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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   *
 * with the License.  You may obtain a copy of the License at   *
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 * software distributed under the License is distributed on an  *
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 * KIND, either express or implied.  See the License for the    *
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package org.apache.james.imap.encode;

import java.io.IOException;
import java.util.List;
import java.util.Optional;

import org.apache.james.imap.api.ImapConstants;
import org.apache.james.imap.message.response.MetadataResponse;
import org.apache.james.mailbox.model.MailboxAnnotation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MetadataResponseEncoder implements ImapResponseEncoder {
    private static final Logger LOGGER = LoggerFactory.getLogger(MetadataResponseEncoder.class);

    @Override
    public Class acceptableMessages() {
        return MetadataResponse.class;
    }

    @Override
    public void encode(MetadataResponse response, ImapResponseComposer composer) throws IOException {
        composer.untagged();
        composer.message(ImapConstants.ANNOTATION_RESPONSE_NAME);

        composer.mailbox(Optional.ofNullable(response.getMailboxName()).orElse(""));
        composeAnnotations(composer, response.getMailboxAnnotations());

        composer.end();
    }

    private void composeAnnotations(ImapResponseComposer composer, List annotations) throws IOException {
        if (!annotations.isEmpty()) {
            composer.openParen();
            for (MailboxAnnotation annotation : annotations) {
                composeAnnotation(composer, annotation);
            }
            composer.closeParen();
        }
    }

    private void composeAnnotation(ImapResponseComposer composer, MailboxAnnotation annotation) throws IOException {
        if (annotation.isNil()) {
            LOGGER.warn("There is nil data of key {} on store: ", annotation.getKey().asString());
        } else {
            composer.message(annotation.getKey().asString());
            composer.quote(annotation.getValue().orElse(""));
        }
    }
}