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/// @file SplitByBoneCountProcess.h

/// Defines a post processing step to split meshes with many bones into submeshes

#ifndef AI_SPLITBYBONECOUNTPROCESS_H_INC

#define AI_SPLITBYBONECOUNTPROCESS_H_INC

#include <vector>

#include "Common/BaseProcess.h"

#include <assimp/mesh.h>

#include <assimp/scene.h>

namespace Assimp {

/** Postprocessing filter to split meshes with many bones into submeshes

 * so that each submesh has a certain max bone count.

 *

 * Applied BEFORE the JoinVertices-Step occurs.

 * Returns NON-UNIQUE vertices, splits by bone count.

*/

class SplitByBoneCountProcess : public BaseProcess {

public:

    // -------------------------------------------------------------------

    /// The default class constructor / destructor.

    SplitByBoneCountProcess();

    ~SplitByBoneCountProcess() override = default;

    /// @brief Returns whether the processing step is present in the given flag.

    /// @param pFlags The processing flags the importer was called with. A

    ///        bitwise combination of #aiPostProcessSteps.

    /// @return true if the process is present in this flag fields, false if not.

    bool IsActive( unsigned int pFlags) const override;

    /// @brief Called prior to ExecuteOnScene().

    /// The function is a request to the process to update its configuration

    /// basing on the Importer's configuration property list.

    void SetupProperties(const Importer* pImp) override;

    /// @brief Will return the maximal number of bones.

    /// @return The maximal number of bones.

    size_t getMaxNumberOfBones() const;

protected:

    /// Executes the post processing step on the given imported data.

    /// At the moment a process is not supposed to fail.

    /// @param pScene The imported data to work at.

    void Execute( aiScene* pScene) override;

    /// Splits the given mesh by bone count.

    /// @param pMesh the Mesh to split. Is not changed at all, but might be superfluous in case it was split.

    /// @param poNewMeshes Array of submeshes created in the process. Empty if splitting was not necessary.

    void SplitMesh( const aiMesh* pMesh, std::vector<aiMesh*>& poNewMeshes) const;

    /// Recursively updates the node's mesh list to account for the changed mesh list

    void UpdateNode( aiNode* pNode) const;

private:

    /// Max bone count. Splitting occurs if a mesh has more than that number of bones.

    size_t mMaxBoneCount;

    /// Per mesh index: Array of indices of the new submeshes.

    using IndexArray = std::vector<unsigned int>;

    std::vector<IndexArray> mSubMeshIndices;

};

inline size_t SplitByBoneCountProcess::getMaxNumberOfBones() const {

    return mMaxBoneCount;

}

} // end of namespace Assimp

#endif // !!AI_SPLITBYBONECOUNTPROCESS_H_INC