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*/

#include <hip_test_common.hh>
#include <hip_test_checkers.hh>
#include <hip/hip_cooperative_groups.h>

#include <array>

struct cluster_output {
  dim3 block_index;
  unsigned int block_rank;
  dim3 thread_index;
  unsigned int thread_rank;
  dim3 dim_blocks;
  unsigned int num_blocks;
  dim3 dim_threads;
  unsigned int num_threads;
};

static __global__ void CLUSTER_DIMS(2, 1, 1) cluster_class_validation(cluster_output* out) {
  namespace cg = cooperative_groups;
  cg::cluster_group c = cg::this_cluster();
  size_t i = blockIdx.x * blockDim.x + threadIdx.x;
  auto tok = c.barrier_arrive();
  out[i].block_index = c.block_index();
  out[i].block_rank = c.block_rank();
  out[i].thread_index = c.thread_index();
  out[i].thread_rank = c.thread_rank();
  out[i].dim_blocks = c.dim_blocks();
  out[i].num_blocks = c.num_blocks();
  out[i].dim_threads = c.dim_threads();
  out[i].num_threads = c.num_threads();
  c.barrier_wait(std::move(tok));
}

HIP_TEST_CASE(Unit_cluster_coop_group_class) {
  constexpr unsigned int grds = 2, blks = 8, total_threads = grds * blks;
  dim3 grid(grds, 1, 1);
  dim3 block(blks, 1, 1);

  std::array<cluster_output, total_threads> out;

  cluster_output* d_out;
  HIP_CHECK(hipMalloc(&d_out, sizeof(cluster_output) * total_threads));
  HIP_CHECK(hipMemset(d_out, 0, sizeof(cluster_output) * total_threads));
  cluster_class_validation<<<grid, block>>>(d_out);
  HIP_CHECK(
      hipMemcpy(out.data(), d_out, sizeof(cluster_output) * total_threads, hipMemcpyDeviceToHost));

  // These checks are closly tied with cluster dims, a change in dims might result in failure
  for (size_t i = 0; i < total_threads; i++) {
    const auto& o = out[i];
    INFO("Index: " << i);

    REQUIRE(o.thread_index.x == i);
    REQUIRE(o.thread_index.y == 0);
    REQUIRE(o.thread_index.z == 0);
    REQUIRE(o.thread_rank == i);

    REQUIRE(o.dim_blocks.x == 2);
    REQUIRE(o.dim_blocks.y == 1);
    REQUIRE(o.dim_blocks.z == 1);

    REQUIRE(o.num_blocks == 2);
    REQUIRE(o.num_threads == total_threads);

    if (i < 8) {
      REQUIRE(o.block_index.x == 0);
      REQUIRE(o.block_index.y == 0);
      REQUIRE(o.block_index.z == 0);

      REQUIRE(o.block_rank == 0);
    } else {
      REQUIRE(o.block_index.x == 1);
      REQUIRE(o.block_index.y == 0);
      REQUIRE(o.block_index.z == 0);

      REQUIRE(o.block_rank == 1);
    }
  }
}