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package org.dcache.alarms;

import com.google.common.base.Preconditions;
import org.slf4j.IMarkerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;
import java.util.Iterator;

/**
 * Provides internal API for constructing alarm markers.
 *
 * @author arossi
 */
public final class AlarmMarkerFactory {
    /**
     * The base marker; all alarms must carry this marker.
     */
    private static final String ALARM_MARKER = "ALARM";

    /**
     * The type marker; submarker indicates the alarm type.
     */
    private static final String ALARM_MARKER_TYPE = "ALARM_TYPE";

    /**
     * The key marker; submarker specifies the key properties determining alarm
     * identity.
     */
    private static final String ALARM_MARKER_KEY = "ALARM_KEY";
    private static final IMarkerFactory factory = MarkerFactory.getIMarkerFactory();

    public static Marker getMarker() {
        return getMarker(null, (String[]) null);
    }

    public static Marker getMarker(PredefinedAlarm type) {
        return getMarker(type, (String[]) null);
    }

    public static Marker getMarker(PredefinedAlarm type, String... keywords) {
        Marker alarmMarker = factory.getDetachedMarker(ALARM_MARKER);
        if (type == null) {
            return alarmMarker;
        }
        Marker typeMarker = factory.getDetachedMarker(ALARM_MARKER_TYPE);
        Marker alarmType = factory.getDetachedMarker(type.toString());
        typeMarker.add(alarmType);
        alarmMarker.add(typeMarker);
        if (keywords != null) {
            Marker keyMarker = factory.getDetachedMarker(ALARM_MARKER_KEY);
            for (String keyword : keywords) {
                Marker alarmKey = factory.getDetachedMarker(keyword);
                keyMarker.add(alarmKey);
            }
            alarmMarker.add(keyMarker);
        }
        return alarmMarker;
    }

    public static boolean containsAlarmMarker(Marker marker) {
        return marker != null && marker.contains(ALARM_MARKER);
    }

    public static Marker getKeySubmarker(Marker marker) {
        return getSubmarker(marker, ALARM_MARKER_KEY);
    }

    public static Marker getTypeSubmarker(Marker marker) {
        return getSubmarker(marker, ALARM_MARKER_TYPE);
    }

    private static Marker getSubmarker(Marker marker, String name) {
        Preconditions.checkNotNull(marker);
        Preconditions.checkNotNull(name);
        for (Iterator<Marker> m = marker.iterator(); m.hasNext();) {
            Marker next = m.next();
            if (name.equals(next.getName())) {
                return next;
            }
        }
        return null;
    }
}