// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
/**
 * Before running this C++ code example, set up your development environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * https://docs.aws.amazon.com/sdk-for-cpp/v1/developer-guide/getting-started.html
 *
 * For information on the structure of the code examples and how to build and run the examples, see
 * https://docs.aws.amazon.com/sdk-for-cpp/v1/developer-guide/getting-started-code-examples.html.
 *
 **/

#include <aws/core/Aws.h>
#include <aws/sns/SNSClient.h>
#include <aws/sns/model/ListSubscriptionsRequest.h>
#include <iostream>
#include "sns_samples.h"

// snippet-start:[sns.cpp.list_subscriptions.code]
//! Retrieve a list of Amazon Simple Notification Service (Amazon SNS) subscriptions.
/*!
  \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
 */
bool AwsDoc::SNS::listSubscriptions(
        const Aws::Client::ClientConfiguration &clientConfiguration) {
    Aws::SNS::SNSClient snsClient(clientConfiguration);

    Aws::String nextToken; // Next token is used to handle a paginated response.
    bool result = true;
    Aws::Vector<Aws::SNS::Model::Subscription> subscriptions;
    do {
        Aws::SNS::Model::ListSubscriptionsRequest request;

        if (!nextToken.empty()) {
            request.SetNextToken(nextToken);
        }

        const Aws::SNS::Model::ListSubscriptionsOutcome outcome = snsClient.ListSubscriptions(
                request);

        if (outcome.IsSuccess()) {
            const Aws::Vector<Aws::SNS::Model::Subscription> &newSubscriptions =
                    outcome.GetResult().GetSubscriptions();
            subscriptions.insert(subscriptions.cend(), newSubscriptions.begin(),
                                 newSubscriptions.end());
        }
        else {
            std::cerr << "Error listing subscriptions "
                      << outcome.GetError().GetMessage()
                      <<
                      std::endl;
            result = false;
            break;
        }

        nextToken = outcome.GetResult().GetNextToken();
    } while (!nextToken.empty());

    if (result) {
        if (subscriptions.empty()) {
            std::cout << "No subscriptions found" << std::endl;
        }
        else {
            std::cout << "Subscriptions list:" << std::endl;
            for (auto const &subscription: subscriptions) {
                std::cout << "  * " << subscription.GetSubscriptionArn() << std::endl;
            }
        }
    }
    return result;
}
// snippet-end:[sns.cpp.list_subscriptions.code]

/*
 *
 *  main function
 *
 *  Usage: 'run_list_subscriptions'
 *
*/

#ifndef TESTING_BUILD

int main(int argc, char **argv) {
    if (argc != 1) {
        std::cout << "Usage: run_list_subscriptions" << std::endl;
        return 1;
    }
    Aws::SDKOptions options;

    Aws::InitAPI(options);
    {
        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";

        AwsDoc::SNS::listSubscriptions(clientConfig);
    }
    Aws::ShutdownAPI(options);
    return 0;
}

#endif // TESTING_BUILD