/* ******************************************************************************
*
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
*  See the NOTICE file distributed with this work for additional
*  information regarding copyright ownership.
* 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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/

//
// @author raver119@gmail.com
//
#include <execution/Threads.h>
#include <helpers/LoopKind.h>
#include <helpers/OmpLaunchHelper.h>
#include <loops/pairwise_int.h>
#include <types/types.h>

using namespace simdOps;

namespace functions {
namespace pairwise_transforms {



template <typename X>
void PairWiseIntTransform<X>::exec(const int opNum, const void *x, const sd::LongType *xShapeInfo, const void *y,
                                   const sd::LongType *yShapeInfo, void *z, const sd::LongType *zShapeInfo,
                                   void *extraParams, const uint64_t start, const uint64_t stop) {
  DISPATCH_BY_OPNUM_T(exec, PARAMS(x, xShapeInfo, y, yShapeInfo, z, zShapeInfo, extraParams, start, stop),
                      PAIRWISE_INT_OPS);
};

template <typename X>
template <typename OpType>
void PairWiseIntTransform<X>::exec(const void *vx, const sd::LongType *xShapeInfo, const void *vy,
                                   const sd::LongType *yShapeInfo, void *vz, const sd::LongType *zShapeInfo,
                                   void *vextraParams, const uint64_t start, const uint64_t stop) {
  auto x = reinterpret_cast<const X *>(vx);
  auto y = reinterpret_cast<const X *>(vy);
  auto z = reinterpret_cast<X *>(vz);
  auto extraParams = reinterpret_cast<X *>(vextraParams);

  // Cache shape-related values
  sd::LongType xRank = shape::rank(xShapeInfo);
  sd::LongType yRank = shape::rank(yShapeInfo);
  sd::LongType zRank = shape::rank(zShapeInfo);
  sd::LongType *xShape = shape::shapeOf(xShapeInfo);
  sd::LongType *yShape = shape::shapeOf(yShapeInfo);
  sd::LongType *zShape = shape::shapeOf(zShapeInfo);
  sd::LongType *xStride = shape::stride(xShapeInfo);
  sd::LongType *yStride = shape::stride(yShapeInfo);
  sd::LongType *zStride = shape::stride(zShapeInfo);

  auto n = shape::length(xShapeInfo);
  auto xEws = shape::elementWiseStride(xShapeInfo);
  auto yEws = shape::elementWiseStride(yShapeInfo);
  auto zEws = shape::elementWiseStride(zShapeInfo);

  if (shape::isScalar(yShapeInfo)) {
    if (shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo)) {
      PRAGMA_OMP_SIMD
      for (auto i = start; i < stop; i++) {
        sd::LongType coords[SD_MAX_RANK];
        INDEX2COORDS(i, xRank, xShape, coords);
        sd::LongType offset;
        COORDS2INDEX(xRank, xStride, coords, offset);
        z[offset] = OpType::op(x[offset], y[0], extraParams);
      };
    } else {
      PRAGMA_OMP_SIMD
      for (auto i = start; i < stop; i++) {
        sd::LongType coords[SD_MAX_RANK];
        INDEX2COORDS(i, xRank, xShape, coords);
        sd::LongType xOffset, zOffset;
        COORDS2INDEX(xRank, xStride, coords, xOffset);
        COORDS2INDEX(zRank, zStride, coords, zOffset);
        z[zOffset] = OpType::op(x[xOffset], y[0], extraParams);
      };
    }
    return;
  }

  const sd::LoopKind::Kind kindOfLoop = sd::LoopKind::deduceKindOfLoopXYZ(xShapeInfo, yShapeInfo, zShapeInfo);
  const bool sameShapesXY = shape::shapeEquals(xShapeInfo, yShapeInfo);

    if (shape::haveSameShapeAndStrides(xShapeInfo, yShapeInfo) &&
        shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo)) {
      PRAGMA_OMP_SIMD
      for (auto i = start; i < stop; i++) {
        sd::LongType coords[SD_MAX_RANK];
        INDEX2COORDS(i, xRank, xShape, coords);
        sd::LongType offset;
        COORDS2INDEX(xRank, xStride, coords, offset);
        z[offset] = OpType::op(x[offset], y[offset], extraParams);
      }
    } else if (shape::haveSameShapeAndStrides(xShapeInfo, yShapeInfo)) {
      PRAGMA_OMP_SIMD
      for (auto i = start; i < stop; i++) {
        sd::LongType coords[SD_MAX_RANK];
        INDEX2COORDS(i, xRank, xShape, coords);
        sd::LongType offset, zOffset;
        COORDS2INDEX(xRank, xStride, coords, offset);
        COORDS2INDEX(zRank, zStride, coords, zOffset);
        z[zOffset] = OpType::op(x[offset], y[offset], extraParams);
      }
    } else if (shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo)) {
      PRAGMA_OMP_SIMD
      for (auto i = start; i < stop; i++) {
        sd::LongType coords[SD_MAX_RANK];
        INDEX2COORDS(i, xRank, xShape, coords);
        sd::LongType offset, yOffset;
        COORDS2INDEX(xRank, xStride, coords, offset);
        COORDS2INDEX(yRank, yStride, coords, yOffset);
        z[offset] = OpType::op(x[offset], y[yOffset], extraParams);
      }
    } else if (shape::haveSameShapeAndStrides(yShapeInfo, zShapeInfo)) {
      PRAGMA_OMP_SIMD
      for (auto i = start; i < stop; i++) {
        sd::LongType coords[SD_MAX_RANK];
        INDEX2COORDS(i, yRank, yShape, coords);
        sd::LongType xOffset, offset;
        COORDS2INDEX(xRank, xStride, coords, xOffset);
        COORDS2INDEX(yRank, yStride, coords, offset);
        z[offset] = OpType::op(x[xOffset], y[offset], extraParams);
      }
    } else {
      PRAGMA_OMP_SIMD
      for (auto i = start; i < stop; i++) {
        sd::LongType coords[SD_MAX_RANK];
        INDEX2COORDS(i, zRank, zShape, coords);
        sd::LongType xOffset, yOffset, zOffset;
        COORDS2INDEX(xRank, xStride, coords, xOffset);
        COORDS2INDEX(yRank, yStride, coords, yOffset);
        COORDS2INDEX(zRank, zStride, coords, zOffset);
        z[zOffset] = OpType::op(x[xOffset], y[yOffset], extraParams);
      }
    }

}

BUILD_SINGLE_TEMPLATE( class PairWiseIntTransform, , SD_COMMON_TYPES);
}  // namespace pairwise_transforms
}  // namespace functions