/**
 * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. 3. Neither the name of SCM-Manager;
 * nor the names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */



package sonia.scm.plugin;

//~--- non-JDK imports --------------------------------------------------------

import com.google.common.base.Charsets;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.io.Files;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import sonia.scm.lifecycle.classloading.ClassLoaderLifeCycle;
import sonia.scm.util.IOUtil;

//~--- JDK imports ------------------------------------------------------------

import java.io.File;
import java.io.IOException;

import java.nio.file.Path;

import java.util.Set;

/**
 *
 * @author Sebastian Sdorra
 */
public final class PluginsInternal
{

  /**
   * the logger for PluginsInternal
   */
  private static final Logger logger =
    LoggerFactory.getLogger(PluginsInternal.class);

  //~--- constructors ---------------------------------------------------------

  /**
   * Constructs ...
   *
   */
  private PluginsInternal() {}

  //~--- methods --------------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param classLoader
   * @param directory
   *
   * @return
   *
   * @throws IOException
   */
  public static Set<PluginWrapper> collectPlugins(ClassLoaderLifeCycle classLoaderLifeCycle,
                                                  Path directory)
    throws IOException
  {
    PluginProcessor processor = new PluginProcessor(classLoaderLifeCycle, directory);

    return processor.collectPlugins(classLoaderLifeCycle.getBootstrapClassLoader());
  }

  /**
   * Method description
   *
   *
   * @param parent
   * @param plugin
   *
   * @return
   */
  public static File createPluginDirectory(File parent, Plugin plugin)
  {
    PluginInformation info = plugin.getInformation();

    return new File(parent, info.getName());
  }

  /**
   * Method description
   *
   *
   * @param archive
   * @param checksum
   * @param directory
   * @param checksumFile
   * @param core
   *
   * @throws IOException
   */
  public static void extract(SmpArchive archive, String checksum,
    File directory, File checksumFile, boolean core)
    throws IOException
  {
    if (directory.exists())
    {
      logger.debug("delete directory {} for plugin extraction",
        archive.getPlugin().getInformation().getName(false));
      IOUtil.delete(directory);
    }

    IOUtil.mkdirs(directory);

    logger.debug("extract plugin {}",
      archive.getPlugin().getInformation().getName(false));
    archive.extract(directory);
    Files.write(checksum, checksumFile, Charsets.UTF_8);

    if (core)
    {
      if (!new File(directory, PluginConstants.FILE_CORE).createNewFile())
      {
        throw new IOException("could not create core plugin marker");
      }
    }
  }

  /**
   * Method description
   *
   *
   * @param wrapped
   *
   * @return
   */
  public static Iterable<Plugin> unwrap(Iterable<PluginWrapper> wrapped)
  {
    return Iterables.transform(wrapped, new Unwrap());
  }

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param pluginDirectory
   *
   * @return
   */
  public static File getChecksumFile(File pluginDirectory)
  {
    return new File(pluginDirectory, PluginConstants.FILE_CHECKSUM);
  }

  //~--- inner classes --------------------------------------------------------

  /**
   * Class description
   *
   *
   * @version        Enter version here..., 14/06/05
   * @author         Enter your name here...
   */
  private static class Unwrap implements Function<PluginWrapper, Plugin>
  {

    /**
     * Method description
     *
     *
     * @param wrapper
     *
     * @return
     */
    @Override
    public Plugin apply(PluginWrapper wrapper)
    {
      return wrapper.getPlugin();
    }
  }
}
