#pragma once

#include "envoy/config/tap/v3/common.pb.h"
#include "envoy/extensions/common/tap/v3/common.pb.h"
#include "envoy/thread_local/thread_local.h"

#include "extensions/common/tap/admin.h"
#include "extensions/common/tap/tap.h"

namespace Envoy {
namespace Extensions {
namespace Common {
namespace Tap {

/**
 * Base class for tap extension configuration. Used by all tap extensions.
 */
class ExtensionConfigBase : public ExtensionConfig, Logger::Loggable<Logger::Id::tap> {
public:
  // Extensions::Common::Tap::ExtensionConfig
  void clearTapConfig() override;
  const absl::string_view adminId() override;
  void newTapConfig(const envoy::config::tap::v3::TapConfig& proto_config,
                    Sink* admin_streamer) override;

protected:
  ExtensionConfigBase(const envoy::extensions::common::tap::v3::CommonExtensionConfig proto_config,
                      TapConfigFactoryPtr&& config_factory, Server::Admin& admin,
                      Singleton::Manager& singleton_manager, ThreadLocal::SlotAllocator& tls,
                      Event::Dispatcher& main_thread_dispatcher);
  ~ExtensionConfigBase() override;

  // All tap configurations derive from TapConfig for type safety. In order to use a common
  // extension base class (with TLS logic, etc.) we must dynamic cast to the actual tap
  // configuration type that the extension expects (and is created by the configuration factory).
  template <class T> std::shared_ptr<T> currentConfigHelper() const {
    return std::dynamic_pointer_cast<T>(tls_slot_->config_);
  }

private:
  // Holds the functionality of installing a new tap config. This is the underlying method to the
  // virtual method newTapConfig.
  void installNewTap(const envoy::config::tap::v3::TapConfig& proto_config, Sink* admin_streamer);

  struct TlsFilterConfig : public ThreadLocal::ThreadLocalObject {
    TapConfigSharedPtr config_;
  };

  const envoy::extensions::common::tap::v3::CommonExtensionConfig proto_config_;
  TapConfigFactoryPtr config_factory_;
  ThreadLocal::TypedSlot<TlsFilterConfig> tls_slot_;
  AdminHandlerSharedPtr admin_handler_;
};

} // namespace Tap
} // namespace Common
} // namespace Extensions
} // namespace Envoy