# defmodule Qrcode do
#
#   def generate(value, pad \\ nil) do
#     token =
#       case pad do
#         nil ->
#           pad_string(value, 20)
#         pad ->
#           String.upcase("#{pad}#{value}")
#       end
#     uid = Timex.now |> Timex.to_gregorian_microseconds
#     path = "/tmp/qr_#{uid}.png"
#     qrcode = :qrcode.encode(token)
#     image = :qrcode_demo.simple_png_encode(qrcode)
#     File.write(path, image)
#     %{path: path, token: token, filename: "qr_#{uid}.png", mime_type: "image/png"}
#   end
#
#   def pad_string(string, length) do
#     current_length = String.length(string)
#     pad_length = length - current_length
#     pad_string = String.slice(String.upcase(UUID.uuid4), 0, pad_length)
#     pad_string <> string
#   end
#
# end