/*
    * 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.vfs2;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Set;
  
  import org.junit.jupiter.api.AfterAll;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests FileExtensionSelector.
   */
  public class PatternFileSelectorTest {
  
      private static FileObject baseFolder;
  
      /**
       * 9 files and 1 directory = 10
       */
      private static final int ENTRY_COUNT = 10;
  
      private static final int EXTENSION_COUNT = 3;
  
      private static final int FILES_PER_EXTENSION_COUNT = 3;
  
      static FileObject getBaseFolder() {
          return baseFolder;
      }
  
      /**
       * Creates a RAM FS.
       *
       * @throws Exception
       */
      @BeforeAll
      public static void setUpClass() throws Exception {
          baseFolder = VFS.getManager().resolveFile("ram://" + PatternFileSelectorTest.class.getName());
          baseFolder.deleteAll();
          baseFolder.createFolder();
          baseFolder.resolveFile("aa.htm").createFile();
          baseFolder.resolveFile("aa.html").createFile();
          baseFolder.resolveFile("aa.xhtml").createFile();
          baseFolder.resolveFile("b.htm").createFile();
          baseFolder.resolveFile("b.html").createFile();
          baseFolder.resolveFile("b.xhtml").createFile();
          baseFolder.resolveFile("c.htm").createFile();
          baseFolder.resolveFile("c.html").createFile();
          baseFolder.resolveFile("c.xhtml").createFile();
      }
  
      /**
       * Deletes RAM FS files.
       *
       * @throws Exception
       */
      @AfterAll
      public static void tearDownClass() throws Exception {
          if (baseFolder != null) {
              baseFolder.deleteAll();
          }
      }
  
      /**
       * Tests a one extension selector.
       *
       * @throws Exception
       */
      @Test
      public void testFileExtensions() throws Exception {
          final FileObject[] foArray = baseFolder.findFiles(Selectors.SELECT_FILES);
          assertTrue(foArray.length > 0);
          final String regExPrefix = ".*\\.";
          // gather file extensions.
          final Set<String> extensionSet = new HashSet<>();
          for (final FileObject fo : foArray) {
              extensionSet.add(regExPrefix + fo.getName().getExtension());
          }
          final String message = String.format("Extensions: %s; files: %s", extensionSet.toString(),
                 Arrays.asList(foArray).toString());
         assertEquals(EXTENSION_COUNT, extensionSet.size(), message);
         // check each extension
         for (final String extension : extensionSet) {
             final FileSelector selector = new PatternFileSelector(extension);
             final FileObject[] list = baseFolder.findFiles(selector);
             assertEquals(FILES_PER_EXTENSION_COUNT, list.length);
         }
         // check each file against itself
         for (final FileObject fo : foArray) {
             final FileSelector selector = new PatternFileSelector(regExPrefix + fo.getName().getExtension());
             final FileObject[] list = baseFolder.findFiles(selector);
             assertEquals(FILES_PER_EXTENSION_COUNT, list.length);
         }
     }
 
     /**
      * Tests matching all.
      *
      * @throws Exception
      */
     @Test
     public void testMatchAll() throws Exception {
         final FileObject[] list = baseFolder.findFiles(new PatternFileSelector(".*"));
         assertEquals(ENTRY_COUNT, list.length);
     }
 
     /**
      * Tests matching partial file names.
      *
      * @throws Exception
      */
     @Test
     public void testMatchPartial() throws Exception {
         final FileObject[] list = baseFolder.findFiles(new PatternFileSelector(".*a.htm"));
         assertEquals(1, list.length);
         assertEquals("aa.htm", list[0].getName().getBaseName());
     }
 
     /**
      * Tests matching partial file names with delimiter.
      *
      * @throws Exception
      */
     @Test
     public void testMatchPartialDelimited() throws Exception {
         final FileObject[] list = baseFolder.findFiles(new PatternFileSelector("^.*\\/b.htm$"));
         assertEquals(1, list.length);
         assertEquals("b.htm", list[0].getName().getBaseName());
     }
 
     /**
      * Tests a null selector.
      */
     @Test
     public void testNullString() {
         // Yep, this will blow up.
         assertThrows(NullPointerException.class, () -> new PatternFileSelector((String) null));
     }
 
 }