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

namespace DominionBase.Cards.Menagerie
{
	public class Sheepdog : Card
	{
		private CardGainedEventHandler _CardGainedHandler;

		public Sheepdog()
			: base(Categories.Action | Categories.Reaction, Source.Menagerie, Location.Kingdom, Traits.NetCardDraw | Traits.PlusCard | Traits.ReactToGain | Traits.Terminal)
		{
			BaseCost = new Cost(3);
			Benefit.Cards = 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.CardGained -= Player_CardGained;
		}

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

			if (location == DeckLocation.Hand)
			{
				if (_CardGainedHandler != null)
					player.CardGained -= _CardGainedHandler;

				_CardGainedHandler = new CardGainedEventHandler(Player_CardGained);
				player.CardGained += _CardGainedHandler;
			}
		}

		private void Player_CardGained(object sender, CardGainEventArgs e)
		{
			var player = sender as IPlayer;

			var key = Type.ToString();

			// Already been cancelled -- don't need to process this one
			// We also need to make sure we're in the player's hand and we can be revealed
			if (e.Cancelled || player != Owner || !player.Hand.Contains(PhysicalCard) || e.Resolvers.ContainsKey(key))
				return;

			e.Resolvers[key] = new CardGainResolver(player, this, "PlayCard", Resource.PlayCard.Replace("{card}", PhysicalCard.ToString()), Player_Action, false);
		}

		internal void Player_Action(IPlayer player, ref CardGainEventArgs e)
		{
			if (player.Hand.Contains(PhysicalCard))
			{
				player.Actions++;
				player.PlayCard(PhysicalCard, DeckLocation.InPlay);
				e.HandledBy.Add(this);
			}
		}

		public override void RemovedFrom(DeckLocation location, IPlayer player)
		{
			Contract.Requires(player != null, "player cannot be null");
			base.RemovedFrom(location, player);
			if (_CardGainedHandler != null)
				player.CardGained -= _CardGainedHandler;
			_CardGainedHandler = null;
		}
	}
}