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

namespace DominionBase.Cards.Renaissance
{
	public class TreasureChest : Artifact
	{
		private IPlayer _buyPhaseStartedPlayer;

		public TreasureChest()
			: base(Source.Renaissance, Traits.Gainer)
		{
		}

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

			if (_buyPhaseStartedPlayer != null)
				_buyPhaseStartedPlayer.PhaseChanging -= Player_PhaseChanging;
			_buyPhaseStartedPlayer = null;
		}

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

			if (_buyPhaseStartedPlayer != null)
				_buyPhaseStartedPlayer.PhaseChanging -= Player_PhaseChanging;
			_buyPhaseStartedPlayer = player;
			_buyPhaseStartedPlayer.PhaseChanging += Player_PhaseChanging;
		}

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

			player.PhaseChanging -= Player_PhaseChanging;
			_buyPhaseStartedPlayer = null;
		}

		private void Player_PhaseChanging(object sender, PhaseChangingEventArgs e)
		{
			if (!e.HandledBy.Contains(TypeClass.TreasureChest) && e.NewPhase == PhaseEnum.BuyTreasure)
				e.Resolvers[TypeClass.TreasureChest] = new PhaseChangingResolver(this, "Gain a Gold", Player_Action, true);
		}

		internal void Player_Action(IPlayer player, ref PhaseChangingEventArgs e)
		{
			player.Gain(player._Game.Table.Gold, this);

			e.HandledBy.Add(TypeClass.TreasureChest);
		}
	}
}