undo last move

src/backend/Board.java

@@ -1,6 +1,7 @@
 package backend;
 
 import java.util.ArrayList;
+import java.util.Stack;
 
 public class Board {
 	private Piece[][] board;
@@ -10,6 +11,7 @@ public class Board {
 	private int selectedX = -1;
 	private int selectedY = -1;
 	private boolean[][] highlightedSquares;
+    private Stack<String[]> undoStack = new Stack<>();
 	
 	public Board(int colNum, int lineNum) {
 		this.width = colNum; // col move x
@@ -140,25 +142,17 @@ public class Board {
 
 	        } else if (highlightedSquares[x][y]) {
 	            // Move the piece
-	            Piece selectedPiece = board[selectedX][selectedY];
+	        	Move move = new Move(selectedX, selectedY, x, y);
+	        	playMove(move); // This handles moving the piece AND saving the undo state.
 
-	            board[x][y] = selectedPiece;              // Move to new square
-	            board[selectedX][selectedY] = null;       // Clear old square
+	        	selectedX = -1;
+	        	selectedY = -1; // Unselect
 
-	            selectedPiece.x = x;
-	            selectedPiece.y = y;
-
-	            turn++; // Next player's turn
-
-	            selectedX = -1;
-	            selectedY = -1; // Unselect
-	            
-	            clearHighlights();
-	            highlightKingInCheck();
-	            System.out.println(toString()); // Work but not sure ?
+	        	clearHighlights();
+	        	highlightKingInCheck();
+	        	System.out.println(toString());
 	        }
-	    }
-	    
+	    }    
 	}
 		
 	public boolean isSelected(int x, int y) {
@@ -248,7 +242,7 @@ public class Board {
 	        Move move = legalMoves.get(i);
 	        highlightedSquares[move.getToX()][move.getToY()] = true; // assuming Move has toX and toY fields
 	    }
-	} // KDO FLO
+	} 
 
 	private ArrayList<Move> getLegalMoves(Piece piece) {
 	    ArrayList<Move> moves = new ArrayList<>();
@@ -380,17 +374,43 @@ public class Board {
 
 	
 	public void undoLastMove() {
-		//TODO
-		
+	    if (!undoStack.isEmpty()) {
+	        String[] lastState = undoStack.pop();
+
+	        // Load the board from the saved state
+	        Board previousBoard = new Board(lastState);
+
+	        // Copy the previousBoard's fields into current board instance
+	        this.board = previousBoard.board;
+	        this.turn = previousBoard.turn;
+	        this.width = previousBoard.width;
+	        this.height = previousBoard.height;
+	        this.highlightedSquares = previousBoard.highlightedSquares;
+
+	        // Clear selection and highlights as well (optional)
+	        this.selectedX = -1;
+	        this.selectedY = -1;
+	        clearHighlights();
+
+	        System.out.println("Undo performed.");
+	        System.out.println(this.toString());
+	    } else {
+	        System.out.println("No moves to undo.");
+	    }
 	}
 
+
 	public Board(Board board) {
 		//TODO
 
 	}
 	
 	public void playMove(Move move) {
-		Piece piece = board[move.getFromX()][move.getFromY()];
+	    // Save current state before move for undo
+	    undoStack.push(toFileRep());
+
+	    // existing move logic
+	    Piece piece = board[move.getFromX()][move.getFromY()];
 	    board[move.getToX()][move.getToY()] = piece;
 	    board[move.getFromX()][move.getFromY()] = null;
 	    piece.x = move.getToX();