simple module that helps divy up cards

BlackjackAssist.exs

defmodule BlackjackAssist do
  @suits ~w(hearts clubs spades diamonds)
  @values ~w(A 2 3 4 5 6 7 8 9 10 J Q K)

  def draw_card do
    {Enum.random(@suits), Enum.random(@values)}
  end

  def draw_card({:reshuffle}) do
    draw_card
  end

  def draw_card(cards) when is_tuple(cards) do
    case draw_card do
      card when card == cards ->
        draw_card(cards)
      card ->
        List.insert_at([cards], -1, card)
    end
  end
  
  def draw_card(cards) when is_list(cards) and length(cards) == 52 do
    {:reshuffle}
  end

  def draw_card(cards) when is_list(cards) do
    case draw_card do
      card when card in cards ->
        draw_card(cards)
      card when length(cards) < 52 ->
        List.insert_at(cards, -1, card)
    end
  end
end