// Copyright 2021 The gRPC Authors
//
// Licensed 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 <grpc/support/port_platform.h>

#include <grpc/event_engine/event_engine.h>

#include "src/core/lib/gprpp/sync.h"

namespace grpc_event_engine {
namespace experimental {

namespace {
std::function<std::unique_ptr<EventEngine>()>* g_event_engine_factory = nullptr;
grpc_core::Mutex* g_mu = new grpc_core::Mutex();
}  // namespace

EventEngine* GetDefaultEventEngine() {
  static EventEngine* default_event_engine = CreateEventEngine().release();
  return default_event_engine;
}

void SetDefaultEventEngineFactory(
    std::function<std::unique_ptr<EventEngine>()>* factory) {
  grpc_core::MutexLock lock(g_mu);
  g_event_engine_factory = factory;
}

std::unique_ptr<EventEngine> CreateEventEngine() {
  grpc_core::MutexLock lock(g_mu);
  if (g_event_engine_factory == nullptr) {
    // TODO(hork): call LibuvEventEngineFactory
    abort();
  }
  return (*g_event_engine_factory)();
}

}  // namespace experimental
}  // namespace grpc_event_engine