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#ifndef GRPC_TEST_CPP_STRESS_INTEROP_CLIENT_H
#define GRPC_TEST_CPP_STRESS_INTEROP_CLIENT_H

#include <memory>
#include <string>
#include <vector>

#include <grpc++/create_channel.h>

#include "test/cpp/interop/interop_client.h"
#include "test/cpp/util/metrics_server.h"

namespace grpc {
namespace testing {

using std::pair;
using std::vector;

// TODO(sreek): Add more test cases here in future
enum TestCaseType {
  UNKNOWN_TEST = -1,
  EMPTY_UNARY = 0,
  LARGE_UNARY = 1,
  LARGE_COMPRESSED_UNARY = 2,
  CLIENT_STREAMING = 3,
  SERVER_STREAMING = 4,
  EMPTY_STREAM = 5
};

const vector<pair<TestCaseType, grpc::string>> kTestCaseList = {
    {EMPTY_UNARY, "empty_unary"},
    {LARGE_UNARY, "large_unary"},
    {LARGE_COMPRESSED_UNARY, "large_compressed_unary"},
    {CLIENT_STREAMING, "client_streaming"},
    {SERVER_STREAMING, "server_streaming"},
    {EMPTY_STREAM, "empty_stream"}};

class WeightedRandomTestSelector {
 public:
  // Takes a vector of <test_case, weight> pairs as the input
  WeightedRandomTestSelector(const vector<pair<TestCaseType, int>>& tests);

  // Returns a weighted-randomly chosen test case based on the test cases and
  // weights passed in the constructor
  TestCaseType GetNextTest() const;

 private:
  const vector<pair<TestCaseType, int>> tests_;
  int total_weight_;
};

class StressTestInteropClient {
 public:
  StressTestInteropClient(int test_id, const grpc::string& server_address,
                          std::shared_ptr<Channel> channel,
                          const WeightedRandomTestSelector& test_selector,
                          long test_duration_secs, long sleep_duration_ms,
                          long metrics_collection_interval_secs);

  // The main function. Use this as the thread entry point.
  // qps_gauge is the Gauge to record the requests per second metric
  void MainLoop(std::shared_ptr<Gauge> qps_gauge);

 private:
  void RunTest(TestCaseType test_case);

  int test_id_;
  const grpc::string& server_address_;
  std::shared_ptr<Channel> channel_;
  std::unique_ptr<InteropClient> interop_client_;
  const WeightedRandomTestSelector& test_selector_;
  long test_duration_secs_;
  long sleep_duration_ms_;
  long metrics_collection_interval_secs_;
};

}  // namespace testing
}  // namespace grpc

#endif  // GRPC_TEST_CPP_STRESS_INTEROP_CLIENT_H