/****************************************************************************
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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****************************************************************************/

#include "ioutils.h"

#include <QtCore/QDir>
#include <QtCore/QFile>

#ifdef Q_OS_WIN
#  include <windows.h>
#else
#  include <sys/types.h>
#  include <sys/stat.h>
#  include <unistd.h>
#endif

using namespace ProFileEvaluatorInternal;

IoUtils::FileType IoUtils::fileType(const QString &fileName)
{
    Q_ASSERT(fileName.isEmpty() || isAbsolutePath(fileName));
#ifdef Q_OS_WIN
    DWORD attr = GetFileAttributesW((WCHAR*)fileName.utf16());
    if (attr == INVALID_FILE_ATTRIBUTES)
        return FileNotFound;
    return (attr & FILE_ATTRIBUTE_DIRECTORY) ? FileIsDir : FileIsRegular;
#else
    struct ::stat st;
    if (::stat(fileName.toLocal8Bit().constData(), &st))
        return FileNotFound;
    return S_ISDIR(st.st_mode) ? FileIsDir : FileIsRegular;
#endif
}

bool IoUtils::isRelativePath(const QString &path)
{
    if (path.startsWith(QLatin1Char('/')))
        return false;
#ifdef Q_OS_WIN
    if (path.startsWith(QLatin1Char('\\')))
        return false;
    // Unlike QFileInfo, this won't accept a relative path with a drive letter.
    // Such paths result in a royal mess anyway ...
    if (path.length() >= 3 && path.at(1) == QLatin1Char(':') && path.at(0).isLetter()
        && (path.at(2) == QLatin1Char('/') || path.at(2) == QLatin1Char('\\')))
        return false;
#endif
    return true;
}

QStringRef IoUtils::fileName(const QString &fileName)
{
    return fileName.midRef(fileName.lastIndexOf(QLatin1Char('/')) + 1);
}

QString IoUtils::resolvePath(const QString &baseDir, const QString &fileName)
{
    if (fileName.isEmpty())
        return QString();
    if (isAbsolutePath(fileName))
        return QDir::cleanPath(fileName);
    return QDir::cleanPath(baseDir + QLatin1Char('/') + fileName);
}

#ifdef QT_BOOTSTRAPPED
inline static bool isSpecialChar(ushort c)
{
    // Chars that should be quoted (TM). This includes:
#ifdef Q_OS_WIN
    // - control chars & space
    // - the shell meta chars "&()<>^|
    // - the potential separators ,;=
    static const uchar iqm[] = {
        0xff, 0xff, 0xff, 0xff, 0x45, 0x13, 0x00, 0x78,
        0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x10
    };
#else
    static const uchar iqm[] = {
        0xff, 0xff, 0xff, 0xff, 0xdf, 0x07, 0x00, 0xd8,
        0x00, 0x00, 0x00, 0x38, 0x01, 0x00, 0x00, 0x78
    }; // 0-32 \'"$`<>|;&(){}*?#!~[]
#endif

    return (c < sizeof(iqm) * 8) && (iqm[c / 8] & (1 << (c & 7)));
}

inline static bool hasSpecialChars(const QString &arg)
{
    for (int x = arg.length() - 1; x >= 0; --x)
        if (isSpecialChar(arg.unicode()[x].unicode()))
            return true;
    return false;
}

QString IoUtils::shellQuote(const QString &arg)
{
    if (!arg.length())
        return QString::fromLatin1("\"\"");

    QString ret(arg);
    if (hasSpecialChars(ret)) {
#ifdef Q_OS_WIN
        // Quotes are escaped and their preceding backslashes are doubled.
        // It's impossible to escape anything inside a quoted string on cmd
        // level, so the outer quoting must be "suspended".
        ret.replace(QRegExp(QLatin1String("(\\\\*)\"")), QLatin1String("\"\\1\\1\\^\"\""));
        // The argument must not end with a \ since this would be interpreted
        // as escaping the quote -- rather put the \ behind the quote: e.g.
        // rather use "foo"\ than "foo\"
        int i = ret.length();
        while (i > 0 && ret.at(i - 1) == QLatin1Char('\\'))
            --i;
        ret.insert(i, QLatin1Char('"'));
        ret.prepend(QLatin1Char('"'));
#else // Q_OS_WIN
        ret.replace(QLatin1Char('\''), QLatin1String("'\\''"));
        ret.prepend(QLatin1Char('\''));
        ret.append(QLatin1Char('\''));
#endif // Q_OS_WIN
    }
    return ret;
}
#endif
