/* Copyright 2022-2025 Romain Serra
    * 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.forces.gravity.potential;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.orekit.time.AbsoluteDate;
  
  class UnnormalizedSphericalHarmonicsProviderTest {
  
      @Test
      void testGetUnnormalizedC20() {
          // GIVEN
          final double expectedC20 = 1.;
          final TestUnnormalizedProvider testUnnormalizedProvider = new TestUnnormalizedProvider(expectedC20);
          final AbsoluteDate date = AbsoluteDate.ARBITRARY_EPOCH;
          // WHEN
          final double actualC20 = testUnnormalizedProvider.getUnnormalizedC20(date);
          // THEN
          Assertions.assertEquals(expectedC20, actualC20, 0.);
      }
  
      private static class TestUnnormalizedProvider implements UnnormalizedSphericalHarmonicsProvider {
  
          private final double c20;
  
          TestUnnormalizedProvider(final double c20) {
              this.c20 = c20;
          }
  
          @Override
          public int getMaxDegree() {
              return 2;
          }
  
          @Override
          public int getMaxOrder() {
              return 0;
          }
  
          @Override
          public double getMu() {
              return 0;
          }
  
          @Override
          public double getAe() {
              return 0;
          }
  
          @Override
          public AbsoluteDate getReferenceDate() {
              return null;
          }
  
          @Override
          public TideSystem getTideSystem() {
              return null;
          }
  
          @Override
          public UnnormalizedSphericalHarmonics onDate(AbsoluteDate date) {
              return new UnnormalizedSphericalHarmonics() {
                  @Override
                  public double getUnnormalizedCnm(int n, int m) {
                      if ((n == 2) && (m == 0)) {
                          return c20;
                      }
                      return 0;
                  }
  
                  @Override
                  public double getUnnormalizedSnm(int n, int m) {
                      return 0;
                  }
  
                  @Override
                  public AbsoluteDate getDate() {
                      return null;
                  }
              };
          }
      }
  
  }