// 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 <aws/core/Aws.h>

#include <aws/core/client/ClientConfiguration.h>

#include <aws/s3/S3Errors.h>

#include <bvar/bvar.h>

#include <fmt/format.h>

#include <gen_cpp/AgentService_types.h>

#include <gen_cpp/cloud.pb.h>

#include <functional>

#include <map>

#include <memory>

#include <mutex>

#include <string>

#include <unordered_map>

#include "common/status.h"

#include "core/string_ref.h"

#include "cpp/aws_common.h"

#include "cpp/client/auth/aws_credential_factory.h"

#include "cpp/client/obj_storage_client.h"

namespace Aws::S3 {

class S3Client;

} // namespace Aws::S3

namespace bvar {

template <typename T>

class Adder;

}

namespace doris {

std::string hide_access_key(const std::string& ak);

class S3URI;

struct S3ClientConf {

    std::string endpoint;

    std::string region;

    std::string ak;

    std::string sk;

    std::string token;

    // For azure we'd better support the bucket at the first time init azure blob container client

    std::string bucket;

    io::ObjStorageType provider = io::ObjStorageType::AWS;

    int max_connections = -1;

    int request_timeout_ms = -1;

    int connect_timeout_ms = -1;

    bool use_virtual_addressing = true;

    // For aws s3, no need to override endpoint

    bool need_override_endpoint = true;

    CredProviderType cred_provider_type = CredProviderType::Default;

    std::string role_arn;

    std::string external_id;

    // True when this client is bound to a Doris internal object storage bucket

    // (a storage vault in cloud mode). S3ClientFactory wraps such clients with the

    // shared rate limiter; external buckets (S3 load, TVF, external catalogs) are

    // returned bare in cloud mode.

    bool is_internal_bucket = false;

    // Full-field identity. get_hash() is only good for picking an unordered_map

    // bucket; distinct configurations can collide, so never treat hash equality as

    // configuration equality.

    bool operator==(const S3ClientConf&) const = default;

    uint64_t get_hash() const {

        uint64_t hash_code = 0;

        // Use crc32_hash(ak + sk) hash to prevent swapped AK/SK order from producing same result.

        hash_code ^= crc32_hash(ak + sk);

        hash_code ^= crc32_hash(token);

        hash_code ^= crc32_hash(endpoint);

        hash_code ^= crc32_hash(region);

        hash_code ^= crc32_hash(bucket);

        hash_code ^= max_connections;

        hash_code ^= request_timeout_ms;

        hash_code ^= connect_timeout_ms;

        hash_code ^= use_virtual_addressing;

        hash_code ^= static_cast<int>(provider);

        hash_code ^= static_cast<int>(cred_provider_type);

        hash_code ^= crc32_hash(role_arn);

        hash_code ^= crc32_hash(external_id);

        hash_code ^= is_internal_bucket;

        return hash_code;

    }

    std::string to_string() const {

        return fmt::format(

                "(ak={}, token={}, endpoint={}, region={}, bucket={}, max_connections={}, "

                "request_timeout_ms={}, connect_timeout_ms={}, use_virtual_addressing={}, "

                "cred_provider_type={},role_arn={}, external_id={}, is_internal_bucket={}",

                hide_access_key(ak), token.empty() ? "" : "******", endpoint, region, bucket,

                max_connections, request_timeout_ms, connect_timeout_ms, use_virtual_addressing,

                cred_provider_type, role_arn, external_id, is_internal_bucket);

    }

};

struct S3ClientConfHash {

    size_t operator()(const S3ClientConf& conf) const {

        return static_cast<size_t>(conf.get_hash());

    }

};

struct S3Conf {

    std::string bucket;

    std::string prefix;

    S3ClientConf client_conf;

    bool sse_enabled = false;

    static S3Conf get_s3_conf(const cloud::ObjectStoreInfoPB&);

    static S3Conf get_s3_conf(const TS3StorageParam&);

    std::string to_string() const {

        return fmt::format("(bucket={}, prefix={}, client_conf={}, sse_enabled={})", bucket, prefix,

                           client_conf.to_string(), sse_enabled);

    }

};

class S3ClientFactory {

public:

    ~S3ClientFactory();

    static S3ClientFactory& instance();

    Result<std::shared_ptr<io::ObjStorageClient>> create(const S3ClientConf& s3_conf);

    static Status convert_properties_to_s3_conf(const std::map<std::string, std::string>& prop,

                                                const S3URI& s3_uri, S3Conf* s3_conf);

    static Aws::Client::ClientConfiguration& getClientConfiguration() {

        // The default constructor of ClientConfiguration will do some http call

        // such as Aws::Internal::GetEC2MetadataClient and other init operation,

        // which is unnecessary.

        // So here we use a static instance, and deep copy every time

        // to avoid unnecessary operations.

        static Aws::Client::ClientConfiguration instance;

        instance.requestTimeoutMs = config::aws_client_request_timeout_ms;

        return instance;

    }

    AwsCredentialResult create_aws_credentials_provider(const S3ClientConf& s3_conf);

#ifdef BE_TEST

    void set_client_creator_for_test(

            std::function<std::shared_ptr<io::ObjStorageClient>(const S3ClientConf&)> creator);

    void clear_client_creator_for_test();

#endif

private:

    Result<std::shared_ptr<io::ObjStorageBackend>> _create_s3_backend(const S3ClientConf& s3_conf);

    Result<std::shared_ptr<io::ObjStorageBackend>> _create_azure_backend(

            const S3ClientConf& s3_conf);

    S3ClientFactory();

    Aws::SDKOptions _aws_options;

    std::mutex _lock;

    std::unordered_map<S3ClientConf, std::shared_ptr<io::ObjStorageClient>, S3ClientConfHash>

            _cache;

    std::string _ca_cert_file_path;

#ifdef BE_TEST

    std::function<std::shared_ptr<io::ObjStorageClient>(const S3ClientConf&)> _test_client_creator;

#endif

};

} // end namespace doris