/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2021 Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using System.IO;
using System.Reflection;
using System.Windows.Forms;
using log4net;
using log4net.Appender;
using log4net.Config;
using log4net.Repository.Hierarchy;
using System;
using GreenshotPlugin.IniFile;
using log4net.Util;

namespace GreenshotPlugin.Core {
	/// <summary>
	/// Initialize the logger
	/// </summary>
	public class LogHelper {
		private static bool _isLog4NetConfigured;
		private const string InitMessage = "Greenshot initialization of log system failed";

		public static bool IsInitialized => _isLog4NetConfigured;

		// Initialize Log4J
		public static string InitializeLog4Net() {
			// Setup log4j, currently the file is called log4net.xml
			foreach (var logName in new[] { "log4net.xml" , @"App\Greenshot\log4net-portable.xml"})
			{
				string log4NetFilename = Path.Combine(Application.StartupPath, logName);
				if (File.Exists(log4NetFilename))
				{
					try
					{
						XmlConfigurator.Configure(new FileInfo(log4NetFilename));
						_isLog4NetConfigured = true;
					}
					catch (Exception ex)
					{
						MessageBox.Show(ex.Message, InitMessage, MessageBoxButtons.OK, MessageBoxIcon.Warning);
					}
				}
			}
			// Fallback
			if (!_isLog4NetConfigured) {
				try {
					Assembly assembly = typeof(LogHelper).Assembly;
                    using Stream stream = assembly.GetManifestResourceStream("GreenshotPlugin.log4net-embedded.xml");
                    XmlConfigurator.Configure(stream);
                    _isLog4NetConfigured = true;
                    IniConfig.ForceIniInStartupPath();
                } catch (Exception ex){
					MessageBox.Show(ex.Message, InitMessage, MessageBoxButtons.OK, MessageBoxIcon.Warning);
				}
			}

			if (_isLog4NetConfigured) {
				// Get the logfile name
				try {
					if (((Hierarchy)LogManager.GetRepository()).Root.Appenders.Count > 0) {
						foreach (IAppender appender in ((Hierarchy)LogManager.GetRepository()).Root.Appenders)
						{
							var fileAppender = appender as FileAppender;
							if (fileAppender != null) {
								return fileAppender.File;
							}
						}
					}
				}
				catch
				{
					// ignored
				}
			}
			return null;
		}
	}

	/// <summary>
	/// A simple helper class to support the logging to the AppData location
	/// </summary>
	public class SpecialFolderPatternConverter : PatternConverter {
		protected override void Convert(TextWriter writer, object state) {
			Environment.SpecialFolder specialFolder = (Environment.SpecialFolder)Enum.Parse(typeof(Environment.SpecialFolder), Option, true);
			writer.Write(Environment.GetFolderPath(specialFolder));
		}
	}
}