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

namespace OASystem.API.OAMethodLib
{

    #region 日期格式转换

    public class DateTimeJsonConverter : System.Text.Json.Serialization.JsonConverter<DateTime>
    {
        private readonly string Format;
        public DateTimeJsonConverter(string format)
        {
            Format = format;
        }
        public override void Write(Utf8JsonWriter writer, DateTime date, JsonSerializerOptions options)
        {
            writer.WriteStringValue(date.ToString(Format));
        }
        public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            return DateTime.ParseExact(reader.GetString(), Format, null);
        }
    }
    #endregion

    #region String null值转换（读/写）


    public class NullJsonConverter : System.Text.Json.Serialization.JsonConverter<string>
    {
        public override bool HandleNull => true;

        public override string Read(
            ref Utf8JsonReader reader,
            Type typeToConvert,
            JsonSerializerOptions options) =>
            reader.GetString() ?? "";

        public override void Write(
            Utf8JsonWriter writer,
            string value,
            JsonSerializerOptions options) =>
            writer.WriteStringValue(value ?? "");

    }

    #endregion


    #region String null值转换（读/写）


    //public class Int32JsonConverter : System.Text.Json.Serialization.JsonConverter<int?>
    //{
    //    private readonly string Format;
    //    public Int32JsonConverter(string format)
    //    {
    //        Format = format;
    //    }
    //    public override void Write(Utf8JsonWriter writer, int? value, JsonSerializerOptions options)
    //    {
    //        writer.WriteStringValue((value ?? 0).ToString());
    //    }
    //    public override int Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    //    {
    //        return Convert.ToInt32(reader.GetString()) ?? 0; 
    //    }

    //}

    #endregion

}