// 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/segment_v2.pb.h>

#include <stddef.h>

#include <stdint.h>

#include <algorithm>

#include <memory> // for unique_ptr

#include <ostream>

#include <string>

#include <unordered_map>

#include <utility>

#include <vector>

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

#include "core/column/column_variant.h"

#include "storage/field.h" // for StorageField

#include "storage/index/ann/ann_index_writer.h"

#include "storage/index/bloom_filter/bloom_filter.h"

#include "storage/index/inverted/inverted_index_writer.h"

#include "storage/segment/common.h"

#include "storage/segment/options.h"

#include "storage/segment/variant/nested_group_provider.h"

#include "storage/segment/variant/variant_statistics.h"

#include "util/bitmap.h" // for BitmapChange

#include "util/slice.h"  // for OwnedSlice

namespace doris {

class BlockCompressionCodec;

class TabletColumn;

class TabletIndex;

struct RowsetWriterContext;

namespace io {

class FileWriter;

}

namespace segment_v2 {

struct ColumnWriterOptions {

    // input and output parameter:

    // - input: column_id/unique_id/type/length/encoding/compression/is_nullable members

    // - output: encoding/indexes/dict_page members

    ColumnMetaPB* meta = nullptr;

    size_t data_page_size = STORAGE_PAGE_SIZE_DEFAULT_VALUE;

    size_t dict_page_size = STORAGE_DICT_PAGE_SIZE_DEFAULT_VALUE;

    // store compressed page only when space saving is above the threshold.

    // space saving = 1 - compressed_size / uncompressed_size

    double compression_min_space_saving = 0.1;

    bool need_zone_map = false;

    bool need_bloom_filter = false;

    bool is_ngram_bf_index = false;

    bool need_inverted_index = false;

    bool need_ann_index = false;

    uint8_t gram_size;

    uint16_t gram_bf_size;

    BloomFilterOptions bf_options;

    std::vector<const TabletIndex*> inverted_indexes;

    IndexFileWriter* index_file_writer = nullptr;

    SegmentFooterPB* footer = nullptr;

    io::FileWriter* file_writer = nullptr;

    CompressionTypePB compression_type = UNKNOWN_COMPRESSION;

    RowsetWriterContext* rowset_ctx = nullptr;

    // For collect segment statistics for compaction

    std::vector<RowsetReaderSharedPtr> input_rs_readers;

    const TabletIndex* ann_index = nullptr;

    EncodingPreference encoding_preference {};

    std::string to_string() const {

        std::stringstream ss;

        ss << std::boolalpha << "meta=" << meta->DebugString()

           << ", data_page_size=" << data_page_size << ", dict_page_size=" << dict_page_size

           << ", compression_min_space_saving = " << compression_min_space_saving

           << ", need_zone_map=" << need_zone_map << ", need_bloom_filter" << need_bloom_filter;

        return ss.str();

    }

};

class EncodingInfo;

class NullBitmapBuilder;

class OrdinalIndexWriter;

class PageBuilder;

class BloomFilterIndexWriter;

class ZoneMapIndexWriter;

class VariantColumnWriterImpl;

class ColumnWriter;

class ColumnWriter {

public:

    static Status create(const ColumnWriterOptions& opts, const TabletColumn* column,

                         io::FileWriter* file_writer, std::unique_ptr<ColumnWriter>* writer);

    static Status create_struct_writer(const ColumnWriterOptions& opts, const TabletColumn* column,

                                       io::FileWriter* file_writer,

                                       std::unique_ptr<ColumnWriter>* writer);

    static Status create_array_writer(const ColumnWriterOptions& opts, const TabletColumn* column,

                                      io::FileWriter* file_writer,

                                      std::unique_ptr<ColumnWriter>* writer);

    static Status create_map_writer(const ColumnWriterOptions& opts, const TabletColumn* column,

                                    io::FileWriter* file_writer,

                                    std::unique_ptr<ColumnWriter>* writer);

    static Status create_variant_writer(const ColumnWriterOptions& opts, const TabletColumn* column,

                                        io::FileWriter* file_writer,

                                        std::unique_ptr<ColumnWriter>* writer);

    static Status create_agg_state_writer(const ColumnWriterOptions& opts,

                                          const TabletColumn* column, io::FileWriter* file_writer,

                                          std::unique_ptr<ColumnWriter>* writer);

    explicit ColumnWriter(std::unique_ptr<StorageField> field, bool is_nullable,

                          ColumnMetaPB* meta);

    virtual ~ColumnWriter() = default;

    virtual Status init() = 0;

    template <typename CellType>

    Status append(const CellType& cell) {

        if (_is_nullable) {

            uint8_t nullmap = 0;

