#pragma once

#include <chrono>

#include <cstdint>

#include <functional>

#include <list>

#include <map>

#include <string>

#include "envoy/config/core/v3/extension.pb.h"

#include "envoy/config/core/v3/protocol.pb.h"

#include "envoy/extensions/upstreams/http/v3/http_protocol_options.pb.h"

#include "envoy/extensions/upstreams/http/v3/http_protocol_options.pb.validate.h"

#include "envoy/http/filter.h"

#include "envoy/http/header_validator.h"

#include "envoy/server/filter_config.h"

#include "envoy/server/transport_socket_config.h"

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

#include "source/common/protobuf/message_validator_impl.h"

namespace Envoy {

namespace Extensions {

namespace Upstreams {

namespace Http {

class ProtocolOptionsConfigImpl : public Upstream::ProtocolOptionsConfig {

public:

  static absl::StatusOr<std::shared_ptr<ProtocolOptionsConfigImpl>> createProtocolOptionsConfig(

      const envoy::extensions::upstreams::http::v3::HttpProtocolOptions& options,

      Server::Configuration::ServerFactoryContext& server_context);

  static absl::StatusOr<std::shared_ptr<ProtocolOptionsConfigImpl>> createProtocolOptionsConfig(

      const envoy::config::core::v3::Http1ProtocolOptions& http1_settings,

      const envoy::config::core::v3::Http2ProtocolOptions& http2_options,

      const envoy::config::core::v3::HttpProtocolOptions& common_options,

      const absl::optional<envoy::config::core::v3::UpstreamHttpProtocolOptions> upstream_options,

      bool use_downstream_protocol, bool use_http2,

      ProtobufMessage::ValidationVisitor& validation_visitor);

  // Given the supplied cluster config, and protocol options configuration,

  // returns a unit64_t representing the enabled Upstream::ClusterInfo::Features.

  static uint64_t parseFeatures(const envoy::config::cluster::v3::Cluster& config,

                                const ProtocolOptionsConfigImpl& options);

  const Envoy::Http::Http1Settings http1_settings_;

  const envoy::config::core::v3::Http2ProtocolOptions http2_options_;

  const envoy::config::core::v3::Http3ProtocolOptions http3_options_{};

  const envoy::config::core::v3::HttpProtocolOptions common_http_protocol_options_;

  const absl::optional<envoy::config::core::v3::UpstreamHttpProtocolOptions>

      upstream_http_protocol_options_;

  using FiltersList = Protobuf::RepeatedPtrField<

      envoy::extensions::filters::network::http_connection_manager::v3::HttpFilter>;

  const FiltersList http_filters_;

  const absl::optional<const envoy::config::core::v3::AlternateProtocolsCacheOptions>

      alternate_protocol_cache_options_;

  const Envoy::Http::HeaderValidatorFactoryPtr header_validator_factory_;

  const bool use_downstream_protocol_{};

  const bool use_http2_{};

  const bool use_http3_{};

  const bool use_alpn_{};

private:

  ProtocolOptionsConfigImpl(

      const envoy::extensions::upstreams::http::v3::HttpProtocolOptions& options,

      envoy::config::core::v3::Http2ProtocolOptions validated_h2_options,

      Envoy::Http::HeaderValidatorFactoryPtr&& header_validator_factory,

      absl::optional<const envoy::config::core::v3::AlternateProtocolsCacheOptions> cache_options,

      Server::Configuration::ServerFactoryContext& server_context);

  // Constructor for legacy (deprecated) config.

  ProtocolOptionsConfigImpl(

      const envoy::config::core::v3::Http1ProtocolOptions& http1_settings,

      const envoy::config::core::v3::Http2ProtocolOptions& validated_http2_options,

      const envoy::config::core::v3::HttpProtocolOptions& common_options,

      const absl::optional<envoy::config::core::v3::UpstreamHttpProtocolOptions> upstream_options,

      bool use_downstream_protocol, bool use_http2,

      ProtobufMessage::ValidationVisitor& validation_visitor);

};

class ProtocolOptionsConfigFactory : public Server::Configuration::ProtocolOptionsFactory {

public:

  absl::StatusOr<Upstream::ProtocolOptionsConfigConstSharedPtr> createProtocolOptionsConfig(

      const Protobuf::Message& config,

      Server::Configuration::ProtocolOptionsFactoryContext& context) override {

    const auto& typed_config = MessageUtil::downcastAndValidate<

        const envoy::extensions::upstreams::http::v3::HttpProtocolOptions&>(

        config, context.messageValidationVisitor());

    return ProtocolOptionsConfigImpl::createProtocolOptionsConfig(typed_config,

                                                                  context.serverFactoryContext());

  }

  std::string category() const override { return "envoy.upstream_options"; }

  std::string name() const override {

    return "envoy.extensions.upstreams.http.v3.HttpProtocolOptions";

  }

  ProtobufTypes::MessagePtr createEmptyConfigProto() override {

    return std::make_unique<envoy::extensions::upstreams::http::v3::HttpProtocolOptions>();

  }

  ProtobufTypes::MessagePtr createEmptyProtocolOptionsProto() override {

    return std::make_unique<envoy::extensions::upstreams::http::v3::HttpProtocolOptions>();

  }

};

DECLARE_FACTORY(ProtocolOptionsConfigFactory);

} // namespace Http

} // namespace Upstreams

} // namespace Extensions

} // namespace Envoy