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/*! \file
    \brief Tests for grouped GEMM problem visitors
*/

#pragma once

#include <iostream>
#include <numeric>

#include "../../common/hytlass_unit_test.h"
#include "hytlass/hytlass.h"

#include "hytlass/gemm/gemm.h"
#include "hytlass/gemm/kernel/gemm_grouped_problem_visitor.h"
#include "hytlass/gemm/kernel/grouped_problem_visitor.h"
#include "hytlass/util/device_memory.h"

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

namespace test {
namespace gemm {
namespace device {

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

// Use simple problem visitor as a baseline
template <typename ProblemSizeHelper,
          typename ThreadblockShape,
          int PrefetchTileCount,
          int ThreadCount>
struct BaselineProblemVisitor : public hytlass::gemm::kernel::BaseGroupedProblemVisitor<ProblemSizeHelper, ThreadblockShape> {
  using Base = hytlass::gemm::kernel::BaseGroupedProblemVisitor<ProblemSizeHelper, ThreadblockShape>;
  using Params = typename Base::Params;
  static int const kThreadCount = ThreadCount;

  struct SharedStorage {};

  int32_t tile_count_sum;
  SharedStorage &shared_storage;

  //
  // Methods
  //
  HYTLASS_DEVICE
  BaselineProblemVisitor(
    Params const &params_,
    SharedStorage &shared_storage_,
    int32_t block_idx
  ): Base(params_, block_idx),
  shared_storage(shared_storage_)
  {
    hytlass::gemm::GemmCoord problem = this->problem_size();
    hytlass::gemm::GemmCoord  grid = this->grid_shape(problem);
    tile_count_sum = this->tile_count(grid);
  }

  HYTLASS_DEVICE
  bool next_tile() {
    if (this->tile_idx < tile_count_sum) {
      return true;
    }

    do {
      ++this->problem_idx;

      if (this->problem_idx >= this->params.problem_count) {
        return false;
      }

      hytlass::gemm::GemmCoord problem = this->problem_size();
      hytlass::gemm::GemmCoord  grid = this->grid_shape(problem);

      this->problem_tile_start = tile_count_sum;
      tile_count_sum += this->tile_count(grid);

    } while (tile_count_sum <= this->tile_idx);

    return true;
  }

  static size_t get_workspace_size(const hytlass::gemm::GemmCoord* host_problem_sizes_ptr,
                                   int32_t problem_count,
                                   int32_t block_count) {
    return 0;
  }

  static void host_precompute(const hytlass::gemm::GemmCoord* host_problem_sizes_ptr,
                              int32_t problem_count,
                              int32_t block_count,
                              void* host_workspace_ptr) {}
};

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

template <typename ProblemVisitor>
struct ProblemVisitorKernel {
  struct SharedStorage {
    typename ProblemVisitor::SharedStorage problem_visitor;
  };

  struct Params {
    typename ProblemVisitor::Params problem_visitor_params;
    int32_t* visited_problems_ptr;
    int32_t* visited_tiles_ptr;
    int32_t visits_per_block;

    Params():
      visited_problems_ptr(nullptr),
      visited_tiles_ptr(nullptr),
      visits_per_block(0) {}

    Params(typename ProblemVisitor::Params problem_visitor_params_,
           int32_t* visited_problems_ptr_,
           int32_t* visited_tiles_ptr_,
           int32_t visits_per_block_):
      problem_visitor_params(problem_visitor_params_),
      visited_problems_ptr(visited_problems_ptr_),
      visited_tiles_ptr(visited_tiles_ptr_),
      visits_per_block(visits_per_block_) {}
  };

  HYTLASS_DEVICE
  void operator()(const Params& params, SharedStorage &shared_storage) {
    int32_t store_offset = params.visits_per_block * blockIdx.x;
    ProblemVisitor problem_visitor(params.problem_visitor_params,
                                   shared_storage.problem_visitor,
                                   blockIdx.x);

    while (problem_visitor.next_tile()) {
      int32_t problem_idx = problem_visitor.problem_index();
      int32_t threadblock_idx = int32_t(problem_visitor.threadblock_idx());

      if (threadIdx.x == 0) {
        params.visited_problems_ptr[store_offset] = problem_idx;
        params.visited_tiles_ptr[store_offset] = threadblock_idx;
        ++store_offset;
      }
      problem_visitor.advance(gridDim.x);
    }
  }
};

template <typename ProblemVisitor>
struct ProblemVisitorRunner {
  using BaseKernel = ProblemVisitorKernel<ProblemVisitor>;
  using Params = typename BaseKernel::Params;

