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

namespace DominionBase.Cards.Renaissance
{
	public class FlagBearer : Card
	{
		public FlagBearer()
			: base(Categories.Action, Source.Renaissance, Location.Kingdom, Traits.PlusCoin | Traits.ReactToGain | Traits.ReactToTrashing | Traits.Terminal)
		{
			BaseCost = new Cost(4);
			Benefit.Currency.Coin.Value = 2;
		}

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

			foreach (var player in game.Players)
			{
				player.CardGained += Player_CardGained;
				player.Trashed += Player_Trashed;
			}
		}

		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;
				player.Trashed -= Player_Trashed;
			}
		}

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

			// This is not the card you are looking for
			if (e.Card != this || e.Resolvers.ContainsKey(key) || e.HandledBy.Contains(this))
				return;

			e.Resolvers[key] = new CardGainResolver(player, this, "TakeFlag", "Take the Flag", Player_GainFlagBearer, true);
		}

		private void Player_Trashed(object sender, TrashEventArgs e)
		{
			// Already being processed or been handled -- don't need to process this one
			if (e.Resolvers.ContainsKey(Type) || e.HandledBy.Contains(this))
				return;

			if (e.TrashedCards.Contains(PhysicalCard))
				e.Resolvers[Type] = new TrashResolver(e.CurrentPlayer, this, "Take the Flag", Player_TrashFlagBearer, true);
		}

		internal void Player_GainFlagBearer(IPlayer player, ref CardGainEventArgs e)
		{
			GainOrTrashBenefit(player);

			e.HandledBy.Add(this);
		}

		internal void Player_TrashFlagBearer(IPlayer player, ref TrashEventArgs e)
		{
			GainOrTrashBenefit(player);

			e.HandledBy.Add(this);
		}

		private void GainOrTrashBenefit(IPlayer player)
		{
			player.Take(TypeClass.Flag);
		}
	}
}