#ifndef SIGNER_INFO_HPP_9K6GXK4R
#define SIGNER_INFO_HPP_9K6GXK4R

#include <vanetza/security/v2/basic_elements.hpp>
#include <vanetza/security/v2/public_key.hpp>
#include <boost/variant/recursive_wrapper.hpp>
#include <boost/variant/variant.hpp>
#include <cstddef>
#include <cstdint>
#include <list>

namespace vanetza
{
namespace security
{
namespace v2
{

struct Certificate;

/// described in TS 103 097 v1.2.1, section 4.2.11
enum class SignerInfoType : uint8_t
{
    Self = 0,                                   // nothing -> nullptr_t
    Certificate_Digest_With_SHA256 = 1,         // HashedId8
    Certificate = 2,                            // Certificate
    Certificate_Chain = 3,                      // std::list<Certificate>
    Certificate_Digest_With_Other_Algorithm = 4 // CertificateDigestWithOtherAlgorithm
};

/// described in TS 103 097 v1.2.1, section 4.2.10
struct CertificateDigestWithOtherAlgorithm
{
    PublicKeyAlgorithm algorithm;
    HashedId8 digest;
};

/// described in TS 103 097 v1.2.1, section 4.2.10
using SignerInfo = boost::variant<
    std::nullptr_t,
    HashedId8,
    boost::recursive_wrapper<Certificate>,
    std::list<Certificate>,
    CertificateDigestWithOtherAlgorithm
>;

/**
 * \brief Determines SignerInfoType of SignerInfo
 * \param SignerInfo
 * \return SignerInfoType
 */
SignerInfoType get_type(const SignerInfo&);

/**
 * \brief Calculates size of an CertificateDigestWithOtherAlgorithm
 * \param CertificateDigestWithOtherAlgorithm
 * \return number of octets needed to serialize the CertificateDigestWithOtherAlgorithm
 */
size_t get_size(const CertificateDigestWithOtherAlgorithm&);

/**
 * \brief Calculates size of an SignerInfo
 * \param SignerInfo
 * \return number of octets needed to serialize the SignerInfo
 */
size_t get_size(const SignerInfo&);

/**
 * \brief Serializes an CertificateDigestWithOtherAlgorithm into a binary archive
 */
void serialize(OutputArchive&, const CertificateDigestWithOtherAlgorithm&);

/**
 * \brief Serializes an SignerInfo into a binary archive
 */
void serialize(OutputArchive&, const SignerInfo&);

/**
 * \brief Deserializes an CertificateDigestWithOtherAlgorithm from a binary archive
 * \param archive with a CertificateDigestWithOtherAlgorithm at the beginning
 * \param CertificateDigestWithOtherAlgorithm to deserialize
 * \return size of the deserialized CertificateDigestWithOtherAlgorithm
 */
size_t deserialize(InputArchive&, CertificateDigestWithOtherAlgorithm&);

/**
 * \brief Deserializes an SignerInfo from a binary archive
 * \param archive with a SignerInfo at the beginning
 * \param SignerInfo to deserialize
 * \return size of the deserialized SignerInfo
 */
size_t deserialize(InputArchive&, SignerInfo&);

/**
 * \brief Deserialize SignerInfo of a Certificate from a binary archive
 * This function rejects SignerInfo types which are invalid for certificates.
 * \param ar archive with a (legal) SignerInfo at the beginning
 * \param info SignerInfo to deserialize
 * \return size of the deserialized SignerInfo
 */
size_t deserialize_certificate_signer(InputArchive& ar, SignerInfo& info);

} // namespace v2
} // namespace security
} // namespace vanetza

#endif /* SIGNER_INFO_HPP_9K6GXK4R */