  Params params;
  std::vector<hytlass::gemm::GemmCoord> host_problem_sizes;
  int32_t problem_count;
  int32_t threadblock_count;
  int32_t visits_per_block;
  hytlass::DeviceAllocation<int32_t> visited_problems;
  hytlass::DeviceAllocation<int32_t> visited_tiles;
  hytlass::DeviceAllocation<hytlass::gemm::GemmCoord> device_problem_sizes;
  hytlass::DeviceAllocation<uint8_t> workspace;
  std::vector<int32_t> host_visited_problems;
  std::vector<int32_t> host_visited_tiles;

  ProblemVisitorRunner(const std::vector<hytlass::gemm::GemmCoord>& host_problem_sizes_,
                       int32_t threadblock_count_):
      host_problem_sizes(host_problem_sizes_),
      problem_count(int32_t(host_problem_sizes_.size())),
      threadblock_count(threadblock_count_) {}

  /// Initializes GEMM state from arguments.
  hytlass::Status initialize() {
    size_t workspace_bytes = ProblemVisitor::get_workspace_size(
                                host_problem_sizes.data(),
                                problem_count,
                                threadblock_count);

    workspace.reset(workspace_bytes);
    std::vector<uint8_t> host_workspace(workspace_bytes);

    int32_t tile_count = ProblemVisitor::group_tile_count(host_problem_sizes.data(), problem_count);

    ProblemVisitor::host_precompute(host_problem_sizes.data(), problem_count,
                                    threadblock_count, host_workspace.data());

    workspace.copy_from_host(host_workspace.data(), workspace_bytes);

    device_problem_sizes.reset(problem_count);
    device_problem_sizes.copy_from_host(host_problem_sizes.data(), problem_count);

    visits_per_block = (tile_count - 1 + threadblock_count) / threadblock_count;
    int32_t total_visits = visits_per_block * threadblock_count;

    visited_problems.reset(total_visits);
    visited_tiles.reset(total_visits);
    host_visited_problems.resize(total_visits);
    host_visited_tiles.resize(total_visits);

    hipError_t result = hipMemset(visited_problems.get(), -1, sizeof(int32_t) * total_visits);
    if (result != hipSuccess) {
      return hytlass::Status::kErrorInternal;
    }

    result = hipMemset(visited_tiles.get(), -1, sizeof(int32_t) * total_visits);
    if (result != hipSuccess) {
      return hytlass::Status::kErrorInternal;
    }

    typename ProblemVisitor::Params pv_params(device_problem_sizes.get(), problem_count, workspace.get(), tile_count);
    params = Params(pv_params, visited_problems.get(), visited_tiles.get(), visits_per_block);

    return hytlass::Status::kSuccess;
  }

  bool verify() {
    // Sort by problem size and then by threadblock_idx
    std::vector<int32_t> indices(host_visited_problems.size());
    std::iota(indices.begin(), indices.end(), 0);

    std::stable_sort(indices.begin(), indices.end(),
      [&](int32_t i1, int32_t i2) {
        if (host_visited_problems[i1] == host_visited_problems[i2]) {
          return host_visited_tiles[i1] < host_visited_tiles[i2];
        }
        return host_visited_problems[i1] < host_visited_problems[i2];
      });

    int32_t idx = 0;

    // Skip any entries that were not visited
    while (host_visited_problems[indices[idx]] == -1) {
      ++idx;
    }

    // Check that each problem visited has the tiles we expect
    for (int32_t problem_idx = 0; problem_idx < problem_count; ++problem_idx) {
      auto problem = host_problem_sizes[problem_idx];
      ProblemVisitor::possibly_transpose_problem(problem);
      int32_t problem_tiles = ProblemVisitor::tile_count(ProblemVisitor::grid_shape(problem));
      for (int i = 0; i < problem_tiles; ++i) {
        EXPECT_EQ(problem_idx, host_visited_problems[indices[idx]]);
        EXPECT_EQ(i, host_visited_tiles[indices[idx]]);
        ++idx;
      }
    }

    return true;
  }

  bool run(hipStream_t stream = nullptr) {
    hytlass::Status status = initialize();
    if (status != hytlass::Status::kSuccess) {
      std::cerr << "Initialization failed" << std::endl;
      return false;
    }

