// Copyright 2020 Google LLC
//
// Licensed 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.

#ifndef GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_PUBSUB_INTERNAL_SUBSCRIBER_LOGGING_H
#define GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_PUBSUB_INTERNAL_SUBSCRIBER_LOGGING_H

#include "google/cloud/pubsub/internal/subscriber_stub.h"
#include "google/cloud/pubsub/version.h"
#include "google/cloud/tracing_options.h"
#include <memory>

namespace google {
namespace cloud {
namespace pubsub_internal {
inline namespace GOOGLE_CLOUD_CPP_PUBSUB_NS {

class SubscriberLogging : public SubscriberStub {
 public:
  SubscriberLogging(std::shared_ptr<SubscriberStub> child,
                    TracingOptions tracing_options, bool trace_streams)
      : child_(std::move(child)),
        tracing_options_(std::move(tracing_options)),
        trace_streams_(trace_streams) {}

  StatusOr<google::pubsub::v1::Subscription> CreateSubscription(
      grpc::ClientContext& context,
      google::pubsub::v1::Subscription const& request) override;

  StatusOr<google::pubsub::v1::Subscription> GetSubscription(
      grpc::ClientContext& context,
      google::pubsub::v1::GetSubscriptionRequest const& request) override;

  StatusOr<google::pubsub::v1::Subscription> UpdateSubscription(
      grpc::ClientContext& context,
      google::pubsub::v1::UpdateSubscriptionRequest const& request) override;

  StatusOr<google::pubsub::v1::ListSubscriptionsResponse> ListSubscriptions(
      grpc::ClientContext& context,
      google::pubsub::v1::ListSubscriptionsRequest const& request) override;

  Status DeleteSubscription(
      grpc::ClientContext& context,
      google::pubsub::v1::DeleteSubscriptionRequest const& request) override;

  Status ModifyPushConfig(
      grpc::ClientContext& context,
      google::pubsub::v1::ModifyPushConfigRequest const& request) override;

  std::unique_ptr<AsyncPullStream> AsyncStreamingPull(
      google::cloud::CompletionQueue& cq,
      std::unique_ptr<grpc::ClientContext> context,
      google::pubsub::v1::StreamingPullRequest const& request) override;

  StatusOr<google::pubsub::v1::Snapshot> CreateSnapshot(
      grpc::ClientContext& context,
      google::pubsub::v1::CreateSnapshotRequest const& request) override;

  StatusOr<google::pubsub::v1::Snapshot> GetSnapshot(
      grpc::ClientContext& context,
      google::pubsub::v1::GetSnapshotRequest const& request) override;

  StatusOr<google::pubsub::v1::ListSnapshotsResponse> ListSnapshots(
      grpc::ClientContext& context,
      google::pubsub::v1::ListSnapshotsRequest const& request) override;

  StatusOr<google::pubsub::v1::Snapshot> UpdateSnapshot(
      grpc::ClientContext& context,
      google::pubsub::v1::UpdateSnapshotRequest const& request) override;

  Status DeleteSnapshot(
      grpc::ClientContext& context,
      google::pubsub::v1::DeleteSnapshotRequest const& request) override;

  StatusOr<google::pubsub::v1::SeekResponse> Seek(
      grpc::ClientContext& context,
      google::pubsub::v1::SeekRequest const& request) override;

 private:
  std::shared_ptr<SubscriberStub> child_;
  TracingOptions tracing_options_;
  bool trace_streams_;
};

class LoggingAsyncPullStream : public SubscriberStub::AsyncPullStream {
 public:
  LoggingAsyncPullStream(std::unique_ptr<SubscriberStub::AsyncPullStream> child,
                         TracingOptions tracing_options,
                         std::string request_id);

  void Cancel() override;
  future<bool> Start() override;
  future<absl::optional<google::pubsub::v1::StreamingPullResponse>> Read()
      override;
  future<bool> Write(google::pubsub::v1::StreamingPullRequest const&,
                     grpc::WriteOptions) override;
  future<bool> WritesDone() override;
  future<Status> Finish() override;

 private:
  std::unique_ptr<SubscriberStub::AsyncPullStream> child_;
  TracingOptions tracing_options_;
  std::string request_id_;
};

}  // namespace GOOGLE_CLOUD_CPP_PUBSUB_NS
}  // namespace pubsub_internal
}  // namespace cloud
}  // namespace google

#endif  // GOOGLE_CLOUD_CPP_GOOGLE_CLOUD_PUBSUB_INTERNAL_SUBSCRIBER_LOGGING_H