#pragma once

#include <functional>

#include <memory>

#include "envoy/api/api.h"

#include "envoy/network/connection_handler.h"

#include "envoy/server/guarddog.h"

#include "envoy/server/listener_manager.h"

#include "envoy/server/worker.h"

#include "envoy/thread_local/thread_local.h"

#include "source/common/common/logger.h"

#include "source/server/listener_hooks.h"

namespace Envoy {

namespace Server {

// Captures a set of stat names for the workers.

struct WorkerStatNames {

  explicit WorkerStatNames(Stats::SymbolTable& symbol_table)

      : pool_(symbol_table),

        reset_high_memory_stream_(pool_.add(OverloadActionStatsNames::get().ResetStreamsCount)) {}

  Stats::StatNamePool pool_;

  Stats::StatName reset_high_memory_stream_;

};

class ProdWorkerFactory : public WorkerFactory, Logger::Loggable<Logger::Id::main> {

public:

  ProdWorkerFactory(ThreadLocal::Instance& tls, Api::Api& api, ListenerHooks& hooks)

      : tls_(tls), api_(api), stat_names_(api.rootScope().symbolTable()), hooks_(hooks) {}

  // Server::WorkerFactory

  WorkerPtr createWorker(uint32_t index, OverloadManager& overload_manager,

                         const std::string& worker_name) override;

private:

  ThreadLocal::Instance& tls_;

  Api::Api& api_;

  WorkerStatNames stat_names_;

  ListenerHooks& hooks_;

};

/**

 * A server threaded worker that wraps up a worker thread, event loop, etc.

 */

class WorkerImpl : public Worker, Logger::Loggable<Logger::Id::main> {

public:

  WorkerImpl(ThreadLocal::Instance& tls, ListenerHooks& hooks, Event::DispatcherPtr&& dispatcher,

             Network::ConnectionHandlerPtr handler, OverloadManager& overload_manager,

             Api::Api& api, WorkerStatNames& stat_names);

  // Server::Worker

  void addListener(absl::optional<uint64_t> overridden_listener, Network::ListenerConfig& listener,

                   AddListenerCompletion completion, Runtime::Loader& loader) override;

  uint64_t numConnections() const override;

  void removeListener(Network::ListenerConfig& listener, std::function<void()> completion) override;

  void removeFilterChains(uint64_t listener_tag,

                          const std::list<const Network::FilterChain*>& filter_chains,

                          std::function<void()> completion) override;

  void start(GuardDog& guard_dog, const std::function<void()>& cb) override;

  void initializeStats(Stats::Scope& scope) override;

  void stop() override;

  void stopListener(Network::ListenerConfig& listener,

                    const Network::ExtraShutdownListenerOptions& options,

                    std::function<void()> completion) override;

private:

  void threadRoutine(GuardDog& guard_dog, const std::function<void()>& cb);

  void stopAcceptingConnectionsCb(OverloadActionState state);

  void rejectIncomingConnectionsCb(OverloadActionState state);

  void resetStreamsUsingExcessiveMemory(OverloadActionState state);

  ThreadLocal::Instance& tls_;

  ListenerHooks& hooks_;

  Event::DispatcherPtr dispatcher_;

  Network::ConnectionHandlerPtr handler_;

  Api::Api& api_;

  Stats::Counter& reset_streams_counter_;

  Thread::ThreadPtr thread_;

  WatchDogSharedPtr watch_dog_;

};

} // namespace Server

} // namespace Envoy