undo

src/backend/Board.java

@@ -265,12 +265,29 @@ public class Board {
 	public void getLastMove (int x, int y) {// it saves the current state before making a move
 	      
 	      previousStates.add(new Board(this)); // Use the existing constructor to create a copy
+	      getLastMove(selectedX, selectedY);
 	}
 	
 	public void undoLastMove() { 
 		
+		if (!previousStates.isEmpty()) {
+		          Board previousState = previousStates.remove(previousStates.size() - 1); // Get the last state
+		          this.colNum = previousState.colNum;
+		          this.lineNum = previousState.lineNum;
+		          this.turnNumber = previousState.turnNumber;
+		          this.isWhiteTurn = previousState.isWhiteTurn;
+		          this.pieces = new ArrayList<>(previousState.pieces); // Restore pieces
+		          // Reset selected positions and highlighted squares
+		          this.selectedX = previousState.selectedX;
+		          this.selectedY = previousState.selectedY;
+		          this.highlightedSquares = new ArrayList<>(previousState.highlightedSquares);
+		 } else {
+		          System.out.println("There are no moves to undo.");
+		      }
+		  }
+		
+		
 	
-	}
 
 	public Board(Board board) {
 	    this.colNum = board.colNum;

src/backend/Game.java

@@ -107,6 +107,7 @@ public class Game extends Thread {
 		board.undoLastMove();
 	}
 
+
 	public void toggleAI(boolean isWhite) {
 		this.activationAIFlags[isWhite?1:0] = !this.activationAIFlags[isWhite?1:0];
 	}