/**
 * Copyright (C) 2004-2011 Jive Software. All rights reserved.
 *
 * Licensed 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.jivesoftware.sparkimpl.plugin.manager;

import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.provider.ExtensionElementProvider;
import org.jivesoftware.smack.xml.XmlPullParser;
import org.jivesoftware.smack.xml.XmlPullParserException;
import org.jxmpp.JxmppContext;

import javax.xml.namespace.QName;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


public class Features implements ExtensionElement {

    private final List<String> availableFeatures = new ArrayList<>();


    public List<String> getAvailableFeatures() {
        return availableFeatures;
    }

    public void addFeature(String feature) {
        availableFeatures.add(feature);
    }

    /**
     * Element name of the packet extension.
     */
    public static final String ELEMENT = "event";

    /**
     * Namespace of the packet extension.
     */
    public static final String NAMESPACE = "http://jabber.org/protocol/disco#info";

    public static final QName QNAME = new QName(NAMESPACE, ELEMENT);


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

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

    @Override
	public String toXML(XmlEnvironment xmlEnvironment) {
        return ( "<event xmlns=\"" + NAMESPACE + "\"" ) + "</event>";
    }

    public static class Provider extends ExtensionElementProvider<Features>
    {
        public Provider() {
        }

        @Override
        public Features parse( XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment, JxmppContext jxmppContext) throws XmlPullParserException, IOException {
            Features features = new Features();
            boolean done = false;
            while (!done) {
                XmlPullParser.Event eventType = parser.next();
                if (eventType == XmlPullParser.Event.START_ELEMENT && "event".equals(parser.getName())) {
                    parser.nextText();
                }
                if (eventType == XmlPullParser.Event.START_ELEMENT && "feature".equals(parser.getName())) {
                    String feature = parser.getAttributeValue("", "var");
                    features.addFeature(feature);
                }
                else if (eventType == XmlPullParser.Event.END_ELEMENT) {
                    if ("event".equals(parser.getName())) {
                        done = true;
                    }
                }
            }

            return features;
        }
    }
}
