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/*
 * 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.apache.kalumet.utils;

import org.apache.commons.io.IOUtils;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileType;
import org.apache.kalumet.FileManipulator;
import org.apache.kalumet.ws.client.SimplifiedFileObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStream;
import java.util.Date;

/**
 * Utils to manipulate file (view, browse)
 */
public class FileUtils
{

  private final static transient Logger LOGGER = LoggerFactory.getLogger( FileUtils.class );

  /**
   * Wrapper method to read a file.
   *
   * @param path the file VFS path.
   * @return the file content.
   */
  public static String view( String path )
  {
    String content = null;
    InputStream stream = null;
    FileManipulator fileManipulator = null;
    try
    {
      // get a file manipulator instance
      fileManipulator = new FileManipulator();
      // get the file content
      stream = fileManipulator.read( path );
      // populate the content string
      content = IOUtils.toString( stream );
    }
    catch ( Exception e )
    {
      LOGGER.warn( "Can't view {}", path, e );
    }
    finally
    {
      if ( stream != null )
      {
        try
        {
          stream.close();
        }
        catch ( Exception e )
        {
          // nothing to do
        }
      }
      if ( fileManipulator != null )
      {
        fileManipulator.close();
      }
    }
    return content;
  }

  /**
   * Wrapper method to browse a path.
   *
   * @param path the path to browse.
   * @return the list of children.
   */
  public static SimplifiedFileObject[] browse( String path )
  {
    SimplifiedFileObject[] children = null;
    FileManipulator fileManipulator = null;
    try
    {
      // get a file manipulator instance
      fileManipulator = new FileManipulator();
      // get the path children
      FileObject[] fileObjects = fileManipulator.browse( path );
      children = new SimplifiedFileObject[fileObjects.length];
      for ( int i = 0; i < fileObjects.length; i++ )
      {
        SimplifiedFileObject file = new SimplifiedFileObject();
        file.setName( fileObjects[i].getName().getBaseName() );
        file.setPath( fileObjects[i].getName().getPath() );
        file.setFile( fileObjects[i].getType().equals( FileType.FILE ) );
        file.setLastModificationDate( new Date( fileObjects[i].getContent().getLastModifiedTime() ) );
        if ( fileObjects[i].getType().equals( FileType.FILE ) )
        {
          file.setSize( fileObjects[i].getContent().getSize() );
        }
        else
        {
          file.setSize( 0 );
        }
        children[i] = file;
      }
    }
    catch ( Exception e )
    {
      LOGGER.warn( "Can't browse {}", path, e );
    }
    finally
    {
      if ( fileManipulator != null )
      {
        fileManipulator.close();
      }
    }
    return children;
  }

}