content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed 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 com.google.android.exoplayer2.text.webvtt;
  
  import static com.google.android.exoplayer2.C.INDEX_UNSET;
  import static com.google.common.truth.Truth.assertThat;
  import static java.lang.Long.MAX_VALUE;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.text.Cue;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit test for {@link WebvttSubtitle}. */
  @RunWith(AndroidJUnit4.class)
  public class WebvttSubtitleTest {
  
    private static final String FIRST_SUBTITLE_STRING = "This is the first subtitle.";
    private static final String SECOND_SUBTITLE_STRING = "This is the second subtitle.";
  
    private static final WebvttSubtitle emptySubtitle = new WebvttSubtitle(Collections.emptyList());
  
    private static final WebvttSubtitle simpleSubtitle =
        new WebvttSubtitle(
            Arrays.asList(
                new WebvttCueInfo(
                    WebvttCueParser.newCueForText(FIRST_SUBTITLE_STRING),
                    /* startTimeUs= */ 1_000_000,
                    /* endTimeUs= */ 2_000_000),
                new WebvttCueInfo(
                    WebvttCueParser.newCueForText(SECOND_SUBTITLE_STRING),
                    /* startTimeUs= */ 3_000_000,
                    /* endTimeUs= */ 4_000_000)));
  
    private static final WebvttSubtitle overlappingSubtitle =
        new WebvttSubtitle(
            Arrays.asList(
                new WebvttCueInfo(
                    WebvttCueParser.newCueForText(FIRST_SUBTITLE_STRING),
                    /* startTimeUs= */ 1_000_000,
                    /* endTimeUs= */ 3_000_000),
                new WebvttCueInfo(
                    WebvttCueParser.newCueForText(SECOND_SUBTITLE_STRING),
                    /* startTimeUs= */ 2_000_000,
                    /* endTimeUs= */ 4_000_000)));
  
    private static final WebvttSubtitle nestedSubtitle =
        new WebvttSubtitle(
            Arrays.asList(
                new WebvttCueInfo(
                    WebvttCueParser.newCueForText(FIRST_SUBTITLE_STRING),
                    /* startTimeUs= */ 1_000_000,
                    /* endTimeUs= */ 4_000_000),
                new WebvttCueInfo(
                    WebvttCueParser.newCueForText(SECOND_SUBTITLE_STRING),
                    /* startTimeUs= */ 2_000_000,
                    /* endTimeUs= */ 3_000_000)));
  
    @Test
    public void eventCount() {
      assertThat(emptySubtitle.getEventTimeCount()).isEqualTo(0);
      assertThat(simpleSubtitle.getEventTimeCount()).isEqualTo(4);
      assertThat(overlappingSubtitle.getEventTimeCount()).isEqualTo(4);
      assertThat(nestedSubtitle.getEventTimeCount()).isEqualTo(4);
    }
  
    @Test
    public void simpleSubtitleEventTimes() {
      assertThat(simpleSubtitle.getEventTime(0)).isEqualTo(1_000_000);
      assertThat(simpleSubtitle.getEventTime(1)).isEqualTo(2_000_000);
      assertThat(simpleSubtitle.getEventTime(2)).isEqualTo(3_000_000);
      assertThat(simpleSubtitle.getEventTime(3)).isEqualTo(4_000_000);
    }
  
    @Test
    public void simpleSubtitleEventIndices() {
      // Test first event
      assertThat(simpleSubtitle.getNextEventTimeIndex(0)).isEqualTo(0);
      assertThat(simpleSubtitle.getNextEventTimeIndex(500_000)).isEqualTo(0);
      assertThat(simpleSubtitle.getNextEventTimeIndex(999_999)).isEqualTo(0);
  
      // Test second event
      assertThat(simpleSubtitle.getNextEventTimeIndex(1_000_000)).isEqualTo(1);
      assertThat(simpleSubtitle.getNextEventTimeIndex(1_500_000)).isEqualTo(1);
      assertThat(simpleSubtitle.getNextEventTimeIndex(1_999_999)).isEqualTo(1);
  
      // Test third event
      assertThat(simpleSubtitle.getNextEventTimeIndex(2_000_000)).isEqualTo(2);
      assertThat(simpleSubtitle.getNextEventTimeIndex(2_500_000)).isEqualTo(2);
      assertThat(simpleSubtitle.getNextEventTimeIndex(2_999_999)).isEqualTo(2);
  
      // Test fourth event
      assertThat(simpleSubtitle.getNextEventTimeIndex(3_000_000)).isEqualTo(3);
      assertThat(simpleSubtitle.getNextEventTimeIndex(3_500_000)).isEqualTo(3);
      assertThat(simpleSubtitle.getNextEventTimeIndex(3_999_999)).isEqualTo(3);
  
