/**
 * Copyright (c) 2013, Redsolution LTD. All rights reserved.
 *
 * This file is part of Xabber project; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License, Version 3.
 *
 * Xabber is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License,
 * along with this program. If not, see http://www.gnu.org/licenses/.
 */
package com.xabber.xmpp.avatar;

import java.io.IOException;

import org.xmlpull.v1.XmlSerializer;

import com.xabber.xmpp.PacketExtension;
import com.xabber.xmpp.SerializerUtils;

/**
 * vCard update packet.
 * <p/>
 * http://xmpp.org/extensions/xep-0153.html
 *
 * @author alexander.ivanov
 */
public class VCardUpdate extends PacketExtension {

    public static final String NAMESPACE = "vcard-temp:x:update";
    public static final String ELEMENT_NAME = "x";

    static final String PHOTO_NAME = "photo";

    private String photoHash;

    /**
     * Create an empty vCard update packet.
     * <p/>
     * Information about photo is not ready to be advertised.
     */
    public VCardUpdate() {
        photoHash = null;
    }

    /**
     * @return Whether information about photo is ready to be advertised.
     */
    public boolean isPhotoReady() {
        return photoHash != null;
    }

    /**
     * @return Whether photo is advertised to be empty.
     */
    public boolean isEmpty() {
        return "".equals(photoHash);
    }

    /**
     * @return Photo's hash.
     */
    public String getPhotoHash() {
        return photoHash;
    }

    /**
     * @param hash photo's hash value. <code>null</code> if information is not
     *             ready to be advertised. Empty string no photo is to be
     *             advertised.
     */
    public void setPhotoHash(String hash) {
        this.photoHash = hash;
    }

    @Override
    public boolean isValid() {
        return true;
    }

    @Override
    public String getElementName() {
        return ELEMENT_NAME;
    }

    @Override
    public String getNamespace() {
        return NAMESPACE;
    }

    @Override
    public void serializeContent(XmlSerializer serializer) throws IOException {
        if (photoHash != null)
            SerializerUtils.addTextTag(serializer, PHOTO_NAME, photoHash);
    }

}
