package eu.siacs.conversations.parser;

import android.util.Log;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;

import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xmpp.jid.Jid;

public abstract class AbstractParser {

	protected XmppConnectionService mXmppConnectionService;

	protected AbstractParser(XmppConnectionService service) {
		this.mXmppConnectionService = service;
	}

    /**
     * Gets the timestamp from the 'delay' element.
     * Refer to XEP-0203: Delayed Delivery for details. @link{http://xmpp.org/extensions/xep-0203.html}
     * @param packet the element to find the child element 'delay' in.
     * @return the time in milli seconds of the attribute 'stamp' of the
     *  element 'delay'. In case there is no 'delay' element or no 'stamp'
     *  attribute or the current time is less than the value of the 'stamp'
     *  attribute the current time is returned.
     */
	protected long getTimestamp(Element packet) {
		long now = System.currentTimeMillis();
		Element delay = packet.findChild("delay");
		if (delay == null) {
			return now;
		}
		String stamp = delay.getAttribute("stamp");
		if (stamp == null) {
			return now;
		}
        /*long time = parseTimestamp(stamp).getTime();
        return now < time ? now : time;*/
        try {
            long time = parseTimestamp(stamp).getTime();
            return now < time ? now : time;
        } catch (ParseException e) {
            return now;
        }
	}

    /**
     * Parses the timestamp according to XEP-0082: XMPP Date and Time Profiles.
     * @link{http://xmpp.org/extensions/xep-0082.html}
     *
     * @param timestamp the timestamp to parse
     * @return Date
     * @throws ParseException
     */
	public static Date parseTimestamp(String timestamp) throws ParseException {
        /*try {
            Log.d("TIMESTAMP", timestamp);
            return DatatypeFactory.newInstance().newXMLGregorianCalendar(timestamp).toGregorianCalendar().getTime();
        } catch (DatatypeConfigurationException e) {
            Log.d("TIMESTAMP", e.getMessage());
            return new Date();
        }*/
        timestamp = timestamp.replace("Z", "+0000");
        SimpleDateFormat dateFormat;
        timestamp = timestamp.substring(0,19)+timestamp.substring(timestamp.length() -5,timestamp.length());
        dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ",Locale.US);
        return dateFormat.parse(timestamp);
	}

	protected void updateLastseen(final Element packet, final Account account,
			final boolean presenceOverwrite) {
		final Jid from = packet.getAttributeAsJid("from");
        updateLastseen(packet, account, from, presenceOverwrite);
    }

    protected void updateLastseen(final Element packet, final Account account, final Jid from,
                                  final boolean presenceOverwrite) {
		final String presence = from == null || from.isBareJid() ? "" : from.getResourcepart();
		final Contact contact = account.getRoster().getContact(from);
		final long timestamp = getTimestamp(packet);
		if (timestamp >= contact.lastseen.time) {
			contact.lastseen.time = timestamp;
			if (!presence.isEmpty() && presenceOverwrite) {
				contact.lastseen.presence = presence;
			}
		}
	}

	protected String avatarData(Element items) {
		Element item = items.findChild("item");
		if (item == null) {
			return null;
		}
		Element data = item.findChild("data", "urn:xmpp:avatar:data");
		if (data == null) {
			return null;
		}
		return data.getContent();
	}
}