package com.nilhcem.fakesmtp.gui;

 import java.awt.Component;

 import java.io.File;

 import java.util.Observable;

 import java.util.Observer;

 import javax.swing.JFileChooser;

 import com.nilhcem.fakesmtp.core.Configuration;

 import com.nilhcem.fakesmtp.core.I18n;

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

 import com.nilhcem.fakesmtp.model.UIModel;

 /**

  * Provides a graphical directory chooser dialog.

  * <p>

  * The directory chooser is used to select the folder where emails will be saved in.<br>

  * It can be launched from the menu bar, or from the main panel.

  * </p>

  *

  * @author Nilhcem

  * @since 1.0

  */

 public final class DirChooser extends Observable implements Observer {

         private final JFileChooser dirChooser = new JFileChooser();

         private Component parent = null;

         /**

          * Creates a {@code JFileChooser} component and sets it to be for directories only.

          *

          * @param parent the component from where the chooser will be launched <i>(should be the main panel of the application)</i>.

          */

         public DirChooser(Component parent) {

                 this.parent = parent;

                 dirChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

                 dirChooser.setDialogTitle(String.format(I18n.INSTANCE.get("dirchooser.title"),

                         Configuration.INSTANCE.get("application.name")));

                 dirChooser.setApproveButtonText(I18n.INSTANCE.get("dirchooser.approve.btn"));

         }

         /**

          * Opens the folder selection.

          * <p>

          * This method will be called by an {@code Observable} element:

      * </p>

          * <ul>

          *   <li>The {@link MenuBar};</li>

          *   <li>Or the {@link SaveMsgField}.</li>

          * </ul>

          *

          * @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 MenuBar || o instanceof SaveMsgField) {

                         openFolderSelection();

                 }

         }

         /**

          * Opens the folder selection dialog and notify observers once the directory is selected.

          * <p>

          * The only observer notified is the {@link SaveMsgField}.

          * </p>

          */

         private void openFolderSelection() {

                 File filePath = new File(Configuration.INSTANCE.get("emails.default.dir"));

                 dirChooser.setCurrentDirectory(filePath);

                 int result = dirChooser.showOpenDialog(parent);

                 if (result == JFileChooser.APPROVE_OPTION) {

                         File selectedDir = dirChooser.getSelectedFile();

                         if (selectedDir != null) {

                                 UIModel.INSTANCE.setSavePath(selectedDir.getAbsolutePath());

                                 setChanged();

                                 notifyObservers();

                         }

                 }

         }

 }