SignupPanel.java

package banking.panels;

import javax.swing.*;
import java.awt.*;
import banking.BankingGUI;
import banking.StyledComponents;

public class SignupPanel extends JPanel {
    public SignupPanel(BankingGUI app) {
        setLayout(new BorderLayout());
        setBackground(BankingGUI.BACKGROUND);

        // Header
        JPanel header = StyledComponents.createGradientPanel(
                new Color(16, 185, 129),
                new Color(5, 150, 105)
        );
        header.setPreferredSize(new Dimension(750, 100));
        header.setLayout(new GridBagLayout());

        JLabel headerLabel = new JLabel("Create Your Account");
        headerLabel.setFont(new Font("Segoe UI", Font.BOLD, 28));
        headerLabel.setForeground(Color.WHITE);
        header.add(headerLabel);

        // Main Card
        JPanel mainCard = new JPanel();
        mainCard.setBackground(BankingGUI.CARD_BG);
        mainCard.setLayout(new GridBagLayout());
        mainCard.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createLineBorder(new Color(55, 65, 81), 2),
                BorderFactory.createEmptyBorder(30, 50, 30, 50)
        ));

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(8, 8, 8, 8);
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 0;
        gbc.anchor = GridBagConstraints.CENTER;

        // Username Label
        JLabel userLabel = createLabel("Username");
        gbc.gridy = 0;
        mainCard.add(userLabel, gbc);

        // Username Field
        JTextField nameField = createModernTextField();
        gbc.gridy = 1;
        mainCard.add(nameField, gbc);

        // Password Label
        JLabel passLabel = createLabel("Password (4 digits)");
        gbc.gridy = 2;
        mainCard.add(passLabel, gbc);

        // Password Field
        JPasswordField passField = createModernPasswordField();
        gbc.gridy = 3;
        mainCard.add(passField, gbc);

        // Confirm Password Label
        JLabel confirmLabel = createLabel("Confirm Password");
        gbc.gridy = 4;
        mainCard.add(confirmLabel, gbc);

        // Confirm Password Field
        JPasswordField confirmField = createModernPasswordField();
        gbc.gridy = 5;
        mainCard.add(confirmField, gbc);

        // Buttons Panel - SIDE BY SIDE
        JPanel buttonPanel = new JPanel(new GridLayout(1, 2, 10, 0));
        buttonPanel.setOpaque(false);
        buttonPanel.setPreferredSize(new Dimension(320, 45));

        JButton createBtn = StyledComponents.createStyledButton(
                "Create Account",
                new Color(16, 185, 129),
                Color.WHITE,
                150,
                45
        );

        JButton backBtn = StyledComponents.createStyledButton(
                "Back",
                new Color(75, 85, 99),
                Color.WHITE,
                150,
                45
        );

        buttonPanel.add(createBtn);
        buttonPanel.add(backBtn);

        gbc.gridy = 6;
        gbc.insets = new Insets(20, 8, 8, 8);
        mainCard.add(buttonPanel, gbc);

        // Wrapper with ScrollPane
        JPanel wrapper = new JPanel(new GridBagLayout());
        wrapper.setBackground(BankingGUI.BACKGROUND);
        wrapper.add(mainCard);

        JScrollPane scrollPane = new JScrollPane(wrapper);
        scrollPane.setBorder(null);
        scrollPane.getVerticalScrollBar().setUnitIncrement(16);
        scrollPane.setBackground(BankingGUI.BACKGROUND);

        add(header, BorderLayout.NORTH);
        add(scrollPane, BorderLayout.CENTER);

        // Action Listeners
        backBtn.addActionListener(e -> app.showPanel(BankingGUI.WELCOME_PANEL));

        createBtn.addActionListener(e -> {
            try {
                String pass = new String(passField.getPassword());
                if (!pass.equals(new String(confirmField.getPassword()))) {
                    showError("Passwords don't match!");
                    return;
                }

                if (app.getService().createAccount(nameField.getText().trim(), Integer.parseInt(pass))) {
                    showSuccess("Account created successfully!");
                    app.showPanel(BankingGUI.LOGIN_PANEL);
                }
            } catch(Exception ex) {
                showError("Error creating account. Check your input.");
            }
        });

        confirmField.addActionListener(e -> createBtn.doClick());
    }

    private JLabel createLabel(String text) {
        JLabel label = new JLabel(text);
        label.setFont(new Font("Segoe UI", Font.BOLD, 13));
        label.setForeground(new Color(209, 213, 219));
        return label;
    }

    private JTextField createModernTextField() {
        JTextField field = new JTextField(20);
        field.setFont(new Font("Segoe UI", Font.PLAIN, 14));
        field.setPreferredSize(new Dimension(320, 38));
        field.setBackground(new Color(31, 41, 55));
        field.setForeground(Color.WHITE);
        field.setCaretColor(Color.WHITE);
        field.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createLineBorder(new Color(75, 85, 99), 2),
                BorderFactory.createEmptyBorder(6, 12, 6, 12)
        ));
        return field;
    }

    private JPasswordField createModernPasswordField() {
        JPasswordField field = new JPasswordField(20);
        field.setFont(new Font("Segoe UI", Font.PLAIN, 14));
        field.setPreferredSize(new Dimension(320, 38));
        field.setBackground(new Color(31, 41, 55));
        field.setForeground(Color.WHITE);
        field.setCaretColor(Color.WHITE);
        field.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createLineBorder(new Color(75, 85, 99), 2),
                BorderFactory.createEmptyBorder(6, 12, 6, 12)
        ));
        return field;
    }

    private void showError(String message) {
        JOptionPane.showMessageDialog(this, message, "Error", JOptionPane.ERROR_MESSAGE);
    }

    private void showSuccess(String message) {
        JOptionPane.showMessageDialog(this, message, "Success", JOptionPane.INFORMATION_MESSAGE);
    }
}