// 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 <gen_cpp/olap_file.pb.h>

#include <gen_cpp/segment_v2.pb.h>

#include <cstddef>

#include <cstdint>

#include <map>

#include <memory> // unique_ptr

#include <string>

#include <unordered_set>

#include <utility>

#include <vector>

#include "common/status.h" // Status

#include "storage/index/index_file_writer.h"

#include "storage/key/row_key_encoder.h"

#include "storage/olap_define.h"

#include "storage/segment/column_writer.h"

#include "storage/segment/segment_index_file_cache_loader.h"

#include "storage/tablet/tablet.h"

#include "storage/tablet/tablet_schema.h"

#include "util/faststring.h"

#include "util/slice.h"

namespace doris {

class Block;

class IOlapColumnDataAccessor;

class OlapBlockDataConvertor;

class DataDir;

class MemTracker;

class ShortKeyIndexBuilder;

class PrimaryKeyIndexBuilder;

class KeyCoder;

struct RowsetWriterContext;

namespace io {

class FileWriter;

class FileSystem;

} // namespace io

namespace segment_v2 {

class IndexFileWriter;

struct VerticalSegmentWriterOptions {

    uint32_t num_rows_per_block = 1024;

    bool enable_unique_key_merge_on_write = false;

    CompressionTypePB compression_type = UNKNOWN_COMPRESSION;

    RowsetWriterContext* rowset_ctx = nullptr;

    DataWriteType write_type = DataWriteType::TYPE_DEFAULT;

};

class DerivedColumnGenerator;

// Matches block_transform.h: at most one derived column (the row-store column)

// for each flush, held as a {cid, generator} pair; null generator means none.

using DerivedColumn = std::pair<uint32_t, std::shared_ptr<const DerivedColumnGenerator>>;

struct RowsInBlock {

    const Block* block;

    size_t row_pos;

    size_t num_rows;

};

class VerticalSegmentWriter {

public:

    explicit VerticalSegmentWriter(io::FileWriter* file_writer, uint32_t segment_id,

                                   TabletSchemaSPtr tablet_schema, BaseTabletSPtr tablet,

                                   DataDir* data_dir, const VerticalSegmentWriterOptions& opts,

                                   IndexFileWriter* index_file_writer);

    ~VerticalSegmentWriter();

    VerticalSegmentWriter(const VerticalSegmentWriter&) = delete;

    const VerticalSegmentWriter& operator=(const VerticalSegmentWriter&) = delete;

    Status init();

    // Add one block to batch, memory is owned by the caller.

    // The batched blocks will be flushed in write_batch.

    // Once write_batch is called, no more blocks shoud be added.

    Status batch_block(const Block* block, size_t row_pos, size_t num_rows);

    Status write_batch();

    void set_derived_column(DerivedColumn derived_column) {

        _derived_column = std::move(derived_column);

    }

    [[nodiscard]] std::string data_dir_path() const {

        return _data_dir == nullptr ? "" : _data_dir->path();

    }

    [[nodiscard]] uint32_t num_rows_written() const { return _num_rows_written; }

    [[nodiscard]] uint32_t row_count() const { return _row_count; }

    [[nodiscard]] uint32_t segment_id() const { return _segment_id; }

    Status finalize(uint64_t* segment_file_size, uint64_t* index_size,

                    SegmentIndexFileCacheInfo* index_file_cache_info = nullptr);

    Status finalize_columns_index(uint64_t* index_size);

    Status finalize_footer(uint64_t* segment_file_size,

                           SegmentIndexFileCacheInfo* index_file_cache_info = nullptr);

    Slice min_encoded_key();

    Slice max_encoded_key();

    void clear();

    Status close_inverted_index(int64_t* inverted_index_file_size) {

        // no inverted index

        if (_index_file_writer == nullptr) {

            *inverted_index_file_size = 0;

            return Status::OK();

        }

        RETURN_IF_ERROR(_index_file_writer->begin_close());

