#region Copyright & License Information
/*
 * Copyright 2007-2010 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 LICENSE.
 */
#endregion

using System.Linq;
using OpenRA.Traits;
using OpenRA.Widgets;

namespace OpenRA.Mods.RA.Widgets
{
	class ChooseBuildTabOnSelectInfo : ITraitInfo
	{
		public object Create( ActorInitializer init ) { return new ChooseBuildTabOnSelect( init ); }
	}

	class ChooseBuildTabOnSelect : INotifySelection
	{
		readonly World world;

		public ChooseBuildTabOnSelect( ActorInitializer init )
		{
			world = init.world;
		}

		public void SelectionChanged()
		{
			// Queue-per-structure
			var perqueue = world.Selection.Actors.FirstOrDefault(
				a => a.IsInWorld && a.World.LocalPlayer == a.Owner && a.HasTrait<ProductionQueue>());
			
			if (perqueue != null)
			{
				Widget.RootWidget.GetWidget<BuildPaletteWidget>("INGAME_BUILD_PALETTE")
					.SetCurrentTab(perqueue.TraitsImplementing<ProductionQueue>().First());
				return;
			}
			
			// Queue-per-player
			var types = world.Selection.Actors.Where(a => a.IsInWorld && (a.World.LocalPlayer == a.Owner))
											  .SelectMany(a => a.TraitsImplementing<Production>())
											  .SelectMany(t => t.Info.Produces)
											  .Distinct();

			if (types.Count() == 0)
				return;	

			Widget.RootWidget.GetWidget<BuildPaletteWidget>("INGAME_BUILD_PALETTE")
				.SetCurrentTab(world.LocalPlayer.PlayerActor.TraitsImplementing<ProductionQueue>().FirstOrDefault(t => types.Contains(t.Info.Type)));
		}
	}
}