/*******************************************************************************
 * 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.
 *
 *******************************************************************************/
package com.liferay.ide.project.core.model.internal;

import com.liferay.ide.project.core.model.SDKProjectImportOp;
import com.liferay.ide.project.core.util.ProjectImportUtil;
import com.liferay.ide.project.core.util.ProjectUtil;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.sapphire.DerivedValueService;
import org.eclipse.sapphire.FilteredListener;
import org.eclipse.sapphire.PropertyContentEvent;


/**
 * @author Simon Jiang
 */
public class SDKProjectImportPluginTypeDerivedValueService extends DerivedValueService
{
    private FilteredListener<PropertyContentEvent> listener;

    @Override
    protected void initDerivedValueService()
    {
        super.initDerivedValueService();

        this.listener = new FilteredListener<PropertyContentEvent>()
        {
            @Override
            protected void handleTypedEvent( PropertyContentEvent event )
            {
                refresh();
            }
        };

        op().property( SDKProjectImportOp.PROP_LOCATION ).attach( this.listener );
    }

    @Override
    protected String compute()
    {
        String retVal = null;

        if ( op().getLocation() != null )
        {
            if ( op().getLocation().content() != null && !op().getLocation().content().isEmpty() )
            {
                IStatus status = ProjectImportUtil.validateSDKProjectPath( op().getLocation().content().toPortableString() );

                if ( status.isOK() )
                {
                    retVal = ProjectUtil.getLiferayPluginType( op().getLocation().content().toPortableString() );
                }
            }
        }
        return retVal;
    }

    private SDKProjectImportOp op()
    {
        return context( SDKProjectImportOp.class );
    }

    @Override
    public void dispose()
    {
        if ( op() != null)
        {
            op().property( SDKProjectImportOp.PROP_LOCATION ).detach( this.listener );
        }
        super.dispose();
    }
}