/* 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.propagation.events;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.orekit.propagation.SpacecraftState;
  import org.orekit.propagation.events.handlers.EventHandler;
  import org.orekit.propagation.events.intervals.AdaptableInterval;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.TimeInterval;
  
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  class TimeIntervalDetectorTest {
  
      @Test
      void testGetter() {
          // GIVEN
          final AbsoluteDate startDate = AbsoluteDate.ARBITRARY_EPOCH;
          final TimeInterval interval = TimeInterval.of(startDate, startDate.shiftedBy(1.));
          final TimeIntervalDetector detector = new TimeIntervalDetector(mock(EventHandler.class), interval);
          // WHEN
          final TimeInterval actualInterval = detector.getTimeInterval();
          // THEN
          assertEquals(interval, actualInterval);
      }
  
      @Test
      void testDependsOnlyOnTime() {
          // GIVEN
          final AbsoluteDate startDate = AbsoluteDate.ARBITRARY_EPOCH;
          final TimeInterval interval = TimeInterval.of(startDate, startDate.shiftedBy(1.));
          final TimeIntervalDetector detector = new TimeIntervalDetector(mock(EventHandler.class), interval);
          // WHEN
          final boolean value = detector.dependsOnTimeOnly();
          // THEN
          Assertions.assertTrue(value);
      }
  
      @Test
      void testGValue() {
          // GIVEN
          final AbsoluteDate startDate = AbsoluteDate.ARBITRARY_EPOCH;
          final TimeInterval interval = TimeInterval.of(startDate, startDate.shiftedBy(1.));
          final TimeIntervalDetector detector = new TimeIntervalDetector(mock(EventHandler.class), interval);
          // WHEN & THEN
          final double expectedG = 0.;
          assertEquals(expectedG, detector.g(mockState(interval.getStartDate())));
          assertEquals(expectedG, detector.g(mockState(interval.getEndDate())));
      }
  
      @Test
      void testGSign() {
          // GIVEN
          final AbsoluteDate startDate = AbsoluteDate.ARBITRARY_EPOCH;
          final double dt = 1;
          final TimeInterval interval = TimeInterval.of(startDate, startDate.shiftedBy(dt));
          final TimeIntervalDetector detector = new TimeIntervalDetector(mock(EventHandler.class), interval);
          // WHEN & THEN
          assertTrue(detector.g(mockState(interval.getStartDate().shiftedBy(-dt))) < 0.);
          assertTrue(detector.g(mockState(interval.getStartDate().shiftedBy(dt / 2))) > 0.);
          assertTrue(detector.g(mockState(interval.getEndDate().shiftedBy(dt))) < 0.);
      }
  
      @Test
      void testCreate() {
          // GIVEN
          final AbsoluteDate startDate = AbsoluteDate.ARBITRARY_EPOCH;
          final TimeInterval interval = TimeInterval.of(startDate, startDate.shiftedBy(1));
          final TimeIntervalDetector detector = new TimeIntervalDetector(mock(EventHandler.class), interval);
          final EventDetectionSettings detectionSettings = new EventDetectionSettings(mock(AdaptableInterval.class),
                  1., 1);
          final EventHandler mockedHandler = mock();
          // WHEN
          final TimeIntervalDetector createdDetector = detector.create(detectionSettings, mockedHandler);
          // THEN
          assertEquals(detectionSettings, createdDetector.getDetectionSettings());
          assertEquals(mockedHandler, createdDetector.getHandler());
      }
  
      private static SpacecraftState mockState(final AbsoluteDate date) {
         final SpacecraftState state = mock();
         when(state.getDate()).thenReturn(date);
         return state;
     }
 }