#pragma once

#include "envoy/network/connection.h"

#include "envoy/network/hash_policy.h"

#include "envoy/type/v3/hash_policy.pb.h"

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

namespace Envoy {

namespace Network {

/**

 * Implementation of HashPolicy that reads from the proto TCP proxy config.

 */

class HashPolicyImpl : public Network::HashPolicy {

public:

  explicit HashPolicyImpl(const absl::Span<const envoy::type::v3::HashPolicy* const>& hash_policy);

  // Network::HashPolicy

  absl::optional<uint64_t> generateHash(const Network::Connection& connection) const override;

  class HashMethod {

  public:

    virtual absl::optional<uint64_t> evaluate(const Network::Connection& connection) const PURE;

  };

  using HashMethodPtr = std::unique_ptr<HashMethod>;

private:

  HashMethodPtr hash_impl_;

};

} // namespace Network

} // namespace Envoy