/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** 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
** 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 met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QDATETIME_P_H
#define QDATETIME_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qplatformdefs.h"
#include "QtCore/qatomic.h"
#include "QtCore/qdatetime.h"
#include "QtCore/qstringlist.h"
#include "QtCore/qlocale.h"
#ifndef QT_BOOTSTRAPPED
# include "QtCore/qvariant.h"
#endif
#include "QtCore/qvector.h"


#define QDATETIMEEDIT_TIME_MIN QTime(0, 0, 0, 0)
#define QDATETIMEEDIT_TIME_MAX QTime(23, 59, 59, 999)
#define QDATETIMEEDIT_DATE_MIN QDate(100, 1, 1)
#define QDATETIMEEDIT_COMPAT_DATE_MIN QDate(1752, 9, 14)
#define QDATETIMEEDIT_DATE_MAX QDate(7999, 12, 31)
#define QDATETIMEEDIT_DATETIME_MIN QDateTime(QDATETIMEEDIT_DATE_MIN, QDATETIMEEDIT_TIME_MIN)
#define QDATETIMEEDIT_COMPAT_DATETIME_MIN QDateTime(QDATETIMEEDIT_COMPAT_DATE_MIN, QDATETIMEEDIT_TIME_MIN)
#define QDATETIMEEDIT_DATETIME_MAX QDateTime(QDATETIMEEDIT_DATE_MAX, QDATETIMEEDIT_TIME_MAX)
#define QDATETIMEEDIT_DATE_INITIAL QDate(2000, 1, 1)

QT_BEGIN_NAMESPACE

class QDateTimePrivate : public QSharedData
{
public:
    enum Spec { LocalUnknown = -1, LocalStandard = 0, LocalDST = 1, UTC = 2, OffsetFromUTC = 3};

    QDateTimePrivate() : spec(LocalUnknown), utcOffset(0) {}
    QDateTimePrivate(const QDateTimePrivate &other)
        : QSharedData(other), date(other.date), time(other.time), spec(other.spec), utcOffset(other.utcOffset)
    {}

    QDate date;
    QTime time;
    Spec spec;
    /*!
      \internal
      \since 4.4

      The offset in seconds. Applies only when timeSpec() is OffsetFromUTC.
     */
    int utcOffset;

    Spec getLocal(QDate &outDate, QTime &outTime) const;
    void getUTC(QDate &outDate, QTime &outTime) const;
    static QDateTime addMSecs(const QDateTime &dt, qint64 msecs);
    static void addMSecs(QDate &utcDate, QTime &utcTime, qint64 msecs);
};

#ifndef QT_BOOTSTRAPPED

class Q_CORE_EXPORT QDateTimeParser
{
public:
    enum Context {
        FromString,
        DateTimeEdit
    };
    QDateTimeParser(QVariant::Type t, Context ctx)
        : currentSectionIndex(-1), display(0), cachedDay(-1), parserType(t),
        fixday(false), spec(Qt::LocalTime), context(ctx)
    {
        defaultLocale = QLocale::system();
        first.type = FirstSection;
        first.pos = -1;
        first.count = -1;
        first.zeroesAdded = 0;
        last.type = FirstSection;
        last.pos = -1;
        last.count = -1;
        last.zeroesAdded = 0;
        none.type = NoSection;
        none.pos = -1;
        none.count = -1;
        none.zeroesAdded = 0;
    }
    virtual ~QDateTimeParser() {}
    enum {
        Neither = -1,
        AM = 0,
        PM = 1,
        PossibleAM = 2,
        PossiblePM = 3,
        PossibleBoth = 4
    };

    enum Section {
        NoSection = 0x00000,
        AmPmSection = 0x00001,
        MSecSection = 0x00002,
        SecondSection = 0x00004,
        MinuteSection = 0x00008,
        Hour12Section   = 0x00010,
        Hour24Section   = 0x00020,
        TimeSectionMask = (AmPmSection|MSecSection|SecondSection|MinuteSection|Hour12Section|Hour24Section),
        Internal = 0x10000,
        DaySection = 0x00100,
        MonthSection = 0x00200,
        YearSection = 0x00400,
        YearSection2Digits = 0x00800,
        DayOfWeekSectionShort = 0x01000,
        DayOfWeekSectionLong = 0x20000,
        DateSectionMask = (DaySection|MonthSection|YearSection|YearSection2Digits|DayOfWeekSectionShort|DayOfWeekSectionLong),
        FirstSection = 0x02000|Internal,
        LastSection = 0x04000|Internal,
        CalendarPopupSection = 0x08000|Internal,

