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/*! \file
    \brief Implicit GEMM testbed
*/
#pragma once

#include <fstream>

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

#include "cutlass/conv/device/implicit_gemm_convolution.h"
#include "cutlass/reduction/device/reduce_split_k.h"
#include "cutlass/reduction/thread/reduction_operators.h"

#include "conv2d_problems.h"

#include "cutlass/util/host_tensor.h"
#include "cutlass/util/reference/host/tensor_fill.h"
#include "cutlass/util/reference/device/tensor_compare.h"
#include "cutlass/util/reference/host/tensor_compare.h"
#include "cutlass/util/host_reorder.h"

#include "cutlass/util/reference/host/convolution.h"
#include "cutlass/util/reference/device/convolution.h"

#include "cutlass/core_io.h"
#include "cutlass/util/tensor_view_io.h"

#include "cache_testbed_output.h"

namespace test {
namespace conv {
namespace device {

template <typename Conv2d, int InterleavedK>
class InterleavedTestbedConv2d {
public:

  using ElementA = typename Conv2d::ElementA;
  using LayoutA = typename Conv2d::LayoutA;
  using ElementB = typename Conv2d::ElementB;
  using LayoutB = typename Conv2d::LayoutB;
  using ElementC = typename Conv2d::ElementC;
  using LayoutC = typename Conv2d::LayoutC;
  using ElementAccumulator = typename Conv2d::ElementAccumulator;
  using ElementCompute = typename Conv2d::ElementCompute;
  using EpilogueOutputOp = typename Conv2d::EpilogueOutputOp;

  static cutlass::conv::Operator const kConvolutionalOperator = Conv2d::kConvolutionalOperator;

  /// Reduction kernel
  using ReductionOp = cutlass::reduction::thread::ReduceAdd<
    ElementAccumulator, 
    typename EpilogueOutputOp::ElementAccumulator,
    EpilogueOutputOp::kCount
  >;

  using ReductionKernel = cutlass::reduction::kernel::ReduceSplitK<
    cutlass::MatrixShape<4, 32 * EpilogueOutputOp::kCount>,
    EpilogueOutputOp,
    ReductionOp
  >;

  using ReductionDevice = cutlass::reduction::device::ReduceSplitK<ReductionKernel>;
  using ReductionStrideIndex = typename ReductionDevice::StrideIndex;

public:

  /// Initialization
  cutlass::Distribution::Kind init_A;
  cutlass::Distribution::Kind init_B;
  cutlass::Distribution::Kind init_C;
  uint64_t seed;

  cutlass::HostTensor<ElementA, LayoutA> tensor_A;
  cutlass::HostTensor<ElementB, LayoutB> tensor_B;
  cutlass::HostTensor<ElementB, LayoutB> tensor_B_reordered;
  cutlass::HostTensor<ElementC, LayoutC> tensor_C;
  cutlass::HostTensor<ElementC, LayoutC> tensor_D_computed;
  cutlass::HostTensor<ElementC, LayoutC> tensor_D_reference;

public:

  InterleavedTestbedConv2d(
    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
  ):
    init_A(init_A_), init_B(init_B_), init_C(init_C_), seed(seed_) {

  }

    /// Helper to initialize a tensor view
  template <typename Element, typename Layout>
  void initialize_tensor(
    cutlass::TensorView<Element, Layout> view, 
    cutlass::Distribution::Kind dist_kind,
    uint64_t seed) {

    if (dist_kind == cutlass::Distribution::Uniform) {

      int scope;
      int bits = cutlass::sizeof_bits<Element>::value;

      if (bits <= 8) {
        scope = 2;
      }
      else if (bits == 16) {
        scope = 3;
      }
      else {
        scope = 8;
      }
      cutlass::reference::host::TensorFillRandomUniform(
        view, seed, scope, -scope, 0);
    } 
    else if (dist_kind == cutlass::Distribution::Identity) {

      cutlass::reference::host::TensorFillIdentity(view);
    } 
    else if (dist_kind == cutlass::Distribution::Gaussian) {

      cutlass::reference::host::TensorFillRandomGaussian(view, seed, 0, 0.5);
    }
    else if (dist_kind == cutlass::Distribution::Sequential) {

