import org.omg.CORBA.Environment;

import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.text.Position;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeListener;
import java.io.*;

public class mainForm {
    private static JFrame frame;
    private JPanel panelMain;
    private JComboBox comboBox1;
    private JComboBox comboBox2;
    private JTextPane textPane;
    private Font[] fonts;

    Font defaultFont;
    Font forChangingFont;

    DefaultListModel<Integer> startIndexesModel;
    DefaultListModel<Integer> lengthsModel;
    DefaultListModel<Integer> IgnoreStartIndexesModel;
    JList<Integer> startIndexes;
    JList<Integer> lengths;
    JList<Integer> IgnoreStartIndexes;


    public mainForm() {

        // Инициализация массивов
        startIndexesModel = new DefaultListModel<>();
        lengthsModel = new DefaultListModel<>();
        IgnoreStartIndexesModel = new DefaultListModel<>();
        startIndexes = new JList<>(startIndexesModel);
        lengths = new JList<>(lengthsModel);
        IgnoreStartIndexes = new JList<>(IgnoreStartIndexesModel);

        GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
        fonts = graphicsEnvironment.getAllFonts();

        frame = new JFrame("");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(null);
        textPane = new JTextPane();
        comboBox1 = new JComboBox<>(fonts);
        comboBox2 = new JComboBox<>(fonts);
        JLabel label = new JLabel();
        JLabel label2 = new JLabel();

        textPane.setBounds(10,10, 300, 100);
        textPane.setText("В стране проживает 1434577 студента. 146 из которых в вашем городе. 1444 в соседнем.");
        comboBox1.setBounds(10,50+70,150,26);
        comboBox2.setBounds(10,50+70+36,150,26);
        label.setBounds(150+20, 50+70, 150,20);
        label.setText("Шрифт всего текста");
        label2.setBounds(150+20, 50+70+36, 200,20);
        label2.setText("Шрифт текста для изменения");

        textPane.setFont(new Font("Segoe UI", Font.PLAIN, 18));
        frame.add(textPane);
        frame.add(comboBox1);
        frame.add(comboBox2);
        frame.add(label);
        frame.add(label2);
        frame.setBounds(0,0, 380, 250);

        DefaultListCellRenderer defRenderer = new DefaultListCellRenderer() {
            @Override
            public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
                if(value != null)
                    value = ((Font)value).getFontName();
                return super.getListCellRendererComponent(list, value, index,
                        isSelected, cellHasFocus);
            }
        };


        comboBox1.setRenderer(defRenderer );
        for(int i = 0; i < fonts.length; i++)
            if(fonts[i].getFontName().equals("Segoe UI")) {
                comboBox1.setSelectedIndex(i);
                comboBox2.setSelectedIndex(i);
                break;
            }

        comboBox2.setRenderer(defRenderer );

        frame.setVisible(true);


        comboBox1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Font font = (Font)comboBox1.getSelectedItem();
                defaultFont = new Font(font.getFontName(), font.getStyle(), 18);
                textPane.setFont(defaultFont);
            }
        });
        comboBox2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Font font = (Font)comboBox2.getSelectedItem();
                forChangingFont = new Font(font.getFontName(), font.getStyle(), 18);
                parseText();
            }
        });
        textPane.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_F2)
                    ProcessKey(true);
                else
                    ProcessKey(false);
                super.keyReleased(e);
            }
        });
    }

    public static void main(String[] args) {
        mainForm form = new mainForm();
    }


    private void parseText() {
        { // Изменить шрифт всего текста на дефолтный
            SimpleAttributeSet attrSet = new SimpleAttributeSet();
            StyleConstants.setFontFamily(attrSet, defaultFont.getFamily());
            StyleConstants.setBold(attrSet, defaultFont.isBold());
            StyleConstants.setItalic(attrSet, defaultFont.isItalic());
            StyledDocument styledDocument = textPane.getStyledDocument();
            styledDocument.setCharacterAttributes(0, textPane.getText().length(), attrSet, true);
        }

        int startIndex = -1;
        int length = 1;
        lengthsModel = new DefaultListModel<>();
        startIndexesModel = new DefaultListModel<>();
        String text = textPane.getText();
        for (int i = text.length() - 1; i > 0; i--) {
            if (text.charAt(i) >= '0' && text.charAt(i) <= '9')
                if (startIndex == -1)
                    startIndex = i;
                else length++;
            else {
                if (length > 3)
                    if (!IgnoreStartIndexesModel.contains(startIndex - length + 1)) {
                        lengthsModel.addElement(length);
                        startIndexesModel.addElement(startIndex - length + 1);

                        SimpleAttributeSet attrSet = new SimpleAttributeSet();
                        StyleConstants.setFontFamily(attrSet, forChangingFont.getFamily());
                        StyleConstants.setBold(attrSet, forChangingFont.isBold());
                        StyleConstants.setItalic(attrSet, forChangingFont.isItalic());
                        StyledDocument styledDocument = textPane.getStyledDocument();
                        styledDocument.setCharacterAttributes(startIndex - length + 1, length, attrSet, true);
                    }
                length = 1;
                startIndex = -1;
            }
        }
    }

    private void ProcessKey(boolean isF2)
    {
        int selectionStart = textPane.getCaretPosition();
        for (int j = 0; j < startIndexesModel.size(); j++)
            if (selectionStart >= startIndexesModel.elementAt(j) &&
                    selectionStart <= (startIndexesModel.elementAt(j) + lengthsModel.elementAt(j)))
                if (isF2)
                {
                    int numbersInRow = 0;
                    for (int k = (startIndexesModel.elementAt(j) + lengthsModel.elementAt(j)) - 1; k > startIndexesModel.elementAt(j); k--)
                    {
                        numbersInRow++;
                        if (numbersInRow % 3 == 0)
                        {
                            for (int a = 0; a < IgnoreStartIndexesModel.size(); a++)
                                if (IgnoreStartIndexesModel.elementAt(a) > k)
                                    IgnoreStartIndexesModel.set(a, IgnoreStartIndexesModel.elementAt(a) + 1);
                            textPane.setText(textPane.getText().substring(0,k) + " " + textPane.getText().substring(k--));
                            lengthsModel.set(j, lengthsModel.elementAt(j) + 1);
                            numbersInRow++;
                        }
                    }
                    parseText();
                    textPane.select(selectionStart,selectionStart);
                    break;
                }
                else
                {
                    IgnoreStartIndexesModel.addElement(startIndexesModel.elementAt(j));
                    parseText();
                    textPane.select(selectionStart,selectionStart);
                    break;
                }
    }
}