    dim3 grid(threadblock_count, 1, 1);
    dim3 block(ProblemVisitor::kThreadCount, 1, 1);
    int smem_size = int(sizeof(typename BaseKernel::SharedStorage));

    hytlass::Kernel<BaseKernel><<<grid, block, smem_size, stream>>>(params);

    hipError_t result = hipGetLastError();
    if (result != hipSuccess) {
      std::cerr << "grid launch failed with error " << hipGetErrorString(result) << std::endl;
      return false;
    }

    result = hipDeviceSynchronize();
    if (result != hipSuccess) {
      std::cerr << "hipDeviceSynchronize failed with error " << hipGetErrorString(result) << std::endl;
      return false;
    }

    visited_problems.copy_to_host(host_visited_problems.data());
    visited_tiles.copy_to_host(host_visited_tiles.data());

    return verify();
  }
};

template <typename ThreadblockShape,
          int PrefetchTileCount,
          int ThreadCount,
          bool Transpose,
          hytlass::gemm::kernel::GroupScheduleMode GroupScheduleMode0,
          hytlass::gemm::kernel::GroupScheduleMode... Args>
struct TestbedGroupedGemmScheduler {

  using PSHelper = hytlass::gemm::kernel::detail::GemmGroupedProblemSizeHelper<ThreadblockShape, Transpose>;
  using BaselinePV = BaselineProblemVisitor<PSHelper,
                                            ThreadblockShape,
                                            PrefetchTileCount,
                                            ThreadCount>;

  //
  // Data members
  //
  uint32_t seed;
  int problem_count;
  int threadblock_count;
  std::vector<hytlass::gemm::GemmCoord> problem_sizes_host;

  //
  // Methods
  //

  TestbedGroupedGemmScheduler(uint32_t seed_ = 3080):
    seed(seed_) { srand(seed); }

  /// Initializes data structures
  void initialize(int32_t scale_factor) {

    //
    // Choose random problem sizes
    //

    problem_sizes_host.clear();
    problem_sizes_host.resize(problem_count);

    for (int32_t i = 0; i < problem_count; ++i) {

      hytlass::gemm::GemmCoord problem(
        scale_factor * (rand() % 64) + 24,
        scale_factor * (rand() % 64) + 24,
        scale_factor * (rand() % 64) + 24);

      problem_sizes_host.at(i) = problem;
    }
  }

  template <hytlass::gemm::kernel::GroupScheduleMode GroupScheduleMode_>
  void compare_visitors(const ProblemVisitorRunner<BaselinePV>& baseline_runner) {
    using PV = hytlass::gemm::kernel::GemmGroupedProblemVisitor<
                                         ThreadblockShape,
                                         GroupScheduleMode_,
                                         PrefetchTileCount,
                                         ThreadCount,
                                         Transpose>;
    ProblemVisitorRunner<PV> runner(problem_sizes_host, threadblock_count);
    EXPECT_TRUE(runner.run());

    // Check that this problem visitor visits the same problems and tiles as the baseline
    EXPECT_EQ(baseline_runner.host_visited_problems, runner.host_visited_problems);
    EXPECT_EQ(baseline_runner.host_visited_tiles, runner.host_visited_tiles);
  }

  template <hytlass::gemm::kernel::GroupScheduleMode GroupScheduleMode1_,
            hytlass::gemm::kernel::GroupScheduleMode GroupScheduleMode2_,
            hytlass::gemm::kernel::GroupScheduleMode... Rest>
  void compare_visitors(const ProblemVisitorRunner<BaselinePV>& baseline_runner) {
    // Compare the next visitor with the baseline visitor
    compare_visitors<GroupScheduleMode1_>(baseline_runner);

    // Recurse to compare the next visitors
    compare_visitors<GroupScheduleMode2_, Rest...>(baseline_runner);
  }

  /// Executes the test on all scheduler modes
  void run(int problem_count, int threadblock_count, int scale_factor=8) {

    this->problem_count = problem_count;
    this->threadblock_count = threadblock_count;

    // Initialize the problem
    initialize(scale_factor);

    // Run the baseline visitor to which we will compare all other visitors
    ProblemVisitorRunner<BaselinePV> baseline_runner(problem_sizes_host, threadblock_count);
    EXPECT_TRUE(baseline_runner.run());

    compare_visitors<Args...>(baseline_runner);
  }
};

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

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

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