/*=========================================================================

   Library: iMSTK

   Copyright (c) Kitware, Inc. & Center for Modeling, Simulation,
   & Imaging in Medicine, Rensselaer Polytechnic Institute.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0.txt

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

=========================================================================*/

#pragma once

#include <memory>
#include <vector>

namespace imstk
{
class ComputeNode;

///
/// \class InteractionPair
///
/// \brief This class defines an interaction between nodes
///
class InteractionPair
{
public:
    using Inputs  = std::pair<std::vector<std::shared_ptr<ComputeNode>>, std::vector<std::shared_ptr<ComputeNode>>>;
    using Outputs = std::pair<std::vector<std::shared_ptr<ComputeNode>>, std::vector<std::shared_ptr<ComputeNode>>>;

public:
    InteractionPair() = default;
    virtual ~InteractionPair() = default;

public:
    const Inputs& getComputeNodeInputs() const { return m_computeNodeInputs; }
    const Outputs& getComputeNodeOutputs() const { return m_computeNodeOutputs; }

protected:
    Inputs  m_computeNodeInputs;                        ///> The interacting nodes
    Outputs m_computeNodeOutputs;                       ///> The interacting nodes
    std::shared_ptr<ComputeNode> m_interactionFunction; ///> Function to execute on interaction
};
}
