#region Copyright & License Information
/*
 * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
 * This file is part of OpenRA.
 * 
 *  OpenRA 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 3 of the License, or
 *  (at your option) any later version.
 * 
 *  OpenRA 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 OpenRA.  If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System.Collections.Generic;
using System.Linq;

namespace OpenRA.Orders
{
	public class GenericSelectTarget : IOrderGenerator
	{
		readonly Actor subject;
		readonly string order;
		readonly string cursor;

		public GenericSelectTarget(Actor subject, string order, string cursor)
		{
			this.subject = subject;
			this.order = order;
			this.cursor = cursor;
		}

		public IEnumerable<Order> Order(World world, int2 xy, MouseInput mi)
		{
			if (mi.Button == MouseButton.Right)
				Game.controller.CancelInputMode();
			return OrderInner(world, xy, mi);
		}

		IEnumerable<Order> OrderInner(World world, int2 xy, MouseInput mi)
		{
			if (mi.Button == MouseButton.Left)
				yield return new Order(order, subject, xy);
		}

		public virtual void Tick(World world) { }
		public void Render(World world) { }

		public string GetCursor(World world, int2 xy, MouseInput mi) { return cursor; }
	}

	// variant that requires a tag trait (T) to be present on some actor owned
	// by the activating player
	public class GenericSelectTargetWithBuilding<T> : GenericSelectTarget
	{
		public GenericSelectTargetWithBuilding(Actor subject, string order, string cursor)
			: base(subject, order, cursor) { }

		public override void Tick(World world)
		{
			var hasStructure = world.Queries.OwnedBy[world.LocalPlayer]
					.WithTrait<T>()
					.Any();

			if (!hasStructure)
				Game.controller.CancelInputMode();
		}
	}

}
