/*
    * 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.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  import static org.junit.Assert.assertNotSame;
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.NoSuchElementException;
  import java.util.function.Consumer;
  import java.util.function.Predicate;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  public class LayerManagerTest {
  
      private Shape shape = Shape.fromKM(17, 72);
  
      @ParameterizedTest
      @ValueSource(ints = {4, 10, 2, 1})
      public void testAdvanceOnCount(int breakAt) {
          Predicate<LayerManager> underTest = LayerManager.ExtendCheck.advanceOnCount(breakAt);
          LayerManager layerManager = testingBuilder().build();
          for (int i = 0; i < breakAt - 1; i++) {
              assertFalse(underTest.test(layerManager), "at " + i);
              layerManager.getTarget().merge(TestingHashers.FROM1);
          }
          assertTrue(underTest.test(layerManager));
      }
  
      @Test
      public void testAdvanceOnCountInvalidArguments() {
          assertThrows(IllegalArgumentException.class, () -> LayerManager.ExtendCheck.advanceOnCount(0));
          assertThrows(IllegalArgumentException.class, () -> LayerManager.ExtendCheck.advanceOnCount(-1));
      }
  
      @Test
      public void testAdvanceOnPopulated() {
          Predicate<LayerManager> underTest = LayerManager.ExtendCheck.advanceOnPopulated();
          LayerManager layerManager = testingBuilder().build();
          assertFalse(underTest.test(layerManager));
          layerManager.getTarget().merge(TestingHashers.FROM1);
          assertTrue(underTest.test(layerManager));
      }
  
      @Test
      public void testAdvanceOnSaturation() {
          Double maxN = shape.estimateMaxN();
          int hashStart = 0;
          Predicate<LayerManager> underTest = LayerManager.ExtendCheck.advanceOnSaturation(maxN);
          LayerManager layerManager = testingBuilder().build();
          while (layerManager.getTarget().getShape().estimateN(layerManager.getTarget().cardinality()) < maxN) {
              assertFalse(underTest.test(layerManager));
              layerManager.getTarget().merge(new IncrementingHasher(hashStart, shape.getNumberOfHashFunctions()));
              hashStart+=shape.getNumberOfHashFunctions();
          }
          assertTrue(underTest.test(layerManager));
          assertThrows(IllegalArgumentException.class, () -> LayerManager.ExtendCheck.advanceOnSaturation(0));
          assertThrows(IllegalArgumentException.class, () -> LayerManager.ExtendCheck.advanceOnSaturation(-1));
      }
  
      @Test
      public void testBuilder() {
          LayerManager.Builder underTest = LayerManager.builder();
          NullPointerException npe = assertThrows(NullPointerException.class, () -> underTest.build());
          assertTrue(npe.getMessage().contains("Supplier must not be null"));
          underTest.setSupplier(() -> null).setCleanup(null);
          npe = assertThrows(NullPointerException.class, () -> underTest.build());
          assertTrue(npe.getMessage().contains("Cleanup must not be null"));
          underTest.setCleanup(x -> {
          }).setExtendCheck(null);
          npe = assertThrows(NullPointerException.class, () -> underTest.build());
          assertTrue(npe.getMessage().contains("ExtendCheck must not be null"));
  
         npe = assertThrows(NullPointerException.class, () -> LayerManager.builder().setSupplier(() -> null).build());
         assertTrue(npe.getMessage().contains("filterSupplier returned null."));
 
     }
 
     @Test
     public void testClear() {
         LayerManager underTest = LayerManager.builder().setSupplier(() -> new SimpleBloomFilter(shape)).build();
         underTest.getTarget().merge(TestingHashers.randomHasher());
         underTest.next();
         underTest.getTarget().merge(TestingHashers.randomHasher());
         underTest.next();
         underTest.getTarget().merge(TestingHashers.randomHasher());
         assertEquals(3, underTest.getDepth());
         underTest.clear();
         assertEquals(1, underTest.getDepth());
         assertEquals(0, underTest.getTarget().cardinality());
     }
 
     @Test
     public void testCopy() {
         LayerManager underTest = LayerManager.builder().setSupplier(() -> new SimpleBloomFilter(shape)).build();
         underTest.getTarget().merge(TestingHashers.randomHasher());
         underTest.next();
         underTest.getTarget().merge(TestingHashers.randomHasher());
         underTest.next();
         underTest.getTarget().merge(TestingHashers.randomHasher());
         assertEquals(3, underTest.getDepth());
 
         LayerManager copy = underTest.copy();
         assertNotSame(underTest, copy);
         // object equals not implemented
         assertNotEquals(underTest, copy);
 
         assertEquals(underTest.getDepth(), copy.getDepth());
         assertTrue(
                 underTest.forEachBloomFilterPair(copy, (x, y) -> Arrays.equals(x.asBitMapArray(), y.asBitMapArray())));
     }
 
     @Test
     public void testForEachBloomFilter() {
         LayerManager underTest = LayerManager.builder().setSupplier(() -> new SimpleBloomFilter(shape))
                 .setExtendCheck(LayerManager.ExtendCheck.advanceOnPopulated()).build();
 
