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

namespace DominionBase.Cards.Menagerie
{
	public class SeizeTheDay : Event
	{
		private TurnEndedEventHandler _turnEndedEventHandler;

		public SeizeTheDay()
			: base(Source.Menagerie, 4, Traits.None)
		{
		}

		public override void TearDown(IGame game)
		{
			Contract.Requires(game != null, "game cannot be null");

			if (_turnEndedEventHandler != null)
				foreach (var player in game.Players)
					player.TurnEnded -= _turnEndedEventHandler;
			_turnEndedEventHandler = null;

			base.TearDown(game);
		}

		public override bool CanBuy(IPlayer player, Currency currency)
		{
			Contract.Requires(player != null, "player cannot be null");
			if (player._Game.TurnsTaken.Any(t => t.Player == player && t.CardsBought.Contains(this)))
				return false;

			return base.CanBuy(player, currency);
		}

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

			if (player._Game.TurnsTaken.Count(t => t.Player == player && t.CardsBought.Contains(this)) == 1)
			{
				if (_turnEndedEventHandler != null)
					player.TurnEnded -= _turnEndedEventHandler;

				_turnEndedEventHandler = new TurnEndedEventHandler(Player_TurnEnded);
				player.TurnEnded += _turnEndedEventHandler;
			}
		}

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

			e.NextPlayer = e.Player;
			e.NextGrantedBy = this;

			if (_turnEndedEventHandler != null)
				player.TurnEnded -= _turnEndedEventHandler;
			_turnEndedEventHandler = null;
		}
	}
}