      // Test null event (i.e. look for events after the last event)
      assertThat(simpleSubtitle.getNextEventTimeIndex(4_000_000)).isEqualTo(INDEX_UNSET);
      assertThat(simpleSubtitle.getNextEventTimeIndex(4_500_000)).isEqualTo(INDEX_UNSET);
      assertThat(simpleSubtitle.getNextEventTimeIndex(MAX_VALUE)).isEqualTo(INDEX_UNSET);
    }
  
    @Test
    public void simpleSubtitleText() {
      // Test before first subtitle
      assertThat(simpleSubtitle.getCues(0)).isEmpty();
      assertThat(simpleSubtitle.getCues(500_000)).isEmpty();
      assertThat(simpleSubtitle.getCues(999_999)).isEmpty();
  
      // Test first subtitle
      assertThat(getCueTexts(simpleSubtitle.getCues(1_000_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(simpleSubtitle.getCues(1_500_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(simpleSubtitle.getCues(1_999_999)))
          .containsExactly(FIRST_SUBTITLE_STRING);
  
      // Test after first subtitle, before second subtitle
      assertThat(simpleSubtitle.getCues(2_000_000)).isEmpty();
      assertThat(simpleSubtitle.getCues(2_500_000)).isEmpty();
      assertThat(simpleSubtitle.getCues(2_999_999)).isEmpty();
  
      // Test second subtitle
      assertThat(getCueTexts(simpleSubtitle.getCues(3_000_000)))
          .containsExactly(SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(simpleSubtitle.getCues(3_500_000)))
          .containsExactly(SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(simpleSubtitle.getCues(3_999_999)))
          .containsExactly(SECOND_SUBTITLE_STRING);
  
      // Test after second subtitle
      assertThat(simpleSubtitle.getCues(4_000_000)).isEmpty();
      assertThat(simpleSubtitle.getCues(4_500_000)).isEmpty();
      assertThat(simpleSubtitle.getCues(Long.MAX_VALUE)).isEmpty();
    }
  
    @Test
    public void overlappingSubtitleEventTimes() {
      assertThat(overlappingSubtitle.getEventTime(0)).isEqualTo(1_000_000);
      assertThat(overlappingSubtitle.getEventTime(1)).isEqualTo(2_000_000);
      assertThat(overlappingSubtitle.getEventTime(2)).isEqualTo(3_000_000);
      assertThat(overlappingSubtitle.getEventTime(3)).isEqualTo(4_000_000);
    }
  
    @Test
    public void overlappingSubtitleEventIndices() {
      // Test first event
      assertThat(overlappingSubtitle.getNextEventTimeIndex(0)).isEqualTo(0);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(500_000)).isEqualTo(0);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(999_999)).isEqualTo(0);
  
      // Test second event
      assertThat(overlappingSubtitle.getNextEventTimeIndex(1_000_000)).isEqualTo(1);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(1_500_000)).isEqualTo(1);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(1_999_999)).isEqualTo(1);
  
      // Test third event
      assertThat(overlappingSubtitle.getNextEventTimeIndex(2_000_000)).isEqualTo(2);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(2_500_000)).isEqualTo(2);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(2_999_999)).isEqualTo(2);
  
      // Test fourth event
      assertThat(overlappingSubtitle.getNextEventTimeIndex(3_000_000)).isEqualTo(3);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(3_500_000)).isEqualTo(3);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(3_999_999)).isEqualTo(3);
  
      // Test null event (i.e. look for events after the last event)
      assertThat(overlappingSubtitle.getNextEventTimeIndex(4_000_000)).isEqualTo(INDEX_UNSET);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(4_500_000)).isEqualTo(INDEX_UNSET);
      assertThat(overlappingSubtitle.getNextEventTimeIndex(MAX_VALUE)).isEqualTo(INDEX_UNSET);
    }
  
    @Test
    public void overlappingSubtitleText() {
      // Test before first subtitle
      assertThat(overlappingSubtitle.getCues(0)).isEmpty();
      assertThat(overlappingSubtitle.getCues(500_000)).isEmpty();
      assertThat(overlappingSubtitle.getCues(999_999)).isEmpty();
  
      // Test first subtitle
      assertThat(getCueTexts(overlappingSubtitle.getCues(1_000_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(overlappingSubtitle.getCues(1_500_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(overlappingSubtitle.getCues(1_999_999)))
          .containsExactly(FIRST_SUBTITLE_STRING);
  
      // Test after first and second subtitle
      assertThat(getCueTexts(overlappingSubtitle.getCues(2_000_000)))
          .containsExactly(FIRST_SUBTITLE_STRING, SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(overlappingSubtitle.getCues(2_500_000)))
          .containsExactly(FIRST_SUBTITLE_STRING, SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(overlappingSubtitle.getCues(2_999_999)))
          .containsExactly(FIRST_SUBTITLE_STRING, SECOND_SUBTITLE_STRING);
  
      // Test second subtitle
      assertThat(getCueTexts(overlappingSubtitle.getCues(3_000_000)))
          .containsExactly(SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(overlappingSubtitle.getCues(3_500_000)))
          .containsExactly(SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(overlappingSubtitle.getCues(3_999_999)))
          .containsExactly(SECOND_SUBTITLE_STRING);
  