         List<BloomFilter> lst = new ArrayList<>();
         for (int i = 0; i < 10; i++) {
             BloomFilter bf = new SimpleBloomFilter(shape);
             bf.merge(TestingHashers.randomHasher());
             lst.add(bf);
             underTest.getTarget().merge(bf);
         }
         List<BloomFilter> lst2 = new ArrayList<>();
         underTest.forEachBloomFilter(lst2::add);
         assertEquals(10, lst.size());
         assertEquals(10, lst2.size());
         for (int i = 0; i < lst.size(); i++) {
             assertArrayEquals(lst.get(i).asBitMapArray(), lst2.get(i).asBitMapArray());
         }
     }
 
     @Test
     public void testGet() {
         SimpleBloomFilter f = new SimpleBloomFilter(shape);
         LayerManager underTest = LayerManager.builder().setSupplier(() -> f).build();
         assertEquals(1, underTest.getDepth());
         assertSame(f, underTest.get(0));
         assertThrows(NoSuchElementException.class, () -> underTest.get(-1));
         assertThrows(NoSuchElementException.class, () -> underTest.get(1));
     }
 
     private LayerManager.Builder testingBuilder() {
         return LayerManager.builder().setSupplier(() -> new SimpleBloomFilter(shape));
     }
 
     @Test
     public void testNeverAdvance() {
         Predicate<LayerManager> underTest = LayerManager.ExtendCheck.neverAdvance();
         LayerManager layerManager = testingBuilder().build();
         assertFalse(underTest.test(layerManager));
         for (int i = 0; i < 10; i++) {
             layerManager.getTarget().merge(TestingHashers.randomHasher());
             assertFalse(underTest.test(layerManager));
         }
     }
 
     @Test
     public void testNextAndGetDepth() {
         LayerManager underTest = LayerManager.builder().setSupplier(() -> new SimpleBloomFilter(shape)).build();
         assertEquals(1, underTest.getDepth());
         underTest.getTarget().merge(TestingHashers.randomHasher());
         assertEquals(1, underTest.getDepth());
         underTest.next();
         assertEquals(2, underTest.getDepth());
     }
 
     @Test
     public void testNoCleanup() {
         Consumer<LinkedList<BloomFilter>> underTest = LayerManager.Cleanup.noCleanup();
         LinkedList<BloomFilter> list = new LinkedList<>();
         for (int i = 0; i < 20; i++) {
             assertEquals(i, list.size());
             list.add(new SimpleBloomFilter(shape));
             underTest.accept(list);
         }
     }
 
     @ParameterizedTest
     @ValueSource(ints = {5, 100, 2, 1})
     public void testOnMaxSize(int maxSize) {
         Consumer<LinkedList<BloomFilter>> underTest = LayerManager.Cleanup.onMaxSize(maxSize);
         LinkedList<BloomFilter> list = new LinkedList<>();
         for (int i = 0; i < maxSize; i++) {
             assertEquals(i, list.size());
             list.add(new SimpleBloomFilter(shape));
             underTest.accept(list);
         }
         assertEquals(maxSize, list.size());
 
         for (int i = 0; i < maxSize; i++) {
             list.add(new SimpleBloomFilter(shape));
             underTest.accept(list);
             assertEquals(maxSize, list.size());
         }
     }
 
     @Test
     public void testOnMaxSizeIllegalValues() {
         assertThrows(IllegalArgumentException.class, () -> LayerManager.Cleanup.onMaxSize(0));
         assertThrows(IllegalArgumentException.class, () -> LayerManager.Cleanup.onMaxSize(-1));
     }
 
     @Test
     public void testRemoveEmptyTarget() {
         Consumer<LinkedList<BloomFilter>> underTest = LayerManager.Cleanup.removeEmptyTarget();
         LinkedList<BloomFilter> list = new LinkedList<>();
 
         // removes an empty filter
         BloomFilter bf = new SimpleBloomFilter(shape);
         list.add(bf);
         assertEquals(bf, list.get(0));
         underTest.accept(list);
         assertTrue(list.isEmpty());
 
         // does not remove a populated filter.
         bf.merge(IndexProducer.fromIndexArray(1));
         list.add(bf);
         assertEquals(bf, list.get(0));
         underTest.accept(list);
         assertEquals(bf, list.get(0));
 
         // does not remove an empty filter followed by a populated filter.
         list.clear();
         list.add(new SimpleBloomFilter(shape));
         list.add(bf);
         assertEquals(2, list.size());
         underTest.accept(list);
         assertEquals(2, list.size());
 
         // does not remove multiple empty filters at the end of the list, just the last
         // one.
         list.clear();
         list.add(bf);
         list.add(new SimpleBloomFilter(shape));
         list.add(new SimpleBloomFilter(shape));
         assertEquals(3, list.size());
         underTest.accept(list);
         assertEquals(2, list.size());
         assertEquals(bf, list.get(0));
 
     }
 
     @Test
     public void testTarget() {
         boolean[] extendCheckCalled = { false };
         boolean[] cleanupCalled = { false };
         int[] supplierCount = { 0 };
         LayerManager underTest = LayerManager.builder().setSupplier(() -> {
             supplierCount[0]++;
             return new SimpleBloomFilter(shape);
         }).setExtendCheck(lm -> {
             extendCheckCalled[0] = true;
             return true;
         }).setCleanup(ll -> {
             cleanupCalled[0] = true;
         }).build();
         assertFalse(extendCheckCalled[0]);
         assertFalse(cleanupCalled[0]);
         assertEquals(1, supplierCount[0]);
         underTest.getTarget();
         assertTrue(extendCheckCalled[0]);
         assertTrue(cleanupCalled[0]);
         assertEquals(2, supplierCount[0]);
     }
 
 }