/* Copyright 2019 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ===========================================================================*/

#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif

#include <cmath>
#include <cstddef>

#include "tfjs-backend-wasm/src/cc/backend.h"
#include "tfjs-backend-wasm/src/cc/binary.h"
#include "tfjs-backend-wasm/src/cc/util.h"

namespace tfjs {
namespace wasm {
// We use C-style API to interface with Javascript.
extern "C" {

#ifdef __EMSCRIPTEN__
EMSCRIPTEN_KEEPALIVE
#endif
void FloorDiv(const size_t a_id, const size_t* a_shape_ptr,
              const size_t a_shape_len, const size_t b_id,
              const size_t* b_shape_ptr, const size_t b_shape_len,
              const DType dtype, const size_t out_id) {
  switch (dtype) {
    case DType::float32:
      binary_f32(a_id, a_shape_ptr, a_shape_len, b_id, b_shape_ptr, b_shape_len,
                 out_id, [](float a, float b) {
                   return static_cast<float>(floor(a / b));
                 });
      break;
    case DType::int32:
      binary_i32(
          a_id, a_shape_ptr, a_shape_len, b_id, b_shape_ptr, b_shape_len,
          out_id, [](int a, int b) {
            return static_cast<int32_t>(floor(static_cast<float>(a) / b));
          });
      break;
    default:
      util::warn(
          "FloorDiv for tensor ids %d and %d failed. Unsupported dtype %d",
          a_id, b_id, dtype);
  }
}

}  // extern "C"
}  // namespace wasm
}  // namespace tfjs
