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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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package org.apache.james.jmap.utils;

import java.util.Optional;

import javax.inject.Inject;

import org.apache.james.mailbox.MailboxManager;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.mailbox.MessageManager;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.exception.MailboxNotFoundException;
import org.apache.james.mailbox.model.MailboxId;

import com.github.fge.lambdas.Throwing;
import com.google.common.annotations.VisibleForTesting;

public class MailboxUtils {
    private final MailboxManager mailboxManager;

    @Inject
    @VisibleForTesting
    public MailboxUtils(MailboxManager mailboxManager) {
        this.mailboxManager = mailboxManager;
    }

    public boolean hasChildren(MailboxId mailboxId, MailboxSession mailboxSession) throws MailboxException {
        return getMailboxFromId(mailboxId, mailboxSession)
                .map(Throwing.function(MessageManager::getMailboxPath).sneakyThrow())
                .map(Throwing.function(path -> mailboxManager.hasChildren(path, mailboxSession)))
                .orElse(false);
    }

    private Optional<MessageManager> getMailboxFromId(MailboxId mailboxId, MailboxSession mailboxSession) throws MailboxException {
        try {
            return Optional.of(mailboxManager.getMailbox(mailboxId, mailboxSession));
        } catch (MailboxNotFoundException e) {
            return Optional.empty();
        }
    }
}
