// Standard imports
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import java.io.File;
import java.io.FileNotFoundException;
import java.net.URL;
import java.net.MalformedURLException;

import javax.media.j3d.GraphicsConfigTemplate3D;

// Application Specific imports
// none

/**
 * A basic frame that does all the setup needed for these demo programs.
 * <p>
 *
 * The window contains a textfield at the top and a Go button to tell it to
 * load the URL described. In the bottom of the frame is a text label for
 * information messages.
 *
 * @author Justin Couch, Alan Hudson
 * @version $Revision: 1.1.1.1 $
 */
public abstract class DemoFrame extends JFrame
    implements ActionListener {

    /** The graphics config template that is best to use */
    protected GraphicsConfiguration gfxConfig;

    /** The textfield to read the values from */
    protected JTextField urlTextField;

    /** The open button on the URl panel */
    private JButton openButton;

    /** The open button on the URl panel */
    private JButton reloadButton;

    /** The label for status messages */
    protected JLabel statusLabel;

    /** The label for FPS messages */
    protected JLabel FPSLabel;

    public DemoFrame(String title) {

        super(title);

        GraphicsConfigTemplate3D template = new GraphicsConfigTemplate3D();
        template.setDoubleBuffer(template.REQUIRED);
        GraphicsEnvironment env =
            GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice dev = env.getDefaultScreenDevice();

        gfxConfig = dev.getBestConfiguration(template);

        urlTextField = new JTextField();
        urlTextField.setText(System.getProperty("user.dir"));
        urlTextField.addActionListener(this);
        urlTextField.requestFocus();

        openButton = new JButton(" Open ");
        openButton.addActionListener(this);

        reloadButton = new JButton(" Reload ");
        reloadButton.addActionListener(this);

        JLabel l1 = new JLabel("  Location: ");

        JPanel p1 = new JPanel(new BorderLayout());
        JPanel p2 = new JPanel(new BorderLayout());
        JPanel p4 = new JPanel(new BorderLayout());
        p1.add(l1, BorderLayout.WEST);
        p1.add(urlTextField, BorderLayout.CENTER);
        p4.add(openButton, BorderLayout.WEST);
        p4.add(reloadButton, BorderLayout.CENTER);
        p2.add(p4, BorderLayout.WEST);
        p2.add(p1, BorderLayout.CENTER);

        Container content_pane = getContentPane();

        content_pane.add(p2, BorderLayout.NORTH);

        statusLabel = new JLabel("Enter a world to load");
        FPSLabel = new JLabel("0");

        JPanel p3 = new JPanel(new BorderLayout());
        p3.add(statusLabel, BorderLayout.WEST);
        p3.add(FPSLabel, BorderLayout.EAST);

        content_pane.add(p3, BorderLayout.SOUTH);

        setSize(1024, 768);

        setLocation(40, 40);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    /**
     * Go to the named URL location. No checking is done other than to make
     * sure it is a valid URL.
     *
     * @param url The URL to open
     */
    public abstract void gotoLocation(URL url);

    /**
     * Load the named file. The file is checked to make sure that it exists
     * before calling this method.
     *
     * @param file The file to load
     */
    public abstract void gotoLocation(File file);

    protected abstract void setWarning(String msg);
    protected abstract void setError(String msg);

    /**
     * An action has been performed. This is the Go button being pressed.
     * Grab the URL and check with the file to see if it exists first as
     * a local file, and then try to make a URL of it. Finally, if this all
     * works, call the abstract gotoLocation method.
     *
     * @param evt The event that caused this method to be called.
     */
    public void actionPerformed(ActionEvent evt) {

        Object src = evt.getSource();

        File fil=null;

        if (src == openButton) {
            FileDialog fd = new FileDialog(this, "Load File");
            fd.setMode(FileDialog.LOAD);
            fd.show();

            fil = new File(fd.getDirectory() + fd.getFile());
            if (fil.exists())
                gotoLocation(fil);
        } else if((src == urlTextField) || (src == reloadButton)) {
            String location = urlTextField.getText();

            fil = new File(location);
            // try a file first
            if(fil.exists()) {
                if(fil.isDirectory())
                    setError("File is a directory");
                else {
                    gotoLocation(fil);
                    statusLabel.setText("World Loaded Successfully");
                }
            } else {
                // Try a URL
                try {
                    URL url = new URL(location);
                    gotoLocation(url);
                    statusLabel.setText("World Loaded Successfully");
                } catch(MalformedURLException mue) {
                    setError("Invalid URL: " + location);
                }
            }
        }
    }
}