// 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 "vec/functions/match.h"

#include <hs/hs.h>

#include "olap/rowset/segment_v2/inverted_index/analyzer/analyzer.h"
#include "runtime/query_context.h"
#include "runtime/runtime_state.h"
#include "util/debug_points.h"

namespace doris::vectorized {
#include "common/compile_check_begin.h"
Status FunctionMatchBase::evaluate_inverted_index(
        const ColumnsWithTypeAndName& arguments,
        const std::vector<vectorized::IndexFieldNameAndTypePair>& data_type_with_names,
        std::vector<segment_v2::IndexIterator*> iterators, uint32_t num_rows,
        segment_v2::InvertedIndexResultBitmap& bitmap_result) const {
    DCHECK(arguments.size() == 1);
    DCHECK(data_type_with_names.size() == 1);
    DCHECK(iterators.size() == 1);
    auto* iter = iterators[0];
    auto data_type_with_name = data_type_with_names[0];
    if (iter == nullptr) {
        return Status::OK();
    }
    const std::string& function_name = get_name();

    if (function_name == MATCH_PHRASE_FUNCTION || function_name == MATCH_PHRASE_PREFIX_FUNCTION ||
        function_name == MATCH_PHRASE_EDGE_FUNCTION) {
        if (iter->get_reader()->is_fulltext_index() && !iter->get_reader()->is_support_phrase()) {
            return Status::Error<ErrorCode::INDEX_INVALID_PARAMETERS>(
                    "phrase queries require setting support_phrase = true");
        }
    }
    Field param_value;
    arguments[0].column->get(0, param_value);
    if (param_value.is_null()) {
        // if query value is null, skip evaluate inverted index
        return Status::OK();
    }
    auto param_type = arguments[0].type->get_primitive_type();
    if (!is_string_type(param_type)) {
        return Status::Error<ErrorCode::INDEX_INVALID_PARAMETERS>(
                "arguments for match must be string");
    }
    std::unique_ptr<InvertedIndexQueryParamFactory> query_param = nullptr;
    RETURN_IF_ERROR(InvertedIndexQueryParamFactory::create_query_value(param_type, &param_value,
                                                                       query_param));

    InvertedIndexParam param;
    param.column_name = data_type_with_name.first;
    param.query_value = query_param->get_value();
    param.query_type = get_query_type_from_fn_name();
    param.num_rows = num_rows;
    param.roaring = std::make_shared<roaring::Roaring>();
    if (is_string_type(param_type)) {
        RETURN_IF_ERROR(iter->read_from_index(&param));
    } else {
        return Status::Error<ErrorCode::INDEX_INVALID_PARAMETERS>(
                "invalid params type for FunctionMatchBase::evaluate_inverted_index {}",
                param_type);
    }
    std::shared_ptr<roaring::Roaring> null_bitmap = std::make_shared<roaring::Roaring>();
    if (iter->has_null()) {
        segment_v2::InvertedIndexQueryCacheHandle null_bitmap_cache_handle;
        RETURN_IF_ERROR(iter->read_null_bitmap(&null_bitmap_cache_handle));
        null_bitmap = null_bitmap_cache_handle.get_bitmap();
    }
    segment_v2::InvertedIndexResultBitmap result(param.roaring, null_bitmap);
    bitmap_result = result;
    bitmap_result.mask_out_null();

    return Status::OK();
}
Status FunctionMatchBase::execute_impl(FunctionContext* context, Block& block,
                                       const ColumnNumbers& arguments, uint32_t result,
                                       size_t input_rows_count) const {
    ColumnPtr& column_ptr = block.get_by_position(arguments[1]).column;
    DataTypePtr& type_ptr = block.get_by_position(arguments[1]).type;
    auto match_query_str = type_ptr->to_string(*column_ptr, 0);
    std::string column_name = block.get_by_position(arguments[0]).name;
    VLOG_DEBUG << "begin to execute match directly, column_name=" << column_name
               << ", match_query_str=" << match_query_str;
    auto* inverted_index_ctx = reinterpret_cast<InvertedIndexCtx*>(
            context->get_function_state(FunctionContext::THREAD_LOCAL));
    if (inverted_index_ctx == nullptr) {
        inverted_index_ctx = reinterpret_cast<InvertedIndexCtx*>(
                context->get_function_state(FunctionContext::FRAGMENT_LOCAL));
    }

