/*
    * 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
    *
    *      https://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.io.function;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  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.io.IOException;
  import java.io.UncheckedIOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.function.Predicate;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.function.Executable;
  
  /**
   * Tests {@link IOPredicate}.
   */
  class IOPredicateTest {
  
      /** Files::isHidden throws IOException. */
      private static final IOPredicate<Path> IS_HIDDEN = Files::isHidden;
  
      private static final Path PATH_FIXTURE = Paths.get("src/test/resources/org/apache/commons/io/abitmorethan16k.txt");
  
      private static final Object THROWING_EQUALS = new Object() {
          @Override
          public boolean equals(final Object obj) {
              throw Erase.rethrow(new IOException("Expected"));
          }
          @Override
          public int hashCode() {
              // Pair implementation with equals() even though not strictly necessary.
              return super.hashCode();
          }
      };
  
      private static final Predicate<Object> THROWING_UNCHECKED_PREDICATE = TestConstants.THROWING_IO_PREDICATE.asPredicate();
  
      private void assertThrowsChecked(final Executable executable) {
          assertThrows(IOException.class, executable);
      }
  
      private void assertThrowsUnchecked(final Executable executable) {
          assertThrows(UncheckedIOException.class, executable);
      }
  
      @Test
      void testAndChecked() throws IOException {
          assertFalse(IS_HIDDEN.and(IS_HIDDEN).test(PATH_FIXTURE));
          assertTrue(IOPredicate.alwaysTrue().and(IOPredicate.alwaysTrue()).test(PATH_FIXTURE));
          assertFalse(IOPredicate.alwaysFalse().and(IOPredicate.alwaysTrue()).test(PATH_FIXTURE));
          assertFalse(IOPredicate.alwaysTrue().and(IOPredicate.alwaysFalse()).test(PATH_FIXTURE));
          assertFalse(IOPredicate.alwaysFalse().and(IOPredicate.alwaysFalse()).test(PATH_FIXTURE));
      }
  
      @Test
      void testAndUnchecked() {
          assertThrowsUnchecked(() -> THROWING_UNCHECKED_PREDICATE.and(THROWING_UNCHECKED_PREDICATE).test(PATH_FIXTURE));
      }
  
      @Test
      void testAsPredicate() throws IOException {
          new ArrayList<>().removeIf(THROWING_UNCHECKED_PREDICATE);
          final List<String> list = new ArrayList<>();
          list.add("A");
          list.add("B");
          list.removeIf(Predicate.isEqual("A"));
          assertFalse(list.contains("A"));
          list.removeIf(IOPredicate.isEqual("B").asPredicate());
          assertFalse(list.contains("B"));
          assertFalse(IS_HIDDEN.test(PATH_FIXTURE));
      }
  
      @Test
      void testFalse() throws IOException {
          assertFalse(Constants.IO_PREDICATE_FALSE.test("A"));
         // Make sure we keep the argument type
         final IOPredicate<String> alwaysFalse = IOPredicate.alwaysFalse();
         assertFalse(alwaysFalse.test("A"));
         assertEquals(IOPredicate.alwaysFalse(), IOPredicate.alwaysFalse());
         assertSame(IOPredicate.alwaysFalse(), IOPredicate.alwaysFalse());
     }
 
     @Test
     void testIsEqualChecked() throws IOException {
         assertThrowsChecked(() -> IOPredicate.isEqual(THROWING_EQUALS).test("B"));
         assertFalse(IOPredicate.isEqual(null).test("A"));
         assertTrue(IOPredicate.isEqual("B").test("B"));
         assertFalse(IOPredicate.isEqual("A").test("B"));
         assertFalse(IOPredicate.isEqual("B").test("A"));
     }
 
     @Test
     void testIsEqualUnchecked() {
         assertThrowsUnchecked(() -> IOPredicate.isEqual(THROWING_EQUALS).asPredicate().test("B"));
         assertFalse(IOPredicate.isEqual(null).asPredicate().test("A"));
         assertTrue(IOPredicate.isEqual("B").asPredicate().test("B"));
         assertFalse(IOPredicate.isEqual("A").asPredicate().test("B"));
         assertFalse(IOPredicate.isEqual("B").asPredicate().test("A"));
     }
 
     @Test
     void testNegateChecked() throws IOException {
         assertTrue(IS_HIDDEN.negate().test(PATH_FIXTURE));
         assertFalse(IOPredicate.alwaysTrue().negate().test(PATH_FIXTURE));
     }
 
     @Test
     void testNegateUnchecked() {
         assertTrue(IS_HIDDEN.negate().asPredicate().test(PATH_FIXTURE));
         assertTrue(IS_HIDDEN.asPredicate().negate().test(PATH_FIXTURE));
         assertThrowsUnchecked(() -> THROWING_UNCHECKED_PREDICATE.negate().test(PATH_FIXTURE));
     }
 
     @Test
     void testOrChecked() throws IOException {
         assertFalse(IS_HIDDEN.or(IS_HIDDEN).test(PATH_FIXTURE));
         assertTrue(IOPredicate.alwaysTrue().or(IOPredicate.alwaysFalse()).test(PATH_FIXTURE));
         assertTrue(IOPredicate.alwaysFalse().or(IOPredicate.alwaysTrue()).test(PATH_FIXTURE));
     }
 
     @Test
     void testOrUnchecked() {
         assertFalse(IS_HIDDEN.asPredicate().or(e -> false).test(PATH_FIXTURE));
         assertThrowsUnchecked(() -> THROWING_UNCHECKED_PREDICATE.or(THROWING_UNCHECKED_PREDICATE).test(PATH_FIXTURE));
     }
 
     @Test
     void testTestChecked() throws IOException {
         assertThrowsChecked(() -> TestConstants.THROWING_IO_PREDICATE.test(null));
         assertTrue(Constants.IO_PREDICATE_TRUE.test("A"));
     }
 
     @Test
     void testTestUnchecked() {
         assertThrowsUnchecked(() -> THROWING_UNCHECKED_PREDICATE.test(null));
         assertTrue(Constants.IO_PREDICATE_TRUE.asPredicate().test("A"));
     }
 
     @Test
     void testTrue() throws IOException {
         assertTrue(Constants.IO_PREDICATE_TRUE.test("A"));
         // Make sure we keep the argument type
         final IOPredicate<String> alwaysTrue = IOPredicate.alwaysTrue();
         assertTrue(alwaysTrue.test("A"));
         assertEquals(IOPredicate.alwaysTrue(), IOPredicate.alwaysTrue());
         assertSame(IOPredicate.alwaysTrue(), IOPredicate.alwaysTrue());
     }
 
 }