using Gameboard.ShogiUI.Sockets.ServiceModels.Types;
using System;
using System.Text;
using System.Text.RegularExpressions;

namespace Gameboard.ShogiUI.Sockets.Extensions
{
  public static class ModelExtensions
  {
    public static string GetShortName(this Models.Piece self)
    {
      var name = self.WhichPiece switch
      {
        WhichPiece.King => " K ",
        WhichPiece.GoldGeneral => " G ",
        WhichPiece.SilverGeneral => self.IsPromoted ? "^S " : " S ",
        WhichPiece.Bishop => self.IsPromoted ? "^B " : " B ",
        WhichPiece.Rook => self.IsPromoted ? "^R " : " R ",
        WhichPiece.Knight => self.IsPromoted ? "^k " : " k ",
        WhichPiece.Lance => self.IsPromoted ? "^L " : " L ",
        WhichPiece.Pawn => self.IsPromoted ? "^P " : " P ",
        _ => " ? ",
      };
      if (self.Owner == WhichPlayer.Player2)
        name = Regex.Replace(name, @"([^\s]+)\s", "$1.");
      return name;
    }

    public static string PrintStateAsAscii(this Models.Shogi self)
    {
      var builder = new StringBuilder();
      builder.Append("               Player 2(.)");
      builder.AppendLine();
      for (var y = 8; y >= 0; y--)
      {
        builder.Append("- ");
        for (var x = 0; x < 8; x++) builder.Append("- - ");
        builder.Append("- -");
        builder.AppendLine();
        builder.Append('|');
        for (var x = 0; x < 9; x++)
        {
          var piece = self.Board[x, y];
          if (piece == null)
          {
            builder.Append("   ");
          }
          else
          {
            builder.AppendFormat("{0}", piece.GetShortName());
          }
          builder.Append('|');
        }
        builder.AppendLine();
      }
      builder.Append("- ");
      for (var x = 0; x < 8; x++) builder.Append("- - ");
      builder.Append("- -");
      builder.AppendLine();
      builder.Append("               Player 1");
      return builder.ToString();
    }
  }
}