/*
    * 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.BufferedInputStream;
  import java.io.BufferedOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.AccessDeniedException;
  import java.nio.file.FileSystemException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.StandardCopyOption;
  import java.nio.file.attribute.FileTime;
  
  import org.eclipse.aether.spi.io.PathProcessor;
  import org.eclipse.aether.util.FileUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A utility class helping with file-based operations.
   */
  @Singleton
  @Named
  public class DefaultPathProcessor implements PathProcessor {
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      @Override
      public void setLastModified(Path path, long value) throws IOException {
          try {
              Files.setLastModifiedTime(path, FileTime.fromMillis(value));
          } catch (FileSystemException e) {
              // MRESOLVER-536: Java uses generic FileSystemException for some weird cases,
              // but some subclasses like AccessDeniedEx should be re-thrown
              if (e instanceof AccessDeniedException) {
                  throw e;
              }
              logger.trace("Failed to set last modified date: {}", path, e);
          }
      }
  
      @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 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);
     }
 }