            BitmapChange(&nullmap, 0, cell.is_null());

            return append_nullable(&nullmap, cell.cell_ptr(), 1);

        } else {

            auto* cel_ptr = cell.cell_ptr();

            return append_data((const uint8_t**)&cel_ptr, 1);

        }

    }

    // Now we only support append one by one, we should support append

    // multi rows in one call

    Status append(bool is_null, void* data) {

        uint8_t nullmap = 0;

        BitmapChange(&nullmap, 0, is_null);

        return append_nullable(&nullmap, data, 1);

    }

    Status append(const uint8_t* nullmap, const void* data, size_t num_rows);

    Status append_nullable(const uint8_t* nullmap, const void* data, size_t num_rows);

    // use only in vectorized load

    virtual Status append_nullable(const uint8_t* null_map, const uint8_t** data, size_t num_rows);

    virtual Status append_nulls(size_t num_rows) = 0;

    virtual Status finish_current_page() = 0;

    virtual uint64_t estimate_buffer_size() = 0;

    // finish append data

    virtual Status finish() = 0;

    // write all data into file

    virtual Status write_data() = 0;

    virtual Status write_ordinal_index() = 0;

    virtual Status write_zone_map() = 0;

    virtual Status write_inverted_index() = 0;

    virtual Status write_ann_index() { return Status::OK(); }

    virtual Status write_bloom_filter_index() = 0;

    virtual ordinal_t get_next_rowid() const = 0;

    virtual uint64_t get_raw_data_bytes() const = 0;

    virtual uint64_t get_total_uncompressed_data_pages_bytes() const = 0;

    virtual uint64_t get_total_compressed_data_pages_bytes() const = 0;

    // used for append not null data.

    virtual Status append_data(const uint8_t** ptr, size_t num_rows) = 0;

    bool is_nullable() const { return _is_nullable; }

    StorageField* get_field() const { return _field.get(); }

    ColumnMetaPB* get_column_meta() const { return _column_meta; }

protected:

    DataTypePtr _data_type;

private:

    std::unique_ptr<StorageField> _field;

    bool _is_nullable;

    ColumnMetaPB* _column_meta;

    std::vector<uint8_t> _null_bitmap;

};

class FlushPageCallback {

public:

    virtual ~FlushPageCallback() = default;

    virtual void put_extra_info_in_page(DataPageFooterPB* footer) {}

};

// Encode one column's data into some memory slice.

// Because some columns would be stored in a file, we should wait

// until all columns has been finished, and then data can be written

// to file

class ScalarColumnWriter : public ColumnWriter {

public:

    ScalarColumnWriter(const ColumnWriterOptions& opts, std::unique_ptr<StorageField> field,

                       io::FileWriter* file_writer);

    ~ScalarColumnWriter() override;

    Status init() override;

    Status append_nulls(size_t num_rows) override;

    Status finish_current_page() override;

    uint64_t estimate_buffer_size() override;

    // finish append data

    Status finish() override;

    Status write_data() override;

    Status write_ordinal_index() override;

    Status write_zone_map() override;

    Status write_inverted_index() override;

    Status write_bloom_filter_index() override;

    ordinal_t get_next_rowid() const override { return _next_rowid; }

    uint64_t get_raw_data_bytes() const override { return _raw_data_bytes; }

    uint64_t get_total_uncompressed_data_pages_bytes() const override {

        return _total_uncompressed_data_pages_size;

    }

    uint64_t get_total_compressed_data_pages_bytes() const override {

        return _total_compressed_data_pages_size;

    }

    void register_flush_page_callback(FlushPageCallback* flush_page_callback) {

        _new_page_callback = flush_page_callback;

    }

    Status append_data(const uint8_t** ptr, size_t num_rows) override;

    Status append_nullable(const uint8_t* null_map, const uint8_t** ptr, size_t num_rows) override;

    // used for append not null data. When page is full, will append data not reach num_rows.

