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

namespace DominionBase.Cards.Renaissance
{
	public class Priest : Card
	{
		private int trashTriggerCount = 0;
		private IPlayer trashingPlayer = null;

		public Priest()
			: base(Categories.Action, Source.Renaissance, Location.Kingdom, Traits.DeckReduction | Traits.PlusCoin | Traits.ReactToTrashing | Traits.RemoveCurses | Traits.RemoveFromHand | Traits.Terminal | Traits.Trasher)
		{
			BaseCost = new Cost(4);
			Benefit.Currency.Coin.Value = 2;
		}

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

			foreach (var player in game.Players)
			{
				player.Trashed -= Player_Trashed;
				player.TurnEnded -= Player_TurnEnded;
			}
		}

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

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

			if (trashTriggerCount++ == 0)
			{
				trashingPlayer = player;
				player.Trashed += Player_Trashed;
				player._Game.CurrentTurn.Player.TurnEnded += Player_TurnEnded;
			}
		}

		private void Player_TurnEnded(object sender, TurnEndedEventArgs e)
		{
			e.Player.TurnEnded -= Player_TurnEnded;
			trashingPlayer.Trashed -= Player_Trashed;
			trashingPlayer = null;
			trashTriggerCount = 0;
		}

		private void Player_Trashed(object sender, TrashEventArgs e)
		{
			var player = sender as IPlayer;
			if (e.HandledBy.Contains(this))
				return;
			
			e.Resolvers[TypeClass.Priest] = new TrashResolver(player, this, $"Gain <coin>{2 * trashTriggerCount}</coin>", Player_Trashed, true);
		}

		internal void Player_Trashed(IPlayer player, ref TrashEventArgs e)
		{
			player.ReceiveBenefit(this, new CardBenefit { 
				Currency = new Currency(2 * trashTriggerCount * e.TrashedCards.Count(c => c.Category.HasFlag(Categories.Card)))
			});

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