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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 "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:

    SplitByBoneCountProcess();
    ~SplitByBoneCountProcess();

public:
    /** 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;

    /** Called prior to ExecuteOnScene().
    * The function is a request to the process to update its configuration
    * basing on the Importer's configuration property list.
    */
    virtual void SetupProperties(const Importer* pImp);

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);

    /// 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;

public:
    /// 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.
    std::vector< std::vector<unsigned int> > mSubMeshIndices;
};

} // end of namespace Assimp

#endif // !!AI_SPLITBYBONECOUNTPROCESS_H_INC