Controller

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;

import java.util.ArrayList;

public class Controller {
    private Logic logic = new Logic();

    private Button[][] buttonsGameField = new Button[9][9];
    private Button bufferNumberForSelection;
    private int indexRow;
    private int indexColumn;
//    private ArrayList <Integer> errorIndexRow = new ArrayList<>();
//    private ArrayList <Integer> errorIndexColumn = new ArrayList<>();
//    private int errorSize = 0;
    private boolean flagHelp = false;

    @FXML
    private Button numberForSelection1;

    @FXML
    private Button buttonHelp;

    @FXML
    private void clickedButtonHelp() {

        backgroundUpdateHelp();

        int result = logic.clickedButtonHelp();
        indexRow = result / 10;
        indexColumn = result % 10;

        buttonsGameField[indexRow][indexColumn].setText(String.valueOf(logic.getGameFieldElement(indexRow, indexColumn)));
        flagHelp = true;

        buttonsGameField[indexRow][indexColumn].setStyle("-fx-background-color: yellow; -fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\"");
    }

    private void backgroundUpdateHelp() {
        if (flagHelp) {
            buttonsGameField[indexRow][indexColumn].setStyle("-fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\"");
            flagHelp = false;
        }
    }

    public Controller() {
        for (int row = 0; row < 9; row++) {
            for (int column = 0; column < 9; column++) {
                buttonsGameField[row][column] = new Button("");
                buttonsGameField[row][column].setMinSize(50, 50);
                buttonsGameField[row][column].setStyle("-fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\" ");
            }
        }
        fillingInTheField();
    }

    private void fillingInTheField() {
        logic.fillingInTheField();
        for (int i = 0; i < 9; i++) {
            for (int j = 0; j < 9; j++) {
                if (logic.getGameFieldElement(i,j) != 0) {
                    buttonsGameField[i][j].setText(String.valueOf(logic.getGameFieldElement(i, j)));
                }
            }
        }
    }

    private void onHighlightingSelectedNumbers() { //для подсказок//
        for (int i = 0; i < 9; i++) {
            for (int j = 0; j < 9; j++) {
                if (buttonsGameField[i][j].getText().equals(bufferNumberForSelection.getText())) {
                    buttonsGameField[i][j].setStyle("-fx-background-color: green; -fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\" ");
                }
            }
        }
        for (int i = 0; i < errorSize; i++) {
            buttonsGameField[errorIndexRow.get(i)][errorIndexColumn.get(i)].setStyle("-fx-background-color: red; -fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\" ");;
        }
    }

    private void offHighlightingSelectedNumbers() { //для подсказок//
        backgroundUpdateHelp();

        for (int i = 0; i < 9; i++) {
            for (int j = 0; j < 9; j++) {
                if (buttonsGameField[i][j].getText().equals(bufferNumberForSelection.getText())) {
                    //buttonsGameField[i][j].setStyle(null);
                    buttonsGameField[i][j].setStyle("-fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\" ");
                }
            }
        }
    }

    @FXML
    private GridPane gridMap;

    @FXML
    private void clickedNumberForSelection(ActionEvent actionEvent) {
        bufferNumberForSelection.setStyle(null);
        offHighlightingSelectedNumbers();

        bufferNumberForSelection = (Button) actionEvent.getSource();
        logic.setSelectedNumber(Integer.parseInt(bufferNumberForSelection.getText()));
        bufferNumberForSelection.setStyle("-fx-background-color: green");

        onHighlightingSelectedNumbers();
    }

    @FXML
    public void initialize() {
        bufferNumberForSelection = numberForSelection1;
        numberForSelection1.setStyle("-fx-background-color: green");;

        for (int row = 0; row < 9; row++) {
            for (int column = 0; column < 9; column++) {
                gridMap.add(buttonsGameField[row][column], row, column);

                buttonsGameField[row][column].setOnAction(this::clickedButtonGameField);
            }
        }
    }

    public void searchButtonGameField(Button buffer) {
        for (int i = 0; i < 9; i++) {
            for (int j = 0; j < 9; j++) {
                if(buffer == buttonsGameField[i][j]) {
                    logic.setGameFieldElement(i, j);
                    indexRow = i;
                    indexColumn = j;
                    return;
                }
            }
        }
    }

    public void clickedButtonGameField(ActionEvent actionEvent) {
        backgroundUpdateHelp();

        Button buffer = (Button) actionEvent.getSource();
        buffer.setText(String.valueOf(logic.getSelectedNumber()));

        searchButtonGameField(buffer);

        if (logic.checkGameField(indexRow, indexColumn)) { // для жизней //
            buffer.setStyle("-fx-background-color: green; -fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\" "); //для подсказок//
            correctionError();
        } else {
            addError();
            buffer.setStyle("-fx-background-color: red; -fx-font-weight:bold; -fx-font-size: 24; -fx-font-family: \"System\" "); //для жизней//
        }
        System.out.println("doClick");
    }

    private void addError() {

        boolean repetitionFound = false;

        for (int i = 0; i < errorSize; i++) { // добавление ошибки
            if (indexRow == errorIndexRow.get(i) && indexColumn == errorIndexColumn.get(i)) {
                repetitionFound = true;
                break;
            }
        }

        if (!repetitionFound) {
            errorIndexRow.add(indexRow);
            errorIndexColumn.add(indexColumn);
            errorSize++;
        }
        System.out.println(errorIndexColumn.size());
    }

    private void correctionError() {

        for (int i = 0; i < errorSize; i++) { // добавление ошибки
            if (indexRow == errorIndexRow.get(i) && indexColumn == errorIndexColumn.get(i)) {
                errorIndexRow.remove(i);
                errorIndexColumn.remove(i);
                errorSize--;
                break;
            }
        }
        System.out.println(errorIndexColumn.size());
    }



}