// 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

#pragma once

#include <stdint.h>
#include <memory>
#include <shared_mutex>
#include <string>
#include <string_view>

#include "common/IndexMeta.h"
#include "common/Schema.h"
#include "pb/schema.pb.h"

namespace milvus::segcore {

class Collection {
 public:
    explicit Collection(const milvus::proto::schema::CollectionSchema* schema);
    explicit Collection(const std::string_view schema_proto);
    explicit Collection(const void* collection_proto, const int64_t length);

    void
    parseIndexMeta(const void* index_meta_proto_blob, const int64_t length);

    void
    parse_schema(const void* schema_proto_blob,
                 const int64_t length,
                 const uint64_t version);

 public:
    SchemaPtr
    get_schema() {
        std::shared_lock lock(schema_mutex_);
        return schema_;
    }

    uint64_t
    get_schema_version() {
        std::shared_lock lock(schema_mutex_);
        return schema_->get_schema_version();
    }

    void
    set_schema(SchemaPtr& new_schema) {
        std::unique_lock lock(schema_mutex_);
        auto old_schema = schema_;
        if (new_schema->get_schema_version() > schema_->get_schema_version()) {
            schema_ = new_schema;
        }

        if (old_schema) {
            schema_->UpdateLoadFields(old_schema->load_fields());
        }
    }

    IndexMetaPtr
    get_index_meta() {
        std::shared_lock lock(index_meta_mutex_);
        return index_meta_;
    }

    void
    set_index_meta(const IndexMetaPtr index_meta) {
        std::unique_lock lock(index_meta_mutex_);
        index_meta_ = index_meta;
    }

    const std::string_view
    get_collection_name() {
        return collection_name_;
    }

 private:
    std::string collection_name_;
    SchemaPtr schema_;
    std::shared_mutex schema_mutex_;
    IndexMetaPtr index_meta_;
    std::shared_mutex index_meta_mutex_;
};

using CollectionPtr = std::unique_ptr<Collection>;

}  // namespace milvus::segcore
