using PathFinding;
using System.Diagnostics;

namespace Gameboard.ShogiUI.BoardState.Pieces
{
  [DebuggerDisplay("{WhichPiece} {Owner}")]
  public abstract class Piece : IPlanarElement
  {
    protected MoveSet promotedMoveSet;
    protected MoveSet moveSet;

    public MoveSet MoveSet => IsPromoted ? promotedMoveSet : moveSet;
    public abstract Piece DeepClone();
    public WhichPiece WhichPiece { get; }
    public WhichPlayer Owner { get; private set; }
    public bool IsPromoted { get; private set; }
    public bool IsUpsideDown => Owner == WhichPlayer.Player2;

    public Piece(WhichPiece piece, WhichPlayer owner)
    {
      WhichPiece = piece;
      Owner = owner;
      IsPromoted = false;
    }

    public bool CanPromote => !IsPromoted
      && WhichPiece != WhichPiece.King
      && WhichPiece != WhichPiece.GoldenGeneral;

    public void ToggleOwnership()
    {
      Owner = Owner == WhichPlayer.Player1
        ? WhichPlayer.Player2
        : WhichPlayer.Player1;
    }

    public void Promote() => IsPromoted = CanPromote;

    public void Demote() => IsPromoted = false;

    public void Capture()
    {
      ToggleOwnership();
      Demote();
    }
  }
}