checkpoint

Shogi.Domain/ValueObjects/Pieces/Bishop.cs

@@ -0,0 +1,47 @@
+using Shogi.Domain.ValueObjects.Movement;
+using System.Collections.ObjectModel;
+
+namespace Shogi.Domain.ValueObjects
+{
+    internal record class Bishop : Piece
+    {
+        private static readonly ReadOnlyCollection<Path> BishopPaths = new(new List<Path>(4)
+        {
+            new Path(Direction.ForwardLeft, Distance.MultiStep),
+            new Path(Direction.ForwardRight, Distance.MultiStep),
+            new Path(Direction.BackwardLeft, Distance.MultiStep),
+            new Path(Direction.BackwardRight, Distance.MultiStep)
+        });
+
+        public static readonly ReadOnlyCollection<Path> PromotedBishopPaths = new(new List<Path>(8)
+        {
+            new Path(Direction.Forward),
+            new Path(Direction.Left),
+            new Path(Direction.Right),
+            new Path(Direction.Backward),
+            new Path(Direction.ForwardLeft, Distance.MultiStep),
+            new Path(Direction.ForwardRight, Distance.MultiStep),
+            new Path(Direction.BackwardLeft, Distance.MultiStep),
+            new Path(Direction.BackwardRight, Distance.MultiStep)
+        });
+
+        public static readonly ReadOnlyCollection<Path> Player2Paths =
+            BishopPaths
+            .Select(p => p.Invert())
+            .ToList()
+            .AsReadOnly();
+
+        public static readonly ReadOnlyCollection<Path> Player2PromotedPaths =
+            PromotedBishopPaths
+            .Select(p => p.Invert())
+            .ToList()
+            .AsReadOnly();
+
+        public Bishop(WhichPlayer owner, bool isPromoted = false)
+            : base(WhichPiece.Bishop, owner, isPromoted)
+        {
+        }
+
+        public override IEnumerable<Path> MoveSet => IsPromoted ? PromotedBishopPaths : BishopPaths;
+    }
+}