// 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/aggregate/aggregate_function_topn.h"

#include <fmt/format.h>
#include <glog/logging.h>

#include "core/data_type/data_type.h"
#include "core/data_type/define_primitive_type.h"
#include "exprs/aggregate/aggregate_function_simple_factory.h"
#include "exprs/aggregate/helpers.h"

namespace doris {
#include "common/compile_check_begin.h"

AggregateFunctionPtr create_aggregate_function_topn(const std::string& name,
                                                    const DataTypes& argument_types,
                                                    const DataTypePtr& result_type,
                                                    const bool result_is_nullable,
                                                    const AggregateFunctionAttr& attr) {
    if (argument_types.size() == 2) {
        return creator_without_type::create<AggregateFunctionTopN<AggregateFunctionTopNImplInt>>(
                argument_types, result_is_nullable, attr);
    } else if (argument_types.size() == 3) {
        return creator_without_type::create<AggregateFunctionTopN<AggregateFunctionTopNImplIntInt>>(
                argument_types, result_is_nullable, attr);
    }
    return nullptr;
}

// Forward declarations — implementations live in separate TUs
AggregateFunctionPtr create_aggregate_function_topn_array(const std::string& name,
                                                          const DataTypes& argument_types,
                                                          const DataTypePtr& result_type,
                                                          const bool result_is_nullable,
                                                          const AggregateFunctionAttr& attr);

AggregateFunctionPtr create_aggregate_function_topn_weighted(const std::string& name,
                                                             const DataTypes& argument_types,
                                                             const DataTypePtr& result_type,
                                                             const bool result_is_nullable,
                                                             const AggregateFunctionAttr& attr);

void register_aggregate_function_topn(AggregateFunctionSimpleFactory& factory) {
    factory.register_function_both("topn", create_aggregate_function_topn);
    factory.register_function_both("topn_array", create_aggregate_function_topn_array);
    factory.register_function_both("topn_weighted", create_aggregate_function_topn_weighted);
}

} // namespace doris