      cutlass::reference::host::BlockFillSequential(view.data(), view.capacity());
    } 
    else {
    }
  }

  void initialize(
    cutlass::conv::Conv2dProblemSize const &problem_size, uint64_t seed = 2019) {
        
    tensor_A.resize(implicit_gemm_tensor_a_extent(kConvolutionalOperator, problem_size));
    tensor_B.resize(implicit_gemm_tensor_b_extent(kConvolutionalOperator, problem_size));
    tensor_B_reordered.resize(implicit_gemm_tensor_b_extent(kConvolutionalOperator, problem_size));
    tensor_C.resize(implicit_gemm_tensor_c_extent(kConvolutionalOperator, problem_size));
    tensor_D_computed.resize(implicit_gemm_tensor_c_extent(kConvolutionalOperator, problem_size));
    tensor_D_reference.resize(implicit_gemm_tensor_c_extent(kConvolutionalOperator, problem_size));

    initialize_tensor(tensor_A.host_view(), init_A, seed); 
    initialize_tensor(tensor_B.host_view(), init_B, seed * 17); 
    initialize_tensor(tensor_C.host_view(), init_C, seed * 39);

    cutlass::reorder_convK<InterleavedK>(
        tensor_B_reordered.host_ref(), tensor_B.host_ref(), implicit_gemm_problem_size(kConvolutionalOperator, problem_size));

    tensor_A.sync_device();
    tensor_B.sync_device();
    tensor_B_reordered.sync_device();
    tensor_C.sync_device();
    tensor_D_computed.sync_device();
    tensor_D_reference.sync_device();
  }

  /// Executes one test
  bool run(
    cutlass::conv::Conv2dProblemSize const &problem_size,
    cutlass::conv::SplitKMode const &split_k_mode = cutlass::conv::SplitKMode::kSerial,
    ElementCompute alpha = ElementCompute(1),
    ElementCompute beta = ElementCompute(0)) {

#if 0 //display conv2d problem size for debugging
    std::cout << problem_size << std::endl
              << "alpha, beta: (" << float(alpha) << ", " << float(beta) << ")" << std::endl
              << "split_k_mode: " << ((split_k_mode == cutlass::conv::SplitKMode::kSerial) ? "(serial)" : "(parallel)") << std::endl
              << std::endl;
#endif

    initialize(problem_size);

    // configure the operator
    Conv2d conv2d_op;

    typename Conv2d::Arguments conv2d_args(
      problem_size,
      tensor_A.device_ref(),
      tensor_B_reordered.device_ref(),
      tensor_C.device_ref(),
      tensor_D_computed.device_ref(),
      {alpha, beta},
      split_k_mode
    );

    // find workspace requirement for parallel split-k reduction
    size_t workspace_size = Conv2d::get_workspace_size(conv2d_args);

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

    cutlass::Status status = conv2d_op.initialize(conv2d_args, workspace.get());

    // conv2d operation with parallel split-k-mode
    if (split_k_mode == cutlass::conv::SplitKMode::kParallel) {

      // conv2d output is written to workspace in global memory
      conv2d_args.ref_D.reset(reinterpret_cast<ElementC*>(workspace.get()));
      // accumulate mma for each cta in k-dimension (1.0 * A * B)
      conv2d_args.output_op = {ElementCompute(1), ElementCompute(0)}; 
      // update conv2d operator arguments
      status = conv2d_op.update(conv2d_args, workspace.get());
    }
    
    EXPECT_TRUE(status == cutlass::Status::kSuccess);
    if (status != cutlass::Status::kSuccess) {
      return false;
    }
  
    // run conv2d operator
    status = conv2d_op();
    
