/*
    * 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.io.function;
  
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.LinkOption;
  import java.nio.file.Path;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.commons.io.file.PathUtils;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link IOBiFunction}.
   */
  public class IOBiFunctionTest {
  
      @SuppressWarnings("unused")
      private boolean not(final boolean value) throws IOException {
          return !value;
      }
  
      /**
       * Tests {@link IOBiFunction#andThen(IOFunction)}.
       *
       * @throws IOException thrown on test failure
       */
      @Test
      public void testAndThenIOFunction() throws IOException {
          final IOBiFunction<Path, LinkOption[], Boolean> isDirectory = Files::isDirectory;
          final IOFunction<Boolean, Boolean> not = this::not;
          assertTrue( isDirectory.apply(PathUtils.current(), PathUtils.EMPTY_LINK_OPTION_ARRAY));
          final IOBiFunction<Path, LinkOption[], Boolean> andThen = isDirectory.andThen(not);
          assertFalse(andThen.apply(PathUtils.current(), PathUtils.EMPTY_LINK_OPTION_ARRAY));
      }
  
      /**
       * Tests {@link IOBiFunction#apply(Object, Object)}.
       *
       * @throws IOException thrown on test failure
       */
      @Test
      public void testApply() throws IOException {
          final IOBiFunction<Path, LinkOption[], Boolean> isDirectory = Files::isDirectory;
          assertTrue( isDirectory.apply(PathUtils.current(), PathUtils.EMPTY_LINK_OPTION_ARRAY));
      }
  
      /**
       * Tests {@link IOBiFunction#apply(Object, Object)}.
       */
      @Test
      public void testApplyThrowsException() {
          final IOBiFunction<Path, LinkOption[], Boolean> isDirectory = (t, u) -> {
              throw new IOException("Boom!");
          };
          assertThrows(IOException.class, () -> isDirectory.apply(PathUtils.current(), PathUtils.EMPTY_LINK_OPTION_ARRAY));
      }
  
      @Test
      public void testAsBiFunction() {
          final Map<String, Long> map = new HashMap<>();
          map.put("1", 0L);
          final IOBiFunction<String, Long, Long> f = (t, u) -> Files.size(PathUtils.current());
          map.computeIfPresent("1", f.asBiFunction());
          assertNotEquals(0L, map.get("1"));
      }
  
  }