#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;

namespace OpenRA.Utility
{
	class Program
	{
		[STAThread]
		static void Main(string[] args)
		{
			var actions = new Dictionary<string, Action<string[]>>()
			{
				{ "--display-filepicker", Command.DisplayFilepicker },
				{ "--settings-value", Command.Settings },
				{ "--shp", Command.ConvertPngToShp },
				{ "--png", Command.ConvertShpToPng },
			};

			if (args.Length == 0) { PrintUsage(); return; }

            var supportDir = GetNamedArg(args, "--SupportDir");
            if (supportDir != null)
                Log.LogPath = Path.Combine(supportDir.Replace("\"", ""), "Logs");

			try
			{
				var action = WithDefault( null, () => actions[args[0]]);
				if (action == null)
					PrintUsage();
				else
					action(args);
			}
			catch( Exception e )
			{
				Log.AddChannel("utility", "utility.log");
				Log.Write("utility", "Received args: {0}", string.Join(" ", args));
				Log.Write("utility", "{0}", e.ToString());
				
				Console.WriteLine("Error: Utility application crashed. See utility.log for details");
				throw;
			}
		}

		static void PrintUsage()
		{
			Console.WriteLine("Usage: OpenRA.Utility.exe [OPTION] [ARGS]");
			Console.WriteLine();
			Console.WriteLine("  --settings-value SUPPORTDIR KEY  Get value of KEY in SUPPORTDIR/settings.yaml");
			Console.WriteLine("  --shp PNGFILE FRAMEWIDTH         Convert a PNG containing one or more frames to a SHP");
			Console.WriteLine("  --png SHPFILE PALETTE            Convert a SHP to a PNG containing all of its frames");
		}

		static T WithDefault<T>(T def, Func<T> f)
		{
			try { return f(); }
			catch { return def; }
		}

        static string GetNamedArg(string[] args, string arg)
        {
            if (args.Length < 2)
                return null;

            var i = Array.IndexOf(args, arg);
            if (i < 0 || i == args.Length - 1)  // doesnt exist, or doesnt have a value.
                return null;

            return args[i + 1];
        }
	}
}