#pragma once

#include <memory>

#include <string>

#include "envoy/rds/route_config_provider.h"

#include "envoy/rds/route_config_update_receiver.h"

#include "envoy/server/factory_context.h"

#include "envoy/thread_local/thread_local.h"

#include "source/common/rds/rds_route_config_subscription.h"

namespace Envoy {

namespace Rds {

/**

 * Implementation of RouteConfigProvider that fetches the route configuration dynamically using

 * the subscription.

 */

class RdsRouteConfigProviderImpl : public RouteConfigProvider,

                                   Logger::Loggable<Logger::Id::router> {

public:

  RdsRouteConfigProviderImpl(RdsRouteConfigSubscriptionSharedPtr&& subscription,

                             Server::Configuration::ServerFactoryContext& factory_context);

  ~RdsRouteConfigProviderImpl() override;

  // RouteConfigProvider

  const absl::optional<ConfigInfo>& configInfo() const override;

  absl::Status onConfigUpdate() override;

private:

  struct ThreadLocalConfig : public ThreadLocal::ThreadLocalObject {

    ThreadLocalConfig(std::shared_ptr<const Config> initial_config)

    ConfigConstSharedPtr config_;

  };

  RdsRouteConfigSubscriptionSharedPtr subscription_;

  RouteConfigUpdatePtr& config_update_info_;

  ThreadLocal::TypedSlot<ThreadLocalConfig> tls_;

};

} // namespace Rds

} // namespace Envoy