/* Copyright 2002-2025 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,
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   * See the License for the specific language governing permissions and
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  package org.orekit.files.ilrs;
  
  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.attitudes.FrameAlignedProvider;
  import org.orekit.data.DataSource;
  import org.orekit.files.ilrs.CPF.CPFEphemeris;
  import org.orekit.files.ilrs.StreamingCpfWriter.Segment;
  import org.orekit.frames.Frame;
  import org.orekit.propagation.BoundedPropagator;
  import org.orekit.time.TimeScale;
  import org.orekit.time.TimeScalesFactory;
  import org.orekit.utils.TimeStampedPVCoordinates;
  
  import java.io.ByteArrayInputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.List;
  
  
  public class StreamingCpfWriterTest {
  
      /** Set Orekit data. */
      @BeforeEach
      public void setUp() {
          Utils.setDataRoot("regular-data");
      }
  
      /**
       * Check reading and writing a CPF both with and without using the step handler
       * methods.
       */
      @Test
      public void testWriteCpfStepHandler() throws Exception {
  
          // Time scale
          TimeScale utc = TimeScalesFactory.getUTC();
          // Create a list of files for testing
          List<String> files =
                  Arrays.asList("/ilrs/jason3_cpf_180613_16401.cne",
                                "/ilrs/lageos1_cpf_180613_16401.hts",
                                "/ilrs/galileo212_cpf_180613_6641.esa");
          for (final String ex : files) {
              DataSource source0 = new DataSource(ex, () -> getClass().getResourceAsStream(ex));
              CPF cpfFile = new CPFParser().parse(source0);
  
              CPFEphemeris satellite =
                              cpfFile.getSatellites().values().iterator().next();
              Frame frame = satellite.getFrame();
              double step = satellite.getStop()
                              .durationFrom(satellite.getStart()) /
                              (satellite.getCoordinates().size() - 1);
  
              Assertions.assertEquals(step, cpfFile.getHeader().getStep(), 0.1);
              StringBuilder buffer = new StringBuilder();
              StreamingCpfWriter writer = new StreamingCpfWriter(buffer, utc, cpfFile.getHeader());
              writer.writeHeader();
              Segment segment = writer.newSegment(frame);
              BoundedPropagator propagator = satellite.getPropagator(new FrameAlignedProvider(frame));
              propagator.setStepHandler(step, segment);
              propagator.propagate(propagator.getMinDate(), propagator.getMaxDate());
  
              final byte[]    bytes1            = buffer.toString().getBytes(StandardCharsets.UTF_8);
              final DataSource source1           = new DataSource("buffer", () -> new ByteArrayInputStream(bytes1));
              final CPF   generatedCpfFile1 = new CPFParser().parse(source1);
              CPFWriterTest.compareCpfFiles(cpfFile, generatedCpfFile1);
  
              // check calling the methods directly
              buffer = new StringBuilder();
              writer = new StreamingCpfWriter(buffer, utc, cpfFile.getHeader());
              writer.writeHeader();
              segment = writer.newSegment(frame);
              for (TimeStampedPVCoordinates coordinate : satellite.getCoordinates()) {
                  segment.writeEphemerisLine(coordinate);
              }
              writer.writeEndOfFile();
  
              // verify
              final byte[]    bytes2            = buffer.toString().getBytes(StandardCharsets.UTF_8);
              final DataSource source2           = new DataSource("buffer", () -> new ByteArrayInputStream(bytes2));
              final CPF   generatedCpfFile2 = new CPFParser().parse(source2);
             CPFWriterTest.compareCpfFiles(cpfFile, generatedCpfFile2);
 
         }
 
     }
 
 }