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

namespace DominionBase.Cards.Renaissance
{
	public class Key : Artifact
	{
		private IPlayer _turnStartedPlayer;

		public Key()
			: base(Source.Renaissance, Traits.PlusCoin)
		{
		}

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

			if (_turnStartedPlayer != null)
				_turnStartedPlayer.TurnStarted -= Player_TurnStarted;
			_turnStartedPlayer = null;
		}

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

			if (_turnStartedPlayer != null)
				_turnStartedPlayer.TurnStarted -= Player_TurnStarted;
			_turnStartedPlayer = player;
			_turnStartedPlayer.TurnStarted += Player_TurnStarted;
		}

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

			player.TurnStarted -= Player_TurnStarted;
			_turnStartedPlayer = null;
		}

		private void Player_TurnStarted(object sender, TurnStartedEventArgs e)
		{
			var key = ToString();
			if (e.HandledBy.Contains(key))
				return;

			if (!e.Resolvers.ContainsKey(key))
				e.Resolvers[key] = new TurnStartedResolver(e.Player, this, $"Resolve {this}", Player_Action, true);
		}

		internal void Player_Action(IPlayer player, ref TurnStartedEventArgs e)
		{
			player.ReceiveBenefit(this, new CardBenefit { Currency = new Currency(1) });

			e.HandledBy.Add(ToString());
		}
	}
}