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//
// Copyright (c) 2012-2015 DreamWorks Animation LLC
//
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// Mozilla Public License 2.0 ( http://www.mozilla.org/MPL/2.0/ )
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#ifndef OPENVDB_UNITTEST_UTIL_HAS_BEEN_INCLUDED
#define OPENVDB_UNITTEST_UTIL_HAS_BEEN_INCLUDED

#include <openvdb/openvdb.h>
#include <openvdb/tools/Prune.h>// for pruneLevelSet
#include <sstream>

namespace unittest_util {

enum SphereMode { SPHERE_DENSE, SPHERE_DENSE_NARROW_BAND, SPHERE_SPARSE_NARROW_BAND };

/// @brief Generates the signed distance to a sphere located at @a center
/// and with a specified @a radius (both in world coordinates). Only voxels
/// in the domain [0,0,0] -> @a dim are considered. Also note that the
/// level set is either dense, dense narrow-band or sparse narrow-band.
///
/// @note This method is VERY SLOW and should only be used for debugging purposes!
/// However it works for any transform and even with open level sets.
/// A faster approch for closed narrow band generation is to only set voxels
/// sparsely and then use grid::signedFloodFill to defined the sign
/// of the background values and tiles! This is implemented in openvdb/tools/LevelSetSphere.h
template<class GridType>
inline void
makeSphere(const openvdb::Coord& dim, const openvdb::Vec3f& center, float radius,
           GridType& grid, SphereMode mode)
{
    typedef typename GridType::ValueType ValueT;
    const ValueT
        zero = openvdb::zeroVal<ValueT>(),
        outside = grid.background(),
        inside = -outside;

    typename GridType::Accessor acc = grid.getAccessor();
    openvdb::Coord xyz;
    for (xyz[0]=0; xyz[0]<dim[0]; ++xyz[0]) {
        for (xyz[1]=0; xyz[1]<dim[1]; ++xyz[1]) {
            for (xyz[2]=0; xyz[2]<dim[2]; ++xyz[2]) {
                const openvdb::Vec3R p =  grid.transform().indexToWorld(xyz);
                const float dist = float((p-center).length() - radius);
                ValueT val = ValueT(zero + dist);
                switch (mode) {
                case SPHERE_DENSE:
                    acc.setValue(xyz, val);
                    break;
                case SPHERE_DENSE_NARROW_BAND:
                    acc.setValue(xyz, val < inside ? inside : outside < val ? outside : val);
                    break;
                case SPHERE_SPARSE_NARROW_BAND:
                    if (val < inside)
                        acc.setValueOff(xyz, inside);
                    else if (outside < val)
                        acc.setValueOff(xyz, outside);
                    else
                        acc.setValue(xyz, val);
                }
            }
        }
    }
    //if (mode == SPHERE_SPARSE_NARROW_BAND) grid.tree().prune();
    if (mode == SPHERE_SPARSE_NARROW_BAND) openvdb::tools::pruneLevelSet(grid.tree());
}

// Template specialization for boolean trees (mostly a dummy implementation)
template<>
inline void
makeSphere<openvdb::BoolGrid>(const openvdb::Coord& dim, const openvdb::Vec3f& center,
                              float radius, openvdb::BoolGrid& grid, SphereMode)
{
    openvdb::BoolGrid::Accessor acc = grid.getAccessor();
    openvdb::Coord xyz;
    for (xyz[0]=0; xyz[0]<dim[0]; ++xyz[0]) {
        for (xyz[1]=0; xyz[1]<dim[1]; ++xyz[1]) {
            for (xyz[2]=0; xyz[2]<dim[2]; ++xyz[2]) {
                const openvdb::Vec3R p =  grid.transform().indexToWorld(xyz);
                const float dist = static_cast<float>((p-center).length() - radius);
                if (dist <= 0) acc.setValue(xyz, true);
            }
        }
    }
}

// This method will soon be replaced by the one above!!!!!
template<class GridType>
inline void
makeSphere(const openvdb::Coord& dim, const openvdb::Vec3f& center, float radius,
           GridType &grid, float dx, SphereMode mode)
{
    grid.setTransform(openvdb::math::Transform::createLinearTransform(/*voxel size=*/dx));
    makeSphere<GridType>(dim, center, radius, grid, mode);
}

// @todo makePlane

} // namespace unittest_util

#endif // OPENVDB_UNITTEST_UTIL_HAS_BEEN_INCLUDED

// Copyright (c) 2012-2015 DreamWorks Animation LLC
// All rights reserved. This software is distributed under the
// Mozilla Public License 2.0 ( http://www.mozilla.org/MPL/2.0/ )
