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

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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

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** No Commercial Usage

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

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** 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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**

** 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.

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** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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

#include "qabstractduration_p.h"

#include "qabstractdatetime_p.h"

#include "qbase64binary_p.h"

#include "qboolean_p.h"

#include "qdynamiccontext_p.h"

#include "qqnamevalue_p.h"

#include "qatomiccomparators_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

/* -------------------------------------------------- */

AtomicComparator::ComparisonResult

StringComparator::compare(const Item &o1,

                          const AtomicComparator::Operator,

                          const Item &o2) const

{

    const int result = QString::compare(o1.stringValue(), o2.stringValue());

    if(result > 0)

        return GreaterThan;

    else if(result < 0)

        return LessThan;

    else

    {

        Q_ASSERT(result == 0);

        return Equal;

    }

}

bool StringComparator::equals(const Item &o1,

                              const Item &o2) const

{

    return o1.stringValue() == o2.stringValue();

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

AtomicComparator::ComparisonResult

CaseInsensitiveStringComparator::compare(const Item &o1,

                                           const AtomicComparator::Operator,

                                           const Item &o2) const

{

    const QString i1(o1.stringValue().toLower());

    const QString i2(o2.stringValue().toLower());

    const int result = QString::compare(i1, i2);

    if(result > 0)

        return GreaterThan;

    else if(result < 0)

        return LessThan;

    else

    {

        Q_ASSERT(result == 0);

        return Equal;

    }

}

bool CaseInsensitiveStringComparator::equals(const Item &o1,

                                             const Item &o2) const

{

    const QString s1(o1.stringValue());

    const QString s2(o2.stringValue());

    return s1.length() == s2.length() &&

           s1.startsWith(s2, Qt::CaseInsensitive);

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

bool BinaryDataComparator::equals(const Item &o1,

                                  const Item &o2) const

{

    return o1.as<Base64Binary>()->asByteArray() ==

           o2.as<Base64Binary>()->asByteArray();

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

AtomicComparator::ComparisonResult

BooleanComparator::compare(const Item &o1,

                           const AtomicComparator::Operator,

                           const Item &o2) const

{

    /* We know Boolean::evaluateEBV doesn't use the DynamicContext. */

    const bool v1 = o1.as<AtomicValue>()->evaluateEBV(QExplicitlySharedDataPointer<DynamicContext>());

    const bool v2 = o2.as<AtomicValue>()->evaluateEBV(QExplicitlySharedDataPointer<DynamicContext>());

    if(v1 == v2)

        return Equal;

    else if(v1 == false)

    {

        Q_ASSERT(v2 == true);

        return LessThan;

    }

    else

    {

        Q_ASSERT(v1 == true && v2 == false);

        return GreaterThan;

    }

}

bool BooleanComparator::equals(const Item &o1,

                               const Item &o2) const

{

    /* Boolean is an atomic class. */

    return o1.as<AtomicValue>() == o2.as<AtomicValue>();

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

AtomicComparator::ComparisonResult

AbstractFloatComparator::compare(const Item &o1,

                                 const AtomicComparator::Operator op,

                                 const Item &o2) const

{

    const xsDouble v1 = o1.as<Numeric>()->toDouble();

    const xsDouble v2 = o2.as<Numeric>()->toDouble();

    if(Double::isEqual(v1, v2))

        return Equal;

    else if(v1 < v2)

        return LessThan;

    else if(v1 > v2)

        return GreaterThan;

    else

    {

        /* We have NaN values. Make sure we don't return a result which would

         * signify success for the operator in question. */

        if((op & OperatorGreaterThan) == OperatorGreaterThan)

            return LessThan;

        else

        {

            Q_ASSERT((op & OperatorLessThan) == OperatorLessThan);

            return GreaterThan;

        }

    }

}

bool AbstractFloatComparator::equals(const Item &o1,

                                     const Item &o2) const

{

    return Double::isEqual(o1.as<Numeric>()->toDouble(), o2.as<Numeric>()->toDouble());

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

AtomicComparator::ComparisonResult

DecimalComparator::compare(const Item &o1,

                           const AtomicComparator::Operator,

                           const Item &o2) const

{

    const xsDecimal v1 = o1.as<Numeric>()->toDecimal();

    const xsDecimal v2 = o2.as<Numeric>()->toDecimal();

    if(Double::isEqual(v1, v2))

        return Equal;

    else if(v1 < v2)

        return LessThan;

    else

        return GreaterThan;

}

bool DecimalComparator::equals(const Item &o1,

                               const Item &o2) const

{

    return Double::isEqual(o1.as<Numeric>()->toDecimal(), o2.as<Numeric>()->toDecimal());

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

AtomicComparator::ComparisonResult

IntegerComparator::compare(const Item &o1,

                           const AtomicComparator::Operator,

                           const Item &o2) const

{

    const Numeric *const num1 = o1.as<Numeric>();

    const Numeric *const num2 = o1.as<Numeric>();

    /**

     * Consider:

     *  xs:unsignedLong("100") > xs:unsignedLong("18446744073709551615")

     *

     * If we perform math on the values as if they were xsInteger, the right

     * operand overflows, wraps around, and the expression evaluates to false.

     * Hence we have this code to deal with it.

     *

     * This is runtime code, it would have been better if we had separate

     * AtomicComparator classes for signed and unsigned values, but the changes

     * required to the lookup code are extensive.