    EXPECT_TRUE(status == cutlass::Status::kSuccess);
    if (status != cutlass::Status::kSuccess) {
      return false;
    }

    if (split_k_mode == cutlass::conv::SplitKMode::kParallel) {

      // configure parallel reduction operator 
      ReductionDevice reduction_op;

      typename ReductionDevice::Arguments reduction_args(
        cutlass::conv::implicit_gemm_problem_size(kConvolutionalOperator, problem_size).mn(),
        problem_size.split_k_slices,
        cutlass::conv::implicit_gemm_tensor_c_size(kConvolutionalOperator, problem_size),
        {
          reinterpret_cast<ElementAccumulator*> (workspace.get()),
          ReductionStrideIndex(tensor_C.stride()[Conv2d::ImplicitGemmKernel::kTensorCStrideIdx])
        },
        {
          tensor_D_computed.device_data(),
          ReductionStrideIndex(tensor_C.stride()[Conv2d::ImplicitGemmKernel::kTensorCStrideIdx])
        },
        {
          tensor_C.device_data(),
          ReductionStrideIndex(tensor_C.stride()[Conv2d::ImplicitGemmKernel::kTensorCStrideIdx])
        },
        // apply alpha, beta to obtain the following equation alpha * ReduceAdd(A * B) + beta * C 
        {alpha, beta}
      );

      status = reduction_op.initialize(reduction_args, nullptr);

      EXPECT_TRUE(status == cutlass::Status::kSuccess);
      if (status != cutlass::Status::kSuccess) {
        return false;
      }

      // run prallel reduction kernel
      status = reduction_op();

      EXPECT_TRUE(status == cutlass::Status::kSuccess);
      if (status != cutlass::Status::kSuccess) {
        return false;
      }
    }
    bool passed = false;
    
    tensor_D_computed.sync_host();

    //
    // Reference check - support caching results
    //

    CachedTestKey cached_test_key = CreateCachedConv2dTestKey<
        ElementA, LayoutA,
        ElementB, LayoutB,
        ElementC, LayoutC,
        ElementAccumulator,
        ElementCompute
      >(
        kConvolutionalOperator,
        problem_size, 
        alpha, 
        beta, 
        tensor_A.host_view(),
        tensor_B.host_view(),
        tensor_C.host_view()
      );

    //
    // Look for the cached key
    //

    bool cached_result_loaded = false;
    CachedTestResult cached_test_result;

    std::string conv2d_result_cache_name = 
      std::string("cached_results_") + CUTLASS_TARGET_NAME + ".txt";

    if (CUTLASS_TEST_ENABLE_CACHED_RESULTS) {

      CachedTestResultListing cached_results(conv2d_result_cache_name);

      auto cached = cached_results.find(cached_test_key);

      cached_result_loaded = cached.first;
      if (cached_result_loaded) {
        cached_test_result = cached.second;
      }
    }
    
    if (!cached_result_loaded) {

#if CUTLASS_CONV_TEST_UNIT_REFERENCE_DEVICE_ENABLED

    cutlass::reference::device::Conv2d<
      ElementA,
      LayoutA,
      ElementB,
      LayoutB,
      ElementC,
      LayoutC,
      ElementCompute,
      ElementAccumulator,
      cutlass::NumericConverterClamp<ElementC, ElementCompute>
    >(
      kConvolutionalOperator,
      problem_size,
      tensor_A.device_ref(),
      tensor_B.device_ref(),
      tensor_C.device_ref(),
      tensor_D_reference.device_ref(),
      alpha, 
      beta);

    cudaError_t result = cudaDeviceSynchronize();
    EXPECT_EQ(result, cudaSuccess) << " device reference error: " 
                                   << cudaGetErrorString(result);

    // sync host (copy device data to host) for dumping error output in case of mismatches
    tensor_D_reference.sync_host();
    
#else 

    cutlass::reference::host::Conv2d<
      ElementA,
      LayoutA,
      ElementB,
      LayoutB,
      ElementC,
      LayoutC,
      ElementCompute,
      ElementAccumulator,
      cutlass::NumericConverterClamp<ElementC, ElementCompute>
    >(
      kConvolutionalOperator,
      problem_size,
      tensor_A.host_ref(),
      tensor_B.host_ref(),
      tensor_C.host_ref(),
      tensor_D_reference.host_ref(),
      alpha, 
      beta);

#endif

      if (CUTLASS_TEST_ENABLE_CACHED_RESULTS) {

        cached_test_result.D = TensorHash(tensor_D_reference.host_view());

