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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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#include <chrono>
#include <fstream>
#include <memory>
#include <sstream>
#include <string>
#include <thread>

#include <grpc/grpc.h>
#include <grpc/support/log.h>
#include <google/gflags.h>
#include <grpc++/channel_interface.h>
#include <grpc++/create_channel.h>
#include <grpc++/credentials.h>
#include <grpc++/status.h>

#include "examples/pubsub/publisher.h"
#include "examples/pubsub/subscriber.h"
#include "test/cpp/util/create_test_channel.h"

DEFINE_int32(server_port, 443, "Server port.");
DEFINE_string(server_host,
              "pubsub-staging.googleapis.com", "Server host to connect to");
DEFINE_string(project_id, "", "GCE project id such as stoked-keyword-656");
DEFINE_string(service_account_key_file, "",
              "Path to service account json key file.");
DEFINE_string(oauth_scope,
              "https://www.googleapis.com/auth/cloud-platform",
              "Scope for OAuth tokens.");

namespace {

const char kTopic[] = "testtopics";
const char kSubscriptionName[] = "testsubscription";
const char kMessageData[] = "Test Data";

}  // namespace

grpc::string GetServiceAccountJsonKey() {
  grpc::string json_key;
  if (json_key.empty()) {
    std::ifstream json_key_file(FLAGS_service_account_key_file);
    std::stringstream key_stream;
    key_stream << json_key_file.rdbuf();
    json_key = key_stream.str();
  }
  return json_key;
}

int main(int argc, char** argv) {
  grpc_init();
  google::ParseCommandLineFlags(&argc, &argv, true);
  gpr_log(GPR_INFO, "Start PUBSUB client");

  std::ostringstream ss;

  std::unique_ptr<grpc::Credentials> creds;
  if (FLAGS_service_account_key_file != "") {
    grpc::string json_key = GetServiceAccountJsonKey();
    creds = grpc::CredentialsFactory::ServiceAccountCredentials(
        json_key, FLAGS_oauth_scope, std::chrono::hours(1));
  } else {
    creds = grpc::CredentialsFactory::ComputeEngineCredentials();
  }

  ss << FLAGS_server_host << ":" << FLAGS_server_port;
  std::shared_ptr<grpc::ChannelInterface> channel(
      grpc::CreateTestChannel(
          ss.str(),
          FLAGS_server_host,
          true,                // enable SSL
          true,                // use prod roots
          creds));

  grpc::examples::pubsub::Publisher publisher(channel);
  grpc::examples::pubsub::Subscriber subscriber(channel);

  GPR_ASSERT(FLAGS_project_id != "");
  ss.str("");
  ss << "/topics/" << FLAGS_project_id << "/" << kTopic;
  grpc::string topic = ss.str();

  ss.str("");
  ss << FLAGS_project_id << "/"  << kSubscriptionName;
  grpc::string subscription_name = ss.str();

  // Clean up test topic and subcription if they exist before.
  grpc::string subscription_topic;
  if (subscriber.GetSubscription(
      subscription_name, &subscription_topic).IsOk()) {
    subscriber.DeleteSubscription(subscription_name);
  }
  if (publisher.GetTopic(topic).IsOk()) publisher.DeleteTopic(topic);

  grpc::Status s = publisher.CreateTopic(topic);
  gpr_log(GPR_INFO, "Create topic returns code %d, %s",
          s.code(), s.details().c_str());
  GPR_ASSERT(s.IsOk());

  s = publisher.GetTopic(topic);
  gpr_log(GPR_INFO, "Get topic returns code %d, %s",
          s.code(), s.details().c_str());
  GPR_ASSERT(s.IsOk());

  std::vector<grpc::string> topics;
  s = publisher.ListTopics(FLAGS_project_id, &topics);
  gpr_log(GPR_INFO, "List topic returns code %d, %s",
          s.code(), s.details().c_str());
  bool topic_found = false;
  for (unsigned int i = 0; i < topics.size(); i++) {
    if (topics[i] == topic) topic_found = true;
    gpr_log(GPR_INFO, "topic: %s", topics[i].c_str());
  }
  GPR_ASSERT(s.IsOk());
  GPR_ASSERT(topic_found);

  s = subscriber.CreateSubscription(topic, subscription_name);
  gpr_log(GPR_INFO, "create subscrption returns code %d, %s",
          s.code(), s.details().c_str());
  GPR_ASSERT(s.IsOk());

  s = publisher.Publish(topic, kMessageData);
  gpr_log(GPR_INFO, "Publish %s returns code %d, %s",
          kMessageData, s.code(), s.details().c_str());
  GPR_ASSERT(s.IsOk());

  grpc::string data;
  s = subscriber.Pull(subscription_name, &data);
  gpr_log(GPR_INFO, "Pull %s", data.c_str());

  s =  subscriber.DeleteSubscription(subscription_name);
  gpr_log(GPR_INFO, "Delete subscription returns code %d, %s",
          s.code(), s.details().c_str());
  GPR_ASSERT(s.IsOk());

  s = publisher.DeleteTopic(topic);
  gpr_log(GPR_INFO, "Delete topic returns code %d, %s",
          s.code(), s.details().c_str());
  GPR_ASSERT(s.IsOk());

  subscriber.Shutdown();
  publisher.Shutdown();
  channel.reset();
  grpc_shutdown();
  return 0;
}