#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.Diagnostics;
using System.IO;
using OpenRA.FileFormats;

namespace OpenRA
{
	public enum PlatformType { Unknown, Windows, OSX, Linux }

	public static class Platform
	{
		public static PlatformType CurrentPlatform { get { return currentPlatform.Value; } }

		static Lazy<PlatformType> currentPlatform = Lazy.New((Func<PlatformType>)GetCurrentPlatform);

		static PlatformType GetCurrentPlatform()
		{
				if (Environment.OSVersion.Platform == PlatformID.Win32NT)
					return PlatformType.Windows;

				try
				{
					var psi = new ProcessStartInfo("uname", "-s");
					psi.UseShellExecute = false;
					psi.RedirectStandardOutput = true;
					var p = Process.Start(psi);
					var kernelName = p.StandardOutput.ReadToEnd();
					if (kernelName.Contains("Linux") || kernelName.Contains("BSD"))
						return PlatformType.Linux;
					if (kernelName.Contains("Darwin"))
						return PlatformType.OSX;
				}
				catch {	}

				return PlatformType.Unknown;
		}

		public static string SupportDir
		{
			get
			{
				// Use a local directory in the game root if it exists
				if (Directory.Exists("Support"))
					return "Support" + Path.DirectorySeparatorChar;

				var dir = Environment.GetFolderPath(Environment.SpecialFolder.Personal);

				switch (CurrentPlatform)
				{
				case PlatformType.Windows:
					dir += Path.DirectorySeparatorChar + "OpenRA";
					break;
				case PlatformType.OSX:
					dir += "/Library/Application Support/OpenRA";
					break;
				case PlatformType.Linux:
				default:
					dir += "/.openra";
					break;
				}

				if (!Directory.Exists(dir))
					Directory.CreateDirectory(dir);

				return dir + Path.DirectorySeparatorChar;
			}
		}
	}
}