#!/usr/bin/env elixir

# Simple test to verify ISO8583 message encoding
Mix.install([])

defmodule ISOTest do
  def run do
    # Load the application modules
    Code.require_file("lib/da_product_app.ex")
    
    # Start the application
    Application.ensure_all_started(:da_product_app)
    
    # Create a test message
    alias DaProductApp.MercuryISO8583.Packagers.{ISOMsg, ISO87BPackager}
    alias DaProductApp.Switch.ISO8583BMessageHandler
    
    IO.puts("Creating test ISO8583 message...")
    
    # Create message with packager
    msg = ISOMsg.new("0410")
    msg = ISOMsg.set_packager(msg, ISO87BPackager)
    
    # Add some fields
    msg = ISOMsg.set(msg, 2, "4854980600736740")
    msg = ISOMsg.set(msg, 3, "8000")
    msg = ISOMsg.set(msg, 4, "600")
    msg = ISOMsg.set(msg, 39, "96")
    
    IO.puts("Message created with fields: #{inspect(ISOMsg.get_all_fields(msg))}")
    
    # Test encoding
    case ISO8583BMessageHandler.encode(msg) do
      {:ok, encoded_data} ->
        IO.puts("✅ Message encoded successfully!")
        IO.puts("Encoded length: #{byte_size(encoded_data)} bytes")
        IO.puts("Encoded hex: #{Base.encode16(encoded_data) |> String.slice(0, 100)}...")
        
      {:error, reason} ->
        IO.puts("❌ Encoding failed: #{inspect(reason)}")
    end
  end
end

ISOTest.run()