/*
    * 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.assertThrows;
  
  import org.junit.Test;
  
  /**
   * Test cases for file naming.
   * <p>
   * TODO - Add tests for all FileName methods.
   * </p>
   */
  public class NamingTests extends AbstractProviderTestCase {
  
      /**
       * Asserts that a particular relative name is invalid for a particular scope.
       */
      private void assertBadName(final FileName name, final String relName, final NameScope scope) {
          try {
              getManager().resolveName(name, relName, scope);
              fail("expected failure");
          } catch (final FileSystemException e) {
              // TODO - should check error message
          }
      }
  
      /**
       * Checks that a relative name resolves to the expected absolute path. Tests both forward and back slashes.
       */
      private void assertSameName(final String expectedPath, final FileName baseName, final String relName)
              throws Exception {
          assertSameName(expectedPath, baseName, relName, NameScope.FILE_SYSTEM);
      }
  
      /**
       * Checks that a relative name resolves to the expected absolute path. Tests both forward and back slashes.
       */
      private void assertSameName(final String expectedPath, final FileName baseName, final String relName,
              final NameScope scope) throws Exception {
          // Try the supplied name
          FileName name = getManager().resolveName(baseName, relName, scope);
          assertEquals(expectedPath, name.getPath());
  
          String temp;
  
          // Replace the separators
          temp = relName.replace('\\', '/');
          name = getManager().resolveName(baseName, temp, scope);
          assertEquals(expectedPath, name.getPath());
  
          // And again
          temp = relName.replace('/', '\\');
          name = getManager().resolveName(baseName, temp, scope);
          assertEquals(expectedPath, name.getPath());
      }
  
      /**
       * Tests resolution of absolute names.
       */
      private void checkAbsoluteNames(final FileName name) throws Exception {
          // Root
          assertSameName("/", name, "/");
          assertSameName("/", name, "//");
          assertSameName("/", name, "/.");
          assertSameName("/", name, "/some file/..");
  
          // Some absolute names
          assertSameName("/a", name, "/a");
          assertSameName("/a", name, "/./a");
          assertSameName("/a", name, "/a/.");
          assertSameName("/a/b", name, "/a/b");
  
          // Some bad names
          assertBadName(name, "/..", NameScope.FILE_SYSTEM);
          assertBadName(name, "/a/../..", NameScope.FILE_SYSTEM);
      }
  
      /**
       * Name resolution tests that are common for CHILD or DESCENDENT scope.
       */
      private void checkDescendentNames(final FileName name, final NameScope scope) throws Exception {
          // Make some assumptions about the name
          assertFalse(name.getPath().equals("/"));
         assertFalse(name.getPath().endsWith("/a"));
         assertFalse(name.getPath().endsWith("/a/b"));
 
         // Test names with the same prefix
         final String path = name.getPath() + "/a";
         assertSameName(path, name, path, scope);
         assertSameName(path, name, "../" + name.getBaseName() + "/a", scope);
         assertSameName(path, name, "./a", scope);
         assertSameName(path, name, "./a/foo/..", scope);
         assertSameName(path, name, "foo/../a", scope);
         assertSameName(path, name, "foo%2f..%2fa", scope);
         assertSameName(path, name, "foo%2f/..%2fa", scope);
         assertSameName(path, name, "foo/%2f..%2fa", scope);
 
         // Test an empty name
         assertBadName(name, "", scope);
 
         // Test . name
         assertBadName(name, ".", scope);
         assertBadName(name, "./", scope);
 
         // Test ancestor names
         assertBadName(name, "..", scope);
         assertBadName(name, "../a", scope);
         assertBadName(name, "../" + name.getBaseName() + "a", scope);
         assertBadName(name, "a/..", scope);
         assertBadName(name, "%2e%2e/ab", scope);
         assertBadName(name, "..%2f../ab", scope);
         assertBadName(name, "foo%2f..%2f..%2fa", scope);
         assertBadName(name, "foo%2f..%2f..%2fnone-child%2fa", scope);
 
         // Test absolute names
         assertBadName(name, "/", scope);
         assertBadName(name, "/a", scope);
         assertBadName(name, "/a/b", scope);
         assertBadName(name, name.getPath(), scope);
         assertBadName(name, name.getPath() + "a", scope);
     }
 
     /**
      * Tests conversion from absolute to relative names.
      */
     @Test
     public void testAbsoluteNameConvert() throws Exception {
         final FileName baseName = getReadFolder().getName();
 
