defmodule Beanstream.Gateway do
  @moduledoc """
  Configuration for Beanstream Gateway.
  """

  defstruct [
    merchant_id: nil,
    payments_passcode: nil, # API access passcode
    profiles_passcode: nil,
    reporting_passcode: nil, # reporting and transaction download
    # recurring billing passcode
    # batch file upload passcode
  ]

  @type t :: %Beanstream.Gateway{
    merchant_id: String.t,
    payments_passcode: String.t,
    profiles_passcode: String.t,
    reporting_passcode: String.t,
  }

  @spec auth_header(Beanstream.Gateway.t, String.t) :: Keyword.t
  def auth_header(gw, "payments") do
    make_auth_header(gw.merchant_id, gw.payments_passcode)
  end

  @spec auth_header(Beanstream.Gateway.t, String.t) :: Keyword.t
  def auth_header(gw, "profiles") do
    make_auth_header(gw.merchant_id, gw.profiles_passcode)
  end

  defp make_auth_header(merchant_id, passcode) do
    auth = Base.encode64("#{merchant_id}:#{passcode}")
    [{"Authorization", "Passcode #{auth}"}]
  end

end