#region

using System;
using System.IO;
using System.Text;
using System.Windows.Forms;

#endregion

namespace CSFrameworkV5.Common
{
    /// <summary>
    ///     系统异常日志，存放本地文件
    /// </summary>
    public class LogLocalException : ILogUserOperate
    {
        private static LogLocalException _Instance;
        private string _LogFile;
        private int ITEM_COUNT = 3; //每行字符的项目数
        private string SEPERATOR = " | "; //分隔符
        private int TIME_INDEX = 0; //时间部分所在每行的序号

        public LogLocalException(string file)
        {
            _LogFile = file;
        }

        public static LogLocalException Log
        {
            get
            {
                if (_Instance == null)
                {
                    var logFile = Application.StartupPath +
                                  Globals.DEF_LOCAL_LOG;
                    _Instance = new LogLocalException(logFile);
                }

                return _Instance;
            }
        }

        #region IOperateLog Members

        public void WriteLog(LogTypeSystem type, string content)
        {
            WriteLog(type.ToStringEx() + ":" + content);
        }

        public void WriteLog(LogTypeSystem type, string content,
            string formName, string formCaption, string menuName)
        {
            //打开窗体不写入本地日志
        }

        public void ClearLog(string user, DateTime beginDate, DateTime endDate)
        {
            ClearLog(beginDate, endDate);
        }

        public void WriteLog(string content)
        {
            try
            {
                if (string.IsNullOrEmpty(content)) return;

                content = content.Replace("\r", " "); //去掉回车符
                content = content.Replace("\n", " "); //去掉新行

                //
                //日志格式：时间 | 日志内容 | 当前用户 
                //    举例：2013-08-02 18:34:56 | 未将对象引用实例. | admin 
                //
                var time = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
                var line =
                    time + SEPERATOR + content + SEPERATOR + "\r\n"; //断行符

                //写入文件
                File.AppendAllText(_LogFile, line, Encoding.UTF8);
            }
            catch
            {
                //不处理异常
            }
        }

        public void ClearLog(DateTime beginDate, DateTime endDate)
        {
            try
            {
                var lines = File.ReadAllLines(_LogFile, Encoding.UTF8);
                DateTime date;
                string[] items;
                var sb = new StringBuilder();
                foreach (var line in lines)
                {
                    items = line.Split(new[] { SEPERATOR },
                        StringSplitOptions.None);
                    if (items.Length == ITEM_COUNT)
                    {
                        //匹配时间
                        if (DateTime.TryParse(items[TIME_INDEX], out date))
                            if (date < beginDate || date > endDate)
                                sb.AppendLine(line); //不在范围内，保留日志
                    }
                    else
                    {
                        sb.AppendLine(line);
                    }
                }

                //写入文件
                File.WriteAllText(_LogFile, sb.ToStringEx(), Encoding.UTF8);
            }
            catch
            {
                //不处理异常
            }
        }

        public void ClearAll()
        {
            try
            {
                File.WriteAllText(_LogFile, "", Encoding.UTF8);
            }
            catch
            {
                //不处理异常
            }
        }

        #endregion
    }
}