/*
 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package com.oracle.graal.visualizer.outline.actions;

import com.oracle.graal.visualizer.outline.OutlineTopComponent;
import com.sun.hotspot.igv.data.GraphDocument;
import com.sun.hotspot.igv.data.serialization.Parser;
import com.sun.hotspot.igv.data.serialization.XMLParser;
import com.sun.hotspot.igv.settings.Settings;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.SwingUtilities;
import javax.swing.filechooser.FileFilter;
import org.netbeans.api.progress.ProgressHandle;
import org.netbeans.api.progress.ProgressHandleFactory;
import org.openide.DialogDisplayer;
import org.openide.NotifyDescriptor;
import org.openide.awt.ActionID;
import org.openide.awt.ActionReference;
import org.openide.awt.ActionReferences;
import org.openide.awt.ActionRegistration;
import org.openide.util.RequestProcessor;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

@ActionID(id = "com.oracle.graal.visualizer.outline.actions.ImportAction", category = "File")
@ActionRegistration(displayName = "Import", iconBase="com/oracle/graal/visualizer/outline/images/import.png")
@ActionReferences(value = {
    @ActionReference(path = "Menu/File", position = 100),
    @ActionReference(path = OutlineTopComponent.GLOBAL_ACTIONS_FOLDER)})
public final class ImportAction implements ActionListener {

    public static FileFilter getFileFilter() {
        return new FileFilter() {

            @Override
            public boolean accept(File f) {
                return f.getName().toLowerCase().endsWith(".xml") || f.isDirectory();
            }

            @Override
            public String getDescription() {
                return "XML files (*.xml)";
            }
        };
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        JFileChooser fc = new JFileChooser();
        fc.setFileFilter(ImportAction.getFileFilter());
        fc.setCurrentDirectory(new File(Settings.get().get(Settings.DIRECTORY, Settings.DIRECTORY_DEFAULT)));

        if (fc.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
            File file = fc.getSelectedFile();

            File dir = file;
            if (!dir.isDirectory()) {
                dir = dir.getParentFile();
            }

            Settings.get().put(Settings.DIRECTORY, dir.getAbsolutePath());

            try {
                final FileInputStream inputStream = new FileInputStream(file);
                final InputSource is = new InputSource(inputStream);

                final ProgressHandle handle = ProgressHandleFactory.createHandle("Opening file " + file.getName());
                final int basis = 1000;
                handle.start(basis);
                final int start = inputStream.available();

                final XMLParser.ParseMonitor parseMonitor = new XMLParser.ParseMonitor() {

                    @Override
                    public void setProgress(double d) {
                        try {
                            int curAvailable = inputStream.available();
                            int prog = (int) (basis * (double) (start - curAvailable) / (double) start);
                            handle.progress(prog);
                        } catch (IOException ex) {
                        }
                    }

                    @Override
                    public void setState(String state) {
                        setProgress(0.0);
                        handle.progress(state);
                    }
                };
                final Parser parser = new Parser();
                final OutlineTopComponent component = OutlineTopComponent.findInstance();

                component.requestActive();

                RequestProcessor.getDefault().post(new Runnable() {

                    @Override
                    public void run() {
                        try {
                            final GraphDocument document = parser.parse(is, parseMonitor);
                            parseMonitor.setState("Finishing");
                            SwingUtilities.invokeLater(new Runnable(){

                                @Override
                                public void run() {
                                    component.getDocument().addGraphDocument(document);
                                }
                            });
                        } catch (SAXException ex) {
                            String s = "Exception during parsing the XML file, could not load document!";
                            if (ex instanceof XMLParser.MissingAttributeException) {
                                XMLParser.MissingAttributeException e = (XMLParser.MissingAttributeException) ex;
                                s += "\nMissing attribute \"" + e.getAttributeName() + "\"";
                            }
                            NotifyDescriptor d = new NotifyDescriptor.Message(s, NotifyDescriptor.ERROR_MESSAGE);
                            DialogDisplayer.getDefault().notify(d);
                        }
                        handle.finish();
                    }
                });

            } catch (IOException ex) {
                DialogDisplayer.getDefault().notify(new NotifyDescriptor.Message("Error reading file!", NotifyDescriptor.ERROR_MESSAGE));
            }
        }
    }
}