Before changing Piece[,] to Dictionary<string,Piece>

Gameboard.ShogiUI.Sockets/Models/Piece.cs

@@ -1,27 +1,59 @@
 using Gameboard.ShogiUI.Sockets.ServiceModels.Socket.Types;
+using PathFinding;
+using System.Diagnostics;
 
 namespace Gameboard.ShogiUI.Sockets.Models
 {
-  public class Piece
+  [DebuggerDisplay("{WhichPiece} {Owner}")]
+  public class Piece : IPlanarElement
   {
-    public bool IsPromoted { get; }
-    public WhichPlayer Owner { get; }
     public WhichPiece WhichPiece { get; }
+    public WhichPlayer Owner { get; private set; }
+    public bool IsPromoted { get; private set; }
+    public bool IsUpsideDown => Owner == WhichPlayer.Player2;
 
-    public Piece(bool isPromoted, WhichPlayer owner, WhichPiece whichPiece)
+    public Piece(WhichPiece piece, WhichPlayer owner, bool isPromoted = false)
     {
-      IsPromoted = isPromoted;
+      WhichPiece = piece;
       Owner = owner;
-      WhichPiece = whichPiece;
+      IsPromoted = isPromoted;
     }
 
-    public Piece(Rules.Pieces.Piece piece)
+    public bool CanPromote => !IsPromoted
+      && WhichPiece != WhichPiece.King
+      && WhichPiece != WhichPiece.GoldGeneral;
+
+    public void ToggleOwnership()
     {
-      IsPromoted = piece.IsPromoted;
-      Owner = (WhichPlayer)piece.Owner;
-      WhichPiece = (WhichPiece)piece.WhichPiece;
+      Owner = Owner == WhichPlayer.Player1
+        ? WhichPlayer.Player2
+        : WhichPlayer.Player1;
     }
 
+    public void Promote() => IsPromoted = CanPromote;
+
+    public void Demote() => IsPromoted = false;
+
+    public void Capture()
+    {
+      ToggleOwnership();
+      Demote();
+    }
+
+    // TODO: There is no reason to make "new" MoveSets every time this property is accessed.
+    public MoveSet MoveSet => WhichPiece switch
+    {
+      WhichPiece.King => new MoveSet(this, MoveSets.King),
+      WhichPiece.GoldGeneral => new MoveSet(this, MoveSets.GoldGeneral),
+      WhichPiece.SilverGeneral => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.SilverGeneral),
+      WhichPiece.Bishop => new MoveSet(this, IsPromoted ? MoveSets.PromotedBishop : MoveSets.Bishop),
+      WhichPiece.Rook => new MoveSet(this, IsPromoted ? MoveSets.PromotedRook : MoveSets.Rook),
+      WhichPiece.Knight => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.Knight),
+      WhichPiece.Lance => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.Lance),
+      WhichPiece.Pawn => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.Pawn),
+      _ => throw new System.NotImplementedException()
+    };
+
     public ServiceModels.Socket.Types.Piece ToServiceModel()
     {
       return new ServiceModels.Socket.Types.Piece