using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Questionable.Model.Questing.Converter;

public sealed class ElementIdListConverter : JsonConverter<List<ElementId>>
{
	public override List<ElementId> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
	{
		if (reader.TokenType != JsonTokenType.StartArray)
		{
			throw new JsonException();
		}
		reader.Read();
		List<ElementId> list = new List<ElementId>();
		while (reader.TokenType != JsonTokenType.EndArray)
		{
			if (reader.TokenType == JsonTokenType.Number)
			{
				list.Add(new QuestId(reader.GetUInt16()));
			}
			else
			{
				list.Add(ElementId.FromString(reader.GetString() ?? throw new JsonException()));
			}
			reader.Read();
		}
		return list;
	}

	public override void Write(Utf8JsonWriter writer, List<ElementId> value, JsonSerializerOptions options)
	{
		writer.WriteStartArray();
		foreach (ElementId item in value)
		{
			if (item is QuestId)
			{
				writer.WriteNumberValue(item.Value);
			}
			else
			{
				writer.WriteStringValue(item.ToString());
			}
		}
		writer.WriteEndArray();
	}
}