// 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 "Task.h"


namespace zilliz {
namespace milvus {
namespace engine {

// TODO: rewrite
class XSearchTask : public Task {
public:
    explicit
    XSearchTask(TableFileSchemaPtr file);

    void
    Load(LoadType type, uint8_t device_id) override;

    void
    Execute() override;

public:
    static Status ClusterResult(const std::vector<long> &output_ids,
                                const std::vector<float> &output_distence,
                                uint64_t nq,
                                uint64_t topk,
                                SearchContext::ResultSet &result_set);

    static Status MergeResult(SearchContext::Id2DistanceMap &distance_src,
                              SearchContext::Id2DistanceMap &distance_target,
                              uint64_t topk,
                              bool ascending);

    static Status TopkResult(SearchContext::ResultSet &result_src,
                             uint64_t topk,
                             bool ascending,
                             SearchContext::ResultSet &result_target);

public:
    TableFileSchemaPtr file_;

    size_t index_id_ = 0;
    int index_type_ = 0;
    ExecutionEnginePtr index_engine_ = nullptr;
    bool metric_l2 = true;

    static std::mutex merge_mutex_;
};

}
}
}
