package com.nilhcem.fakesmtp.gui.tab;

 import com.nilhcem.fakesmtp.core.ArgsHandler;

 import com.nilhcem.fakesmtp.core.Configuration;

 import com.nilhcem.fakesmtp.core.I18n;

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

 import com.nilhcem.fakesmtp.model.EmailModel;

 import com.nilhcem.fakesmtp.model.UIModel;

 import com.nilhcem.fakesmtp.server.MailSaver;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import javax.mail.internet.MimeUtility;

 import javax.swing.JOptionPane;

 import javax.swing.JScrollPane;

 import javax.swing.JTable;

 import javax.swing.table.DefaultTableModel;

 import java.awt.Desktop;

 import java.awt.Rectangle;

 import java.awt.event.ComponentAdapter;

 import java.awt.event.ComponentEvent;

 import java.awt.event.MouseEvent;

 import java.awt.event.MouseListener;

 import java.io.File;

 import java.io.IOException;

 import java.io.UnsupportedEncodingException;

 import java.text.SimpleDateFormat;

 import java.util.Observable;

 import java.util.Observer;

 /**

  * Scrolled table where will be displayed every received email (one line for each email).

  * <p>

  * The user can double-click on any row to see the selected email.

  * </p>

  *

  * @author Nilhcem

  * @since 1.0

  */

 public final class MailsListPane implements Observer {

         private int nbElements = 0;

         private Desktop desktop = null;

         private static final Logger LOGGER = LoggerFactory.getLogger(MailsListPane.class);

         private final I18n i18n = I18n.INSTANCE;

         private final JScrollPane mailsListPane = new JScrollPane();

         private final SimpleDateFormat dateFormat = new SimpleDateFormat("hh:mm:ss a");

         private final int[] widths = new int[] {85, 140, 140}; // widths of columns in tab

         /**

          * Table with non-editable cells.

          */

         private final JTable table = new JTable() {

                 private static final long serialVersionUID = 6332956458868628779L;

                 @Override

                 public boolean isCellEditable(int row, int column) {

                         return false;

                 }

         };

         /**

          * Table model with non-editable cells.

          */

         private final DefaultTableModel model = new DefaultTableModel() {

                 private static final long serialVersionUID = -6716294637919469299L;

                 public boolean isCellEditable(int rowIndex, int mColIndex) {

                         return false;

                 }

         };

         /**

          * Creates the table and sets its cells as non editable.

          * <p>

          * Adds some mouse events on the table, to display emails, when a user clicks on

          * a specific row.<br>

          * If the email can't be found, an error message will be displayed.<br>

          * The table will reset the size of its column every time the size of the table changed

          * (for example when the user maximizes the window).

          * </p>

          */

         public MailsListPane() {

                 // Init desktop (Java 6 Desktop API)

                 if (Desktop.isDesktopSupported()) {

                         desktop = Desktop.getDesktop();

                 }

                 if (!ArgsHandler.INSTANCE.memoryModeEnabled()) {

                         table.addMouseListener(new MouseListener() {

                                 @Override

                                 public void mouseReleased(MouseEvent e) {

                                 }

                                 @Override

                                 public void mousePressed(MouseEvent e) {

                                 }

                                 @Override

                                 public void mouseExited(MouseEvent e) {

                                 }

                                 @Override

                                 public void mouseEntered(MouseEvent e) {

                                 }

                                 @Override

                                 public void mouseClicked(MouseEvent e) {

                                         String emlViewer = ArgsHandler.INSTANCE.getEmlViewer();

                                         if (e.getClickCount() == 2 && (emlViewer != null || desktop != null)) {

                                                 File file = null;

                                                 JTable target = (JTable) e.getSource();

                                                 String fileName = UIModel.INSTANCE.getListMailsMap().get(target.getSelectedRow());

                                                 if (fileName == null) {

                                                         LOGGER.error("Can't find any associated email for row #{}", target.getSelectedRow());

                                                 } else {

                                                         file = new File(fileName);

