defmodule SigmaKit.Util do
  @doc """
  Get a random string of given length.
  Returns a random url safe encoded64 string of the given length.
  Used to generate tokens for the various modules that require unique tokens.
  """
  def random_string(length \\ 10) do
    length
    |> :crypto.strong_rand_bytes()
    |> Base.url_encode64()
    |> binary_part(0, length)
  end

  @doc """
  Get a random numeric string of given length.
  """
  def random_numeric_string(length \\ 10) do
    length
    |> :crypto.strong_rand_bytes()
    |> :crypto.bytes_to_integer()
    |> Integer.to_string()
    |> binary_part(0, length)
  end

  @doc "Trim whitespace on either end of a string. Account for nil"
  def trim(str) when is_nil(str), do: str
  def trim(str) when is_binary(str), do: String.trim(str)
  def blank?(term), do: Blankable.blank?(term)
  @doc "Opposite of blank?"
  def present?(term), do: !Blankable.blank?(term)
  def pluralize(word, count), do: Inflex.inflect(word, count)
  def format_money(cents, currency \\ "USD"), do: CurrencyFormatter.format(cents, currency)

  @doc "Useful for when you have an array of strings coming in from a user form"
  def trim_strings_in_array(array) do
    array
    |> Enum.map(&String.trim/1)
    |> Enum.filter(&present?/1)
  end

  @doc """
  ## Examples:

      iex> number_with_delimiter(1000)
      "1,000"
      iex> number_with_delimiter(1000000)
      "1,000,000"
  """
  def number_with_delimiter(i) when is_binary(i), do: number_with_delimiter(String.to_integer(i))

  def number_with_delimiter(i) when is_integer(i) do
    i
    |> Integer.to_charlist()
    |> Enum.reverse()
    |> Enum.chunk_every(3, 3, [])
    |> Enum.join(",")
    |> String.reverse()
  end
end