/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF 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.apache.commons.collections4.bloomfilter;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.function.LongPredicate;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  public class IndexProducerTest {
  
      private static final class TestingBitMapProducer implements BitMapProducer {
          long[] values;
  
          TestingBitMapProducer(final long[] values) {
              this.values = values;
          }
  
          @Override
          public boolean forEachBitMap(final LongPredicate consumer) {
              for (final long l : values) {
                  if (!consumer.test(l)) {
                      return false;
                  }
              }
              return true;
          }
      }
  
      @Test
      public void fromBitMapProducerTest() {
          TestingBitMapProducer producer = new TestingBitMapProducer(new long[] {1L, 2L, 3L});
          IndexProducer underTest = IndexProducer.fromBitMapProducer(producer);
          List<Integer> lst = new ArrayList<>();
  
          underTest.forEachIndex(lst::add);
          assertEquals(4, lst.size());
          assertEquals(Integer.valueOf(0), lst.get(0));
          assertEquals(Integer.valueOf(1 + 64), lst.get(1));
          assertEquals(Integer.valueOf(0 + 128), lst.get(2));
          assertEquals(Integer.valueOf(1 + 128), lst.get(3));
  
          producer = new TestingBitMapProducer(new long[] {0xFFFFFFFFFFFFFFFFL});
          underTest = IndexProducer.fromBitMapProducer(producer);
          lst = new ArrayList<>();
  
          underTest.forEachIndex(lst::add);
  
          assertEquals(64, lst.size());
          for (int i = 0; i < 64; i++) {
              assertEquals(Integer.valueOf(i), lst.get(i));
          }
      }
  
      @ParameterizedTest
      @ValueSource(ints = {32, 33})
      void testAsIndexArray(final int n) {
          final IndexProducer ip = i -> {
              for (int j = 0; j < n; j++) {
                  // Always test index zero
                  i.test(0);
              }
              return true;
          };
          Assertions.assertArrayEquals(new int[n], ip.asIndexArray());
      }
  }