/****************************************************************
O * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * 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   *
 * with the License.  You may obtain a copy of the License at   *
 *                                                              *
 *   http://www.apache.org/licenses/LICENSE-2.0                 *
 *                                                              *
 * Unless required by applicable law or agreed to in writing,   *
 * software distributed under the License is distributed on an  *
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
 * KIND, either express or implied.  See the License for the    *
 * specific language governing permissions and limitations      *
 * under the License.                                           *
 ****************************************************************/

package org.apache.james.jmap.draft.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();
        }
    }
}
