using System;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Questionable.Model.Questing.Converter;

public sealed class ExcelRefConverter : JsonConverter<ExcelRef>
{
	public override ExcelRef? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
	{
		return reader.TokenType switch
		{
			JsonTokenType.String => ExcelRef.FromKey(reader.GetString()), 
			JsonTokenType.Number => ExcelRef.FromRowId(reader.GetUInt32()), 
			_ => null, 
		};
	}

	public override void Write(Utf8JsonWriter writer, ExcelRef? value, JsonSerializerOptions options)
	{
		if (value == null)
		{
			writer.WriteNullValue();
			return;
		}
		if (value.Type == ExcelRef.EType.Key)
		{
			writer.WriteStringValue(value.AsKey());
			return;
		}
		if (value.Type == ExcelRef.EType.RowId)
		{
			writer.WriteNumberValue(value.AsRowId());
			return;
		}
		throw new JsonException();
	}
}