// 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 <cstdint>

#include <memory>

#include "common/factory_creator.h"

#include "olap/column_predicate.h"

#include "olap/rowset/segment_v2/bloom_filter.h"

#include "olap/rowset/segment_v2/inverted_index_reader.h"

#include "olap/wrapper_field.h"

#include "vec/columns/column_dictionary.h"

namespace doris {

// SharedPredicate only used on topn runtime predicate.

// Runtime predicate globally share one predicate, to ensure that updates can be real-time.

// At the beginning nested predicate may be nullptr, in which case predicate always returns true.

class SharedPredicate : public ColumnPredicate {

    ENABLE_FACTORY_CREATOR(SharedPredicate);

public:

    SharedPredicate(uint32_t column_id) : ColumnPredicate(column_id) {}

    PredicateType type() const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            // topn filter is le or ge

            return PredicateType::LE;

        }

        return _nested->type();

    }

    void set_nested(ColumnPredicate* nested) {

        std::unique_lock<std::shared_mutex> lock(_mtx);

        _nested.reset(nested);

    }

    Status evaluate(const vectorized::IndexFieldNameAndTypePair& name_with_type,

                    IndexIterator* iterator, uint32_t num_rows,

                    roaring::Roaring* bitmap) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return Status::OK();

        }

        return _nested->evaluate(name_with_type, iterator, num_rows, bitmap);

    }

    void evaluate_and(const vectorized::IColumn& column, const uint16_t* sel, uint16_t size,

                      bool* flags) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return;

        }

        return _nested->evaluate_and(column, sel, size, flags);

    }

    void evaluate_or(const vectorized::IColumn& column, const uint16_t* sel, uint16_t size,

                     bool* flags) const override {

        DCHECK(false) << "should not reach here";

    }

    bool evaluate_and(const std::pair<WrapperField*, WrapperField*>& statistic) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return ColumnPredicate::evaluate_and(statistic);

        }

        return _nested->evaluate_and(statistic);

    }

    bool evaluate_del(const std::pair<WrapperField*, WrapperField*>& statistic) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return ColumnPredicate::evaluate_del(statistic);

        }

        return _nested->evaluate_del(statistic);

    }

    bool evaluate_and(const BloomFilter* bf) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return ColumnPredicate::evaluate_and(bf);

        }

        return _nested->evaluate_and(bf);

    }

    bool can_do_bloom_filter(bool ngram) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return ColumnPredicate::can_do_bloom_filter(ngram);

        }

        return _nested->can_do_bloom_filter(ngram);

    }

    void evaluate_vec(const vectorized::IColumn& column, uint16_t size,

                      bool* flags) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            for (uint16_t i = 0; i < size; ++i) {

                flags[i] = true;

            }

            return;

        }

        _nested->evaluate_vec(column, size, flags);

    }

    void evaluate_and_vec(const vectorized::IColumn& column, uint16_t size,

                          bool* flags) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return;

        }

        _nested->evaluate_and_vec(column, size, flags);

    }

    std::string get_search_str() const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            DCHECK(false) << "should not reach here";

        }

        return _nested->get_search_str();

    }

private:

    uint16_t _evaluate_inner(const vectorized::IColumn& column, uint16_t* sel,

                             uint16_t size) const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return size;

        }

        return _nested->evaluate(column, sel, size);

    }

    std::string _debug_string() const override {

        std::shared_lock<std::shared_mutex> lock(_mtx);

        if (!_nested) {

            return "shared_predicate(unknow)";

        }

        return "shared_predicate(" + _nested->debug_string() + ")";

    }

    mutable std::shared_mutex _mtx;

    std::shared_ptr<ColumnPredicate> _nested;

};

} //namespace doris