// 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 "MemManager.h"
#include "MemTable.h"
#include "db/meta/Meta.h"
#include "utils/Status.h"

#include <ctime>
#include <map>
#include <memory>
#include <mutex>
#include <set>
#include <string>
#include <vector>

namespace milvus {
namespace engine {

class MemManagerImpl : public MemManager {
 public:
    using Ptr = std::shared_ptr<MemManagerImpl>;

    MemManagerImpl(const meta::MetaPtr& meta, const DBOptions& options) : meta_(meta), options_(options) {
    }

    Status
    InsertVectors(const std::string& table_id, size_t n, const float* vectors, IDNumbers& vector_ids) override;

    Status
    Serialize(std::set<std::string>& table_ids) override;

    Status
    EraseMemVector(const std::string& table_id) override;

    size_t
    GetCurrentMutableMem() override;

    size_t
    GetCurrentImmutableMem() override;

    size_t
    GetCurrentMem() override;

 private:
    MemTablePtr
    GetMemByTable(const std::string& table_id);

    Status
    InsertVectorsNoLock(const std::string& table_id, size_t n, const float* vectors, IDNumbers& vector_ids);
    Status
    ToImmutable();

    using MemIdMap = std::map<std::string, MemTablePtr>;
    using MemList = std::vector<MemTablePtr>;
    MemIdMap mem_id_map_;
    MemList immu_mem_list_;
    meta::MetaPtr meta_;
    DBOptions options_;
    std::mutex mutex_;
    std::mutex serialization_mtx_;
};  // NewMemManager

}  // namespace engine
}  // namespace milvus