     */

    if(num1->isSigned() || num2->isSigned())

    {

        const xsInteger v1 = o1.as<Numeric>()->toInteger();

        const xsInteger v2 = o2.as<Numeric>()->toInteger();

        if(v1 == v2)

            return Equal;

        else if(v1 < v2)

            return LessThan;

        else

            return GreaterThan;

    }

    else

    {

        const qulonglong v1 = o1.as<Numeric>()->toUnsignedInteger();

        const qulonglong v2 = o2.as<Numeric>()->toUnsignedInteger();

        if(v1 == v2)

            return Equal;

        else if(v1 < v2)

            return LessThan;

        else

            return GreaterThan;

    }

}

bool IntegerComparator::equals(const Item &o1,

                               const Item &o2) const

{

    return o1.as<Numeric>()->toInteger() == o2.as<Numeric>()->toInteger();

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

bool QNameComparator::equals(const Item &o1,

                             const Item &o2) const

{

    return o1.as<QNameValue>()->m_qName ==

           o2.as<QNameValue>()->m_qName;

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

bool AbstractDateTimeComparator::equals(const Item &o1,

                                        const Item &o2) const

{

    const QDateTime dt1(o1.as<AbstractDateTime>()->toDateTime());

    const QDateTime dt2(o2.as<AbstractDateTime>()->toDateTime());

    /*

    pDebug() << "COMPARING:"

        << o1->as<AbstractDateTime>()->toDateTime().toString()

           << o2->as<AbstractDateTime>()->toDateTime().toString();

    pDebug() << "DATE ONLY:"

        << o1->as<AbstractDateTime>()->toDateTime().isDateOnly()

           << o2->as<AbstractDateTime>()->toDateTime().isDateOnly();

           */

    return dt1 == dt2 &&

           dt1.timeSpec() == dt2.timeSpec();

}

AtomicComparator::ComparisonResult

AbstractDateTimeComparator::compare(const Item &operand1,

                                    const AtomicComparator::Operator,

                                    const Item &operand2) const

{

    const QDateTime &dt1 = operand1.as<AbstractDateTime>()->toDateTime();

    const QDateTime &dt2 = operand2.as<AbstractDateTime>()->toDateTime();

    if(dt1 == dt2)

        return Equal;

    else if(dt1 < dt2)

        return LessThan;

    else

        return GreaterThan;

}

/* -------------------------------------------------- */

/* -------------------------------------------------- */

bool AbstractDurationComparator::equals(const Item &o1,

                                        const Item &o2) const

{

    /* We use AbstractDuration::operator==() */

    return *o1.as<AbstractDuration>() ==

           *o2.as<AbstractDuration>();

}

QDateTime AbstractDurationComparator::addDurationToDateTime(const QDateTime &dateTime,

                                                            const AbstractDuration *const duration)

{

    QDateTime result(dateTime);

    qint64 seconds = 0;

    const qint8 signMultiplier = (duration->isPositive() ? 1 : -1);

    result = result.addYears(signMultiplier * duration->years());

    result = result.addMonths(signMultiplier * duration->months());

    result = result.addDays(signMultiplier * duration->days());

    seconds =  60 * 60 * duration->hours();

    seconds += 60 * duration->minutes();

    seconds += duration->seconds();

    result = result.addSecs(signMultiplier * seconds);

    result = result.addMSecs(signMultiplier * duration->mseconds());

    return result;

}

AtomicComparator::ComparisonResult

AbstractDurationComparator::compare(const Item &o1,

                                    const AtomicComparator::Operator,

                                    const Item &o2) const

{

    const AbstractDuration *const duration = o1.as<AbstractDuration>();

    const AbstractDuration *const otherDuration = o2.as<AbstractDuration>();

    const QDateTime dateTime1(QDate(1696, 9, 1), QTime(0, 0, 0), Qt::UTC);

    const QDateTime dateTime2(QDate(1697, 2, 1), QTime(0, 0, 0), Qt::UTC);

    const QDateTime dateTime3(QDate(1903, 3, 1), QTime(0, 0, 0), Qt::UTC);

    const QDateTime dateTime4(QDate(1903, 7, 1), QTime(0, 0, 0), Qt::UTC);

    const QDateTime durationDateTime1 = addDurationToDateTime(dateTime1, duration);

    const QDateTime durationDateTime2 = addDurationToDateTime(dateTime2, duration);

    const QDateTime durationDateTime3 = addDurationToDateTime(dateTime3, duration);

    const QDateTime durationDateTime4 = addDurationToDateTime(dateTime4, duration);

    const QDateTime otherDurationDateTime1 = addDurationToDateTime(dateTime1, otherDuration);

    const QDateTime otherDurationDateTime2 = addDurationToDateTime(dateTime2, otherDuration);

    const QDateTime otherDurationDateTime3 = addDurationToDateTime(dateTime3, otherDuration);

    const QDateTime otherDurationDateTime4 = addDurationToDateTime(dateTime4, otherDuration);

    if (durationDateTime1 > otherDurationDateTime1 &&

        durationDateTime2 > otherDurationDateTime2 &&

        durationDateTime3 > otherDurationDateTime3 &&

        durationDateTime4 > otherDurationDateTime4) {

        return GreaterThan;

    } else if (durationDateTime1 < otherDurationDateTime1 &&

               durationDateTime2 < otherDurationDateTime2 &&

               durationDateTime3 < otherDurationDateTime3 &&

               durationDateTime4 < otherDurationDateTime4) {

        return LessThan;

    } else if (*duration == *otherDuration) {

        return Equal;

    } else {

        return Incomparable;

    }

}

/* -------------------------------------------------- */

QT_END_NAMESPACE