using System.Diagnostics;

namespace Gameboard.ShogiUI.BoardState
{
  [DebuggerDisplay("{WhichPiece} {Owner}")]
  public class Piece
  {
    public WhichPiece WhichPiece { get; }
    public WhichPlayer Owner { get; private set; }
    public bool IsPromoted { get; private set; }

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

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

    public string ShortName => WhichPiece switch
    {
      WhichPiece.King => " K ",
      WhichPiece.GoldenGeneral => " G ",
      WhichPiece.SilverGeneral => IsPromoted ? "^S^" : " S ",
      WhichPiece.Bishop => IsPromoted ? "^B^" : " B ",
      WhichPiece.Rook => IsPromoted ? "^R^" : " R ",
      WhichPiece.Knight => IsPromoted ? "^k^" : " k ",
      WhichPiece.Lance => IsPromoted ? "^L^" : " L ",
      WhichPiece.Pawn => IsPromoted ? "^P^" : " P ",
      _ => " ? ",
    };

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

    public void Promote() => IsPromoted = true;

    public void Demote() => IsPromoted = false;

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