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#ifndef FAR_BILINEAR_SUBDIVISION_TABLES_FACTORY_H
#define FAR_BILINEAR_SUBDIVISION_TABLES_FACTORY_H

#include "../version.h"

#include "../far/bilinearSubdivisionTables.h"
#include "../far/meshFactory.h"
#include "../far/subdivisionTablesFactory.h"

#include <cassert>
#include <vector>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

template <class T, class U> class FarMeshFactory;

/// \brief A specialized factory for FarBilinearSubdivisionTables
///
/// Separating the factory allows us to isolate Far data structures from Hbr dependencies.
///
template <class T, class U> class FarBilinearSubdivisionTablesFactory {
protected:
    template <class X, class Y> friend class FarMeshFactory;

    /// Creates a FarBilinearSubdivisiontables instance.
    static FarBilinearSubdivisionTables<U> * Create( FarMeshFactory<T,U> * meshFactory, FarMesh<U> * farMesh );
};

// This factory walks the Hbr vertices and accumulates the weights and adjacency
// (valance) information specific to the bilinear subdivision scheme. The results
// are stored in a FarBilinearSubdivisionTable<U>
template <class T, class U> FarBilinearSubdivisionTables<U> * 
FarBilinearSubdivisionTablesFactory<T,U>::Create( FarMeshFactory<T,U> * meshFactory, FarMesh<U> * farMesh ) {

    assert( meshFactory and farMesh );
     
    int maxlevel = meshFactory->GetMaxLevel();
    
    std::vector<int> & remap = meshFactory->getRemappingTable();
    
    FarSubdivisionTablesFactory<T,U> tablesFactory( meshFactory->GetHbrMesh(),  maxlevel, remap );

    FarBilinearSubdivisionTables<U> * result = new FarBilinearSubdivisionTables<U>(farMesh, maxlevel);

    // Allocate memory for the indexing tables
    result->_F_ITa.Resize(tablesFactory.GetNumFaceVerticesTotal(maxlevel)*2);
    result->_F_IT.Resize(tablesFactory.GetFaceVertsValenceSum());

    result->_E_IT.Resize(tablesFactory.GetNumEdgeVerticesTotal(maxlevel)*2);

    result->_V_ITa.Resize(tablesFactory.GetNumVertexVerticesTotal(maxlevel));

    for (int level=1; level<=maxlevel; ++level) {

        // pointer to the first vertex corresponding to this level
        result->_vertsOffsets[level] = tablesFactory._vertVertIdx[level-1] + 
                                       (int)tablesFactory._vertVertsList[level-1].size();

        typename FarSubdivisionTables<U>::VertexKernelBatch * batch = & (result->_batches[level-1]);

        // Face vertices
        // "For each vertex, gather all the vertices from the parent face."
        int offset = 0;
        int * F_ITa = result->_F_ITa[level-1];
        unsigned int * F_IT = result->_F_IT[level-1];
        batch->kernelF = (int)tablesFactory._faceVertsList[level].size();
        for (int i=0; i < batch->kernelF; ++i) {

            HbrVertex<T> * v = tablesFactory._faceVertsList[level][i];
            assert(v);

            HbrFace<T> * f=v->GetParentFace();
            assert(f);

            int valence = f->GetNumVertices();

            F_ITa[2*i+0] = offset;
            F_ITa[2*i+1] = valence;

            for (int j=0; j<valence; ++j)
                F_IT[offset++] = remap[f->GetVertex(j)->GetID()];
        }
        result->_F_ITa.SetMarker(level, &F_ITa[2*batch->kernelF]);
        result->_F_IT.SetMarker(level, &F_IT[offset]);

        // Edge vertices

        // "Average the end-points of the parent edge"
        int * E_IT = result->_E_IT[level-1];
        batch->kernelE = (int)tablesFactory._edgeVertsList[level].size();
        for (int i=0; i < batch->kernelE; ++i) {

            HbrVertex<T> * v = tablesFactory._edgeVertsList[level][i];
            assert(v);
            HbrHalfedge<T> * e = v->GetParentEdge();
            assert(e);

            // get the indices 2 vertices from the parent edge
            E_IT[2*i+0] = remap[e->GetOrgVertex()->GetID()];
            E_IT[2*i+1] = remap[e->GetDestVertex()->GetID()];

        }
        result->_E_IT.SetMarker(level, &E_IT[2*batch->kernelE]);

        // Vertex vertices

        // "Pass down the parent vertex"
        offset = 0;
        int * V_ITa = result->_V_ITa[level-1];
        batch->kernelB.first = 0;
        batch->kernelB.second = (int)tablesFactory._vertVertsList[level].size();
        for (int i=0; i < batch->kernelB.second; ++i) {

            HbrVertex<T> * v = tablesFactory._vertVertsList[level][i],
                         * pv = v->GetParentVertex();
            assert(v and pv);

            V_ITa[i] = remap[pv->GetID()];

        }
        result->_V_ITa.SetMarker(level, &V_ITa[batch->kernelB.second]);
    }
    return result;
}

} // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

} // end namespace OpenSubdiv

#endif /* FAR_BILINEAR_SUBDIVISION_TABLES_FACTORY_H */