    Status append_data_in_current_page(const uint8_t** ptr, size_t* num_written);

    Status append_data_in_current_page(const uint8_t* ptr, size_t* num_written) {

        RETURN_IF_CATCH_EXCEPTION(

                { return _internal_append_data_in_current_page(ptr, num_written); });

    }

    friend class ArrayColumnWriter;

    friend class OffsetColumnWriter;

private:

    Status _internal_append_data_in_current_page(const uint8_t* ptr, size_t* num_written);

private:

    struct NullRun {

        bool is_null;

        uint32_t len;

    };

    std::vector<NullRun> _null_run_buffer;

    std::unique_ptr<PageBuilder> _page_builder;

    std::unique_ptr<NullBitmapBuilder> _null_bitmap_builder;

    ColumnWriterOptions _opts;

    const EncodingInfo* _encoding_info = nullptr;

    ordinal_t _next_rowid = 0;

    // All Pages will be organized into a linked list

    struct Page {

        // the data vector may contain:

        //     1. one OwnedSlice if the page body is compressed

        //     2. one OwnedSlice if the page body is not compressed and doesn't have nullmap

        //     3. two OwnedSlice if the page body is not compressed and has nullmap

        // use vector for easier management for lifetime of OwnedSlice

        std::vector<OwnedSlice> data;

        PageFooterPB footer;

    };

    void _push_back_page(std::unique_ptr<Page> page) {

        for (auto& data_slice : page->data) {

            _data_size += data_slice.slice().size;

        }

        // estimate (page footer + footer size + checksum) took 20 bytes

        _data_size += 20;

        // add page to pages' tail

        _pages.emplace_back(std::move(page));

    }

    Status _write_data_page(Page* page);

private:

    io::FileWriter* _file_writer = nullptr;

    // total size of data page list

    uint64_t _data_size;

    uint64_t _raw_data_bytes {0};

    uint64_t _total_uncompressed_data_pages_size {0};

    uint64_t _total_compressed_data_pages_size {0};

    // cached generated pages,

    std::vector<std::unique_ptr<Page>> _pages;

    ordinal_t _first_rowid = 0;

    BlockCompressionCodec* _compress_codec;

    std::unique_ptr<OrdinalIndexWriter> _ordinal_index_builder;

    std::unique_ptr<ZoneMapIndexWriter> _zone_map_index_builder;

    std::vector<std::unique_ptr<IndexColumnWriter>> _inverted_index_builders;

    std::unique_ptr<BloomFilterIndexWriter> _bloom_filter_index_builder;

    // call before flush data page.

    FlushPageCallback* _new_page_callback = nullptr;

};

// offsetColumnWriter is used column which has offset column, like array, map.

//  column type is only uint64 and should response for whole column value [start, end], end will set

//  in footer.next_array_item_ordinal which in finish_cur_page() callback put_extra_info_in_page()

class OffsetColumnWriter final : public ScalarColumnWriter, FlushPageCallback {

public:

    OffsetColumnWriter(const ColumnWriterOptions& opts, std::unique_ptr<StorageField> field,

                       io::FileWriter* file_writer);

    ~OffsetColumnWriter() override;

    Status init() override;

    Status append_data(const uint8_t** ptr, size_t num_rows) override;

private:

    void put_extra_info_in_page(DataPageFooterPB* footer) override;

    uint64_t _next_offset;

};

class StructColumnWriter final : public ColumnWriter {

public:

    explicit StructColumnWriter(const ColumnWriterOptions& opts,

                                std::unique_ptr<StorageField> field,

                                ScalarColumnWriter* null_writer,

                                std::vector<std::unique_ptr<ColumnWriter>>& sub_column_writers);

    ~StructColumnWriter() override = default;

    Status init() override;

    Status append_nullable(const uint8_t* null_map, const uint8_t** data, size_t num_rows) override;

    Status append_data(const uint8_t** ptr, size_t num_rows) override;

    uint64_t estimate_buffer_size() override;

    Status finish() override;

    Status write_data() override;

    Status write_ordinal_index() override;

    Status append_nulls(size_t num_rows) override;

    Status finish_current_page() override;

    Status write_zone_map() override {

        if (_opts.need_zone_map) {

            return Status::NotSupported("struct not support zone map");

        }

        return Status::OK();

    }

    Status write_inverted_index() override;

    Status write_bloom_filter_index() override {

        if (_opts.need_bloom_filter) {

            return Status::NotSupported("struct not support bloom filter index");

        }

        return Status::OK();

    }

    ordinal_t get_next_rowid() const override { return _sub_column_writers[0]->get_next_rowid(); }

    uint64_t get_raw_data_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_raw_data_bytes);

    }

    uint64_t get_total_uncompressed_data_pages_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_total_uncompressed_data_pages_bytes);

