// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// Licensed 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 <map>

#include "exceptions/EasyAssert.h"
#include "indexbuilder/VecIndexCreator.h"
#include "index/Utils.h"
#include "index/IndexFactory.h"
#include "pb/index_cgo_msg.pb.h"

#ifdef BUILD_DISK_ANN
#include "storage/DiskFileManagerImpl.h"
#endif

namespace milvus::indexbuilder {

VecIndexCreator::VecIndexCreator(DataType data_type,
                                 const char* serialized_type_params,
                                 const char* serialized_index_params,
                                 const storage::StorageConfig& storage_config)
    : data_type_(data_type) {
    proto::indexcgo::TypeParams type_params_;
    proto::indexcgo::IndexParams index_params_;
    milvus::index::ParseFromString(type_params_,
                                   std::string(serialized_type_params));
    milvus::index::ParseFromString(index_params_,
                                   std::string(serialized_index_params));

    for (auto i = 0; i < type_params_.params_size(); ++i) {
        const auto& param = type_params_.params(i);
        config_[param.key()] = param.value();
    }

    for (auto i = 0; i < index_params_.params_size(); ++i) {
        const auto& param = index_params_.params(i);
        config_[param.key()] = param.value();
    }

    index::CreateIndexInfo index_info;
    index_info.field_type = data_type_;
    index_info.index_type = index::GetIndexTypeFromConfig(config_);
    index_info.metric_type = index::GetMetricTypeFromConfig(config_);

    std::shared_ptr<storage::FileManagerImpl> file_manager = nullptr;
#ifdef BUILD_DISK_ANN
    if (index::is_in_disk_list(index_info.index_type)) {
        // For now, only support diskann index
        file_manager = std::make_shared<storage::DiskFileManagerImpl>(
            index::GetFieldDataMetaFromConfig(config_),
            index::GetIndexMetaFromConfig(config_),
            storage_config);
    }
#endif

    index_ = index::IndexFactory::GetInstance().CreateIndex(index_info,
                                                            file_manager);
    AssertInfo(index_ != nullptr,
               "[VecIndexCreator]Index is null after create index");
}

int64_t
VecIndexCreator::dim() {
    return index::GetDimFromConfig(config_);
}

void
VecIndexCreator::Build(const milvus::DatasetPtr& dataset) {
    index_->BuildWithDataset(dataset, config_);
}

milvus::BinarySet
VecIndexCreator::Serialize() {
    return index_->Serialize(config_);
}

void
VecIndexCreator::Load(const milvus::BinarySet& binary_set) {
    index_->Load(binary_set, config_);
}

std::unique_ptr<SearchResult>
VecIndexCreator::Query(const milvus::DatasetPtr& dataset,
                       const SearchInfo& search_info,
                       const BitsetView& bitset) {
    auto vector_index = dynamic_cast<index::VectorIndex*>(index_.get());
    return vector_index->Query(dataset, search_info, bitset);
}

void
VecIndexCreator::CleanLocalData() {
    auto vector_index = dynamic_cast<index::VectorIndex*>(index_.get());
    vector_index->CleanLocalData();
}

}  // namespace milvus::indexbuilder