/* Contributed in the public domain.
    * Licensed to CS GROUP (CS) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * CS licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.orekit.propagation.events.handlers;
  
  import java.util.List;
  
  import org.hipparchus.ode.events.Action;
  import org.hipparchus.util.Decimal64;
  import org.hipparchus.util.Decimal64Field;
  import org.junit.Assert;
  import org.junit.Test;
  import org.orekit.frames.Frame;
  import org.orekit.frames.FramesFactory;
  import org.orekit.orbits.FieldKeplerianOrbit;
  import org.orekit.orbits.FieldOrbit;
  import org.orekit.orbits.PositionAngle;
  import org.orekit.propagation.FieldSpacecraftState;
  import org.orekit.propagation.events.FieldDateDetector;
  import org.orekit.propagation.events.handlers.FieldRecordAndContinue.Event;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  import org.orekit.utils.Constants;
  
  /**
   * Unit tests for {@link FieldRecordAndContinue}.
   *
   * @author Evan Ward
   */
  public class FieldRecordAndContinueTest {
  
      /** Field. */
      private static final Decimal64Field field = Decimal64Field.getInstance();
  
      /** check add and clear behavior. */
      @Test
      public void testGetEvents() {
          // setup
          FieldRecordAndContinue<FieldDateDetector<Decimal64>, Decimal64> handler =
                  new FieldRecordAndContinue<>();
          FieldAbsoluteDate<Decimal64> date =
                  new FieldAbsoluteDate<>(field, AbsoluteDate.J2000_EPOCH);
          Decimal64 zero = date.getField().getZero();
          FieldDateDetector<Decimal64> detector = new FieldDateDetector<>(date);
          Frame eci = FramesFactory.getGCRF();
          FieldOrbit<Decimal64> orbit = new FieldKeplerianOrbit<>(
                  v(6378137 + 500e3), v(0), v(0), v(0), v(0), v(0),
                  PositionAngle.TRUE, eci, date, zero.add(Constants.EIGEN5C_EARTH_MU));
          FieldSpacecraftState<Decimal64> s1 = new FieldSpacecraftState<>(orbit);
          FieldSpacecraftState<Decimal64> s2 = s1.shiftedBy(-10);
          FieldSpacecraftState<Decimal64> s3 = s2.shiftedBy(1);
          FieldSpacecraftState<Decimal64> s4 = s3.shiftedBy(1);
  
          // actions
          Assert.assertEquals(Action.CONTINUE, handler.eventOccurred(s1, detector, true));
          Assert.assertEquals(Action.CONTINUE, handler.eventOccurred(s2, detector, true));
          Assert.assertEquals(Action.CONTINUE, handler.eventOccurred(s3, detector, false));
  
          // verify
          List<Event<FieldDateDetector<Decimal64>, Decimal64>> events = handler.getEvents();
          Assert.assertEquals(3, events.size());
          Assert.assertEquals(s1, events.get(0).getState());
          Assert.assertEquals(s2, events.get(1).getState());
          Assert.assertEquals(s3, events.get(2).getState());
          Assert.assertEquals(true, events.get(0).isIncreasing());
          Assert.assertEquals(true, events.get(1).isIncreasing());
          Assert.assertEquals(false, events.get(2).isIncreasing());
          for (Event<FieldDateDetector<Decimal64>, Decimal64> event : events) {
              Assert.assertEquals(detector, event.getDetector());
          }
  
          // action: clear
          handler.clear();
  
          // verify is empty
          Assert.assertEquals(0, handler.getEvents().size());
  
          // action add more
          Assert.assertEquals(Action.CONTINUE, handler.eventOccurred(s4, detector, false));
  
          // verify new events
          events = handler.getEvents();
          Assert.assertEquals(1, events.size());
          Assert.assertEquals(s4, events.get(0).getState());
          Assert.assertEquals(false, events.get(0).isIncreasing());
          Assert.assertEquals(detector, events.get(0).getDetector());
     }
 
     /**
      * Box a double value.
      *
      * @param value to copy.
      * @return boxed {@code value}.
      */
     private Decimal64 v(double value) {
         return new Decimal64(value);
     }
 
 }