/******************************************************************************
 * Copyright (c) 2024 Advanced Micro Devices, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *****************************************************************************/

using namespace rocshmem;

/* Declare the template with a generic implementation */
template <typename T>
__device__ void wg_broadcast(roc_shmem_ctx_t ctx, T *dest, const T *source,
                             int nelem, int pe_root, int pe_start,
                             int log_pe_stride, int pe_size, long *p_sync) {
  return;
}

/* Define templates to call ROC_SHMEM */
#define BROADCAST_DEF_GEN(T, TNAME)                                           \
  template <>                                                                 \
  __device__ void wg_broadcast<T>(                                            \
      roc_shmem_ctx_t ctx, T * dest, const T *source, int nelem, int pe_root, \
      int pe_start, int log_pe_stride, int pe_size, long *p_sync) {           \
    roc_shmem_ctx_##TNAME##_wg_broadcast(ctx, dest, source, nelem, pe_root,   \
                                         pe_start, log_pe_stride, pe_size,    \
                                         p_sync);                             \
  }

BROADCAST_DEF_GEN(float, float)
BROADCAST_DEF_GEN(double, double)
BROADCAST_DEF_GEN(char, char)
// BROADCAST_DEF_GEN(long double, longdouble)
BROADCAST_DEF_GEN(signed char, schar)
BROADCAST_DEF_GEN(short, short)
BROADCAST_DEF_GEN(int, int)
BROADCAST_DEF_GEN(long, long)
BROADCAST_DEF_GEN(long long, longlong)
BROADCAST_DEF_GEN(unsigned char, uchar)
BROADCAST_DEF_GEN(unsigned short, ushort)
BROADCAST_DEF_GEN(unsigned int, uint)
BROADCAST_DEF_GEN(unsigned long, ulong)
BROADCAST_DEF_GEN(unsigned long long, ulonglong)

/******************************************************************************
 * DEVICE TEST KERNEL
 *****************************************************************************/
template <typename T1>
__global__ void BroadcastTest(int loop, int skip, uint64_t *timer,
                              T1 *source_buf, T1 *dest_buf, long *pSync,
                              int size, ShmemContextType ctx_type) {
  __shared__ roc_shmem_ctx_t ctx;

  roc_shmem_wg_init();
  roc_shmem_wg_ctx_create(ctx_type, &ctx);

  int n_pes = roc_shmem_ctx_n_pes(ctx);

  __syncthreads();

  uint64_t start;
  for (int i = 0; i < loop; i++) {
    if (i == skip && hipThreadIdx_x == 0) {
      start = roc_shmem_timer();
    }

    wg_broadcast<T1>(ctx,
                     dest_buf,    // T* dest
                     source_buf,  // const T* source
                     size,        // int nelement
                     0,           // int PE_root
                     0,           // int PE_start
                     0,           // int logPE_stride
                     n_pes,       // int PE_size
                     pSync);      // long *pSync
    roc_shmem_ctx_wg_barrier_all(ctx);
  }

  __syncthreads();

  if (hipThreadIdx_x == 0) {
    timer[hipBlockIdx_x] = roc_shmem_timer() - start;
  }

  roc_shmem_wg_ctx_destroy(&ctx);
  roc_shmem_wg_finalize();
}

/******************************************************************************
 * HOST TESTER CLASS METHODS
 *****************************************************************************/
template <typename T1>
BroadcastTester<T1>::BroadcastTester(
    TesterArguments args, std::function<void(T1 &, T1 &)> f1,
    std::function<std::pair<bool, std::string>(const T1 &)> f2)
    : Tester(args), init_buf{f1}, verify_buf{f2} {
  source_buf = (T1 *)roc_shmem_malloc(args.max_msg_size * sizeof(T1));
  dest_buf = (T1 *)roc_shmem_malloc(args.max_msg_size * sizeof(T1));

  size_t p_sync_size = ROC_SHMEM_BCAST_SYNC_SIZE;
  pSync = (long *)roc_shmem_malloc(p_sync_size * sizeof(long));

  for (int i = 0; i < p_sync_size; i++) {
    pSync[i] = ROC_SHMEM_SYNC_VALUE;
  }
}

template <typename T1>
BroadcastTester<T1>::~BroadcastTester() {
  roc_shmem_free(source_buf);
  roc_shmem_free(dest_buf);
  roc_shmem_free(pSync);
}

template <typename T1>
void BroadcastTester<T1>::launchKernel(dim3 gridSize, dim3 blockSize, int loop,
                                       uint64_t size) {
  size_t shared_bytes = 0;

  hipLaunchKernelGGL(BroadcastTest<T1>, gridSize, blockSize, shared_bytes,
                     stream, loop, args.skip, timer, source_buf, dest_buf,
                     pSync, size, _shmem_context);

  num_msgs = loop + args.skip;
  num_timed_msgs = loop;
}

template <typename T1>
void BroadcastTester<T1>::resetBuffers(uint64_t size) {
  for (int i = 0; i < args.max_msg_size; i++) {
    init_buf(source_buf[i], dest_buf[i]);
  }
}

template <typename T1>
void BroadcastTester<T1>::verifyResults(uint64_t size) {
  for (int i = 0; i < size; i++) {
    auto r = verify_buf(dest_buf[i]);
    if (r.first == false) {
      fprintf(stderr, "Data validation error at idx %d\n", i);
      fprintf(stderr, "%s.\n", r.second.c_str());
      exit(-1);
    }
  }
}