    if (!inverted_index_ctx->custom_analyzer.empty()) {
        return Status::NotSupported(
                "Custom analyzer is not supported for unindexed MATCH operations.");
    }

    const ColumnPtr source_col =
            block.get_by_position(arguments[0]).column->convert_to_full_column_if_const();
    const auto* values = check_and_get_column<ColumnString>(source_col.get());
    const ColumnArray* array_col = nullptr;
    if (is_column<vectorized::ColumnArray>(source_col.get())) {
        array_col = check_and_get_column<ColumnArray>(source_col.get());
        if (array_col && !array_col->get_data().is_column_string()) {
            return Status::NotSupported(fmt::format(
                    "unsupported nested array of type {} for function {}",
                    is_column_nullable(array_col->get_data()) ? array_col->get_data().get_name()
                                                              : array_col->get_data().get_name(),
                    get_name()));
        }

        if (is_column_nullable(array_col->get_data())) {
            const auto& array_nested_null_column =
                    reinterpret_cast<const ColumnNullable&>(array_col->get_data());
            values = check_and_get_column<ColumnString>(
                    *(array_nested_null_column.get_nested_column_ptr()));
        } else {
            // array column element is always set Nullable for now.
            values = check_and_get_column<ColumnString>(*(array_col->get_data_ptr()));
        }
    } else if (const auto* nullable = check_and_get_column<ColumnNullable>(source_col.get())) {
        values = check_and_get_column<ColumnString>(*nullable->get_nested_column_ptr());
    }

    if (!values) {
        LOG(WARNING) << "Illegal column " << source_col->get_name();
        return Status::InternalError("Not supported input column types");
    }
    // result column
    auto res = ColumnUInt8::create();
    ColumnUInt8::Container& vec_res = res->get_data();
    // set default value to 0, and match functions only need to set 1/true
    vec_res.resize_fill(input_rows_count);
    RETURN_IF_ERROR(execute_match(context, column_name, match_query_str, input_rows_count, values,
                                  inverted_index_ctx,
                                  (array_col ? &(array_col->get_offsets()) : nullptr), vec_res));
    block.replace_by_position(result, std::move(res));

    return Status::OK();
}

inline doris::segment_v2::InvertedIndexQueryType FunctionMatchBase::get_query_type_from_fn_name()
        const {
    std::string fn_name = get_name();
    if (fn_name == MATCH_ANY_FUNCTION) {
        return doris::segment_v2::InvertedIndexQueryType::MATCH_ANY_QUERY;
    } else if (fn_name == MATCH_ALL_FUNCTION) {
        return doris::segment_v2::InvertedIndexQueryType::MATCH_ALL_QUERY;
    } else if (fn_name == MATCH_PHRASE_FUNCTION) {
        return doris::segment_v2::InvertedIndexQueryType::MATCH_PHRASE_QUERY;
    } else if (fn_name == MATCH_PHRASE_PREFIX_FUNCTION) {
        return doris::segment_v2::InvertedIndexQueryType::MATCH_PHRASE_PREFIX_QUERY;
    } else if (fn_name == MATCH_PHRASE_REGEXP_FUNCTION) {
        return doris::segment_v2::InvertedIndexQueryType::MATCH_REGEXP_QUERY;
    } else if (fn_name == MATCH_PHRASE_EDGE_FUNCTION) {
        return doris::segment_v2::InvertedIndexQueryType::MATCH_PHRASE_EDGE_QUERY;
    }
    return doris::segment_v2::InvertedIndexQueryType::UNKNOWN_QUERY;
}

