/*
 * Copyright (c) 2023-2024 Huawei Device Co., Ltd.
 * 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.
 */

#ifndef DATASHARESERVICE_KV_DELEGATE_H
#define DATASHARESERVICE_KV_DELEGATE_H

#include <mutex>
#include <string>

#include "db_delegate.h"
#include "executor_pool.h"
#include "grd_base/grd_db_api.h"

namespace OHOS::DataShare {
class KvDelegate final : public KvDBDelegate {
public:
    KvDelegate(const std::string &path, const std::shared_ptr<ExecutorPool> &executors);
    ~KvDelegate() override;
    int32_t Upsert(const std::string &collectionName, const KvData &value) override;
    int32_t Delete(const std::string &collectionName, const std::string &filter) override;
    int32_t Get(const std::string &collectionName, const Id &id, std::string &value) override;

    int32_t Get(const std::string &collectionName, const std::string &filter, const std::string &projection,
        std::string &result) override;
    int32_t GetBatch(const std::string &collectionName, const std::string &filter, const std::string &projection,
        std::vector<std::string> &result) override;
    void NotifyBackup() override;

private:
    bool Init();
    bool GetVersion(const std::string &collectionName, const std::string &filter, int &version);
    int64_t Upsert(const std::string &collectionName, const std::string &filter, const std::string &value);
    void Flush();
    bool RestoreIfNeed(int32_t dbStatus);
    void Backup();
    void Restore();
    void RemoveDbFile(bool isBackUp);
    bool CopyFile(bool isBackup);
    std::recursive_mutex mutex_;
    std::string path_;
    GRD_DB *db_ = nullptr;
    bool isInitDone_ = false;
    std::shared_ptr<ExecutorPool> executors_ = nullptr;
    ExecutorPool::TaskId taskId_ = ExecutorPool::INVALID_TASK_ID;
    bool hasChange_ = false;
};
} // namespace OHOS::DataShare
#endif // DATASHARESERVICE_KV_DELEGATE_H