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** This file is part of Qt for Python.
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** General Public License version 3 as published by the Free Software
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** 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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****************************************************************************/

#include "helper.h"
#include "sbkstring.h"
#include "sbkstaticstrings.h"

#include <iomanip>
#include <iostream>

#include <cstdarg>

#ifdef _WIN32
#  ifndef NOMINMAX
#    define NOMINMAX
#  endif
#  include <windows.h>
#else
#  include <pthread.h>
#endif

#include <algorithm>

static void formatPyTypeObject(const PyTypeObject *obj, std::ostream &str)
{
    if (obj) {
        str << '"' << obj->tp_name << "\", 0x" << std::hex
            << obj->tp_flags << std::dec;
        if (obj->tp_flags & Py_TPFLAGS_HEAPTYPE)
            str << " [heaptype]";
        if (obj->tp_flags & Py_TPFLAGS_BASETYPE)
            str << " [base]";
        if (obj->tp_flags & Py_TPFLAGS_HAVE_GC)
            str << " [gc]";
        if (obj->tp_flags & Py_TPFLAGS_LONG_SUBCLASS)
            str << " [long]";
        if (obj->tp_flags & Py_TPFLAGS_LIST_SUBCLASS)
            str << " [list]";
        if (obj->tp_flags & Py_TPFLAGS_TUPLE_SUBCLASS)
            str << " [tuple]";
        if (obj->tp_flags & Py_TPFLAGS_BYTES_SUBCLASS)
            str << " [bytes]";
        if (obj->tp_flags & Py_TPFLAGS_UNICODE_SUBCLASS)
            str << " [unicode]";
        if (obj->tp_flags & Py_TPFLAGS_DICT_SUBCLASS)
            str << " [dict]";
        if (obj->tp_flags & Py_TPFLAGS_TYPE_SUBCLASS)
            str << " [type]";
        if (obj->tp_flags & Py_TPFLAGS_IS_ABSTRACT)
            str << " [abstract]";
    } else {
        str << '0';
    }
}

static void formatPyObject(PyObject *obj, std::ostream &str);

static void formatPySequence(PyObject *obj, std::ostream &str)
{
    const Py_ssize_t size = PySequence_Size(obj);
    const Py_ssize_t printSize = std::min(size, Py_ssize_t(5));
    str << size << " <";
    for (Py_ssize_t i = 0; i < printSize; ++i) {
        if (i)
            str << ", ";
        str << '(';
        PyObject *item = PySequence_GetItem(obj, i);
        formatPyObject(item, str);
        str << ')';
        Py_XDECREF(item);
    }
    if (printSize < size)
        str << ",...";
    str << '>';
}

static void formatPyObject(PyObject *obj, std::ostream &str)
{
    if (obj) {
        formatPyTypeObject(obj->ob_type, str);
        str << ", ";
        if (PyLong_Check(obj))
            str << PyLong_AsLong(obj);
        else if (PyFloat_Check(obj))
            str << PyFloat_AsDouble(obj);
        else if (PyUnicode_Check(obj))
            str << '"' << _PepUnicode_AsString(obj) << '"';
        else if (PySequence_Check(obj))
            formatPySequence(obj, str);
        else
            str << "<unknown>";
    } else {
        str << '0';
    }
}

namespace Shiboken
{

debugPyObject::debugPyObject(PyObject *o) : m_object(o)
{
}

debugPyTypeObject::debugPyTypeObject(const PyTypeObject *o) : m_object(o)
{
}

std::ostream &operator<<(std::ostream &str, const debugPyTypeObject &o)
{
    str << "PyTypeObject(";
    formatPyTypeObject(o.m_object, str);
    str << ')';
    return str;
}

std::ostream &operator<<(std::ostream &str, const debugPyObject &o)
{
    str << "PyObject(";
    formatPyObject(o.m_object, str);
    str << ')';
    return str;
}

