/****************************************************************************

**

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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

** Alternatively, 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

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****************************************************************************/

#include <QStringList>

#include "qbuiltintypes_p.h"

#include "qitem_p.h"

#include "qpatternistlocale_p.h"

#include "qvalidationerror_p.h"

#include "qabstractdatetime_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

AbstractDateTime::AbstractDateTime(const QDateTime &dateTime) : m_dateTime(dateTime)

{

    Q_ASSERT(dateTime.isValid());

}

#define badData(msg)        errorMessage = ValidationError::createError(msg); return QDateTime()

#define getCapt(sym)        ((captTable.sym == -1) ? QString() : capts.at(captTable.sym))

#define getSafeCapt(sym)    ((captTable.sym == -1) ? QString() : capts.value(captTable.sym))

QDateTime AbstractDateTime::create(AtomicValue::Ptr &errorMessage,

                                   const QString &lexicalSource,

                                   const CaptureTable &captTable)

{

    QRegExp myExp(captTable.regExp);

    if(!myExp.exactMatch(lexicalSource))

    {

        badData(QString());

    }

    const QStringList capts(myExp.capturedTexts());

    const QString yearStr(getCapt(year));

    if(yearStr.size() > 4 && yearStr.at(0) == QLatin1Char('0'))

    {

        badData(QtXmlPatterns::tr("Year %1 is invalid because it begins with %2.")

                .arg(formatData(yearStr)).arg(formatData("0")));

    }

    /* If the strings are empty, load default values which are

     * guranteed to pass the validness tests. */

    const QString monthStr(getCapt(month));

    const QString dayStr(getCapt(day));

    YearProperty year = yearStr.isEmpty() ? DefaultYear : yearStr.toInt();

    if(getCapt(yearSign) == QChar::fromLatin1('-'))

        year = -year;

    const MonthProperty month = monthStr.isEmpty() ? DefaultMonth : monthStr.toInt();

    const MonthProperty day = dayStr.isEmpty() ? DefaultDay : dayStr.toInt();

    if(!QDate::isValid(year, month, day))

    {

        /* Try to give an intelligent message. */

        if(day > 31 || day < 1)

        {

            badData(QtXmlPatterns::tr("Day %1 is outside the range %2..%3.")

                    .arg(formatData(QString::number(day)))

                    .arg(formatData("01"))

                    .arg(formatData("31")));

        }

        else if(month > 12 || month < -12 || month == 0)

        {

            badData(QtXmlPatterns::tr("Month %1 is outside the range %2..%3.")

                    .arg(month)

                    .arg(formatData("01"))

                    .arg(formatData("12")));

        }

        else if(QDate::isValid(DefaultYear, month, day))

        {

            /* We can't use the badData() macro here because we need a different

             * error code: FODT0001 instead of FORG0001. */

            errorMessage = ValidationError::createError(QtXmlPatterns::tr(

                               "Overflow: Can't represent date %1.")

                               .arg(formatData(QLatin1String("%1-%2-%3"))

                                    .arg(year).arg(month).arg(day)),

                               ReportContext::FODT0001);

            return QDateTime();

        }

        else

        {

            badData(QtXmlPatterns::tr("Day %1 is invalid for month %2.")

                         .arg(formatData(QString::number(day)))

                         .arg(formatData(QString::number(month))));

        }

    }

    /* Parse the zone offset. */

    ZoneOffsetParseResult zoResult;

    const ZOTotal offset = parseZoneOffset(zoResult, capts, captTable);

    if(zoResult == Error)

    {

        errorMessage = ValidationError::createError();

        /* We encountered an error, so stop processing. */

        return QDateTime();

    }

    QDate date(year, month, day);

    /* Only deal with time if time is needed. */

    if(captTable.hour == -1)

    {

        QDateTime result(date);

        setUtcOffset(result, zoResult, offset);

        return result;

    }

    else

    {

        /* Now, it's time for the time-part.

