// 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