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package org.apache.james.mailbox.jcr.mail;

import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Session;

import org.apache.commons.lang3.NotImplementedException;
import org.apache.james.mailbox.MailboxPathLocker;
import org.apache.james.mailbox.MailboxSession;
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.model.MailboxId;
import org.apache.james.mailbox.store.mail.AbstractLockingModSeqProvider;
import org.apache.james.mailbox.store.mail.model.Mailbox;

public class JCRModSeqProvider extends AbstractLockingModSeqProvider {

    private final MailboxSessionJCRRepository repository;

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

    @Override
    public long highestModSeq(MailboxSession session, Mailbox mailbox) throws MailboxException {
        try {
            Session s = repository.login(session);
            Node node = s.getNodeByIdentifier(mailbox.getMailboxId().serialize());
            return node.getProperty(JCRMailbox.HIGHESTMODSEQ_PROPERTY).getLong();
        } catch (RepositoryException e) {
            throw new MailboxException("Unable to get highest mod-sequence for mailbox " + mailbox, e);
        } 
    }

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

    @Override
    public long highestModSeq(MailboxSession session, MailboxId mailboxId) throws MailboxException {
        throw new NotImplementedException("Not implemented");
    }

}