using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.Configuration;

using System.Diagnostics;

using System.IO;

using System.Linq;

using System.Threading;

using System.Web;

using System.Xml;

namespace HYSWare.Web

{

    public class CurVisitCount {

        public DateTime BeginTime{get;set;}

        public int Count { get; set; }

    }

    public class RequestHandler : IHttpModule

    {

        private static System.Threading.Timer timer1;

        private static System.Web.Caching.Cache _Cache;

        private int _IntervalMinute;

        public int IntervalMinute

        {

            get

            {

                string _IntervalMinuteStr = ConfigurationManager.AppSettings["IntervalMinute"];

                if (string.IsNullOrEmpty(_IntervalMinuteStr))

                {

                    _IntervalMinute = ;

                }

                else

                {

                    _IntervalMinute = Convert.ToInt32(_IntervalMinuteStr);

                }

                return _IntervalMinute;

            }

        }

        public RequestHandler()

        {

            if (_Cache == null)

            {

                _Cache = HttpContext.Current.Cache;// new System.Web.Caching.Cache();

            }

            if (timer1 == null)

            {

                var autoEvent = new AutoResetEvent(false);

                timer1 = new Timer(p => FlushData(), autoEvent, , IntervalMinute * );

                //timer1 = new System.Timers.Timer(IntervalMinute * 60000);

                //timer1.Elapsed += new System.Timers.ElapsedEventHandler(timer1_Tick);

                //timer1.AutoReset = true;//设置是执行一次（false）还是一直执行(true)；

                //timer1.Enabled = true;//是否执行System.Timers.Timer.Elapsed事件；

            }

            if (_Cache["CurVisitCount"]==null)

                _Cache["CurVisitCount"] = new CurVisitCount { BeginTime = DateTime.Now, Count =  };

            if (_Cache["VisitCount"] == null)

                _Cache["VisitCount"]="";

        }

        void IHttpModule.Dispose()

        {

        }

        void IHttpModule.Init(HttpApplication context)

        {

            context.BeginRequest += new EventHandler(context_BeginRequest);

            //context.EndRequest += new EventHandler(context_EndRequest);

        }

        void context_BeginRequest(object sender, EventArgs e)

        {

            string[] requestEx = { ".aspx",".htm", ".html"};

            HttpApplication application = (HttpApplication)sender;

            var curRequest = application.Context.Request;

            if (requestEx.Contains(curRequest.CurrentExecutionFilePathExtension)) {

            if (_Cache["CurVisitCount"] == null)

                _Cache["CurVisitCount"]=new CurVisitCount { BeginTime = DateTime.Now, Count =  };

            CurVisitCount curVisitCount = (CurVisitCount)_Cache["CurVisitCount"];

            if (curVisitCount.BeginTime.Year + curVisitCount.BeginTime.Month < DateTime.Now.Year + DateTime.Now.Month)

            {

                UpdateVisitCount(curVisitCount.BeginTime);

                curVisitCount = (CurVisitCount)_Cache["CurVisitCount"];

            }

            curVisitCount.Count += ;

            _Cache["CurVisitCount"] = curVisitCount;

            if (_Cache["VisitCountXml"] == null)

                _Cache["VisitCountXml"] = GetVisitCountInXml();

            int visitCountXml = ;

            int.TryParse(_Cache["VisitCountXml"].ToString(),out visitCountXml);

            _Cache["VisitCount"] = (visitCountXml + curVisitCount.Count).ToString();

            }

            //application.Context.Response.Write("自定义ModuleRequest开始");

        }

        private int GetVisitCountInXml()

        {

            int ret = ;

            string _VisitPath = AppDomain.CurrentDomain.BaseDirectory + "App_Data\\Xml\\VisitCountData.xml";

            XmlDocument doc = new XmlDocument();

            if (File.Exists(_VisitPath))

            {

                doc.Load(_VisitPath);

                var curNode = doc.SelectNodes("//Visit");

                foreach (XmlNode m in curNode) {

                    var countAttr = m.Attributes.GetNamedItem("VCount");

                    int v = ;

                    int.TryParse(countAttr.Value, out v);

                    ret += v;

                }

            }

            return ret;

        }

        private void UpdateVisitCount(DateTime time)

        {

            if (_Cache["CurVisitCount"] == null)

                _Cache["CurVisitCount"]= new CurVisitCount { BeginTime = DateTime.Now, Count =  };

            CurVisitCount curVisitCount = (CurVisitCount)_Cache["CurVisitCount"];

            if (curVisitCount.Count > )

            {

                string _VisitPath = AppDomain.CurrentDomain.BaseDirectory + "App_Data\\Xml\\VisitCountData.xml";

                XmlDocument doc = new XmlDocument();

                if (File.Exists(_VisitPath))

                {

                    doc.Load(_VisitPath);

                    var curNode = doc.SelectSingleNode(string.Format("//Visit[@Year='{0}' and @Month='{1}']", time.Year, time.Month));

                    if (curNode != null)

                    {

                        var countAttr = curNode.Attributes.GetNamedItem("VCount");

                        int count = ;

                        int.TryParse(countAttr.Value, out count);

                        countAttr.Value = (count + curVisitCount.Count).ToString();

                    }

                    else

                    {

                        //有文件但没有本月数据

                        XmlNode root = doc.SelectSingleNode("Visits");

                        XmlElement element1 = doc.CreateElement("Visit");

                        element1.SetAttribute("Year", time.Year.ToString());

                        element1.SetAttribute("Month", time.Month.ToString());

                        element1.SetAttribute("VCount", curVisitCount.Count.ToString());

                        root.AppendChild(element1);

                    }

                }

                else

                {

                    XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);

                    doc.AppendChild(dec);

                    //创建一个根节点（一级）

                    XmlElement root = doc.CreateElement("Visits");

                    doc.AppendChild(root);

                    //创建节点（二级）

                    XmlElement element1 = doc.CreateElement("Visit");

                    element1.SetAttribute("Year", time.Year.ToString());

                    element1.SetAttribute("Month", time.Month.ToString());

                    element1.SetAttribute("VCount", curVisitCount.ToString());

                    root.AppendChild(element1);

                }

                doc.Save(_VisitPath);

                _Cache["VisitCountXml"] = GetVisitCountInXml();

                _Cache["VisitCount"] = _Cache["VisitCountXml"];

                _Cache["CurVisitCount"] = new CurVisitCount { BeginTime = DateTime.Now, Count =  };

            }

        }

        void FlushData()

        {

            UpdateVisitCount(DateTime.Now);

        }

        //private void timer1_Tick(object sender, EventArgs e)

        //{

        //    UpdateVisitCount(DateTime.Now);

        //}

    }

}