using System;
using Newtonsoft.Json;

namespace Kreta.Core.JsonConverter
{
    public class StringTrimConverter : JsonConverter<string>
    {
        public override string ReadJson(JsonReader reader, Type objectType, string existingValue, bool hasExistingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.String)
            {
                var value = (string)reader.Value;

                if (string.IsNullOrWhiteSpace(value))
                {
                    return null;
                }

                return value.Trim();
            }

            return null;
        }

        public override void WriteJson(JsonWriter writer, string value, JsonSerializer serializer)
        {

            if (value is null)
            {
                writer.WriteNull();
            }
            else
            {
                writer.WriteValue(value);
            }
        }
    }
}