defmodule Faker.Random do
  @moduledoc """
  Behaviour that defines randomisation in faker.
  """

  @callback random_between(integer(), integer()) :: integer()
  @callback random_bytes(pos_integer()) :: binary()
  @callback random_uniform() :: float()
  @callback shuffle(Enum.t()) :: list()

  defmacro __using__(_) do
    quote do
      @behaviour Faker.Random

      def random_between(left, right) do
        Enum.random(left..right)
      end

      def random_bytes(total) do
        :crypto.strong_rand_bytes(total)
      end

      def random_uniform do
        :rand.uniform()
      end

      def shuffle(enum) do
        Enum.shuffle(enum)
      end

      defoverridable random_between: 2, random_bytes: 1, random_uniform: 0, shuffle: 1
    end
  end
end