content: package tim.prune.function.filesleuth;
  
  import java.awt.BorderLayout;
  import java.awt.Component;
  import java.awt.FlowLayout;
  import java.awt.event.KeyAdapter;
  import java.awt.event.KeyEvent;
  import java.io.File;
  
  import javax.swing.BorderFactory;
  import javax.swing.JButton;
  import javax.swing.JCheckBox;
  import javax.swing.JDialog;
  import javax.swing.JFileChooser;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.JTextField;
  import javax.swing.border.EtchedBorder;
  
  import tim.prune.App;
  import tim.prune.GenericFunction;
  import tim.prune.I18nManager;
  import tim.prune.config.Config;
  
  /**
   * Function to start looking for track files meeting certain criteria.
   * This function just determines the start path and whether to search recursively,
   * before passing control to the FindFilesFunction.
   */
  public class StartFindFilesFunction extends GenericFunction
  {
  	private JDialog _dialog = null;
  	private JTextField _searchDirBox = null;
  	private JCheckBox _subdirsCheckbox = null;
  	private JButton _okButton = null;
  
  	public StartFindFilesFunction(App inApp) {
  		super(inApp);
  	}
  
  	@Override
  	public String getNameKey() {
  		return "menu.file.findfile";
  	}
  
  	@Override
  	public void begin()
  	{
  		if (_dialog == null)
  		{
  			_dialog = new JDialog(_parentFrame, getName());
  			_dialog.setLocationRelativeTo(_parentFrame);
  			_dialog.getContentPane().add(makeContents());
  			_dialog.pack();
  		}
  		// Set directory according to current config
  		final String currPath = getConfig().getConfigString(Config.KEY_TRACK_DIR);
  		_searchDirBox.setText(currPath == null ? "" : currPath);
  		enableButtons();
  		_dialog.setVisible(true);
  	}
  
  	/**
  	 * Enable or disable the OK button
  	 */
  	private void enableButtons()
  	{
  		final String path = _searchDirBox.getText();
  		boolean dirGood = false;
  		if (!path.equals(""))
  		{
  			File dir = new File(path);
  			dirGood = dir.exists() && dir.canRead() && dir.isDirectory();
  		}
  		_okButton.setEnabled(dirGood);
  	}
  
  	/**
  	 * @return the contents of the window as a Component
  	 */
  	private Component makeContents()
  	{
  		JPanel dialogPanel = new JPanel();
  		dialogPanel.setBorder(BorderFactory.createCompoundBorder(
  			BorderFactory.createEtchedBorder(EtchedBorder.LOWERED), BorderFactory.createEmptyBorder(4, 4, 4, 4))
  		);
  		dialogPanel.setLayout(new BorderLayout(0, 5));
  		// dir panel
  		JPanel dirPanel = new JPanel();
  		dirPanel.setLayout(new BorderLayout());
  		dirPanel.add(new JLabel(I18nManager.getText("dialog.findfile.dir") + " : "), BorderLayout.WEST);
  		_searchDirBox = new JTextField(24);
  		_searchDirBox.addKeyListener(new KeyAdapter() {
  			public void keyReleased(KeyEvent arg0) {
  				super.keyReleased(arg0);
  				enableButtons();
  			}
  		});
  		_searchDirBox.addActionListener(e -> finish());
  		dirPanel.add(_searchDirBox, BorderLayout.CENTER);
  		JButton browseButton = new JButton(I18nManager.getText("button.browse"));
  		browseButton.addActionListener(e -> chooseDir());
  		dirPanel.add(browseButton, BorderLayout.EAST);
  		_subdirsCheckbox = new JCheckBox(I18nManager.getText("dialog.open.includesubdirectories"), true);
  		dirPanel.add(_subdirsCheckbox, BorderLayout.SOUTH);
  		// holder panel so it doesn't expand vertically
  		JPanel dirHolderPanel = new JPanel();
  		dirHolderPanel.setLayout(new BorderLayout());
  		dirHolderPanel.add(dirPanel, BorderLayout.NORTH);
  		dialogPanel.add(dirHolderPanel, BorderLayout.CENTER);
  
  		// OK, Cancel buttons at the bottom right
  		JPanel buttonPanelr = new JPanel();
  		buttonPanelr.setLayout(new FlowLayout(FlowLayout.RIGHT));
  		_okButton = new JButton(I18nManager.getText("button.ok"));
  		_okButton.addActionListener(e -> finish());
  		buttonPanelr.add(_okButton);
  		JButton cancelButton = new JButton(I18nManager.getText("button.cancel"));
  		cancelButton.addActionListener(e -> _dialog.dispose());
  		buttonPanelr.add(cancelButton);
  
  		// Put them together
  		JPanel buttonPanel = new JPanel();
  		buttonPanel.setLayout(new BorderLayout());
  		buttonPanel.add(buttonPanelr, BorderLayout.EAST);
  		dialogPanel.add(buttonPanel, BorderLayout.SOUTH);
  		return dialogPanel;
  	}
  
  	/**
  	 * Function activated by the "Browse..." button to select a directory
  	 */
  	private void chooseDir()
  	{
  		JFileChooser chooser = new JFileChooser();
  		chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
  		// Set start path from currently selected dir
  		String path = _searchDirBox.getText();
  		if (path.length() > 1) {
  			chooser.setCurrentDirectory(new File(path));
  		}
  		if (chooser.showOpenDialog(_parentFrame) == JFileChooser.APPROVE_OPTION) {
  			_searchDirBox.setText(chooser.getSelectedFile().getAbsolutePath());
  		}
  		enableButtons();
  	}
  
  	/**
  	 * OK pressed, start the search
  	 */
  	private void finish()
  	{
  		if (!_okButton.isEnabled()) {
  			return;
  		}
  		File startDir = new File(_searchDirBox.getText());
  		if (hasAnyFiles(startDir, _subdirsCheckbox.isSelected()))
  		{
  			new FindFilesFunction(_app, startDir, _subdirsCheckbox.isSelected()).begin();
  			_dialog.dispose();
  		}
  		else {
  			_app.showErrorMessage(getNameKey(), "error.findfile.nofilesfound");
  		}
  	}
  
  	/**
  	 * Check if the given path has any files to search through
  	 */
  	private boolean hasAnyFiles(File inPath, boolean inSubdirs)
  	{
  		if (inPath == null || !inPath.exists() || !inPath.canRead() || !inPath.isDirectory()) {
  			return false;
  		}
  		File[] files = inPath.listFiles();
  		if (files == null) {
  			return false;
  		}
  		// Look through files in this directory
  		for (File file : files)
  		{
  			if (file != null && file.isFile() && file.canRead()) {
  				return true;
  			}
  		}
  		if (inSubdirs)
  		{
  			// Also look in subdirectories
  			for (File dir : files)
  			{
  				if (dir != null && dir.isDirectory() && dir.canRead() && hasAnyFiles(dir, true)) {
  					return true;
  				}
  			}
  		}
  		// Nothing found
  		return false;
  	}
  }
  