#include <aws/core/Aws.h>
#include <aws/s3/S3Client.h>
#include <aws/s3/model/Bucket.h>
#include <aws/core/auth/AWSCredentialsProvider.h>
#include <aws/s3/model/GetObjectRequest.h>
#include <aws/s3/model/PutObjectRequest.h>
#include <aws/s3/model/ListObjectsRequest.h>
#include <aws/s3/model/Object.h>
#include <aws/s3/S3Errors.h>
#include <string>
#include <list>
#include <fstream>
#include "s3client.h"

#include <aws/s3/model/CreateMultipartUploadRequest.h>
#include <aws/s3/model/CompletedPart.h>
#include <aws/s3/model/UploadPartRequest.h>
#include <aws/s3/model/CompleteMultipartUploadRequest.h> 
#include <aws/s3/model/CompletedMultipartUpload.h>
#include <aws/s3/model/AbortMultipartUploadRequest.h>


#include <iostream>
#include <vector>

// mutipart相关
#include <aws/core/utils/threading/Executor.h>
#include <aws/transfer/TransferManager.h>
#include <aws/transfer/TransferHandle.h>
#include <aws/core/utils/memory/AWSMemory.h>
#include <aws/core/utils/memory/stl/AWSStreamFwd.h>
#include <aws/core/utils/stream/PreallocatedStreamBuf.h>
#include <aws/core/utils/StringUtils.h>

#include <aws/s3/model/DeleteObjectRequest.h> 
#include <aws/s3/model/HeadObjectRequest.h> 
#include <aws/s3/model/ListObjectsV2Request.h> 

#define ERROR_ITEM(error_name)                                       \
    {                                                                \
        static_cast<int>(Aws::S3::S3Errors::error_name), #error_name \
    }

static std::list<std::pair<int, std::string>> ERROR_LIST = {
    ERROR_ITEM(INCOMPLETE_SIGNATURE),
    ERROR_ITEM(INTERNAL_FAILURE),
    ERROR_ITEM(INVALID_ACTION),
    ERROR_ITEM(INVALID_CLIENT_TOKEN_ID),
    ERROR_ITEM(INVALID_PARAMETER_COMBINATION),
    ERROR_ITEM(INVALID_QUERY_PARAMETER),
    ERROR_ITEM(INVALID_PARAMETER_VALUE),
    ERROR_ITEM(MISSING_ACTION),
    ERROR_ITEM(MISSING_AUTHENTICATION_TOKEN),
    ERROR_ITEM(MISSING_PARAMETER),
    ERROR_ITEM(OPT_IN_REQUIRED),
    ERROR_ITEM(REQUEST_EXPIRED),
    ERROR_ITEM(SERVICE_UNAVAILABLE),
    ERROR_ITEM(THROTTLING),
    ERROR_ITEM(VALIDATION),
    ERROR_ITEM(ACCESS_DENIED),
    ERROR_ITEM(RESOURCE_NOT_FOUND),
    ERROR_ITEM(UNRECOGNIZED_CLIENT),
    ERROR_ITEM(MALFORMED_QUERY_STRING),
    ERROR_ITEM(SLOW_DOWN),
    ERROR_ITEM(REQUEST_TIME_TOO_SKEWED),
    ERROR_ITEM(INVALID_SIGNATURE),
    ERROR_ITEM(SIGNATURE_DOES_NOT_MATCH),
    ERROR_ITEM(INVALID_ACCESS_KEY_ID),
    ERROR_ITEM(REQUEST_TIMEOUT),
    ERROR_ITEM(NETWORK_CONNECTION),
    ERROR_ITEM(UNKNOWN),
    ERROR_ITEM(BUCKET_ALREADY_EXISTS),
    ERROR_ITEM(BUCKET_ALREADY_OWNED_BY_YOU),
    ERROR_ITEM(NO_SUCH_BUCKET),
    ERROR_ITEM(NO_SUCH_KEY),
    ERROR_ITEM(NO_SUCH_UPLOAD),
    ERROR_ITEM(OBJECT_ALREADY_IN_ACTIVE_TIER),
    ERROR_ITEM(OBJECT_NOT_IN_ACTIVE_TIER),
};