        NoSectionIndex = -1,
        FirstSectionIndex = -2,
        LastSectionIndex = -3,
        CalendarPopupIndex = -4
    }; // duplicated from qdatetimeedit.h
    Q_DECLARE_FLAGS(Sections, Section)

    struct SectionNode {
        Section type;
        mutable int pos;
        int count;
        int zeroesAdded;
    };

    enum State { // duplicated from QValidator
        Invalid,
        Intermediate,
        Acceptable
    };

    struct StateNode {
        StateNode() : state(Invalid), conflicts(false) {}
        QString input;
        State state;
        bool conflicts;
        QDateTime value;
    };

    enum AmPm {
        AmText,
        PmText
    };

    enum Case {
        UpperCase,
        LowerCase
    };

#ifndef QT_NO_DATESTRING
    StateNode parse(QString &input, int &cursorPosition, const QDateTime &currentValue, bool fixup) const;
#endif
    int sectionMaxSize(int index) const;
    int sectionSize(int index) const;
    int sectionMaxSize(Section s, int count) const;
    int sectionPos(int index) const;
    int sectionPos(const SectionNode &sn) const;

    const SectionNode &sectionNode(int index) const;
    Section sectionType(int index) const;
    QString sectionText(int sectionIndex) const;
    QString sectionText(const QString &text, int sectionIndex, int index) const;
    int getDigit(const QDateTime &dt, int index) const;
    bool setDigit(QDateTime &t, int index, int newval) const;
    int parseSection(const QDateTime &currentValue, int sectionIndex, QString &txt, int &cursorPosition,
                     int index, QDateTimeParser::State &state, int *used = 0) const;
    int absoluteMax(int index, const QDateTime &value = QDateTime()) const;
    int absoluteMin(int index) const;
    bool parseFormat(const QString &format);
#ifndef QT_NO_DATESTRING
    bool fromString(const QString &text, QDate *date, QTime *time) const;
#endif

#ifndef QT_NO_TEXTDATE
    int findMonth(const QString &str1, int monthstart, int sectionIndex,
                  QString *monthName = 0, int *used = 0) const;
    int findDay(const QString &str1, int intDaystart, int sectionIndex,
                QString *dayName = 0, int *used = 0) const;
#endif
    int findAmPm(QString &str1, int index, int *used = 0) const;
    int maxChange(int s) const;
    bool potentialValue(const QString &str, int min, int max, int index,
                        const QDateTime &currentValue, int insert) const;
    bool skipToNextSection(int section, const QDateTime &current, const QString &sectionText) const;
    QString sectionName(int s) const;
    QString stateName(int s) const;

    QString sectionFormat(int index) const;
    QString sectionFormat(Section s, int count) const;

    enum FieldInfoFlag {
        Numeric = 0x01,
        FixedWidth = 0x02,
        AllowPartial = 0x04,
        Fraction = 0x08
    };
    Q_DECLARE_FLAGS(FieldInfo, FieldInfoFlag)

    FieldInfo fieldInfo(int index) const;

    virtual QDateTime getMinimum() const;
    virtual QDateTime getMaximum() const;
    virtual int cursorPosition() const { return -1; }
    virtual QString displayText() const { return text; }
    virtual QString getAmPmText(AmPm ap, Case cs) const;
    virtual QLocale locale() const { return defaultLocale; }

    mutable int currentSectionIndex;
    Sections display;
    /*
        This stores the stores the most recently selected day.
        It is useful when considering the following scenario:

        1. Date is: 31/01/2000
        2. User increments month: 29/02/2000
        3. User increments month: 31/03/2000

        At step 1, cachedDay stores 31. At step 2, the 31 is invalid for February, so the cachedDay is not updated.
        At step 3, the the month is changed to March, for which 31 is a valid day. Since 29 < 31, the day is set to cachedDay.
        This is good for when users have selected their desired day and are scrolling up or down in the month or year section
        and do not want smaller months (or non-leap years) to alter the day that they chose.
    */
    mutable int cachedDay;
    mutable QString text;
    QVector<SectionNode> sectionNodes;
    SectionNode first, last, none, popup;
    QStringList separators;
    QString displayFormat;
    QLocale defaultLocale;
    QVariant::Type parserType;

    bool fixday;

    Qt::TimeSpec spec; // spec if used by QDateTimeEdit
    Context context;
};

Q_CORE_EXPORT bool operator==(const QDateTimeParser::SectionNode &s1, const QDateTimeParser::SectionNode &s2);

Q_DECLARE_OPERATORS_FOR_FLAGS(QDateTimeParser::Sections)
Q_DECLARE_OPERATORS_FOR_FLAGS(QDateTimeParser::FieldInfo)

#endif // QT_BOOTSTRAPPED

QT_END_NAMESPACE

#endif // QDATETIME_P_H