possible moves highlighted

src/backend/Board.java

@@ -20,6 +20,7 @@ public class Board {
         this.selectedY = -1;
         this.turnNumber = 0;
         this.isTurnWhite = true;
+        Move.clearHighlightedPositions(); // Ensure no highlights at start
     }
 
     public int getWidth() {
@@ -95,6 +96,7 @@ public class Board {
         selectedY = -1;
         turnNumber = 0;
         isTurnWhite = true;
+        Move.clearHighlightedPositions();
     }
 
     public String toString() {
@@ -130,29 +132,48 @@ public class Board {
             return;
         }
 
+        Piece clickedPiece = getPieceAt(x, y);
         if (selectedX == -1 && selectedY == -1) {
-            Piece piece = getPieceAt(x, y);
+            if (clickedPiece != null) {
-            if (piece != null) {
+                System.out.println("Selected piece at (" + x + "," + y + "): " + clickedPiece.getType() + ", isWhite=" + clickedPiece.isWhite());
-                System.out.println("Selected piece at (" + x + "," + y + "): " + piece.getType() + ", isWhite=" + piece.isWhite());
                 selectedX = x;
                 selectedY = y;
+                Move.setHighlightedPositions(this, clickedPiece);
             } else {
                 System.out.println("No piece at (" + x + "," + y + ")");
             }
         } else {
             System.out.println("Selected position: (" + selectedX + "," + selectedY + ")");
+            Piece selectedPiece = getPieceAt(selectedX, selectedY);
+            if (selectedPiece == null) {
+                System.out.println("No piece at (" + selectedX + "," + selectedY + ")");
+                selectedX = -1;
+                selectedY = -1;
+                Move.clearHighlightedPositions();
+                return;
+            }
+            // If clicking the same position, unselect
             if (selectedX == x && selectedY == y) {
                 System.out.println("Unselecting piece");
                 selectedX = -1;
                 selectedY = -1;
-            } else {
+                Move.clearHighlightedPositions();
-                Piece selectedPiece = getPieceAt(selectedX, selectedY);
+            }
-                if (selectedPiece != null) {
+            // If clicking another piece of the same color, select that piece instead
+            else if (clickedPiece != null && clickedPiece.isWhite() == selectedPiece.isWhite()) {
+                System.out.println("Switching selection to piece at (" + x + "," + y + "): " + clickedPiece.getType() + ", isWhite=" + clickedPiece.isWhite());
+                selectedX = x;
+                selectedY = y;
+                Move.setHighlightedPositions(this, clickedPiece);
+            }
+            // Otherwise, attempt to move
+            else {
                 if (!selectedPiece.canMoveTo(x, y, this)) {
                     System.out.println("Invalid move for " + selectedPiece.getType() + " from (" +
                             selectedX + "," + selectedY + ") to (" + x + "," + y + ")");
                     selectedX = -1;
                     selectedY = -1;
+                    Move.clearHighlightedPositions();
                     return;
                 }
                 System.out.println("Moving piece from (" + selectedX + "," + selectedY + ") to (" + x + "," + y + ")");
@@ -166,11 +187,7 @@ public class Board {
                 playMove(move);
                 selectedX = -1;
                 selectedY = -1;
-                } else {
+                Move.clearHighlightedPositions();
-                    System.out.println("No piece at (" + selectedX + "," + selectedY + ")");
-                    selectedX = -1;
-                    selectedY = -1;
-                }
             }
         }
     }
@@ -179,6 +196,10 @@ public class Board {
         return selectedX == x && selectedY == y;
     }
 
+    public boolean isHighlighted(int x, int y) {
+        return Move.isHighlighted(x, y);
+    }
+
     public void playMove(Move move) {
         System.out.println("playMove: Moving from (" + move.getFromX() + "," + move.getFromY() + ") to (" +
                 move.getToX() + "," + move.getToY() + ")");
@@ -215,10 +236,6 @@ public class Board {
         // TODO
     }
 
-    public boolean isHighlighted(int x, int y) {
-        return false;
-    }
-
     public void undoLastMove() {
         // TODO
     }

src/backend/Move.java

@@ -7,6 +7,7 @@ public class Move {
     private int toY;
     private Piece pieceMoved;
     private Piece pieceCaptured;
+    private static String[] highlightedPositions = new String[0]; // Store highlighted positions
 
     public Move(int fromX, int fromY, int toX, int toY, Piece pieceMoved, Piece pieceCaptured) {
         this.fromX = fromX;
@@ -41,6 +42,31 @@ public class Move {
         return pieceCaptured;
     }
 
+    // Static method to calculate and set highlighted positions for a piece
+    public static void setHighlightedPositions(Board board, Piece piece) {
+        if (piece == null) {
+            highlightedPositions = new String[0];
+        } else {
+            highlightedPositions = calculateValidMoves(board, piece);
+        }
+    }
+
+    // Static method to clear highlighted positions
+    public static void clearHighlightedPositions() {
+        highlightedPositions = new String[0];
+    }
+
+    // Static method to check if a position is highlighted
+    public static boolean isHighlighted(int x, int y) {
+        String position = x + "," + y;
+        for (int i = 0; i < highlightedPositions.length; i++) {
+            if (highlightedPositions[i] != null && highlightedPositions[i].equals(position)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     // Static method to calculate all valid moves for a piece
     public static String[] calculateValidMoves(Board board, Piece piece) {
         String[] validMoves = new String[32]; // Allocate space for up to 32 moves