/*
    * 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.maven.scm.provider.git.gitexe.command.status;
  
  import java.net.URI;
  
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.command.status.AbstractStatusCommand;
  import org.apache.maven.scm.command.status.StatusScmResult;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.git.command.GitCommand;
  import org.apache.maven.scm.provider.git.gitexe.command.GitCommandLineUtils;
  import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.codehaus.plexus.util.cli.Commandline;
  import org.slf4j.Logger;
  
  /**
   * @author <a href="mailto:brett@apache.org">Brett Porter</a>
   */
  public class GitStatusCommand extends AbstractStatusCommand implements GitCommand {
      /**
       * {@inheritDoc}
       */
      protected StatusScmResult executeStatusCommand(ScmProviderRepository repo, ScmFileSet fileSet) throws ScmException {
          int exitCode;
          CommandLineUtils.StringStreamConsumer stderr;
  
          URI relativeRepositoryPath = getRelativeCWD(logger, fileSet);
  
          Commandline cl = createCommandLine((GitScmProviderRepository) repo, fileSet);
  
          GitStatusConsumer consumer = new GitStatusConsumer(fileSet.getBasedir(), relativeRepositoryPath, fileSet);
  
          stderr = new CommandLineUtils.StringStreamConsumer();
  
          exitCode = GitCommandLineUtils.execute(cl, consumer, stderr);
          if (exitCode != 0) {
              // git-status returns non-zero if nothing to do
              if (logger.isInfoEnabled()) {
                  logger.info("nothing added to commit but untracked files present (use \"git add\" to track)");
              }
          }
  
          return new StatusScmResult(cl.toString(), consumer.getChangedFiles());
      }
  
      // ----------------------------------------------------------------------
      //
      // ----------------------------------------------------------------------
  
      /**
       * Get the dir relative to the repository root.
       *
       * @param logger the caller command logger
       * @param fileSet in which subdir to execute
       * @return the relative URI
       * @throws ScmException if execute() fails
       */
      public static URI getRelativeCWD(Logger logger, ScmFileSet fileSet) throws ScmException {
          Commandline clRevparse = createRevparseShowPrefix(fileSet);
  
          CommandLineUtils.StringStreamConsumer stdout = new CommandLineUtils.StringStreamConsumer();
          CommandLineUtils.StringStreamConsumer stderr = new CommandLineUtils.StringStreamConsumer();
  
          URI relativeRepositoryPath = null;
  
          int exitCode = GitCommandLineUtils.execute(clRevparse, stdout, stderr);
          if (exitCode != 0) {
              // git-status returns non-zero if nothing to do
              if (logger.isInfoEnabled()) {
                  logger.info("Could not resolve prefix");
              }
          } else {
              relativeRepositoryPath =
                      GitStatusConsumer.uriFromPath(stdout.getOutput().trim());
          }
          return relativeRepositoryPath;
      }
  
      public static Commandline createCommandLine(GitScmProviderRepository repository, ScmFileSet fileSet) {
          Commandline cl = GitCommandLineUtils.getBaseGitCommandLine(fileSet.getBasedir(), "status");
         cl.addArguments(new String[] {"--porcelain", "."});
         return cl;
     }
 
     public static Commandline createRevparseShowPrefix(ScmFileSet fileSet) {
         Commandline cl = GitCommandLineUtils.getBaseGitCommandLine(fileSet.getBasedir(), "rev-parse");
         cl.addArguments(new String[] {"--show-prefix"});
         return cl;
     }
 }