/*
 * Copyright (C) 2020 Weber Yann
 * 
 * This file is part of pyrpn.
 * 
 * pyrpn 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 3 of the License, or
 * any later version.
 * 
 * pyrpn 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 pyrpn.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef _PYTHON_PYRPN_H__
#define _PYTHON_PYRPN_H__

#include "config.h"

#include <errno.h>

#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "structmember.h"

#include "rpn_jit.h"

/**@defgroup python_type RPNExpr Python class
 * @brief Exposed Python class : RPNExpr
 * @ingroup python_module
 */

/**@file python_rpnexpr.h
 * @brief Python RPNExpr type headers
 * @ingroup python_type
 *
 * This file is the header of the RPNExpr Python class
 */

/**@brief RPNExpr Python class methods list
 * @ingroup python_type */
extern PyMethodDef RPNExpr_methods[];
/**@brief RPNExpr Python class members list
 * @ingroup python_type */
extern PyMemberDef RPNExpr_members[];
/**@brief RPNExpr Python class type definition
 * @ingroup python_type */
extern PyTypeObject RPNExprType;

/**@brief Structure holding RPNExpr objects
 * @ingroup python_type */
typedef struct
{
	PyObject_VAR_HEAD;
	
	/**@brief Pointer on @ref rpn_expr_s */
	rpn_expr_t *rpn;

	/**@brief Array storing expression argument
	 * @note As attribute of rpn_expr allowing malloc & free only once */
	rpn_value_t *args;
} PyRPNExpr_t;

/**@brief Organize PyRPNExpr_t state data
 * @see rpnexpr_getstate
 * @see rpnexpr_setstate */
typedef struct
{
	size_t total_sz;
	size_t argc;
	unsigned char stack_sz;
	size_t token_sz;
} PyRPNExpr_state_t;

/**@brief RpnExpr __new__ method
 * @param subtype Type of object being created (pyrpn.RPNExpr)
 * @param args positional arguments for subtype
 * @param kwargs keyword argumenrs for subtype
 * @return The new Python RPNExpr object
 */
PyObject* rpnexpr_new(PyTypeObject *subtype, PyObject *args, PyObject* kwds);

/**@brief RpnExpr constructor
 * @param self New RPNExpr instance
 * @param args Positional arguments list
 * @param kwds Keywords arguments dict
 * @return 0 if no error else -1
 * @ingroup python_type
 */
int rpnexpr_init(PyObject *self, PyObject *args, PyObject *kwds);

/**@brief RPNExpr __del__ method 
 * @param self RPNExpr instance
 * @ingroup python_type
 */
void rpnexpr_del(PyObject *self);

/**@brief RPNExpr __getstate__ method for pickling
 * @param cls RPNExpr type object
 * @param noargs Not an argument...
 * @return A bytes Python instance suitable as argument for
 * @ref rpnexpr_setstate
 */
PyObject* rpnexpr_getstate(PyObject *cls, PyObject *noargs);

/**@brief RPNExpr __setstate__ method for pickling
 * @param cls RPNExpr type object
 * @param state Should by a bytes Python instance returned by @ref
 * rpnexpr_getstate
 * @return A bytes Python instance suitable as argument for
 * @ref rpnexpr_setstate
 */
PyObject* rpnexpr_setstate(PyObject *cls, PyObject *state);

/**@brief Eval an RPN expression given arguments and return the
 * value
 * @param self RPNExpr instance
 * @param argv Array of PyObject* arguments
 * @param argc Number of arguments
 * @return The value resulting of evaluation
 * @ingroup python_type
 */
PyObject* rpnexpr_eval(PyObject* self, PyObject** argv, Py_ssize_t argc);

/**@brief Set all stack item to zero
 * @param self RPNExpr instance
 * @param noargs Dummy argument for METH_NOARG
 * @return None
 * @ingroup python_type
 */
PyObject* rpnexpr_reset_stack(PyObject *self, PyObject *noargs);

/**@brief RPNExpr.__repr__()
 * @param self RPNExpr instance
 * @ingroup python_type
 */
PyObject* rpnexpr_repr(PyObject *self);

/**@brief RPNExpr.__str__()
 * @param self RPNExpr instance
 * @ingroup python_type
 */
PyObject* rpnexpr_str(PyObject *self);

#endif