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/*! \file
    \brief Tests for device-wide GEMM interface
*/

#pragma once

#include <iostream>
#include <sstream>

#include "../../common/cutlass_unit_test.h"

#include "testbed.h"

namespace test {
namespace gemm {
namespace device {

/////////////////////////////////////////////////////////////////////////////////////////////////

template <typename Gemm>
struct TestbedSplitK : public Testbed<Gemm> {

  using Base = Testbed<Gemm>;

  using ElementCompute = typename Base::ElementCompute;

  //
  // Methods
  //

  TestbedSplitK(
    cutlass::Distribution::Kind init_A_ = cutlass::Distribution::Uniform,
    cutlass::Distribution::Kind init_B_ = cutlass::Distribution::Uniform,
    cutlass::Distribution::Kind init_C_ = cutlass::Distribution::Uniform,
    uint64_t seed_ = 2080
  ):
    Base(init_A_, init_B_, init_C_, seed_) { }

  /// Returns true if the CUDA device is sufficient to execute the kernel.
  bool sufficient() const {
    //
    // Determine SMEM requirements and waive if not satisfied
    //

    int smem_size = int(sizeof(typename Gemm::GemmKernel::SharedStorage));

    cudaDeviceProp properties;
    int device_idx;
    cudaError_t result = cudaGetDevice(&device_idx);

    if (result != cudaSuccess) {
      throw std::runtime_error("cudaGetDevice() API call failed.");
    }

    result = cudaGetDeviceProperties(&properties, device_idx);

    if (result != cudaSuccess) {
      throw std::runtime_error("cudaGetDeviceProperties() failed");
    }

    if (properties.sharedMemPerMultiprocessor < smem_size) {
      return false;
    }

    return true;
  }
  
  /// Executes one test
  bool run(
    cutlass::gemm::GemmCoord problem_size, 
    int split_k_slices,
    ElementCompute alpha = ElementCompute(1), 
    ElementCompute beta = ElementCompute(0)) {

    // Waive test if insufficient CUDA device
    if (!sufficient()) {
      if (CUTLASS_TEST_UNIT_ENABLE_WARNINGS) {
        std::cerr << "Test waived due to insufficient CUDA device." << std::endl;
      }
      return true;
    }

    this->initialize(problem_size);

    //
    // Initialize the GEMM operator
    //

    typename Gemm::Arguments arguments{
      problem_size,
      this->tensor_A.device_ref(),
      this->tensor_B.device_ref(),
      this->tensor_C.device_ref(),
      this->tensor_D.device_ref(),
      {alpha, beta},
      split_k_slices
    };

    Gemm gemm_op;

    size_t workspace_size = Gemm::get_workspace_size(arguments);

    cutlass::device_memory::allocation<uint8_t> workspace(workspace_size);

    cutlass::Status status = gemm_op.initialize(arguments, workspace.get());

    EXPECT_TRUE(status == cutlass::Status::kSuccess);

    //
    // Run the GEMM
    //

    status = gemm_op();

    EXPECT_TRUE(status == cutlass::Status::kSuccess);

    //
    // Verify
    //

    return this->verify(problem_size, alpha, beta);
  }
};

/////////////////////////////////////////////////////////////////////////////////////////////////

template <typename Gemm>
bool TestAllGemmSplitK() {
  bool passed = true;

  cutlass::gemm::GemmCoord problem_sizes[] = {
    {8, 8, 2048},
    {8, 8, 2056},
    {264, 72, 520},
    {264, 520,  120},
    {264, 520,  264}
  };

  int split_k_slices[] = {
    1, 2, 4, 5, 7
  };

  double problem_alpha[] = {
    0.5
  };

  double problem_beta[] = {
    2.0
  };

  using Testbed = TestbedSplitK<Gemm>;
  using ElementCompute = typename Testbed::ElementCompute;

  Testbed testbed;

  for (auto problem_size : problem_sizes) {
    for (int split_k_count : split_k_slices) {
      for (double alpha : problem_alpha) {
        for (double beta : problem_beta) {

          passed = testbed.run(
            problem_size, 
            split_k_count,
            ElementCompute(alpha), 
            ElementCompute(beta)
          );

          if (!passed) {
            std::cout << "Failed on size " << problem_size << " with split_k_count " << split_k_count << std::endl;
            return false;
          }
        }
      }
    }
  }

  EXPECT_TRUE(passed);

  return passed;
}

/////////////////////////////////////////////////////////////////////////////////////////////////

} // namespace device
} // namespace gemm
} // namespace test

/////////////////////////////////////////////////////////////////////////////////////////////////
