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  package org.orekit.forces.maneuvers.trigger;
  
  import java.util.Collections;
  import java.util.List;
  
  import org.hipparchus.CalculusFieldElement;
  import org.hipparchus.Field;
  import org.hipparchus.util.Binary64Field;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.orekit.propagation.events.DateDetector;
  import org.orekit.propagation.events.FieldEventDetector;
  import org.orekit.propagation.events.intervals.FieldAdaptableInterval;
  import org.orekit.propagation.events.FieldDateDetector;
  import org.orekit.propagation.events.handlers.StopOnEvent;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  import org.orekit.time.TimeStamped;
  import org.orekit.utils.ParameterDriver;
  
  class IntervalEventTriggerTest extends AbstractManeuverTriggersTest<IntervalEventTrigger<DateDetector>> {
  
      public static class IntervalDates extends IntervalEventTrigger<DateDetector> {
  
          public IntervalDates(final AbsoluteDate start, final AbsoluteDate stop) {
              super(new DateDetector(start, stop).
                    withMaxCheck(0.5 * stop.durationFrom(start)).
                    withThreshold(1.0e-10).
                    withHandler(new StopOnEvent()));
          }
  
          @Override
          protected <D extends FieldEventDetector<S>, S extends CalculusFieldElement<S>>
              D convertIntervalDetector(Field<S> field, DateDetector detector) {
              final FieldAdaptableInterval<S> maxCheck  = (s, isForward) -> detector.getMaxCheckInterval().currentInterval(s.toSpacecraftState(), isForward);
              final S                    threshold = field.getZero().newInstance(detector.getThreshold());
              final FieldAbsoluteDate<S> d0 = new FieldAbsoluteDate<>(field, detector.getDates().get(0).getDate());
              final FieldAbsoluteDate<S> d1 = new FieldAbsoluteDate<>(field, detector.getDates().get(1).getDate());
              @SuppressWarnings("unchecked")
              final D converted =
                  (D) new FieldDateDetector<>(field, d0, d1).
                                                withMaxCheck(maxCheck).
                                                withThreshold(threshold);
              return converted;
          }
  
          @Override
          public List<ParameterDriver> getParametersDrivers() {
              return Collections.emptyList();
          }
  
      }
  
      protected IntervalDates createTrigger(final AbsoluteDate start, final AbsoluteDate stop) {
          return new IntervalDates(start, stop);
      }
  
      @Test
      void testComponents() {
          IntervalDates trigger = createTrigger(AbsoluteDate.J2000_EPOCH,
                                                AbsoluteDate.J2000_EPOCH.shiftedBy(100.0));
          final List<TimeStamped>    dates = trigger.getFiringIntervalDetector().getDates();
          Assertions.assertEquals(1,     trigger.getEventDetectors().count());
          Assertions.assertEquals(1,     trigger.getFieldEventDetectors(Binary64Field.getInstance()).count());
          Assertions.assertEquals(2,     dates.size());
          Assertions.assertEquals(  0.0, dates.get(0).getDate().durationFrom(AbsoluteDate.J2000_EPOCH), 1.0e-10);
          Assertions.assertEquals(100.0, dates.get(1).getDate().durationFrom(AbsoluteDate.J2000_EPOCH), 1.0e-10);
      }
  
  }