/*
 * Moonlight|3D Copyright (C) 2005 The Moonlight|3D team
 * 
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library 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 Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * Created on Jan 14, 2005
 */

package ml.ui.core;

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.util.ArrayList;
import java.util.List;

import com.trolltech.qt.core.Qt;
import com.trolltech.qt.gui.QDialog;
import com.trolltech.qt.gui.QHBoxLayout;
import com.trolltech.qt.gui.QLabel;
import com.trolltech.qt.gui.QListWidget;
import com.trolltech.qt.gui.QPushButton;
import com.trolltech.qt.gui.QTabWidget;
import com.trolltech.qt.gui.QVBoxLayout;
import com.trolltech.qt.gui.QWidget;

/**
 * Displays a simple modal About dialog for Moonlight|3D.
 * 
 * @author gregor
 */
public class AboutDialog extends QDialog {
    QTabWidget tab;
    QWidget programPage;
    QPushButton okButton;
    QLabel label;
    QWidget pluginsPage;
    QListWidget pluginList;
    QWidget memoryPage;
    QLabel memoryLabel;
    
    private static ArrayList<AboutDialogPageFactory> pageFactories;
    
    static {
    	pageFactories=new ArrayList<AboutDialogPageFactory>();
    }
    
    public static void registerAboutDialogPageFactory(AboutDialogPageFactory pageFactory) {
    	pageFactories.add(pageFactory);
    }

    public static void unregisterAboutDialogPageFactory(AboutDialogPageFactory pageFactory) {
    	pageFactories.remove(pageFactory);
    }

    /**
     * @param parentShell The parent for this (modal) dialog
     */
    public AboutDialog(QWidget parent)
    {
        super(parent);
        setWindowTitle("About Moonlight|3D");
        
        tab=new QTabWidget(parent);
        okButton=new QPushButton(this);
        okButton.setText("OK");
        okButton.clicked.connect(this,"close()");

        QVBoxLayout tabLayout=new QVBoxLayout(this);
        tabLayout.addWidget(tab,1);
        tabLayout.addWidget(okButton);
        
        setLayout(tabLayout);
        
        programPage=new QWidget(tab);
        tab.addTab(programPage, "Program");
        createProgramPage(programPage);

        pluginsPage=new QWidget(tab);
        tab.addTab(pluginsPage, "Plugins");
        createPluginsPage(pluginsPage);
        
        memoryPage=new QWidget(tab);
        tab.addTab(memoryPage,"Memory usage");
        createMemoryPage(memoryPage);
        
        for(AboutDialogPageFactory pageFactory : pageFactories) {
        	QWidget page=new QWidget(tab);
        	tab.addTab(page, pageFactory.getName());
        	pageFactory.generateAboutDialogPage(page);
        }
    }
    
    public void createProgramPage(QWidget parent)
    {
        label=new QLabel(parent);
        label.setText("Moonlight|3D " + ml.core.State.Version.asString() + "\n(C) 2003-2007 The Moonlight Team\n\nGregor Mueckl\nPeter Brinkler");
    	QVBoxLayout layout=new QVBoxLayout(parent);
    	layout.addWidget(label,1,Qt.AlignmentFlag.AlignCenter);
        parent.setLayout(layout);
    }
    
    public void createPluginsPage(QWidget parent)
    {
        pluginList=new QListWidget(parent);

        List<String> pluginList=ml.core.State.getInstance().getPluginManager().getPluginList();
        for(int i=0;i<pluginList.size();i++) {
            this.pluginList.addItem(pluginList.get(i));
        }        
    	QHBoxLayout layout=new QHBoxLayout(parent);
    	layout.addWidget(this.pluginList,1);
        parent.setLayout(layout);
    }

    public void createMemoryPage(QWidget parent)
    {
        MemoryMXBean memoryBean=ManagementFactory.getMemoryMXBean();
        MemoryUsage heapUsage=memoryBean.getHeapMemoryUsage();
        
        memoryLabel=new QLabel(parent);
        memoryLabel.setText("max. heap memory: " + heapUsage.getMax() + "\ncommited heap memory: " + heapUsage.getCommitted() + "\nused heap memory: " + heapUsage.getUsed());
    	QVBoxLayout layout=new QVBoxLayout(parent);
    	layout.addWidget(memoryLabel,1,Qt.AlignmentFlag.AlignCenter);
        parent.setLayout(layout);
    }
}