/* 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.utils;
  
  import org.hipparchus.CalculusFieldElement;
  import org.hipparchus.complex.Complex;
  import org.hipparchus.complex.ComplexField;
  import org.hipparchus.geometry.euclidean.threed.FieldVector3D;
  import org.hipparchus.geometry.euclidean.threed.Vector3D;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  import org.orekit.Utils;
  import org.orekit.frames.Frame;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  
  class ExtendedPositionProviderTest {
  
      @Test
      void testGetVelocity() {
          // GIVEN
          final TestExtendedPositionProvider positionProvider = new TestExtendedPositionProvider();
          final Frame frame = Mockito.mock(Frame.class);
          final AbsoluteDate date = AbsoluteDate.J2000_EPOCH;
          // WHEN
          final Vector3D velocity = positionProvider.getVelocity(date, frame);
          // THEN
          final TimeStampedPVCoordinates pvCoordinates = positionProvider.getPVCoordinates(date, frame);
          Assertions.assertEquals(pvCoordinates.getVelocity(), velocity);
      }
  
      @Test
      void testGetPVCoordinates() {
          // GIVEN
          final TestExtendedPositionProvider positionProvider = new TestExtendedPositionProvider();
          final Frame frame = Mockito.mock(Frame.class);
          final AbsoluteDate date = AbsoluteDate.J2000_EPOCH;
          // WHEN
          final TimeStampedPVCoordinates pvCoordinates = positionProvider.getPVCoordinates(date, frame);
          // THEN
          final Vector3D expectedPosition = positionProvider.getPosition(date, frame);
          Assertions.assertEquals(expectedPosition, pvCoordinates.getPosition());
          Assertions.assertEquals(1., pvCoordinates.getVelocity().getX());
          Assertions.assertEquals(0., pvCoordinates.getAcceleration().getNorm());
      }
  
      @Test
      void testGetPVCoordinatesField() {
          // GIVEN
          final TestExtendedPositionProvider positionProvider = new TestExtendedPositionProvider();
          final Frame frame = Mockito.mock(Frame.class);
          final FieldAbsoluteDate<Complex> date = FieldAbsoluteDate.getJ2000Epoch(ComplexField.getInstance());
          // WHEN
          final TimeStampedFieldPVCoordinates<Complex> pvCoordinates = positionProvider.getPVCoordinates(date, frame);
          // THEN
          final FieldVector3D<Complex> expectedPosition = positionProvider.getPosition(date, frame);
          Assertions.assertEquals(expectedPosition, pvCoordinates.getPosition());
          Assertions.assertEquals(1., pvCoordinates.getVelocity().getX().getReal());
          Assertions.assertEquals(0., pvCoordinates.getAcceleration().getNorm().getReal());
      }
  
      @Test
      void testToFieldPVCoordinatesProvider() {
          // GIVEN
          final TestExtendedPositionProvider positionProvider = new TestExtendedPositionProvider();
          final Frame frame = Mockito.mock(Frame.class);
          final FieldAbsoluteDate<Complex> date = FieldAbsoluteDate.getJ2000Epoch(ComplexField.getInstance());
          // WHEN
          final FieldPVCoordinatesProvider<Complex> fieldPVCoordinatesProvider = positionProvider
              .toFieldPVCoordinatesProvider(ComplexField.getInstance());
          // THEN
          final FieldVector3D<Complex> expectedPosition = positionProvider.getPosition(date, frame);
          final FieldVector3D<Complex> actualPosition = fieldPVCoordinatesProvider.getPosition(date, frame);
          Assertions.assertEquals(expectedPosition, actualPosition);
          final FieldPVCoordinates<Complex> expectedPV = positionProvider.getPVCoordinates(date, frame);
          final FieldPVCoordinates<Complex> actualPV = fieldPVCoordinatesProvider.getPVCoordinates(date, frame);
          Assertions.assertEquals(expectedPV.getPosition(), actualPV.getPosition());
          Assertions.assertEquals(expectedPV.getVelocity(), actualPV.getVelocity());
          Assertions.assertEquals(expectedPV.getAcceleration(), actualPV.getAcceleration());
      }
  
      private static class TestExtendedPositionProvider implements ExtendedPositionProvider {
 
         private final AbsoluteDate referenceDate = AbsoluteDate.ARBITRARY_EPOCH;
 
         @Override
         public Vector3D getPosition(AbsoluteDate date, Frame frame) {
             final double shift = date.durationFrom(referenceDate);
             return new Vector3D(1. + shift, 2., 3.);
         }
 
         @Override
         public <T extends CalculusFieldElement<T>> FieldVector3D<T> getPosition(FieldAbsoluteDate<T> date, Frame frame) {
             final T zero = date.getField().getZero();
             final T shift = date.durationFrom(referenceDate);
             return new FieldVector3D<>(zero.newInstance(1.).add(shift), zero.newInstance(2.), zero.newInstance(3.));
         }
     }
 
     @BeforeEach
     public void setUp() {
         Utils.setDataRoot("regular-data");
     }
 
 }