/* Copyright 2002-2022 CS GROUP
    * 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.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  import org.orekit.Utils;
  import org.orekit.utils.Constants;
  
  public class GalileoScaleTest {
  
      @Test
      public void testT0() {
          TimeScale scale = TimeScalesFactory.getGST();
          Assert.assertEquals("GST", scale.toString());
          AbsoluteDate t0 =
              new AbsoluteDate(new DateComponents(1999, 8, 22), TimeComponents.H00, scale);
          Assert.assertEquals(AbsoluteDate.GALILEO_EPOCH, t0);
      }
  
      @Test
      public void test2006() {
          AbsoluteDate tGalileo =
              new AbsoluteDate(new DateComponents(2006, 1, 2), TimeComponents.H00, TimeScalesFactory.getGST());
          AbsoluteDate tUTC =
              new AbsoluteDate(new DateComponents(2006, 1, 1), new TimeComponents(23, 59, 46),
                               TimeScalesFactory.getUTC());
          Assert.assertEquals(tUTC, tGalileo);
      }
  
      @Test
      public void testDuringLeap() {
          final TimeScale utc   = TimeScalesFactory.getUTC();
          final TimeScale scale = TimeScalesFactory.getGST();
          final AbsoluteDate before = new AbsoluteDate(new DateComponents(1983, 06, 30),
                                                       new TimeComponents(23, 59, 59),
                                                       utc);
          final AbsoluteDate during = before.shiftedBy(1.25);
          Assert.assertEquals(61, utc.minuteDuration(during));
          Assert.assertEquals(1.0, utc.getLeap(during), 1.0e-10);
          Assert.assertEquals(60, scale.minuteDuration(during));
          Assert.assertEquals(0.0, scale.getLeap(during), 1.0e-10);
      }
  
      @Test
      public void testConstant() {
          TimeScale scale = TimeScalesFactory.getGST();
          double reference = scale.offsetFromTAI(AbsoluteDate.J2000_EPOCH);
          for (double dt = -10000; dt < 10000; dt += 123.456789) {
              AbsoluteDate date = AbsoluteDate.J2000_EPOCH.shiftedBy(dt * Constants.JULIAN_DAY);
              Assert.assertEquals(reference, scale.offsetFromTAI(date), 1.0e-15);
          }
      }
  
      @Test
      public void testSameAsGPS() {
          TimeScale gst = TimeScalesFactory.getGST();
          TimeScale gps = TimeScalesFactory.getGPS();
          for (double dt = -10000; dt < 10000; dt += 123.456789) {
              AbsoluteDate date = AbsoluteDate.J2000_EPOCH.shiftedBy(dt * Constants.JULIAN_DAY);
              Assert.assertEquals(gps.offsetFromTAI(date), gst.offsetFromTAI(date), 1.0e-15);
          }
      }
  
      @Test
      public void testSymmetry() {
          TimeScale scale = TimeScalesFactory.getGST();
          for (double dt = -10000; dt < 10000; dt += 123.456789) {
              AbsoluteDate date = AbsoluteDate.J2000_EPOCH.shiftedBy(dt * Constants.JULIAN_DAY);
              double dt1 = scale.offsetFromTAI(date);
              DateTimeComponents components = date.getComponents(scale);
              double dt2 = scale.offsetToTAI(components.getDate(), components.getTime());
              Assert.assertEquals( 0.0, dt1 + dt2, 1.0e-10);
          }
      }
  
      @Before
      public void setUp() {
          Utils.setDataRoot("regular-data");
      }
  
  }