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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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 * software distributed under the License is distributed on an  *
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package org.apache.james.mailbox.jpa.mail;

import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceException;

import org.apache.james.backends.jpa.EntityManagerUtils;
import org.apache.james.mailbox.ModSeq;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.jpa.JPAId;
import org.apache.james.mailbox.jpa.mail.model.JPAMailbox;
import org.apache.james.mailbox.model.Mailbox;
import org.apache.james.mailbox.model.MailboxId;
import org.apache.james.mailbox.store.mail.ModSeqProvider;

public class JPAModSeqProvider implements ModSeqProvider {

    private final EntityManagerFactory factory;

    @Inject
    public JPAModSeqProvider(EntityManagerFactory factory) {
        this.factory = factory;
    }

    @Override
    public ModSeq highestModSeq(Mailbox mailbox) throws MailboxException {
        JPAId mailboxId = (JPAId) mailbox.getMailboxId();
        return highestModSeq(mailboxId);
    }

    @Override
    public ModSeq nextModSeq(Mailbox mailbox) throws MailboxException {
        return nextModSeq((JPAId) mailbox.getMailboxId());
    }

    @Override
    public ModSeq nextModSeq(MailboxId mailboxId) throws MailboxException {
        return nextModSeq((JPAId) mailboxId);
    }

    @Override
    public ModSeq highestModSeq(MailboxId mailboxId) throws MailboxException {
        return highestModSeq((JPAId) mailboxId);
    }

    private ModSeq nextModSeq(JPAId mailboxId) throws MailboxException {
        EntityManager manager = null;
        try {
            manager = factory.createEntityManager();
            manager.getTransaction().begin();
            JPAMailbox m = manager.find(JPAMailbox.class, mailboxId.getRawId());
            long modSeq = m.consumeModSeq();
            manager.persist(m);
            manager.getTransaction().commit();
            return ModSeq.of(modSeq);
        } catch (PersistenceException e) {
            if (manager != null && manager.getTransaction().isActive()) {
                manager.getTransaction().rollback();
            }
            throw new MailboxException("Unable to save highest mod-sequence for mailbox " + mailboxId.serialize(), e);
        } finally {
            EntityManagerUtils.safelyClose(manager);
        }
    }

    private ModSeq highestModSeq(JPAId mailboxId) throws MailboxException {
        EntityManager manager = factory.createEntityManager();
        try {
            return highestModSeq(mailboxId, manager);
        } finally {
            EntityManagerUtils.safelyClose(manager);
        }
    }

    public ModSeq highestModSeq(MailboxId mailboxId, EntityManager manager) throws MailboxException {
        JPAId jpaId = (JPAId) mailboxId;
        try {
            long highest = (Long) manager.createNamedQuery("findHighestModSeq")
                .setParameter("idParam", jpaId.getRawId())
                .getSingleResult();
            return ModSeq.of(highest);
        } catch (PersistenceException e) {
            throw new MailboxException("Unable to get highest mod-sequence for mailbox " + mailboxId.serialize(), e);
        }
    }
}