/*
 * Copyright (c) 2023 Fancy Code.
 * 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 "IHalCpp.h"
#include "ILog.h"
#include <memory>
std::shared_ptr<IHalCpp> &IHalCpp::GetInstance(std::shared_ptr<IHalCpp> *impl)
{
    static std::shared_ptr<IHalCpp> instance = std::make_shared<IHalCpp>();
    static bool instanceChanging = false;
    if (impl && false == instanceChanging) {
        // Don't use std::mutex for runing faster.
        // Sleep for difference thread to release instance.
        instanceChanging = true;
        // std::this_thread::sleep_for(std::chrono::milliseconds(100)); // Don't sleep and make sure that start fast.
        if (instance.use_count() == 1) // bug?
        {
            LogInfo("Instance change succeed.\n");
            instance = *impl;
        }
        else {
            LogError("[ error ] instance change failed, using by some one.\n");
        }
        instanceChanging = false;
    }
    if (instanceChanging) {
        static std::shared_ptr<IHalCpp> tmporaryInstance = std::make_shared<IHalCpp>();
        return tmporaryInstance;
    }
    return instance;
}