// Cyphesis Online RPG Server and AI Engine
// Copyright (C) 2011 Alistair Riddoch
//
// This program 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.
// 
// This program 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

// $Id$

#include <Python.h>

#include "PythonClass.h"

#include "rulesets/Python_Script_Utils.h"

#include "common/log.h"
#include "common/compose.hpp"

/// \brief ScriptKit constructor
/// 
/// @param package name of the script package scripts are to be created from
/// @param type name of the type instanced to create scripts
PythonClass::PythonClass(const std::string & package,
                         const std::string & type,
                         PyTypeObject * base) : m_package(package),
                                                m_type(type),
                                                m_base(base),
                                                m_module(0),
                                                m_class(0)
{
}

int PythonClass::load()
{
    m_module = Get_PyModule(m_package);
    if (m_module == NULL) {
        return -1;
    }
    return getClass();
}

PythonClass::~PythonClass()
{
    if (m_class != 0) {
        Py_DECREF(m_class);
    }
    if (m_module != 0) {
        Py_DECREF(m_module);
    }
}

/// \brief Retrieve the pythonclass object from the module which has
/// already been loaded.
int PythonClass::getClass()
{
    m_class = Get_PyClass(m_module, m_package, m_type);
    if (m_class == 0) {
        return -1;
    }
    if (!PyType_IsSubtype((PyTypeObject*)m_class, m_base)) {
        log(ERROR, String::compose("Python class \"%1.%2\" does not inherit "
                                   "from a core server type \"%3\".",
                                   m_package, m_type, m_base->tp_name));
        Py_DECREF(m_class);
        m_class = 0;
        return -1;
    }

    return 0;
}

int PythonClass::refresh()
{
    if (m_module == 0) {
        return -1;
    }
    PyObject * new_module = PyImport_ReloadModule(m_module);
    if (new_module == 0) {
        log(ERROR, String::compose("Error reloading python module \"%1\"",
                                   m_package));
        PyErr_Clear();
        return -1;
    }
    Py_DECREF(m_module);
    m_module = new_module;
    return getClass();
}