using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace YLErp.Core.Serialization
{
    public class CustomBoolConverter : JsonConverter
    {
        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(bool) || objectType == typeof(bool?);
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.String || reader.TokenType == JsonToken.Null)
            {
                var str = reader.Value.ToString();
                if (string.IsNullOrEmpty(str))
                {
                    if (IsNullableType(objectType))
                    { 
                        return null;
                    }
                    return false;
                }
                else if(bool.TryParse(str, out var d))
                {
                    return d;
                }
            }
            return reader.ReadAsBoolean();
        }


        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            if (value == null)
            {
                writer.WriteNull();
                return;
            }

            bool bValue = (bool)value;
            writer.WriteValue(bValue);
        }


        private bool IsNullableType(Type t)
        {
            if (t.IsGenericType)
            {
                return t.GetGenericTypeDefinition() == typeof(Nullable<>);
            }
            return false;
        }
    }
}