#include "RimDataSourceSteppingTools.h"

#include "cvfAssert.h"

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimDataSourceSteppingTools::modifyCurrentIndex( caf::PdmValueField*                  valueField,
                                                     const QList<caf::PdmOptionItemInfo>& options,
                                                     int                                  indexOffset )
{
    if ( valueField && !options.isEmpty() )
    {
        QVariant                              currentValue = valueField->toQVariant();
        caf::PdmPointer<caf::PdmObjectHandle> currentHandle = currentValue.value<caf::PdmPointer<caf::PdmObjectHandle>>();
        int                                   currentIndex = -1;
        for ( int i = 0; i < options.size(); i++ )
        {
            QVariant optionValue = options[i].value();
            // First try pointer variety. They are not supported by QVariant::operator==
            caf::PdmPointer<caf::PdmObjectHandle> optionHandle =
                optionValue.value<caf::PdmPointer<caf::PdmObjectHandle>>();
            if ( optionHandle )
            {
                if ( currentHandle == optionHandle )
                {
                    currentIndex = i;
                }
            }
            else if ( currentValue == optionValue )
            {
                currentIndex = i;
            }
        }

        if ( currentIndex == -1 )
        {
            currentIndex = 0;
        }

        int nextIndex = currentIndex + indexOffset;
        if ( nextIndex < options.size() && nextIndex > -1 )
        {
            QVariant newValue = options[nextIndex].value();
            valueField->setFromQVariant( newValue );
            valueField->uiCapability()->notifyFieldChanged( currentValue, newValue );
        }
    }
}