#region Copyright & License Information
/*
 * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made 
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation. For more information,
 * see COPYING.
 */
#endregion

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Net;

namespace OpenRA
{
	public struct ChannelInfo
	{
		public string Filename;
		public StreamWriter Writer;
	}

	public static class Log
	{
		static string LogPathPrefix = Environment.GetFolderPath(Environment.SpecialFolder.Personal) + Path.DirectorySeparatorChar;
		static Dictionary<string, ChannelInfo> channels = new Dictionary<string,ChannelInfo>();

		public static string LogPath
		{
			get { return LogPathPrefix; }
			set
			{
				LogPathPrefix = value;				
				if (!Directory.Exists(LogPathPrefix))
					Directory.CreateDirectory(LogPathPrefix);
			}
		}
		
		public static void AddChannel(string channelName, string filename)
		{
			if (channels.ContainsKey(channelName)) return;
			
			var i = 0;
			var f = filename;
			while (File.Exists(LogPathPrefix + filename))
				try 
				{
					StreamWriter writer = File.CreateText(LogPathPrefix + filename);
					writer.AutoFlush = true;
					channels.Add(channelName, new ChannelInfo() { Filename = filename, Writer = writer });
					return;
				}
				catch (IOException) { filename = f + ".{0}".F(++i); }
			
			//if no logs exist, just make it
			StreamWriter w = File.CreateText(LogPathPrefix + filename);
			w.AutoFlush = true;
			channels.Add(channelName, new ChannelInfo() { Filename = filename, Writer = w });
			
		}

		public static void Write(string channel, string format, params object[] args)
		{
			ChannelInfo info;
			if (!channels.TryGetValue(channel, out info))
				throw new Exception("Tried logging to non-existant channel " + channel);

			info.Writer.WriteLine(format, args);
		}
	}
}