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#ifndef GRPC_TEST_CPP_INTEROP_INTEROP_CLIENT_H
#define GRPC_TEST_CPP_INTEROP_INTEROP_CLIENT_H

#include <memory>

#include <grpc/grpc.h>
#include <grpc++/channel.h>
#include "src/proto/grpc/testing/messages.grpc.pb.h"
#include "src/proto/grpc/testing/test.grpc.pb.h"

namespace grpc {
namespace testing {

// Function pointer for custom checks.
using CheckerFn =
    std::function<void(const InteropClientContextInspector&,
                       const SimpleRequest*, const SimpleResponse*)>;

class InteropClient {
 public:
  explicit InteropClient(std::shared_ptr<Channel> channel);
  explicit InteropClient(
      std::shared_ptr<Channel> channel,
      bool new_stub_every_test_case);  // If new_stub_every_test_case is true,
                                       // a new TestService::Stub object is
                                       // created for every test case below
  ~InteropClient() {}

  void Reset(std::shared_ptr<Channel> channel);

  void DoEmpty();
  void DoLargeUnary();
  void DoLargeCompressedUnary();
  void DoPingPong();
  void DoHalfDuplex();
  void DoRequestStreaming();
  void DoResponseStreaming();
  void DoResponseCompressedStreaming();
  void DoResponseStreamingWithSlowConsumer();
  void DoCancelAfterBegin();
  void DoCancelAfterFirstResponse();
  void DoTimeoutOnSleepingServer();
  void DoEmptyStream();
  void DoStatusWithMessage();
  void DoCustomMetadata();
  // Auth tests.
  // username is a string containing the user email
  void DoJwtTokenCreds(const grpc::string& username);
  void DoComputeEngineCreds(const grpc::string& default_service_account,
                            const grpc::string& oauth_scope);
  // username the GCE default service account email
  void DoOauth2AuthToken(const grpc::string& username,
                         const grpc::string& oauth_scope);
  // username is a string containing the user email
  void DoPerRpcCreds(const grpc::string& json_key);

 private:
  class ServiceStub {
   public:
    // If new_stub_every_call = true, pointer to a new instance of
    // TestServce::Stub is returned by Get() everytime it is called
    ServiceStub(std::shared_ptr<Channel> channel, bool new_stub_every_call);

    TestService::Stub* Get();

    void Reset(std::shared_ptr<Channel> channel);

   private:
    std::unique_ptr<TestService::Stub> stub_;
    std::shared_ptr<Channel> channel_;
    bool new_stub_every_call_;  // If true, a new stub is returned by every
                                // Get() call
  };

  void PerformLargeUnary(SimpleRequest* request, SimpleResponse* response);

  /// Run \a custom_check_fn as an additional check.
  void PerformLargeUnary(SimpleRequest* request, SimpleResponse* response,
                         CheckerFn custom_checks_fn);
  void AssertOkOrPrintErrorStatus(const Status& s);
  ServiceStub serviceStub_;
};

}  // namespace testing
}  // namespace grpc

#endif  // GRPC_TEST_CPP_INTEROP_INTEROP_CLIENT_H