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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of Qt for Python.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
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** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#include <sbkpython.h>

#include "pysideclassinfo.h"
#include "pyside_p.h"
#include "pysideclassinfo_p.h"
#include "dynamicqmetaobject.h"

#include <shiboken.h>
#include <signature.h>

extern "C"
{

static PyObject *classInfoTpNew(PyTypeObject *subtype, PyObject *args, PyObject *kwds);
static int classInfoTpInit(PyObject *, PyObject *, PyObject *);
static void classInfoFree(void *);
static PyObject *classCall(PyObject *, PyObject *, PyObject *);

static PyType_Slot PySideClassInfoType_slots[] = {
    {Py_tp_call, (void *)classCall},
    {Py_tp_init, (void *)classInfoTpInit},
    {Py_tp_new, (void *)classInfoTpNew},
    {Py_tp_free, (void *)classInfoFree},
    {Py_tp_dealloc, (void *)object_dealloc},
    {0, 0}
};
static PyType_Spec PySideClassInfoType_spec = {
    "PySide2.QtCore.ClassInfo",
    sizeof(PySideClassInfo),
    0,
    Py_TPFLAGS_DEFAULT,
    PySideClassInfoType_slots,
};


PyTypeObject *PySideClassInfoTypeF(void)
{
    static PyTypeObject *type =
        reinterpret_cast<PyTypeObject *>(PyType_FromSpec(&PySideClassInfoType_spec));
    return type;
}

PyObject *classCall(PyObject *self, PyObject *args, PyObject * /* kw */)
{
    if (!PyTuple_Check(args) || PyTuple_Size(args) != 1) {
        PyErr_Format(PyExc_TypeError,
                     "The ClassInfo decorator takes exactly 1 positional argument (%zd given)",
                     PyTuple_Size(args));
        return 0;
    }

    PySideClassInfo *data = reinterpret_cast<PySideClassInfo *>(self);
    PySideClassInfoPrivate *pData = data->d;

    if (pData->m_alreadyWrapped) {
        PyErr_SetString(PyExc_TypeError, "This instance of ClassInfo() was already used to wrap an object");
        return 0;
    }

    PyObject *klass = PyTuple_GetItem(args, 0);
    bool validClass = false;

    // This will sometimes segfault if you mistakenly use it on a function declaration
    if (!PyType_Check(klass)) {
        PyErr_SetString(PyExc_TypeError, "This decorator can only be used on class declarations");
        return 0;
    }

    PyTypeObject *klassType = reinterpret_cast<PyTypeObject *>(klass);
    if (Shiboken::ObjectType::checkType(klassType)) {
        if (auto userData = PySide::retrieveTypeUserData(klassType)) {
            PySide::MetaObjectBuilder &mo = userData->mo;
            mo.addInfo(PySide::ClassInfo::getMap(data));
            pData->m_alreadyWrapped = true;
            validClass = true;
        }
    }

    if (!validClass) {
        PyErr_SetString(PyExc_TypeError, "This decorator can only be used on classes that are subclasses of QObject");
        return 0;
    }

    Py_INCREF(klass);
    return klass;
}

static PyObject *classInfoTpNew(PyTypeObject *subtype, PyObject * /* args */, PyObject * /* kwds */)
{
    PySideClassInfo *me = reinterpret_cast<PySideClassInfo *>(subtype->tp_alloc(subtype, 0));
    me->d = new PySideClassInfoPrivate;

    me->d->m_alreadyWrapped = false;

    return reinterpret_cast<PyObject *>(me);
}

int classInfoTpInit(PyObject *self, PyObject *args, PyObject *kwds)
{
    if (PyTuple_Check(args) && PyTuple_Size(args) > 0) {
        PyErr_Format(PyExc_TypeError, "ClassInfo() takes exactly 0 positional arguments (%zd given)", PyTuple_Size(args));
        return -1;
    }

    PySideClassInfo *data = reinterpret_cast<PySideClassInfo *>(self);
    PySideClassInfoPrivate *pData = data->d;

    PyObject *key;
    PyObject *value;
    Py_ssize_t pos = 0;

    // PyDict_Next causes a segfault if kwds is empty
    if (kwds && PyDict_Check(kwds) && PyDict_Size(kwds) > 0) {
        while (PyDict_Next(kwds, &pos, &key, &value)) {
            if (Shiboken::String::check(key) && Shiboken::String::check(value)) {
                pData->m_data[Shiboken::String::toCString(key)] = Shiboken::String::toCString(value);
            } else {
                PyErr_SetString(PyExc_TypeError, "All keys and values provided to ClassInfo() must be strings");
                return -1;
            }
        }
    }

    return PyErr_Occurred() ? -1 : 0;
}

void classInfoFree(void *self)
{
    auto pySelf = reinterpret_cast<PyObject *>(self);
    auto data = reinterpret_cast<PySideClassInfo *>(self);

    delete data->d;
    Py_TYPE(pySelf)->tp_base->tp_free(self);
}


} // extern "C"


namespace PySide { namespace ClassInfo {

static const char *ClassInfo_SignatureStrings[] = {
    "PySide2.QtCore.ClassInfo(**info:typing.Dict[str,str])",
    nullptr}; // Sentinel

void init(PyObject *module)
{
    if (SbkSpecial_Type_Ready(module, PySideClassInfoTypeF(), ClassInfo_SignatureStrings) < 0)
        return;

    Py_INCREF(PySideClassInfoTypeF());
    PyModule_AddObject(module, "ClassInfo", reinterpret_cast<PyObject *>(PySideClassInfoTypeF()));
}

bool checkType(PyObject *pyObj)
{
    if (pyObj)
        return PyType_IsSubtype(Py_TYPE(pyObj), PySideClassInfoTypeF());
    return false;
}

QMap<QByteArray, QByteArray> getMap(PySideClassInfo *obj)
{
    return obj->d->m_data;
}

} //namespace Property
} //namespace PySide
