// 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 <alibabacloud/core/CommonClient.h>

#include <memory>

#include <string>

#include <string_view>

namespace doris::cloud {

struct KmsConf {

    std::string ak;

    std::string sk;

    std::string endpoint;

    std::string region;

    std::string cmk;

    std::string provider;

};

class KmsClient {

public:

    KmsClient(KmsConf&& conf) : conf_(std::move(conf)) {}

    virtual ~KmsClient() = default;

    const KmsConf& conf() const { return conf_; }

    // returns 0 for success otherwise error

    virtual int init() = 0;

    /**

    * @brief This function encrypts the plaintext.

    *

    * @param plaintext The plaintext (base64-encoded)  to be encrypted.

    * @param output Output the ciphertext (base64-encoded).

    * @return int Returns 0 on success and -1 on failure.

    */

    virtual int encrypt(const std::string& plaintext, std::string* output) = 0;

    /**

    * @brief This function decrypts the ciphertext.

    *

    * @param ciphertext The ciphertext (base64-encoded) to be decrypted.

    * @param output Output the decrypted (base64-encoded) plaintext.

    * @return int Returns 0 on success and -1 on failure.

    */

    virtual int decrypt(const std::string& ciphertext, std::string* output) = 0;

    /**

     * @brief This function generate data key

     * 

     * @param ciphertext return ciphertext (base64-encoded)

     * @param plaintext  return plaintext (base64-encoded)

     * @return int Returns 0 on success and -1 on failure. 

     */

    virtual int generate_data_key(std::string* ciphertext, std::string* plaintext) = 0;

protected:

    KmsConf conf_;

};

int create_kms_client(KmsConf&& conf, std::unique_ptr<KmsClient>* kms_client);

class AliKmsClient : public KmsClient {

public:

    explicit AliKmsClient(KmsConf&& conf);

    ~AliKmsClient() override;

    // returns 0 for success otherwise error

    int init() override;

    /**

    * @brief This function encrypts the plaintext.

    *

    * @param plaintext The plaintext (base64-encoded)  to be encrypted.

    * @param output Output the ciphertext (base64-encoded).

    * @return int Returns 0 on success and -1 on failure.

    */

    int encrypt(const std::string& plaintext, std::string* output) override;

    /**

    * @brief This function decrypts the ciphertext.

    *

    * @param ciphertext The ciphertext (base64-encoded) to be decrypted.

    * @param output Output the decrypted (base64-encoded) plaintext.

    * @return int Returns 0 on success and -1 on failure.

    */

    int decrypt(const std::string& ciphertext, std::string* output) override;

    /**

     * @brief This function generate data key

     * 

     * @param ciphertext return ciphertext (base64-encoded)

     * @param plaintext  return plaintext (base64-encoded)

     * @return int Returns 0 on success and -1 on failure. 

     */

    int generate_data_key(std::string* ciphertext, std::string* plaintext) override;

private:

    std::unique_ptr<AlibabaCloud::CommonClient> kms_client_;

};

} // namespace doris::cloud