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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.Logging
{
public class SessionFileLogger : ILogger
{
#region Properties
private bool _inInSession;
private int _writeCount;
public const string FILE_SESSION_EXTENSION = "_session";
public static String DefaultLogsFolder { get; private set; }
private const int FILE_SIZE_CHECK_COUNT = 100;
/// <summary>
/// Gets or sets the maximum file size limit.
/// </summary>
public static long MaxFileSizeLimit { get; set; }
public bool Enabled { get; set; }
public String Folder { get; private set; }
public String LogFile { get; private set; }
public String Tag { get; private set; }
#endregion
#region Constructors
/// <summary>
/// Initializes the static members of the class.
/// </summary>
static SessionFileLogger()
{
DefaultLogsFolder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "Twine", "Tango", "Logs", Path.GetFileNameWithoutExtension(AppDomain.CurrentDomain.FriendlyName), "Session");
MaxFileSizeLimit = 1000000 * 10; //10 MB
}
public SessionFileLogger(String folder, String tag)
{
Folder = folder;
Tag = tag;
Directory.CreateDirectory(Folder);
Enabled = true;
_writeCount = 0;
}
public SessionFileLogger() : this(DefaultLogsFolder, Path.GetFileNameWithoutExtension(AppDomain.CurrentDomain.FriendlyName))
{
}
#endregion
/// <summary>
/// Creates the session. Only one file should be for session log, so removed old file and create a new file.
/// </summary>
public void CreateSession()
{
RemoveOldLogFile();
LogFile = CreateLogFileName();
_inInSession = true;
}
/// <summary>
/// Ends the session. Set flag _inInSession to false.
/// </summary>
public void EndSession()
{
_inInSession = false;
}
/// <summary>
/// Creates the name of the log file.
/// </summary>
/// <returns></returns>
private String CreateLogFileName()
{
return Path.Combine(Folder, string.Format("{1}-{0:dd-MM-yyyy_HH-mm-ss}{2}.log", DateTime.Now, Tag, FILE_SESSION_EXTENSION));
}
/// <summary>
/// Delete the old log file if is existed.
/// </summary>
private void RemoveOldLogFile()
{
try
{
if (Directory.Exists(Folder))
{
string[] fileEntries = Directory.GetFiles(Folder, "*.log");
foreach (string fileName in fileEntries)
{
try
{
File.Delete(fileName);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
}
/// <summary>
/// Called when write to session log file.
/// </summary>
/// <param name="output">The output.</param>
public void OnLog(LogItemBase output)
{
if (_inInSession)
{
try
{
if(++_writeCount > FILE_SIZE_CHECK_COUNT && new FileInfo(LogFile).Length > MaxFileSizeLimit)
{
_writeCount = 0;
CreateSession();
File.AppendAllText(LogFile, "### This log file is a continuation of a previous log file ###" + Environment.NewLine + Environment.NewLine);
}
File.AppendAllText(LogFile, output.ToString() + Environment.NewLine);
}
catch
{
Debug.WriteLine("Error Writing To Session Log File!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
}
}
}
}
}
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