/* BasicExceptionDialog.java
   Copyright (C) 2011 Red Hat, Inc.

This file is part of IcedTea.

IcedTea 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, version 2.

IcedTea is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
IcedTea; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is making a
combined work based on this library. Thus, the terms and conditions of the GNU
General Public License cover the whole combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules, and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms and
conditions of the license of that module. An independent module is a module
which is not derived from or based on this library. If you modify this library,
you may extend this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this exception
statement from your version. */

package net.adoptopenjdk.icedteaweb.client;

import net.adoptopenjdk.icedteaweb.IcedTeaWebConstants;
import net.adoptopenjdk.icedteaweb.OutputUtils;
import net.adoptopenjdk.icedteaweb.client.console.JavaConsole;
import net.adoptopenjdk.icedteaweb.client.controlpanel.CachePane;
import net.adoptopenjdk.icedteaweb.logging.Logger;
import net.adoptopenjdk.icedteaweb.logging.LoggerFactory;
import net.adoptopenjdk.icedteaweb.ui.swing.ScreenFinder;
import net.adoptopenjdk.icedteaweb.ui.swing.SwingUtils;
import net.sourceforge.jnlp.util.ImageResources;

import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;

import static net.adoptopenjdk.icedteaweb.i18n.Translator.R;

/**
 * A dialog that displays some basic information about an exception
 */
public class BasicExceptionDialog {

    private final static Logger LOG = LoggerFactory.getLogger(BasicExceptionDialog.class);

    private static final AtomicInteger dialogInstances = new AtomicInteger();

    /**
     * Must be invoked from the Swing EDT.
     *
     * @param exception the exception to indicate
     */
    public static void show(final Exception exception) {
        Objects.requireNonNull(exception);
        final String detailsText = OutputUtils.exceptionToString(exception);

        final JPanel mainPanel = new JPanel(new BorderLayout());
        mainPanel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));

        final JOptionPane optionPane = new JOptionPane(mainPanel, JOptionPane.ERROR_MESSAGE);
        final JDialog errorDialog = optionPane.createDialog(R("Error"));
        errorDialog.setAlwaysOnTop(true);
        errorDialog.setName("BasicExceptionDialog");
        SwingUtils.info(errorDialog);
        errorDialog.setIconImages(ImageResources.INSTANCE.getApplicationImages());

        final JPanel quickInfoPanelAll = new JPanel();
        final JPanel quickInfoPanelMessage = new JPanel();
        final JPanel quickInfoPanelButtons = new JPanel();
        final BoxLayout layoutAll = new BoxLayout(quickInfoPanelAll, BoxLayout.Y_AXIS);
        final BoxLayout layoutMessage = new BoxLayout(quickInfoPanelMessage, BoxLayout.X_AXIS);
        final BoxLayout layoutButtons = new BoxLayout(quickInfoPanelButtons, BoxLayout.X_AXIS);
        quickInfoPanelAll.setLayout(layoutAll);
        quickInfoPanelMessage.setLayout(layoutMessage);
        quickInfoPanelMessage.setBorder(BorderFactory.createEmptyBorder(0, 0, 15, 0));
        quickInfoPanelButtons.setLayout(layoutButtons);
        mainPanel.add(quickInfoPanelAll, BorderLayout.PAGE_START);
        quickInfoPanelAll.add(quickInfoPanelMessage);
        quickInfoPanelAll.add(quickInfoPanelButtons);

        final JLabel errorLabel = new JLabel(exception.getMessage());
        errorLabel.setAlignmentY(JComponent.LEFT_ALIGNMENT);
        quickInfoPanelMessage.add(errorLabel);

        final JButton viewDetails = new JButton(R("ButShowDetails"));
        viewDetails.setAlignmentY(JComponent.LEFT_ALIGNMENT);
        viewDetails.setActionCommand("show");
        quickInfoPanelButtons.add(viewDetails);

        final JButton cacheButton = getClearCacheButton(errorDialog);
        cacheButton.setAlignmentY(JComponent.LEFT_ALIGNMENT);
        quickInfoPanelButtons.add(cacheButton);

        final JButton consoleButton = getShowButton(errorDialog);
        consoleButton.setAlignmentY(JComponent.LEFT_ALIGNMENT);
        quickInfoPanelButtons.add(consoleButton);

        final JPanel fillRest = new JPanel();
        fillRest.setAlignmentY(JComponent.LEFT_ALIGNMENT);
        quickInfoPanelButtons.add(fillRest);

        final JTextArea textArea = new JTextArea();
        textArea.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        textArea.setEditable(false);
        textArea.setText(detailsText);
        final JScrollPane scrollPane = new JScrollPane(textArea);
        scrollPane.setPreferredSize(new Dimension(100, 200));

        viewDetails.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(final ActionEvent e) {
                if (viewDetails.getActionCommand().equals("show")) {
                    mainPanel.add(scrollPane, BorderLayout.CENTER);
                    viewDetails.setActionCommand("hide");
                    viewDetails.setText(R("ButHideDetails"));
                    errorDialog.pack();
                } else {
                    mainPanel.remove(scrollPane);
                    viewDetails.setActionCommand("show");
                    viewDetails.setText(R("ButShowDetails"));
                    errorDialog.pack();
                }
            }
        });

        errorDialog.pack();
        errorDialog.setResizable(true);
        ScreenFinder.centerWindowsToCurrentScreen(errorDialog);
        errorDialog.setVisible(true);
        errorDialog.dispose();
        BasicExceptionDialog.willBeHidden();
    }

     public static JButton getShowButton(final Component parent) {
         final JButton consoleButton = new JButton();
        consoleButton.setText(R("DPJavaConsole"));
        consoleButton.addActionListener(new java.awt.event.ActionListener() {

            @Override
            public void actionPerformed(final java.awt.event.ActionEvent evt) {
                try {
                    JavaConsole.getConsole().showConsoleLater(true);
                } catch (Exception ex) {
                    LOG.error(IcedTeaWebConstants.DEFAULT_ERROR_MESSAGE, ex);
                    JOptionPane.showConfirmDialog(parent, ex);
                }
            }
        });
        if (!JavaConsole.isEnabled()) {
            consoleButton.setEnabled(false);
            consoleButton.setToolTipText(R("DPJavaConsoleDisabledHint"));
        }
        return consoleButton;
    }

    public static JButton getClearCacheButton(final Component parent) {
        final JButton clearAllButton = new JButton();
        clearAllButton.setText(R("CVCPCleanCache"));
        clearAllButton.setToolTipText(R("CVCPCleanCacheTip"));
        clearAllButton.addActionListener(new java.awt.event.ActionListener() {

            @Override
            public void actionPerformed(final java.awt.event.ActionEvent evt) {
                SwingUtils.invokeLater(new Runnable() {

                    @Override
                    public void run() {
                        try {
                            CachePane.visualCleanCache(parent);
                        } catch (Exception ex) {
                            LOG.error(IcedTeaWebConstants.DEFAULT_ERROR_MESSAGE, ex);
                        }
                    }
                });
            }
        });
        return clearAllButton;
    }

    private synchronized static int willBeHidden() {
        return dialogInstances.decrementAndGet();
    }

    //must be called out of EDT, otherwise -- will happen before ++
    public synchronized static int  willBeShown() {
        return dialogInstances.incrementAndGet();
    }
    
    public synchronized static boolean areShown() {
        return dialogInstances.intValue() > 0;
    }
}
