using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using YiSha.Util.Extension;

namespace YiSha.Util
{
    #region JsonHelper
    public static class JsonHelper
    {
        public static T ToObject<T>(this string Json)
        {
            Json = Json.Replace("&nbsp;", "");
            return Json == null ? default(T) : JsonConvert.DeserializeObject<T>(Json);
        }

        public static JObject ToJObject(this string Json)
        {
            return Json == null ? JObject.Parse("{}") : JObject.Parse(Json.Replace("&nbsp;", ""));
        }
    }
    #endregion

    #region JsonConverter
    /// <summary>
    /// Json数据返回到前端js的时候，把数值很大的long类型转成字符串
    /// </summary>
    public class StringJsonConverter : JsonConverter
    {
        public StringJsonConverter() { }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            return reader.Value.ParseToLong();
        }

        public override bool CanConvert(Type objectType)
        {
            return true;
        }

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

    /// <summary>
    /// DateTime类型序列化的时候，转成指定的格式
    /// </summary>
    public class DateTimeJsonConverter : JsonConverter
    {
        public DateTimeJsonConverter() { }

        public override bool CanConvert(Type objectType)
        {
            return true;
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            return reader.Value.ParseToString().ParseToDateTime();
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            if (value == null)
            {
                writer.WriteNull();
                return;
            }
            DateTime? dt = value as DateTime?;
            if (dt == null)
            {
                writer.WriteNull();
                return;
            }
            writer.WriteValue(dt.Value.ToString("yyyy-MM-dd HH:mm:ss"));
        }
    }
    #endregion
}
