// SPDX-License-Identifier: BSD-2-Clause
/* Copyright (C) 2014 - 2020 Intel Corporation. */

#include "perf_tests.hpp"
#include <iostream>
#include <cmath>
#include <gtest/gtest.h>

// Memkind performance tests
using std::cout;
using std::endl;
using std::abs;
using std::ostringstream;

// Memkind tests
class PerformanceTest : public testing::Test
{
protected:
    const double Tolerance = 0.15;
    const double Confidence = 0.10;

    Metrics referenceMetrics;
    Metrics performanceMetrics;
    PerfTestCase<performance_tests::MallocOperation> referenceTest;
    PerfTestCase<performance_tests::MemkindOperation> performanceTest;

    template<class T>
    static void RecordProperty(const string &key, const T value)
    {
        ostringstream values;
        values << value;
        testing::Test::RecordProperty(key, values.str());
    }

    void SetUp()
    {
    }

    void TearDown()
    {
    }

    bool checkDelta(double value, double reference, const string &info,
                    double delta, bool higherIsBetter = false)
    {
        // If higherIsBetter is true, current value should be >= (reference - delta); otherwise, it should be <= (reference + delta)
        double threshold = higherIsBetter ? reference * (1 - delta) : reference *
                           (1 + delta);
        cout <<
             "Metric: " << info << ". Reference value: " << reference << ". "
             "Expected: " << (higherIsBetter ? ">= " : "<= ") << threshold << " (delta = " <<
             delta << ")."
             "Actual: " << value << " (delta = " <<
             ((value > reference ? (value / reference) : (reference / value)) - 1.0) /
             ((higherIsBetter != (value > reference)) ? 1.0 : -1.0)
             << ")."
             << endl ;
        if (higherIsBetter ? (value <= threshold) : (value >= threshold)) {
            cout << "WARNING : Value of '" << info << "' outside expected bounds!" << endl;
            return false;
        }
        return true;
    }

    bool compareMetrics(Metrics metrics, Metrics reference, double delta)
    {
        bool result = true;
        result &= checkDelta(metrics.operationsPerSecond, reference.operationsPerSecond,
                             "operationsPerSecond", delta, true);
        result &= checkDelta(metrics.avgOperationDuration,
                             reference.avgOperationDuration, "avgOperationDuration", delta);
        return result;
    }

    void writeMetrics(Metrics metrics, Metrics reference)
    {
        RecordProperty("ops_per_sec", metrics.operationsPerSecond);
        RecordProperty("ops_per_sec_vs_ref",
                       (reference.operationsPerSecond - metrics.operationsPerSecond) * 100.0f
                       / reference.operationsPerSecond);
        RecordProperty("avg_op_time_nsec", metrics.avgOperationDuration);
        RecordProperty("avg_op_time_nsec_vs_ref",
                       (metrics.avgOperationDuration - reference.avgOperationDuration) * 100.0f
                       / reference.avgOperationDuration);
    }

    void run()
    {
        cout << "Running reference std::malloc test" << endl;
        referenceMetrics = referenceTest.runTest();

        cout << "Running memkind test" << endl;
        performanceMetrics = performanceTest.runTest();

        writeMetrics(performanceMetrics, referenceMetrics);
        EXPECT_TRUE(compareMetrics(performanceMetrics, referenceMetrics,
                                   Tolerance + Confidence));
    }
};

TEST_F(PerformanceTest, test_TC_MEMKIND_perf_single_op_single_iter)
{
    referenceTest.setupTest_singleOpSingleIter();
    performanceTest.setupTest_singleOpSingleIter();
    run();
}

TEST_F(PerformanceTest, test_TC_MEMKIND_perf_many_ops_single_iter)
{
    referenceTest.setupTest_manyOpsSingleIter();
    performanceTest.setupTest_manyOpsSingleIter();
    run();
}

TEST_F(PerformanceTest, test_TC_MEMKIND_perf_many_ops_single_iter_huge_alloc)
{
    referenceTest.setupTest_manyOpsSingleIterHugeAlloc();
    performanceTest.setupTest_manyOpsSingleIterHugeAlloc();
    run();
}

TEST_F(PerformanceTest, test_TC_MEMKIND_perf_single_op_many_iters)
{
    referenceTest.setupTest_singleOpManyIters();
    performanceTest.setupTest_singleOpManyIters();
    run();
}

TEST_F(PerformanceTest, test_TC_MEMKIND_perf_many_ops_many_iters)
{
    referenceTest.setupTest_manyOpsManyIters();
    performanceTest.setupTest_manyOpsManyIters();
    run();
}

TEST_F(PerformanceTest, test_TC_MEMKIND_perf_many_ops_many_iters_many_kinds)
{
    referenceTest.setupTest_manyOpsManyIters();
    performanceTest.setupTest_manyOpsManyIters();
    run();
}