import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.beans.*;

public class WOR_FilePreviewFrame extends JInternalFrame
	implements ActionListener, PropertyChangeListener {

	JFileChooser chooser;
	JTextArea textArea;
	JLabel commentArea;
	String fileName = null;
	String selectedFile = null;
	protected static final int LINES = 20;
	protected static final int COLUMNS = 40;
	static int openFrameCount = 0;
	static final int offset = 10;

	private String if_wor = "not-null";

	public WOR_FilePreviewFrame() {
		super("", true, true, true, true);
		setTitle("File Previewer");
		String dir = "./wor";

		File dirFile = dir == null ? null : new File(dir);
		chooser = new JFileChooser(dirFile);
		chooser.setMultiSelectionEnabled(false);

		// Create a text area to preview the file
		textArea = new JTextArea(LINES, COLUMNS);
		textArea.setEditable(false);
		textArea.setFont(new Font("Dialog", Font.BOLD, 10));

		JPanel controlPanel = new JPanel();
		controlPanel.setLayout(new BorderLayout());
		controlPanel.add(chooser, "Center");
		JPanel commentPanel = new JPanel();
		commentPanel.setLayout(new BorderLayout());
		commentArea = new JLabel("Select a file...", SwingConstants.LEFT);
		commentPanel.add(new JSeparator(), "North");
		commentPanel.add(commentArea, "South");
		controlPanel.add(commentPanel, "South");

		JPanel textPanel = new JPanel();
		textPanel.setLayout(new BorderLayout());
		textPanel.add(new JScrollPane(textArea), "Center");
		textPanel.setBorder(BorderFactory.createTitledBorder(
			BorderFactory.createEtchedBorder(),
			"Preview", TitledBorder.CENTER,
			TitledBorder.TOP));

		setContentPane(controlPanel);
		pack();
		setLocation( offset * openFrameCount, offset * openFrameCount);

		// Install the text previewer as the JFileChooser accessory
		chooser.setAccessory(textPanel);

		// Register to receive file selection events from the chooser
		chooser.addActionListener(this);

		// Register to receive property changes from the chooser
		chooser.addPropertyChangeListener(this);

		//return f;
	}

	// Get the name of the selected file, or null if none selected
	public String getFileName() {
		System.out.println( "Filename 3: " + fileName + "selectedFile: " + selectedFile );
		return fileName;
	}

	// Handle file selected event from the JFileChooser
	public void actionPerformed(ActionEvent evt) {
		File selectedFile = chooser.getSelectedFile();

		System.out.println( "selectedFile 4: " + selectedFile );

		if (selectedFile == null) {
			return;
		}
		else {

			fileName = selectedFile.getPath();

			System.out.println( "Filename 4: " + fileName );
			//return selectedFile;
		}

		//JInternalFrame doc = new FormFrame16( fileName );
		//setContentPane(doc);

		// Dispose the dialog
		//setVisible(false);
		//return fileName;
	}

	// Handle property changes from the JFileChooser
	public void propertyChange(PropertyChangeEvent evt) {
		if (evt.getPropertyName().equals(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)) {
			File selectedFile = (File)evt.getNewValue();

			// Single click on something
			if (selectedFile.isFile() && selectedFile.canRead()) {
				// It's a file: show the preview
				previewFile(selectedFile);
				commentArea.setText("Double-click to select this file.");
			} else {
				// Clear text area if not a readable file
				textArea.setText("");
				if (selectedFile.isFile() == false) {
					commentArea.setText("Not a file.");
				} else {
					commentArea.setText("File is not readable.");
				}
			}
		}
	}

	protected void previewFile(File f) {
		textArea.setText("");
		try {
			BufferedReader br = new BufferedReader(new FileReader(f));
			for (int i = 0; i < LINES; i++) {
				String s = br.readLine();
				if (s == null) {
					break;
				}
			textArea.append(s);
			textArea.append("\n");
		}
		br.close();
		} catch (Throwable t) {
			textArea.setText("");
			commentArea.setText("Failed to read file contents.");
		}
	}
}