/*
    * DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
    * Copyright (C) 2009  Mickael Guessant
    *
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU General Public License
    * as published by the Free Software Foundation; either version 2
    * of the License, or (at your option) any later version.
    *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   */
  package davmail.ui;
  
  import davmail.BundleMessage;
  import davmail.DavGateway;
  import davmail.ui.browser.DesktopBrowser;
  import davmail.ui.tray.DavGatewayTray;
  
  import javax.imageio.ImageIO;
  import javax.swing.*;
  import javax.swing.event.HyperlinkEvent;
  import javax.swing.text.html.HTMLEditorKit;
  import javax.swing.text.html.StyleSheet;
  import java.awt.*;
  import java.awt.event.ActionListener;
  import java.io.IOException;
  import java.net.URISyntaxException;
  import java.net.URL;
  
  /**
   * About frame
   */
  public class AboutFrame extends JFrame {
      private final JEditorPane jEditorPane;
  
      /**
       * About frame.
       */
      public AboutFrame() {
          setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
          setTitle(BundleMessage.format("UI_ABOUT_DAVMAIL"));
          try {
              setIconImages(DavGatewayTray.getFrameIcons());
          } catch (NoSuchMethodError error) {
              DavGatewayTray.debug(new BundleMessage("LOG_UNABLE_TO_SET_ICON_IMAGE"));
          }
          try {
              JLabel imageLabel = new JLabel();
              ClassLoader classloader = this.getClass().getClassLoader();
              URL imageUrl = classloader.getResource("tray32.png");
              if (imageUrl != null) {
                  Image iconImage = ImageIO.read(imageUrl);
                  ImageIcon icon = new ImageIcon(iconImage);
                  imageLabel.setIcon(icon);
  
                  JPanel imagePanel = new JPanel();
                  imagePanel.add(imageLabel);
                  add(BorderLayout.WEST, imagePanel);
              }
          } catch (IOException e) {
              DavGatewayTray.error(new BundleMessage("LOG_UNABLE_TO_CREATE_ICON"), e);
          }
  
          jEditorPane = new JEditorPane();
          HTMLEditorKit htmlEditorKit = new HTMLEditorKit();
          StyleSheet stylesheet = htmlEditorKit.getStyleSheet();
          Font font = jEditorPane.getFont();
          stylesheet.addRule("body { font-size:small;font-family: " + ((font == null) ? "Arial" : font.getFamily()) + '}');
          jEditorPane.setEditorKit(htmlEditorKit);
          jEditorPane.setContentType("text/html");
          jEditorPane.setText(getContent(null));
  
          jEditorPane.setEditable(false);
          jEditorPane.setOpaque(false);
          jEditorPane.addHyperlinkListener(hle -> {
              if (HyperlinkEvent.EventType.ACTIVATED.equals(hle.getEventType())) {
                  try {
                      DesktopBrowser.browse(hle.getURL().toURI());
                  } catch (URISyntaxException e) {
                      DavGatewayTray.error(new BundleMessage("LOG_UNABLE_TO_OPEN_LINK"), e);
                  }
                  setVisible(false);
              }
          });
  
  
          JPanel mainPanel = new JPanel();
          mainPanel.add(jEditorPane);
          add(BorderLayout.CENTER, mainPanel);
  
          JPanel buttonPanel = new JPanel();
          JButton ok = new JButton(BundleMessage.format("UI_BUTTON_OK"));
         ActionListener close = evt -> setVisible(false);
         ok.addActionListener(close);
 
         buttonPanel.add(ok);
 
         add(BorderLayout.SOUTH, buttonPanel);
 
         pack();
         setResizable(false);
         // center frame
         setLocation(getToolkit().getScreenSize().width / 2 -
                         getSize().width / 2,
                 getToolkit().getScreenSize().height / 2 -
                         getSize().height / 2);
     }
 
     String getContent(String releasedVersion) {
         Package davmailPackage = DavGateway.class.getPackage();
         StringBuilder buffer = new StringBuilder();
         buffer.append(BundleMessage.format("UI_ABOUT_DAVMAIL_AUTHOR"));
         String currentVersion = davmailPackage.getImplementationVersion();
         if (currentVersion != null) {
             buffer.append(BundleMessage.format("UI_CURRENT_VERSION", currentVersion));
         }
         if ((currentVersion != null && releasedVersion != null && currentVersion.compareTo(releasedVersion) != 0)
                 || (currentVersion == null && releasedVersion != null)) {
             buffer.append(BundleMessage.format("UI_LATEST_VERSION", releasedVersion));
         }
         buffer.append(BundleMessage.format("UI_HELP_INSTRUCTIONS"));
         return buffer.toString();
     }
 
 
     /**
      * Update about frame content with current released version.
      */
     public void update() {
         jEditorPane.setText(getContent(DavGateway.getReleasedVersion()));
         pack();
     }
 
 }