/*
 * 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.
 */

#pragma once

#include <cstdint>
#include <memory>
#include <optional>
#include <vector>

#include "paimon/fs/file_system.h"
#include "paimon/memory/memory_pool.h"
#include "paimon/reader/count_reader.h"
#include "paimon/result.h"

namespace paimon {
class DataSplitImpl;
class Split;

class AppendCountReader : public CountReader {
 public:
    explicit AppendCountReader(std::vector<std::shared_ptr<Split>> splits,
                               const std::shared_ptr<FileSystem>& file_system,
                               const std::shared_ptr<MemoryPool>& pool)
        : splits_(std::move(splits)), file_system_(file_system), pool_(pool) {}

    Result<int64_t> CountRows() override;

 private:
    Result<int64_t> CountSingleSplit(const std::shared_ptr<Split>& split) const;
    Result<int64_t> MetadataCount(const std::shared_ptr<DataSplitImpl>& split) const;

 private:
    std::vector<std::shared_ptr<Split>> splits_;
    std::shared_ptr<FileSystem> file_system_;
    std::shared_ptr<MemoryPool> pool_;
};

}  // namespace paimon