        *inverted_index_file_size = _index_file_writer->get_index_file_total_size();

        return Status::OK();

    }

private:

    void _init_column_meta(ColumnMetaPB* meta, uint32_t column_id, const TabletColumn& column,

                           const ColumnWriterOptions& opts);

    Status _create_column_writer(uint32_t cid, const TabletColumn& column,

                                 const TabletSchemaSPtr& schema);

    uint64_t _estimated_remaining_size();

    Status _write_ordinal_index();

    Status _write_zone_map();

    Status _write_inverted_index();

    Status _write_ann_index();

    Status _write_bloom_filter_index();

    Status _write_short_key_index();

    Status _write_primary_key_index();

    Status _write_footer();

    Status _write_raw_data(const std::vector<Slice>& slices);

    void _set_min_max_key(const Slice& key);

    void _set_min_key(const Slice& key);

    void _set_max_key(const Slice& key);

    Status _append_generated_column(const DerivedColumnGenerator& generator, const Block& block,

                                    size_t row_pos, size_t num_rows, uint32_t cid);

    Status _generate_key_index(RowsInBlock& data,

                               std::vector<IOlapColumnDataAccessor*>& key_columns,

                               IOlapColumnDataAccessor* seq_column,

                               std::map<uint32_t, IOlapColumnDataAccessor*>& cid_to_column);

    Status _generate_primary_key_index(

            const std::vector<IOlapColumnDataAccessor*>& primary_key_columns,

            IOlapColumnDataAccessor* seq_column, size_t num_rows, bool need_sort);

    Status _generate_short_key_index(std::vector<IOlapColumnDataAccessor*>& key_columns,

                                     size_t num_rows, const std::vector<size_t>& short_key_pos);

    Status _check_column_writer_disk_capacity(size_t cid);

    Status _finalize_column_writer_and_update_meta(size_t cid);

    bool _is_mow() {

        return _tablet_schema->keys_type() == UNIQUE_KEYS && _opts.enable_unique_key_merge_on_write;

    }

    bool _is_mow_with_cluster_key() {

        return _is_mow() && !_tablet_schema->cluster_key_uids().empty();

    }

private:

    uint32_t _segment_id;

    TabletSchemaSPtr _tablet_schema;

    BaseTabletSPtr _tablet;

    DataDir* _data_dir = nullptr;

    VerticalSegmentWriterOptions _opts;

    // Not owned. owned by RowsetWriter

    io::FileWriter* _file_writer = nullptr;

    // Not owned. owned by RowsetWriter or SegmentFlusher

    IndexFileWriter* _index_file_writer = nullptr;

    SegmentFooterPB _footer;

    SegmentIndexFileCacheInfo _index_file_cache_info;

    size_t _num_short_key_columns;

    std::unique_ptr<ShortKeyIndexBuilder> _short_key_index_builder;

    std::unique_ptr<PrimaryKeyIndexBuilder> _primary_key_index_builder;

    std::vector<std::unique_ptr<ColumnWriter>> _column_writers;

    std::unique_ptr<MemTracker> _mem_tracker;

    std::unique_ptr<OlapBlockDataConvertor> _olap_data_convertor;

    // used for building short key index or primary key index during vectorized write.

    // NOTE: must stay declared after _tablet_schema and _opts, the constructor

    // init list reads both through _is_mow().

    RowKeyEncoder _key_encoder;

    size_t _short_key_row_pos = 0;

    // _num_rows_written means row count already written in this current column group

    uint32_t _num_rows_written = 0;

    // _row_count means total row count of this segment

    // In vertical compaction row count is recorded when key columns group finish

    //  and _num_rows_written will be updated in value column group

    uint32_t _row_count = 0;

    bool _is_first_row = true;

    faststring _min_key;

    faststring _max_key;

    std::vector<RowsInBlock> _batched_blocks;

    // the derived column the transform chain hands off to this writer's bounded pump

    DerivedColumn _derived_column;

};

} // namespace segment_v2

} // namespace doris