Merge pull request 'castling-saved' (#3) from castling-saved into master

Reviewed-on: #3

src/backend/Board.java

@@ -165,12 +165,14 @@ public class Board {
                                      board[x][y] == null;
 
                 // Move piece
+                previousBoard = cloneBoard(board);
                 board[x][y] = selectedPiece;
                 board[selectedX][selectedY] = null;
                 selectedPiece.setX(x);
                 selectedPiece.setY(y);
                 selectedPiece.setMoved(true); // ✅ Marque la pièce comme ayant bougé
 
+
              // Déplacement de la tour si roque
                 if (selectedPiece.getType() == PieceType.King && Math.abs(x - selectedX) == 2) {
                    
@@ -306,11 +308,35 @@ public class Board {
         }
         return false;
     }
+    
+    private Piece[][] previousBoard = null;
+
+    private Piece[][] cloneBoard(Piece[][] original) {
+        Piece[][] copy = new Piece[width][height];
+        for (int i = 0; i < width; i++) {
+            for (int j = 0; j < height; j++) {
+                if (original[i][j] != null) {
+                    Piece p = original[i][j];
+                    copy[i][j] = new Piece(p.getX(), p.getY(), p.isWhite(), p.getType());
+                    copy[i][j].setMoved(p.hasMoved());
+                }
+            }
+        }
+        return copy;
+    }
 
     public void undoLastMove() {
-        // TODO
+        if (previousBoard != null) {
+            board = cloneBoard(previousBoard);      // Restore the board
+            previousBoard = null;                   // Clear saved state
+            hasSelectedPiece = false;               // Deselect piece
+            highlightedSquares.clear();             // Remove highlights
+            turnWhite = !turnWhite;                 // Go back to previous player
+            turnNumber--;                           // Go back a turn
+        }
     }
 
+
     public Board(Board board) {
         // TODO
     }