alias DaProductApp.MercuryISO8583.Packagers.{ISO87BPackager, ISOMsg, ISOComponent}

IO.puts("Creating message...")
msg = ISOMsg.new("0200", ISO87BPackager)
IO.puts("Message created: #{inspect(msg)}")

IO.puts("\nSetting field 4...")
msg = ISOMsg.set(msg, 4, 123456)
IO.puts("Message after setting field 4: #{inspect(msg)}")

IO.puts("\nGetting field 4...")
field = ISOMsg.get_field(msg, 4)
IO.puts("Field component: #{inspect(field)}")

if field do
  IO.puts("Field packager: #{inspect(field.packager)}")
  IO.puts("Field value: #{inspect(field.value)}")
  IO.puts("Field number: #{inspect(field.field_number)}")
else
  IO.puts("No field found")
end