/* Copyright 2022-2025 Thales Alenia Space
    * 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.time;
  
  import org.hipparchus.CalculusFieldElement;
  import org.hipparchus.Field;
  import org.hipparchus.util.Binary64Field;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.orekit.Utils;
  
  public class PerfectClockModelTest {
  
      @Test
      public void testZero() {
          final AbsoluteDate       t0      = new AbsoluteDate(2020, 4, 1, TimeScalesFactory.getUTC());
          final PerfectClockModel clockModel = new PerfectClockModel();
          for (double dt = 0.02; dt < 0.98; dt += 0.02) {
              final ClockOffset co = clockModel.getOffset(t0.shiftedBy(dt));
              Assertions.assertEquals(dt, co.getDate().durationFrom(t0), 1.0e-15);
              Assertions.assertEquals(0,  co.getOffset(),                1.0e-15);
              Assertions.assertEquals(0,  co.getRate(),                  1.0e-15);
              Assertions.assertEquals(0,  co.getAcceleration(),          1.0e-15);
          }
  
      }
  
      @Test
      public void testZeroField() {
          doTestZero(Binary64Field.getInstance());
      }
  
      public <T extends CalculusFieldElement<T>> void doTestZero(final Field<T> field) {
          final AbsoluteDate         t0  = new AbsoluteDate(2020, 4, 1, TimeScalesFactory.getUTC());
          final FieldAbsoluteDate<T> t0F = new FieldAbsoluteDate<>(field, t0);
          final PerfectClockModel clockModel = new PerfectClockModel();
          for (double dt = 0.02; dt < 0.98; dt += 0.02) {
              final T dtF = field.getZero().newInstance(dt);
              final FieldClockOffset<T> co = clockModel.getOffset(t0F.shiftedBy(dtF));
              Assertions.assertEquals(dt, co.getDate().durationFrom(t0).getReal(), 1.0e-15);
              Assertions.assertEquals(0,  co.getOffset().getReal(),                1.0e-15);
              Assertions.assertEquals(0,  co.getRate().getReal(),                  1.0e-15);
              Assertions.assertEquals(0,  co.getAcceleration().getReal(),          1.0e-15);
          }
      }
  
      @BeforeEach
      public void setUp() throws Exception {
          Utils.setDataRoot("regular-data");
      }
  
  }