#ifdef _WIN32
// Converts a Unicode string to a string encoded in the Windows console's
// code page via wchar_t for use with argv (PYSIDE-1425).
// FIXME: Remove once Windows console uses UTF-8
static char *toWindowsConsoleEncoding(PyObject *unicode)
{
    wchar_t *buf =  PyUnicode_AsWideCharString(unicode, nullptr);
    if (buf == nullptr)
        return nullptr;
    const int required = WideCharToMultiByte(CP_ACP, 0, buf, -1,
                                             nullptr, 0, nullptr, nullptr);
    if (required == 0) {
        PyMem_Free(buf);
        return nullptr;
    }
    char *result = new char[required];
    WideCharToMultiByte(CP_ACP, 0, buf, -1,
                        result, required, nullptr, nullptr);
    PyMem_Free(buf);
    return result;
}
#endif // _WIN32

// PySide-510: Changed from PySequence to PyList, which is correct.
bool listToArgcArgv(PyObject *argList, int *argc, char ***argv, const char *defaultAppName)
{
    if (!PyList_Check(argList))
        return false;

    if (!defaultAppName)
        defaultAppName = "PySideApplication";

    // Check all items
    Shiboken::AutoDecRef args(PySequence_Fast(argList, nullptr));
    int numArgs = int(PySequence_Fast_GET_SIZE(argList));
    for (int i = 0; i < numArgs; ++i) {
        PyObject *item = PyList_GET_ITEM(args.object(), i);
        if (!PyBytes_Check(item) && !PyUnicode_Check(item))
            return false;
    }

    bool hasEmptyArgList = numArgs == 0;
    if (hasEmptyArgList)
        numArgs = 1;

    *argc = numArgs;
    *argv = new char *[*argc];

    if (hasEmptyArgList) {
        // Try to get the script name
        PyObject *globals = PyEval_GetGlobals();
        PyObject *appName = PyDict_GetItem(globals, Shiboken::PyMagicName::file());
        (*argv)[0] = strdup(appName ? Shiboken::String::toCString(appName) : defaultAppName);
    } else {
        for (int i = 0; i < numArgs; ++i) {
            PyObject *item = PyList_GET_ITEM(args.object(), i);
            char *string = nullptr;
            if (Shiboken::String::check(item)) {
#ifdef _WIN32
                string = toWindowsConsoleEncoding(item);
#else
                string = strdup(Shiboken::String::toCString(item));
#endif
            }
            (*argv)[i] = string;
        }
    }

    return true;
}

int *sequenceToIntArray(PyObject *obj, bool zeroTerminated)
{
    AutoDecRef seq(PySequence_Fast(obj, "Sequence of ints expected"));
    if (seq.isNull())
        return nullptr;

    Py_ssize_t size = PySequence_Fast_GET_SIZE(seq.object());
    int *array = new int[size + (zeroTerminated ? 1 : 0)];

    for (int i = 0; i < size; i++) {
        PyObject *item = PySequence_Fast_GET_ITEM(seq.object(), i);
        if (!PyInt_Check(item)) {
            PyErr_SetString(PyExc_TypeError, "Sequence of ints expected");
            delete[] array;
            return nullptr;
        }
        array[i] = PyInt_AsLong(item);
    }

    if (zeroTerminated)
        array[size] = 0;

    return array;
}


int warning(PyObject *category, int stacklevel, const char *format, ...)
{
    va_list args;
    va_start(args, format);
#ifdef _WIN32
    va_list args2 = args;
#else
    va_list args2;
    va_copy(args2, args);
#endif

    // check the necessary memory
    int size = vsnprintf(nullptr, 0, format, args) + 1;
    auto message = new char[size];
    int result = 0;
    if (message) {
        // format the message
        vsnprintf(message, size, format, args2);
        result = PyErr_WarnEx(category, message, stacklevel);
        delete [] message;
    }
    va_end(args2);
    va_end(args);
    return result;
}

ThreadId currentThreadId()
{
#if defined(_WIN32)
    return GetCurrentThreadId();
#elif defined(__APPLE_CC__)
    return reinterpret_cast<ThreadId>(pthread_self());
#else
    return pthread_self();
#endif
}

// Internal, used by init() from main thread
static ThreadId _mainThreadId{0};
void _initMainThreadId() { _mainThreadId =  currentThreadId(); }

ThreadId mainThreadId()
{
    return _mainThreadId;
}

} // namespace Shiboken