         *

         * If the strings are empty, toInt() will return 0, which

         * in all cases is valid properties. */

        const QString hourStr(getCapt(hour));

        const QString minutesStr(getCapt(minutes));

        const QString secondsStr(getCapt(seconds));

        HourProperty hour = hourStr.toInt();

        const MinuteProperty mins = minutesStr.toInt();

        const SecondProperty secs = secondsStr.toInt();

        QString msecondsStr(getSafeCapt(mseconds));

        if(!msecondsStr.isEmpty())

            msecondsStr = msecondsStr.leftJustified(3, QLatin1Char('0'));

        const MSecondProperty msecs = msecondsStr.toInt();

        if(hour == 24)

        {

            /* 24:00:00.00 is an invalid time for QTime, so handle it here. */

            if(mins != 0 || secs != 0 || msecs != 0)

            {

                badData(QtXmlPatterns::tr("Time 24:%1:%2.%3 is invalid. "

                                          "Hour is 24, but minutes, seconds, "

                                          "and milliseconds are not all 0; ")

                        .arg(mins).arg(secs).arg(msecs));

            }

            else

            {

                hour = 0;

                date = date.addDays(1);

            }

        }

        else if(!QTime::isValid(hour, mins, secs, msecs))

        {

            badData(QtXmlPatterns::tr("Time %1:%2:%3.%4 is invalid.")

                         .arg(hour).arg(mins).arg(secs).arg(msecs));

        }

        const QTime time(hour, mins, secs, msecs);

        Q_ASSERT(time.isValid());

        QDateTime result(date, time);

        setUtcOffset(result, zoResult, offset);

        return result;

    }

}

ZOTotal AbstractDateTime::parseZoneOffset(ZoneOffsetParseResult &result,

                                          const QStringList &capts,

                                          const CaptureTable &captTable)

{

    const QString zoneOffsetSignStr(getCapt(zoneOffsetSign));

    if(zoneOffsetSignStr.isEmpty())

    {

        const QString zoneOffsetUTCStr(getCapt(zoneOffsetUTCSymbol));

        Q_ASSERT(zoneOffsetUTCStr.isEmpty() || zoneOffsetUTCStr == QLatin1String("Z"));

        if(zoneOffsetUTCStr.isEmpty())

            result = LocalTime;

        else

            result = UTC;

        return 0;

    }

    Q_ASSERT(zoneOffsetSignStr == QLatin1String("-") || zoneOffsetSignStr == QLatin1String("+"));

    const QString zoneOffsetHourStr(getCapt(zoneOffsetHour));

    Q_ASSERT(!zoneOffsetHourStr.isEmpty());

    const ZOHourProperty zoHour = zoneOffsetHourStr.toInt();

    if(zoHour > 14 || zoHour < -14)

    {

        result = Error;

        return 0;

        /*

        badZOData(QtXmlPatterns::tr("%1 it is not a valid hour property in a zone offset. "

                       "It must be less than or equal to 14.").arg(zoHour));

                       */

    }

    const QString zoneOffsetMinuteStr(getCapt(zoneOffsetMinute));

    Q_ASSERT(!zoneOffsetMinuteStr.isEmpty());

    const ZOHourProperty zoMins = zoneOffsetMinuteStr.toInt();

    if(zoHour == 14 && zoMins != 0)

    {

        /*

        badZOData(QtXmlPatterns::tr("When the hour property in a zone offset is 14, the minute property "

                       "must be 0, not %1.").arg(zoMins));

                       */

        result = Error;

        return 0;

    }

    else if(zoMins > 59 || zoMins < -59)

    {

        /*

        badZOData(QtXmlPatterns::tr("The minute property in a zone offset cannot be larger than 59. "

                       "%1 is therefore invalid.").arg(zoMins));

                       */

        result = Error;

        return 0;

