using log4net.Appender;
using log4net.Core;
using log4net.Repository.Hierarchy;
using log4net;
using System;
using System.Collections.Generic;

namespace TBF.Tools
{
    public class LogChecker : IDisposable
    {
        readonly Logger _logger;
        readonly Level _previousLevel;
        readonly MemoryAppender _appender = new MemoryAppender();

        public LogChecker(string logName, Level levelToCheck)
        {
            _logger = (Logger)LogManager.GetLogger(logName).Logger;
            _logger.AddAppender(_appender);
            _previousLevel = _logger.Level;
            _logger.Level = levelToCheck;
        }

        public List<string> Messages
        {
            get
            {
                return new List<log4net.Core.LoggingEvent>(_appender.GetEvents())
                      .ConvertAll(x => x.RenderedMessage);
            }
        }

        public void Dispose()
        {
            _logger.Level = _previousLevel;
            _logger.RemoveAppender(_appender);
        }
    }
}

// Example of use
// 
// using (Tools.LogChecker logChecker = new Tools.LogChecker("RfidData", log4net.Core.Level.Debug))
// {
//    Execute query using NHibernate
//    ....
//
//    MessageBox.Show(String.Join(Environment.NewLine,logChecker.Messages));
// }
//