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

namespace Gameboard.ShogiUI.BoardState.Pieces
{
  public class Rook : Piece
  {
    private static readonly List<Path> MoveSet = new List<Path>(4)
    {
      new Path(Direction.Up, Distance.MultiStep),
      new Path(Direction.Left, Distance.MultiStep),
      new Path(Direction.Right, Distance.MultiStep),
      new Path(Direction.Down, Distance.MultiStep)
    };
    private static readonly List<Path> PromotedMoveSet = new List<Path>(8)
    {
       new Path(Direction.Up, Distance.MultiStep),
      new Path(Direction.Left, Distance.MultiStep),
      new Path(Direction.Right, Distance.MultiStep),
      new Path(Direction.Down, Distance.MultiStep),
      new Path(Direction.UpLeft),
      new Path(Direction.UpRight),
      new Path(Direction.DownLeft),
      new Path(Direction.DownRight)
    };
    public Rook(WhichPlayer owner) : base(WhichPiece.Rook, owner)
    {
    }

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