// Licensed to the Apache Software Foundation (ASF) under one

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// 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.

#include "util/jsonb/serialize.h"

#include <assert.h>

#include <algorithm>

#include <limits>

#include <memory>

#include <unordered_set>

#include <vector>

#include "core/arena.h"

#include "core/block/column_with_type_and_name.h"

#include "core/block/columns_with_type_and_name.h"

#include "core/column/column.h"

#include "core/column/column_string.h"

#include "core/data_type/data_type.h"

#include "core/data_type/primitive_type.h"

#include "core/data_type_serde/data_type_serde.h"

#include "core/string_ref.h"

#include "core/value/jsonb_value.h"

#include "runtime/descriptors.h"

#include "storage/tablet/tablet_schema.h"

#include "util/defer_op.h"

#include "util/jsonb_document.h"

#include "util/jsonb_stream.h"

#include "util/jsonb_writer.h"

namespace doris {

void JsonbSerializeUtil::block_to_jsonb(const TabletSchema& schema, const Block& block,

                                        ColumnString& dst, int num_cols,

                                        const DataTypeSerDeSPtrs& serdes,

                                        const std::unordered_set<int32_t>& row_store_cids) {

    block_to_jsonb(schema, block, dst, num_cols, serdes, row_store_cids, 0, block.rows());

}

void JsonbSerializeUtil::block_to_jsonb(const TabletSchema& schema, const Block& block,

                                        ColumnString& dst, int num_cols,

                                        const DataTypeSerDeSPtrs& serdes,

                                        const std::unordered_set<int32_t>& row_store_cids,

                                        size_t row_pos, size_t num_rows) {

    static_cast<void>(block_to_jsonb(schema, block, dst, num_cols, serdes, row_store_cids, row_pos,

                                     num_rows, std::numeric_limits<size_t>::max()));

}

size_t JsonbSerializeUtil::block_to_jsonb(const TabletSchema& schema, const Block& block,

                                          ColumnString& dst, int num_cols,

                                          const DataTypeSerDeSPtrs& serdes,

                                          const std::unordered_set<int32_t>& row_store_cids,

                                          size_t row_pos, size_t num_rows, size_t max_bytes) {

    Arena arena;

    assert(num_cols <= block.columns());

    assert(row_pos + num_rows <= block.rows());

    DataTypeSerDe::FormatOptions options;

    auto tz = cctz::utc_time_zone();

    options.timezone = &tz;

    size_t written_rows = 0;

    for (size_t i = row_pos; i < row_pos + num_rows; ++i) {

        JsonbWriterT<JsonbOutStream> jsonb_writer;

        jsonb_writer.writeStartObject();

        for (int j = 0; j < num_cols; ++j) {

            const auto& column = block.get_by_position(j).column;

            const auto& tablet_column = *schema.columns()[j];

            // ignore row store columns

            if (tablet_column.is_row_store_column()) {

                continue;

            }

            // TODO improve performance for checking column in group

            if (row_store_cids.empty() || row_store_cids.contains(tablet_column.unique_id())) {

                serdes[j]->write_one_cell_to_jsonb(*column, jsonb_writer, arena,

                                                   tablet_column.unique_id(), i, options);

            }

        }

        jsonb_writer.writeEndObject();

        dst.insert_data(jsonb_writer.getOutput()->getBuffer(), jsonb_writer.getOutput()->getSize());

        ++written_rows;

        if (dst.byte_size() >= max_bytes) {

            break;

        }

    }

    return written_rows;

}

// batch rows

Status JsonbSerializeUtil::jsonb_to_block(

        const DataTypeSerDeSPtrs& serdes, const ColumnString& jsonb_column,

        const std::unordered_map<uint32_t, uint32_t>& col_id_to_idx, Block& dst,

        const std::vector<std::string>& default_values,

        const std::unordered_set<int>& include_cids) {

    auto dst_columns_guard = dst.mutate_columns_scoped();

    MutableColumns& dst_columns = dst_columns_guard.mutable_columns();

    for (int i = 0; i < jsonb_column.size(); ++i) {

        StringRef jsonb_data = jsonb_column.get_data_at(i);

        RETURN_IF_ERROR(jsonb_to_columns(serdes, jsonb_data.data, jsonb_data.size, col_id_to_idx,

                                         dst_columns, default_values, include_cids));

    }

    return Status::OK();

}

Status JsonbSerializeUtil::jsonb_to_columns(

        const DataTypeSerDeSPtrs& serdes, const char* data, size_t size,

        const std::unordered_map<uint32_t, uint32_t>& col_id_to_idx, MutableColumns& dst_columns,

        const std::vector<std::string>& default_values,

        const std::unordered_set<int>& include_cids) {

    const JsonbDocument* pdoc = nullptr;

    RETURN_IF_ERROR(JsonbDocument::checkAndCreateDocument(data, size, &pdoc));

    const JsonbDocument& doc = *pdoc;

    DCHECK(!dst_columns.empty());

    size_t num_rows = dst_columns[0]->size();

    size_t filled_columns = 0;

    for (auto it = doc->begin(); it != doc->end(); ++it) {

        auto col_it = col_id_to_idx.find(it->getKeyId());

        if (col_it != col_id_to_idx.end() &&

            (include_cids.empty() || include_cids.contains(it->getKeyId()))) {

            auto& dst_column = dst_columns[col_it->second];

            serdes[col_it->second]->read_one_cell_from_jsonb(*dst_column, it->value());

            ++filled_columns;

        }

    }

    if (filled_columns >= dst_columns.size()) {

        return Status::OK();

    }

    auto fill_column = [&](size_t pos, size_t old_num_rows) {

        auto& dst_column = dst_columns[pos];

        if (dst_column->size() < old_num_rows + 1) {

            DCHECK(dst_column->size() == old_num_rows);

            Status st = Status::OK();

            if (default_values[pos].empty()) {

                dst_column->insert_default();

            } else {

                Slice value(default_values[pos].data(), default_values[pos].size());

                DataTypeSerDe::FormatOptions opt;

                opt.converted_from_string = true;

                st = serdes[pos]->deserialize_one_cell_from_json(*dst_column, value, opt);

            }

            RETURN_IF_ERROR(st);

            DCHECK(dst_column->size() == num_rows + 1);

            return Status::OK();

        }

        DCHECK(dst_column->size() == num_rows + 1);

        return Status::OK();

    };

    // fill missing column

    if (!include_cids.empty()) {

        for (auto cid : include_cids) {

            auto col_it = col_id_to_idx.find(cid);

            if (col_it == col_id_to_idx.end()) {

                continue;

            }

            RETURN_IF_ERROR(fill_column(static_cast<size_t>(col_it->second), num_rows));

        }

    } else {

        for (size_t i = 0; i < dst_columns.size(); ++i) {

            RETURN_IF_ERROR(fill_column(i, num_rows));

        }

    }

    return Status::OK();

}

// single row

Status JsonbSerializeUtil::jsonb_to_block(

        const DataTypeSerDeSPtrs& serdes, const char* data, size_t size,

        const std::unordered_map<uint32_t, uint32_t>& col_id_to_idx, Block& dst,

        const std::vector<std::string>& default_values,

        const std::unordered_set<int>& include_cids) {

    auto dst_columns_guard = dst.mutate_columns_scoped();

    MutableColumns& dst_columns = dst_columns_guard.mutable_columns();

    return jsonb_to_columns(serdes, data, size, col_id_to_idx, dst_columns, default_values,

                            include_cids);

}

} // namespace doris