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

namespace Manager.YouTube.Util.Converters;

public class NumericJsonConverter<T> : JsonConverter<T> where T : struct, IConvertible
{
    public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        try
        {
            if (reader.TokenType == JsonTokenType.Number)
            {
                // Direct numeric value
                return (T)Convert.ChangeType(reader.GetDouble(), typeof(T));
            }

            if (reader.TokenType == JsonTokenType.String)
            {
                var str = reader.GetString();
                if (string.IsNullOrWhiteSpace(str))
                    throw new JsonException("Empty string cannot be converted to a number.");

                return (T)Convert.ChangeType(str, typeof(T));
            }

            throw new JsonException($"Unexpected token {reader.TokenType} for type {typeof(T)}.");
        }
        catch (Exception ex)
        {
            throw new JsonException($"Error converting value to {typeof(T)}.", ex);
        }
    }

    public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
    {
        writer.WriteNumberValue(Convert.ToDouble(value));
    }
}