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#ifndef FAR_MESH_H
#define FAR_MESH_H

#include "../version.h"

#include "../far/subdivisionTables.h"
#include "../far/patchTables.h"
#include "../far/vertexEditTables.h"
#include "../far/kernelBatch.h"

#include <cassert>
#include <vector>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

/// \brief Feature Adaptive Mesh class.
///
/// FarMesh is a serialized instantiation of an HbrMesh. The HbrMesh contains
/// all the topological data in a highly interconnected data structure for 
/// ease of access and modification. When instantiating a FarMesh, the factory
/// analyzes this data structure and serializes the topology into a linear
/// buffers that are ready for efficient parallel processing.
///
template <class U> class FarMesh {
public:

    ~FarMesh();

    /// Returns the subdivision method
    FarSubdivisionTables<U> const * GetSubdivisionTables() const { return _subdivisionTables; }

    /// Returns patch tables
    FarPatchTables const * GetPatchTables() const { return _patchTables; }

    /// Returns the total number of vertices in the mesh across across all depths
    int GetNumVertices() const { return GetSubdivisionTables()->GetNumVertices(); }

    /// Returns the list of vertices in the mesh (from subdiv level 0 to N)
    std::vector<U> & GetVertices() { return _vertices; }

    /// Returns a reference to the vertex at the given index
    ///
    /// @param index the index fo the vertex
    ///
    U & GetVertex(int index) { return _vertices[index]; }

    /// Returns the width of the interleaved face-varying data
    int GetTotalFVarWidth() const { return _totalFVarWidth; }

    /// Returns vertex edit tables
    FarVertexEditTables<U> const * GetVertexEdit() const { return _vertexEditTables; }

    /// Returns the total number of vertices in the mesh across across all depths
    int GetNumPtexFaces() const { return _numPtexFaces; }

    /// True if the mesh tables support the feature-adaptive mode.
    bool IsFeatureAdaptive() const { return _patchTables->IsFeatureAdaptive(); }

    /// Returns an ordered vector of batches of compute kernels. The kernels
    /// describe the sequence of computations required to apply the subdivision
    /// scheme to the vertices in the mesh.    
    const FarKernelBatchVector & GetKernelBatches() const { return _batches; }

private:
    // Note : the vertex classes are renamed <X,Y> so as not to shadow the 
    // declaration of the templated vertex class U.
    template <class X, class Y> friend class FarMeshFactory;
    template <class X, class Y> friend class FarMultiMeshFactory;

    FarMesh() : _subdivisionTables(0), _patchTables(0), _vertexEditTables(0) { }

    // non-copyable, so these are not implemented:
    FarMesh(FarMesh<U> const &);
    FarMesh<U> & operator = (FarMesh<U> const &);

    // subdivision method used in this mesh
    FarSubdivisionTables<U> * _subdivisionTables;

    // tables of vertex indices for feature adaptive patches
    FarPatchTables * _patchTables;

    // hierarchical vertex edit tables
    FarVertexEditTables<U> * _vertexEditTables;

    // kernel execution batches
    FarKernelBatchVector _batches;

    // list of vertices (up to N levels of subdivision)
    std::vector<U> _vertices;

    int _totalFVarWidth;    // width of the face-varying data 

    int _numPtexFaces;
};

template <class U>
FarMesh<U>::~FarMesh()
{
    delete _subdivisionTables;
    delete _patchTables;
    delete _vertexEditTables;
}

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* FAR_MESH_H */