Main.java

package com.azoraqua.passwordgenerator.gui;

import com.azoraqua.passwordgenerator.generator.password.CharacterSet;
import com.azoraqua.passwordgenerator.generator.password.PasswordGenerator;

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.StringSelection;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.List;

public class Main {

    private static JTextField passwordField;
    private static JButton generateBtn;

    private static int length = 16;
    private static List<CharacterSet> selectedChararacters = new ArrayList<>();

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setTitle("Password Generator");
        frame.setSize(1280, 720);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.X_AXIS));

        passwordField = new JTextField(36);
        passwordField.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 16));
        passwordField.setHorizontalAlignment(JTextField.CENTER);
        passwordField.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if(!passwordField.getText().isEmpty()) {
                    Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                    clipboard.setContents(new StringSelection(passwordField.getText()), null);

                    JOptionPane.showMessageDialog(frame, "Password is copied to clipboard.");
                }
            }
        });
        frame.add(passwordField, Box.createGlue());

        generateBtn = new JButton("Generate");
        generateBtn.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if(!selectedChararacters.isEmpty()) {
                    PasswordGenerator passwordGenerator = new PasswordGenerator(length, selectedChararacters.toArray(new CharacterSet[selectedChararacters.size()]));

                    passwordField.setText(String.valueOf(passwordGenerator.generate()));
                } else {
                    JOptionPane.showMessageDialog(frame, "Please select at least one Character type.");
                }
            }
        });
        frame.add(generateBtn, Box.createGlue());

        JToggleButton upperCaseToggle = new JToggleButton("Uppercase");
        upperCaseToggle.addChangeListener(e -> {
            if(selectedChararacters.contains(CharacterSet.UPPERCASE)) {
                selectedChararacters.remove(CharacterSet.UPPERCASE);
            } else {
                selectedChararacters.add(CharacterSet.UPPERCASE);
            }
        });

        JToggleButton lowercaseToggle = new JToggleButton("Lowercase");
        lowercaseToggle.addChangeListener(e -> {
            if(selectedChararacters.contains(CharacterSet.LOWERCASE)) {
                selectedChararacters.remove(CharacterSet.LOWERCASE);
            } else {
                selectedChararacters.add(CharacterSet.LOWERCASE);
            }
        });

        JToggleButton numericToggle = new JToggleButton("Numeric");
        numericToggle.addChangeListener(e -> {
            if(selectedChararacters.contains(CharacterSet.NUMERIC)) {
                selectedChararacters.remove(CharacterSet.NUMERIC);
            } else {
                selectedChararacters.add(CharacterSet.NUMERIC);
            }
        });

        JToggleButton symbolToggle = new JToggleButton("Symbols");
        symbolToggle.addChangeListener(e -> {
            if(selectedChararacters.contains(CharacterSet.SYMBOLS)) {
                selectedChararacters.remove(CharacterSet.SYMBOLS);
            } else {
                selectedChararacters.add(CharacterSet.SYMBOLS);
            }
        });

        frame.add(upperCaseToggle);
        frame.add(lowercaseToggle);
        frame.add(numericToggle);
        frame.add(symbolToggle);

        frame.pack();
        frame.setVisible(true);
    }
}