         String path = "/test1/test2";
         FileName name = getManager().resolveName(baseName, path);
         assertEquals(path, name.getPath());
 
         // Try child and descendent names
         testRelName(name, "child");
         testRelName(name, "child1/child2");
 
         // Try own name
         testRelName(name, ".");
 
         // Try parent, and root
         testRelName(name, "..");
         testRelName(name, "../..");
 
         // Try sibling and descendent of sibling
         testRelName(name, "../sibling");
         testRelName(name, "../sibling/child");
 
         // Try siblings with similar names
         testRelName(name, "../test2_not");
         testRelName(name, "../test2_not/child");
         testRelName(name, "../test");
         testRelName(name, "../test/child");
 
         // Try unrelated
         testRelName(name, "../../unrelated");
         testRelName(name, "../../test");
         testRelName(name, "../../test/child");
 
         // Test against root
         path = "/";
         name = getManager().resolveName(baseName, path);
         assertEquals(path, name.getPath());
 
         // Try child and descendent names (against root)
         testRelName(name, "child");
         testRelName(name, "child1/child2");
 
         // Try own name (against root)
         testRelName(name, ".");
     }
 
     /**
      * Tests resolution of absolute names.
      */
     @Test
     public void testAbsoluteNames() throws Exception {
         // Test against the base folder
         FileName name = getReadFolder().getName();
         checkAbsoluteNames(name);
 
         // Test against the root
         name = getReadFolder().getFileSystem().getRoot().getName();
         checkAbsoluteNames(name);
 
         // Test against some unknown file
         name = getManager().resolveName(name, "a/b/unknown");
         checkAbsoluteNames(name);
     }
 
     /**
      * Tests child file names.
      */
     @Test
     public void testChildName() throws Exception {
         final FileName baseName = getReadFolder().getName();
         final String basePath = baseName.getPath();
         final FileName name = getManager().resolveName(baseName, "some-child", NameScope.CHILD);
 
         // Test path is absolute
         assertTrue("is absolute", basePath.startsWith("/"));
 
         // Test base name
         assertEquals("base name", "some-child", name.getBaseName());
 
         // Test absolute path
         assertEquals("absolute path", basePath + "/some-child", name.getPath());
 
         // Test parent path
         assertEquals("parent absolute path", basePath, name.getParent().getPath());
 
         // Try using a compound name to find a child
         assertBadName(name, "a/b", NameScope.CHILD);
 
         // Check other invalid names
         checkDescendentNames(name, NameScope.CHILD);
     }
 
     /**
      * Tests descendent name resolution.
      */
     @Test
     public void testDescendentName() throws Exception {
         final FileName baseName = getReadFolder().getName();
 
         // Test direct child
         String path = baseName.getPath() + "/some-child";
         assertSameName(path, baseName, "some-child", NameScope.DESCENDENT);
 
         // Test compound name
         path += "/grand-child";
         assertSameName(path, baseName, "some-child/grand-child", NameScope.DESCENDENT);
 
         // Test relative names
         assertSameName(path, baseName, "./some-child/grand-child", NameScope.DESCENDENT);
         assertSameName(path, baseName, "./nada/../some-child/grand-child", NameScope.DESCENDENT);
         assertSameName(path, baseName, "some-child/./grand-child", NameScope.DESCENDENT);
 
         // Test badly formed descendent names
         checkDescendentNames(baseName, NameScope.DESCENDENT);
     }
 
     /**
      * Tests relative name resolution, relative to the base folder.
      */
     @Test
     public void testNameResolution() throws Exception {
         final FileName baseName = getReadFolder().getName();
         final String parentPath = baseName.getParent().getPath();
         final String path = baseName.getPath();
         final String childPath = path + "/some-child";
 
         // Test empty relative path
         assertSameName(path, baseName, "");
 
         // Test . relative path
         assertSameName(path, baseName, ".");
 
         // Test ./ relative path
         assertSameName(path, baseName, "./");
 
         // Test .// relative path
         assertSameName(path, baseName, ".//");
 
         // Test .///.///. relative path
         assertSameName(path, baseName, ".///.///.");
         assertSameName(path, baseName, "./\\/.\\//.");
 
         // Test <elem>/.. relative path
         assertSameName(path, baseName, "a/..");
 
         // Test .. relative path
         assertSameName(parentPath, baseName, "..");
 
         // Test ../ relative path
         assertSameName(parentPath, baseName, "../");
 