    }

    if(zoHour == 0 && zoMins == 0) /* "-00:00" and "+00:00" is equal to 'Z'. */

    {

        result = UTC;

        return 0;

    }

    else

    {

        ZOTotal zoneOffset = (zoHour * 60 + zoMins) * 60;

        if(zoneOffsetSignStr == QChar::fromLatin1('-'))

            zoneOffset = -zoneOffset;

        result = Offset;

        return zoneOffset;

    }

}

//#undef badZOData

void AbstractDateTime::setUtcOffset(QDateTime &result,

                                     const ZoneOffsetParseResult zoResult,

                                     const int zoOffset)

{

    if(zoResult == UTC)

        result.setTimeSpec(Qt::UTC);

    else if(zoResult == LocalTime)

        result.setTimeSpec(Qt::LocalTime);

    else

    {

        Q_ASSERT(zoResult == Offset);

        result.setUtcOffset(zoOffset);

    }

}

#undef badData

#undef getCapt

#undef getSafeCapt

bool AbstractDateTime::isRangeValid(const QDate &date,

                                    QString &message)

{

    if(date.isValid())

        return true;

    else

    {

        message = QtXmlPatterns::tr("Overflow: Date can't be represented.");

        return false;

    }

}

QString AbstractDateTime::dateToString() const

{

    return m_dateTime.toString(QLatin1String("yyyy-MM-dd"));

}

QString AbstractDateTime::serializeMSeconds(const MSecondProperty mseconds)

{

    QString retval;

    retval.append(QLatin1Char('.'));

    int div = 100;

    MSecondProperty msecs = mseconds;

    while(msecs > 0)

    {

        int d = msecs / div;

        retval.append(QLatin1Char(d + '0'));

        msecs = msecs % div;

        div = div / 10;

    }

    return retval;

}

QString AbstractDateTime::timeToString() const

{

    QString base(m_dateTime.toString(QLatin1String("hh:mm:ss")));

    const MSecondProperty msecs = m_dateTime.time().msec();

    if(msecs)

        base.append(serializeMSeconds(msecs));

    return base;

}

QString AbstractDateTime::zoneOffsetToString() const

{

    switch(m_dateTime.timeSpec())

    {

        case Qt::LocalTime:

            return QString();

        case Qt::UTC:

            return QLatin1String("Z");

        default:

        {

            Q_ASSERT(m_dateTime.timeSpec() == Qt::OffsetFromUTC);

            const int zoneOffset = m_dateTime.utcOffset();

            Q_ASSERT(zoneOffset != 0);

            const int posZoneOffset = qAbs(zoneOffset);

            /* zoneOffset is in seconds. */

            const int hours = posZoneOffset/(60 * 60);

            const int minutes = (posZoneOffset % (60 * 60)) / 60;

            QString result;

            result.reserve(6);

            result.append(zoneOffset < 0 ? QLatin1Char('-') : QLatin1Char('+'));

            result.append(QString::number(hours).rightJustified(2, QLatin1Char('0')));

            result.append(QLatin1Char(':'));

            result.append(QString::number(minutes).rightJustified(2, QLatin1Char('0')));

            return result;

        }

    }

}

void AbstractDateTime::copyTimeSpec(const QDateTime &from,

                                    QDateTime &to)

{

    switch(from.timeSpec())

    {

        case Qt::UTC:

        /* Fallthrough. */

        case Qt::LocalTime:

        {

            to.setTimeSpec(from.timeSpec());

            return;

        }

        case Qt::OffsetFromUTC:

        {

            to.setUtcOffset(from.utcOffset());

            Q_ASSERT(to.timeSpec() == Qt::OffsetFromUTC);

            return;

        }

    }

}

Item AbstractDateTime::fromValue(const QDateTime &) const

{

    Q_ASSERT_X(false, Q_FUNC_INFO,

               "Calling AbstractDateTime::fromDateTime() makes no sense.");

    return Item();

}

QT_END_NAMESPACE