defmodule Gulib.Validations.Numericality do

  def validate(value, options \\ []) do
    Gulib.Validate.unless_skipping(value, options) do
      str = String.to_charlist("#{value}")

      valid_result = 
        case :string.to_integer(str) do
          {:error, :no_integer} -> :number_expected
          {_value, []} -> :ok
          {_value, _} ->
            case :string.to_float(str) do
              {:error, _} -> :rest_not_allowed
              {_value_f, []} -> :ok
              {_value_f, _} -> :rest_not_allowed
            end
        end

      case valid_result do
        :ok -> :ok
        _ -> {:fail, :not_number, Gulib.Translator.dgettext("validate", "Must be a number")}
      end
    end
  end

end