using PathFinding;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

namespace Gameboard.ShogiUI.BoardState.Pieces
{
  public class Knight : Piece
  {
    private static readonly List<Path> MoveSet = new List<Path>(2)
    {
      new Path(Direction.KnightLeft),
      new Path(Direction.KnightRight)
    };

    public Knight(WhichPlayer owner) : base(WhichPiece.Knight, owner)
    {
    }

    public override Piece DeepClone()
    {
      var clone = new Knight(Owner);
      if (IsPromoted) clone.Promote();
      return clone;
    }

    public override ICollection<Path> GetPaths()
    {
      var moveSet = IsPromoted ? GoldenGeneral.MoveSet : MoveSet;
      return Owner == WhichPlayer.Player1 ? moveSet : moveSet.Select(_ => new Path(Vector2.Negate(_.Direction), _.Distance)).ToList();
    }
  }
}