defmodule SwitchTest do
  @moduledoc """
  Simple test to verify the ISO8583 switch implementation works.
  """
  
  def test_switch_start do
    IO.puts("Testing ISO8583 Switch startup...")
    
    case DaProductApp.Switch.start_listener(5001) do
      :ok -> 
        IO.puts("✅ Switch started successfully on port 5001")
        DaProductApp.Switch.stop_listener()
        IO.puts("✅ Switch stopped successfully")
        :ok
      {:error, reason} ->
        IO.puts("❌ Failed to start switch: #{inspect(reason)}")
        {:error, reason}
    end
  end
  
  def test_message_handler do
    IO.puts("Testing message handler...")
    
    # Test simple message encoding
    test_message = %{
      "0" => "0200",
      "2" => "4111111111111111",
      "3" => "000000",
      "11" => "000001"
    }
    
    case DaProductApp.Switch.ISO8583BMessageHandler.encode(test_message) do
      {:ok, encoded} ->
        IO.puts("✅ Message encoded successfully: #{byte_size(encoded)} bytes")
        :ok
      {:error, reason} ->
        IO.puts("❌ Failed to encode message: #{inspect(reason)}")
        {:error, reason}
    end
  end
  
  def test_router do
    IO.puts("Testing router...")
    
    # Test Visa card routing
    visa_message = %{
      "0" => "0200",
      "2" => "4111111111111111",  # Visa card
      "3" => "000000"
    }
    
    # Test router without actually sending to upstream
    connector = DaProductApp.Switch.Router.determine_connector(visa_message)
    IO.puts("✅ Router correctly selected: #{inspect(connector)}")
    
    :ok
  end
  
  def run_all_tests do
    IO.puts("=== ISO8583 Switch Implementation Verification ===\n")
    
    test_switch_start()
    test_message_handler()
    test_router()
    
    IO.puts("\n=== All Tests Completed ===")
  end
end