/*
    * 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.configuration2.reloading;
  
  import static org.apache.commons.configuration2.TempDirUtils.newFile;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  import static org.mockito.Mockito.when;
  
  import java.io.File;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.nio.file.Files;
  
  import org.apache.commons.configuration2.ConfigurationAssert;
  import org.apache.commons.configuration2.ex.ConfigurationRuntimeException;
  import org.apache.commons.configuration2.io.FileHandler;
  import org.apache.commons.configuration2.io.VFSFileSystem;
  import org.apache.commons.vfs2.FileName;
  import org.apache.commons.vfs2.FileObject;
  import org.apache.commons.vfs2.FileSystemException;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.io.TempDir;
  
  /**
   * Test case for the VFSFileHandlerReloadingDetector class.
   */
  public class TestVFSFileHandlerReloadingDetector {
      /** Constant for the name of the test property. */
      private static final String PROPERTY = "string";
  
      /** Constant for the XML fragment to be written. */
      private static final String FMT_XML = "<configuration><" + PROPERTY + ">%s</" + PROPERTY + "></configuration>";
  
      /** A folder for temporary files. */
      @TempDir
      public File tempFolder;
  
      /**
       * Tests whether the refresh delay is correctly passed to the base class.
       */
      @Test
      public void testGetRefreshDelay() throws Exception {
          final long delay = 20130325L;
          final VFSFileHandlerReloadingDetector strategy = new VFSFileHandlerReloadingDetector(null, delay);
          assertNotNull(strategy.getFileHandler());
          assertEquals(delay, strategy.getRefreshDelay());
      }
  
      /**
       * Tests whether the last modification date of an existing file can be obtained.
       */
      @Test
      public void testLastModificationDateExisting() throws IOException {
          final File file = newFile(tempFolder);
          writeTestFile(file, "value1");
          final VFSFileHandlerReloadingDetector strategy = new VFSFileHandlerReloadingDetector();
          strategy.getFileHandler().setFile(file);
          strategy.getFileHandler().setFileSystem(new VFSFileSystem());
          final long modificationDate = strategy.getLastModificationDate();
          // Workaround OpenJDK 8 and 9 bug JDK-8177809
          // https://bugs.openjdk.java.net/browse/JDK-8177809
          final long expectedMillis = Files.getLastModifiedTime(file.toPath()).toMillis();
          assertEquals(expectedMillis, modificationDate);
      }
  
      /**
       * Tests whether a file system exception is handled when accessing the file object.
       */
      @Test
      public void testLastModificationDateFileSystemEx() throws FileSystemException {
          final FileObject fo = mock(FileObject.class);
          final FileName name = mock(FileName.class);
  
          when(fo.exists()).thenReturn(Boolean.TRUE);
          when(fo.getContent()).thenThrow(new FileSystemException("error"));
          when(fo.getName()).thenReturn(name);
          when(name.getURI()).thenReturn("someURI");
  
          final VFSFileHandlerReloadingDetector strategy = new VFSFileHandlerReloadingDetector() {
             @Override
             protected FileObject getFileObject() {
                 return fo;
             }
         };
         assertEquals(0, strategy.getLastModificationDate());
 
         verify(fo).exists();
         verify(fo).getContent();
         verify(fo).getName();
         verify(name).getURI();
         verifyNoMoreInteractions(fo, name);
     }
 
     /**
      * Tests whether a non existing file is handled correctly.
      */
     @Test
     public void testLastModificationDateNonExisting() {
         final File file = ConfigurationAssert.getOutFile("NonExistingFile.xml");
         final FileHandler handler = new FileHandler();
         handler.setFileSystem(new VFSFileSystem());
         handler.setFile(file);
         final VFSFileHandlerReloadingDetector strategy = new VFSFileHandlerReloadingDetector(handler);
         assertEquals(0, strategy.getLastModificationDate());
     }
 
     /**
      * Tests whether an undefined file handler is handler correctly.
      */
     @Test
     public void testLastModificationDateUndefinedHandler() {
         final VFSFileHandlerReloadingDetector strategy = new VFSFileHandlerReloadingDetector();
         assertEquals(0, strategy.getLastModificationDate());
     }
 
     /**
      * Tests a URI which cannot be resolved.
      */
     @Test
     public void testLastModificationDateUnresolvableURI() {
         final VFSFileHandlerReloadingDetector strategy = new VFSFileHandlerReloadingDetector() {
             @Override
             protected String resolveFileURI() {
                 return null;
             }
         };
         strategy.getFileHandler().setFileSystem(new VFSFileSystem());
         strategy.getFileHandler().setFileName("test.xml");
         assertThrows(ConfigurationRuntimeException.class, strategy::getLastModificationDate);
     }
 
     /**
      * Writes a test configuration file containing a single property with the given value.
      *
      * @param file the file to be written
      * @param value the value of the test property
      * @throws IOException if an error occurs
      */
     private void writeTestFile(final File file, final String value) throws IOException {
         try (FileWriter out = new FileWriter(file)) {
             out.write(String.format(FMT_XML, value));
         }
     }
 }