/*******************************************************************************
 * Copyright(c) 2012 dongke All rights reserved. / Confidential
 * 类的信息：
 *      1.程序名称：OutputLog.cs
 *      2.功能描述：系统客户端错误日志输出类
 * 编辑履历：
 *      作者            日期                版本            修改内容
 *      欧阳涛          2012/06/07          1.00            新建
 *******************************************************************************/

using System;
using System.IO;

namespace Dongke.IBOSS.PRD.Basics.Library
{
    #region 日志类型枚举
    /// <summary>
    /// 输出本地日志的类型
    /// </summary>
    public enum LogPriority
    {
        /// <summary>
        /// Debug测试
        /// </summary>
        Debug,
        /// <summary>
        /// 消息
        /// </summary>
        Information,
        /// <summary>
        /// 警告
        /// </summary>
        Warning,
        /// <summary>
        /// 错误
        /// </summary>
        Error,
    }
    #endregion
    public class OutputLog
    {
        #region 变量定义
        private const int DELETE_FILE_PERIOD = -30;         // 日志文件删除周期，单位：天
        #endregion

        #region 公开方法/属性
        /// <summary>
        /// 日志文件写入方法
        /// </summary>
        /// <param name="priority">日志级别</param>
        /// <param name="fileName">出现错误文件名</param>
        /// <param name="methodName">出现错误方法</param>
        /// <param name="message">错误内容</param>
        public static void Trace(LogPriority priority, string fileName,
                            string methodName, string message)
        {
            // 日志文件的路径
            string logFilePath = AppDomain.CurrentDomain.BaseDirectory+ "Log\\" + priority + "\\";

            // 消息写入日志文件
            TraceLog(priority, fileName, methodName, message, logFilePath);
        }
        #endregion

        #region 私有方法/函数
        /// <summary>
        /// 写日志文件方法
        /// </summary>
        /// <param name="priority">日志级别</param>
        /// <param name="bytes">字节</param>
        /// <param name="logFilePath">日志路径</param>
        /// <param name="logFileName">日志文件名</param>
        private static void TraceLog(LogPriority priority, byte[] bytes, string logFilePath, string logFileName)
        {
            try
            {
                // 日志文件存放的路径不存在，创建路径
                if (!Directory.Exists(logFilePath))
                {
                    Directory.CreateDirectory(logFilePath);
                }

                // 日志文件名
                string logFile = logFilePath + logFileName;

                // 写入日志文本
                File.WriteAllBytes(logFile, bytes);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 书写错误日志
        /// </summary>
        /// <param name="priority">日志级别</param>
        /// <param name="fileName">错误的源文件名</param>
        /// <param name="methodName">错误的源方法</param>
        /// <param name="message">错误消息</param>
        /// <param name="logFilePath">错误日志路径</param>
        public static void TraceLog(LogPriority priority, string fileName,
                                                    string methodName, string message, string logFilePath)
        {
            try
            {
                // 日志文件存放的路径不存在，创建路径
                if (!Directory.Exists(logFilePath))
                {
                    Directory.CreateDirectory(logFilePath);
                }

                // 文件名
                string logFile =
                    logFilePath + DateTime.Now.ToString("yyyy-MM-dd") + ".log";

                // 文件名不存在的情况下，删除旧文件
                if (!File.Exists(logFile))
                {
                    // 旧文件删除
                    //DeleteLogFile(logFilePath);
                }

                // 把错误消息写入日志文件
				System.Text.StringBuilder writeMessage = new System.Text.StringBuilder();
				//writeMessage.AppendLine();
				writeMessage.AppendLine("---------------------------------------------------------------------------");
                writeMessage.Append(GetLogPriority(priority).PadRight(14, ' '));
                writeMessage.Append(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss").PadRight(14, ' '));
                writeMessage.Append(fileName.PadRight(20, ' ') + " ");
				writeMessage.Append(methodName.PadRight(20, ' ') + " ");
				writeMessage.AppendLine();
				writeMessage.Append(message);
				writeMessage.AppendLine();
				writeMessage.AppendLine("---------------------------------------------------------------------------");

                // 日志文件写入
                WriteLogFile(priority, writeMessage.ToString(), logFile);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 写日志方法
        /// </summary>
        /// <param name="priority">日志级别</param>
        /// <param name="message">日志消息</param>
        /// <param name="fileName">写入文件名</param>
        private static void WriteLogFile(LogPriority priority, string message, string fileName)
        {
            try
            {
                StreamWriter swStreamWriter = File.AppendText(fileName);
                swStreamWriter.WriteLine(message);
                swStreamWriter.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 删除非法日志文件和过时的日志文件
        /// </summary>
        /// <param name="logFilePath">日志文件路径</param>
        private static void DeleteLogFile(string logFilePath)
        {
            try
            {
                // 日志文件夹里面的所有的日志文件的取得
                DirectoryInfo diDirectoryInfo = new DirectoryInfo(logFilePath);
                FileInfo[] fiFileInfo = diDirectoryInfo.GetFiles();

                // 旧文件删除
                string strLogFile = string.Empty;
                foreach (FileInfo fileInfo in fiFileInfo)
                {
                    strLogFile = fileInfo.Name.Remove(fileInfo.Name.LastIndexOf('.'));

                    DateTime? datDateTime;
                    bool bolCheckValid = IsValidDate(strLogFile, out datDateTime);
                    if (!bolCheckValid)
                    {
                        // 无效的文件删除
                        File.Delete(fileInfo.FullName);
                    }
                    else
                    {
                        // 旧文件的删除
                        if (datDateTime < DateTime.Now.AddDays(DELETE_FILE_PERIOD))
                        {
                            File.Delete(fileInfo.FullName);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 取得日志的级别
        /// </summary>
        /// <param name="priority">日志级别枚举</param>
        /// <returns></returns>
        private static string GetLogPriority(LogPriority priority)
        {
            try
            {
                string strLogPriority = string.Empty;
                switch (priority)
                {
                    case LogPriority.Debug:
                        strLogPriority = "[DEBUG]";
                        break;
                    case LogPriority.Information:
                        strLogPriority = "[INFORMATION]";
                        break;
                    case LogPriority.Error:
                        strLogPriority = "[ERROR]";
                        break;
                    case LogPriority.Warning:
                        strLogPriority = "[WARNING]";
                        break;
                    default:
                        break;
                }
                return strLogPriority;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion
        public static bool IsValidDate(string strDateTime, out DateTime? dateTime)
        {
            DateTime returnDatetime;
            if (DateTime.TryParse(strDateTime, out returnDatetime))
            {
                dateTime = returnDatetime;
                return true;
            }
            else
            {
                dateTime = null;
                return false;
            }
        }
    }
}