/* Copyright 2022-2025 Romain Serra
    * 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.sampling;
  
  import org.hipparchus.util.Binary64;
  import org.hipparchus.util.Binary64Field;
  import org.junit.jupiter.api.Test;
  import org.orekit.TestUtils;
  import org.orekit.propagation.FieldSpacecraftState;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  class FieldPropagationStepRecorderTest {
  
      @Test
      void copyStatesAtConstructionTest() {
          // GIVEN
          final FieldPropagationStepRecorder<Binary64> recorder = new FieldPropagationStepRecorder<>();
          // WHEN
          final List<FieldSpacecraftState<Binary64>> states = recorder.copyStates();
          // THEN
          assertEquals(0, states.size());
      }
  
      @Test
      void copyStatesTest() {
          // GIVEN
          final FieldPropagationStepRecorder<Binary64> recorder = new FieldPropagationStepRecorder<>();
          final FieldOrekitStepInterpolator<Binary64> interpolator = createInterpolator();
          recorder.handleStep(interpolator);
          // WHEN
          recorder.init(createState(), FieldAbsoluteDate.getArbitraryEpoch(Binary64Field.getInstance()));
          // THEN
          final List<FieldSpacecraftState<Binary64>> states = recorder.copyStates();
          assertEquals(0, states.size());
      }
  
      @Test
      void handleStepTest() {
          // GIVEN
          final FieldPropagationStepRecorder<Binary64> recorder = new FieldPropagationStepRecorder<>();
          final FieldOrekitStepInterpolator<Binary64> interpolator = createInterpolator();
          final int expectedSize = 10;
          // WHEN
          for (int i = 0; i < expectedSize; ++i) {
              recorder.handleStep(interpolator);
          }
          // WHEN
          final List<FieldSpacecraftState<Binary64>> states = recorder.copyStates();
          assertEquals(expectedSize, states.size());
      }
  
      private static FieldOrekitStepInterpolator<Binary64> createInterpolator() {
          return new FieldOrekitStepInterpolator<Binary64>() {
              @Override
              public FieldSpacecraftState<Binary64> getPreviousState() {
                  return null;
              }
  
              @Override
              public FieldSpacecraftState<Binary64> getCurrentState() {
                  return createState();
              }
  
              @Override
              public FieldSpacecraftState<Binary64> getInterpolatedState(FieldAbsoluteDate<Binary64> date) {
                  return null;
              }
  
              @Override
              public boolean isForward() {
                  return false;
              }
  
              @Override
              public FieldOrekitStepInterpolator<Binary64> restrictStep(FieldSpacecraftState<Binary64> newPreviousState, FieldSpacecraftState<Binary64> newCurrentState) {
                  return null;
              }
          };
      }
 
     private static FieldSpacecraftState<Binary64> createState() {
         final SpacecraftState state = new SpacecraftState(TestUtils.getDefaultOrbit(AbsoluteDate.ARBITRARY_EPOCH));
         return new FieldSpacecraftState<>(Binary64Field.getInstance(), state);
     }
 }