &&& 0xFF, cd >>> 8, cd &&& 0xFF})
  end
  defp internal_network?(_), do: false
end