/*
    * 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.eclipse.aether.internal.test.util;
  
  import java.io.BufferedOutputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.RandomAccessFile;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Properties;
  import java.util.UUID;
  
  /**
   * Provides utility methods to read and write (temporary) files.
   */
  public class TestFileUtils {
  
      private static final File TMP = new File(
              System.getProperty("java.io.tmpdir"),
              "aether-" + UUID.randomUUID().toString().substring(0, 8));
  
      static {
          Runtime.getRuntime().addShutdownHook(new Thread(() -> {
              try {
                  deleteFile(TMP);
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }));
      }
  
      private TestFileUtils() {
          // hide constructor
      }
  
      public static void deleteTempFiles() throws IOException {
          deleteFile(TMP);
      }
  
      public static void deleteFile(File file) throws IOException {
          if (file == null) {
              return;
          }
  
          Collection<File> undeletables = new ArrayList<>();
  
          delete(file, undeletables);
  
          if (!undeletables.isEmpty()) {
              throw new IOException("Failed to delete " + undeletables);
          }
      }
  
      private static void delete(File file, Collection<File> undeletables) {
          String[] children = file.list();
          if (children != null) {
              for (String child : children) {
                  delete(new File(file, child), undeletables);
              }
          }
  
          if (!del(file)) {
              undeletables.add(file.getAbsoluteFile());
          }
      }
  
      private static boolean del(File file) {
          for (int i = 0; i < 10; i++) {
              if (file.delete() || !file.exists()) {
                  return true;
              }
          }
          return false;
      }
  
      public static boolean mkdirs(File directory) {
          if (directory == null) {
             return false;
         }
 
         if (directory.exists()) {
             return false;
         }
         if (directory.mkdir()) {
             return true;
         }
 
         File canonDir = null;
         try {
             canonDir = directory.getCanonicalFile();
         } catch (IOException e) {
             return false;
         }
 
         File parentDir = canonDir.getParentFile();
         return (parentDir != null && (mkdirs(parentDir) || parentDir.exists()) && canonDir.mkdir());
     }
 
     public static File createTempFile(String contents) throws IOException {
         return createTempFile(contents.getBytes(StandardCharsets.UTF_8), 1);
     }
 
     public static File createTempFile(byte[] pattern, int repeat) throws IOException {
         mkdirs(TMP);
         File tmpFile = File.createTempFile("tmpfile-", ".data", TMP);
         writeBytes(tmpFile, pattern, repeat);
         return tmpFile;
     }
 
     /**
      * Creates a temporary directory.
      *
      * @return the temporary directory
      * @throws IOException if an I/O error occurs
      * @deprecated use @TempDir (JUnit 5} Or TemporaryFolder (JUnit 4) instead
      */
     @Deprecated
     public static File createTempDir() throws IOException {
         return createTempDir("");
     }
 
     /**
      * Creates a temporary directory.
      *
      * @return the temporary directory
      * @throws IOException if an I/O error occurs
      * @deprecated use {@code @TempDir) (JUnit 5} Or {@code TemporaryFolder} (JUnit 4) instead
      */
     @Deprecated
     public static File createTempDir(String suffix) throws IOException {
         mkdirs(TMP);
         File tmpFile = File.createTempFile("tmpdir-", suffix, TMP);
         deleteFile(tmpFile);
         mkdirs(tmpFile);
         return tmpFile;
     }
 
     public static long copyFile(File source, File target) throws IOException {
         long total = 0;
 
         FileInputStream fis = null;
         OutputStream fos = null;
         try {
             fis = new FileInputStream(source);
 
             mkdirs(target.getParentFile());
 
             fos = new BufferedOutputStream(new FileOutputStream(target));
 
             for (byte[] buffer = new byte[1024 * 32]; ; ) {
                 int bytes = fis.read(buffer);
                 if (bytes < 0) {
                     break;
                 }
 
                 fos.write(buffer, 0, bytes);
 
                 total += bytes;
             }
 
             fos.close();
             fos = null;
 
             fis.close();
             fis = null;
         } finally {
             try {
                 if (fos != null) {
                     fos.close();
                 }
             } catch (final IOException e) {
                 // Suppressed due to an exception already thrown in the try block.
             } finally {
                 try {
                     if (fis != null) {
                         fis.close();
                     }
                 } catch (final IOException e) {
                     // Suppressed due to an exception already thrown in the try block.
                 }
             }
         }
 
         return total;
     }
 
     /**
      * Reads the contents of a file into a byte array.
      *
      * @param file the file to read
      * @return the contents of the file as a byte array
      * @throws IOException if an I/O error occurs
      * @deprecated use {@code Files.readAllBytes(Path)} instead
      */
     @Deprecated
     public static byte[] readBytes(File file) throws IOException {
         RandomAccessFile in = null;
         try {
             in = new RandomAccessFile(file, "r");
             byte[] actual = new byte[(int) in.length()];
             in.readFully(actual);
             in.close();
             in = null;
             return actual;
         } finally {
             try {
                 if (in != null) {
                     in.close();
                 }
             } catch (final IOException e) {
                 // Suppressed due to an exception already thrown in the try block.
             }
         }
     }
 
     public static void writeBytes(File file, byte[] pattern, int repeat) throws IOException {
         file.deleteOnExit();
         file.getParentFile().mkdirs();
         OutputStream out = null;
         try {
             out = new BufferedOutputStream(new FileOutputStream(file));
             for (int i = 0; i < repeat; i++) {
                 out.write(pattern);
             }
             out.close();
             out = null;
         } finally {
             try {
                 if (out != null) {
                     out.close();
                 }
             } catch (final IOException e) {
                 // Suppressed due to an exception already thrown in the try block.
             }
         }
     }
 
     public static String readString(File file) throws IOException {
         byte[] content = Files.readAllBytes(file.toPath());
         return new String(content, StandardCharsets.UTF_8);
     }
 
     public static void writeString(File file, String content) throws IOException {
         writeBytes(file, content.getBytes(StandardCharsets.UTF_8), 1);
     }
 
     public static void writeString(File file, String content, long timestamp) throws IOException {
         writeBytes(file, content.getBytes(StandardCharsets.UTF_8), 1);
         file.setLastModified(timestamp);
     }
 
     public static void readProps(File file, Properties props) throws IOException {
         FileInputStream fis = null;
         try {
             fis = new FileInputStream(file);
             props.load(fis);
             fis.close();
             fis = null;
         } finally {
             try {
                 if (fis != null) {
                     fis.close();
                 }
             } catch (final IOException e) {
                 // Suppressed due to an exception already thrown in the try block.
             }
         }
     }
 
     public static void writeProps(File file, Properties props) throws IOException {
         file.getParentFile().mkdirs();
 
         FileOutputStream fos = null;
         try {
             fos = new FileOutputStream(file);
             props.store(fos, "aether-test");
             fos.close();
             fos = null;
         } finally {
             try {
                 if (fos != null) {
                     fos.close();
                 }
             } catch (final IOException e) {
                 // Suppressed due to an exception already thrown in the try block.
             }
         }
     }
 }