package com.nilhcem.fakesmtp.gui;

 import com.nilhcem.fakesmtp.core.ArgsHandler;

 import com.nilhcem.fakesmtp.core.I18n;

 import com.nilhcem.fakesmtp.gui.info.ClearAllButton;

 import com.nilhcem.fakesmtp.gui.info.NbReceivedLabel;

 import com.nilhcem.fakesmtp.gui.info.PortTextField;

 import com.nilhcem.fakesmtp.gui.info.SaveMsgField;

 import com.nilhcem.fakesmtp.gui.info.StartServerButton;

 import com.nilhcem.fakesmtp.gui.tab.LastMailPane;

 import com.nilhcem.fakesmtp.gui.tab.LogsPane;

 import com.nilhcem.fakesmtp.gui.tab.MailsListPane;

 import com.nilhcem.fakesmtp.server.MailSaver;

 import com.nilhcem.fakesmtp.server.SMTPServerHandler;

 import net.miginfocom.swing.MigLayout;

 import javax.swing.JLabel;

 import javax.swing.JPanel;

 import javax.swing.JTabbedPane;

 import java.util.Observable;

 /**

  * Provides the main panel of the application, which will contain all the components.

  *

  * @author Nilhcem

  * @since 1.0

  */

 public final class MainPanel {

         // I18n

         private final I18n i18n = I18n.INSTANCE;

         // Panel and layout

         private final MigLayout layout = new MigLayout(

                 "", // Layout constraints

                 "[] 10 [] [] [grow,fill]", // Column constraints

                 "[] [] 5 [] 5 [grow,fill] []"); // Row constraints

         private final JPanel mainPanel = new JPanel(layout);

         // Directory chooser

         private final DirChooser dirChooser = new DirChooser(mainPanel);

         // Port

         private final JLabel portLabel = new JLabel(i18n.get("mainpanel.listening.port"));

         private final PortTextField portText = new PortTextField();

         private final StartServerButton startServerBtn = new StartServerButton();

         // Messages received

         private final JLabel receivedLabel = new JLabel(i18n.get("mainpanel.messages.received"));

         private final NbReceivedLabel nbReceivedLabel = new NbReceivedLabel();

         // Save incoming messages to

         private final JLabel saveMessages = new JLabel(i18n.get("mainpanel.save.messages"));

         private final SaveMsgField saveMsgTextField = new SaveMsgField();

         // Tab pane

         private final JTabbedPane tabbedPane = new JTabbedPane();

         private final LogsPane logsPane = new LogsPane();

         private final MailsListPane mailsListPane = new MailsListPane();

         private final LastMailPane lastMailPane = new LastMailPane();

         // Clear all

         private final ClearAllButton clearAll = new ClearAllButton();

         /**

          * Creates the main panel.

          * <p>

          * To create the main panel, the method will first have to handle components interactions by

          * adding observers to observable elements, then the method will build the GUI by placing all the

          * components in the main panel.

          * </p>

          *

          * @param menu the menu bar which will notify the directory file chooser.

          */

         public MainPanel(Observable menu) {

                 assignLabelsToFields();

                 addObservers(menu);

                 buildGUI();

                 checkArgs();

         }

         /**

          * Returns the JPanel object.

          *

          * @return the JPanel object.

          */

         public JPanel get() {

                 return mainPanel;

         }

         /**

          * Handles components interactions by adding observers to observable elements.

          * <p>

          * The interactions are the following:

          * <ul>

          *   <li>Open the directory chooser when clicking on the menu/the save message field;</li>

          *   <li>Enable/Disable the port field when the server starts;</li>

          *   <li>Set the new directory, once a folder is selected;<li>

          *   <li>Notify components when a message is received;</li>

          *   <li>Notify components when the user wants to clear them all.</li>

          * </ul>

          * </p>

          *

          * @param menu the menu bar which will notify the directory file chooser.

          */

         private void addObservers(Observable menu) {

                 // When we want to select a directory

                 menu.addObserver(dirChooser);

                 saveMsgTextField.addObserver(dirChooser);

                 // When we click on "start server" button

                 startServerBtn.addObserver(portText);

                 // When we press "Enter" on the PortTextField

                 portText.addObserver(startServerBtn);

                 // Once we chose a directory

                 dirChooser.addObserver(saveMsgTextField);

                 // When a message is received

                 MailSaver mailSaver = SMTPServerHandler.INSTANCE.getMailSaver();

                 mailSaver.addObserver(nbReceivedLabel);

                 mailSaver.addObserver(mailsListPane);

                 mailSaver.addObserver(lastMailPane);

                 mailSaver.addObserver(clearAll);

                 // When we click on "clear all"

                 clearAll.addObserver(nbReceivedLabel);

                 clearAll.addObserver(mailsListPane);

                 clearAll.addObserver(logsPane);

                 clearAll.addObserver(lastMailPane);

         }

         /**

          * Places all components in the panel.

          */

         private void buildGUI() {

                 // Port / Start server

                 mainPanel.add(portLabel);

                 mainPanel.add(portText.get(), "w 60!");

                 mainPanel.add(startServerBtn.get(), "span, w 165!");

                 // Save messages to...

                 mainPanel.add(saveMessages);

                 mainPanel.add(saveMsgTextField.get(), "span, w 230!");

                 // Nb received

                 mainPanel.add(receivedLabel);

                 mainPanel.add(nbReceivedLabel.get(), "span");

                 // Tab pane

                 tabbedPane.add(mailsListPane.get(), i18n.get("mainpanel.tab.mailslist"));

                 tabbedPane.add(logsPane.get(), i18n.get("mainpanel.tab.smtplog"));

                 tabbedPane.add(lastMailPane.get(), i18n.get("mainpanel.tab.lastmessage"));

                 mainPanel.add(tabbedPane, "span, grow");

                 // Clear all

                 mainPanel.add(clearAll.get(), "span, center");

         }

         /**

          * Checks command line arguments and toggles components if necessary.

          * <p>

          * <ul><li>if the user has chosen a different port, then specifies it in the port text field.</li>

          * <li>if the user has chosen to auto-start the SMTP server, then it toggles automatically the "start server" button.</li></ul>

          * </p>

          */

         private void checkArgs() {

                 ArgsHandler args = ArgsHandler.INSTANCE;

                 if (args.getPort() != null) {

                         portText.setText(args.getPort());

                 }

                 if (args.shouldStartServerAtLaunch()) {

                         startServerBtn.toggleButton();

                 }

                 if (args.memoryModeEnabled()) {

                         saveMsgTextField.get().setEnabled(false);

                 }

         }

         /**

          * Assigns labels to components, for accessibility purpose.

          */

         private void assignLabelsToFields() {

                 portLabel.setLabelFor(portText.get());

                 saveMessages.setLabelFor(saveMsgTextField.get());

                 receivedLabel.setLabelFor(nbReceivedLabel.get());

         }

         /**

          * Returns reference to portText field. Used for saving last values to file

          *

          * @return reference to portText field. Used for saving last values to file

          */

         public PortTextField getPortText() {

                 return portText;

         }

         /**

          * Returns reference to saveMsgTextField. Used for saving last values to file

      *

      * @return reference to saveMsgTextField. Used for saving last values to file

          */

         public SaveMsgField getSaveMsgTextField() {

                 return saveMsgTextField;

         }

 }