// 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.

#include "exprs/function/function_multi_match.h"

#include <glog/logging.h>

#include <memory>

#include <roaring/roaring.hh>

#include <string>

#include <vector>

#include "core/column/column.h"

#include "exprs/function/simple_function_factory.h"

#include "exprs/vslot_ref.h"

#include "io/fs/file_reader.h"

#include "storage/index/inverted/query/phrase_prefix_query.h"

#include "storage/segment/segment_iterator.h"

namespace doris {

Status FunctionMultiMatch::execute_impl(FunctionContext* /*context*/, Block& block,

                                        const ColumnNumbers& arguments, uint32_t result,

                                        size_t /*input_rows_count*/) const {

    return Status::RuntimeError("only inverted index queries are supported");

}

InvertedIndexQueryType get_query_type(const std::string& query_type) {

    if (query_type == "any") {

        return InvertedIndexQueryType::MATCH_ANY_QUERY;

    } else if (query_type == "all") {

        return InvertedIndexQueryType::MATCH_ALL_QUERY;

    } else if (query_type == "phrase") {

        return InvertedIndexQueryType::MATCH_PHRASE_QUERY;

    } else if (query_type == "phrase_prefix") {

        return InvertedIndexQueryType::MATCH_PHRASE_PREFIX_QUERY;

    } else {

        return InvertedIndexQueryType::UNKNOWN_QUERY;

    }

}

Status FunctionMultiMatch::evaluate_inverted_index(

        const ColumnsWithTypeAndName& arguments,

        const std::vector<IndexFieldNameAndTypePair>& data_type_with_names,

        std::vector<segment_v2::IndexIterator*> iterators, uint32_t num_rows,

        const InvertedIndexAnalyzerCtx* analyzer_ctx,

        segment_v2::InvertedIndexResultBitmap& bitmap_result) const {

    DCHECK(arguments.size() == 2);

    std::shared_ptr<roaring::Roaring> roaring = std::make_shared<roaring::Roaring>();

    std::shared_ptr<roaring::Roaring> null_bitmap = std::make_shared<roaring::Roaring>();

    // type

    auto query_type_value = arguments[0].column->get_data_at(0);

    auto query_type = get_query_type(query_type_value.to_string());

    if (query_type == InvertedIndexQueryType::UNKNOWN_QUERY) {

        return Status::RuntimeError(

                "parameter query type incorrect for function multi_match: query_type = {}",

                query_type);

    }

    // query

    auto query_str_ref = arguments[1].column->get_data_at(0);

    auto param_type = arguments[1].type->get_primitive_type();

    if (!is_string_type(param_type)) {

        return Status::Error<ErrorCode::INDEX_INVALID_PARAMETERS>(

                "arguments for multi_match must be string");

    }

    // Must convert StringRef to std::string because downstream readers

    // (e.g. FullTextIndexReader::query) reinterpret_cast query_value as std::string*.

    std::string query_str(query_str_ref.data, query_str_ref.size);

    // search

    InvertedIndexParam param;

    param.query_value = &query_str;

    param.query_type = query_type;

    param.num_rows = num_rows;

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

        auto column_name = data_type_with_names[i].first;

        auto* iter = iterators[i];

        if (iter == nullptr) {

            std::string error_msg = "Inverted index iterator is null for column '" + column_name +

                                    "' during multi_match execution";

            return Status::Error<ErrorCode::INVERTED_INDEX_CLUCENE_ERROR>(error_msg);

        }

        param.column_name = column_name;

        param.column_type = data_type_with_names[i].second;

        param.roaring = std::make_shared<roaring::Roaring>();

        param.analyzer_ctx = analyzer_ctx;

        RETURN_IF_ERROR(iter->read_from_index(segment_v2::IndexParam {&param}));

        *roaring |= *param.roaring;

    }

    segment_v2::InvertedIndexResultBitmap result(roaring, null_bitmap);

    bitmap_result = result;

    return Status::OK();

}

void register_function_multi_match(SimpleFunctionFactory& factory) {

    factory.register_function<FunctionMultiMatch>();

}

} // namespace doris