std::vector<TermInfo> FunctionMatchBase::analyse_query_str_token(
        InvertedIndexCtx* inverted_index_ctx, const std::string& match_query_str,
        const std::string& column_name) const {
    VLOG_DEBUG << "begin to run " << get_name() << ", parser_type: "
               << inverted_index_parser_type_to_string(inverted_index_ctx->parser_type);
    std::vector<TermInfo> query_tokens;
    if (inverted_index_ctx == nullptr) {
        return query_tokens;
    }
    if (inverted_index_ctx->parser_type == InvertedIndexParserType::PARSER_NONE) {
        query_tokens.emplace_back(match_query_str);
        return query_tokens;
    }
    auto reader = doris::segment_v2::inverted_index::InvertedIndexAnalyzer::create_reader(
            inverted_index_ctx->char_filter_map);
    reader->init(match_query_str.data(), (int)match_query_str.size(), true);
    query_tokens = doris::segment_v2::inverted_index::InvertedIndexAnalyzer::get_analyse_result(
            reader.get(), inverted_index_ctx->analyzer);
    return query_tokens;
}

inline std::vector<TermInfo> FunctionMatchBase::analyse_data_token(
        const std::string& column_name, InvertedIndexCtx* inverted_index_ctx,
        const ColumnString* string_col, int32_t current_block_row_idx,
        const ColumnArray::Offsets64* array_offsets, int32_t& current_src_array_offset) const {
    std::vector<TermInfo> data_tokens;
    if (array_offsets) {
        for (auto next_src_array_offset = (*array_offsets)[current_block_row_idx];
             current_src_array_offset < next_src_array_offset; ++current_src_array_offset) {
            const auto& str_ref = string_col->get_data_at(current_src_array_offset);
            if (inverted_index_ctx->parser_type == InvertedIndexParserType::PARSER_NONE) {
                data_tokens.emplace_back(str_ref.to_string());
                continue;
            }
            auto reader = doris::segment_v2::inverted_index::InvertedIndexAnalyzer::create_reader(
                    inverted_index_ctx->char_filter_map);
            reader->init(str_ref.data, (int)str_ref.size, true);

            data_tokens =
                    doris::segment_v2::inverted_index::InvertedIndexAnalyzer::get_analyse_result(
                            reader.get(), inverted_index_ctx->analyzer);
        }
    } else {
        const auto& str_ref = string_col->get_data_at(current_block_row_idx);
        if (inverted_index_ctx->parser_type == InvertedIndexParserType::PARSER_NONE) {
            data_tokens.emplace_back(str_ref.to_string());
        } else {
            auto reader = doris::segment_v2::inverted_index::InvertedIndexAnalyzer::create_reader(
                    inverted_index_ctx->char_filter_map);
            reader->init(str_ref.data, (int)str_ref.size, true);
            data_tokens =
                    doris::segment_v2::inverted_index::InvertedIndexAnalyzer::get_analyse_result(
                            reader.get(), inverted_index_ctx->analyzer);
        }
    }
    return data_tokens;
}

Status FunctionMatchBase::check(FunctionContext* context, const std::string& function_name) const {
    if (!context->state()->query_options().enable_match_without_inverted_index) {
        return Status::Error<ErrorCode::INVERTED_INDEX_NOT_SUPPORTED>(
                "{} not support execute_match", function_name);
    }

    DBUG_EXECUTE_IF("match.invert_index_not_support_execute_match", {
        return Status::Error<ErrorCode::INVERTED_INDEX_NOT_SUPPORTED>(
                "debug point: {} not support execute_match", function_name);
    });

    return Status::OK();
}

Status FunctionMatchAny::execute_match(FunctionContext* context, const std::string& column_name,
                                       const std::string& match_query_str, size_t input_rows_count,
                                       const ColumnString* string_col,
                                       InvertedIndexCtx* inverted_index_ctx,
                                       const ColumnArray::Offsets64* array_offsets,
                                       ColumnUInt8::Container& result) const {
    RETURN_IF_ERROR(check(context, name));

