/*
 * Copyright (C) 2009 Sippy Software, Inc., http://www.sippysoft.com
 *
 * This file is part of opensips, a free SIP server.
 *
 * opensips is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * opensips is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
*/

#include <Python.h>

#include "../../mem/mem.h"
#include "../../data_lump.h"
#include "../../parser/parse_param.h"
#include "../../parser/msg_parser.h"
#include "../../dprint.h"
#include "../../action.h"
#include "../../config.h"
#include "../../parser/parse_uri.h"
#include "../../ut.h"

#include "python_exec.h"
#include "python_mod.h"
#include "python_msgobj.h"
#include "python_support.h"
#include "python_compat.h"

int
python_exec(struct sip_msg *_msg, str *_method_name_s, str *_mystr_s)
{
 PyObject *pFunc, *pArgs, *pValue, *pResult;
 PyObject *msg;
 int rval;
 str method_name;
 str mystr;

 if (pkg_nt_str_dup(&method_name, _method_name_s) < 0)
 return -1;
 if (_mystr_s && pkg_nt_str_dup(&mystr, _mystr_s) < 0)
 return -1;

 PyEval_AcquireThread(myThreadState);

 pFunc = PyObject_GetAttrString(handler_obj, method_name.s);
 if (pFunc == NULL || !PyCallable_Check(pFunc)) {
 LM_ERR("%s not found or is not callable\n", method_name.s);
 Py_XDECREF(pFunc);
 PyEval_ReleaseThread(myThreadState);
 goto error;
 }

 msg = newmsgobject(_msg);
 if (msg == NULL) {
 LM_ERR("can't create MSGtype instance\n");
 Py_DECREF(pFunc);
 PyEval_ReleaseThread(myThreadState);
 goto error;
 }

 pArgs = PyTuple_New(!_mystr_s ? 1 : 2);
 if (pArgs == NULL) {
 LM_ERR("PyTuple_New() has failed\n");
 msg_invalidate(msg);
 Py_DECREF(msg);
 Py_DECREF(pFunc);
 PyEval_ReleaseThread(myThreadState);
 goto error;
 }
 PyTuple_SetItem(pArgs, 0, msg);
 /* Tuple steals msg */

 if (_mystr_s != NULL) {
 pValue = PyUnicode_FromString(mystr.s);
 if (pValue == NULL) {
 LM_ERR("PyUnicode_FromString(%s) has failed\n", mystr.s);
 msg_invalidate(msg);
 Py_DECREF(pArgs);
 Py_DECREF(pFunc);
 PyEval_ReleaseThread(myThreadState);
 goto error;
 }
 PyTuple_SetItem(pArgs, 1, pValue);
 /* Tuple steals pValue */
 }

 pResult = PyObject_CallObject(pFunc, pArgs);
 msg_invalidate(msg);
 Py_DECREF(pArgs);
 Py_DECREF(pFunc);
 if (PyErr_Occurred()) {
 Py_XDECREF(pResult);
 python_handle_exception("python_exec", method_name.s);
 PyEval_ReleaseThread(myThreadState);
 goto error;
 }

 if (pResult == NULL) {
 LM_ERR("PyObject_CallObject() returned NULL\n");
 PyEval_ReleaseThread(myThreadState);
 goto error;
 }

 rval = PyLong_AsLong(pResult);
 Py_DECREF(pResult);
 PyEval_ReleaseThread(myThreadState);
 
 pkg_free(method_name.s);

 return rval;

error:
 pkg_free(method_name.s);
 if (_mystr_s)
 pkg_free(mystr.s);

 return -1;
}