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

namespace DominionBase.Cards.Renaissance
{
	public class Horn : Artifact
	{
		private IPlayer _discardPlayer;

		public Horn()
			: base(Source.Renaissance, Traits.CardOrdering)
		{
		}

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

			if (_discardPlayer != null)
				_discardPlayer.CardsDiscarding -= Player_CardsDiscarding;
			_discardPlayer = null;
		}

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

			if (_discardPlayer != null)
				_discardPlayer.CardsDiscarding -= Player_CardsDiscarding;
			_discardPlayer = player;
			_discardPlayer.CardsDiscarding += Player_CardsDiscarding;
		}

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

			player.CardsDiscarding -= Player_CardsDiscarding;
			_discardPlayer = null;
		}

		private void Player_CardsDiscarding(object sender, CardsDiscardEventArgs e)
		{
			if (e.HandledBy.Contains(this) || e.GetResolver(Type) != null ||
				(e.FromLocation != DeckLocation.InPlay && e.FromLocation != DeckLocation.SetAside && e.FromLocation != DeckLocation.InPlayAndSetAside))
				return;

			var foundBorderGuard = e.Cards.FirstOrDefault(c => c is BorderGuard);

			if (foundBorderGuard != null)
				e.AddResolver(Type, new CardsDiscardResolver(sender as IPlayer, this, Resource.PutCardOnYourDeck.Replace("{card}", foundBorderGuard.ToString()), Player_Action));
		}

		internal void Player_Action(IPlayer player, ref CardsDiscardEventArgs e)
		{
			var foundBorderGuard = e.Cards.FirstOrDefault(c => c is BorderGuard);

			e.Cards.Remove(foundBorderGuard);
			var thisCard = player.RetrieveCardFrom(player.InPlay.Contains(foundBorderGuard) ? DeckLocation.InPlay : DeckLocation.SetAside, foundBorderGuard);
			player.AddCardToDeck(thisCard, DeckPosition.Top);

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