#pragma once

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

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

#include "absl/container/flat_hash_map.h"

#include "xds/core/v3/context_params.pb.h"

namespace Envoy {

namespace Config {

// Utilities for working with context parameters.

class XdsContextParams {

public:

  /**

   * Encode resource context parameters by following the xDS transport precedence algorithm and

   * applying parameter prefixes.

   *

   * @param node_context_params node context parameters.

   * @param resource_context_params context parameters from resource locator.

   * @param client_features client feature capabilities.

   * @param extra_resource_param per-resource type well known attributes.

   * @return xds::core::v3::ContextParams encoded context parameters.

   */

  static xds::core::v3::ContextParams

  encodeResource(const xds::core::v3::ContextParams& node_context_params,

                 const xds::core::v3::ContextParams& resource_context_params,

                 const std::vector<std::string>& client_features,

                 const absl::flat_hash_map<std::string, std::string>& extra_resource_params);

  /**

   * Encode node context parameters.

   *

   * @param node reference to the local Node information.

   * @param node_context_params a list of node fields to include in context parameters.

   *

   * @return xds::core::v3::ContextParams encoded node context parameters.

   */

  static xds::core::v3::ContextParams

  encodeNodeContext(const envoy::config::core::v3::Node& node,

                    const Protobuf::RepeatedPtrField<std::string>& node_context_params);

};

} // namespace Config

} // namespace Envoy