// Copyright (c) 2017-2022, Lawrence Livermore National Security, LLC and other CEED contributors.
// All Rights Reserved. See the top-level LICENSE and NOTICE files for details.
//
// SPDX-License-Identifier: BSD-2-Clause
//
// This file is part of CEED:  http://github.com/ceed

#include "../../kernel-defines.hpp"

const char *occa_tensor_basis_1d_cpu_function_source = STRINGIFY_SOURCE(

    @directive("#define TENSOR_FUNCTION(FUNCTION_NAME) tensor_1d_ ## FUNCTION_NAME ## _Q ## Q1D ## _P ## P1D")

        inline void TENSOR_FUNCTION(interpElement)(const CeedScalar *B @dim(P1D, Q1D), const CeedScalar *Ue, CeedScalar *Ve) {
          for (int q = 0; q < Q1D; ++q) {
            CeedScalar Vq = 0;
            for (int p = 0; p < P1D; ++p) {
              Vq += B(p, q) * Ue[p];
            }
            Ve[q] = Vq;
          }
        }

    inline void TENSOR_FUNCTION(interpElementTranspose)(const CeedScalar *B @dim(P1D, Q1D), const CeedScalar *Ue, CeedScalar *Ve) {
      for (int p = 0; p < P1D; ++p) {
        CeedScalar Vp = 0;
        for (int q = 0; q < Q1D; ++q) {
          Vp += B(p, q) * Ue[q];
        }
        Ve[p] = Vp;
      }
    }

    inline void TENSOR_FUNCTION(gradElement)(const CeedScalar *B @dim(P1D, Q1D), const CeedScalar *Bx @dim(P1D, Q1D), const CeedScalar *Ue,
                                             CeedScalar *Ve) {
      for (int q = 0; q < Q1D; ++q) {
        CeedScalar Vq = 0;
        for (int p = 0; p < P1D; ++p) {
          Vq += Bx(p, q) * Ue[p];
        }
        Ve[q] = Vq;
      }
    }

    inline void TENSOR_FUNCTION(gradElementTranspose)(const CeedScalar *B @dim(P1D, Q1D), const CeedScalar *Bx @dim(P1D, Q1D), const CeedScalar *Ue,
                                                      CeedScalar *Ve) {
      for (int p = 0; p < P1D; ++p) {
        CeedScalar Vp = 0;
        for (int q = 0; q < Q1D; ++q) {
          Vp += Bx(p, q) * Ue[q];
        }
        Ve[p] = Vp;
      }
    }

    inline void TENSOR_FUNCTION(weightElement)(const CeedScalar *qWeights1D, CeedScalar *We) {
      for (int q = 0; q < Q1D; ++q) {
        We[q] = qWeights1D[q];
      }
    }

);

const char *occa_tensor_basis_1d_cpu_kernel_source = STRINGIFY_SOURCE(

    @kernel void interp(const CeedInt elementCount, const CeedScalar *B, const CeedScalar *U, CeedScalar *V) {
      for (int element = 0; element < elementCount; ++element; @outer) {
        for (int component = 0; component < BASIS_COMPONENT_COUNT; ++component; @inner) {
          if (!TRANSPOSE) {
            const CeedScalar *Ue @dim(P1D, BASIS_COMPONENT_COUNT, elementCount) = U;
            CeedScalar       *Ve @dim(Q1D, elementCount, BASIS_COMPONENT_COUNT) = V;

            TENSOR_FUNCTION(interpElement)(B, &Ue(0, component, element), &Ve(0, element, component));
          } else {
            const CeedScalar *Ue @dim(Q1D, elementCount, BASIS_COMPONENT_COUNT) = U;
            CeedScalar       *Ve @dim(P1D, BASIS_COMPONENT_COUNT, elementCount) = V;

            TENSOR_FUNCTION(interpElementTranspose)(B, &Ue(0, element, component), &Ve(0, component, element));
          }
        }
      }
    }

    @kernel void grad(const CeedInt elementCount, const CeedScalar *B, const CeedScalar *Bx, const CeedScalar *U, CeedScalar *V) {
      for (int element = 0; element < elementCount; ++element; @outer) {
        for (int component = 0; component < BASIS_COMPONENT_COUNT; ++component; @inner) {
          if (!TRANSPOSE) {
            const CeedScalar *Ue @dim(P1D, BASIS_COMPONENT_COUNT, elementCount) = U;
            CeedScalar       *Ve @dim(Q1D, elementCount, BASIS_COMPONENT_COUNT) = V;

            TENSOR_FUNCTION(gradElement)(B, Bx, &Ue(0, component, element), &Ve(0, element, component));
          } else {
            const CeedScalar *Ue @dim(Q1D, elementCount, BASIS_COMPONENT_COUNT) = U;
            CeedScalar       *Ve @dim(P1D, BASIS_COMPONENT_COUNT, elementCount) = V;

            TENSOR_FUNCTION(gradElementTranspose)(B, Bx, &Ue(0, element, component), &Ve(0, component, element));
          }
        }
      }
    }

    @kernel void weight(const CeedInt elementCount, const CeedScalar *qWeights1D, CeedScalar *W @dim(Q1D, elementCount)) {
      @tile(32, @outer, @inner) for (int element = 0; element < elementCount; ++element) {
        TENSOR_FUNCTION(weightElement)(qWeights1D, &W(0, element));
      }
    }

);