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

namespace PathFinding
{
  public class MoveSet
  {
    private readonly IPlanarElement element;
    private readonly ICollection<Move> moves;
    private readonly ICollection<Move> upsidedownMoves;

    public MoveSet(IPlanarElement element, ICollection<Move> moves)
    {
      this.element = element;
      this.moves = moves;
      upsidedownMoves = moves.Select(_ => new Move(Vector2.Negate(_.Direction), _.Distance)).ToList();
    }

    public ICollection<Move> GetMoves() => element.IsUpsideDown ? upsidedownMoves : moves;

  }
}