defmodule Rocket.Stringer do

  def sanitize_phone(ph) do
    ph = Regex.replace(~r/[^0-9]/,ph,"")
    case Regex.run(~r/\d{5,10}$/,ph) do
      [phone] -> phone
      _ -> nil
    end
  end


  def format_phone(ph) do
    ph = sanitize_phone(ph)
    case String.length(ph) do
      10 -> "(#{String.slice(ph,0,3)})#{String.slice(ph,3,3)}-#{String.slice(ph,6,4)}"
       7 -> "#{String.slice(ph,0,3)}-#{String.slice(ph,3,4)}"
       _ -> ph
    end
  end

end