/*******************************************************************************
 * 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.portlet.core.lfportlet.model.internal;

import com.liferay.ide.core.LiferayCore;
import com.liferay.ide.portlet.core.lfportlet.model.PortletStyleElement;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceProxy;
import org.eclipse.core.resources.IResourceProxyVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.sapphire.Element;
import org.eclipse.sapphire.ValueProperty;
import org.eclipse.sapphire.modeling.Path;
import org.eclipse.sapphire.modeling.Status;
import org.eclipse.sapphire.services.ValidationService;

/**
 * @author Simon Jiang
 */
public class PortletStyleValidationService extends ValidationService
{

    @Override
    protected Status compute()
    {
        final Element modelElement = context( Element.class );

        if( !modelElement.disposed() && modelElement instanceof PortletStyleElement )
        {
            final Path path = (Path) modelElement.property( context( ValueProperty.class ) ).content();

            if( path != null )
            {
                final String name = path.lastSegment();
                final IProject project = modelElement.adapt( IProject.class );
                boolean fileExisted = new FileCheckVisitor().checkFiles( project, name );

                if( !fileExisted )
                {
                    return Status.createErrorStatus( "File " + path.toPortableString() + " is not existed" );
                }
            }
            else
            {
                return Status.createErrorStatus( "Can not set empty value" );
            }
        }

        return Status.createOkStatus();
    }

    private static class FileCheckVisitor implements IResourceProxyVisitor
    {
        String searchFileName = null;
        boolean fileExisted = false;

        public boolean visit( IResourceProxy resourceProxy )
        {
            if( resourceProxy.getType() == IResource.FILE && resourceProxy.getName().equals( searchFileName ) )
            {
                IResource resource = resourceProxy.requestResource();

                if( resource.exists() )
                {
                    fileExisted = true;
                }
            }

            return true;
        }

        public boolean checkFiles( IResource container, String searchFileName )
        {
            this.searchFileName = searchFileName;

            try
            {
                container.accept( this, IContainer.EXCLUDE_DERIVED );
            }
            catch( CoreException e )
            {
                LiferayCore.logError( e );
            }

            return fileExisted;
        }
    }

}