using namespace boost::python;
using namespace ledger;

value_t py_calc_1(xpath_t::op_t& xpath_t, const details_t& item)
{
  value_t result;
  xpath_t.calc(result, item);
  return result;
}

template <typename T>
value_t py_calc(xpath_t::op_t& xpath_t, const T& item)
{
  value_t result;
  xpath_t.calc(result, details_t(item));
  return result;
}

xpath_t::op_t * py_parse_xpath_t_1(const string& str)
{
  return parse_xpath_t(str);
}

#define EXC_TRANSLATOR(type)				\
  void exc_translate_ ## type(const type& err) {	\
    PyErr_SetString(PyExc_RuntimeError, err.what());	\
  }

EXC_TRANSLATOR(xpath_t_error)
EXC_TRANSLATOR(calc_error)
#if 0
EXC_TRANSLATOR(mask_error)
#endif

void export_xpath()
{
  class_< details_t > ("Details", init<const entry_t&>())
    .def(init<const transaction_t&>())
    .def(init<const account_t&>())
    .add_property("entry",
		  make_getter(&details_t::entry,
			      return_value_policy<reference_existing_object>()))
    .add_property("xact",
		  make_getter(&details_t::xact,
			      return_value_policy<reference_existing_object>()))
    .add_property("account",
		  make_getter(&details_t::account,
			      return_value_policy<reference_existing_object>()))
    ;

  class_< xpath_t::op_t > ("ValueExpr", init<xpath_t::op_t::kind_t>())
    .def("calc", py_calc_1)
    .def("calc", py_calc<account_t>)
    .def("calc", py_calc<entry_t>)
    .def("calc", py_calc<transaction_t>)
    ;

  def("parse_xpath_t", py_parse_xpath_t_1,
      return_value_policy<manage_new_object>());

  class_< item_predicate<transaction_t> >
    ("TransactionPredicate", init<string>())
    .def("__call__", &item_predicate<transaction_t>::operator())
    ;

  class_< item_predicate<account_t> >
    ("AccountPredicate", init<string>())
    .def("__call__", &item_predicate<account_t>::operator())
    ;

#define EXC_TRANSLATE(type)					\
  register_exception_translator<type>(&exc_translate_ ## type);

  EXC_TRANSLATE(xpath_t_error);
  EXC_TRANSLATE(calc_error);
#if 0
  EXC_TRANSLATE(mask_error);
#endif
}