#include <functional>

#include <libslic3r/OpenVDBUtils.hpp>
#include <libslic3r/TriangleMesh.hpp>
#include <libslic3r/SLA/Hollowing.hpp>
#include <libslic3r/SLA/Contour3D.hpp>

#include <boost/log/trivial.hpp>

#include <libslic3r/MTUtils.hpp>
#include <libslic3r/I18N.hpp>

//! macro used to mark string used at localization,
//! return same string
#define L(s) Slic3r::I18N::translate(s)

namespace Slic3r {
namespace sla {

template<class S, class = FloatingOnly<S>>
inline void _scale(S s, TriangleMesh &m) { m.scale(float(s)); }

template<class S, class = FloatingOnly<S>>
inline void _scale(S s, Contour3D &m)
{
    for (auto &p : m.points) p *= s;
}

template<class Mesh>
remove_cvref_t<Mesh> _grid_to_mesh(const openvdb::FloatGrid &grid,
                                   double                    isosurf,
                                   double                    adapt);

template<>
TriangleMesh _grid_to_mesh<TriangleMesh>(const openvdb::FloatGrid &grid,
                                   double                    isosurf,
                                   double                    adapt)
{
    return grid_to_mesh(grid, isosurf, adapt);
}

template<>
Contour3D _grid_to_mesh<Contour3D>(const openvdb::FloatGrid &grid,
                                   double                    isosurf,
                                   double                    adapt)
{
    return grid_to_contour3d(grid, isosurf, adapt);
}

template<class Mesh>
remove_cvref_t<Mesh> _generate_interior(Mesh &&mesh,
                                        const JobController &ctl,
                                        double min_thickness,
                                        double voxel_scale,
                                        double closing_dist)
{
    using MMesh = remove_cvref_t<Mesh>;
    MMesh imesh{std::forward<Mesh>(mesh)};
    
    _scale(voxel_scale, imesh);
    
    double offset = voxel_scale * min_thickness;
    double D = voxel_scale * closing_dist;
    float  out_range = 0.1f * float(offset);
    float  in_range = 1.1f * float(offset + D);
    
    if (ctl.stopcondition()) return {};
    else ctl.statuscb(0, L("Hollowing"));
    
    auto gridptr = mesh_to_grid(imesh, {}, out_range, in_range);
    
    assert(gridptr);
    
    if (!gridptr) {
        BOOST_LOG_TRIVIAL(error) << "Returned OpenVDB grid is NULL";
        return MMesh{};
    }
    
    if (ctl.stopcondition()) return {};
    else ctl.statuscb(30, L("Hollowing"));
    
    if (closing_dist > .0) {
        gridptr = redistance_grid(*gridptr, -(offset + D), double(in_range));
    } else {
        D = -offset;
    }
    
    if (ctl.stopcondition()) return {};
    else ctl.statuscb(70, L("Hollowing"));
    
    double iso_surface = D;
    double adaptivity = 0.;
    auto omesh = _grid_to_mesh<MMesh>(*gridptr, iso_surface, adaptivity);
    
    _scale(1. / voxel_scale, omesh);
    
    if (ctl.stopcondition()) return {};
    else ctl.statuscb(100, L("Hollowing"));
    
    return omesh;
}

std::unique_ptr<TriangleMesh> generate_interior(const TriangleMesh &   mesh,
                                                const HollowingConfig &hc,
                                                const JobController &  ctl)
{
    static const double MAX_OVERSAMPL = 7.;
        
    // I can't figure out how to increase the grid resolution through openvdb
    // API so the model will be scaled up before conversion and the result
    // scaled down. Voxels have a unit size. If I set voxelSize smaller, it
    // scales the whole geometry down, and doesn't increase the number of
    // voxels.
    //
    // max 8x upscale, min is native voxel size
    auto voxel_scale = (1.0 + MAX_OVERSAMPL * hc.quality);
    return std::make_unique<TriangleMesh>(
        _generate_interior(mesh, ctl, hc.min_thickness, voxel_scale,
                           hc.closing_distance));
}

bool DrainHole::operator==(const DrainHole &sp) const
{
    return (m_pos == sp.m_pos) && (m_normal == sp.m_normal) &&
            is_approx(m_radius, sp.m_radius) &&
            is_approx(m_height, sp.m_height);
}

}} // namespace Slic3r::sla