// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright Contributors to the Kokkos project
#include <cstdio>

#include <ctime>
#include <cstring>
#include <cstdlib>
#include <limits>
#include <limits.h>
#include <cmath>

#include <Kokkos_Core.hpp>
#include "Kokkos_MV.hpp"
#ifndef DEVICE
#define DEVICE 1
#endif
#if DEVICE == 1
typedef Kokkos::Threads execution_space;
#else
typedef Kokkos::Cuda execution_space;
#endif

typedef double FLOAT;

#define EPSILON 1e-10

typedef MultiVectorDynamic<FLOAT, execution_space>::type mv_type;
typedef mv_type::host_mirror_type h_mv_type;
typedef Kokkos::View<FLOAT*, Kokkos::LayoutLeft, execution_space> vector_type;
typedef Kokkos::View<FLOAT*, Kokkos::LayoutLeft, Kokkos::Threads> h2_vector_type;
typedef vector_type::host_mirror_type h_vector_type;
typedef mv_type::size_type size_type;

void test_mv_dot(int size, int numVecs, int loop) {
  mv_type x("X", size, numVecs);
  mv_type y("Y", size, numVecs);
  mv_type r("R", size, numVecs);
  vector_type a("A", numVecs);
  h_mv_type h_x     = Kokkos::create_mirror_view(x);
  h_mv_type h_y     = Kokkos::create_mirror_view(y);
  h_mv_type h_rh    = Kokkos::create_mirror_view(r);
  h_mv_type h_rd    = Kokkos::create_mirror_view(r);
  h_vector_type h_a = Kokkos::create_mirror_view(a);
  h2_vector_type h_a2("h2", numVecs);

  srand(17231);
  for (int k = 0; k < numVecs; k++) {
    h_a2(k) = 0;  //(1.0*(1.0*rand()/std::numeric_limits<unsigned int>::max())-0.5)*1;
    h_a(k)  = 0;
    for (int i = 0; i < size; i++) {
      h_x(i, k) = (1.0 * (1.0 * rand() / std::numeric_limits<unsigned int>::max()) - 0.5) * 1;
      h_y(i, k) = (1.0 * (1.0 * rand() / std::numeric_limits<unsigned int>::max()) - 0.5) * 1;
      h_a2(k) += h_y(i, k) * h_x(i, k);
    }
  }

  Kokkos::deep_copy(x, h_x);
  Kokkos::deep_copy(y, h_y);
  Kokkos::deep_copy(a, h_a);
  h_vector_type h_b = h_a;

  MV_Dot(a, x, y);
  execution_space().fence();

  Kokkos::deep_copy(h_a, a);
  double errorsum = 0;
  int errors      = 0;
  for (int k = 0; k < numVecs; k++) {
    errorsum += fabs((h_a(k) - h_a2(k)) / h_a2(k));
    if (fabs((h_a(k) - h_a2(k)) / h_a2(k)) > EPSILON) errors++;
  }

  timespec starttime, endtime;
  clock_gettime(CLOCK_REALTIME, &starttime);
  for (int i = 0; i < loop; i++) MV_Dot(a, x, y);
  execution_space().fence();
  clock_gettime(CLOCK_REALTIME, &endtime);
  double time = endtime.tv_sec - starttime.tv_sec + 1.0 * (endtime.tv_nsec - starttime.tv_nsec) / 1000000000;

  printf("MV_Dot:       %6.2lf GB/s %8i Elements %3i Vectors %s\n",
         2 * size * numVecs * sizeof(FLOAT) * loop / time * 1e-9, size, numVecs, errors == 0 ? "PASSED" : "FAILED");
}

void test_mv_add(int size, int numVecs, int loop) {
  mv_type x("X", size, numVecs);
  mv_type y("Y", size, numVecs);
  mv_type r("R", size, numVecs);
  vector_type a("A", numVecs);
  h_mv_type h_x     = Kokkos::create_mirror_view(x);
  h_mv_type h_y     = Kokkos::create_mirror_view(y);
  h_mv_type h_rh    = Kokkos::create_mirror_view(r);
  h_mv_type h_rd    = Kokkos::create_mirror_view(r);
  h_vector_type h_a = Kokkos::create_mirror_view(a);
  h_vector_type h_b("h_b", numVecs);

  srand(17231);
  for (int k = 0; k < numVecs; k++) {
    h_a(k) = (1.0 * (1.0 * rand() / std::numeric_limits<unsigned int>::max()) - 0.5) * 1;
    for (int i = 0; i < size; i++) {
      h_x(i, k)  = (1.0 * (1.0 * rand() / std::numeric_limits<unsigned int>::max()) - 0.5) * 1;
      h_y(i, k)  = (1.0 * (1.0 * rand() / std::numeric_limits<unsigned int>::max()) - 0.5) * 1;
      h_rh(i, k) = h_a(k) * h_y(i, k) + h_a(k) * h_x(i, k);
    }
  }

  Kokkos::deep_copy(x, h_x);
  Kokkos::deep_copy(y, h_y);
  Kokkos::deep_copy(a, h_a);
  MV_Add(r, a, x, a, y);
  execution_space().fence();

