/* 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,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
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  package org.orekit.utils;
  
  import org.hipparchus.Field;
  import org.hipparchus.linear.FieldMatrix;
  import org.hipparchus.linear.MatrixUtils;
  import org.hipparchus.linear.RealMatrix;
  import org.hipparchus.util.Binary64;
  import org.hipparchus.util.Binary64Field;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.Test;
  import org.orekit.Utils;
  import org.orekit.frames.LOFType;
  import org.orekit.propagation.FieldStateCovariance;
  import org.orekit.propagation.StateCovariance;
  import org.orekit.time.AbsoluteDate;
  
  class FieldifierTest {
  
      final Field<Binary64> field = Binary64Field.getInstance();
  
      @BeforeAll
      static void setUp() {
          Utils.setDataRoot("regular-data");
      }
  
      @Test
      void testMatrix() {
          // GIVEN
          // Create fake matrix
          final RealMatrix m = MatrixUtils.createRealMatrix(new double[][] {
                  {  1.0,  2.0,  3.0 },
                  { -3.0, -2.0, -1.0 }
          });
  
          // WHEN
          final FieldMatrix<Binary64> fieldMatrix = Fieldifier.fieldify(field, m);
  
          // THEN
  
          // Assert matrix dimension
          Assertions.assertEquals(m.getRowDimension(),    fieldMatrix.getRowDimension());
          Assertions.assertEquals(m.getColumnDimension(), fieldMatrix.getColumnDimension());
  
          // Assert matrix elements
          for (int i = 0; i < m.getRowDimension(); ++i) {
              for (int j = 0; j < m.getColumnDimension(); ++j) {
                  Assertions.assertEquals(m.getEntry(i, j), fieldMatrix.getEntry(i, j).getReal());
              }
          }
  
      }
  
      @Test
      void testStateCovariance() {
          // GIVEN
          // Create fake covariance
          final RealMatrix rowVector = MatrixUtils.createRealMatrix(new double[][] {
                  {  1.0,  2.0,  3.0, -3.0, -2.0, -1.0 }
          });
          final StateCovariance stateCovariance =
                  new StateCovariance(rowVector.transposeMultiply(rowVector),
                                      AbsoluteDate.QZSS_EPOCH,
                                      LOFType.LVLH_CCSDS);
  
          // WHEN
          final FieldStateCovariance<Binary64> fieldStateCovariance =
                  Fieldifier.fieldify(field, stateCovariance);
  
          // THEN
  
          // Assert date
          Assertions.assertEquals(0.0,
                                  fieldStateCovariance.getDate().durationFrom(stateCovariance.getDate()).getReal(),
                            1.0e-15);
  
          // Assert matrix dimension
          final RealMatrix m = stateCovariance.getMatrix();
          final FieldMatrix<Binary64> fieldMatrix = fieldStateCovariance.getMatrix();
          Assertions.assertEquals(m.getRowDimension(),    fieldMatrix.getRowDimension());
          Assertions.assertEquals(m.getColumnDimension(), fieldMatrix.getColumnDimension());
  
         // Assert matrix elements
         for (int i = 0; i < m.getRowDimension(); ++i) {
             for (int j = 0; j < m.getColumnDimension(); ++j) {
                 Assertions.assertEquals(m.getEntry(i, j), fieldMatrix.getEntry(i, j).getReal());
             }
         }
 
         // Assert types
         Assertions.assertEquals(stateCovariance.getLOF(), fieldStateCovariance.getLOF());
 
     }
 
 }