// 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 <butil/macros.h>

#include <gen_cpp/olap_file.pb.h>

#include <gen_cpp/segment_v2.pb.h>

#include <stddef.h>

#include <cstdint>

#include <map>

#include <memory> // unique_ptr

#include <string>

#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;

// TODO(lingbin): Should be a conf that can be dynamically adjusted, or a member in the context

const uint32_t MAX_SEGMENT_SIZE = static_cast<uint32_t>(OLAP_MAX_COLUMN_SEGMENT_FILE_SIZE *

                                                        OLAP_COLUMN_FILE_SEGMENT_SIZE_SCALE);

class DataDir;

class MemTracker;

class ShortKeyIndexBuilder;

class PrimaryKeyIndexBuilder;

class KeyCoder;

struct RowsetWriterContext;

namespace io {

class FileWriter;

} // namespace io

namespace segment_v2 {

extern const char* k_segment_magic;

extern const uint32_t k_segment_magic_length;

class VariantStatsCaculator;

struct SegmentWriterOptions {

    uint32_t num_rows_per_block = 1024;

    uint32_t max_rows_per_segment = UINT32_MAX;

    bool enable_unique_key_merge_on_write = false;

    CompressionTypePB compression_type = UNKNOWN_COMPRESSION;

    RowsetWriterContext* rowset_ctx = nullptr;

    DataWriteType write_type = DataWriteType::TYPE_DEFAULT;

    std::shared_ptr<MowContext> mow_ctx;

};

using TabletSharedPtr = std::shared_ptr<Tablet>;

class SegmentWriter {

public:

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

                           TabletSchemaSPtr tablet_schema, BaseTabletSPtr tablet, DataDir* data_dir,

                           const SegmentWriterOptions& opts, IndexFileWriter* inverted_file_writer);

    virtual ~SegmentWriter();

    virtual Status init();

    // for vertical compaction

    virtual Status init(const std::vector<uint32_t>& col_ids, bool has_key);

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

    int64_t max_row_to_add(size_t row_avg_size_in_bytes);

    uint64_t estimate_segment_size();

    uint32_t num_rows_written() const { return _num_rows_written; }

    uint32_t row_count() const { return _row_count; }

    Status finalize(uint64_t* segment_file_size, uint64_t* index_size,

                    SegmentIndexFileCacheInfo* index_file_cache_info = nullptr);

    uint32_t get_segment_id() const { return _segment_id; }

    Status finalize_columns_data();

    Status finalize_columns_index(uint64_t* index_size);

    Status finalize_footer(uint64_t* segment_file_size,

                           SegmentIndexFileCacheInfo* index_file_cache_info = nullptr);

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

                          const ColumnWriterOptions& opts);

    Slice min_encoded_key();

    Slice max_encoded_key();

    bool is_unique_key() { return _tablet_schema->keys_type() == UNIQUE_KEYS; }

    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();

    }

    uint64_t primary_keys_size() const { return _primary_keys_size; }

private:

    friend class TestSegmentWriter;

    DISALLOW_COPY_AND_ASSIGN(SegmentWriter);

    Status _create_column_writer(uint32_t cid, const TabletColumn& column,

                                 const TabletSchemaSPtr& schema);

    Status _create_writers(const TabletSchemaSPtr& tablet_schema,

                           const std::vector<uint32_t>& col_ids);

    Status _write_data();

    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 _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);

    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();

    }

protected:

    // Build key index for derived writers that override append_block.

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

                           IOlapColumnDataAccessor* seq_column, size_t num_rows);

    uint32_t _segment_id;

    TabletSchemaSPtr _tablet_schema;

    BaseTabletSPtr _tablet;

    DataDir* _data_dir = nullptr;

    SegmentWriterOptions _opts;

    // Not owned. owned by RowsetWriter or SegmentFlusher

    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;

    std::vector<uint32_t> _column_ids;

    bool _has_key = true;

    // _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::shared_ptr<MowContext> _mow_context;

    std::vector<std::string> _primary_keys;

    uint64_t _primary_keys_size = 0;

    // variant statistics calculator for efficient stats collection

    std::unique_ptr<VariantStatsCaculator> _variant_stats_calculator;

};

} // namespace segment_v2

} // namespace doris