/*
    * 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.InputStream;
  import java.io.OutputStream;
  import java.nio.Buffer;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  
  import org.eclipse.aether.spi.io.FileProcessor;
  
  /**
   * A simple file processor implementation to help satisfy component requirements during tests.
   */
  public class TestFileProcessor implements FileProcessor {
  
      public 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 void write(File file, String data) throws IOException {
          mkdirs(file.getParentFile());
  
          try (FileOutputStream fos = new FileOutputStream(file)) {
              if (data != null) {
                  fos.write(data.getBytes(StandardCharsets.UTF_8));
              }
          }
      }
  
      public void write(File target, InputStream source) throws IOException {
          mkdirs(target.getAbsoluteFile().getParentFile());
  
          try (OutputStream fos = new BufferedOutputStream(new FileOutputStream(target))) {
              copy(fos, source, null);
          }
      }
  
      public void copy(File source, File target) throws IOException {
          copy(source, target, null);
      }
  
      public long copy(File source, File target, ProgressListener listener) throws IOException {
          long total = 0;
  
          mkdirs(target.getAbsoluteFile().getParentFile());
  
          try (InputStream fis = new FileInputStream(source);
                  OutputStream fos = new BufferedOutputStream(new FileOutputStream(target))) {
              total = copy(fos, fis, listener);
          }
  
          return total;
      }
  
      private long copy(OutputStream os, InputStream is, ProgressListener listener) throws IOException {
          long total = 0L;
 
         ByteBuffer buffer = ByteBuffer.allocate(1024 * 32);
         byte[] array = buffer.array();
 
         while (true) {
             int bytes = is.read(array);
             if (bytes < 0) {
                 break;
             }
 
             os.write(array, 0, bytes);
 
             total += bytes;
 
             if (listener != null && bytes > 0) {
                 try {
                     ((Buffer) buffer).rewind();
                     ((Buffer) buffer).limit(bytes);
                     listener.progressed(buffer);
                 } catch (Exception e) {
                     // too bad
                 }
             }
         }
 
         return total;
     }
 
     public void move(File source, File target) throws IOException {
         target.delete();
 
         if (!source.renameTo(target)) {
             copy(source, target);
 
             target.setLastModified(source.lastModified());
 
             source.delete();
         }
     }
 
     @Override
     public String readChecksum(final File checksumFile) throws IOException {
         return new String(Files.readAllBytes(checksumFile.toPath()), StandardCharsets.UTF_8);
     }
 
     @Override
     public void writeChecksum(final File checksumFile, final String checksum) throws IOException {
         write(checksumFile, checksum);
     }
 }