// Copyright (c) 2011, Outercurve Foundation.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// - Redistributions of source code must  retain  the  above copyright notice, this
//   list of conditions and the following disclaimer.
//
// - Redistributions in binary form  must  reproduce the  above  copyright  notice,
//   this list of conditions  and  the  following  disclaimer in  the documentation
//   and/or other materials provided with the distribution.
//
// - Neither  the  name  of  the  Outercurve Foundation  nor   the   names  of  its
//   contributors may be used to endorse or  promote  products  derived  from  this
//   software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,  BUT  NOT  LIMITED TO, THE IMPLIED
// WARRANTIES  OF  MERCHANTABILITY   AND  FITNESS  FOR  A  PARTICULAR  PURPOSE  ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL,  SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO,  PROCUREMENT  OF  SUBSTITUTE  GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER  CAUSED AND ON
// ANY  THEORY  OF  LIABILITY,  WHETHER  IN  CONTRACT,  STRICT  LIABILITY,  OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING  IN  ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;
using System.Diagnostics;

namespace WebsitePanel.Server.Utils
{
	/// <summary>
	/// Application log.
	/// </summary>
	public sealed class Log
	{
        private static TraceSwitch logSeverity = new TraceSwitch("Log", "General trace switch");
		
		private Log()
		{
		}

		/// <summary>
		/// Write error to the log.
		/// </summary>
		/// <param name="message">Error message.</param>
		/// <param name="ex">Exception.</param>
		public static void WriteError(string message, Exception ex)
		{
			try
			{
				if (logSeverity.TraceError)
				{
					string line = string.Format("[{0:G}] ERROR: {1}\n{2}\n", DateTime.Now, message, ex);
					Trace.TraceError(line);
				}
			}
			catch { }
		}

		/// <summary>
		/// Write error to the log.
		/// </summary>
		/// <param name="ex">Exception.</param>
		public static void WriteError(Exception ex)
		{

			try
			{
				if (ex != null)
				{
					WriteError(ex.Message, ex);
				}
			}
			catch { }
		}

		/// <summary>
		/// Write info message to log
		/// </summary>
		/// <param name="message"></param>
		public static void WriteInfo(string message, params object[] args)
		{
			try
			{
				if (logSeverity.TraceInfo)
				{
					Trace.TraceInformation(FormatIncomingMessage(message, args));
				}
			}
			catch { }
		}

		/// <summary>
		/// Write info message to log
		/// </summary>
		/// <param name="message"></param>
		public static void WriteWarning(string message, params object[] args)
		{
			try
			{
				if (logSeverity.TraceWarning)
				{
					Trace.TraceWarning(FormatIncomingMessage(message, args));
				}
			}
			catch { }
		}

		/// <summary>
		/// Write start message to log
		/// </summary>
		/// <param name="message"></param>
        public static void WriteStart(string message, params object[] args)
		{
			try
			{
				if (logSeverity.TraceInfo)
				{
					Trace.TraceInformation(FormatIncomingMessage(message, args));
				}
			}
			catch { }
		}
		
		/// <summary>
		/// Write end message to log
		/// </summary>
		/// <param name="message"></param>
        public static void WriteEnd(string message, params object[] args)
		{
			try
			{
				if (logSeverity.TraceInfo)
				{
					Trace.TraceInformation(FormatIncomingMessage(message, args));
				}
			}
			catch { }
		}

		private static string FormatIncomingMessage(string message, params object[] args)
		{
			//
			if (args.Length > 0)
			{
				message = String.Format(message, args);
			}
			//
			return String.Concat(String.Format("[{0:G}] END: ", DateTime.Now), message);
		}
	}
}