#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 System.Linq;
using OpenRA.Mods.RA.Activities;
using OpenRA.Mods.RA.Buildings;
using OpenRA.Mods.RA.Move;
using OpenRA.Mods.RA.Orders;
using OpenRA.Traits;

namespace OpenRA.Mods.RA
{
	class RepairableNearInfo : ITraitInfo, Requires<HealthInfo>
	{
		[ActorReference] public readonly string[] Buildings = { "spen", "syrd" };
		public readonly int CloseEnough = 4;	/* cells */

		public object Create( ActorInitializer init ) { return new RepairableNear( init.self, this ); }
	}

	class RepairableNear : IIssueOrder, IResolveOrder
	{
		readonly Actor self;
		readonly RepairableNearInfo info;

		public RepairableNear( Actor self, RepairableNearInfo info ) { this.self = self; this.info = info; }

		public IEnumerable<IOrderTargeter> Orders
		{
			get
			{
				yield return new EnterAlliedActorTargeter<Building>("RepairNear", 5,
					target => CanRepairAt(target), _ => ShouldRepair());
			}
		}

		public Order IssueOrder( Actor self, IOrderTargeter order, Target target, bool queued )
		{
			if( order.OrderID == "RepairNear" )
				return new Order(order.OrderID, self, queued) { TargetActor = target.Actor };

			return null;
		}

		bool CanRepairAt( Actor target )
		{
			return info.Buildings.Contains( target.Info.Name );
		}

		bool ShouldRepair()
		{
			return self.GetDamageState() > DamageState.Undamaged;
		}

		public void ResolveOrder(Actor self, Order order)
		{
			if (order.OrderString == "RepairNear" && CanRepairAt(order.TargetActor) && ShouldRepair())
			{
				var movement = self.Trait<IMove>();
				var target = Target.FromOrder(order);

				self.CancelActivity();
				self.QueueActivity(movement.MoveWithinRange(target, new WRange(1024*info.CloseEnough)));
				self.QueueActivity(new Repair(order.TargetActor));

				self.SetTargetLine(target, Color.Green, false);
			}
		}
	}
}