/*
 * This file is part of LibrePlan
 *
 * Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
 *                         Desenvolvemento Tecnolóxico de Galicia
 * Copyright (C) 2010-2011 Igalia, S.L.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.libreplan.business.common.daos;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.Validate;
import org.hibernate.NonUniqueResultException;
import org.hibernate.criterion.Restrictions;
import org.libreplan.business.common.entities.EntityNameEnum;
import org.libreplan.business.common.entities.EntitySequence;
import org.libreplan.business.common.exceptions.InstanceNotFoundException;
import org.libreplan.business.i18n.I18nHelper;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.Scope;
import org.springframework.orm.hibernate5.HibernateOptimisticLockingFailureException;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 * DAO for {@link EntitySequence}.
 *
 * @author Susana Montes Pedreira <smontes@wirelessgalicia.com>
 */
@Repository
@Scope(BeanDefinition.SCOPE_SINGLETON)
public class EntitySequenceDAO extends GenericDAOHibernate<EntitySequence, Long> implements IEntitySequenceDAO {

    @Override
    public List<EntitySequence> getAll() {
        return list(EntitySequence.class);
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<EntitySequence> findEntitySequencesNotIn(List<EntitySequence> entitySequences) {
        List<Long> entitySequenceIds = new ArrayList<>();
        for (EntitySequence entitySequence : entitySequences) {
            if ( !entitySequence.isNewObject() ) {
                entitySequenceIds.add(entitySequence.getId());
            }
        }

        return getSession()
                .createCriteria(EntitySequence.class)
                .add(Restrictions.not(Restrictions.in("id", entitySequenceIds)))
                .list();
    }

    @Override
    public void remove(final EntitySequence entitySequence) throws InstanceNotFoundException, IllegalArgumentException {
        if ( entitySequence.getLastValue() > 0 ) {
            throw new IllegalArgumentException(
                    I18nHelper._("Entity Sequence cannot be deleted. Entity Sequence already in use"));
        }

        remove(entitySequence.getId());
    }

    @Override
    public EntitySequence getActiveEntitySequence(EntityNameEnum entityName)
            throws InstanceNotFoundException, NonUniqueResultException {

        EntitySequence entitySequence = (EntitySequence) getSession()
                .createCriteria(EntitySequence.class)
                .add(Restrictions.eq("entityName", entityName))
                .add(Restrictions.eq("active", true))
                .uniqueResult();

        if ( entitySequence == null ) {
            throw new InstanceNotFoundException(entitySequence, "Entity sequence not exist");
        }

        return entitySequence;
    }

    @Override
    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public String getNextEntityCode(EntityNameEnum entityName) {
        return getNextEntityCodeWithoutTransaction(entityName);
    }

    public String getNextEntityCodeWithoutTransaction(EntityNameEnum entityName) {
        for (int i = 0; i < 5; i++) {
            try {
                String code;
                EntitySequence entitySequence = getActiveEntitySequence(entityName);

                do {
                    entitySequence.incrementLastValue();
                    code = entitySequence.getCode();
                } while (entityName.getIntegrationEntityDAO().existsByCode(code));

                save(entitySequence);
                return code;

            } catch (HibernateOptimisticLockingFailureException | InstanceNotFoundException | NonUniqueResultException e) {
                // Do nothing (optimistic approach 5 attempts)
            }
        }

        return null;
    }

    @Override
    public boolean existOtherActiveSequenceByEntityNameForNewObject(EntitySequence entitySequence) {
        Validate.notNull(entitySequence);
        try {
            EntitySequence t = getActiveEntitySequence(entitySequence.getEntityName());
            return (t != null && t != entitySequence);

        } catch (InstanceNotFoundException e) {
            return false;
        } catch (NonUniqueResultException e) {
            return true;
        }
    }

    @Override
    public Integer getNumberOfDigitsCode(EntityNameEnum entityName) {
        int numberOfDigits;
        try {
            EntitySequence entitySequence = getActiveEntitySequence(entityName);
            numberOfDigits = entitySequence.getNumberOfDigits();
        } catch (InstanceNotFoundException | NonUniqueResultException e) {
            throw new RuntimeException(e);
        }

        return numberOfDigits;
    }
}