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

namespace StellaOps.Notify.Models;

internal sealed class Iso8601DurationConverter : JsonConverter<TimeSpan>
{
    public override TimeSpan Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        if (reader.TokenType is JsonTokenType.String)
        {
            var value = reader.GetString();
            if (!string.IsNullOrWhiteSpace(value))
            {
                return XmlConvert.ToTimeSpan(value);
            }
        }

        throw new JsonException("Expected ISO 8601 duration string.");
    }

    public override void Write(Utf8JsonWriter writer, TimeSpan value, JsonSerializerOptions options)
    {
        var normalized = XmlConvert.ToString(value);
        writer.WriteStringValue(normalized);
    }
}