/*
    * 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.impl;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.*;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.StandardCopyOption;
  
  import org.eclipse.aether.spi.io.PathProcessor;
  import org.eclipse.aether.util.FileUtils;
  
  /**
   * A utility class helping with file-based operations.
   */
  @Singleton
  @Named
  public class DefaultPathProcessor implements PathProcessor {
      @Override
      public void write(Path target, String data) throws IOException {
          FileUtils.writeFile(target, p -> Files.write(p, data.getBytes(StandardCharsets.UTF_8)));
      }
  
      @Override
      public void write(Path target, InputStream source) throws IOException {
          FileUtils.writeFile(target, p -> Files.copy(source, p, StandardCopyOption.REPLACE_EXISTING));
      }
  
      @Override
      public void copy(Path source, Path target) throws IOException {
          copy(source, target, null);
      }
  
      @Override
      public long copy(Path source, Path target, ProgressListener listener) throws IOException {
          try (InputStream in = new BufferedInputStream(Files.newInputStream(source));
                  FileUtils.CollocatedTempFile tempTarget = FileUtils.newTempFile(target);
                  OutputStream out = new BufferedOutputStream(Files.newOutputStream(tempTarget.getPath()))) {
              long result = copy(out, in, listener);
              tempTarget.move();
              return result;
          }
      }
  
      private long copy(OutputStream os, InputStream is, ProgressListener listener) throws IOException {
          long total = 0L;
          byte[] buffer = new byte[1024 * 32];
          while (true) {
              int bytes = is.read(buffer);
              if (bytes < 0) {
                  break;
              }
  
              os.write(buffer, 0, bytes);
  
              total += bytes;
  
              if (listener != null && bytes > 0) {
                  try {
                      listener.progressed(ByteBuffer.wrap(buffer, 0, bytes));
                  } catch (Exception e) {
                      // too bad
                  }
              }
          }
  
          return total;
      }
  
      @Override
      public void move(Path source, Path target) throws IOException {
          Files.move(source, target, StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.COPY_ATTRIBUTES);
      }
  }