    auto query_tokens = analyse_query_str_token(inverted_index_ctx, match_query_str, column_name);
    if (query_tokens.empty()) {
        VLOG_DEBUG << fmt::format(
                "token parser result is empty for query, "
                "please check your query: '{}' and index parser: '{}'",
                match_query_str,
                inverted_index_parser_type_to_string(inverted_index_ctx->parser_type));
        return Status::OK();
    }

    auto current_src_array_offset = 0;
    for (int i = 0; i < input_rows_count; i++) {
        auto data_tokens = analyse_data_token(column_name, inverted_index_ctx, string_col, i,
                                              array_offsets, current_src_array_offset);

        // TODO: more efficient impl
        for (auto& term_info : query_tokens) {
            auto it =
                    std::find_if(data_tokens.begin(), data_tokens.end(), [&](const TermInfo& info) {
                        return info.get_single_term() == term_info.get_single_term();
                    });
            if (it != data_tokens.end()) {
                result[i] = true;
                break;
            }
        }
    }

    return Status::OK();
}

Status FunctionMatchAll::execute_match(FunctionContext* context, const std::string& column_name,
                                       const std::string& match_query_str, size_t input_rows_count,
                                       const ColumnString* string_col,
                                       InvertedIndexCtx* inverted_index_ctx,
                                       const ColumnArray::Offsets64* array_offsets,
                                       ColumnUInt8::Container& result) const {
    RETURN_IF_ERROR(check(context, name));

    auto query_tokens = analyse_query_str_token(inverted_index_ctx, match_query_str, column_name);
    if (query_tokens.empty()) {
        VLOG_DEBUG << fmt::format(
                "token parser result is empty for query, "
                "please check your query: '{}' and index parser: '{}'",
                match_query_str,
                inverted_index_parser_type_to_string(inverted_index_ctx->parser_type));
        return Status::OK();
    }

    auto current_src_array_offset = 0;
    for (int i = 0; i < input_rows_count; i++) {
        auto data_tokens = analyse_data_token(column_name, inverted_index_ctx, string_col, i,
                                              array_offsets, current_src_array_offset);

        // TODO: more efficient impl
        auto find_count = 0;
        for (auto& term_info : query_tokens) {
            auto it =
                    std::find_if(data_tokens.begin(), data_tokens.end(), [&](const TermInfo& info) {
                        return info.get_single_term() == term_info.get_single_term();
                    });
            if (it != data_tokens.end()) {
                ++find_count;
            } else {
                break;
            }
        }

        if (find_count == query_tokens.size()) {
            result[i] = true;
        }
    }

    return Status::OK();
}

Status FunctionMatchPhrase::execute_match(FunctionContext* context, const std::string& column_name,
                                          const std::string& match_query_str,
                                          size_t input_rows_count, const ColumnString* string_col,
                                          InvertedIndexCtx* inverted_index_ctx,
                                          const ColumnArray::Offsets64* array_offsets,
                                          ColumnUInt8::Container& result) const {
    RETURN_IF_ERROR(check(context, name));

    auto query_tokens = analyse_query_str_token(inverted_index_ctx, match_query_str, column_name);
    if (query_tokens.empty()) {
        VLOG_DEBUG << fmt::format(
                "token parser result is empty for query, "
                "please check your query: '{}' and index parser: '{}'",
                match_query_str,
                inverted_index_parser_type_to_string(inverted_index_ctx->parser_type));
        return Status::OK();
    }

    auto current_src_array_offset = 0;
    for (int i = 0; i < input_rows_count; i++) {
        auto data_tokens = analyse_data_token(column_name, inverted_index_ctx, string_col, i,
                                              array_offsets, current_src_array_offset);