        CachedTestResultListing cached_results(conv2d_result_cache_name);

        cached_results.append(cached_test_key, cached_test_result);
        cached_results.write(conv2d_result_cache_name);
      }
    } // if (!cached_result_loaded)

    uint32_t tensor_D_hash = TensorHash(tensor_D_computed.host_view());

    if (CUTLASS_TEST_ENABLE_CACHED_RESULTS) {
      passed = (tensor_D_hash == cached_test_result.D);

      EXPECT_EQ(tensor_D_hash, cached_test_result.D) 
        << "Hash-based comparison failed for key:" << "\n" << cached_test_key << "\n";
    }
    else {

      passed = cutlass::reference::host::TensorEquals(
        tensor_D_computed.host_view(), 
        tensor_D_reference.host_view());
    }

    EXPECT_TRUE(passed);

    if (!passed) {
      std::stringstream fname;

      fname << "error_Conv2d_ImplicitGemm_device_"
        << (split_k_mode == cutlass::conv::SplitKMode::kSerial ? "serial_reduction_" : "parallel_reduction_")
        << (Conv2d::kConvolutionalOperator == cutlass::conv::Operator::kFprop ? "fprop_" :
            (Conv2d::kConvolutionalOperator == cutlass::conv::Operator::kDgrad ? "dgrad_" : "wgrad_")) 
        << "ncxhwx_"
        << problem_size.N << "x"
        << problem_size.H << "x"
        << problem_size.W << "x"
        << problem_size.C 
        << "_cxrskx_"
        << problem_size.K << "x"
        << problem_size.R << "x"
        << problem_size.S << "x"
        << problem_size.C 
        << "_padding_" 
        << problem_size.pad_h << "x"
        << problem_size.pad_w 
        << "_stride_"  
        << problem_size.stride_h << "x"
        << problem_size.stride_w 
        << "_dilation_"
        << problem_size.dilation_h << "x"
        << problem_size.dilation_w << "_"
        << (problem_size.mode == cutlass::conv::Mode::kCrossCorrelation ? "xcorr_" : "conv_")
        << Conv2d::ThreadblockShape::kM << "x"  
        << Conv2d::ThreadblockShape::kN << "x"  
        << Conv2d::ThreadblockShape::kK << "_"
        << Conv2d::WarpShape::kM << "x"  
        << Conv2d::WarpShape::kN << "x"  
        << Conv2d::WarpShape::kK << ".txt";

      std::cout << fname.str() << std::endl;

      std::ofstream results(fname.str());

      results << problem_size << std::endl;

      results
        << "\nA:\n" << tensor_A.host_view() << "\n"
        << "\nB:\n" << tensor_B.host_view() << "\n"
        << "\nC:\n" << tensor_C.host_view() << "\n";

      results << "\nD reference (hash: " << cached_test_result.D << ")\n";

      if (!cached_result_loaded) {
        results
          << tensor_D_reference.host_view() << "\n";  
      }

      results
        << "\nD computed (hash: " << tensor_D_hash << ")\n" 
        << tensor_D_computed.host_view() << "\n";

    }

    return passed;
  }

};

/////////////////////////////////////////////////////////////////////////////////////////////////////////
// TestAllConv: Runs cutlass::conv::device::ImplicitGemmConvolution operator and compares it with reference
// TestAllConv runs conv operator on default conv problem sizes from test::conv::device::TestbedConv2dProblemSizes
// Additionaly, each conv2d test can provide conv problem sizes (conv_test_sizes) and blacklist of sizes 
// (conv_blacklist_sizes)
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
template <typename ImplicitGemm, int InterleavedK>
bool TestAllInterleavedConv2d(
  const Conv2dProblemVector & conv_test_sizes = Conv2dProblemVector(),
  const Conv2dProblemVector & conv_blacklist_sizes = Conv2dProblemVector()) {

  bool passed = true;

  //
  // Testbed object
  //

  InterleavedTestbedConv2d<ImplicitGemm, InterleavedK> testbed;

  //
  // Get conv problem sizes to run conv operator 
  //
  TestbedConv2dProblemSizes conv_problems(InterleavedK); // minimum channel size must be multiple of InterleavedK for interleaved layout

  // Vector of conv2d problem sizes to avoid duplicate runs
  Conv2dProblemVector conv_tested_sizes;

