delegate void PropertyWriter(Utf8JsonWriter writer, object? value, JsonSerializerOptions options);

static readonly Dictionary<Type, PropertyWriter> propertyWriters = new();

public static TValue GetOrAdd<TKey, TValue>(
	this IDictionary<TKey, TValue> dictionary,
	TKey key,
	Func<TValue> newValue)
		where TKey : notnull
{
	Guard.ArgumentNotNull(nameof(dictionary), dictionary);
	Guard.ArgumentNotNull(nameof(key), key);
	Guard.ArgumentNotNull(nameof(newValue), newValue);

	if (!dictionary.TryGetValue(key, out var result))
	{
		result = newValue();
		dictionary[key] = result;
	}

	return result;
}

propertyWriters.GetOrAdd(propertyType, () =>
{
	var converter = jsonSerializerOptions.GetConverter(propertyType);
	if (converter == null)
		throw new InvalidOperationException($"Could not find serializer for {propertyType.FullName}");

	var writeMethod =
		converter
			.GetType()
			.GetMethods()
			.Where(mi =>
			{
				if (mi.Name != "Write")
					return false;
				var parameters = mi.GetParameters();
				return parameters.Length == 3
					&& parameters[0].ParameterType == typeof(Utf8JsonWriter)
					&& parameters[2].ParameterType == typeof(JsonSerializerOptions);
			})
			.SingleOrDefault();

	if (writeMethod == null)
		throw new InvalidOperationException($"Could not find Write method on '{converter.GetType().FullName}' to serialize '{propertyType.FullName}'");

	return (Utf8JsonWriter writer, object? value, JsonSerializerOptions options) =>
		writeMethod.Invoke(converter, new object?[] { writer, value, options });
});