// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2023 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
//

#include <torch/script.h>

#include <vector>

#include "open3d/ml/impl/sparse_conv/SparseConv.h"

using namespace open3d::ml::impl;

template <class TFeat, class TOut, class TIndex, class TKernelIndex>
void SparseConvCPU(const torch::Tensor& filters,
                   const torch::Tensor& inp_features,
                   const torch::Tensor& inp_importance,
                   const torch::Tensor& neighbors_index,
                   const torch::Tensor& neighbors_kernel_index,
                   const torch::Tensor& neighbors_importance,
                   const torch::Tensor& neighbors_row_splits,
                   const bool normalize,
                   const int64_t max_temp_mem_MB,
                   torch::Tensor& out_features) {
    std::vector<int> filter_dims;
    for (auto d : filters.sizes()) {
        filter_dims.push_back(d);
    }
    SparseConvComputeFeaturesCPU<TFeat, TOut, TIndex, TKernelIndex>(
            out_features.data_ptr<TOut>(), filter_dims,
            filters.data_ptr<TFeat>(), neighbors_row_splits.size(0) - 1,
            inp_features.size(0), inp_features.data_ptr<TFeat>(),
            inp_importance.size(0) ? inp_importance.data_ptr<TFeat>() : nullptr,
            neighbors_index.size(0),
            (TIndex*)neighbors_index.data_ptr<TIndex>(),
            (TKernelIndex*)neighbors_kernel_index.data_ptr<TKernelIndex>(),
            neighbors_importance.size(0)
                    ? neighbors_importance.data_ptr<TFeat>()
                    : nullptr,
            neighbors_row_splits.data_ptr<int64_t>(), normalize);
}
#define INSTANTIATE(TFeat, TOut, TIndex, TKernelIndex)                       \
    template void SparseConvCPU<TFeat, TOut, TIndex, TKernelIndex>(          \
            const torch::Tensor& filters, const torch::Tensor& inp_features, \
            const torch::Tensor& inp_importance,                             \
            const torch::Tensor& neighbors_index,                            \
            const torch::Tensor& neighbors_kernel_index,                     \
            const torch::Tensor& neighbors_importance,                       \
            const torch::Tensor& neighbors_row_splits, const bool normalize, \
            const int64_t max_temp_mem_MB, torch::Tensor& out_features);

INSTANTIATE(float, float, int32_t, uint8_t)