/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.

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. */

#include "PaddleCAPI.h"
#include "PaddleCAPIPrivate.h"
#include "hl_cuda.h"

#define cast(v) paddle::capi::cast<paddle::capi::CMatrix>(v)
extern "C" {
int PDMatCreate(PD_Matrix* mat, uint64_t height, uint64_t width, bool useGpu) {
  auto ptr = new paddle::capi::CMatrix();
  ptr->mat = paddle::Matrix::create(height, width, false, useGpu);
  *mat = ptr;
  return kPD_NO_ERROR;
}

int PDMatCreateNone(PD_Matrix* mat) {
  auto ptr = new paddle::capi::CMatrix();
  *mat = ptr;
  return kPD_NO_ERROR;
}

int PDMatDestroy(PD_Matrix mat) {
  if (mat == nullptr) return kPD_NULLPTR;
  auto ptr = cast(mat);
  delete ptr;
  return kPD_NO_ERROR;
}

int PDMatCopyToRow(PD_Matrix mat, uint64_t rowID, pd_real* rowArray) {
  if (mat == nullptr) return kPD_NULLPTR;
  auto ptr = cast(mat);
  if (ptr->mat == nullptr) return kPD_NULLPTR;
  if (rowID >= ptr->mat->getHeight()) return kPD_OUT_OF_RANGE;
  paddle::real* buf = ptr->mat->getRowBuf(rowID);
  size_t width = ptr->mat->getWidth();
#ifndef PADDLE_ONLY_CPU
  hl_memcpy(buf, rowArray, sizeof(paddle::real) * width);
#else
  std::copy(rowArray, rowArray + width, buf);
#endif
  return kPD_NO_ERROR;
}

int PDMatGetRow(PD_Matrix mat, uint64_t rowID, pd_real** rawRowBuffer) {
  if (mat == nullptr) return kPD_NULLPTR;
  auto ptr = cast(mat);
  if (ptr->mat == nullptr) return kPD_NULLPTR;
  if (rowID >= ptr->mat->getHeight()) return kPD_OUT_OF_RANGE;
  *rawRowBuffer = ptr->mat->getRowBuf(rowID);
  return kPD_NO_ERROR;
}

int PDMatGetShape(PD_Matrix mat, uint64_t* height, uint64_t* width) {
  if (mat == nullptr) return kPD_NULLPTR;
  if (height != nullptr) {
    *height = cast(mat)->mat->getHeight();
  }
  if (width != nullptr) {
    *width = cast(mat)->mat->getWidth();
  }
  return kPD_NO_ERROR;
}
}