/*
 *
 * Copyright 2016 gRPC authors.
 *
 * 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 GRPC_TEST_CPP_END2END_TEST_SERVICE_IMPL_H
#define GRPC_TEST_CPP_END2END_TEST_SERVICE_IMPL_H

#include <condition_variable>
#include <memory>
#include <mutex>

#include <grpc/grpc.h>
#include <grpcpp/server_context.h>

#include "src/proto/grpc/testing/echo.grpc.pb.h"

namespace grpc {
namespace testing {

const int kServerDefaultResponseStreamsToSend = 3;
const char* const kServerResponseStreamsToSend = "server_responses_to_send";
const char* const kServerTryCancelRequest = "server_try_cancel";
const char* const kDebugInfoTrailerKey = "debug-info-bin";
const char* const kServerFinishAfterNReads = "server_finish_after_n_reads";
const char* const kServerUseCoalescingApi = "server_use_coalescing_api";
const char* const kCheckClientInitialMetadataKey = "custom_client_metadata";
const char* const kCheckClientInitialMetadataVal = "Value for client metadata";

typedef enum {
  DO_NOT_CANCEL = 0,
  CANCEL_BEFORE_PROCESSING,
  CANCEL_DURING_PROCESSING,
  CANCEL_AFTER_PROCESSING
} ServerTryCancelRequestPhase;

class TestServiceSignaller {
 public:
  void ClientWaitUntilRpcStarted() {
    std::unique_lock<std::mutex> lock(mu_);
    cv_rpc_started_.wait(lock, [this] { return rpc_started_; });
  }
  void ServerWaitToContinue() {
    std::unique_lock<std::mutex> lock(mu_);
    cv_server_continue_.wait(lock, [this] { return server_should_continue_; });
  }
  void SignalClientThatRpcStarted() {
    std::unique_lock<std::mutex> lock(mu_);
    rpc_started_ = true;
    cv_rpc_started_.notify_one();
  }
  void SignalServerToContinue() {
    std::unique_lock<std::mutex> lock(mu_);
    server_should_continue_ = true;
    cv_server_continue_.notify_one();
  }

 private:
  std::mutex mu_;
  std::condition_variable cv_rpc_started_;
  bool rpc_started_ /* GUARDED_BY(mu_) */ = false;
  std::condition_variable cv_server_continue_;
  bool server_should_continue_ /* GUARDED_BY(mu_) */ = false;
};

class TestServiceImpl : public ::grpc::testing::EchoTestService::Service {
 public:
  TestServiceImpl() : signal_client_(false), host_() {}
  explicit TestServiceImpl(const grpc::string& host)
      : signal_client_(false), host_(new grpc::string(host)) {}

  Status Echo(ServerContext* context, const EchoRequest* request,
              EchoResponse* response) override;

  Status CheckClientInitialMetadata(ServerContext* context,
                                    const SimpleRequest* request,
                                    SimpleResponse* response) override;

  // Unimplemented is left unimplemented to test the returned error.

  Status RequestStream(ServerContext* context,
                       ServerReader<EchoRequest>* reader,
                       EchoResponse* response) override;

  Status ResponseStream(ServerContext* context, const EchoRequest* request,
                        ServerWriter<EchoResponse>* writer) override;

  Status BidiStream(
      ServerContext* context,
      ServerReaderWriter<EchoResponse, EchoRequest>* stream) override;

  bool signal_client() {
    std::unique_lock<std::mutex> lock(mu_);
    return signal_client_;
  }
  void ClientWaitUntilRpcStarted() { signaller_.ClientWaitUntilRpcStarted(); }
  void SignalServerToContinue() { signaller_.SignalServerToContinue(); }

 private:
  bool signal_client_;
  std::mutex mu_;
  TestServiceSignaller signaller_;
  std::unique_ptr<grpc::string> host_;
};

class CallbackTestServiceImpl
    : public ::grpc::testing::EchoTestService::ExperimentalCallbackService {
 public:
  CallbackTestServiceImpl() : signal_client_(false), host_() {}
  explicit CallbackTestServiceImpl(const grpc::string& host)
      : signal_client_(false), host_(new grpc::string(host)) {}

  experimental::ServerUnaryReactor* Echo(
      experimental::CallbackServerContext* context, const EchoRequest* request,
      EchoResponse* response) override;

  experimental::ServerUnaryReactor* CheckClientInitialMetadata(
      experimental::CallbackServerContext* context, const SimpleRequest*,
      SimpleResponse*) override;

  experimental::ServerReadReactor<EchoRequest>* RequestStream(
      experimental::CallbackServerContext* context,
      EchoResponse* response) override;

  experimental::ServerWriteReactor<EchoResponse>* ResponseStream(
      experimental::CallbackServerContext* context,
      const EchoRequest* request) override;

  experimental::ServerBidiReactor<EchoRequest, EchoResponse>* BidiStream(
      experimental::CallbackServerContext* context) override;

  // Unimplemented is left unimplemented to test the returned error.
  bool signal_client() {
    std::unique_lock<std::mutex> lock(mu_);
    return signal_client_;
  }
  void ClientWaitUntilRpcStarted() { signaller_.ClientWaitUntilRpcStarted(); }
  void SignalServerToContinue() { signaller_.SignalServerToContinue(); }

 private:
  bool signal_client_;
  std::mutex mu_;
  TestServiceSignaller signaller_;
  std::unique_ptr<grpc::string> host_;
};

}  // namespace testing
}  // namespace grpc

#endif  // GRPC_TEST_CPP_END2END_TEST_SERVICE_IMPL_H