/* 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
   * limitations under the License.
   */
  package org.orekit.propagation.events;
  
  import org.hamcrest.CoreMatchers;
  import org.hamcrest.MatcherAssert;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.time.AbsoluteDate;
  
  /**
   * Unit tests for {@link NegateDetector}.
   *
   * @author Evan Ward
   */
  class NegateDetectorTest {
  
      @Test
      void testInitBackward() {
          //setup
          final DateDetector dateDetector = new DateDetector();
          final NegateDetector negateDetector = new NegateDetector(dateDetector);
          final SpacecraftState state = Mockito.mock(SpacecraftState.class);
          Mockito.when(state.getDate()).thenReturn(AbsoluteDate.ARBITRARY_EPOCH);
  
          //action
          negateDetector.init(state, AbsoluteDate.PAST_INFINITY);
  
          //verify
          Assertions.assertEquals(dateDetector.isForward(), negateDetector.isForward());
      }
  
      @Test
      void testInitForward() {
          //setup
          final DateDetector dateDetector = new DateDetector();
          final NegateDetector negateDetector = new NegateDetector(dateDetector);
          final SpacecraftState state = Mockito.mock(SpacecraftState.class);
          Mockito.when(state.getDate()).thenReturn(AbsoluteDate.ARBITRARY_EPOCH);
  
          //action
          negateDetector.init(state, AbsoluteDate.FUTURE_INFINITY);
  
          //verify
          Assertions.assertEquals(dateDetector.isForward(), negateDetector.isForward());
      }
  
      @Test
      void testGetDetector() {
          //setup
          EventDetector expectedDetector = new DateDetector();
  
          //action
          NegateDetector detector = new NegateDetector(expectedDetector);
  
          //verify
          Assertions.assertEquals(expectedDetector, detector.getDetector());
          Assertions.assertEquals(expectedDetector, detector.getOriginal());
      }
  
      /**
       * check g function is negated.
       */
      @Test
      void testG() {
          //setup
          EventDetector a = Mockito.mock(EventDetector.class);
          Mockito.when(a.getDetectionSettings()).thenReturn(EventDetectionSettings.getDefaultEventDetectionSettings());
          NegateDetector detector = new NegateDetector(a);
          SpacecraftState s = Mockito.mock(SpacecraftState.class);
  
          // verify + to -
          Mockito.when(a.g(s)).thenReturn(1.0);
          MatcherAssert.assertThat(detector.g(s), CoreMatchers.is(-1.0));
          // verify - to +
          Mockito.when(a.g(s)).thenReturn(-1.0);
          MatcherAssert.assertThat(detector.g(s), CoreMatchers.is(1.0));
      }
  
      /** Check a with___ method. */
      @Test
      void testCreate() {
          //setup
         EventDetector a = Mockito.mock(EventDetector.class);
         Mockito.when(a.getDetectionSettings()).thenReturn(EventDetectionSettings.getDefaultEventDetectionSettings());
         NegateDetector detector = new NegateDetector(a);
 
         // action
         NegateDetector actual = detector.withMaxCheck(100);
 
         //verify
         MatcherAssert.assertThat(actual.getMaxCheckInterval().currentInterval(null, true), CoreMatchers.is(100.0));
         Assertions.assertSame(actual.getOriginal(), a);
     }
 }