checkpoint

Gameboard.ShogiUI.BoardState/Piece.cs

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+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();
+    }
+  }
+}