/*
 *
 * Copyright 2015 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.
 *
 */

#include <gflags/gflags.h>
#include <iostream>
#include <memory>
#include <sstream>
#include <string>

#include <grpc/support/log.h>
#include <grpcpp/channel.h>
#include <grpcpp/client_context.h>
#include <grpcpp/create_channel.h>

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

DEFINE_string(address, "", "Address to connect to");
DEFINE_string(mode, "", "Test mode to use");

using grpc::testing::EchoRequest;
using grpc::testing::EchoResponse;

// In some distros, gflags is in the namespace google, and in some others,
// in gflags. This hack is enabling us to find both.
namespace google {}
namespace gflags {}
using namespace google;
using namespace gflags;

int main(int argc, char** argv) {
  ParseCommandLineFlags(&argc, &argv, true);
  auto stub = grpc::testing::EchoTestService::NewStub(
      grpc::CreateChannel(FLAGS_address, grpc::InsecureChannelCredentials()));

  EchoRequest request;
  EchoResponse response;
  grpc::ClientContext context;
  context.set_wait_for_ready(true);

  if (FLAGS_mode == "bidi") {
    auto stream = stub->BidiStream(&context);
    for (int i = 0;; i++) {
      std::ostringstream msg;
      msg << "Hello " << i;
      request.set_message(msg.str());
      GPR_ASSERT(stream->Write(request));
      GPR_ASSERT(stream->Read(&response));
      GPR_ASSERT(response.message() == request.message());
    }
  } else if (FLAGS_mode == "response") {
    EchoRequest request;
    request.set_message("Hello");
    auto stream = stub->ResponseStream(&context, request);
    for (;;) {
      GPR_ASSERT(stream->Read(&response));
    }
  } else {
    gpr_log(GPR_ERROR, "invalid test mode '%s'", FLAGS_mode.c_str());
    return 1;
  }

  return 0;
}