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package org.yamcs.events;

import org.yamcs.ConfigurationException;
import org.yamcs.YamcsServer;
import org.yamcs.archive.EventRecorder;
import org.yamcs.yarch.protobuf.Db.Event;
import org.yamcs.time.TimeService;
import org.yamcs.utils.TimeEncoding;
import org.yamcs.yarch.Stream;
import org.yamcs.yarch.Tuple;
import org.yamcs.yarch.TupleDefinition;
import org.yamcs.yarch.YarchDatabase;

/**
 * Event producer used from inside Yamcs to report events. It writes directly to the realtime_event stream
 * 
 * 
 * @author nm
 *
 */
public class StreamEventProducer extends AbstractEventProducer {
    final Stream realtimeEventStream;
    final TupleDefinition tdef;
    final TimeService timeService;

    public StreamEventProducer(String yamcsInstance) {
        realtimeEventStream = YarchDatabase.getInstance(yamcsInstance)
                .getStream(EventRecorder.REALTIME_EVENT_STREAM_NAME);
        if (realtimeEventStream == null) {
            throw new ConfigurationException("Cannot find a stream named '" + EventRecorder.REALTIME_EVENT_STREAM_NAME
                    + "' in instance " + yamcsInstance);
        }

        tdef = realtimeEventStream.getDefinition();
        timeService = YamcsServer.getTimeService(yamcsInstance);
    }

    @Override
    public void sendEvent(Event event) {
        Tuple t = new Tuple(tdef, new Object[] { event.getGenerationTime(),
                event.getSource(), event.getSeqNumber(), event });

        realtimeEventStream.emitTuple(t);
    }

    @Override
    public void close() {
        //no resource to release
    }

    @Override
    public long getMissionTime() {
        long t;
        if (timeService == null) {
            t = TimeEncoding.getWallclockTime();
        } else {
            t = timeService.getMissionTime();
        }
        return t;
    }

}