using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

using CommonLib;

namespace Lskj.Main
{
    /// <summary>
    /// 获取系统事件
    /// </summary>
    public class ServerTimer
    {
        private static DateTime m_CurTime = DateTime.Now;

        private static Timer m_runTmr;

        public static void StartTimer()
        {
            if (m_runTmr != null)

            QueryTime();
            m_runTmr = new Timer();
            m_runTmr.Tag = 0;
            m_runTmr.Tick += new EventHandler(OnTimer);
            m_runTmr.Interval = 1000;
            m_runTmr.Start();
            
        }

        public static DateTime ServerTime
        {
            get { return m_CurTime; }
        }

        private static void OnTimer(object sender, EventArgs e)
        {
            m_CurTime = m_CurTime.AddSeconds(1);
            int count = (int)m_runTmr.Tag;
            count++;
            
            //暂定30秒查询一次
            if (count > 30)
            {
                count = 0;
                QueryTime();
            }
            m_runTmr.Tag = count;
        }

        /// <summary>
        /// 查询服务器时间，并查询登录表记录，没记录则强制退出
        /// </summary>
        private static void QueryTime()
        {
            try
            {
                string strSql = string.Format("select getdate() as cnt from p_LoginHostInfotab where HostName='{0}'", ERPInfo.Instance.WSName);
                using (SqlDataReader dr = SqlHelper.ExecuteReader(CommandType.Text, strSql, null))
                {
                    if (dr.Read())
                    {
                        m_CurTime = DateTime.Parse(dr["cnt"].ToString());
                    }
                    else
                    {
                        //掉线
                        //MessageBox.Show("你已经被强制下线.");
                        //Application.Exit();
                    }
                }
            }
            catch (Exception ex)
            {
                PubUtil.WriteLog(ex.Message);
            }
        }
    }
}