/* 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.control.indirect.adjoint.cost;
  
  import org.hipparchus.util.Binary64;
  import org.hipparchus.util.Binary64Field;
  import org.hipparchus.util.MathArrays;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.orekit.propagation.events.EventDetectionSettings;
  import org.orekit.propagation.events.FieldEventDetectionSettings;
  
  class FieldCartesianEnergyConsideringMassTest {
  
      @Test
      void testGetFieldHamiltonianContribution() {
          // GIVEN
          final FieldTestCost cost = new FieldTestCost(Binary64.ONE);
          final Binary64[] adjoint = MathArrays.buildArray(Binary64Field.getInstance(), 6);
          adjoint[3] = Binary64.ONE;
          // WHEN
          final Binary64 contribution =  cost.getFieldHamiltonianContribution(adjoint, Binary64.ONE);
          // THEN
          Assertions.assertEquals(-1./2, contribution.getReal());
      }
  
      private static class FieldTestCost extends FieldCartesianEnergyConsideringMass<Binary64> {
  
          protected FieldTestCost(Binary64 massFlowRateFactor) {
              super("adjoint", massFlowRateFactor, new FieldEventDetectionSettings<>(massFlowRateFactor.getField(),
                      EventDetectionSettings.getDefaultEventDetectionSettings()));
          }
  
          @Override
          protected Binary64 getFieldThrustForceNorm(Binary64[] adjointVariables, Binary64 mass) {
              return Binary64.ONE;
          }
  
          @Override
          public CartesianCost toCartesianCost() {
              return null;
          }
      }
  }