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package nl.vpro.xml.util;

import lombok.extern.slf4j.Slf4j;

import java.time.*;
import java.util.*;

import javax.xml.datatype.*;

import nl.vpro.util.BindingUtils;

/**
 * @author Michiel Meeuwissen
 * @since 0.36
 */
@Slf4j
public class XmlUtils  {

    public static final ZoneId DEFAULT_ZONE = BindingUtils.DEFAULT_ZONE;

    private XmlUtils() {

    }

    static final DatatypeFactory FACTORY;
    static {
        try {
            FACTORY = DatatypeFactory.newInstance();
        } catch (DatatypeConfigurationException e) {
            throw new IllegalStateException();
        }
    }

    @Deprecated
    public static Date toDate(XMLGregorianCalendar in) {
        return in == null ? null : in.toGregorianCalendar().getTime();
    }

    public static Instant toInstant(ZoneId defaultZoneId, XMLGregorianCalendar in) {
        if (in == null) {
            return null;
        }
        if (in.getTimezone() == DatatypeConstants.FIELD_UNDEFINED) {
            TimeZone zone;
            if (defaultZoneId != null) {
                zone = TimeZone.getTimeZone(defaultZoneId);
            } else {
                zone = TimeZone.getTimeZone(DEFAULT_ZONE);
                log.info("{} defines no timezone. Falling back to {}", in, DEFAULT_ZONE);
            }
            return in.toGregorianCalendar(zone, Locale.US, in).getTime().toInstant();
        } else {
            return in.toGregorianCalendar().getTime().toInstant();
        }
    }

    public static ZonedDateTime toZonedDateTime(ZoneId zoneId, XMLGregorianCalendar in) {
        Instant instant = toInstant(zoneId, in);
        return instant == null ? null : instant.atZone(zoneId);
    }

    public static OffsetDateTime toOffsetDateTime(ZoneId zoneId, XMLGregorianCalendar in) {
        Instant instant = toInstant(zoneId, in);
        return instant == null ?  null : instant.atZone(zoneId).toOffsetDateTime();
    }

    /**
     * Parses with zone {@link #DEFAULT_ZONE}
     */

    public static Instant toInstant(XMLGregorianCalendar in) {
        return toInstant(DEFAULT_ZONE, in);
    }

    @Deprecated
    public static XMLGregorianCalendar toXml(Date date) {
        if (date == null) {
            return null;
        }
        return toXml(date.toInstant());
    }

    public static XMLGregorianCalendar toXml(Instant date) {
        if (date == null) {
            return null;
        }
        return toXml(DEFAULT_ZONE, date);
    }


    public static XMLGregorianCalendar toXml(ZoneId zoneId, Instant date) {
        if (date == null) {
            return null;
        }
        GregorianCalendar c = new GregorianCalendar();
        c.setTime(Date.from(date));
        if (zoneId != null) {
            c.setTimeZone(TimeZone.getTimeZone(zoneId));
        }
        return FACTORY.newXMLGregorianCalendar(c);
    }

}