/*
    This library 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.
*/

package org.gjt.jclasslib.util;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

/**
    Dialog which displays indeterminate progress.

    @author <a href="mailto:jclasslib@ej-technologies.com">Ingo Kegel</a>
*/
public class ProgressDialog extends JDialog {

    private static final int PROGRESS_BAR_WIDTH = 200;

    private Runnable runnable;

    private JProgressBar progressBar;
    private JLabel lblMessage;

    /**
     * Constructor.
     * @param parent the parent frame.
     * @param runnable the <tt>Runnable</tt> to be started on <tt>setVisible</tt>.
     * @param message the initial status message.
     */
    public ProgressDialog(JFrame parent, Runnable runnable, String message) {
        super(parent);
        init(runnable, message);
    }

    /**
     * Constructor.
     * @param parent the parent dialog.
     * @param runnable the <tt>Runnable</tt> to be started on <tt>setVisible</tt>.
     * @param message the initial status message.
     */
    public ProgressDialog(JDialog parent, Runnable runnable, String message) {
        super(parent);
        init(runnable, message);
    }

    /**
     * Set the current status message.
     * @param message the message.
     */
    public void setMessage(String message) {
        lblMessage.setText(message);
    }

    /**
     * Set the  <tt>Runnable</tt> to be started on <tt>setVisible</tt>.
     * @param runnable the <tt>Runnable</tt>.
     */
    public void setRunnable(Runnable runnable) {
        this.runnable = runnable;
    }

    public void setVisible(boolean visible) {
        if (visible) {
            progressBar.setIndeterminate(true);
            GUIHelper.centerOnParentWindow(this, getOwner());
        } else {
            progressBar.setIndeterminate(false);
        }
        super.setVisible(visible);
    }

    private void init(Runnable runnable, String message) {
        setupControls();
        setupComponent();
        setupEventHandlers();
        setMessage(message);
        setRunnable(runnable);
    }

    private void setupControls() {

        progressBar = new JProgressBar();
        Dimension preferredSize = progressBar.getPreferredSize();
        preferredSize.width = PROGRESS_BAR_WIDTH;
        progressBar.setPreferredSize(preferredSize);
        lblMessage = new JLabel(" ");
    }

    private void setupComponent() {

        JPanel contentPane = (JPanel)getContentPane();
        contentPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new GridBagLayout());
        GridBagConstraints gc = new GridBagConstraints();
        gc.gridx = 0;
        gc.gridy = GridBagConstraints.RELATIVE;
        gc.anchor = GridBagConstraints.NORTHWEST;
        contentPane.add(lblMessage, gc);
        gc.weightx = 1;
        gc.fill = GridBagConstraints.HORIZONTAL;
        contentPane.add(progressBar, gc);

        setTitle(GUIHelper.MESSAGE_TITLE);
        setModal(true);
        pack();

    }

    private void setupEventHandlers() {

        addComponentListener(new ComponentAdapter() {
            public void componentShown(ComponentEvent event) {
                final Thread task = new Thread(runnable);
                task.start();
                new Thread() {
                    public void run() {
                        try {
                            task.join();
                        } catch (InterruptedException e) {
                        }
                        SwingUtilities.invokeLater(new Runnable() {
                            public void run() {
                                setVisible(false);
                            }
                        });
                    }
                }.start();
            }
        });
    }


}
