// influenced by NodaTime.Serialization.Protobuf/NodaExtensions.cs ToProtobufDuration etc
// and NodaTime.Serialization.Protobuf/ProtobufExtensions.cs ToNodaDuration etc
/// <summary>
/// Registers protobuf-net serialization surrogates for all supported NodaTime primitives.
/// </summary>
/// <param name="model">The model to extend (<see cref="RuntimeTypeModel.Default"/> is assumed if it is <c>null</c>)</param>.
/// <returns>The model instance.</returns>
public static RuntimeTypeModel AddNodaTime(this RuntimeTypeModel model)
{
model ??= RuntimeTypeModel.Default;
// use surrogates for Duration and Instant - we already have good support for these
model.SetSurrogate <NodaTime.Duration, WellKnownTypes.Duration>(ToProtoBufDuration, ToNodaTimeDuration)
.SetSurrogate <NodaTime.Instant, WellKnownTypes.Timestamp>(ToProtoBufTimestamp, ToNodaTimeInstant);
// the enum has matching values; can just configure the names
Add(model, typeof(NodaTime.IsoDayOfWeek), ".google.type.DayOfWeek", "google/type/dayofweek.proto", null);
// use custom serializer for LocalTime/LocalDate
Add(model, typeof(NodaTime.LocalDate), ".google.type.Date", "google/type/date.proto", typeof(NodaTimeSerializers));
Add(model, typeof(NodaTime.LocalTime), ".google.type.TimeOfDay", "google/type/timeofday.proto", typeof(NodaTimeSerializers));
return(model);
