// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#include "util/debug_points.h"

#include "common/logging.h"

#include "util/time.h"

namespace doris {

DebugPoints::DebugPoints() : _debug_points(std::make_shared<const DebugPointMap>()) {}

DebugPoints* DebugPoints::instance() {

    static DebugPoints instance;

    return &instance;

}

bool DebugPoints::is_enable(const std::string& name) {

    return get_debug_point(name) != nullptr;

}

std::shared_ptr<DebugPoint> DebugPoints::get_debug_point(const std::string& name) {

    if (!config::enable_debug_points) {

        return nullptr;

    }

    auto map_ptr = std::atomic_load_explicit(&_debug_points, std::memory_order_relaxed);

    auto it = map_ptr->find(name);

    if (it == map_ptr->end()) {

        return nullptr;

    }

    auto debug_point = it->second;

    if ((debug_point->expire_ms > 0 && MonotonicMillis() >= debug_point->expire_ms) ||

        (debug_point->execute_limit > 0 &&

         debug_point->execute_num.fetch_add(1, std::memory_order_relaxed) >=

                 debug_point->execute_limit)) {

        remove(name);

        return nullptr;

    }

    return debug_point;

}

void DebugPoints::add(const std::string& name, std::shared_ptr<DebugPoint> debug_point) {

    update([&](DebugPointMap& new_points) { new_points[name] = debug_point; });

    std::ostringstream oss;

    oss << "{";

    for (auto [key, value] : debug_point->params) {

        oss << key << " : " << value << ", ";

    }

    oss << "}";

    LOG(INFO) << "add debug point: name=" << name << ", params=" << oss.str();

}

void DebugPoints::remove(const std::string& name) {

    bool exists = false;

    update([&](DebugPointMap& new_points) { exists = new_points.erase(name) > 0; });

    LOG(INFO) << "remove debug point: name=" << name << ", exists=" << exists;

}

void DebugPoints::update(std::function<void(DebugPointMap&)>&& handler) {

    auto old_points = std::atomic_load_explicit(&_debug_points, std::memory_order_relaxed);

    while (true) {

        auto new_points = std::make_shared<DebugPointMap>(*old_points);

        handler(*new_points);

        if (std::atomic_compare_exchange_strong_explicit(

                    &_debug_points, &old_points,

                    std::static_pointer_cast<const DebugPointMap>(new_points),

                    std::memory_order_relaxed, std::memory_order_relaxed)) {

            break;

        }

    }

}

void DebugPoints::clear() {

    std::atomic_store_explicit(&_debug_points, std::make_shared<const DebugPointMap>(),

                               std::memory_order_relaxed);

    LOG(INFO) << "clear debug points";

}

} // namespace doris