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

namespace DominionBase.Cards.Nocturne
{
	public class LostInTheWoods : State
	{
		private IPlayer _turnStartedPlayer;

		public LostInTheWoods()
			: base(Source.Nocturne, Traits.ConditionalBenefit | Traits.Discard)
		{
		}

		public override bool CanBeMultiples => false;

		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)
		{
			var choice = new Choice("You may discard a card to receive a Boon.", this, player.Hand, ChoiceOutcome.Discard, player, minimum: 0);
			var result = player.MakeChoice(choice);
			if (result.Cards.Any())
			{
				player.Discard(DeckLocation.Hand, result.Cards);
				var supply = (IBoonSupply)player._Game.Table.SpecialPiles[TypeClass.Boons];
				supply.TurnOverNextAndReceive(player);
			}

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