import java.awt.Component;
import java.awt.Container;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SpringLayout;


public class LoginForm extends JPanel {
        private static final String LOGIN_COMMAND = "Log in";
        private JLabel labUserName;
        private JTextField tfUserName;
        private JLabel labPassword;
        private JPasswordField tfPassword;
        private JButton bnLogin;

        public LoginForm(AbstractAction loginAction) {
                SpringLayout layout = new SpringLayout();
                setLayout(layout);

                labUserName = new JLabel("User name");
                tfUserName = new JTextField(15);
                labPassword = new JLabel("Password");
                tfPassword = new JPasswordField(15);

                bnLogin = new JButton(loginAction);
                bnLogin.setDefaultCapable(true);

                String command = (String) loginAction.getValue(Action.ACTION_COMMAND_KEY);

                if ((command == null) || (command = command.trim()).equals("")) {
                        command = LOGIN_COMMAND;
                }

                bnLogin.setText(command);

                add(labUserName);
                add(tfUserName);
                add(labPassword);
                add(tfPassword);
                add(bnLogin);

                layout.putConstraint(SpringLayout.WEST, labUserName, 10,
                        SpringLayout.WEST, this);
                layout.putConstraint(SpringLayout.NORTH, labUserName, 25,
                        SpringLayout.NORTH, this);
                layout.putConstraint(SpringLayout.NORTH, tfUserName, 25,
                        SpringLayout.NORTH, this);
                layout.putConstraint(SpringLayout.WEST, tfUserName, 20,
                        SpringLayout.EAST, labUserName);

                layout.putConstraint(SpringLayout.WEST, labPassword, 10,
                        SpringLayout.WEST, this);
                layout.putConstraint(SpringLayout.NORTH, labPassword, 50,
                        SpringLayout.NORTH, this);
                layout.putConstraint(SpringLayout.NORTH, tfPassword, 50,
                        SpringLayout.NORTH, this);
                layout.putConstraint(SpringLayout.WEST, tfPassword, 20,
                        SpringLayout.EAST, labUserName);

                layout.putConstraint(SpringLayout.NORTH, bnLogin, 75,
                        SpringLayout.NORTH, this);
                layout.putConstraint(SpringLayout.WEST, bnLogin, 0, SpringLayout.WEST,
                        labUserName);
                // Set constraints for Container itself
                layout.putConstraint(SpringLayout.SOUTH, this, 20, SpringLayout.SOUTH,
                        bnLogin);
                layout.putConstraint(SpringLayout.EAST, this, 5, SpringLayout.EAST,
                        tfPassword);
        }

        /**
         * Get the contents of the user name field
         *
         * @return The value of the user name field
         */
        public String getUserName() {
                return tfUserName.getText();
        }

        /**
         * Get the password from the password field
         *
         * @return The password as char[]
         */
        public char[] getPassword() {
                return tfPassword.getPassword();
        }
}