                                                 }

                                                 if (file != null && file.exists()) {

                                                         try {

                                                                 if (emlViewer != null) {

                                                                         Runtime.getRuntime().exec(emlViewer + " " + file.getAbsolutePath());

                                                                 } else {

                                                                         desktop.open(file);

                                                                 }

                                                         } catch (IOException ioe) {

                                                                 LOGGER.error("", ioe);

                                                                 displayError(String.format(i18n.get("mailslist.err.open"), file.getAbsolutePath()));

                                                         }

                                                 } else {

                                                         displayError(String.format(i18n.get("mailslist.err.find"), file.getAbsolutePath()));

                                                 }

                                         }

                                 }

                         });

         }

                 // Auto scroll tab to bottom when a new element is inserted

                 table.addComponentListener(new ComponentAdapter() {

                         public void componentResized(ComponentEvent e) {

                                 table.scrollRectToVisible(new Rectangle(table.getCellRect(nbElements, 0, true)));

                         }

                 });

                 model.addColumn(i18n.get("mailslist.col.received"));

                 model.addColumn(i18n.get("mailslist.col.from"));

                 model.addColumn(i18n.get("mailslist.col.to"));

                 model.addColumn(i18n.get("mailslist.col.subject"));

                 table.setModel(model);

                 mailsListPane.addComponentListener(new ComponentAdapter() {

                         public void componentResized(ComponentEvent e) {

                                 // When the width of a column is changed, only the columns to the left and right of the margin change

                                 table.setAutoResizeMode(JTable.AUTO_RESIZE_NEXT_COLUMN);

                                 // Set width for each column

                                 int total = 0;

                                 int length = widths.length;

                                 for (int i = 0; i < length; i++) {

                                         table.getColumnModel().getColumn(i).setPreferredWidth(widths[i]);

                                         total += widths[i];

                                 }

                                 table.getColumnModel().getColumn(length).setPreferredWidth(table.getWidth() - total);

                         }

                 });

                 mailsListPane.getViewport().add(table, null);

         }

         /**

          * Returns the JScrollPane object.

          *

          * @return the JScrollPane object.

          */

         public JScrollPane get() {

                 return mailsListPane;

         }

         /**

          * Updates the content of the table.

          * <p>

          * This method will be called by an observable element.

      * </p>

          * <ul>

          *   <li>If the observable is a {@link MailSaver} object, a new row will be added

          *   to the table, and the {@link UIModel} will be updated;</li>

          *   <li>If the observable is a {@link ClearAllButton} object, all the cells

          *   of the table will be removed, and the {@link UIModel} will be updated.</li>

          * </ul>

          *

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

          * @param arg optional parameters (an {@code EmailModel} object, for the case of

          * a {@code MailSaver} observable) containing all the information about the email.

          */

         @Override

         public void update(Observable o, Object arg) {

                 if (o instanceof MailSaver) {

                         EmailModel email = (EmailModel) arg;

                         String subject;

                         try {

                                 subject = MimeUtility.decodeText(email.getSubject());

                         } catch (UnsupportedEncodingException e) {

                                 LOGGER.error("", e);

                                 subject = email.getSubject();

                         }

                         model.addRow(new Object[] {dateFormat.format(email.getReceivedDate()), email.getFrom(), email.getTo(), subject});

                         UIModel.INSTANCE.getListMailsMap().put(nbElements++, email.getFilePath());

                 } else if (o instanceof ClearAllButton) {

                         // Delete information from the map

                         UIModel.INSTANCE.getListMailsMap().clear();

                         // Remove elements from the list

                         try {

                                 while (nbElements > 0) {

                                         model.removeRow(--nbElements);

                                 }

                         } catch (ArrayIndexOutOfBoundsException e) {

                                 LOGGER.error("", e);

                         }

                 }

         }

         /**

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

          *

          * @param error a String representing an error message to display.

          */

         private void displayError(String error) {

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

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

                         JOptionPane.ERROR_MESSAGE);

         }

 }