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*/

#include <hip_test_common.hh>
#include <iterator>
#include <vector>
#include <mutex>
#include <condition_variable>
/**
 * Conformance test for checking functionality of
 * hipError_t hipGetDeviceFlags(unsigned int* flags);
 * hipError_t hipSetDeviceFlags(unsigned flags);
 *
 *
 * hipGetDeviceFlags and hipSetDeviceFlags tests.
 * Scenario1: Validates if hipGetDeviceFlags returns hipErrorInvalidValue for flags = nullptr.
 * Scenario2: Validates if hipSetDeviceFlags returns hipErrorInvalidValue for invalid flags.
 * Scenario3: Validates if flags returned by hipGetDeviceFlags are valid.
 * Scenario4: Validates that flags set with hipSetDeviceFlags can be retrieved with
 * hipGetDeviceFlags.
 * Scenario5: Validates that flags set with hipSetDeviceFlags can be retrieved on a seperate thread
 * with hipGetDeviceFlags.
 */
TEST_CASE("Unit_hipGetSetDeviceFlags_NullptrFlag") {
  // Scenario1
  HIP_CHECK_ERROR(hipGetDeviceFlags(nullptr), hipErrorInvalidValue);
}

TEST_CASE("Unit_hipGetSetDeviceFlags_InvalidFlag") {
#if HT_AMD
  HipTest::HIP_SKIP_TEST("EXSWCPHIPT-115");
  return;
#endif
  // Scenario2
  const unsigned int invalidFlag = GENERATE(0b011,     // schedule flags should not overlap
                                            0b101,     // schedule flags should not overlap
                                            0b110,     // schedule flags should not overlap
                                            0b111,     // schedule flags should not overlap
                                            0b100000,  // out of bounds
                                            0xFFFF);
  CAPTURE(invalidFlag);
  HIP_CHECK_ERROR(hipSetDeviceFlags(invalidFlag), hipErrorInvalidValue);
}

std::array<unsigned int, 16> getValidFlags() {
  constexpr std::array<unsigned int, 4> scheduleFlags{hipDeviceScheduleAuto, hipDeviceScheduleSpin,
                                                      hipDeviceScheduleYield,
                                                      hipDeviceScheduleBlockingSync};
  constexpr std::array<unsigned int, 2> hostMapFlags{0, hipDeviceMapHost};
  constexpr std::array<unsigned int, 2> localMemResizeFlags{0, 0x10};  // FIXME EXSWCPHIPT-110
  constexpr size_t size = scheduleFlags.size() * hostMapFlags.size() * localMemResizeFlags.size();
  std::array<unsigned int, size> validFlags;
  int i = 0;
  for (auto sf : scheduleFlags) {
    for (auto hf : hostMapFlags) {
      for (auto lf : localMemResizeFlags) {
        validFlags[i] = sf | hf | lf;
        i += 1;
      }
    }
  }
  return validFlags;
}


TEST_CASE("Unit_hipGetSetDeviceFlags_ValidFlag") {
  // Scenario3
  auto validFlags = getValidFlags();

  unsigned int flag = 0;
  HIP_CHECK(hipGetDeviceFlags(&flag));
  REQUIRE(std::find(std::begin(validFlags), std::end(validFlags), flag) != std::end(validFlags));
}

TEST_CASE("Unit_hipGetSetDeviceFlags_SetThenGet") {
  // Scenario4
  auto validFlags = getValidFlags();

  auto devNo = GENERATE(range(0, HipTest::getDeviceCount()));
  HIP_CHECK(hipSetDevice(devNo));

  const unsigned int flag = GENERATE_COPY(from_range(std::begin(validFlags), std::end(validFlags)));
  HIP_CHECK(hipSetDeviceFlags(flag));

  unsigned int getFlag;
  HIP_CHECK(hipGetDeviceFlags(&getFlag));
// flags other than hipDeviceSchedule* are ignore on the ROCm backend
#if HT_NVIDIA
  // CUDA backend will sometimes set other flags
  getFlag = getFlag & hipDeviceScheduleMask;
#endif
  REQUIRE((flag & hipDeviceScheduleMask) == getFlag);
}

TEST_CASE("Unit_hipGetSetDeviceFlags_Threaded") {
  // Scenario5
  auto validFlags = getValidFlags();

  auto devNo = GENERATE(range(0, HipTest::getDeviceCount()));
  HIP_CHECK(hipSetDevice(devNo));

  std::mutex mut;
  std::condition_variable cv;
  bool ready = false;  // required to avoid spurious wakeups

  const unsigned int flag = GENERATE_COPY(from_range(std::begin(validFlags), std::end(validFlags)));
  std::thread test_thread([&mut, &ready, &cv, devNo, flag]() {
    std::unique_lock<std::mutex> lock(mut);
    cv.wait(lock, [&ready] { return ready; });
    unsigned int getFlag;
    HIP_CHECK_THREAD(hipSetDevice(devNo));
    HIP_CHECK_THREAD(hipGetDeviceFlags(&getFlag));
// flags other than hipDeviceSchedule* are ignore on the ROCm backend
#if HT_NVIDIA
    // CUDA backend will set other flags we aren't concerned about
    getFlag = getFlag & hipDeviceScheduleMask;
#endif
    REQUIRE_THREAD((flag & hipDeviceScheduleMask) == getFlag);
  });

  {
    std::lock_guard<std::mutex> lock(mut);
    HIP_CHECK(hipSetDeviceFlags(flag));
    ready = true;
  }

  cv.notify_one();

  test_thread.join();
  HIP_CHECK_THREAD_FINALIZE();
}