package com.nilhcem.fakesmtp.gui.info;

 import com.nilhcem.fakesmtp.core.Configuration;

 import com.nilhcem.fakesmtp.core.I18n;

 import com.nilhcem.fakesmtp.model.UIModel;

 import javax.swing.JTextField;

 import javax.swing.event.DocumentEvent;

 import javax.swing.event.DocumentListener;

 import java.awt.event.ActionEvent;

 import java.awt.event.ActionListener;

 import java.util.Observable;

 import java.util.Observer;

 /**

  * Text field in which will be written the desired SMTP port.

  *

  * @author Nilhcem

  * @since 1.0

  */

 public final class PortTextField extends Observable implements Observer {

         private final JTextField portTextField = new JTextField();

         /**

          * Creates the port field object and adds a listener on change to alert the presentation model.

          * <p>

          * The default port's value is defined in the configuration.properties file.<br>

          * Each time the port is modified, the port from the {@link UIModel} will be reset.

          * </p>

          */

         public PortTextField() {

                 portTextField.setToolTipText(I18n.INSTANCE.get("porttextfield.tooltip"));

                 portTextField.getDocument().addDocumentListener(new DocumentListener() {

                         @Override

                         public void removeUpdate(DocumentEvent e) {

                                 warn();

                         }

                         @Override

                         public void insertUpdate(DocumentEvent e) {

                                 warn();

                         }

                         @Override

                         public void changedUpdate(DocumentEvent e) {

                                 warn();

                         }

                         private void warn() {

                                 UIModel.INSTANCE.setPort(portTextField.getText());

                         }

                 });

                 portTextField.setText(Configuration.INSTANCE.get("smtp.default.port"));

                 portTextField.addActionListener(new ActionListener() {

                         @Override

                         public void actionPerformed(ActionEvent e) {

                                 setChanged();

                                 notifyObservers();

                         }

                 });

         }

         /**

          * Returns the JTextField object.

          *

          * @return the JTextField object.

          */

         public JTextField get() {

                 return portTextField;

         }

         /**

          * Sets the specified port in the text field only if this latter is not {@code null}.

          *

          * @param portStr the port to set.

          */

         public void setText(String portStr) {

                 if (portStr != null && !portStr.isEmpty()) {

                         portTextField.setText(portStr);

                 }

         }

         /**

          * Enables or disables the port text field.

          * <p>

          * When the element will receive an action from the {@link StartServerButton} object,

          * it will enable or disable the port, so that the user can't modify it

          * when the server is already launched.

          * </p>

          *

          * @param o the observable element which will notify this class.

          * @param arg optional parameters (not used).

          */

         @Override

         public void update(Observable o, Object arg) {

                 if (o instanceof StartServerButton) {

                         portTextField.setEnabled(!UIModel.INSTANCE.isStarted());

                 }

         }

 }