        // TODO: more efficient impl
        bool matched = false;
        auto data_it = data_tokens.begin();
        while (data_it != data_tokens.end()) {
            // find position of first token
            data_it = std::find_if(data_it, data_tokens.end(), [&](const TermInfo& info) {
                return info.get_single_term() == query_tokens[0].get_single_term();
            });
            if (data_it != data_tokens.end()) {
                matched = true;
                auto data_it_next = ++data_it;
                auto query_it = query_tokens.begin() + 1;
                // compare query_tokens after the first to data_tokens one by one
                while (query_it != query_tokens.end()) {
                    if (data_it_next == data_tokens.end() ||
                        data_it_next->get_single_term() != query_it->get_single_term()) {
                        matched = false;
                        break;
                    }
                    query_it++;
                    data_it_next++;
                }

                if (matched) {
                    break;
                }
            }
        }

        // check matched
        if (matched) {
            result[i] = true;
        }
    }

    return Status::OK();
}

Status FunctionMatchPhrasePrefix::execute_match(
        FunctionContext* context, const std::string& column_name,
        const std::string& match_query_str, size_t input_rows_count, const ColumnString* string_col,
        InvertedIndexCtx* inverted_index_ctx, const ColumnArray::Offsets64* array_offsets,
        ColumnUInt8::Container& result) const {
    RETURN_IF_ERROR(check(context, name));

    auto query_tokens = analyse_query_str_token(inverted_index_ctx, match_query_str, column_name);
    if (query_tokens.empty()) {
        VLOG_DEBUG << fmt::format(
                "token parser result is empty for query, "
                "please check your query: '{}' and index parser: '{}'",
                match_query_str,
                inverted_index_parser_type_to_string(inverted_index_ctx->parser_type));
        return Status::OK();
    }

    int32_t current_src_array_offset = 0;
    for (int i = 0; i < input_rows_count; i++) {
        auto data_tokens = analyse_data_token(column_name, inverted_index_ctx, string_col, i,
                                              array_offsets, current_src_array_offset);

        int64_t dis_count = data_tokens.size() - query_tokens.size();
        if (dis_count < 0) {
            continue;
        }

        for (size_t j = 0; j < dis_count + 1; j++) {
            if (data_tokens[j].get_single_term() == query_tokens[0].get_single_term() ||
                query_tokens.size() == 1) {
                bool match = true;
                for (size_t k = 0; k < query_tokens.size(); k++) {
                    const std::string& data_token = data_tokens[j + k].get_single_term();
                    const std::string& query_token = query_tokens[k].get_single_term();
                    if (k == query_tokens.size() - 1) {
                        if (data_token.compare(0, query_token.size(), query_token) != 0) {
                            match = false;
                            break;
                        }
                    } else {
                        if (data_token != query_token) {
                            match = false;
                            break;
                        }
                    }
                }
                if (match) {
                    result[i] = true;
                    break;
                }
            }
        }
    }

    return Status::OK();
}

Status FunctionMatchRegexp::execute_match(FunctionContext* context, const std::string& column_name,
                                          const std::string& match_query_str,
                                          size_t input_rows_count, const ColumnString* string_col,
                                          InvertedIndexCtx* inverted_index_ctx,
                                          const ColumnArray::Offsets64* array_offsets,
                                          ColumnUInt8::Container& result) const {
    RETURN_IF_ERROR(check(context, name));

    VLOG_DEBUG << "begin to run FunctionMatchRegexp::execute_match, parser_type: "
               << inverted_index_parser_type_to_string(inverted_index_ctx->parser_type);

    const std::string& pattern = match_query_str;

    hs_database_t* database = nullptr;
    hs_compile_error_t* compile_err = nullptr;
    hs_scratch_t* scratch = nullptr;

    if (hs_compile(pattern.data(), HS_FLAG_DOTALL | HS_FLAG_ALLOWEMPTY | HS_FLAG_UTF8,
                   HS_MODE_BLOCK, nullptr, &database, &compile_err) != HS_SUCCESS) {
        std::string err_message = "hyperscan compilation failed: ";
        err_message.append(compile_err->message);
        LOG(ERROR) << err_message;
        hs_free_compile_error(compile_err);
        return Status::Error<ErrorCode::INDEX_INVALID_PARAMETERS>(err_message);
    }