         // Test ..//./ relative path
         assertSameName(parentPath, baseName, "..//./");
         assertSameName(parentPath, baseName, "..//.\\");
 
         // Test <elem>/../.. relative path
         assertSameName(parentPath, baseName, "a/../..");
 
         // Test <elem> relative path
         assertSameName(childPath, baseName, "some-child");
 
         // Test ./<elem> relative path
         assertSameName(childPath, baseName, "./some-child");
 
         // Test ./<elem>/ relative path
         assertSameName(childPath, baseName, "./some-child/");
 
         // Test <elem>/././././ relative path
         assertSameName(childPath, baseName, "./some-child/././././");
 
         // Test <elem>/../<elem> relative path
         assertSameName(childPath, baseName, "a/../some-child");
 
         // Test <elem>/<elem>/../../<elem> relative path
         assertSameName(childPath, baseName, "a/b/../../some-child");
     }
 
     /**
      * Tests resolution of relative file names via the FS manager.
      */
     @Test
     public void testRelativeURI() throws Exception {
         // Build base dir
         getManager().setBaseFile(getReadFolder());
 
         // Locate the base dir
         FileObject file = getManager().resolveFile(".");
         assertSame("file object", getReadFolder(), file);
 
         // Locate a child
         file = getManager().resolveFile("some-child");
         assertSame("file object", getReadFolder(), file.getParent());
 
         // Locate a descendent
         file = getManager().resolveFile("some-folder/some-file");
         assertSame("file object", getReadFolder(), file.getParent().getParent());
 
         // Locate parent
         file = getManager().resolveFile("..");
         assertSame("file object", getReadFolder().getParent(), file);
 
         // free basefile
         getManager().setBaseFile((FileObject) null);
     }
 
     /**
      * Tests encoding of relative URI.
      */
     @Test
     public void testRelativeUriEncoding() throws Exception {
         // Build base dir
         getManager().setBaseFile(getReadFolder());
         final String path = getReadFolder().getName().getPath();
 
         // §1 Encode "some file"
         FileObject file = getManager().resolveFile("%73%6f%6d%65%20%66%69%6c%65");
         assertEquals(path + "/some file", file.getName().getPathDecoded());
 
         // §2 Encode "."
         file = getManager().resolveFile("%2e");
         // 18-6-2005 imario@apache.org: no need to keep the "current directory"
         // assertEquals(path + "/.", file.getName().getPathDecoded());
         assertEquals(path, file.getName().getPathDecoded());
 
         // §3 Encode '%'
         file = getManager().resolveFile("a%25");
         assertEquals(path + "/a%", file.getName().getPathDecoded());
 
         // §4 Encode /
         file = getManager().resolveFile("dir%2fchild");
         assertEquals(path + "/dir/child", file.getName().getPathDecoded());
 
         // §5 Encode \
         file = getManager().resolveFile("dir%5cchild");
         // 18-6-2005 imario@apache.org: all file separators normalized to "/"
         // decided to do this to get the same behavior as in §4 on Windows
         // platforms
         // assertEquals(path + "/dir\\child", file.getName().getPathDecoded());
         assertEquals(path + "/dir/child", file.getName().getPathDecoded());
 
         // §6 Use "%" literal
         assertThrows(FileSystemException.class, () -> getManager().resolveFile("%"));
 
         // §7 Not enough digits in encoded char
         assertThrows(FileSystemException.class, () -> getManager().resolveFile("%5"));
 
         // §8 Invalid digit in encoded char
         assertThrows(FileSystemException.class, () -> getManager().resolveFile("%q"));
 
         // free basefile
         getManager().setBaseFile((FileObject) null);
     }
 
     /**
      * Checks that a file name converts to an expected relative path
      */
     private void testRelName(final FileName baseName, final String relPath) throws Exception {
         final FileName expectedName = getManager().resolveName(baseName, relPath);
 
         // Convert to relative path, and check
         final String actualRelPath = baseName.getRelativeName(expectedName);
         assertEquals(relPath, actualRelPath);
     }
 
     /**
      * Tests the root file name.
      */
     @Test
     public void testRootFileName() throws Exception {
         // Locate the root file
         final FileName rootName = getReadFolder().getFileSystem().getRoot().getName();
 
         // Test that the root path is "/"
         assertEquals("root path", "/", rootName.getPath());
 
         // Test that the root base name is ""
         assertEquals("root base name", "", rootName.getBaseName());
 
         // Test that the root name has no parent
         assertNull("root parent", rootName.getParent());
     }
 
 }