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#include "qatomiccomparators_p.h"

#include "qatomicstring_p.h"

#include "qcomparisonplatform_p.h"

#include "qvaluefactory_p.h"

#include "qcomparisonfactory_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

/**

 * @short Helper class for ComparisonFactory::fromLexical() which exposes

 * CastingPlatform appropriately.

 *

 * @relates ComparisonFactory

 */

class PerformComparison : public ComparisonPlatform<PerformComparison, true>

                        , public SourceLocationReflection

{

public:

    PerformComparison(const SourceLocationReflection *const sourceLocationReflection,

                      const AtomicComparator::Operator op) : m_sourceReflection(sourceLocationReflection)

                                                           , m_operator(op)

    {

        Q_ASSERT(m_sourceReflection);

    }

    bool operator()(const AtomicValue::Ptr &operand1,

                    const AtomicValue::Ptr &operand2,

                    const SchemaType::Ptr &type,

                    const ReportContext::Ptr &context)

    {

        const ItemType::Ptr asItemType((AtomicType::Ptr(type)));

        /* One area where the Query Transform world differs from the Schema

         * world is that @c xs:duration is not considedered comparable, because

         * it's according to Schema is partially comparable. This means

         * ComparisonPlatform::fetchComparator() flags it as impossible, and

         * hence we need to override that.

         *

         * SchemaType::wxsTypeMatches() will return true for sub-types of @c

         * xs:duration as well, but that's ok since AbstractDurationComparator

         * works for them too. */

        if(BuiltinTypes::xsDuration->wxsTypeMatches(type))

            prepareComparison(AtomicComparator::Ptr(new AbstractDurationComparator()));

        else if (BuiltinTypes::xsGYear->wxsTypeMatches(type) ||

                 BuiltinTypes::xsGYearMonth->wxsTypeMatches(type) ||

                 BuiltinTypes::xsGMonth->wxsTypeMatches(type) ||

                 BuiltinTypes::xsGMonthDay->wxsTypeMatches(type) ||

                 BuiltinTypes::xsGDay->wxsTypeMatches(type))

            prepareComparison(AtomicComparator::Ptr(new AbstractDateTimeComparator()));

        else

            prepareComparison(fetchComparator(asItemType, asItemType, context));

        return flexibleCompare(operand1, operand2, context);

    }

    const SourceLocationReflection *actualReflection() const

    {

        return m_sourceReflection;

    }

    AtomicComparator::Operator operatorID() const

    {

        return m_operator;

    }

private:

    const SourceLocationReflection *const m_sourceReflection;

    const AtomicComparator::Operator      m_operator;

};

bool ComparisonFactory::compare(const AtomicValue::Ptr &operand1,

                                const AtomicComparator::Operator op,

                                const AtomicValue::Ptr &operand2,

                                const SchemaType::Ptr &type,

                                const ReportContext::Ptr &context,

                                const SourceLocationReflection *const sourceLocationReflection)

{

    Q_ASSERT(operand1);

    Q_ASSERT(operand2);

    Q_ASSERT(context);

    Q_ASSERT(sourceLocationReflection);

    Q_ASSERT(type);

    Q_ASSERT_X(type->category() == SchemaType::SimpleTypeAtomic, Q_FUNC_INFO,

               "We can only compare atomic values.");

    return PerformComparison(sourceLocationReflection, op)(operand1, operand2, type, context);

}

bool ComparisonFactory::constructAndCompare(const DerivedString<TypeString>::Ptr &operand1,

                                            const AtomicComparator::Operator op,

                                            const DerivedString<TypeString>::Ptr &operand2,

                                            const SchemaType::Ptr &type,

                                            const ReportContext::Ptr &context,

                                            const SourceLocationReflection *const sourceLocationReflection)

{

    Q_ASSERT(operand1);

    Q_ASSERT(operand2);

    Q_ASSERT(context);

    Q_ASSERT(sourceLocationReflection);

    Q_ASSERT(type);

    Q_ASSERT_X(type->category() == SchemaType::SimpleTypeAtomic, Q_FUNC_INFO,

               "We can only compare atomic values.");

    const AtomicValue::Ptr value1 = ValueFactory::fromLexical(operand1->stringValue(), type, context, sourceLocationReflection);

    const AtomicValue::Ptr value2 = ValueFactory::fromLexical(operand2->stringValue(), type, context, sourceLocationReflection);

    return compare(value1, op, value2, type, context, sourceLocationReflection);

}

QT_END_NAMESPACE