// Copyright (c) 2020-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <bench/bench.h>
#include <logging.h>
#include <test/util/setup_common.h>

#include <functional>
#include <vector>

// All but 2 of the benchmarks should have roughly similar performance:
//
// LogWithoutDebug should be ~3 orders of magnitude faster, as nothing is logged.
//
// LogWithoutWriteToFile should be ~2 orders of magnitude faster, as it avoids disk writes.

static void Logging(benchmark::Bench& bench, const std::vector<const char*>& extra_args, const std::function<void()>& log)
{
    // Reset any enabled logging categories from a previous benchmark run.
    LogInstance().DisableCategory(BCLog::LogFlags::ALL);

    TestingSetup test_setup{
        ChainType::REGTEST,
        {.extra_args = extra_args},
    };

    bench.run([&] { log(); });
}

static void LogWithDebug(benchmark::Bench& bench)
{
    Logging(bench, {"-logthreadnames=0", "-debug=net"}, [] { LogDebug(BCLog::NET, "%s\n", "test"); });
}

static void LogWithoutDebug(benchmark::Bench& bench)
{
    Logging(bench, {"-logthreadnames=0", "-debug=0"}, [] { LogDebug(BCLog::NET, "%s\n", "test"); });
}

static void LogWithThreadNames(benchmark::Bench& bench)
{
    Logging(bench, {"-logthreadnames=1"}, [] { LogInfo("%s\n", "test"); });
}

static void LogWithoutThreadNames(benchmark::Bench& bench)
{
    Logging(bench, {"-logthreadnames=0"}, [] { LogInfo("%s\n", "test"); });
}

static void LogWithoutWriteToFile(benchmark::Bench& bench)
{
    // Disable writing the log to a file, as used for unit tests and fuzzing in `MakeNoLogFileContext`.
    Logging(bench, {"-nodebuglogfile", "-debug=1"}, [] {
        LogInfo("%s\n", "test");
        LogDebug(BCLog::NET, "%s\n", "test");
    });
}

BENCHMARK(LogWithDebug, benchmark::PriorityLevel::HIGH);
BENCHMARK(LogWithoutDebug, benchmark::PriorityLevel::HIGH);
BENCHMARK(LogWithThreadNames, benchmark::PriorityLevel::HIGH);
BENCHMARK(LogWithoutThreadNames, benchmark::PriorityLevel::HIGH);
BENCHMARK(LogWithoutWriteToFile, benchmark::PriorityLevel::HIGH);