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#include <memory>
#include <string>

#include <gflags/gflags.h>
#include <grpc++/grpc++.h>

#include "test/cpp/util/metrics_server.h"
#include "test/cpp/util/test_config.h"
#include "src/proto/grpc/testing/metrics.grpc.pb.h"
#include "src/proto/grpc/testing/metrics.pb.h"

DEFINE_string(metrics_server_address, "",
              "The metrics server addresses in the fomrat <hostname>:<port>");

using grpc::testing::EmptyMessage;
using grpc::testing::GaugeResponse;
using grpc::testing::MetricsService;
using grpc::testing::MetricsServiceImpl;

void PrintMetrics(const grpc::string& server_address) {
  gpr_log(GPR_INFO, "creating a channel to %s", server_address.c_str());
  std::shared_ptr<grpc::Channel> channel(
      grpc::CreateChannel(server_address, grpc::InsecureChannelCredentials()));

  std::unique_ptr<MetricsService::Stub> stub(MetricsService::NewStub(channel));

  grpc::ClientContext context;
  EmptyMessage message;

  std::unique_ptr<grpc::ClientReader<GaugeResponse>> reader(
      stub->GetAllGauges(&context, message));

  GaugeResponse gauge_response;
  long overall_qps = 0;
  int idx = 0;
  while (reader->Read(&gauge_response)) {
    if (gauge_response.value_case() == GaugeResponse::kLongValue) {
      gpr_log(GPR_INFO, "Gauge: %d (%s: %ld)", ++idx,
              gauge_response.name().c_str(), gauge_response.long_value());
      overall_qps += gauge_response.long_value();
    } else {
      gpr_log(GPR_INFO, "Gauge %s is not a long value",
              gauge_response.name().c_str());
    }
  }

  gpr_log(GPR_INFO, "OVERALL: %ld", overall_qps);

  const grpc::Status status = reader->Finish();
  if (!status.ok()) {
    gpr_log(GPR_ERROR, "Error in getting metrics from the client");
  }
}

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

  // Make sure server_addresses flag is not empty
  if (FLAGS_metrics_server_address.empty()) {
    gpr_log(
        GPR_ERROR,
        "Cannot connect to the Metrics server. Please pass the address of the"
        "metrics server to connect to via the 'metrics_server_address' flag");
    return 1;
  }

  PrintMetrics(FLAGS_metrics_server_address);

  return 0;
}