package com.nilhcem.fakesmtp.gui.info;

 import java.awt.event.ActionEvent;

 import java.awt.event.ActionListener;

 import java.util.Observable;

 import java.util.Observer;

 import javax.swing.JButton;

 import javax.swing.JOptionPane;

 import com.nilhcem.fakesmtp.core.Configuration;

 import com.nilhcem.fakesmtp.core.I18n;

 import com.nilhcem.fakesmtp.core.exception.BindPortException;

 import com.nilhcem.fakesmtp.core.exception.InvalidPortException;

 import com.nilhcem.fakesmtp.core.exception.OutOfRangePortException;

 import com.nilhcem.fakesmtp.model.UIModel;

 /**

  * Button to start the SMTP server.

  *

  * @author Nilhcem

  * @since 1.0

  */

 public final class StartServerButton extends Observable implements Observer {

         private final I18n i18n = I18n.INSTANCE;

         private final JButton button = new JButton(i18n.get("startsrv.start"));

         /**

          * Creates a start button to start the SMTP server.

          * <p>

          * If the user selects a wrong port before starting the server, the method will display an error message.

          * </p>

          */

         public StartServerButton() {

                 button.addActionListener(new ActionListener() {

                         @Override

                         public void actionPerformed(ActionEvent e) {

                                 toggleButton();

                         }

                 });

         }

         /**

          * Switches the text inside the button and calls the PortTextField observer to enable/disable the port field.

          *

          * @see PortTextField

          */

         public void toggleButton() {

                 try {

                         UIModel.INSTANCE.toggleButton();

                 } catch (InvalidPortException ipe) {

                         displayError(String.format(i18n.get("startsrv.err.invalid")));

                 } catch (BindPortException bpe) {

                         displayError(String.format(i18n.get("startsrv.err.bound"), bpe.getPort()));

                 } catch (OutOfRangePortException orpe) {

                         displayError(String.format(i18n.get("startsrv.err.range"), orpe.getPort()));

                 } catch (RuntimeException re) {

                         displayError(String.format(i18n.get("startsrv.err.default"), re.getMessage()));

                 }

                 if (UIModel.INSTANCE.isStarted()) {

                         button.setText(i18n.get("startsrv.started"));

                         button.setEnabled(false);

                 }

                 setChanged();

                 notifyObservers();

         }

         /**

          * Returns the JButton object.

          *

          * @return the JButton object.

          */

         public JButton get() {

                 return button;

         }

         /**

          * Displays a message dialog displaying the error specified in parameter.

          *

          * @param error a string representing the error which will be displayed in a message dialog.

          */

         private void displayError(String error) {

                 JOptionPane.showMessageDialog(button.getParent(), error,

                         String.format(i18n.get("startsrv.err.title"), Configuration.INSTANCE.get("application.name")),

                         JOptionPane.ERROR_MESSAGE);

         }

         @Override

         public void update(Observable o, Object arg) {

                 if (o instanceof PortTextField) {

                         toggleButton();

                 }

         }

 }