/*
 * =============================================================================
 *   ROC Runtime Conformance Release License
 * =============================================================================
 * The University of Illinois/NCSA
 * Open Source License (NCSA)
 *
 * Copyright (c) 2025, Advanced Micro Devices, Inc.
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 *
 *                 AMD Research and AMD ROC Software Development
 *
 *                 Advanced Micro Devices, Inc.
 *
 *                 www.amd.com
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#include <chrono>
#include <cstdint>
#include <iostream>
#include <string>


#include "gtest/gtest.h"
#include "rocm_smi/rocm_smi.h"
#include "rocm_smi_test/functional/measure_api_execution_time.h"
#include "rocm_smi_test/test_common.h"
#include "rocm_smi/rocm_smi_utils.h"


TestMeasureApiExecutionTime::TestMeasureApiExecutionTime() : TestBase() {
  set_title("RSMI Measure API Execution Time");
  set_description("This test measures execution times for select APIs");
}

TestMeasureApiExecutionTime::~TestMeasureApiExecutionTime(void) {
}

void TestMeasureApiExecutionTime::SetUp(void) {
  TestBase::SetUp();
  return;
}

void TestMeasureApiExecutionTime::DisplayTestInfo(void) {
  TestBase::DisplayTestInfo();
}

void TestMeasureApiExecutionTime::DisplayResults(void) const {
  TestBase::DisplayResults();
  return;
}

void TestMeasureApiExecutionTime::Close() {
  // This will close handles opened within rsmitst utility calls and call
  // rsmi_shut_down(), so it should be done after other hsa cleanup
  TestBase::Close();
}

void TestMeasureApiExecutionTime::Run(void) {
  int64_t val_i64;
  rsmi_gpu_metrics_t smu;
  rsmi_temperature_metric_t met = RSMI_TEMP_CURRENT;
  rsmi_status_t ret;
  float repeat = 300.0;
  constexpr float kFAN_SPEED_ELAPSED_MICROSEC_BASE = (1000);
  /**
   * gpu_metrics can only refresh every 1000 microseconds (1 millisecs) due to FW
   * 
   * We have additional processing time (each read() -> fread()  ~ costs 900 microseconds).
   * We need to read 2x:
   * 1) reading metric's header to check support (~900 microseconds)
   * 2) read full metric based on defined structure (~900 microseconds)
   * 3) Setup backwards compatiblity (~100 microseconds)
   * 4) Put data into structures (~100 microseconds)
   * 5) Pass to public structure (~100 microseconds)
   * ---------------------------
   * ~2100 worst case
   * 
   * Note: performance of fread/mmap/read
   * https://github.com/nurettn/c-read-vs-mmap-vs-fread
   * 
   * Possible improvments ideas:
   * a) Initize "N/A" / Max UINT only for non-backwards comptable public struct
   * or arrays
   * b) Directly put data into public structure - this skips other copy/fill
   * procedures
   * c) Expirement with other file reading options
   **/ 
  constexpr float kMETRICS_ELAPSED_MICROSEC_BASE = (2100);
  bool skip = false;

  TestBase::Run();
  if (setup_failed_) {
    IF_VERB(STANDARD) {
      std::cout << "** SetUp Failed for this test. Skipping.**" << std::endl;
    }
    return;
  }

  auto test_start = std::chrono::high_resolution_clock::now();

  auto prev = std::cout.precision(3);
  for (uint32_t dv_ind = 0; dv_ind < num_monitor_devs(); ++dv_ind) {
    PrintDeviceHeader(dv_ind);

    // test execution time for rsmi_dev_fan_speed_get
    auto start = std::chrono::high_resolution_clock::now();
    for (int i=0; i < static_cast<int>(repeat); ++i) {
      ret = rsmi_dev_fan_speed_get(dv_ind, 0, &val_i64);
    }
    auto stop = std::chrono::high_resolution_clock::now();
    auto duration = std::chrono::duration_cast
                            <std::chrono::microseconds>(stop - start);

    std::cout << "\n\trsmi_dev_fan_speed_get returned: "
              << amd::smi::getRSMIStatusString(ret) << "\n";
    if (ret != RSMI_STATUS_SUCCESS) {
      skip = true;
    }
    std::cout << std:: endl;

    // Expected performance: (stop - start) over all iterations [in microseconds]
    //                          == (expected microseconds * # of iterations)

    if (!skip) {
      std::cout << "\trsmi_dev_fan_speed_get() total execution time: "
                << std::to_string((static_cast<float>(duration.count())))
                << " microseconds, expected < "
                << std::to_string((static_cast<float>(kFAN_SPEED_ELAPSED_MICROSEC_BASE) * repeat))
                << " microseconds" << std::endl;
      std::cout << "\trsmi_dev_fan_speed_get() average execution time: "
                << std::to_string(duration.count()/repeat) << " microseconds" << std::endl;
      EXPECT_LT(duration.count(), static_cast<float>(kFAN_SPEED_ELAPSED_MICROSEC_BASE) * repeat);
    }
    skip = false;

