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#ifndef GRPC_INTERNAL_CPP_SERVER_DEFAULT_HEALTH_CHECK_SERVICE_H
#define GRPC_INTERNAL_CPP_SERVER_DEFAULT_HEALTH_CHECK_SERVICE_H

#include <mutex>

#include <grpc++/health_check_service_interface.h>
#include <grpc++/impl/codegen/service_type.h>
#include <grpc++/support/byte_buffer.h>

namespace grpc {

// Default implementation of HealthCheckServiceInterface. Server will create and
// own it.
class DefaultHealthCheckService final : public HealthCheckServiceInterface {
 public:
  // The service impl to register with the server.
  class HealthCheckServiceImpl : public Service {
   public:
    explicit HealthCheckServiceImpl(DefaultHealthCheckService* service);

    Status Check(ServerContext* context, const ByteBuffer* request,
                 ByteBuffer* response);

   private:
    const DefaultHealthCheckService* const service_;
    RpcServiceMethod* method_;
  };

  DefaultHealthCheckService();
  void SetServingStatus(const grpc::string& service_name,
                        bool serving) override;
  void SetServingStatus(bool serving) override;
  enum ServingStatus { NOT_FOUND, SERVING, NOT_SERVING };
  ServingStatus GetServingStatus(const grpc::string& service_name) const;
  HealthCheckServiceImpl* GetHealthCheckService();

 private:
  mutable std::mutex mu_;
  std::map<grpc::string, bool> services_map_;
  std::unique_ptr<HealthCheckServiceImpl> impl_;
};

}  // namespace grpc

#endif  // GRPC_INTERNAL_CPP_SERVER_DEFAULT_HEALTH_CHECK_SERVICE_H