/**
 * 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.time;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.xmlpull.v1.XmlPullParser;

import com.xabber.xmpp.AbstractIQProvider;
import com.xabber.xmpp.ProviderUtils;

public class TimeProvider extends AbstractIQProvider<Time> {

    private final static Pattern TZO = Pattern.compile(
            "^([+-])(\\d{2}):(\\d{2})$|^(Z)$", Pattern.CASE_INSENSITIVE);

    @Override
    protected boolean parseInner(XmlPullParser parser, Time instance)
            throws Exception {
        if (super.parseInner(parser, instance))
            return true;
        String name = parser.getName();
        if (Time.TZO_NAME.equals(name)) {
            String value = ProviderUtils.parseText(parser);
            Matcher matcher = TZO.matcher(value);
            if (matcher.matches()) {
                String z = matcher.group(4);
                if (z == null) {
                    int hours = Integer.valueOf(matcher.group(2));
                    int minutes = Integer.valueOf(matcher.group(3));
                    if (hours >= 0 && hours <= 23 && minutes >= 0
                            && minutes <= 59) {
                        int tzo = hours * 60 + minutes;
                        if ("-".equals(matcher.group(1)))
                            tzo = -tzo;
                        instance.setTzo(tzo);
                    }
                } else {
                    instance.setTzo(0);
                }
            }
        } else if (Time.UTC_NAME.equals(name)) {
            instance.setUtc(ProviderUtils.parseDateTime(parser));
        } else
            return false;
        return true;
    }

    @Override
    protected Time createInstance(XmlPullParser parser) {
        return new Time();
    }

}