    // test execution time for rsmi_dev_temp_metric_get
    start = std::chrono::high_resolution_clock::now();
    for (int i=0; i < static_cast<int>(repeat); ++i) {
      ret = rsmi_dev_temp_metric_get(dv_ind, 0, met, &val_i64);
    }
    stop = std::chrono::high_resolution_clock::now();
    duration = std::chrono::duration_cast
                            <std::chrono::microseconds>(stop - start);

    std::cout << "\n\trsmi_dev_temp_metric_get returned: "
              << amd::smi::getRSMIStatusString(ret) << "\n";
    if (ret != RSMI_STATUS_SUCCESS) {
      skip = true;
    }
    if (!skip) {
      std::cout << "\trsmi_dev_temp_metric_get() total execution time: "
                << std::to_string((static_cast<float>(duration.count())))
                << " microseconds, expected < "
                << std::to_string((static_cast<float>(kMETRICS_ELAPSED_MICROSEC_BASE) * repeat))
                << " microseconds" << std::endl;
      std::cout << "\trsmi_dev_temp_metric_get() average execution time: "
                << std::to_string(duration.count()/repeat) << " microseconds"  << std::endl;
      EXPECT_LT(duration.count(), (static_cast<float>(kMETRICS_ELAPSED_MICROSEC_BASE) * repeat));
    }
    skip = false;

    // test execution time for rsmi_dev_gpu_metrics_info_get
    start = std::chrono::high_resolution_clock::now();
    for (int i=0; i < static_cast<int>(repeat); ++i) {
      ret = rsmi_dev_gpu_metrics_info_get(dv_ind, &smu);
    }
    stop = std::chrono::high_resolution_clock::now();
    duration = std::chrono::duration_cast
                            <std::chrono::microseconds>(stop - start);

    std::cout << "\n\trsmi_dev_gpu_metrics_info_get returned: "
              << amd::smi::getRSMIStatusString(ret) << "\n";
    if (ret != RSMI_STATUS_SUCCESS) {
      skip = true;
    }
    if (!skip) {
      std::cout << "\trsmi_dev_gpu_metrics_info_get() total execution time: "
                << std::to_string(static_cast<float>(duration.count()))
                << " microseconds, expected < "
                << std::to_string((kMETRICS_ELAPSED_MICROSEC_BASE * repeat))
                << " microseconds" << std::endl;
      std::cout << "\trsmi_dev_gpu_metrics_info_get() average execution time: "
                << std::to_string(duration.count()/repeat) << " microseconds" << std::endl;
      EXPECT_LT(static_cast<float>(duration.count()),
                static_cast<float>(kMETRICS_ELAPSED_MICROSEC_BASE) * repeat);
    }
    skip = false;

    auto val_ui16 = static_cast<uint16_t>(0);
    auto status_code(rsmi_status_t::RSMI_STATUS_SUCCESS);
    start = std::chrono::high_resolution_clock::now();
    for (int i=0; i < static_cast<int>(repeat); ++i) {
      status_code = rsmi_dev_metrics_xcd_counter_get(dv_ind, &val_ui16);
    }
    stop = std::chrono::high_resolution_clock::now();
    duration = std::chrono::duration_cast<std::chrono::microseconds>(stop - start);
    std::cout << "\n\tsmi_dev_metrics_xcd_counter_get returned: "
              << amd::smi::getRSMIStatusString(ret) << "\n";
    if (status_code != rsmi_status_t::RSMI_STATUS_SUCCESS) {
      skip = true;
    }
    if (!skip) {
      std::cout << "\trsmi_dev_metrics_xcd_counter_get() total execution time: "
                << std::to_string((static_cast<float>(duration.count())))
                << " microseconds, expected < "
                << std::to_string((static_cast<float>(kMETRICS_ELAPSED_MICROSEC_BASE) * repeat))
                << " microseconds" << std::endl;
      std::cout << "\trsmi_dev_metrics_xcd_counter_get() average execution time: "
                << std::to_string(duration.count()/repeat) << " microseconds" << std::endl;
      EXPECT_LT(duration.count(), static_cast<float>(kMETRICS_ELAPSED_MICROSEC_BASE) * repeat);
    }
    skip = false;
  }

  std::cout.precision(prev);
  auto test_stop = std::chrono::high_resolution_clock::now();
  auto test_duration = std::chrono::duration_cast<std::chrono::microseconds>(
                          test_stop - test_start);

  std::cout << "\n"
    << "============================================================================" << "\n";
  std::cout << "  Total execution time (All APIs): "
            << (test_duration.count()) << " microseconds" << "\n";
  std::cout
    << "============================================================================" << "\n";
}