using Shogi.Domain.Pathing;
using System.Collections.ObjectModel;

namespace Shogi.Domain.Pieces
{
	internal class SilverGeneral : Piece
	{
		public static readonly ReadOnlyCollection<Path> Player1Paths = new(new List<Path>(4)
		{
			new Path(Direction.Up),
			new Path(Direction.UpLeft),
			new Path(Direction.UpRight),
			new Path(Direction.DownLeft),
			new Path(Direction.DownRight)
		});

		public static readonly ReadOnlyCollection<Path> Player2Paths =
			Player1Paths
			.Select(p => p.Invert())
			.ToList()
			.AsReadOnly();

		public SilverGeneral(WhichPlayer owner, bool isPromoted = false)
			: base(WhichPiece.SilverGeneral, owner, isPromoted)
		{
		}

		public override ReadOnlyCollection<Path> MoveSet => Owner switch
		{
			WhichPlayer.Player1 => IsPromoted ? GoldGeneral.Player1Paths : Player1Paths,
			WhichPlayer.Player2 => IsPromoted ? GoldGeneral.Player2Paths : Player2Paths,
			_ => throw new NotImplementedException(),
		};
	}
}