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

namespace DominionBase.Cards.Nocturne
{
	public class Exorcist : Card
	{
		public Exorcist()
			: base(Categories.Night, Source.Nocturne, Location.Kingdom, Traits.ConditionalBenefit | Traits.Gainer | Traits.IncludesExtraPiles | Traits.RemoveCurses | Traits.RemoveFromHand | Traits.Trasher | Traits.TrashForBenefit)
		{
			BaseCost = new Cost(4);
		}

		public override void SetupSupply(IGame game, ISupply supply)
		{
			Contract.Requires(game != null, "game cannot be null");
			base.SetupSupply(game, supply);

			WillOWisp.SetupSupply(game);
			Imp.SetupSupply(game);
			Ghost.SetupSupply(game);
		}

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

			var choiceTrash = new Choice(Resource.ChooseACardToTrash, this, player.Hand, ChoiceOutcome.Trash, player);
			var resultTrash = player.MakeChoice(choiceTrash);
			player.Trash(this, player.RetrieveCardsFrom(DeckLocation.Hand, resultTrash.Cards));

			if (resultTrash.Cards.Any())
			{
				var trashedCardCost = player._Game.ComputeCost(resultTrash.Cards[0]);

				var gainableSupplies = new CardCollection(
					player._Game.Table.SpecialPiles.Values.OfType<ISupply>()
						.Where(supply => supply.CanGain() && supply.Category.HasFlag(Categories.Spirit) && trashedCardCost > supply.CurrentCost)
						.Select(supply => (Card)supply.TopCard)
					);
				var choice = new Choice("Gain a Spirit", this, gainableSupplies, ChoiceOutcome.Gain, player, false);
				var result = player.MakeChoice(choice);
				if (result.Cards.Any())
					player.Gain((ISupply)player._Game.Table.SpecialPiles[result.Cards[0]], this);
			}
		}
	}
}