SimpleEntry<Integer, Integer> setRandomCell() {
SimpleEntry<Integer, Integer> cellFilled = null;
if (!game.isAllBoardFilled() && hints >= 1) {
hints--;
Random r = new Random(System.nanoTime());
int lineStart = r.nextInt(board.getSudokuSize());
int columnStart = r.nextInt(board.getSudokuSize());
boolean inserted = false;
while (!inserted) {
if (game.getCellNumber(lineStart, columnStart) == 0) {
game.setCellNumber(lineStart, columnStart, board.getValueCell(lineStart, columnStart));
cellFilled = new SimpleEntry<Integer, Integer>(lineStart, columnStart);
inserted = true;
} else {
if (columnStart == 8) {
if (lineStart == 8) {
lineStart = 0;
columnStart = 0;
} else {
lineStart++;
columnStart = 0;
}
} else columnStart++;
}
}
}
if (cellFilled == null) cellFilled = new SimpleEntry<Integer, Integer>(-1, -1);
return cellFilled;
}
