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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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 * software distributed under the License is distributed on an  *
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package org.apache.james.mailbox.jcr.mail;

import java.util.Optional;
import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Session;

import org.apache.james.mailbox.MailboxPathLocker;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.mailbox.MessageUid;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.jcr.MailboxSessionJCRRepository;
import org.apache.james.mailbox.jcr.mail.model.JCRMailbox;
import org.apache.james.mailbox.store.mail.AbstractLockingUidProvider;
import org.apache.james.mailbox.store.mail.model.Mailbox;

public class JCRUidProvider extends AbstractLockingUidProvider {

    private final MailboxSessionJCRRepository repository;

    public JCRUidProvider(MailboxPathLocker locker, MailboxSessionJCRRepository repository) {
        super(locker);
        this.repository = repository;
    }

    @Override
    public Optional lastUid(MailboxSession mailboxSession, Mailbox mailbox) throws MailboxException {
        try {
            Session s = repository.login(mailboxSession);
            Node node = s.getNodeByIdentifier(mailbox.getMailboxId().serialize());
            long rawUid = node.getProperty(JCRMailbox.LASTUID_PROPERTY).getLong();
            if (rawUid == 0) {
                return Optional.empty();
            }
            return Optional.of(MessageUid.of(rawUid));
        } catch (RepositoryException e) {
            throw new MailboxException("Unable to get last uid for mailbox " + mailbox, e);
        }
        
    }

    @Override
    protected MessageUid lockedNextUid(MailboxSession session, Mailbox mailbox) throws MailboxException {
        try {
            Session s = repository.login(session);
            Node node = s.getNodeByIdentifier(mailbox.getMailboxId().serialize());
            MessageUid uid = MessageUid.of(node.getProperty(JCRMailbox.LASTUID_PROPERTY).getLong());
            MessageUid nextUid = uid.next();
            node.setProperty(JCRMailbox.LASTUID_PROPERTY, nextUid.asLong());
            s.save();
            return nextUid;
        } catch (RepositoryException e) {
            throw new MailboxException("Unable to consume next uid for mailbox " + mailbox, e);
        }
    }
    


}