using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;

namespace EShangApi.Helper
{
    public class JsonHelper
    {
        /// <summary>
        /// 将对象序列化为JSON格式
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        private static string JsonSerializer(object obj)
        {
            var jss = new JavaScriptSerializer();
            return jss.Serialize(obj);
        }

        /// <summary>
        /// 返回状态的Json处理
        /// </summary>
        /// <param name="code"></param>
        /// <param name="msg"></param>
        /// <returns></returns>
        private static string GetReturnStatusJsonStr(int code, string msg, string data = null)
        {
            string json = "[{\"Result_Code\":#code#,\"Result_Desc\":\"#msg#\",\"Result_Data\":\"#data#\"}]";
            json = json.Replace("#code#", code.ToString());
            json = json.Replace("#msg#", msg);
            json = json.Replace("#data#", data);
            return json;
        }

        /// <summary>
        /// 把json字符串转成对象
        /// </summary>
        /// <typeparam name="T">对象</typeparam>
        /// <param name="data">json字符串</param> 
        public static T Deserialize<T>(string data)
        {
            JavaScriptSerializer json = new JavaScriptSerializer();
            return json.Deserialize<T>(data);
        }

        /// <summary>
        /// Json数据分页
        /// </summary>
        /// <typeparam name="T">分页对象</typeparam>
        /// <param name="obj"></param>
        /// <param name="pageCount">分页个数</param>
        /// <param name="pageIndex">当前页码</param>
        /// <returns></returns>
        //private string GetPageJson<T>(IEnumerable<T> obj, int pageCount, int pageIndex)
        //{
        //    string retJson = (100).ToString();
        //    var enumerable = obj as List<T> ?? obj.ToList();
        //    if (enumerable.Count > 0)
        //    {
        //        retJson = "{\"count\":#count#,\"items\":#data#}";
        //        string dataStr = "";
        //        var data = enumerable.ToList().Skip((pageIndex - 1) * pageCount).Take((pageCount));
        //        if (data.Any())
        //        {
        //            dataStr = JsonSerializer(data);
        //            retJson = retJson.Replace("#count#", data.Count().ToString(CultureInfo.InvariantCulture));
        //            retJson = retJson.Replace("#data#", dataStr);
        //        }
        //        else
        //        {
        //            retJson = GetReturnStatusJsonStr((int)EnumType.ReturnStatus.NoData, "没有数据");
        //        }
        //    }
        //    else
        //    {
        //        retJson = GetReturnStatusJsonStr((int)EnumType.ReturnStatus.NoData, "没有数据");
        //    }
        //    return retJson;
        //}
    }

}