using System;
using System.Configuration;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Configuration;
using System.Web.Mvc;
using System.Web.Script.Serialization;

namespace WX.CRM.WebHelper
{
    public class JsonHelper
    {
        public static T JsonDivertToObj<T>(string json)
        {
            JavaScriptSerializer script = new JavaScriptSerializer();
            T dic = script.Deserialize<T>(json);
            return dic;
        }

        public static string ObjDivertToJson(object obj)
        {
            ScriptingJsonSerializationSection section = ConfigurationManager.GetSection("system.web.extensions/scripting/webServices/jsonSerialization") as ScriptingJsonSerializationSection;

            JavaScriptSerializer script = new JavaScriptSerializer();
            script.MaxJsonLength = section != null ? section.MaxJsonLength : int.MaxValue;
            string json = script.Serialize(obj);
            return json;
        }
    }

    public class ConfigurableJsonResult : JsonResult
    {
        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }
            if (JsonRequestBehavior == JsonRequestBehavior.DenyGet &&
                String.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
            {
                throw new InvalidOperationException("This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet.");
            }

            HttpResponseBase response = context.HttpContext.Response;

            if (!String.IsNullOrEmpty(ContentType))
            {
                response.ContentType = ContentType;
            }
            else
            {
                response.ContentType = "application/json";
            }
            if (ContentEncoding != null)
            {
                response.ContentEncoding = ContentEncoding;
            }
            if (Data != null)
            {
                JavaScriptSerializer serializer = new JavaScriptSerializer();

                ScriptingJsonSerializationSection section = ConfigurationManager.GetSection("system.web.extensions/scripting/webServices/jsonSerialization") as ScriptingJsonSerializationSection;

                if (section != null)
                {
                    serializer.MaxJsonLength = section.MaxJsonLength;
                    serializer.RecursionLimit = section.RecursionLimit;
                }
                else
                {
                    serializer.MaxJsonLength = int.MaxValue;
                }

                var str = serializer.Serialize(Data);
                str = Regex.Replace(str, @"\\/Date\((\d+)\)\\/", match =>
                {
                    DateTime dt = new DateTime(1970, 1, 1);
                    dt = dt.AddMilliseconds(long.Parse(match.Groups[1].Value));
                    dt = dt.ToLocalTime();
                    return dt.ToString("yyyy-MM-dd HH:mm:ss");
                });

                response.Write(str);
            }
        }
    }
}