defmodule DaProductApp.SwitchTest do
  use ExUnit.Case, async: true
  
  alias DaProductApp.Switch.MessageHandler
  alias DaProductApp.Switch.Router
  alias DaProductApp.Switch.Connectors.Fallback

  describe "MessageHandler" do
    test "creates response message" do
      request = %ISO8583.Message{
        message_type_indicator: "0200",
        data_elements: %{
          2 => "4111111111111111",
          3 => "000000",
          4 => "100000",
          7 => "1225120000",
          11 => "123456"
        }
      }
      
      response = MessageHandler.create_response(request, "00")
      
      assert response.message_type_indicator == "1200"
      assert Map.get(response.data_elements, 39) == "00"
      assert Map.get(response.data_elements, 2) == "4111111111111111"
    end
  end

  describe "Router" do
    test "routes Visa cards to Visa connector" do
      message = %ISO8583.Message{
        message_type_indicator: "0200",
        data_elements: %{
          2 => "4111111111111111",  # Visa card
          3 => "000000"
        }
      }
      
      # This will route to Visa but since we don't have real connections,
      # it will fall back to error handling
      response = Router.route(message)
      
      assert response.message_type_indicator == "1200"
      assert Map.has_key?(response.data_elements, 39)
    end
  end

  describe "Fallback Connector" do
    test "handles unknown card types" do
      message = %ISO8583.Message{
        message_type_indicator: "0200",
        data_elements: %{
          2 => "9999999999999999",  # Unknown card
          3 => "000000",
          7 => "1225120000",
          11 => "123456"
        }
      }
      
      response = Fallback.handle(message)
      
      assert response.message_type_indicator == "1200"
      assert Map.get(response.data_elements, 39) == "14"  # Invalid card
    end
  end
end