using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OpenRa.Game.Traits.Activities;

namespace OpenRa.Game.Traits
{
	class Plane : IOrder, IMovement
	{
		public IDisposable reservation;

		public Plane(Actor self) {}

		public Order IssueOrder(Actor self, int2 xy, MouseInput mi, Actor underCursor)
		{
			if (mi.Button == MouseButton.Left) return null;
			if (underCursor == null)
				return new Order("Move", self, null, xy, null);

			if (underCursor.Info == Rules.UnitInfo["AFLD"]
				&& underCursor.Owner == self.Owner)
			{
				var res = underCursor.traits.GetOrDefault<Reservable>();
				if (res != null && res.IsReserved)
					return null;

				return new Order("Enter", self, underCursor, int2.Zero, null);
			}

			return null;
		}

		public void ResolveOrder(Actor self, Order order)
		{
			if (reservation != null)
			{
				reservation.Dispose();
				reservation = null;
			}

			if (order.OrderString == "Move")
			{
				self.CancelActivity();
				self.QueueActivity(new Fly(Util.CenterOfCell(order.TargetLocation)));
				self.QueueActivity(new ReturnToBase(self, null));
				self.QueueActivity(new Rearm());
			}

			if (order.OrderString == "Enter")
			{
				var res = order.TargetActor.traits.GetOrDefault<Reservable>();
				if (res != null)
				{
					if (res.IsReserved) return;
					reservation = res.Reserve(self);
				}

				self.CancelActivity();
				self.QueueActivity(new ReturnToBase(self, order.TargetActor));
				self.QueueActivity(new Rearm());		/* todo: something else when it's FIX rather than AFLD */
			}
		}

		public UnitMovementType GetMovementType()
		{
			return UnitMovementType.Fly;
		}

		public bool CanEnterCell(int2 location)
		{
			return true; // Planes can go anywhere (?)
		}
	}
}