defmodule NDCEx.Message.Base do
  import XmlBuilderPlus
  #require Logger
  #use Timex

  @acceptable_ndc_methods [
                            AirShopping: ["AirShoppingRQ", "AirShoppingRS"],
                            FlightPrice: ["FlightPriceRQ", "FlightPriceRS"],
                            SeatAvailability: ["SeatAvailabilityRQ", "SeatAvailabilityRS"],
                            ServiceList: ["ServiceListRQ", "ServiceListRS"],
                            ServicePrice: ["ServicePriceRQ", "ServicePriceRS"],

                            OrderCreate: ["OrderCreateRQ", "OrderViewRS"],
                            OrderList: ["OrderListRQ", "OrderListRS"],
                            OrderRetrieve: ["OrderRetrieveRQ", "OrderViewRS"],
                            OrderCancel: ["OrderCancelRQ", "OrderCancelRS"],

                            ItinReshop: ["ItinReshopRQ", "ItinReshopRS"],
                            BaggageCharges: ["BaggageChargesRQ", "BaggageChargesRS"],
                            OrderChange: ["OrderChangeRQ", "OrderChangeRS"],
                            OrderCancel: ["OrderCancelRQ", "OrderCancelRS"],

                            OrderRetrieve: ["OrderRetrieveRQ", "OrderRetrieveRS"]
                          ]
  @node_names [
                AirShoppingRQ: ["Parameters", "Travelers", "CoreQuery", "Preferences", "Metadata"],
                FlightPriceRQ: ["Travelers", "Query", "Metadata", "DataLists"],
                SeatAvailabilityRQ: ["Travelers", "Query", "DataList", "Metadata"],
                OrderCreateRQ: ["Query"],
                ItinReshopRQ: ["Query"],
                BaggageChargesRQ: ["Travelers", "Query"],
                OrderChangeRQ: ["Travelers", "Query"],
                OrderCancelRQ: ["Query"],
                OrderRetrieveRQ: ["Query"]
              ]

  def build_document(method, data, config) do
    xml =  build_ndc_body(method, data, config)
      |> ExtraData.set_wrapper(config["message"])
      |> SoapHelper.add_soap(config["soap"], method, [wrapper: config["message"]["wrapper"]])
      |> doc(config["soap"]["namespace_list"][method])
    {:ok, xml}
  end

  def build_document(method, data, config, credentials) do
    data = NDCMerge.getData(data, credentials[config["label"]]["Body"])
    xml =  build_ndc_body(method, data, config)
      |> ExtraData.set_wrapper(config["message"])
      |> SoapHelper.add_soap(config["soap"], method, [{"wrapper", config["message"]["wrapper"]}])
      |> doc(config["soap"]["namespace_list"][method])
    {:ok, xml}
  end

  defp generate_xml(data, nil), do: data |> doc
  defp generate_xml(data, ns), do: doc_with_namespace(data, ns)
  def build_url(url, method), do: String.replace(url, "{{NDC-method}}", method)
  defp get_request_data(method), do: @acceptable_ndc_methods[method]

  defp build_ndc_body(method, data, config) do
    [ndc_method, response_name] = get_request_data(method)
    ndc = String.to_atom(ndc_method)

    tag_list = ["Document", "Party" ] ++ @node_names[ndc]
    elements = [
      Enum.filter(tag_list, fn(tag) -> data[tag] != nil end)
      |> Enum.map( fn(tag) ->
            element(tag, data[tag])
        end)
    ]

    merge_attributes(config["ndc"]["attributes"][method], ndc, elements)
  end

  defp merge_attributes(nil, method, elements), do: element(method, elements)
  defp merge_attributes(attrs, method, elements), do: element(method, attrs, elements)

end