using DominionBase.Enums;
using DominionBase.Players;
using System.Diagnostics.Contracts;

namespace DominionBase.Cards.Menagerie
{
	public class SnowyVillage : Card
	{
		private IPlayer _turnEndedPlayer;
		private TurnEndedEventHandler _turnEndedEventHandler;
		private BenefitReceivingEventHandler _benefitReceivingEventHandler;

		public SnowyVillage()
			: base(Categories.Action, Source.Menagerie, Location.Kingdom, Traits.PlusAction | Traits.PlusBuy | Traits.PlusCard | Traits.PlusMultipleActions)
		{
			BaseCost = new Cost(3);
			Benefit.Cards = 1;
			Benefit.Actions = 4;
			Benefit.Buys = 1;
		}

		public override void TearDown(IGame game)
		{
			base.TearDown(game);

			if (_turnEndedEventHandler != null && _turnEndedPlayer != null)
				Player_TurnEnded(_turnEndedPlayer, new TurnEndedEventArgs(_turnEndedPlayer));
			_turnEndedEventHandler = null;
		}

		public override void FollowInstructions(IPlayer player)
		{
			Contract.Requires(player != null, "player cannot be null");
			base.FollowInstructions(player);


			if (_turnEndedEventHandler == null)
			{
				_turnEndedPlayer = player;
				_turnEndedEventHandler = new TurnEndedEventHandler(Player_TurnEnded);
				player.TurnEnded += _turnEndedEventHandler;
			}

			if (_benefitReceivingEventHandler == null)
			{
				_benefitReceivingEventHandler = new BenefitReceivingEventHandler(Player_SnowyVillagePlayed);
				player.BenefitReceiving += _benefitReceivingEventHandler;
			}
		}

		private void Player_SnowyVillagePlayed(object sender, BenefitReceiveEventArgs e)
		{
			if (e.Benefit.Actions > 0)
			{
				e.Player._Game.SendMessage(e.Player, this, "ActionGainChanged", 0);
				e.Benefit.Actions = 0;
			}
		}

		private void Player_TurnEnded(object sender, TurnEndedEventArgs e)
		{
			var player = sender as IPlayer;

			if (_turnEndedEventHandler != null && _turnEndedPlayer != null)
				_turnEndedPlayer.TurnEnded -= _turnEndedEventHandler;
			_turnEndedPlayer = null;
			_turnEndedEventHandler = null;

			if (_benefitReceivingEventHandler != null)
				player.BenefitReceiving -= _benefitReceivingEventHandler;
			_benefitReceivingEventHandler = null;
		}
	}
}