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/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Eclipse Public License version 1.0, available at
 * http://www.eclipse.org/legal/epl-v10.html
 */

package io.openshift.launchpad;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.function.Predicate;

/**
 * A {@link SimpleFileVisitor} implementation used to copy files from a directory {@link Path} to another directory.
 *
 * @author George Gastaldi
 */
public class CopyFileVisitor extends SimpleFileVisitor
{
   private final Path targetPath;
   private final Predicate filter;
   private Path sourcePath;

   public CopyFileVisitor(Path targetPath, Predicate filter)
   {
      this.targetPath = targetPath;
      this.filter = filter;
   }

   @Override
   public FileVisitResult preVisitDirectory(final Path dir,
            final BasicFileAttributes attrs) throws IOException
   {
      if (!filter.test(dir))
      {
         return FileVisitResult.SKIP_SUBTREE;
      }
      if (sourcePath == null)
      {
         sourcePath = dir;
      }
      else
      {
         Path target = targetPath.resolve(sourcePath.relativize(dir));
         java.nio.file.Files.createDirectories(target);
      }
      return FileVisitResult.CONTINUE;
   }

   @Override
   public FileVisitResult visitFile(final Path file,
            final BasicFileAttributes attrs) throws IOException
   {
      if (filter.test(file))
      {
         Path target = targetPath.resolve(sourcePath.relativize(file));
         java.nio.file.Files.copy(file, target, StandardCopyOption.REPLACE_EXISTING);
      }
      return FileVisitResult.CONTINUE;
   }
}