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#ifndef QBS_FILETIME_H
#define QBS_FILETIME_H

#include "persistence.h"

#include <QtCore/qdatastream.h>
#include <QtCore/qdebug.h>

#if defined(Q_OS_UNIX)
#include <time.h>
#endif // Q_OS_UNIX

namespace qbs {
namespace Internal {

#if defined(Q_OS_WIN)
template<typename T>
T toFileTime(quint64 fileTime)
{
    T result;
    result.dwLowDateTime = fileTime;
    result.dwHighDateTime = fileTime >> 32;
    return result;
}
template<typename T>
quint64 fromFileTime(T fileTime)
{
    return static_cast<quint64>(fileTime.dwLowDateTime)
           | (static_cast<quint64>(fileTime.dwHighDateTime) << 32);
}
#endif

class QBS_AUTOTEST_EXPORT FileTime
{
public:
#if defined(Q_OS_UNIX)
    using InternalType = timespec;
#elif defined(Q_OS_WIN)
    using InternalType = quint64;
#else
#   error unknown platform
#endif

    FileTime();
    FileTime(const InternalType &ft);

    bool operator<(const FileTime &rhs) const { return compare(rhs) < 0; }
    bool operator>(const FileTime &rhs) const { return compare(rhs) > 0; }
    bool operator<=(const FileTime &rhs) const { return !operator>(rhs); }
    bool operator>=(const FileTime &rhs) const { return !operator<(rhs); }
    bool operator==(const FileTime &rhs) const { return compare(rhs) == 0; }
    bool operator!= (const FileTime &rhs) const { return !operator==(rhs); }
    int compare(const FileTime &other) const;

    void clear();
    bool isValid() const;
    QString toString() const;

    static FileTime currentTime();
    static FileTime oldestTime();

    double asDouble() const;

    template<PersistentPool::OpType opType> void completeSerializationOp(PersistentPool &pool)
    {
#if !defined(Q_OS_WIN)
        pool.serializationOp<opType>(m_fileTime.tv_sec, m_fileTime.tv_nsec);
#else
        pool.serializationOp<opType>(m_fileTime);
#endif
    }

private:
    InternalType m_fileTime{};
};

} // namespace Internal
} // namespace qbs

QT_BEGIN_NAMESPACE

inline QDebug operator<<(QDebug dbg, const qbs::Internal::FileTime &t)
{
    dbg.nospace() << t.toString();
    return dbg.space();
}

QT_END_NAMESPACE

#endif // QBS_FILETIME_H
