using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace Iceshrimp.Backend.Core.Federation.ActivityStreams;

public static class ASSerializer {
	public class ListSingleObjectConverter<T> : JsonConverter {
		public override bool CanWrite => false;

		public override bool CanConvert(Type objectType) {
			return true;
		}

		public override object? ReadJson(JsonReader     reader, Type objectType, object? existingValue,
		                                 JsonSerializer serializer) {
			if (reader.TokenType == JsonToken.StartArray) {
				var obj  = JArray.Load(reader);
				var list = obj.ToObject<List<T?>>();
				return list == null || list.Count == 0 ? null : list[0];
			}

			if (reader.TokenType == JsonToken.StartObject) {
				var obj = JObject.Load(reader);
				return obj.ToObject<T?>();
			}

			return null;
		}

		public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer) {
			throw new NotImplementedException();
		}
	}
}