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

namespace YLErp.Serialization
{
    /// <summary>
    /// 
    /// </summary>
    public class CustomDoubleConvert : JsonConverter<double>
    {
        public override double Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            if (reader.TokenType == JsonTokenType.String || reader.TokenType == JsonTokenType.Null)
            {
                var str = reader.GetString();

                if (string.IsNullOrWhiteSpace(str) || str.Trim() == "null" || str == "NaN")
                {
                    return 0d;
                }

                if (double.TryParse(str, out var d))
                {
                    return d;
                }
            }
            return reader.GetDouble();
        }

        public override void Write(Utf8JsonWriter writer, double value, JsonSerializerOptions options)
        {
            if (double.IsNaN(value))
            {
                writer.WriteStringValue("NaN");
            }
            else if (double.IsInfinity(value))
            {
                writer.WriteNullValue();
            }
            else
            {
                writer.WriteNumberValue(value);
            }
        }

        public static readonly CustomDoubleConvert Default;

        static CustomDoubleConvert()
        {
            Default = new CustomDoubleConvert();
        }
    }

    //https://github.com/dotnet/runtime/issues/30843
    //public class NullableStructSerializer<TStruct> : JsonConverter<TStruct?> where TStruct : struct
    //{
    //    public override TStruct? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    //    {
    //        if (reader.TokenType == JsonTokenType.Null)
    //            return null;

    //        return JsonSerializer.Deserialize<TStruct>(ref reader, options);
    //    }

    //    public override void Write(Utf8JsonWriter writer, TStruct? value, JsonSerializerOptions options)
    //    {
    //        if (value == null)
    //            writer.WriteNullValue();
    //        else
    //            JsonSerializer.Serialize(writer, value.Value, options);
    //    }
    //}
}