#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.Collections.Generic;
using System.Drawing;
using OpenRA.Traits;
using OpenRA.Mods.RA.Move;

namespace OpenRA.Mods.RA.Activities
{
	public class DeliverResources : Activity
	{
		bool isDocking;

		public DeliverResources() { }

		public override Activity Tick( Actor self )
		{
			if( NextActivity != null )
				return NextActivity;

			var mobile = self.Trait<Mobile>();
			var harv = self.Trait<Harvester>();

			if (harv.LinkedProc == null || !harv.LinkedProc.IsInWorld)
				harv.ChooseNewProc(self, null);

			if (harv.LinkedProc == null)	// no procs exist; check again in 1s.
				return Util.SequenceActivities( new Wait(25), this );

			var proc = harv.LinkedProc;
			var iao = proc.Trait<IAcceptOre>();

			self.SetTargetLine(Target.FromActor(proc), Color.Green, false);
			if( self.Location != proc.Location + iao.DeliverOffset )
				return Util.SequenceActivities( mobile.MoveTo(proc.Location + iao.DeliverOffset, 0), this );

			if (!isDocking)
			{
				isDocking = true;
				iao.OnDock(self, this);
			}

			return Util.SequenceActivities( new Wait(10), this );
		}

		// Cannot be cancelled
		public override void Cancel(Actor self) { }
	}
}