ecmendenhall/wgif

module WGif
  class InfoDisplayer

    GIGA_SIZE = 1_073_741_824.0
    MEGA_SIZE = 1_048_576.0
    KILO_SIZE = 1024.0

    def display(file_name)
      file_size = readable_file_size(File.size("#{file_name}").to_f)
      puts "#{file_name} is #{file_size}"
    end

    def readable_file_size(size)

      if size < KILO_SIZE
        abb, div = 'Bytes', 1
      elsif size < MEGA_SIZE
        abb, div = 'KB', KILO_SIZE
      elsif size < GIGA_SIZE
        abb, div = 'MB', MEGA_SIZE
      else
        abb, div = 'GB', GIGA_SIZE
      end

      format "%.3f #{abb}",  (size / div)
    end
  end
end