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

namespace DominionBase.Cards.Renaissance
{
	public class Flag : Artifact
	{
		private IPlayer _drawNewHandPlayer;

		public Flag()
			: base(Source.Renaissance, Traits.PlusCard)
		{
		}

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

			if (_drawNewHandPlayer != null)
				_drawNewHandPlayer.DrawNewHand -= Player_DrawNewHand;
			_drawNewHandPlayer = null;
		}

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

			if (_drawNewHandPlayer != null)
				_drawNewHandPlayer.DrawNewHand -= Player_DrawNewHand;
			_drawNewHandPlayer = player;
			_drawNewHandPlayer.DrawNewHand += Player_DrawNewHand;
		}

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

			player.DrawNewHand -= Player_DrawNewHand;
			_drawNewHandPlayer = null;
		}

		private void Player_DrawNewHand(object sender, DrawNewHandEventArgs e)
		{
			if (e.Resolvers.ContainsKey(Type) || e.HandledBy.Contains(this))
				return;

			e.Resolvers[Type] = new DrawNewHandResolver(this, $"Resolve {this}", Player_Action, true);
		}

		internal void Player_Action(IPlayer player, ref DrawNewHandEventArgs e)
		{
			e.DrawSize += 1;
			player._Game.SendMessage(player, this, e.DrawSize);

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