#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.Mods.RA.Activities;
using OpenRA.Effects;
using OpenRA.Traits;
using OpenRA.Traits.Activities;
using System.Drawing;
using System.Collections.Generic;
using OpenRA.Mods.RA.Orders;

namespace OpenRA.Mods.RA
{
	class RepairableInfo : ITraitInfo, ITraitPrerequisite<HealthInfo>
	{ 
		public readonly string[] RepairBuildings = { "fix" };
		public virtual object Create(ActorInitializer init) { return new Repairable(init.self); }
	}

	class Repairable : IIssueOrder, IResolveOrder, IOrderVoice
	{
		readonly Actor self;
		readonly Health Health;

		public Repairable(Actor self)
		{
			this.self = self;
			Health = self.Trait<Health>();
		}
		
		public IEnumerable<IOrderTargeter> Orders
		{
			get { yield return new EnterOrderTargeter<Building>( "Repair", 5, false, true, target => CanRepairAt( target ), _ => CanRepair() ); }
		}

		public Order IssueOrder( Actor self, IOrderTargeter order, Target target )
		{
			if( order.OrderID == "Repair" )
				return new Order( order.OrderID, self, target.Actor );

			return null;
		}

		bool CanRepairAt( Actor target )
		{
			return self.Info.Traits.Get<RepairableInfo>().RepairBuildings.Contains( target.Info.Name );
		}

		bool CanRepair()
		{
			var li = self.TraitOrDefault<LimitedAmmo>();
			return (Health.DamageState > DamageState.Undamaged || (li != null && !li.FullAmmo()) );
		}
		
		public string VoicePhraseForOrder(Actor self, Order order)
		{
			return (order.OrderString == "Repair" && CanRepair()) ? "Move" : null;
		}
		
		public void ResolveOrder(Actor self, Order order)
		{
			if (order.OrderString == "Repair")
			{
				if( !CanRepairAt( order.TargetActor ) || !CanRepair() )
					return;
				
				var rp = order.TargetActor.TraitOrDefault<RallyPoint>();

				if (self.Owner == self.World.LocalPlayer)
					self.World.AddFrameEndTask(w =>
					{
						w.Add(new FlashTarget(order.TargetActor));
						var line = self.TraitOrDefault<DrawLineToTarget>();
						if (line != null)
							line.SetTarget(self, Target.FromOrder(order), Color.Green);
					});
				
				self.CancelActivity();
				self.QueueActivity(new Move(Util.CellContaining(order.TargetActor.CenterLocation), order.TargetActor));
				self.QueueActivity(new Rearm());
				self.QueueActivity(new Repair(order.TargetActor));

				if (rp != null)
					self.QueueActivity(new CallFunc(
						() => self.QueueActivity(new Move(rp.rallyPoint, order.TargetActor))));
			}
		}
	}
}