////////////////////////////////////////////////////////////////////////////////////////
//
//  Copyright 2026 OVITO GmbH, Germany
//
//  This file is part of OVITO (Open Visualization Tool).
//
//  OVITO is free software; you can redistribute it and/or modify it either under the
//  terms of the GNU General Public License version 3 as published by the Free Software
//  Foundation (the "GPL") or, at your option, under the terms of the MIT License.
//  If you do not alter this notice, a recipient may use your version of this
//  file under either the GPL or the MIT License.
//
//  You should have received a copy of the GPL along with this program in a
//  file LICENSE.GPL.txt.  You should have received a copy of the MIT License along
//  with this program in a file LICENSE.MIT.txt
//
//  This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
//  either express or implied. See the GPL or the MIT License for the specific language
//  governing rights and limitations.
//
////////////////////////////////////////////////////////////////////////////////////////

#include <ovito/grid/Grid.h>
#include <ovito/grid/objects/VoxelGrid.h>
#include <ovito/stdobj/simcell/SimulationCell.h>
#include <ovito/core/dataset/pipeline/ModificationNode.h>
#include "VoxelGridAffineTransformationModifierDelegate.h"

namespace Ovito {

IMPLEMENT_CREATABLE_OVITO_CLASS(VoxelGridAffineTransformationModifierDelegate);
OVITO_CLASSINFO(VoxelGridAffineTransformationModifierDelegate, "DisplayName", "Voxel grids");

/******************************************************************************
* Indicates which data objects in the given input data collection the modifier
* delegate is able to operate on.
******************************************************************************/
QVector<DataObjectReference> VoxelGridAffineTransformationModifierDelegate::OOMetaClass::getApplicableObjects(const DataCollection& input) const
{
    // Gather list of all voxel grids in the input data collection.
    QVector<DataObjectReference> objects;
    for(const ConstDataObjectPath& path : input.getObjectsRecursive(VoxelGrid::OOClass())) {
        objects.push_back(path);
    }
    return objects;
}

/******************************************************************************
* Applies the modifier operation to the data in a pipeline flow state.
******************************************************************************/
Future<PipelineFlowState> VoxelGridAffineTransformationModifierDelegate::apply(const ModifierEvaluationRequest& request, PipelineFlowState&& state, const PipelineFlowState& originalState, const std::vector<std::reference_wrapper<const PipelineFlowState>>& additionalInputs)
{
    AffineTransformationModifier* modifier = static_object_cast<AffineTransformationModifier>(request.modifier());

    // Transform the spatial domains of all VoxelGrid objects.
    visitObjectsToBeProcessed<VoxelGrid>(state, inputDataObject(), request.modificationNodeWeak(), [&](const VoxelGrid* existingObject) {
        if(existingObject->domain()) {

            // Determine transformation matrix.
            const AffineTransformation tm = modifier->effectiveAffineTransformation(originalState);

            VoxelGrid* newObject = state.makeMutable(existingObject);
            newObject->mutableDomain()->setCellMatrix(tm * existingObject->domain()->cellMatrix());
        }
    });

    return std::move(state);
}

}   // End of namespace
