// 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 "core/assert_cast.h"

#include "core/column/column_nullable.h"

#include "core/column/column_vector.h"

#include "core/data_type/data_type.h"

#include "core/data_type/data_type_nullable.h"

#include "core/data_type/data_type_number.h"

#include "core/data_type/define_primitive_type.h"

#include "core/data_type/primitive_type.h"

#include "core/types.h"

#include "exprs/aggregate/aggregate_function.h"

#include "exprs/aggregate/aggregate_function_bit.h"

namespace doris {

struct AggregateFunctionBoolXorData {

    static constexpr auto name = "bool_xor";

    void add(bool x) {

        if (x && _st < 2) {

            ++_st;

        }

    }

    void merge(const AggregateFunctionBoolXorData& rhs) {

        if (_st == 0) {

            _st = rhs._st;

        } else if (_st == 1) {

            _st = (rhs._st > 0) ? 2 : 1;

        }

    }

    void write(BufferWritable& buf) const { buf.write_binary(_st); }

    void read(BufferReadable& buf) { buf.read_binary(_st); }

    void reset() { _st = 0; }

    bool get() const { return _st == 1; }

private:

    // represents the current XOR state

    // '0': there are no true values currently

    // '1': exactly one true value has appeared

    // '2': two true values have already appeared and will not change thereafter

    uint8_t _st = 0;

};

template <typename BoolFunc>

class AggregateFuntionBoolUnion final

        : public IAggregateFunctionDataHelper<BoolFunc, AggregateFuntionBoolUnion<BoolFunc>>,

          NullableAggregateFunction,

          UnaryExpression {

public:

    explicit AggregateFuntionBoolUnion(const DataTypes& argument_types_)

            : IAggregateFunctionDataHelper<BoolFunc, AggregateFuntionBoolUnion<BoolFunc>>(

                      argument_types_) {}

    String get_name() const override { return BoolFunc::name; }

    DataTypePtr get_return_type() const override { return std::make_shared<DataTypeBool>(); }

    void add(AggregateDataPtr __restrict place, const IColumn** columns, ssize_t row_num,

             Arena&) const override {

        this->data(place).add(

                assert_cast<const ColumnUInt8&, TypeCheckOnRelease::DISABLE>(*columns[0])

                        .get_element(row_num));

    }

    void reset(AggregateDataPtr __restrict place) const override { this->data(place).reset(); }

    void merge(AggregateDataPtr __restrict place, ConstAggregateDataPtr rhs,

               Arena&) const override {

        this->data(place).merge(this->data(rhs));

    }

    void serialize(ConstAggregateDataPtr __restrict place, BufferWritable& buf) const override {

        this->data(place).write(buf);

    }

    void deserialize(AggregateDataPtr __restrict place, BufferReadable& buf,

                     Arena&) const override {

        this->data(place).read(buf);

    }

    void insert_result_into(ConstAggregateDataPtr __restrict place, IColumn& to) const override {

        assert_cast<ColumnUInt8&>(to).insert_value(this->data(place).get());

    }

};

} // namespace doris