/* ******************************************************************************
 *
 *
 * 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
 ******************************************************************************/

//
// Created by remote on 2018-09-20.
//

#include <ops/ops.h>
#include <loops/pairwise_transform.h>
#include <types/types.h>
#include <helpers/LoopKind.h>
#include <math/templatemath.h>
#include <helpers/shape.h>
#include <system/op_boilerplate.h>
#include <helpers/OmpLaunchHelper.h>
#include <execution/Threads.h>

using namespace simdOps;

namespace functions {
    namespace pairwise_transforms {

        template <typename X, typename Y, typename Z>
        void PairWiseTransform<X, Y, Z>::exec(const int opNum,
                                              const void *x, Nd4jLong xEws,
                                              const void *y, Nd4jLong yEws,
                                              void *z, Nd4jLong zEws,
                                              void *extraParams,
                                              Nd4jLong n,
                                              const uint64_t start,const uint64_t stop) {
            DISPATCH_BY_OPNUM_TTT(exec, PARAMS(x,
                                               xEws,
                                               y,
                                               yEws,
                                               z,
                                               zEws,
                                               extraParams,
                                               n, start, stop), PAIRWISE_TRANSFORM_OPS);
        };



        template <typename X, typename Y, typename Z>
        template <typename OpType>
        void PairWiseTransform<X, Y, Z>::exec(const void *vx, Nd4jLong xEws,
                                              const void *vy, Nd4jLong yEws,
                                              void *vz, Nd4jLong zEws,
                                              void *vextraParams,
                                              const Nd4jLong n,
                                              const uint64_t start,
                                              const uint64_t stop) {

            auto x = reinterpret_cast<const X *>(vx);
            auto y = reinterpret_cast<const Y *>(vy);
            auto z = reinterpret_cast<Z *>(vz);
            auto extraParams = reinterpret_cast<Z *>(vextraParams);

            if (xEws == 1 && yEws == 1 && zEws == 1) {
                PRAGMA_OMP_SIMD
                for (auto i = start; i < stop; i++)
                        z[i] = OpType::op(x[i], y[i], extraParams);
            }
            else {
                PRAGMA_OMP_SIMD
                for (auto i = start; i < stop; i++)
                    z[i*zEws] = OpType::op(x[i*xEws], y[i*yEws], extraParams);
            }
        }

        template <typename X, typename Y, typename Z>
        void PairWiseTransform<X, Y, Z>::exec(const int opNum,
                                              const void *x, const Nd4jLong *xShapeInfo,
                                              const void *y, const Nd4jLong *yShapeInfo,
                                              void *z, const Nd4jLong *zShapeInfo,
                                              void *extraParams,
                                              const uint64_t start, const uint64_t stop) {
            DISPATCH_BY_OPNUM_TTT(exec, PARAMS(x,
                                              xShapeInfo,
                                              y,
                                              yShapeInfo,
                                              z,
                                              zShapeInfo,
                                              extraParams, start, stop),
                                 PAIRWISE_TRANSFORM_OPS);
        };


        template <typename X, typename Y, typename Z>
        template <typename OpType>
        void PairWiseTransform<X, Y, Z>::exec(const void *vx, const Nd4jLong* xShapeInfo,
                                              const void *vy, const Nd4jLong* yShapeInfo,
                                              void *vz, const Nd4jLong* zShapeInfo,
                                              void *vextraParams,
                                              const uint64_t start, const uint64_t stop) {

            auto x = reinterpret_cast<const X *>(vx);
            auto y = reinterpret_cast<const Y *>(vy);
            auto z = reinterpret_cast<Z *>(vz);
            auto extraParams = reinterpret_cast<Z *>(vextraParams);

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


            if (shape::isScalar(yShapeInfo)) {

                uint xShapeInfoCast[MAX_RANK];
                const bool canCastX = sd::DataTypeUtils::castShapeInfo(xShapeInfo, xShapeInfoCast);

                if(shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo)) {
                    PRAGMA_OMP_SIMD
                    for(auto i = start; i < stop; i++)  {
                        auto offset = shape::indexOffset(i, xShapeInfo, xShapeInfoCast, canCastX);
                        z[offset] = OpType::op(x[offset], y[0], extraParams);
                    };
                }
                else {
                    uint zShapeInfoCast[MAX_RANK];
                    const bool canCastZ = sd::DataTypeUtils::castShapeInfo(zShapeInfo, zShapeInfoCast);