std::list<std::pair<int, std::string>> get_error_list()
{
    return ERROR_LIST;
}
static Aws::SDKOptions options;

static std::unordered_map<std::string, Aws::Utils::Logging::LogLevel> log_level_map = {
    {"off", Aws::Utils::Logging::LogLevel::Off},
    {"fatal", Aws::Utils::Logging::LogLevel::Fatal},
    {"error", Aws::Utils::Logging::LogLevel::Error},
    {"warn", Aws::Utils::Logging::LogLevel::Warn},
    {"info", Aws::Utils::Logging::LogLevel::Info},
    {"debug", Aws::Utils::Logging::LogLevel::Debug},
    {"trace", Aws::Utils::Logging::LogLevel::Trace},
};

void init_api(const std::string &level)
{
    auto itr = log_level_map.find(level);
    if (itr != log_level_map.end())
    {
        options.loggingOptions.logLevel = itr->second;
    }
    Aws::InitAPI(options);
}

void shutdown_api()
{
    Aws::ShutdownAPI(options);
}

S3Client::S3Client(const std::string &ak, const std::string &sk, const std::string &endpoint, bool verify_ssl, bool enable_https, bool use_dual_stack, int threads_num)
{
    Aws::Client::ClientConfiguration config;
    config.endpointOverride = endpoint.c_str();
    config.verifySSL = verify_ssl;
    if (enable_https)
    {
        config.scheme = Aws::Http::Scheme::HTTPS;
    }
    else
    {
        config.scheme = Aws::Http::Scheme::HTTP;
    }

    config.useDualStack = use_dual_stack;
    Aws::Auth::AWSCredentials cred = Aws::Auth::AWSCredentials(ak.c_str(), sk.c_str());
    // this->client = new Aws::S3::S3Client(cred, config, Aws::Client::AWSAuthV4Signer::PayloadSigningPolicy::Never, false);
    this->client = Aws::MakeShared<Aws::S3::S3Client>("S3Client", cred, config, Aws::Client::AWSAuthV4Signer::PayloadSigningPolicy::Never, false);

    // multipart使用
    this->threads_num = threads_num;

    return;
}

S3Client::~S3Client()
{
    // delete this->client;
}

int S3Client::get_object(const std::string &bucket, const std::string &key, int &error_type, std::string &error_message, std::string &result, std::string &range)
{
    Aws::S3::Model::GetObjectRequest object_request;
    object_request.SetBucket(bucket.c_str());
    object_request.SetKey(key.c_str());
    if ("" != range)
        object_request.SetRange(std::string("bytes="+range).c_str());

    /* 这里真正请求数据 */
    auto get_object_outcome = this->client->GetObject(object_request);

    if (get_object_outcome.IsSuccess())
    {
        auto &&get_result = get_object_outcome.GetResultWithOwnership();
        auto content_length = get_result.GetContentLength();
        auto &retrieved_object = get_result.GetBody();

        result.resize(content_length);
        long read_offset = 0;
        while (true)
        {
            retrieved_object.read(&result[read_offset], content_length - read_offset);
            auto read_count = retrieved_object.gcount();
            read_offset += read_count;
            if (read_offset >= content_length || read_count == 0)
            {
                break;
            }
        }
        if (read_offset != content_length)
        {
            //todo
        }

        return 0;
    }
    else
    {
        auto error = get_object_outcome.GetError();
        auto message = error.GetMessage();
        if (!message.empty())
        {
            error_message = message.c_str();
        }
        error_type = static_cast<int>(error.GetErrorType());
        return -1;
    }
    return 0;
}

int S3Client::put_object(const std::string &bucket, const std::string &key, const std::string &data, int &error_type, std::string &error_message)
{
    const std::shared_ptr<Aws::IOStream> input_data = Aws::MakeShared<Aws::StringStream>("");
    *input_data << data;

