/*
  GRANITE DATA SERVICES
  Copyright (C) 2012 GRANITE DATA SERVICES S.A.S.

  This file is part of Granite Data Services.

  Granite Data Services is free software; you can redistribute it and/or modify
  it under the terms of the GNU Library General Public License as published by
  the Free Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  Granite Data Services 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 Library General Public License
  for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

package org.granite.client.tide.validation;

import java.util.HashSet;
import java.util.Set;

import javax.validation.ConstraintViolation;

import org.granite.client.messaging.messages.responses.FaultMessage;
import org.granite.client.messaging.messages.responses.FaultMessage.Code;
import org.granite.client.tide.Context;
import org.granite.client.tide.server.ExceptionHandler;
import org.granite.client.tide.server.TideFaultEvent;
import org.granite.client.validation.InvalidValue;
import org.granite.client.validation.NotifyingValidatorFactory;
import org.granite.client.validation.ServerConstraintViolation;

/**
 * @author William DRAI
 */
public class ValidationExceptionHandler implements ExceptionHandler {

	@Override
	public boolean accepts(FaultMessage emsg) {
		return emsg.getCode().equals(Code.VALIDATION_FAILED);
	}

	@Override
	public void handle(Context context, FaultMessage emsg, TideFaultEvent faultEvent) {
		Object[] invalidValues = emsg.getExtended() != null ? (Object[])emsg.getExtended().get("invalidValues") : null;
		if (invalidValues != null) {
			Set<ConstraintViolation<?>> constraintViolations = new HashSet<ConstraintViolation<?>>();
			
			for (Object v : invalidValues) {
				InvalidValue iv = (InvalidValue)v;
				Object rootBean = context.getEntityManager().getCachedObject(iv.getRootBean(), true);
				Object leafBean = null;
				if (iv.getBean() != null) {
					leafBean = context.getEntityManager().getCachedObject(iv.getBean(), true);
					if (leafBean == null) {
						// Embedded ?
						Object bean = rootBean;
						String[] path = iv.getPath().split("\\.");
						for (int i = 0; i < path.length-1; i++)
							bean = context.getDataManager().getPropertyValue(bean, path[i]);
						leafBean = bean;
					}
				}
				
				ServerConstraintViolation violation = new ServerConstraintViolation(iv, rootBean, leafBean);
				constraintViolations.add(violation);
			}
			
			NotifyingValidatorFactory notifyingValidatorFactory = context.byType(NotifyingValidatorFactory.class);
			if (notifyingValidatorFactory == null)
			    throw new RuntimeException("No suitable validator factory defined, cannot process validation events");
			
		    notifyingValidatorFactory.getValidator().notifyConstraintViolations(null, constraintViolations);
		}
	}

}