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

namespace DominionBase.Cards.Renaissance
{
	public class Lantern : Artifact
	{
		private IPlayer _BorderGuardPlayer;

		public Lantern()
			: base(Source.Renaissance, Traits.Discard)
		{
		}

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

			if (_BorderGuardPlayer != null)
			{
				_BorderGuardPlayer.CardPlaying -= Player_CardPlaying;
				foreach (var bg in _BorderGuardPlayer.EndgamePile.OfType<BorderGuard>())
					bg.BorderGuardRevealing -= Card_BorderGuardRevealing;
			}
			_BorderGuardPlayer = null;
		}

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

			if (_BorderGuardPlayer != null)
				_BorderGuardPlayer.CardPlaying -= Player_CardPlaying;
			_BorderGuardPlayer = player;
			_BorderGuardPlayer.CardPlaying += Player_CardPlaying;
		}

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

			player.CardPlaying -= Player_CardPlaying;
			_BorderGuardPlayer = null;
		}

		private void Player_CardPlaying(object sender, CardPlayingEventArgs e)
		{
			foreach (var card in e.Cards.OfType<BorderGuard>())
				card.BorderGuardRevealing += Card_BorderGuardRevealing;
		}

		private void Card_BorderGuardRevealing(object sender, BorderGuardRevealEventArgs e)
		{
			(sender as BorderGuard).BorderGuardRevealing -= Card_BorderGuardRevealing;

			e.CardsToReveal = 3;
		}
	}
}