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#include <memory>
#include <sstream>

#include <gflags/gflags.h>
#include <grpc++/channel.h>
#include <grpc++/client_context.h>
#include <grpc/grpc.h>
#include <grpc/support/log.h>
#include "src/proto/grpc/testing/empty.grpc.pb.h"
#include "src/proto/grpc/testing/messages.grpc.pb.h"
#include "src/proto/grpc/testing/test.grpc.pb.h"
#include "test/cpp/util/create_test_channel.h"
#include "test/cpp/util/test_config.h"

DEFINE_int32(server_control_port, 0, "Server port for control rpcs.");
DEFINE_int32(server_retry_port, 0, "Server port for testing reconnection.");
DEFINE_string(server_host, "127.0.0.1", "Server host to connect to");

using grpc::Channel;
using grpc::ClientContext;
using grpc::CreateTestChannel;
using grpc::Status;
using grpc::testing::Empty;
using grpc::testing::ReconnectInfo;
using grpc::testing::ReconnectService;

int main(int argc, char** argv) {
  grpc::testing::InitTest(&argc, &argv, true);
  GPR_ASSERT(FLAGS_server_control_port);
  GPR_ASSERT(FLAGS_server_retry_port);

  std::ostringstream server_address;
  server_address << FLAGS_server_host << ':' << FLAGS_server_control_port;
  std::unique_ptr<ReconnectService::Stub> control_stub(
      ReconnectService::NewStub(
          CreateTestChannel(server_address.str(), false)));
  ClientContext start_context;
  Empty empty_request;
  Empty empty_response;
  Status start_status =
      control_stub->Start(&start_context, empty_request, &empty_response);
  GPR_ASSERT(start_status.ok());

  gpr_log(GPR_INFO, "Starting connections with retries.");
  server_address.str("");
  server_address << FLAGS_server_host << ':' << FLAGS_server_retry_port;
  std::shared_ptr<Channel> retry_channel =
      CreateTestChannel(server_address.str(), true);
  // About 13 retries.
  const int kDeadlineSeconds = 540;
  // Use any rpc to test retry.
  std::unique_ptr<ReconnectService::Stub> retry_stub(
      ReconnectService::NewStub(retry_channel));
  ClientContext retry_context;
  retry_context.set_deadline(std::chrono::system_clock::now() +
                             std::chrono::seconds(kDeadlineSeconds));
  Status retry_status =
      retry_stub->Start(&retry_context, empty_request, &empty_response);
  GPR_ASSERT(retry_status.error_code() == grpc::StatusCode::DEADLINE_EXCEEDED);
  gpr_log(GPR_INFO, "Done retrying, getting final data from server");

  ClientContext stop_context;
  ReconnectInfo response;
  Status stop_status =
      control_stub->Stop(&stop_context, empty_request, &response);
  GPR_ASSERT(stop_status.ok());
  GPR_ASSERT(response.passed() == true);
  return 0;
}