/*
 * Copyright (c) 2008, 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.sun.hotspot.igv.controlflow;

import com.sun.hotspot.igv.data.InputGraph;
import com.sun.hotspot.igv.data.services.InputGraphProvider;
import java.awt.BorderLayout;
import java.io.Serializable;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import org.openide.ErrorManager;
import org.openide.util.Lookup;
import org.openide.util.LookupEvent;
import org.openide.util.LookupListener;
import org.openide.util.NbBundle;
import org.openide.util.Utilities;
import org.openide.windows.TopComponent;
import org.openide.windows.WindowManager;

/**
 *
 * @author Thomas Wuerthinger
 */
final class ControlFlowTopComponent extends TopComponent implements LookupListener {

    private static ControlFlowTopComponent instance;
    private Lookup.Result result = null;
    private static final String PREFERRED_ID = "ControlFlowTopComponent";
    private ControlFlowScene scene;

    private ControlFlowTopComponent() {
        initComponents();
        setName(NbBundle.getMessage(ControlFlowTopComponent.class, "CTL_ControlFlowTopComponent"));
        setToolTipText(NbBundle.getMessage(ControlFlowTopComponent.class, "HINT_ControlFlowTopComponent"));

        scene = new ControlFlowScene();
        this.setLayout(new BorderLayout());
        this.associateLookup(scene.getLookup());


        JScrollPane panel = new JScrollPane(scene.createView());
        this.add(panel, BorderLayout.CENTER);
    }

    @Override
    public void requestFocus() {
        super.requestFocus();
        scene.getView().requestFocus();
    }

    @Override
    public boolean requestFocusInWindow() {
        super.requestFocusInWindow();
        return scene.getView().requestFocusInWindow();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:initComponents
    private void initComponents() {

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );
    }// </editor-fold>//GEN-END:initComponents
    // Variables declaration - do not modify//GEN-BEGIN:variables
    // End of variables declaration//GEN-END:variables
    /**
     * Gets default instance. Do not use directly: reserved for *.settings files only,
     * i.e. deserialization routines; otherwise you could get a non-deserialized instance.
     * To obtain the singleton instance, use {@link findInstance}.
     */
    public static synchronized ControlFlowTopComponent getDefault() {
        if (instance == null) {
            instance = new ControlFlowTopComponent();
        }
        return instance;
    }

    /**
     * Obtain the ControlFlowTopComponent instance. Never call {@link #getDefault} directly!
     */
    public static synchronized ControlFlowTopComponent findInstance() {
        TopComponent win = WindowManager.getDefault().findTopComponent(PREFERRED_ID);
        if (win == null) {
            ErrorManager.getDefault().log(ErrorManager.WARNING, "Cannot find ControlFlow component. It will not be located properly in the window system.");
            return getDefault();
        }
        if (win instanceof ControlFlowTopComponent) {
            return (ControlFlowTopComponent) win;
        }
        ErrorManager.getDefault().log(ErrorManager.WARNING, "There seem to be multiple components with the '" + PREFERRED_ID + "' ID. That is a potential source of errors and unexpected behavior.");
        return getDefault();
    }

    @Override
    public int getPersistenceType() {
        return TopComponent.PERSISTENCE_ALWAYS;
    }

    @Override
    public void componentOpened() {
        Lookup.Template tpl = new Lookup.Template(Object.class);
        result = Utilities.actionsGlobalContext().lookup(tpl);
        result.addLookupListener(this);
    }

    @Override
    public void componentClosed() {
        result.removeLookupListener(this);
        result = null;
    }

    public void resultChanged(LookupEvent lookupEvent) {

        final InputGraphProvider p = Lookup.getDefault().lookup(InputGraphProvider.class);
        if (p != null) {
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
            InputGraph g = p.getGraph();
            if (g != null) {
                scene.setGraph(g);
            }
        }
            });
        }
    }

    @Override
    public Object writeReplace() {
        return new ResolvableHelper();
    }

    @Override
    protected String preferredID() {
        return PREFERRED_ID;
    }

    @Override
    public void requestActive() {
        scene.getView().requestFocusInWindow();
        super.requestActive();
    }

    final static class ResolvableHelper implements Serializable {

        private static final long serialVersionUID = 1L;

        public Object readResolve() {
            return ControlFlowTopComponent.getDefault();
        }
    }
}