/**
 * 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.web;

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

import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.transport.PostReceiveHook;
import org.eclipse.jgit.transport.ReceiveCommand;
import org.eclipse.jgit.transport.ReceivePack;

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

import sonia.scm.repository.GitRepositoryHandler;
import sonia.scm.repository.GitRepositoryHookEvent;
import sonia.scm.repository.RepositoryManager;
import sonia.scm.repository.RepositoryNotFoundException;

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

import java.io.File;

import java.util.Collection;

/**
 *
 * @author Sebastian Sdorra
 */
public class GitPostReceiveHook implements PostReceiveHook
{

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

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

  /**
   * Constructs ...
   *
   *
   * @param repositoryManager
   */
  public GitPostReceiveHook(RepositoryManager repositoryManager)
  {
    this.repositoryManager = repositoryManager;
  }

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

  /**
   * Method description
   *
   *
   * @param rpack
   * @param receiveCommands
   */
  @Override
  public void onPostReceive(ReceivePack rpack,
                            Collection<ReceiveCommand> receiveCommands)
  {
    try
    {
      for (ReceiveCommand rc : receiveCommands)
      {
        if (rc.getResult() == ReceiveCommand.Result.OK)
        {
          ObjectId newId = rc.getNewId();
          ObjectId oldId = null;

          if (isUpdateCommand(rc))
          {
            oldId = rc.getOldId();
          }

          File directory = rpack.getRepository().getDirectory();
          String repositoryName = directory.getName();
          GitRepositoryHookEvent e = new GitRepositoryHookEvent(directory,
                                       newId, oldId);

          repositoryManager.fireHookEvent(GitRepositoryHandler.TYPE_NAME,
                                          repositoryName, e);
        }
      }
    }
    catch (RepositoryNotFoundException ex)
    {
      logger.error("repository could not be found", ex);
    }
  }

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

  /**
   * Method description
   *
   *
   * @param rc
   *
   * @return
   */
  private boolean isUpdateCommand(ReceiveCommand rc)
  {
    return (rc.getType() == ReceiveCommand.Type.UPDATE)
           || (rc.getType() == ReceiveCommand.Type.UPDATE_NONFASTFORWARD);
  }

  //~--- fields ---------------------------------------------------------------

  /** Field description */
  private RepositoryManager repositoryManager;
}