    Aws::S3::Model::PutObjectRequest request;
    request.SetBucket(bucket.c_str());
    request.SetKey(key.c_str());
    request.SetBody(input_data);
    auto outcome = this->client->PutObject(request);
    if (outcome.IsSuccess())
    {
        return 0;
    }
    else
    {
        auto error = outcome.GetError();
        auto message = error.GetMessage();
        if (!message.empty())
        {
            error_message = message.c_str();
        }
        error_type = static_cast<int>(error.GetErrorType());
        return -1;
    }
}


int S3Client::multipart_download_concurrency(const std::string &bucket, const std::string &key, const std::string &filename, int &error_type, std::string &error_message)
{
    auto executor = Aws::MakeShared<Aws::Utils::Threading::PooledThreadExecutor>("executor", this->threads_num);
    Aws::Transfer::TransferManagerConfiguration transfer_config(executor.get());
    transfer_config.s3Client = this->client;
    auto transfer_manager = Aws::Transfer::TransferManager::Create(transfer_config);

    auto downloadHandle = transfer_manager->DownloadFile(bucket.c_str(),
        key.c_str(),
        [=](){
            return Aws::New<Aws::FStream>("S3_DOWNLOAD", filename.c_str(), std::ios_base::out | std::ios_base::binary);
        });

    downloadHandle->WaitUntilFinished();// Block calling thread until download is complete.
    auto downStat = downloadHandle->GetStatus();
    if (downStat != Aws::Transfer::TransferStatus::COMPLETED)
    {
        auto error = downloadHandle->GetLastError();
        error_message = error.GetMessage().c_str();
        error_type = static_cast<int>(error.GetErrorType());
        return -1;
    }

    return 0;
}

int S3Client::multipart_upload_concurrency(const std::string bucket, const std::string key, const std::string filename, int &error_type, std::string &error_message)
{
    auto executor = Aws::MakeShared<Aws::Utils::Threading::PooledThreadExecutor>("executor", this->threads_num);
    Aws::Transfer::TransferManagerConfiguration transfer_config(executor.get());
    transfer_config.s3Client = this->client;
    auto transfer_manager = Aws::Transfer::TransferManager::Create(transfer_config);

    auto uploadHandle = transfer_manager->UploadFile(filename.c_str(), bucket.c_str(), key.c_str(), "text/plain", Aws::Map<Aws::String, Aws::String>());
    uploadHandle->WaitUntilFinished();
    bool success = uploadHandle->GetStatus() == Aws::Transfer::TransferStatus::COMPLETED; 

    if (!success)
    {
        auto error = uploadHandle->GetLastError();           
        error_message = error.GetMessage().c_str();
        error_type = static_cast<int>(error.GetErrorType());
        return -1;
    }
    else
    {
        return 0;
    }
}

int S3Client::delete_obj(const std::string &bucket, const std::string &key, int error_type, std::string &error_message)
{
    Aws::S3::Model::DeleteObjectRequest request;
    request.WithBucket(bucket.c_str()).WithKey(key.c_str());
    auto outcome = this->client->DeleteObject(request);

    return outcome.IsSuccess();
}

int S3Client::contains(const std::string &bucket, const std::string &key, int error_type, std::string &error_message)
{
    Aws::S3::Model::HeadObjectRequest request;
    request.WithBucket(bucket.c_str()).WithKey(key.c_str());
    const auto response = client->HeadObject(request);
    auto outcome = this->client->HeadObject(request);

    return outcome.IsSuccess();
}

std::vector<std::string> S3Client::list(const std::string &bucket, const std::string &key, int error_type, std::string &error_message)
{
    Aws::S3::Model::ListObjectsRequest request;
    request.WithBucket(bucket.c_str()).WithPrefix(key.c_str());
    std::vector<std::string> res;
    auto outcome = this->client->ListObjects(request);

    if (!outcome.IsSuccess()) {
        auto error = outcome.GetError();
        auto message = error.GetMessage();
        if (!message.empty())
        {
            error_message = message.c_str();
        }
        error_type = static_cast<int>(error.GetErrorType());
        return res;
    }
    else {
        Aws::Vector<Aws::S3::Model::Object> objects =
                outcome.GetResult().GetContents();

        for (Aws::S3::Model::Object &object: objects) {
            std::string full_path = object.GetKey().c_str();
            int pos = full_path.find('/', key.size());
            int len = pos - key.size();
            if (-1 != pos) {
                len += 1;
            }
            std::string first_path = full_path.substr(key.size(), len);
            res.push_back(first_path);
        }
    }

    return res;
}