/****************************************************************************
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#ifndef QDATETIME_H
#define QDATETIME_H

#include <QtCore/qstring.h>
#include <QtCore/qnamespace.h>
#include <QtCore/qsharedpointer.h>

#include <limits>

QT_BEGIN_NAMESPACE


class Q_CORE_EXPORT QDate
{
public:
    enum MonthNameType {
        DateFormat = 0,
        StandaloneFormat
    };
public:
    QDate() { jd = nullJd(); }
    QDate(int y, int m, int d);

    bool isNull() const { return !isValid(); }
    bool isValid() const { return jd >= minJd() && jd <= maxJd(); }

    int year() const;
    int month() const;
    int day() const;
    int dayOfWeek() const;
    int dayOfYear() const;
    int daysInMonth() const;
    int daysInYear() const;
    int weekNumber(int *yearNum = 0) const;

#ifndef QT_NO_TEXTDATE
    static QString shortMonthName(int month, MonthNameType type = DateFormat);
    static QString shortDayName(int weekday, MonthNameType type = DateFormat);
    static QString longMonthName(int month, MonthNameType type = DateFormat);
    static QString longDayName(int weekday, MonthNameType type = DateFormat);
#endif // QT_NO_TEXTDATE
#ifndef QT_NO_DATESTRING
    QString toString(Qt::DateFormat f = Qt::TextDate) const;
    QString toString(const QString &format) const;
#endif
#if QT_DEPRECATED_SINCE(5,0)
QT_DEPRECATED inline bool setYMD(int y, int m, int d)
{ if (uint(y) <= 99) y += 1900; return setDate(y, m, d); }
#endif

    bool setDate(int year, int month, int day);

    void getDate(int *year, int *month, int *day);

    QDate addDays(qint64 days) const;
    QDate addMonths(int months) const;
    QDate addYears(int years) const;
    qint64 daysTo(const QDate &) const;

    bool operator==(const QDate &other) const { return jd == other.jd; }
    bool operator!=(const QDate &other) const { return jd != other.jd; }
    bool operator<(const QDate &other) const { return jd < other.jd; }
    bool operator<=(const QDate &other) const { return jd <= other.jd; }
    bool operator>(const QDate &other) const { return jd > other.jd; }
    bool operator>=(const QDate &other) const { return jd >= other.jd; }

    static QDate currentDate();
#ifndef QT_NO_DATESTRING
    static QDate fromString(const QString &s, Qt::DateFormat f = Qt::TextDate);
    static QDate fromString(const QString &s, const QString &format);
#endif
    static bool isValid(int y, int m, int d);
    static bool isLeapYear(int year);

    static inline QDate fromJulianDay(qint64 jd)
    { QDate d; if (jd >= minJd() && jd <= maxJd()) d.jd = jd; return d; }
    inline qint64 toJulianDay() const { return jd; }

private:
    static inline qint64 nullJd() { return std::numeric_limits<qint64>::min(); }
    static inline qint64 minJd() { return Q_INT64_C(-784350574879); }
    static inline qint64 maxJd() { return Q_INT64_C( 784354017364); }

    qint64 jd;

    friend class QDateTime;
    friend class QDateTimePrivate;
#ifndef QT_NO_DATASTREAM
    friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDate &);
    friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
#endif
};
Q_DECLARE_TYPEINFO(QDate, Q_MOVABLE_TYPE);

class Q_CORE_EXPORT QTime
{
public:
    QTime(): mds(NullTime)
#if defined(Q_OS_WINCE)
        , startTick(NullTime)
#endif
    {}
    QTime(int h, int m, int s = 0, int ms = 0);

    bool isNull() const { return mds == NullTime; }
    bool isValid() const;

    int hour() const;
    int minute() const;
    int second() const;
    int msec() const;
#ifndef QT_NO_DATESTRING
    QString toString(Qt::DateFormat f = Qt::TextDate) const;
    QString toString(const QString &format) const;
#endif
    bool setHMS(int h, int m, int s, int ms = 0);

    QTime addSecs(int secs) const;
    int secsTo(const QTime &) const;
    QTime addMSecs(int ms) const;
    int msecsTo(const QTime &) const;

    bool operator==(const QTime &other) const { return mds == other.mds; }
    bool operator!=(const QTime &other) const { return mds != other.mds; }
    bool operator<(const QTime &other) const { return mds < other.mds; }
    bool operator<=(const QTime &other) const { return mds <= other.mds; }
    bool operator>(const QTime &other) const { return mds > other.mds; }
    bool operator>=(const QTime &other) const { return mds >= other.mds; }

    static QTime currentTime();
#ifndef QT_NO_DATESTRING
    static QTime fromString(const QString &s, Qt::DateFormat f = Qt::TextDate);
    static QTime fromString(const QString &s, const QString &format);
#endif
    static bool isValid(int h, int m, int s, int ms = 0);