                    PRAGMA_OMP_SIMD
                    for(auto i = start; i < stop; i++)  {
                        auto xOffset = shape::indexOffset(i, xShapeInfo, xShapeInfoCast, canCastX);
                        auto zOffset = shape::indexOffset(i, zShapeInfo, zShapeInfoCast, canCastZ);
                        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 ((kindOfLoop == sd::LoopKind::EWS1 || kindOfLoop == sd::LoopKind::EWSNONZERO) && sameShapesXY) {
                exec<OpType>(x, xEws, y, yEws, z, zEws, extraParams, n, start, stop);
            }
            else if ((kindOfLoop == sd::LoopKind::EWS1 || kindOfLoop == sd::LoopKind::EWSNONZERO) && !sameShapesXY) { //not same shape
                exec<OpType>(x, xEws, y, yEws, z, zEws, extraParams, shape::length(yShapeInfo), start, stop);
            }
            else {

                if(shape::haveSameShapeAndStrides(xShapeInfo, yShapeInfo) && shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo)) {
                    uint xShapeInfoCast[MAX_RANK];
                    bool canCastX = sd::DataTypeUtils::castShapeInfo(xShapeInfo, xShapeInfoCast);

                    PRAGMA_OMP_SIMD
                    for (auto i = start; i < stop; i++)  {
                        auto offset = shape::indexOffset(i, xShapeInfo, xShapeInfoCast, canCastX);
                        z[offset] = OpType::op(x[offset], y[offset], extraParams);
                    }
                }
                else if(shape::haveSameShapeAndStrides(xShapeInfo, yShapeInfo)) {
                    uint xShapeInfoCast[MAX_RANK];
                    uint zShapeInfoCast[MAX_RANK];
                    bool canCastX = sd::DataTypeUtils::castShapeInfo(xShapeInfo, xShapeInfoCast);
                    bool canCastZ = sd::DataTypeUtils::castShapeInfo(zShapeInfo, zShapeInfoCast);

                    PRAGMA_OMP_SIMD
                    for (auto i = start; i < stop; i++)  {
                        auto offset  = shape::indexOffset(i, xShapeInfo, xShapeInfoCast, canCastX);
                        auto zOffset = shape::indexOffset(i, zShapeInfo, zShapeInfoCast, canCastZ);
                        z[zOffset] = OpType::op(x[offset], y[offset], extraParams);
                    };
                }
                else if(shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo)) {
                    uint xShapeInfoCast[MAX_RANK];
                    uint yShapeInfoCast[MAX_RANK];
                    bool canCastX = sd::DataTypeUtils::castShapeInfo(xShapeInfo, xShapeInfoCast);
                    bool canCastY = sd::DataTypeUtils::castShapeInfo(yShapeInfo, yShapeInfoCast);

                    PRAGMA_OMP_SIMD
                    for (auto i = start; i < stop; i++)  {
                        auto offset  = shape::indexOffset(i, xShapeInfo, xShapeInfoCast, canCastX);
                        auto yOffset = shape::indexOffset(i, yShapeInfo, yShapeInfoCast, canCastY);
                        z[offset] = OpType::op(x[offset], y[yOffset], extraParams);
                    };
                }
                else if(shape::haveSameShapeAndStrides(yShapeInfo, zShapeInfo)) {
                    uint xShapeInfoCast[MAX_RANK];
                    uint yShapeInfoCast[MAX_RANK];
                    bool canCastX = sd::DataTypeUtils::castShapeInfo(xShapeInfo, xShapeInfoCast);
                    bool canCastY = sd::DataTypeUtils::castShapeInfo(yShapeInfo, yShapeInfoCast);

                    PRAGMA_OMP_SIMD
                    for (auto i = start; i < stop; i++)  {
                        auto xOffset = shape::indexOffset(i, xShapeInfo, xShapeInfoCast, canCastX);
                        auto offset  = shape::indexOffset(i, yShapeInfo, yShapeInfoCast, canCastY);
                        z[offset] = OpType::op(x[xOffset], y[offset], extraParams);
                    };
                }
                else {
                    uint xShapeInfoCast[MAX_RANK];
                    uint yShapeInfoCast[MAX_RANK];
                    uint zShapeInfoCast[MAX_RANK];
                    bool canCastX = sd::DataTypeUtils::castShapeInfo(xShapeInfo, xShapeInfoCast);
                    bool canCastY = sd::DataTypeUtils::castShapeInfo(yShapeInfo, yShapeInfoCast);
                    bool canCastZ = sd::DataTypeUtils::castShapeInfo(zShapeInfo, zShapeInfoCast);

                    PRAGMA_OMP_SIMD
                    for (auto i = start; i < stop; i++)  {
                        auto xOffset = shape::indexOffset(i, xShapeInfo, xShapeInfoCast, canCastX);
                        auto yOffset = shape::indexOffset(i, yShapeInfo, yShapeInfoCast, canCastY);
                        auto zOffset = shape::indexOffset(i, zShapeInfo, zShapeInfoCast, canCastZ);
                        z[zOffset] = OpType::op(x[xOffset], y[yOffset], extraParams);
                    };
                }
            }
        }
    }
}