    if (hs_alloc_scratch(database, &scratch) != HS_SUCCESS) {
        LOG(ERROR) << "hyperscan could not allocate scratch space.";
        hs_free_database(database);
        return Status::Error<ErrorCode::INDEX_INVALID_PARAMETERS>(
                "hyperscan could not allocate scratch space.");
    }

    auto on_match = [](unsigned int id, unsigned long long from, unsigned long long to,
                       unsigned int flags, void* context) -> int {
        *((bool*)context) = true;
        return 0;
    };

    try {
        auto current_src_array_offset = 0;
        for (int i = 0; i < input_rows_count; i++) {
            auto data_tokens = analyse_data_token(column_name, inverted_index_ctx, string_col, i,
                                                  array_offsets, current_src_array_offset);

            for (auto& input : data_tokens) {
                bool is_match = false;
                const auto& input_str = input.get_single_term();
                if (hs_scan(database, input_str.data(), (uint32_t)input_str.size(), 0, scratch,
                            on_match, (void*)&is_match) != HS_SUCCESS) {
                    LOG(ERROR) << "hyperscan match failed: " << input_str;
                    break;
                }

                if (is_match) {
                    result[i] = true;
                    break;
                }
            }
        }
    }
    _CLFINALLY({
        hs_free_scratch(scratch);
        hs_free_database(database);
    })

    return Status::OK();
}

Status FunctionMatchPhraseEdge::execute_match(
        FunctionContext* context, const std::string& column_name,
        const std::string& match_query_str, size_t input_rows_count, const ColumnString* string_col,
        InvertedIndexCtx* inverted_index_ctx, const ColumnArray::Offsets64* array_offsets,
        ColumnUInt8::Container& result) const {
    RETURN_IF_ERROR(check(context, name));

    auto query_tokens = analyse_query_str_token(inverted_index_ctx, match_query_str, column_name);
    if (query_tokens.empty()) {
        VLOG_DEBUG << fmt::format(
                "token parser result is empty for query, "
                "please check your query: '{}' and index parser: '{}'",
                match_query_str,
                inverted_index_parser_type_to_string(inverted_index_ctx->parser_type));
        return Status::OK();
    }

    int32_t current_src_array_offset = 0;
    for (int i = 0; i < input_rows_count; i++) {
        auto data_tokens = analyse_data_token(column_name, inverted_index_ctx, string_col, i,
                                              array_offsets, current_src_array_offset);

        int64_t dis_count = data_tokens.size() - query_tokens.size();
        if (dis_count < 0) {
            continue;
        }

        for (size_t j = 0; j < dis_count + 1; j++) {
            bool match = true;
            if (query_tokens.size() == 1) {
                if (data_tokens[j].get_single_term().find(query_tokens[0].get_single_term()) ==
                    std::string::npos) {
                    match = false;
                }
            } else {
                for (size_t k = 0; k < query_tokens.size(); k++) {
                    const std::string& data_token = data_tokens[j + k].get_single_term();
                    const std::string& query_token = query_tokens[k].get_single_term();
                    if (k == 0) {
                        if (!data_token.ends_with(query_token)) {
                            match = false;
                            break;
                        }
                    } else if (k == query_tokens.size() - 1) {
                        if (!data_token.starts_with(query_token)) {
                            match = false;
                            break;
                        }
                    } else {
                        if (data_token != query_token) {
                            match = false;
                            break;
                        }
                    }
                }
            }
            if (match) {
                result[i] = true;
                break;
            }
        }
    }

    return Status::OK();
}

void register_function_match(SimpleFunctionFactory& factory) {
    factory.register_function<FunctionMatchAny>();
    factory.register_function<FunctionMatchAll>();
    factory.register_function<FunctionMatchPhrase>();
    factory.register_function<FunctionMatchPhrasePrefix>();
    factory.register_function<FunctionMatchRegexp>();
    factory.register_function<FunctionMatchPhraseEdge>();
}
#include "common/compile_check_end.h"
} // namespace doris::vectorized