    void start();
    int restart();
    int elapsed() const;
private:
    enum TimeFlag { NullTime = -1 };
    inline int ds() const { return mds == -1 ? 0 : mds; }
    int mds;
#if defined(Q_OS_WINCE)
    int startTick;
#endif

    friend class QDateTime;
    friend class QDateTimePrivate;
#ifndef QT_NO_DATASTREAM
    friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QTime &);
    friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
#endif
};
Q_DECLARE_TYPEINFO(QTime, Q_MOVABLE_TYPE);

class QDateTimePrivate;

class Q_CORE_EXPORT QDateTime
{
public:
    QDateTime();
    explicit QDateTime(const QDate &);
    QDateTime(const QDate &, const QTime &, Qt::TimeSpec spec = Qt::LocalTime);
    QDateTime(const QDateTime &other);
    ~QDateTime();

    QDateTime &operator=(const QDateTime &other);

    inline void swap(QDateTime &other) { qSwap(d, other.d); }

    bool isNull() const;
    bool isValid() const;

    QDate date() const;
    QTime time() const;
    Qt::TimeSpec timeSpec() const;
    qint64 toMSecsSinceEpoch() const;
    uint toTime_t() const;
    void setDate(const QDate &date);
    void setTime(const QTime &time);
    void setTimeSpec(Qt::TimeSpec spec);
    void setMSecsSinceEpoch(qint64 msecs);
    void setTime_t(uint secsSince1Jan1970UTC);
#ifndef QT_NO_DATESTRING
    QString toString(Qt::DateFormat f = Qt::TextDate) const;
    QString toString(const QString &format) const;
#endif
    QDateTime addDays(qint64 days) const;
    QDateTime addMonths(int months) const;
    QDateTime addYears(int years) const;
    QDateTime addSecs(qint64 secs) const;
    QDateTime addMSecs(qint64 msecs) const;
    QDateTime toTimeSpec(Qt::TimeSpec spec) const;
    inline QDateTime toLocalTime() const { return toTimeSpec(Qt::LocalTime); }
    inline QDateTime toUTC() const { return toTimeSpec(Qt::UTC); }
    qint64 daysTo(const QDateTime &) const;
    qint64 secsTo(const QDateTime &) const;
    qint64 msecsTo(const QDateTime &) const;

    bool operator==(const QDateTime &other) const;
    inline bool operator!=(const QDateTime &other) const { return !(*this == other); }
    bool operator<(const QDateTime &other) const;
    inline bool operator<=(const QDateTime &other) const { return !(other < *this); }
    inline bool operator>(const QDateTime &other) const { return other < *this; }
    inline bool operator>=(const QDateTime &other) const { return !(*this < other); }

    void setUtcOffset(int seconds);
    int utcOffset() const;

    static QDateTime currentDateTime();
    static QDateTime currentDateTimeUtc();
#ifndef QT_NO_DATESTRING
    static QDateTime fromString(const QString &s, Qt::DateFormat f = Qt::TextDate);
    static QDateTime fromString(const QString &s, const QString &format);
#endif
    static QDateTime fromTime_t(uint secsSince1Jan1970UTC);
    static QDateTime fromMSecsSinceEpoch(qint64 msecs);
    static qint64 currentMSecsSinceEpoch() Q_DECL_NOTHROW;

private:
    friend class QDateTimePrivate;
    void detach();

    // ### Qt6: Using a private here has high impact on runtime
    // on users such as QFileInfo. In Qt 6, the data members
    // should be inlined.
    QExplicitlySharedDataPointer<QDateTimePrivate> d;

#ifndef QT_NO_DATASTREAM
    friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
    friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
#endif
};
Q_DECLARE_SHARED(QDateTime)

#ifndef QT_NO_DATASTREAM
Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDate &);
Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDate &);
Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QTime &);
Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QTime &);
Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QDateTime &);
Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QDateTime &);
#endif // QT_NO_DATASTREAM

#if !defined(QT_NO_DEBUG_STREAM) && !defined(QT_NO_DATESTRING)
Q_CORE_EXPORT QDebug operator<<(QDebug, const QDate &);
Q_CORE_EXPORT QDebug operator<<(QDebug, const QTime &);
Q_CORE_EXPORT QDebug operator<<(QDebug, const QDateTime &);
#endif

// QDateTime is not noexcept for now -- to be revised once
// timezone and calendaring support is added
Q_CORE_EXPORT uint qHash(const QDateTime &key, uint seed = 0);
Q_CORE_EXPORT uint qHash(const QDate &key, uint seed = 0) Q_DECL_NOTHROW;
Q_CORE_EXPORT uint qHash(const QTime &key, uint seed = 0) Q_DECL_NOTHROW;

QT_END_NAMESPACE

#endif // QDATETIME_H
