/* 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.forces.radiation;
  
  import org.hipparchus.CalculusFieldElement;
  import org.hipparchus.Field;
  import org.hipparchus.geometry.euclidean.threed.FieldVector3D;
  import org.hipparchus.geometry.euclidean.threed.Vector3D;
  import org.orekit.propagation.FieldSpacecraftState;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.propagation.events.EventDetector;
  import org.orekit.propagation.events.FieldEventDetector;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  import org.orekit.utils.ParameterDriver;
  
  import java.util.List;
  import java.util.stream.Stream;
  
  /**
   * Class representing a light-induced radiation pressure force, by leveraging on a given flux model.
   *
   * <p>
   *     This class should not be used in addition to {@link SolarRadiationPressure}, which is another way of
   *     representing the same orbital perturbation.
   * </p>
   *
   * @author Romain Serra
   * @see LightFluxModel
   * @see RadiationSensitive
   * @since 12.1
   */
  public class RadiationPressureModel implements RadiationForceModel {
  
      /**
       * Light flux model (including eclipse conditions).
       */
      private final LightFluxModel lightFluxModel;
  
      /**
       * Object defining radiation properties defining the acceleration from the pressure.
       */
      private final RadiationSensitive radiationSensitive;
  
      /**
       * Constructor.
       * @param lightFluxModel model for light flux
       * @param radiationSensitive object defining radiation properties
       */
      public RadiationPressureModel(final LightFluxModel lightFluxModel,
                                    final RadiationSensitive radiationSensitive) {
          this.lightFluxModel = lightFluxModel;
          this.radiationSensitive = radiationSensitive;
      }
  
      /**
       * Getter for radiation sensitive object.
       * @return radiation sensitive object
       */
      public RadiationSensitive getRadiationSensitive() {
          return radiationSensitive;
      }
  
      /**
       * Getter for light flux model.
       * @return flux model
       */
      public LightFluxModel getLightFluxModel() {
          return lightFluxModel;
      }
  
      /** {@inheritDoc} */
      @Override
      public void init(final SpacecraftState initialState, final AbsoluteDate target) {
          RadiationForceModel.super.init(initialState, target);
          lightFluxModel.init(initialState, target);
      }
  
      /** {@inheritDoc} */
      @Override
      public <T extends CalculusFieldElement<T>> void init(final FieldSpacecraftState<T> initialState,
                                                           final FieldAbsoluteDate<T> target) {
          RadiationForceModel.super.init(initialState, target);
          lightFluxModel.init(initialState, target);
      }
 
     /** {@inheritDoc} */
     @Override
     public Vector3D acceleration(final SpacecraftState s, final double[] parameters) {
         final Vector3D fluxVector = lightFluxModel.getLightFluxVector(s);
         return radiationSensitive.radiationPressureAcceleration(s, fluxVector, parameters);
     }
 
     /** {@inheritDoc} */
     @Override
     public <T extends CalculusFieldElement<T>> FieldVector3D<T> acceleration(final FieldSpacecraftState<T> s, final T[] parameters) {
         final FieldVector3D<T> fluxVector = lightFluxModel.getLightFluxVector(s);
         return radiationSensitive.radiationPressureAcceleration(s, fluxVector, parameters);
     }
 
     /** {@inheritDoc} */
     @Override
     public List<ParameterDriver> getParametersDrivers() {
         return radiationSensitive.getRadiationParametersDrivers();
     }
 
     /** {@inheritDoc} */
     @Override
     public Stream<EventDetector> getEventDetectors() {
         final List<EventDetector> eventDetectors = lightFluxModel.getEclipseConditionsDetector();
         return Stream.concat(RadiationForceModel.super.getEventDetectors(), eventDetectors.stream());
     }
 
     /** {@inheritDoc} */
     @Override
     public <T extends CalculusFieldElement<T>> Stream<FieldEventDetector<T>> getFieldEventDetectors(final Field<T> field) {
         final List<FieldEventDetector<T>> eventDetectors = lightFluxModel.getFieldEclipseConditionsDetector(field);
         return Stream.concat(RadiationForceModel.super.getFieldEventDetectors(field), eventDetectors.stream());
     }
 }