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

namespace YY.SZYD.Shop.Common.Utils
{
	public static class JsonHelper
	{
		private static JsonSerializerSettings _jsonSettings;

		static JsonHelper()
		{
			IsoDateTimeConverter datetimeConverter = new IsoDateTimeConverter();
			datetimeConverter.DateTimeFormat = "yyyy-MM-dd HH:mm:ss";

			_jsonSettings = new JsonSerializerSettings();
			_jsonSettings.MissingMemberHandling = Newtonsoft.Json.MissingMemberHandling.Ignore;
			_jsonSettings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
			_jsonSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
			_jsonSettings.Converters.Add(datetimeConverter);
		}

		/// <summary>
		/// 将指定的对象序列化成 JSON 数据。
		/// </summary>
		/// <param name="obj">要序列化的对象。</param>
		/// <returns></returns>
		public static string ToJson(this object obj)
		{
			try
			{
				if (null == obj)
					return null;

				return JsonConvert.SerializeObject(obj, Formatting.None, _jsonSettings);
			}
			catch (Exception ex)
			{
				Logging.LogManager.Error(new Logging.ExceptionLogInfo()
				{
					ExceptionClassName = "YY.SZYD.Shop.Common.Utils.JsonHelper",
					ExceptionMethod = "ToJson",
					ExceptionNote = "Json序列化出错",
					RequestInfo = obj.GetType().FullName,
				},
				ex);

				return null;
			}
		}

		/// <summary>
		/// 将指定的 JSON 数据反序列化成指定对象。
		/// </summary>
		/// <typeparam name="T">对象类型。</typeparam>
		/// <param name="json">JSON 数据。</param>
		/// <returns></returns>
		public static T FromJson<T>(this string json)
		{
			try
			{
				return JsonConvert.DeserializeObject<T>(json, _jsonSettings);
			}
			catch (Exception ex)
			{
				Logging.LogManager.Error(new Logging.ExceptionLogInfo()
				{
					ExceptionClassName = "YY.SZYD.Shop.Common.Utils.JsonHelper",
					ExceptionMethod = "ToJson",
					ExceptionNote = "Json序列化出错",
					RequestInfo = json,
				},
				ex);

				return default(T);
			}
		}
	}
}