/*******************************************************************************
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * 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.
 *
 * Contributors:
 *      Kamesh Sampath - initial implementation
 *      Gregory Amerson - initial implementation review and ongoing maintenance
 *******************************************************************************/

package com.liferay.ide.portlet.core.model.internal;

import com.liferay.ide.core.LiferayCore;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.sapphire.Element;
import org.eclipse.sapphire.PossibleValuesService;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMDocument;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * @author Kamesh Sampath
 * @author Gregory Amerson
 * @author Tao Tao
 */
@SuppressWarnings( "restriction" )
public class PortletNamePossibleValueService extends PossibleValuesService
{

    private static final String PORTLET_NAME_ELEMENT = "portlet-name";
    private String[] localPortletNames;

    /*
     * (non-Javadoc)
     * @see org.eclipse.sapphire.modeling.PossibleValuesService#fillPossibleValues(java.util.SortedSet)
     */
    @Override
    protected void compute( Set<String> values )
    {
        final IFile displayXmlFile = context( Element.class ).resource().adapt( IFile.class );
        final IFolder resourceFolder = (IFolder) displayXmlFile.getParent();

        final IFile portletXml = resourceFolder.getFile( "portlet.xml" );

        IDOMModel portletModel = null;

        try
        {
            portletModel = (IDOMModel) StructuredModelManager.getModelManager().getModelForRead( portletXml );

            IDOMDocument portletDocument = portletModel.getDocument();

            NodeList elements = portletDocument.getElementsByTagName( PORTLET_NAME_ELEMENT );

            List<String> portletNameList = new LinkedList<String>();

            for( int i = 0; i < elements.getLength(); i++ )
            {
                Node portletElement = elements.item( i );

                if( portletElement != null )
                {
                    String portletName = portletElement.getTextContent();
                    portletNameList.add( portletName );
                }
            }

            this.localPortletNames = portletNameList.toArray( new String[0] );
        }
        catch( Exception e )
        {
            LiferayCore.logError( e );
        }
        finally
        {
            if( portletModel != null )
            {
                portletModel.releaseFromRead();
            }
        }

        if( this.localPortletNames != null )
        {
            Collections.addAll( values, this.localPortletNames );
        }
    }

}