defmodule Eflatbuffers.Utils do

  def scalar?({ type, _options }), do: scalar?(type)
  def scalar?(:string), do: false
  def scalar?(:vector), do: false
  def scalar?(:table),  do: false
  def scalar?(:enum),   do: true
  def scalar?(_),       do: true

  def scalar_size({ type, _options }), do: scalar_size(type)
  def scalar_size(:byte ), do: 1
  def scalar_size(:ubyte), do: 1
  def scalar_size(:bool ), do: 1
  def scalar_size(:short ), do: 2
  def scalar_size(:ushort), do: 2
  def scalar_size(:int  ), do: 4
  def scalar_size(:uint ), do: 4
  def scalar_size(:float), do: 4
  def scalar_size(:long  ), do: 8
  def scalar_size(:ulong ), do: 8
  def scalar_size(:double), do: 8
  def scalar_size(type), do: throw({:error, {:unknown_scalar, type}})

  def extract_scalar_type({:enum, %{ name: enum_name }}, {tables, _options}) do
    { :enum, %{ type: type }} =  Map.get(tables, enum_name)
    type
  end

  def extract_scalar_type(type, _), do: type


end