/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QDebug>
#include <QDirIterator>
#include <QString>
#include <qplatformdefs.h>

#ifdef Q_OS_WIN
#   include <qt_windows.h>
#else
#   include <sys/stat.h>
#   include <sys/types.h>
#   include <dirent.h>
#   include <errno.h>
#   include <string.h>
#endif

#include <qtest.h>

#include "qfilesystemiterator.h"

class tst_qdiriterator : public QObject
{
    Q_OBJECT
private slots:
    void posix();
    void posix_data() { data(); }
    void diriterator();
    void diriterator_data() { data(); }
    void fsiterator();
    void fsiterator_data() { data(); }
    void data();
};


void tst_qdiriterator::data()
{
#if defined(Q_OS_WIN)
    const char *qtdir = "C:\\depot\\qt\\main";
#else
    const char *qtdir = ::getenv("QTDIR");
#endif
    if (!qtdir) {
        fprintf(stderr, "QTDIR not set\n");
        exit(1);
    }

    QTest::addColumn<QByteArray>("dirpath");
    QByteArray ba = QByteArray(qtdir) + "/src/corelib";
    QByteArray ba1 = ba + "/io";
    QTest::newRow(ba) << ba;
    //QTest::newRow(ba1) << ba1;
}

#ifdef Q_OS_WIN
static int posix_helper(const wchar_t *dirpath, size_t length)
{
    int count = 0;
    HANDLE hSearch;
    WIN32_FIND_DATA fd;

    wchar_t appendedPath[MAX_PATH];
    Q_ASSERT(MAX_PATH > length + 3);
    wcsncpy(appendedPath, dirpath, length);
    wcscpy(appendedPath + length, L"\\*");
#ifndef Q_OS_WINRT
    hSearch = FindFirstFile(appendedPath, &fd);
#else
    hSearch = FindFirstFileEx(appendedPath, FindExInfoStandard, &fd,
                              FindExSearchNameMatch, NULL, FIND_FIRST_EX_LARGE_FETCH);
#endif

    if (hSearch == INVALID_HANDLE_VALUE) {
        qWarning("FindFirstFile failed");
        return count;
    }

    do {
        if (!(fd.cFileName[0] == L'.' && fd.cFileName[1] == 0) &&
            !(fd.cFileName[0] == L'.' && fd.cFileName[1] == L'.' && fd.cFileName[2] == 0))
        {
            if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
                // newLength will "point" to where we put a * earlier, so we overwrite that.
                size_t newLength = length + 1; // "+ 1" for directory separator
                Q_ASSERT(newLength + wcslen(fd.cFileName) + 1 < MAX_PATH); // "+ 1" for null-terminator
                wcscpy(appendedPath + newLength, fd.cFileName);
                newLength += wcslen(fd.cFileName);
                count += posix_helper(appendedPath, newLength);
            }
            else {
                ++count;
            }
        }
    } while (FindNextFile(hSearch, &fd));
    FindClose(hSearch);

    return count;
}

#else

static int posix_helper(const char *dirpath)
{
    //qDebug() << "DIR" << dirpath;
    DIR *dir = ::opendir(dirpath);
    if (!dir)
        return 0;

    dirent *entry = 0;

    int count = 0;
    while ((entry = ::readdir(dir))) {
        if (qstrcmp(entry->d_name, ".") == 0)
            continue;
        if (qstrcmp(entry->d_name, "..") == 0)
            continue;
        ++count;
        QByteArray ba = dirpath;
        ba += '/';
        ba += entry->d_name;
        QT_STATBUF st;
        QT_LSTAT(ba.constData(), &st);
        if (S_ISDIR(st.st_mode))
            count += posix_helper(ba.constData());
    }

    ::closedir(dir);
    return count;
}
#endif


void tst_qdiriterator::posix()
{
    QFETCH(QByteArray, dirpath);

    int count = 0;
    QString path(dirpath);
    QBENCHMARK {
#ifdef Q_OS_WIN
        wchar_t wPath[MAX_PATH];
        const int end = path.toWCharArray(wPath);
        count = posix_helper(wPath, end);
#else
        count = posix_helper(dirpath.constData());
#endif
    }
    qDebug() << count;
}

void tst_qdiriterator::diriterator()
{
    QFETCH(QByteArray, dirpath);

    int count = 0;

    QBENCHMARK {
        int c = 0;

        QDirIterator dir(dirpath,
            //QDir::AllEntries | QDir::Hidden | QDir::NoDotAndDotDot,
            //QDir::AllEntries | QDir::Hidden,
            QDir::Files,
            QDirIterator::Subdirectories);

        while (dir.hasNext()) {
            dir.next();
            //printf("%s\n", qPrintable(dir.fileName()));
            0 && printf("%d %s\n",
                dir.fileInfo().isDir(),
                //qPrintable(dir.fileInfo().absoluteFilePath()),
                //qPrintable(dir.path()),
                qPrintable(dir.filePath()));
            ++c;
        }
        count = c;
    }
    qDebug() << count;
}

void tst_qdiriterator::fsiterator()
{
    QFETCH(QByteArray, dirpath);

    int count = 0;
    int dump = 0;

    QBENCHMARK {
        int c = 0;

        dump && printf("\n\n\n\n");
        QDirIteratorTest::QFileSystemIterator dir(dirpath,
            //QDir::AllEntries | QDir::Hidden | QDir::NoDotAndDotDot,
            //QDir::AllEntries | QDir::Hidden,
            //QDir::Files | QDir::NoDotAndDotDot,
            QDir::Files,
            QDirIteratorTest::QFileSystemIterator::Subdirectories);

        for (; !dir.atEnd(); dir.next()) {
            dump && printf("%d %s\n",
                dir.fileInfo().isDir(),
                //qPrintable(dir.fileInfo().absoluteFilePath()),
                //qPrintable(dir.path()),
                qPrintable(dir.filePath())
            );
            ++c;
        }
        count = c;
    }
    qDebug() << count;
}

QTEST_MAIN(tst_qdiriterator)

#include "main.moc"
