using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BayonetTransfer.Common
{
    internal class LoggerHelper
    {
        public static string path = AppDomain.CurrentDomain.BaseDirectory;

        /// <summary>
        /// 读写锁，锁定文件写入权限，每个线程依次等待上个写入完成
        /// </summary>
        private static System.Threading.ReaderWriterLockSlim LogWriteLock = new System.Threading.ReaderWriterLockSlim();

        /// <summary>
        /// 记录文本日志
        /// </summary>
        /// <param name="LogData">日志内容</param>
        public static void WriteLogger(string LogData)
        {
            LogData = DateTime.Now.ToLongTimeString() + ":" + LogData;
            LogData = LogData.Replace("\r\n", Environment.NewLine);
            string LogName = "日志_Send" + DateTime.Now.Year.ToString() + "-" + DateTime.Now.Month.ToString() + "-" + DateTime.Now.Day.ToString() + ".log";
            WriteLogger(LogName, LogData);
        }
        /// <summary>
        /// 记录文本日志
        /// </summary>
        /// <param name="logFileName">日志文件名称</param>
        /// <param name="logData">日志内容</param>
        public static void WriteLogger(string logFileName, string logData)
        {
            try
            {
                //设置读写锁为写入模式独占资源
                //因写入模式的进入与释放在同一个代码块内，请保证在块内进入写入模式前不会触发异常，否则会因为进入与释放次数不符从而触发异常
                //请勿长时间占用读写锁否则会导致其他线程饥饿。
                LogWriteLock.EnterWriteLock();
                string filename = Path.Combine(path, "log", logFileName);
                //不存在目录则创建
                if (!Directory.Exists(Path.Combine(path, "log")))
                    Directory.CreateDirectory(Path.Combine(path, "log"));
                //不存在文件则创建
                if (!File.Exists(filename))
                {
                    File.Create(filename).Close();
                }
                using (FileStream file = new FileStream(filename, FileMode.Append, FileAccess.Write))
                {
                    using (StreamWriter sw = new StreamWriter(file))
                    {
                        sw.WriteLine(logData);
                    }
                    file.Close();
                }
            }
            catch { }
            finally
            {
                //退出写入模式，释放资源占用
                //注意释放与进入次数相同否则会触发异常
                LogWriteLock.ExitWriteLock();
            }
        }
    }
}