Shogi/Gameboard.ShogiUI.Sockets/Repositories/CouchModels/Move.cs

using Gameboard.ShogiUI.Sockets.ServiceModels.Socket.Types;
using System.Numerics;

namespace Gameboard.ShogiUI.Sockets.Repositories.CouchModels
{
  public class Move
  {
    /// <summary>
    /// A board coordinate, like A3 or G6. When null, look for PieceFromHand to exist.
    /// </summary>
    public string? From { get; set; }

    public bool IsPromotion { get; set; }

    /// <summary>
    /// The piece placed from the player's hand.
    /// </summary>
    public WhichPiece? PieceFromHand { get; set; }

    /// <summary>
    /// A board coordinate, like A3 or G6.
    /// </summary>
    public string To { get; set; }

    /// <summary>
    /// Default constructor and setters are for deserialization.
    /// </summary>
    public Move()
    {
      To = string.Empty;
    }

    public Move(Models.Move move)
    {
      if (move.From.HasValue)
      {
        From = ToBoardNotation(move.From.Value);
      }
      IsPromotion = move.IsPromotion;
      To = ToBoardNotation(move.To);
      PieceFromHand = move.PieceFromHand;
    }

    private static readonly char A = 'A';
    private static string ToBoardNotation(Vector2 vector)
    {
      var file = (char)(vector.X + A);
      var rank = vector.Y + 1;
      return $"{file}{rank}";
    }

    public Models.Move ToDomainModel() => PieceFromHand.HasValue
      ? new(PieceFromHand.Value, To)
      : new(From!, To, IsPromotion);
  }
}