/*
    * 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.jgit.command.remoteinfo;
  
  import java.io.IOException;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.function.BiFunction;
  
  import org.apache.maven.scm.CommandParameters;
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.command.remoteinfo.AbstractRemoteInfoCommand;
  import org.apache.maven.scm.command.remoteinfo.RemoteInfoScmResult;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.git.command.GitCommand;
  import org.apache.maven.scm.provider.git.jgit.command.JGitTransportConfigCallback;
  import org.apache.maven.scm.provider.git.jgit.command.JGitUtils;
  import org.apache.maven.scm.provider.git.jgit.command.ScmProviderAwareSshdSessionFactory;
  import org.apache.maven.scm.provider.git.repository.GitScmProviderRepository;
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.api.LsRemoteCommand;
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.transport.CredentialsProvider;
  import org.slf4j.Logger;
  
  /**
   * @author Dominik Bartholdi (imod)
   * @since 1.9
   */
  public class JGitRemoteInfoCommand extends AbstractRemoteInfoCommand implements GitCommand {
  
      private BiFunction<GitScmProviderRepository, Logger, ScmProviderAwareSshdSessionFactory> sshSessionFactorySupplier;
  
      public JGitRemoteInfoCommand() {
          sshSessionFactorySupplier = ScmProviderAwareSshdSessionFactory::new;
      }
  
      public void setSshSessionFactorySupplier(
              BiFunction<GitScmProviderRepository, Logger, ScmProviderAwareSshdSessionFactory>
                      sshSessionFactorySupplier) {
          this.sshSessionFactorySupplier = sshSessionFactorySupplier;
      }
  
      @Override
      public RemoteInfoScmResult executeRemoteInfoCommand(
              ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters) throws ScmException {
  
          GitScmProviderRepository repo = (GitScmProviderRepository) repository;
          Git git = null;
          try {
              git = JGitUtils.openRepo(fileSet.getBasedir());
              CredentialsProvider credentials = JGitUtils.getCredentials(repo);
  
              LsRemoteCommand lsCommand = git.lsRemote()
                      .setRemote(repo.getPushUrl())
                      .setCredentialsProvider(credentials)
                      .setTransportConfigCallback(
                              new JGitTransportConfigCallback(sshSessionFactorySupplier.apply(repo, logger)));
  
              Map<String, String> tag = new HashMap<>();
              Collection<Ref> allTags = lsCommand.setHeads(false).setTags(true).call();
              for (Ref ref : allTags) {
                  tag.put(
                          Repository.shortenRefName(ref.getName()),
                          ref.getObjectId().name());
              }
  
              Map<String, String> heads = new HashMap<>();
              Collection<Ref> allHeads = lsCommand.setHeads(true).setTags(false).call();
              for (Ref ref : allHeads) {
                  heads.put(
                          Repository.shortenRefName(ref.getName()),
                          ref.getObjectId().name());
              }
  
              return new RemoteInfoScmResult("JGit remoteinfo", heads, tag);
          } catch (IOException | GitAPIException e) {
              throw new ScmException("JGit remoteinfo failure!", e);
          } finally {
             JGitUtils.closeRepo(git);
         }
     }
 }