  Conv2dProblemVector const *problem_vectors[] = {
    &conv_test_sizes,                               // run user specified sizes
    &conv_problems.conv2d_default_sizes,            // run default and cudnn bug sizes
    &conv_problems.conv2d_resnet50_sizes,           // run resnet50 sizes
#if CUTLASS_CONV_UNIT_TEST_RIGOROUS_SIZE_ENABLED 
    &conv_problems.conv2d_rigorous_sizes,           // run large and rigorous sizes if enabled
#endif
  };

  // Sweep conv2d problem sizes (split-k-mode=kSerial, split-k-slice=1, alpha=1.0, beta=0.0)
  for (Conv2dProblemVector const * problem_vector : problem_vectors) {

    ChannelDivisibilitySpecification channel_spec(InterleavedK); //input and output channels must be multiple of InterleavedK
    auto pruned_problem_vector = prune(*problem_vector, channel_spec);

    //  Run conv testbed on default convolution sizes
    for(auto conv_problem : pruned_problem_vector) {

      // Skip blacklist and avoid duplicate problem sizes
      if (std::find(conv_blacklist_sizes.begin(), conv_blacklist_sizes.end(), conv_problem) != conv_blacklist_sizes.end() ||
          std::find(conv_tested_sizes.begin(), conv_tested_sizes.end(), conv_problem) != conv_tested_sizes.end()) {
        continue;
      }

      //
      // Procedurally disable certain cases
      //
  
      // CUTLASS DGRAD's unity stride specialization only support stride {1, 1} 
      if ((ImplicitGemm::kConvolutionalOperator == 
            cutlass::conv::Operator::kDgrad) && 
          (ImplicitGemm::ImplicitGemmKernel::Mma::IteratorA::kStrideSupport == 
            cutlass::conv::StrideSupport::kUnity)) {
        if (!((conv_problem.stride_h == 1) && (conv_problem.stride_w == 1))) {
          continue;
        }
      }

      //
      // Test
      //
      // push back tested problem size to avoid re-running duplicates
      conv_tested_sizes.push_back(conv_problem);

      // test mode = xcross
      passed = testbed.run(
        conv_problem,
        cutlass::conv::SplitKMode::kSerial);
    
      if (!passed) {
        return false;
      }

      // test mode = convolution
      passed = testbed.run(
        conv_problem.reset_mode(cutlass::conv::Mode::kConvolution),
        cutlass::conv::SplitKMode::kSerial);
    
      if (!passed) {
        return false;
      }
    }
  }

#if 0
  // Sweep split-k-slice using serial and prallel reduction with non-unity alpha and non-zero beta for 
  // a single conv2d problem size. Convolution unit tests take a long time to run so only sweep parameters 
  // which are abolutely neccessary to catch functional bugs. The below code does provide option to sweep 
  // alpha and beta for local testing, but only runs one value for alpha and beta.
  cutlass::conv::Conv2dProblemSize conv2d_split_k_test_size (
      {1, 17, 11, 288},   // input size (NHWC)
      {160, 3, 3, 288},   // filter size (KRSC)
      {1, 1, 1, 1},       // padding (pad_h, _, pad_w, _)
      {1, 1},             // stride (stride_h, stride_w)
      {1, 1}              // dilation (dilation_h, dilation_w)
    );

  cutlass::conv::SplitKMode split_k_modes [] = {
    cutlass::conv::SplitKMode::kSerial,
    cutlass::conv::SplitKMode::kParallel,
  };

  int split_k_slices[] = {
    1, 2, 3, 4, 201
  };

  double problem_alpha[] = {
    2.0
  };

  double problem_beta[] = {
    2.0
  };

  for (auto split_k_mode : split_k_modes) {
    for (auto split_k_slice : split_k_slices) {
      for (auto alpha : problem_alpha) {
        for (auto beta : problem_beta) {

          passed = testbed.run(
            conv2d_split_k_test_size.reset_split_k_slices(split_k_slice),
            split_k_mode,
            cutlass::from_real<typename ImplicitGemm::ElementCompute>(alpha), 
            cutlass::from_real<typename ImplicitGemm::ElementCompute>(beta));

          if (!passed) {
            return false;
          }
        }
      }
    }
  }
#endif

  return passed;
}

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

} // namespace device
} // namespace conv
} // namespace test