  Kokkos::deep_copy(h_rd, r);
  for (int k = 0; k < numVecs; k++) {
    h_a(k) = 0;
    h_b(k) = 0;
    for (int i = 0; i < size; i++) {
      h_a(k) += (h_rh(i, k) - h_rd(i, k)) * (h_rh(i, k) - h_rd(i, k));
      h_b(k) += h_rh(i, k) * h_rh(i, k);
    }
  }

  double errorsum = 0;
  int errors      = 0;
  for (int k = 0; k < numVecs; k++) {
    errorsum += fabs((h_a(k)) / h_b(k));
    if (fabs((h_a(k)) / h_b(k)) > EPSILON) errors++;
  }

  timespec starttime, endtime;
  clock_gettime(CLOCK_REALTIME, &starttime);
  for (int i = 0; i < loop; i++) MV_Add(r, a, x, a, y);
  execution_space().fence();
  clock_gettime(CLOCK_REALTIME, &endtime);
  double time = endtime.tv_sec - starttime.tv_sec + 1.0 * (endtime.tv_nsec - starttime.tv_nsec) / 1000000000;

  printf("MV_Add:       %6.2lf GB/s %8i Elements %3i Vectors %s\n",
         3 * size * numVecs * sizeof(FLOAT) * loop / time * 1e-9, size, numVecs, errors == 0 ? "PASSED" : "FAILED");
}

void test_mv_mulscalar(int size, int numVecs, int loop) {
  mv_type x("X", size, numVecs);
  mv_type r("R", size, numVecs);
  vector_type a("A", numVecs);
  h_mv_type h_x     = Kokkos::create_mirror_view(x);
  h_mv_type h_rh    = Kokkos::create_mirror_view(r);
  h_mv_type h_rd    = Kokkos::create_mirror_view(r);
  h_vector_type h_a = Kokkos::create_mirror_view(a);
  h_vector_type h_b("h_b", numVecs);

  srand(17231);
  for (int k = 0; k < numVecs; k++) {
    h_a(k) = (1.0 * (1.0 * rand() / std::numeric_limits<unsigned int>::max()) - 0.5) * 1;
    for (int i = 0; i < size; i++) {
      h_x(i, k)  = (1.0 * (1.0 * rand() / std::numeric_limits<unsigned int>::max()) - 0.5) * 1;
      h_rh(i, k) = h_a(k) * h_x(i, k);
    }
  }

  Kokkos::deep_copy(x, h_x);
  Kokkos::deep_copy(a, h_a);
  MV_MulScalar(r, a, x);
  execution_space().fence();

  Kokkos::deep_copy(h_rd, r);
  for (int k = 0; k < numVecs; k++) {
    h_a(k) = 0;
    h_b(k) = 0;
    for (int i = 0; i < size; i++) {
      h_a(k) += (h_rh(i, k) - h_rd(i, k)) * (h_rh(i, k) - h_rd(i, k));
      h_b(k) += h_rh(i, k) * h_rh(i, k);
    }
  }

  double errorsum = 0;
  int errors      = 0;
  for (int k = 0; k < numVecs; k++) {
    errorsum += fabs((h_a(k)) / h_b(k));
    if (fabs((h_a(k)) / h_b(k)) > EPSILON) errors++;
  }

  timespec starttime, endtime;
  clock_gettime(CLOCK_REALTIME, &starttime);
  for (int i = 0; i < loop; i++) MV_MulScalar(r, a, x);
  execution_space().fence();
  clock_gettime(CLOCK_REALTIME, &endtime);
  double time = endtime.tv_sec - starttime.tv_sec + 1.0 * (endtime.tv_nsec - starttime.tv_nsec) / 1000000000;

  printf("MV_MulScalar: %6.2lf GB/s %8i Elements %3i Vectors %s\n",
         2 * size * numVecs * sizeof(FLOAT) * loop / time * 1e-9, size, numVecs, errors == 0 ? "PASSED" : "FAILED");
}

int main(int argc, char** argv) {
  int size             = 200000;
  int numVecs          = 17;
  int loop             = 100;
  int threads_per_numa = 1;
  int device           = 0;
  int numa             = 1;

  for (int i = 0; i < argc; i++) {
    if ((strcmp(argv[i], "-n") == 0)) {
      loop = atoi(argv[++i]);
      continue;
    }
    if ((strcmp(argv[i], "-d") == 0)) {
      device = atoi(argv[++i]);
      continue;
    }
    if ((strcmp(argv[i], "-s") == 0)) {
      size = atoi(argv[++i]);
      continue;
    }
    if ((strcmp(argv[i], "-v") == 0)) {
      numVecs = atoi(argv[++i]);
      continue;
    }
    if ((strcmp(argv[i], "--threads") == 0)) {
      threads_per_numa = atoi(argv[++i]);
      continue;
    }
    if ((strcmp(argv[i], "--numa") == 0)) {
      numa = atoi(argv[++i]);
      continue;
    }
  }

  Kokkos::InitArguments args_init;

  args_init.device_id = device;

  if (numa > 1 || threads > 1) {
    args_init.num_threads = numa * threads_per_numa;
    args_init.num_numa    = numa;
  }

  Kokkos::initialize(args_init);
  {
    test_mv_dot(size, numVecs, loop);
    test_mv_add(size, numVecs, loop);
    test_mv_mulscalar(size, numVecs, loop);
  }
  Kokkos::finalize();
}