    }

    uint64_t get_total_compressed_data_pages_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_total_compressed_data_pages_bytes);

    }

private:

    template <typename Func>

    uint64_t _get_total_data_pages_bytes(Func func) const {

        uint64_t size = is_nullable() ? std::invoke(func, _null_writer.get()) : 0;

        for (const auto& writer : _sub_column_writers) {

            size += std::invoke(func, writer.get());

        }

        return size;

    }

private:

    size_t _num_sub_column_writers;

    std::unique_ptr<ScalarColumnWriter> _null_writer;

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

    ColumnWriterOptions _opts;

};

class ArrayColumnWriter final : public ColumnWriter {

public:

    explicit ArrayColumnWriter(const ColumnWriterOptions& opts, std::unique_ptr<StorageField> field,

                               OffsetColumnWriter* offset_writer, ScalarColumnWriter* null_writer,

                               std::unique_ptr<ColumnWriter> item_writer);

    ~ArrayColumnWriter() override = default;

    Status init() override;

    Status append_data(const uint8_t** ptr, size_t num_rows) override;

    uint64_t estimate_buffer_size() override;

    Status finish() override;

    Status write_data() override;

    Status write_ordinal_index() override;

    Status append_nulls(size_t num_rows) override;

    Status append_nullable(const uint8_t* null_map, const uint8_t** ptr, size_t num_rows) override;

    Status finish_current_page() override;

    Status write_zone_map() override {

        if (_opts.need_zone_map) {

            return Status::NotSupported("array not support zone map");

        }

        return Status::OK();

    }

    Status write_inverted_index() override;

    Status write_ann_index() override;

    Status write_bloom_filter_index() override {

        if (_opts.need_bloom_filter) {

            return Status::NotSupported("array not support bloom filter index");

        }

        return Status::OK();

    }

    ordinal_t get_next_rowid() const override { return _offset_writer->get_next_rowid(); }

    uint64_t get_raw_data_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_raw_data_bytes);

    }

    uint64_t get_total_uncompressed_data_pages_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_total_uncompressed_data_pages_bytes);

    }

    uint64_t get_total_compressed_data_pages_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_total_compressed_data_pages_bytes);

    }

private:

    template <typename Func>

    uint64_t _get_total_data_pages_bytes(Func func) const {

        uint64_t size = std::invoke(func, _offset_writer.get());

        if (is_nullable()) {

            size += std::invoke(func, _null_writer.get());

        }

        size += std::invoke(func, _item_writer.get());

        return size;

    }

private:

    Status write_null_column(size_t num_rows, bool is_null); // 写入num_rows个null标记

    bool has_empty_items() const { return _item_writer->get_next_rowid() == 0; }

private:

    std::unique_ptr<OffsetColumnWriter> _offset_writer;

    std::unique_ptr<ScalarColumnWriter> _null_writer;

    std::unique_ptr<ColumnWriter> _item_writer;

    std::unique_ptr<IndexColumnWriter> _inverted_index_writer;

    std::unique_ptr<AnnIndexColumnWriter> _ann_index_writer;

    ColumnWriterOptions _opts;

};

class MapColumnWriter final : public ColumnWriter {

public:

    explicit MapColumnWriter(const ColumnWriterOptions& opts, std::unique_ptr<StorageField> field,

                             ScalarColumnWriter* null_writer, OffsetColumnWriter* offsets_writer,

                             std::vector<std::unique_ptr<ColumnWriter>>& _kv_writers);

    ~MapColumnWriter() override = default;

    Status init() override;

    Status append_data(const uint8_t** ptr, size_t num_rows) override;

    Status append_nullable(const uint8_t* null_map, const uint8_t** ptr, size_t num_rows) override;

    uint64_t estimate_buffer_size() override;

    Status finish() override;

    Status write_data() override;

    Status write_ordinal_index() override;

    Status write_inverted_index() override;

    Status append_nulls(size_t num_rows) override;

    Status finish_current_page() override;

    Status write_zone_map() override {

        if (_opts.need_zone_map) {

            return Status::NotSupported("map not support zone map");

        }

        return Status::OK();

    }

    Status write_bloom_filter_index() override {

        if (_opts.need_bloom_filter) {

            return Status::NotSupported("map not support bloom filter index");

        }

        return Status::OK();

    }

    // according key writer to get next rowid

    ordinal_t get_next_rowid() const override { return _offsets_writer->get_next_rowid(); }

    uint64_t get_raw_data_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_raw_data_bytes);

