/*
    * 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.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.function.BiPredicate;
  
  import org.apache.commons.lang3.tuple.Pair;
  import org.junit.jupiter.api.Test;
  
  public class CountingPredicateTest {
  
      private Integer[] ary = {Integer.valueOf(1), Integer.valueOf(2)};
  
      private BiPredicate<Integer, Integer> makeFunc(BiPredicate<Integer, Integer> inner, List<Pair<Integer, Integer>> result) {
          return (x, y) -> {
              if (inner.test(x, y)) {
                  result.add(Pair.of(x, y));
                  return true;
              }
              return false;
          };
      }
  
      /**
       * Test when the predicate array is longer than other array as determined by the number
       * of times cp.test() is called and all other values result in a true statement.
       */
      @Test
      public void testPredicateLonger() {
          List<Pair<Integer, Integer>> expected = new ArrayList<>();
          List<Pair<Integer, Integer>> result = new ArrayList<>();
          expected.add(Pair.of(1, 3));
  
          CountingPredicate<Integer> cp = new CountingPredicate<>(ary, makeFunc((x, y) -> x!=null, result));
          assertTrue(cp.test(Integer.valueOf(3)));
          assertEquals(expected, result);
          expected.add(Pair.of(2, null));
          assertTrue(cp.forEachRemaining());
          assertEquals(expected, result);
  
          // if the other array is zero length then cp.test() will not be called so
          // we can just call cp.forEachRemaining() here.
          expected.clear();
          expected.add(Pair.of(1, null));
          expected.add(Pair.of(2, null));
          result.clear();
          cp = new CountingPredicate<>(ary, makeFunc((x, y) -> x!=null, result));
          assertTrue(cp.forEachRemaining());
          assertEquals( expected, result);
  
          // If a test fails then the result should be false and the rest of the list should
          // not be processed.
          expected.clear();
          expected.add(Pair.of(1, null));
          result.clear();
          cp = new CountingPredicate<>(ary,  makeFunc((x, y) -> x == Integer.valueOf(1), result));
          assertFalse(cp.forEachRemaining());
          assertEquals(expected, result);
      }
  
      /**
       * Test when the predicate array is shorter than other array as determined by the number
       * of times cp.test() is called and all other values result in a true statement.
       */
      @Test
      public void testPredicateSameLength() {
          List<Pair<Integer, Integer>> expected = new ArrayList<>();
          List<Pair<Integer, Integer>> result = new ArrayList<>();
          expected.add( Pair.of(1, 3));
          expected.add( Pair.of(2, 3));
          CountingPredicate<Integer> cp = new CountingPredicate<>(ary, makeFunc((x, y) -> true, result));
          assertTrue(cp.test(3));
          assertTrue(cp.test(3));
          assertEquals(expected, result);
          assertTrue(cp.forEachRemaining());
          assertEquals(expected, result);
      }
  
      /**
      * Test when the predicate array is shorter than other array as determined by the number
      * of times cp.test() is called and all other values result in a true statement.
      */
     @Test
     public void testPredicateShorter() {
         List<Pair<Integer, Integer>> expected = new ArrayList<>();
         List<Pair<Integer, Integer>> result = new ArrayList<>();
         Integer[] shortAry = {Integer.valueOf(3)};
         expected.add(Pair.of(3, 1));
         expected.add(Pair.of(null, 2));
         CountingPredicate<Integer> cp = new CountingPredicate<>(shortAry, makeFunc((x, y) -> true, result));
         for (Integer i : ary) {
             assertTrue(cp.test(i));
         }
         assertEquals(expected, result);
         assertTrue(cp.forEachRemaining());
         assertEquals(expected, result);
     }
 }