/**
 * 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.vcard;

import com.xabber.xmpp.AbstractProvider;
import com.xabber.xmpp.Instance;
import com.xabber.xmpp.ProviderUtils;

import org.jivesoftware.smack.util.stringencoder.Base64;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;

abstract class AbstractDataProvider<T extends Instance, Inner extends DataHolder<T>>
        extends AbstractProvider<Inner> {

    @Override
    protected boolean parseInner(XmlPullParser parser, Inner instance) throws IOException, XmlPullParserException {
        if (super.parseInner(parser, instance))
            return true;
        if (instance.getPayload() == null)
            if (!createPayload(parser, instance))
                return false;
        return inflatePayload(parser, instance);
    }

    protected boolean createPayload(XmlPullParser parser, Inner instance) {
        if (AbstractBinaryData.TYPE_NAME.equals(parser.getName())
                || AbstractBinaryData.BINVAL_NAME.equals(parser.getName()))
            instance.setPayload(createBinaryData());
        else if (AbstractExternalData.EXTVAL_NAME.equals(parser.getName()))
            instance.setPayload(createExternalData());
        else
            return false;
        return true;
    }

    protected abstract T createBinaryData();

    protected abstract T createExternalData();

    protected boolean inflatePayload(XmlPullParser parser, Inner instance) throws IOException, XmlPullParserException {
        if (instance.getPayload() instanceof AbstractBinaryData)
            return inflateBinaryData(parser,
                    (AbstractBinaryData) instance.getPayload());
        else if (instance.getPayload() instanceof AbstractExternalData)
            return inflateExternalData(parser,
                    (AbstractExternalData) instance.getPayload());
        else
            return false;
    }

    protected boolean inflateBinaryData(XmlPullParser parser, AbstractBinaryData payload) throws IOException, XmlPullParserException {
        if (AbstractBinaryData.TYPE_NAME.equals(parser.getName()))
            payload.setType(ProviderUtils.parseText(parser));
        else if (AbstractBinaryData.BINVAL_NAME.equals(parser.getName())) {
            String value;
            try {
                value = ProviderUtils.parseText(parser,
                        AbstractBinaryData.MAX_ENCODED_DATA_SIZE);
            } catch (Exception e) {
                return true;
            }
            payload.setData(Base64.decode(value));
        } else
            return false;
        return true;
    }

    protected boolean inflateExternalData(XmlPullParser parser, AbstractExternalData payload) throws IOException, XmlPullParserException {
        if (AbstractExternalData.EXTVAL_NAME.equals(parser.getName()))
            payload.setValue(ProviderUtils.parseText(parser));
        else
            return false;
        return true;
    }

}