      // Test after second subtitle
      assertThat(overlappingSubtitle.getCues(4_000_000)).isEmpty();
      assertThat(overlappingSubtitle.getCues(4_500_000)).isEmpty();
      assertThat(overlappingSubtitle.getCues(Long.MAX_VALUE)).isEmpty();
    }
  
    @Test
    public void nestedSubtitleEventTimes() {
      assertThat(nestedSubtitle.getEventTime(0)).isEqualTo(1_000_000);
      assertThat(nestedSubtitle.getEventTime(1)).isEqualTo(2_000_000);
      assertThat(nestedSubtitle.getEventTime(2)).isEqualTo(3_000_000);
      assertThat(nestedSubtitle.getEventTime(3)).isEqualTo(4_000_000);
    }
  
    @Test
    public void nestedSubtitleEventIndices() {
      // Test first event
      assertThat(nestedSubtitle.getNextEventTimeIndex(0)).isEqualTo(0);
      assertThat(nestedSubtitle.getNextEventTimeIndex(500_000)).isEqualTo(0);
      assertThat(nestedSubtitle.getNextEventTimeIndex(999_999)).isEqualTo(0);
  
      // Test second event
      assertThat(nestedSubtitle.getNextEventTimeIndex(1_000_000)).isEqualTo(1);
      assertThat(nestedSubtitle.getNextEventTimeIndex(1_500_000)).isEqualTo(1);
      assertThat(nestedSubtitle.getNextEventTimeIndex(1_999_999)).isEqualTo(1);
  
      // Test third event
      assertThat(nestedSubtitle.getNextEventTimeIndex(2_000_000)).isEqualTo(2);
      assertThat(nestedSubtitle.getNextEventTimeIndex(2_500_000)).isEqualTo(2);
      assertThat(nestedSubtitle.getNextEventTimeIndex(2_999_999)).isEqualTo(2);
  
      // Test fourth event
      assertThat(nestedSubtitle.getNextEventTimeIndex(3_000_000)).isEqualTo(3);
      assertThat(nestedSubtitle.getNextEventTimeIndex(3_500_000)).isEqualTo(3);
      assertThat(nestedSubtitle.getNextEventTimeIndex(3_999_999)).isEqualTo(3);
  
      // Test null event (i.e. look for events after the last event)
      assertThat(nestedSubtitle.getNextEventTimeIndex(4_000_000)).isEqualTo(INDEX_UNSET);
      assertThat(nestedSubtitle.getNextEventTimeIndex(4_500_000)).isEqualTo(INDEX_UNSET);
      assertThat(nestedSubtitle.getNextEventTimeIndex(MAX_VALUE)).isEqualTo(INDEX_UNSET);
    }
  
    @Test
    public void nestedSubtitleText() {
      // Test before first subtitle
      assertThat(nestedSubtitle.getCues(0)).isEmpty();
      assertThat(nestedSubtitle.getCues(500_000)).isEmpty();
      assertThat(nestedSubtitle.getCues(999_999)).isEmpty();
  
      // Test first subtitle
      assertThat(getCueTexts(nestedSubtitle.getCues(1_000_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(nestedSubtitle.getCues(1_500_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(nestedSubtitle.getCues(1_999_999)))
          .containsExactly(FIRST_SUBTITLE_STRING);
  
      // Test after first and second subtitle
      assertThat(getCueTexts(nestedSubtitle.getCues(2_000_000)))
          .containsExactly(FIRST_SUBTITLE_STRING, SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(nestedSubtitle.getCues(2_500_000)))
          .containsExactly(FIRST_SUBTITLE_STRING, SECOND_SUBTITLE_STRING);
      assertThat(getCueTexts(nestedSubtitle.getCues(2_999_999)))
          .containsExactly(FIRST_SUBTITLE_STRING, SECOND_SUBTITLE_STRING);
  
      // Test first subtitle
      assertThat(getCueTexts(nestedSubtitle.getCues(3_000_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(nestedSubtitle.getCues(3_500_000)))
          .containsExactly(FIRST_SUBTITLE_STRING);
      assertThat(getCueTexts(nestedSubtitle.getCues(3_999_999)))
          .containsExactly(FIRST_SUBTITLE_STRING);
  
      // Test after second subtitle
      assertThat(nestedSubtitle.getCues(4_000_000)).isEmpty();
      assertThat(nestedSubtitle.getCues(4_500_000)).isEmpty();
      assertThat(nestedSubtitle.getCues(Long.MAX_VALUE)).isEmpty();
    }
  
    private static List<String> getCueTexts(List<Cue> cues) {
      List<String> cueTexts = new ArrayList<>();
      for (int i = 0; i < cues.size(); i++) {
        cueTexts.add(cues.get(i).text.toString());
      }
      return cueTexts;
    }
  }
  