// 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 <gen_cpp/Types_types.h>

#include <cstddef>

#include <string>

#include <vector>

#include "common/be_mock_util.h"

#include "common/status.h"

#include "core/data_type/data_type.h"

#include "exec/sort/sort_description.h"

#include "exprs/aggregate/aggregate_function.h"

#include "exprs/vexpr_fwd.h"

#include "runtime/runtime_profile.h"

namespace doris {

class RuntimeState;

class SlotDescriptor;

class ObjectPool;

class RowDescriptor;

class TExpr;

class TExprNode;

class TSortInfo;

class Arena;

class Block;

class BufferWritable;

class IColumn;

class AggFnEvaluator {

public:

    ENABLE_FACTORY_CREATOR(AggFnEvaluator);

    MOCK_DEFINE(virtual) ~AggFnEvaluator() = default;

public:

    static Status create(ObjectPool* pool, const TExpr& desc, const TSortInfo& sort_info,

                         const bool without_key, const bool is_window_function,

                         AggFnEvaluator** result);

    Status prepare(RuntimeState* state, const RowDescriptor& desc,

                   const SlotDescriptor* intermediate_slot_desc,

                   const SlotDescriptor* output_slot_desc);

    void set_timer(RuntimeProfile::Counter* merge_timer, RuntimeProfile::Counter* expr_timer) {

        _merge_timer = merge_timer;

        _expr_timer = expr_timer;

    }

    Status open(RuntimeState* state);

    // create/destroy AGG Data

    void create(AggregateDataPtr place);

    void destroy(AggregateDataPtr place);

    // agg_function

    Status execute_single_add(Block* block, AggregateDataPtr place, Arena& arena);

    Status execute_batch_add(Block* block, size_t offset, AggregateDataPtr* places, Arena& arena,

                             bool agg_many = false);

    Status execute_batch_add_selected(Block* block, size_t offset, AggregateDataPtr* places,

                                      Arena& arena);

    Status streaming_agg_serialize_to_column(Block* block, MutableColumnPtr& dst,

                                             const size_t num_rows, Arena& arena);

    void insert_result_info(AggregateDataPtr place, IColumn* column);

    void insert_result_info_vec(const std::vector<AggregateDataPtr>& place, size_t offset,

                                IColumn* column, const size_t num_rows);

    void reset(AggregateDataPtr place);

    DataTypePtr& data_type() { return _data_type; }

    const AggregateFunctionPtr& function() { return _function; }

    static std::string debug_string(const std::vector<AggFnEvaluator*>& exprs);

    std::string debug_string() const;

    bool is_merge() const { return _is_merge; }

    const VExprContextSPtrs& input_exprs_ctxs() const { return _input_exprs_ctxs; }

    static Status check_agg_fn_output(uint32_t key_size, const std::vector<AggFnEvaluator*>& agg_fn,

                                      const RowDescriptor& output_row_desc);

    void set_version(const int version) { _function->set_version(version); }

    AggFnEvaluator* clone(RuntimeState* state, ObjectPool* pool);

    bool is_blockable() const;

private:

    const TFunction _fn;

    const bool _is_merge;

    // We need this flag to distinguish between the two types of aggregation functions:

    // 1. executed without group by key (agg function used with window function is also regarded as this type)

    // 2. executed with group by key

    const bool _without_key;

    const bool _is_window_function;

    AggFnEvaluator(const TExprNode& desc, const bool without_key, const bool is_window_function);

    AggFnEvaluator(AggFnEvaluator& evaluator, RuntimeState* state);

#ifdef BE_TEST

    AggFnEvaluator(bool is_merge, bool without_key, const bool is_window_function)

            : _is_merge(is_merge),

              _without_key(without_key),

              _is_window_function(is_window_function) {};

#endif

    Status _calc_argument_columns(Block* block);

    DataTypes _argument_types_with_sort;

    DataTypes _real_argument_types;

    const SlotDescriptor* _intermediate_slot_desc = nullptr;

    const SlotDescriptor* _output_slot_desc = nullptr;

    RuntimeProfile::Counter* _merge_timer = nullptr;

    RuntimeProfile::Counter* _expr_timer = nullptr;

    // input context

    VExprContextSPtrs _input_exprs_ctxs;

    SortDescription _sort_description;

    DataTypePtr _data_type;

    AggregateFunctionPtr _function;

    std::string _expr_name;

    std::vector<const IColumn*> _agg_columns;

};

} // namespace doris