// 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 <cstddef>

#include <map>

#include <memory>

#include <optional>

#include <string>

#include <unordered_map>

#include <unordered_set>

#include <vector>

#include "cctz/time_zone.h"

#include "common/status.h"

#include "format/generic_reader.h"

#include "paimon/reader/batch_reader.h"

#include "paimon/table/source/split.h"

#include "storage/olap_scan_common.h"

namespace paimon {

class TableRead;

class Predicate;

} // namespace paimon

namespace doris {

class RuntimeProfile;

class RuntimeState;

class SlotDescriptor;

} // namespace doris

namespace doris {

class Block;

class PaimonCppReader : public GenericReader {

    ENABLE_FACTORY_CREATOR(PaimonCppReader);

public:

    PaimonCppReader(const std::vector<SlotDescriptor*>& file_slot_descs, RuntimeState* state,

                    RuntimeProfile* profile, const TFileRangeDesc& range,

                    const TFileScanRangeParams* range_params);

    ~PaimonCppReader() override;

    Status init_reader();

    Status _do_get_next_block(Block* block, size_t* read_rows, bool* eof) override;

    Status _get_columns_impl(std::unordered_map<std::string, DataTypePtr>* name_to_type) override;

    Status close() override;

    void set_predicate(std::shared_ptr<paimon::Predicate> predicate) {

        _predicate = std::move(predicate);

    }

protected:

    Status on_before_init_reader(ReaderInitContext* ctx) override;

    Status on_after_read_block(Block* block, size_t* read_rows) override;

    Status _do_init_reader(ReaderInitContext* /*ctx*/) override { return init_reader(); }

private:

    Status _fill_partition_columns(Block* block, size_t num_rows);

    Status _init_paimon_reader();

    Status _decode_split(std::shared_ptr<paimon::Split>* split);

    // Resolve paimon table root path for schema/manifest lookup.

    std::optional<std::string> _resolve_table_path() const;

    std::vector<std::string> _build_read_columns() const;

    std::map<std::string, std::string> _build_options() const;

    const std::vector<SlotDescriptor*>& _file_slot_descs;

    RuntimeState* _state = nullptr;

    [[maybe_unused]] RuntimeProfile* _profile = nullptr;

    const TFileRangeDesc& _range;

    const TFileScanRangeParams* _range_params = nullptr;

    std::shared_ptr<paimon::Split> _split;

    std::unique_ptr<paimon::TableRead> _table_read;

    std::unique_ptr<paimon::BatchReader> _batch_reader;

    std::shared_ptr<paimon::Predicate> _predicate;

    std::unordered_map<std::string, std::tuple<std::string, const SlotDescriptor*>>

            _partition_values;

    std::unordered_map<std::string, bool> _partition_value_is_null;

    std::unordered_map<std::string, uint32_t> _col_name_to_block_idx;

    int64_t _remaining_table_level_row_count = -1;

    cctz::time_zone _ctzz;

};

} // namespace doris