defmodule OktaElixir.Randomizer do
  def randomizer(length, type \\ :all) do
    alphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    numbers = "0123456789"

    lists =
      cond do
        type == :alpha -> alphabets <> String.downcase(alphabets)
        type == :numeric -> numbers
        type == :upcase -> alphabets
        type == :downcase -> String.downcase(alphabets)
        true -> alphabets <> String.downcase(alphabets) <> numbers
      end
      |> String.split("", trim: true)

    do_randomizer(length, lists)
  end

  @doc false
  defp get_range(length) when length > 1, do: 1..length
  defp get_range(length), do: [1]

  @doc false
  defp do_randomizer(length, lists) do
    get_range(length)
    |> Enum.reduce([], fn _, acc -> [Enum.random(lists) | acc] end)
    |> Enum.join("")
  end
end