    }

    uint64_t get_total_uncompressed_data_pages_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_total_uncompressed_data_pages_bytes);

    }

    uint64_t get_total_compressed_data_pages_bytes() const override {

        return _get_total_data_pages_bytes(&ColumnWriter::get_total_compressed_data_pages_bytes);

    }

private:

    template <typename Func>

    uint64_t _get_total_data_pages_bytes(Func func) const {

        uint64_t size = std::invoke(func, _offsets_writer.get());

        if (is_nullable()) {

            size += std::invoke(func, _null_writer.get());

        }

        for (const auto& writer : _kv_writers) {

            size += std::invoke(func, writer.get());

        }

        return size;

    }

private:

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

    // we need null writer to make sure a row is null or not

    std::unique_ptr<ScalarColumnWriter> _null_writer;

    std::unique_ptr<OffsetColumnWriter> _offsets_writer;

    std::unique_ptr<IndexColumnWriter> _index_builder;

    ColumnWriterOptions _opts;

};

// used for compaction to write sub variant column

class VariantSubcolumnWriter : public ColumnWriter {

public:

    explicit VariantSubcolumnWriter(const ColumnWriterOptions& opts, const TabletColumn* column,

                                    std::unique_ptr<StorageField> field);

    ~VariantSubcolumnWriter() override = default;

    Status init() override;

    Status append_data(const uint8_t** ptr, size_t num_rows) override;

    uint64_t estimate_buffer_size() override;

    Status finish() override;

    Status write_data() override;

    Status write_ordinal_index() override;

    Status write_zone_map() override;

    Status write_inverted_index() override;

    Status write_bloom_filter_index() override;

    ordinal_t get_next_rowid() const override { return _next_rowid; }

    uint64_t get_raw_data_bytes() const override {

        return 0; // TODO

    }

    uint64_t get_total_uncompressed_data_pages_bytes() const override {

        return 0; // TODO

    }

    uint64_t get_total_compressed_data_pages_bytes() const override {

        return 0; // TODO

    }

    Status append_nulls(size_t num_rows) override {

        return Status::NotSupported("variant writer can not append_nulls");

    }

    Status append_nullable(const uint8_t* null_map, const uint8_t** ptr, size_t num_rows) override;

    Status finish_current_page() override {

        return Status::NotSupported("variant writer has no data, can not finish_current_page");

    }

    size_t get_non_null_size() const { return none_null_size; }

    Status finalize();

private:

    bool is_finalized() const;

    bool _is_finalized = false;

    ordinal_t _next_rowid = 0;

    size_t none_null_size = 0;

    ColumnVariant::MutablePtr _column;

    const TabletColumn* _tablet_column = nullptr;

    ColumnWriterOptions _opts;

    std::unique_ptr<ColumnWriter> _writer;

    TabletIndexes _indexes;

    std::unique_ptr<NestedGroupWriteProvider> _nested_group_provider;

    VariantStatistics _statistics;

};

class VariantColumnWriter : public ColumnWriter {

public:

    explicit VariantColumnWriter(const ColumnWriterOptions& opts, const TabletColumn* column,

                                 std::unique_ptr<StorageField> field);

    ~VariantColumnWriter() override = default;

    Status init() override;

    Status append_data(const uint8_t** ptr, size_t num_rows) override;

    uint64_t estimate_buffer_size() override;

    Status finish() override;

    Status write_data() override;

    Status write_ordinal_index() override;

    Status write_zone_map() override;

    Status write_inverted_index() override;

    Status write_bloom_filter_index() override;

    ordinal_t get_next_rowid() const override { return _next_rowid; }

    uint64_t get_raw_data_bytes() const override {

        return 0; // TODO

    }

    uint64_t get_total_uncompressed_data_pages_bytes() const override {

        return 0; // TODO

    }

    uint64_t get_total_compressed_data_pages_bytes() const override {

        return 0; // TODO

    }

    Status append_nulls(size_t num_rows) override {

        return Status::NotSupported("variant writer can not append_nulls");

    }

    Status append_nullable(const uint8_t* null_map, const uint8_t** ptr, size_t num_rows) override;

    Status finish_current_page() override {

        return Status::NotSupported("variant writer has no data, can not finish_current_page");

    }

private:

    std::unique_ptr<VariantColumnWriterImpl> _impl;

    ordinal_t _next_rowid = 0;

};

} // namespace segment_v2

} // namespace doris