/* 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.frames;
  
  import org.hipparchus.CalculusFieldElement;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  import org.orekit.utils.AngularCoordinates;
  import org.orekit.utils.FieldAngularCoordinates;
  
  /**
   * Transform provider used to match the orientation of a given frame.
   *
   * @author Evan M. Ward
   * @see OriginTransformProvider
   * @see org.orekit.files.ccsds.definitions.ModifiedFrame
   * @since 14.0
   */
  public class AngularTransformProvider implements TransformProvider {
  
      /** Parent frame. */
      private final Frame parent;
      /** Orientation provider. */
      private final Frame orientation;
  
      /**
       * Construct a transform provide that generates angular transforms from
       * {@code parent} to {@code orientation}. Useful for creating a new frame
       * centered on {@code parent} and with the same orientation as
       * {@code orientation}.
       *
       * @param parent      frame.
       * @param orientation provider.
       */
      public AngularTransformProvider(final Frame parent,
                                      final Frame orientation) {
          this.parent = parent;
          this.orientation = orientation;
      }
  
      @Override
      public Transform getTransform(final AbsoluteDate date) {
          final AngularCoordinates angular =
                  parent.getTransformTo(orientation, date).getAngular();
          return new Transform(date, angular);
      }
  
      @Override
      public <T extends CalculusFieldElement<T>> FieldTransform<T>
          getTransform(final FieldAbsoluteDate<T> date) {
  
          final FieldAngularCoordinates<T> angular =
                  parent.getTransformTo(orientation, date).getAngular();
          return new FieldTransform<>(date, angular);
      }
  
      @Override
      public KinematicTransform getKinematicTransform(final AbsoluteDate date) {
          final KinematicTransform xform =
                  parent.getKinematicTransformTo(orientation, date);
          return KinematicTransform
                  .of(date, xform.getRotation(), xform.getRotationRate());
      }
  
      @Override
      public <T extends CalculusFieldElement<T>> FieldKinematicTransform<T>
          getKinematicTransform(final FieldAbsoluteDate<T> date) {
  
          final FieldKinematicTransform<T> xform =
                  parent.getKinematicTransformTo(orientation, date);
          return FieldKinematicTransform
                  .of(date, xform.getRotation(), xform.getRotationRate());
      }
  
      @Override
      public StaticTransform getStaticTransform(final AbsoluteDate date) {
          final StaticTransform xform =
                  parent.getStaticTransformTo(orientation, date);
          return StaticTransform.of(date, xform.getRotation());
      }
  
      @Override
      public <T extends CalculusFieldElement<T>> FieldStaticTransform<T>
          getStaticTransform(final FieldAbsoluteDate<T> date) {
  
         final FieldStaticTransform<T> xform =
                 parent.getStaticTransformTo(orientation, date);
         return FieldStaticTransform.of(date, xform.getRotation());
     }
 
 }