using System;
using Newtonsoft.Json;

namespace EShang.Common
{
    /// <summary>
    /// 
    /// </summary>
    public class CusJsonConverter : JsonConverter
    {
        /// <summary>
        /// 限定转化类型
        /// </summary>
        /// <param name="objectType"></param>
        /// <returns></returns>
        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(int) || objectType == typeof(decimal);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="objectType"></param>
        /// <param name="existingValue"></param>
        /// <param name="serializer"></param>
        /// <returns></returns>
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Integer)
            {
                return Convert.ToInt32(reader.Value);
            }
            else if (reader.TokenType == JsonToken.Float)
            {
                return Convert.ToDouble(reader.Value);
            }

            throw new JsonSerializationException($"Unexpected token {reader.TokenType} when parsing {objectType.Name}.");
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            if (value is int)
            {
                writer.WriteValue((int)value);
            }
            else if (value is decimal)
            {
                writer.WriteValue((decimal)value);
            }
            else
            {
                throw new JsonSerializationException($"Unexpected value when writing {value?.GetType().Name}.");
            }
        }
    }


}