/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2025. All rights reserved.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */

#ifndef RESCALEPARTITIONER_H
#define RESCALEPARTITIONER_H

#include "StreamPartitioner.h"

namespace omnistream::datastream {
template <typename T>
class RescalePartitioner : public StreamPartitioner<T> {
public:
    RescalePartitioner() : nextChannelToSendTo(-1)
    {
    }

    int selectChannel(T* record) override
    {
        if (++nextChannelToSendTo >= this->numberOfChannels) {
            nextChannelToSendTo = 0;
        }
        return nextChannelToSendTo;
    }

    std::unique_ptr<StreamPartitioner<T>> copy() override
    {
        return std::make_unique<RescalePartitioner<T>>(*this);
    }

    bool isPointWise() const override
    {
        return true;
    }

    std::string toString() const override
    {
        return "RESCALE";
    }

private:
    mutable int nextChannelToSendTo = -1;
};
} // namespace omnistream::datastream

#endif // RESCALEPARTITIONER_H