using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

namespace Bowin.Web.Controls.Mvc
{
    public static class ControlHelper
    {
        static System.Collections.Concurrent.ConcurrentDictionary<HttpContext, IList<string>> scriptRegisterCache;
        static ControlHelper()
        {
            scriptRegisterCache = new System.Collections.Concurrent.ConcurrentDictionary<HttpContext, IList<string>>();
            scriptRegisterCache.TryAdd(HttpContext.Current, new List<string>());
        }

        public static bool IsRegisterScript(this HttpContext httpContext, string scriptKey)
        {  
            return GetRegisterKeyList(httpContext).Contains(scriptKey);
        }

        public static void RegisterScript(this HttpContext httpContext, string scriptKey)
        {
            if (IsRegisterScript(httpContext, scriptKey))
            {
                throw new Exception(string.Format("当前HttpContext已经脚本key:{0}", scriptKey));
            }
            GetRegisterKeyList(httpContext).Add(scriptKey);
        }

        public static IList<string> GetRegisterKeyList(this HttpContext httpContext)
        {
            IList<string> scriptKeyList = new List<string>();
            var isRegisterContext = scriptRegisterCache.TryGetValue(httpContext, out scriptKeyList);
            if (!isRegisterContext)
            {
                scriptRegisterCache.TryAdd(HttpContext.Current, new List<string>());
                scriptKeyList = new List<string>();
            }

            return scriptKeyList;
        }
    }
}