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#include <gtest/gtest.h>
#include <hip/hip_runtime.h>
#include <rocprofiler.h>

#include <functional>
#include <iostream>
#include <thread>
#include <vector>

#include "src/utils/helper.h"
#include "utils/test_utils.h"

/** \mainpage ROC Profiler API Test
 *
 * \section introduction Introduction
 *
 * The goal of this test is to check ROCmTools APIs from multiple threads
 * and verify if each API succeeds and multiple contexts are collected and
 * verified.
 *
 * An empty kernel is launched on multiple threads and profiling context is
 * collected and verified from each thread.
 */

// empty kernel
__global__ void kernel() {}

class ProfilerAPITest : public ::testing::Test {
 protected:
  // function to check profiler API status
  static void CheckApi(rocprofiler_status_t status) {
    ASSERT_EQ(status, ROCPROFILER_STATUS_SUCCESS);
  };

  // launches an empty kernel in profiler context
  static void KernelLaunch() {
    // run empty kernel
    kernel<<<1, 1>>>();
    hipDeviceSynchronize();
  }

  // callback function to dump profiler data
  static void FlushCallback(const rocprofiler_record_header_t* record,
                            const rocprofiler_record_header_t* end_record,
                            int64_t session_id) {
    while (record < end_record) {
      if (!record) break;
      if (record->kind == ROCPROFILER_PROFILER_RECORD) {
        const rocprofiler_record_profiler_t* profiler_record =
            reinterpret_cast<const rocprofiler_record_profiler_t*>(record);
        size_t name_length;
        CheckApi(rocprofiler_query_kernel_info_size(
            ROCPROFILER_KERNEL_NAME, profiler_record->kernel_id, &name_length));
        const char* kernel_name_c =
            static_cast<const char*>(malloc(name_length * sizeof(char)));
        CheckApi(rocprofiler_query_kernel_info(ROCPROFILER_KERNEL_NAME,
                                             profiler_record->kernel_id,
                                             &kernel_name_c));
        int gpu_index = profiler_record->gpu_id.handle;
        uint64_t start_time = profiler_record->timestamps.begin.value;
        uint64_t end_time = profiler_record->timestamps.end.value;

        // Check for each kernel if endtime > starttime
        ASSERT_GT(end_time, start_time);

        // Check for each kernel name_length is +ve
        ASSERT_GT(name_length, 0);

        // Check kernel name
        ASSERT_EQ(
            rocmtools::truncate_name(rocmtools::cxx_demangle(kernel_name_c)),
            "kernel");
      }
      CheckApi(rocprofiler_next_record(record, &record));
    }
  }
};

TEST_F(ProfilerAPITest, WhenRunningMultipleThreadsProfilerAPIsWorkFine) {
  // Get the system cores
  int num_cpu_cores = GetNumberOfCores();

  // create as many threads as number of cores in system
  std::vector<std::thread> threads(num_cpu_cores);

  // inititalize profiler by creating rocmtool object
  CheckApi(rocprofiler_initialize());

  // Counter Collection with timestamps
  rocprofiler_session_id_t session_id;
  std::vector<const char*> counters;
  counters.emplace_back("SQ_WAVES");
  CheckApi(rocprofiler_create_session(ROCPROFILER_APPLICATION_REPLAY_MODE,
                                    &session_id));
  CheckApi(rocprofiler_add_session_mode(session_id, ROCPROFILER_ASYNC_FLUSH,
                                      ROCPROFILER_COUNTERS_COLLECTION));
  CheckApi(rocprofiler_set_session_async_callback(
      session_id, ROCPROFILER_COUNTERS_COLLECTION,
      rocprofiler_session_buffer_size_t{0x8000}, FlushCallback,
      rocprofiler_flush_buffer_interval_t{0}));
  rocprofiler_filter_t filter{ROCPROFILER_FILTER_PROFILER_COUNTER_NAMES,
                            &counters[0],
                            rocprofiler_filter_data_count_t{counters.size()}};
  CheckApi(rocprofiler_session_set_filters(ROCPROFILER_COUNTERS_COLLECTION,
                                         &filter, rocprofiler_filters_count_t{1},
                                         session_id));

  // activating profiler session
  CheckApi(rocprofiler_start_session(session_id));

  // launch kernel on each thread
  for (int n = 0; n < num_cpu_cores; ++n) {
    threads[n] = std::thread(KernelLaunch);
  }

  // wait for all kernel launches to complete
  for (int n = 0; n < num_cpu_cores; ++n) {
    threads[n].join();
  }
  // dump profiler data
  CheckApi(rocprofiler_flush_data(session_id));

  // deactivate session
  CheckApi(rocprofiler_terminate_session(session_id));

  // destroy session
  CheckApi(rocprofiler_destroy_session(session_id));

  // finalize profiler by destroying rocmtool object
  CheckApi(rocprofiler_finalize());
}