/*
    * 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.hg.command.branch;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.maven.scm.ScmBranchParameters;
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFile;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmFileStatus;
  import org.apache.maven.scm.ScmResult;
  import org.apache.maven.scm.command.Command;
  import org.apache.maven.scm.command.branch.AbstractBranchCommand;
  import org.apache.maven.scm.command.branch.BranchScmResult;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.hg.HgUtils;
  import org.apache.maven.scm.provider.hg.command.HgCommandConstants;
  import org.apache.maven.scm.provider.hg.command.HgConsumer;
  import org.apache.maven.scm.provider.hg.command.inventory.HgListConsumer;
  import org.apache.maven.scm.provider.hg.repository.HgScmProviderRepository;
  
  /**
   * Branch. Mercurial has weird branches. After a branch is created, it must be committed to the server, otherwise
   * the branch does not exist (yet) in the repository.
   *
   * @author Henning Schmiedehausen
   *
   */
  public class HgBranchCommand extends AbstractBranchCommand implements Command {
  
      protected ScmResult executeBranchCommand(
              ScmProviderRepository scmProviderRepository, ScmFileSet fileSet, String branch, String message)
              throws ScmException {
          return executeBranchCommand(scmProviderRepository, fileSet, branch, new ScmBranchParameters(message));
      }
  
      /**
       * {@inheritDoc}
       */
      protected ScmResult executeBranchCommand(
              ScmProviderRepository scmProviderRepository,
              ScmFileSet fileSet,
              String branch,
              ScmBranchParameters scmBranchParameters)
              throws ScmException {
  
          if (StringUtils.isBlank(branch)) {
              throw new ScmException("branch must be specified");
          }
  
          if (!fileSet.getFileList().isEmpty()) {
              throw new ScmException("This provider doesn't support branchging subsets of a directory");
          }
  
          File workingDir = fileSet.getBasedir();
  
          // build the command
          String[] branchCmd = new String[] {HgCommandConstants.BRANCH_CMD, branch};
  
          // keep the command about in string form for reporting
          HgConsumer branchConsumer = new HgConsumer() {
              public void doConsume(ScmFileStatus status, String trimmedLine) {
                  // noop
              }
          };
  
          ScmResult result = HgUtils.execute(branchConsumer, workingDir, branchCmd);
          HgScmProviderRepository repository = (HgScmProviderRepository) scmProviderRepository;
  
          if (!result.isSuccess()) {
              throw new ScmException("Error while executing command " + joinCmd(branchCmd));
          }
  
          // First commit.
          String[] commitCmd = new String[] {
              HgCommandConstants.COMMIT_CMD, HgCommandConstants.MESSAGE_OPTION, scmBranchParameters.getMessage()
          };
  
          result = HgUtils.execute(new HgConsumer(), workingDir, commitCmd);
 
         if (!result.isSuccess()) {
             throw new ScmException("Error while executing command " + joinCmd(commitCmd));
         }
 
         // now push, if we should.
 
         if (repository.isPushChanges()) {
             if (!repository.getURI().equals(fileSet.getBasedir().getAbsolutePath())) {
 
                 String[] pushCmd = new String[] {
                     HgCommandConstants.PUSH_CMD, HgCommandConstants.NEW_BRANCH_OPTION, repository.getURI()
                 };
 
                 result = HgUtils.execute(new HgConsumer(), fileSet.getBasedir(), pushCmd);
 
                 if (!result.isSuccess()) {
                     throw new ScmException("Error while executing command " + joinCmd(pushCmd));
                 }
             }
         }
 
         // do an inventory to return the files branched (all of them)
         String[] listCmd = new String[] {HgCommandConstants.INVENTORY_CMD};
         HgListConsumer listconsumer = new HgListConsumer();
 
         result = HgUtils.execute(listconsumer, fileSet.getBasedir(), listCmd);
 
         if (!result.isSuccess()) {
             throw new ScmException("Error while executing command " + joinCmd(listCmd));
         }
 
         List<ScmFile> files = listconsumer.getFiles();
         List<ScmFile> fileList = new ArrayList<>();
         for (ScmFile f : files) {
             fileList.add(new ScmFile(f.getPath(), ScmFileStatus.TAGGED));
         }
 
         return new BranchScmResult(fileList, result);
     }
 
     private String joinCmd(String[] cmd) {
         StringBuilder result = new StringBuilder();
         for (int i = 0; i < cmd.length; i++) {
             String s = cmd[i];
             result.append(s);
             if (i < cmd.length - 1) {
                 result.append(" ");
             }
         }
         return result.toString();
     }
 }