/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
 * contributors by the @authors tag. See the copyright.txt in the
 * distribution for a full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package baeldung.service;

import baeldung.data.MemberRepository;
import baeldung.data.SecondaryPersistenceUnit;
import baeldung.model.Member;
import baeldung.model.QMember;

import javax.ejb.Stateless;
import javax.enterprise.event.Event;
import javax.enterprise.inject.Default;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.ValidationException;
import javax.validation.Validator;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;

@Stateless
public class MemberRegistration {

    @Inject
    private Logger log;

    @Inject
    private MemberRepository repository;

    @Inject
    private Event<Member> memberEventSrc;

    @Inject
    private Validator validator;

    private void validateMember(Member member) throws ConstraintViolationException, ValidationException {
        // Create a bean validator and check for issues.
        Set<ConstraintViolation<Member>> violations = validator.validate(member);

        if (!violations.isEmpty()) {
            throw new ConstraintViolationException(new HashSet<ConstraintViolation<?>>(violations));
        }

        // Check the uniqueness of the email address
        if (emailAlreadyExists(member.getEmail())) {
            throw new ValidationException("Unique Email Violation");
        }
    }

    public void register(Member member) throws Exception {
        log.info("Registering " + member.getName());
        validateMember(member);
        repository.save(member);
        memberEventSrc.fire(member);
    }

    public boolean emailAlreadyExists(String email) {
        Member member = null;
        try {
            member = repository.findByEmail(email);
        } catch (NoResultException e) {
            // ignore
        }
        return member != null;
    }

}