/* Copyright 2002-2025 CS GROUP
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    * 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,
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   * See the License for the specific language governing permissions and
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  package org.orekit.files.rinex.observation;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.orekit.Utils;
  import org.orekit.errors.OrekitIllegalArgumentException;
  import org.orekit.errors.OrekitMessages;
  import org.orekit.gnss.SatInSystem;
  import org.orekit.gnss.SatelliteSystem;
  import org.orekit.time.AbsoluteDate;
  
  public class RinexObservationTest {
  
      @BeforeEach
      public void setUp() {
          // Sets the root of data to read
          Utils.setDataRoot("regular-data");
      }
  
      @Test
      public void testGenerateRegular() {
          final double interval = 300.0;
          final int    n        = 100;
          RinexObservation rinexObservation = generate(AbsoluteDate.ARBITRARY_EPOCH,
                                                       AbsoluteDate.ARBITRARY_EPOCH.shiftedBy((n - 1) * interval),
                                                       interval, n);
          Assertions.assertEquals(n, rinexObservation.getObservationDataSets().size());
      }
  
      @Test
      public void testWrongSampling() {
          final double interval = 300.0;
          final int    n        = 100;
          RinexObservation rinexObservation = generate(AbsoluteDate.ARBITRARY_EPOCH,
                                                       AbsoluteDate.ARBITRARY_EPOCH.shiftedBy((n - 1) * interval),
                                                       interval, n - 10);
          final List<ObservationDataSet> ods = rinexObservation.getObservationDataSets();
          final AbsoluteDate lastGenerated = ods.get(ods.size() - 1).getDate();
          try {
              rinexObservation.addObservationDataSet(dummyMeasurement(lastGenerated.shiftedBy(0.75 * interval)));
              Assertions.fail("an exception should have been thrown");
          } catch (OrekitIllegalArgumentException oiae) {
              Assertions.assertEquals(OrekitMessages.INCONSISTENT_SAMPLING_DATE, oiae.getSpecifier());
          }
      }
  
      @Test
      public void testOutOfRange() {
          final double interval = 300.0;
          final int    n        = 100;
          RinexObservation rinexObservation = generate(AbsoluteDate.ARBITRARY_EPOCH,
                                                       AbsoluteDate.ARBITRARY_EPOCH.shiftedBy((n - 1) * interval),
                                                       interval, n);
          final List<ObservationDataSet> ods = rinexObservation.getObservationDataSets();
          final AbsoluteDate lastGenerated = ods.get(ods.size() - 1).getDate();
          try {
              rinexObservation.addObservationDataSet(dummyMeasurement(lastGenerated.shiftedBy(interval)));
              Assertions.fail("an exception should have been thrown");
          } catch (OrekitIllegalArgumentException oiae) {
              Assertions.assertEquals(OrekitMessages.OUT_OF_RANGE_DATE, oiae.getSpecifier());
          }
      }
  
      private RinexObservation generate(final AbsoluteDate first, final AbsoluteDate last,
                                        final double interval, final int n) {
          final RinexObservation rinexObservation = new RinexObservation();
          rinexObservation.getHeader().setInterval(interval);
          rinexObservation.getHeader().setTFirstObs(first);
          rinexObservation.getHeader().setTLastObs(last);
          for (int i = 0; i < n; ++i) {
              rinexObservation.addObservationDataSet(dummyMeasurement(first.shiftedBy(i * interval)));
          }
          return rinexObservation;
      }
  
      private ObservationDataSet dummyMeasurement(final AbsoluteDate date) {
          return new ObservationDataSet(new SatInSystem(SatelliteSystem.GALILEO, 11),
                                        date, 0, 0, new ArrayList<>());
      }
 
 }