/* 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.data;
  
  import org.hamcrest.MatcherAssert;
  import org.hipparchus.ode.nonstiff.ClassicalRungeKuttaIntegrator;
  import org.junit.Assert;
  import org.junit.Test;
  import org.orekit.OrekitMatchers;
  import org.orekit.Utils;
  import org.orekit.attitudes.AttitudeProvider;
  import org.orekit.attitudes.InertialProvider;
  import org.orekit.errors.OrekitException;
  import org.orekit.errors.OrekitMessages;
  import org.orekit.frames.Frame;
  import org.orekit.frames.LazyLoadedFrames;
  import org.orekit.orbits.KeplerianOrbit;
  import org.orekit.orbits.Orbit;
  import org.orekit.orbits.PositionAngle;
  import org.orekit.propagation.Propagator;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.propagation.analytical.KeplerianPropagator;
  import org.orekit.propagation.numerical.NumericalPropagator;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.LazyLoadedTimeScales;
  import org.orekit.utils.Constants;
  import org.orekit.utils.IERSConventions;
  import org.orekit.utils.TimeStampedPVCoordinates;
  
  /**
   * Test for {@link ExceptionalDataContext}.
   *
   * @author Evan Ward
   */
  public class ExceptionalDataContextTest {
  
      /** Check the methods throw exceptions. */
      @Test
      public void testThrows() {
          // setup
          ExceptionalDataContext context = new ExceptionalDataContext();
  
          // verify
          try {
              context.getCelestialBodies();
              Assert.fail("Expected Exception");
          } catch (OrekitException e) {
              Assert.assertEquals(e.getSpecifier(), OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
          }
          try {
              context.getFrames();
              Assert.fail("Expected Exception");
          } catch (OrekitException e) {
              Assert.assertEquals(e.getSpecifier(), OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
          }
          try {
              context.getGeoMagneticFields();
              Assert.fail("Expected Exception");
          } catch (OrekitException e) {
              Assert.assertEquals(e.getSpecifier(), OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
          }
          try {
              context.getGravityFields();
              Assert.fail("Expected Exception");
          } catch (OrekitException e) {
              Assert.assertEquals(e.getSpecifier(), OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
          }
          try {
              context.getTimeScales();
              Assert.fail("Expected Exception");
          } catch (OrekitException e) {
              Assert.assertEquals(e.getSpecifier(), OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
          }
      }
  
      /** Check it can be set as the default data context with the right precautions. */
      @Test
      public void testDefault() {
          // setup
          Utils.setDataRoot("regular-data");
          // hack to initialize static fields that need the default data context
          hack();
          LazyLoadedDataContext context = DataContext.getDefault();
          DataContext.setDefault(new ExceptionalDataContext());
  
         // verify by running some code
         LazyLoadedTimeScales timeScales = context.getTimeScales();
         LazyLoadedFrames frames = context.getFrames();
         Frame eci = frames.getEME2000();
         Frame ecef = frames.getITRF(IERSConventions.IERS_2010, true);
         AbsoluteDate date = new AbsoluteDate(2019, 12, 20, timeScales.getUTC());
         double a = 6378e3 + 500e3;
         Orbit orbit = new KeplerianOrbit(
                 a, 0, 0, 0, 0, 0,
                 PositionAngle.TRUE, eci, date, Constants.EIGEN5C_EARTH_MU);
         AttitudeProvider attitude = new InertialProvider(eci);
         Propagator propagator = new KeplerianPropagator(orbit, attitude);
         SpacecraftState state = propagator.propagate(date.shiftedBy(86400));
         TimeStampedPVCoordinates pv = state.getPVCoordinates(ecef);
         MatcherAssert.assertThat(
                 pv.getPosition().getNorm(),
                 OrekitMatchers.relativelyCloseTo(a, 10));
 
         // verify using default data context throws an exception
         try {
             new NumericalPropagator(new ClassicalRungeKuttaIntegrator(60.0));
             Assert.fail("Expected Exception");
         } catch (OrekitException e) {
             Assert.assertEquals(e.getSpecifier(), OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
         }
 
     }
 
     /**
      * Force initialization of classes that have static fields that use the default data
      * context. See JLS 12.4.1 "When Initialization Occurs".
      */
     private void hack() {
         Object o = AbsoluteDate.ARBITRARY_EPOCH;
         Assert.assertNotNull(o);
     }
 
 }