package org.apache.maven.scm.provider.hg;
   
   /*
    * 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.
   */
  
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmFileStatus;
  import org.apache.maven.scm.ScmResult;
  import org.apache.maven.scm.log.DefaultLog;
  import org.apache.maven.scm.log.ScmLogger;
  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.HgChangeSet;
  import org.apache.maven.scm.provider.hg.command.inventory.HgOutgoingConsumer;
  import org.codehaus.plexus.util.cli.CommandLineException;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.codehaus.plexus.util.cli.Commandline;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Common code for executing hg commands.
   *
   * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
   *
   */
  public final class HgUtils
  {
  
      private HgUtils()
      {
          // no op
      }
  
      /**
       * Map between command and its valid exit codes
       */
      private static final Map<String, List<Integer>> EXIT_CODE_MAP = new HashMap<String, List<Integer>>();
  
      /**
       * Default exit codes for entries not in exitCodeMap
       */
      private static final List<Integer> DEFAULT_EXIT_CODES = new ArrayList<Integer>();
  
      /** Setup exit codes*/
      static
      {
          DEFAULT_EXIT_CODES.add( Integer.valueOf( 0 ) );
  
          //Diff is different
          List<Integer> diffExitCodes = new ArrayList<Integer>( 3 );
          diffExitCodes.add( Integer.valueOf( 0 ) ); //No difference
          diffExitCodes.add( Integer.valueOf( 1 ) ); //Conflicts in merge-like or changes in diff-like
          diffExitCodes.add( Integer.valueOf( 2 ) ); //Unrepresentable diff changes
          EXIT_CODE_MAP.put( HgCommandConstants.DIFF_CMD, diffExitCodes );
          //Outgoing is different
          List<Integer> outgoingExitCodes = new ArrayList<Integer>( 2 );
          outgoingExitCodes.add( Integer.valueOf( 0 ) ); //There are changes
          outgoingExitCodes.add( Integer.valueOf( 1 ) ); //No changes
          EXIT_CODE_MAP.put( HgCommandConstants.OUTGOING_CMD, outgoingExitCodes );        
      }
  
      public static ScmResult execute( HgConsumer consumer, ScmLogger logger, File workingDir, String[] cmdAndArgs )
          throws ScmException
      {
          try
          {
              //Build commandline
              Commandline cmd = buildCmd( workingDir, cmdAndArgs );
              if ( logger.isInfoEnabled() )
              {
                  logger.info( "EXECUTING: " + maskPassword( cmd ) );
              }
  
              //Execute command
              int exitCode = executeCmd( consumer, cmd );
  
              //Return result
             List<Integer> exitCodes = DEFAULT_EXIT_CODES;
             if ( EXIT_CODE_MAP.containsKey( cmdAndArgs[0] ) )
             {
                 exitCodes = EXIT_CODE_MAP.get( cmdAndArgs[0] );
             }
             boolean success = exitCodes.contains( Integer.valueOf( exitCode ) );
 
             //On failure (and not due to exceptions) - run diagnostics
             String providerMsg = "Execution of hg command succeded";
             if ( !success )
             {
                 HgConfig config = new HgConfig( workingDir );
                 providerMsg =
                     "\nEXECUTION FAILED" + "\n  Execution of cmd : " + cmdAndArgs[0] + " failed with exit code: "
                         + exitCode + "." + "\n  Working directory was: " + "\n    " + workingDir.getAbsolutePath()
                         + config.toString( workingDir ) + "\n";
                 if ( logger.isErrorEnabled() )
                 {
                     logger.error( providerMsg );
                 }
             }
 
             return new ScmResult( cmd.toString(), providerMsg, consumer.getStdErr(), success );
         }
         catch ( ScmException se )
         {
             String msg =
                 "EXECUTION FAILED" + "\n  Execution failed before invoking the Hg command. Last exception:" + "\n    "
                     + se.getMessage();
 
             //Add nested cause if any
             if ( se.getCause() != null )
             {
                 msg += "\n  Nested exception:" + "\n    " + se.getCause().getMessage();
             }
 
             //log and return
             if ( logger.isErrorEnabled() )
             {
                 logger.error( msg );
             }
             throw se;
         }
     }
 
     static Commandline buildCmd( File workingDir, String[] cmdAndArgs )
         throws ScmException
     {
         Commandline cmd = new Commandline();
         cmd.setExecutable( HgCommandConstants.EXEC );
         cmd.addArguments( cmdAndArgs );
         if ( workingDir != null )
         {
             cmd.setWorkingDirectory( workingDir.getAbsolutePath() );
 
             if ( !workingDir.exists() )
             {
                 boolean success = workingDir.mkdirs();
                 if ( !success )
                 {
                     String msg = "Working directory did not exist" + " and it couldn't be created: " + workingDir;
                     throw new ScmException( msg );
                 }
             }
         }
         return cmd;
     }
 
     static int executeCmd( HgConsumer consumer, Commandline cmd )
         throws ScmException
     {
         final int exitCode;
         try
         {
             exitCode = CommandLineUtils.executeCommandLine( cmd, consumer, consumer );
         }
         catch ( CommandLineException ex )
         {
             throw new ScmException( "Command could not be executed: " + cmd, ex );
         }
         return exitCode;
     }
 
     public static ScmResult execute( File workingDir, String[] cmdAndArgs )
         throws ScmException
     {
         ScmLogger logger = new DefaultLog();
         return execute( new HgConsumer( logger ), logger, workingDir, cmdAndArgs );
     }
 
     public static String[] expandCommandLine( String[] cmdAndArgs, ScmFileSet additionalFiles )
     {
         List<File> filesList = additionalFiles.getFileList();
         String[] cmd = new String[filesList.size() + cmdAndArgs.length];
 
         // Copy command into array
         System.arraycopy( cmdAndArgs, 0, cmd, 0, cmdAndArgs.length );
 
         // Add files as additional parameter into the array
         int i = 0;
         for ( File scmFile : filesList )
         {
             String file = scmFile.getPath().replace( '\\', File.separatorChar );
             cmd[i + cmdAndArgs.length] = file;
             i++;
         }
 
         return cmd;
     }
 
     public static int getCurrentRevisionNumber( ScmLogger logger, File workingDir )
         throws ScmException
     {
 
         String[] revCmd = new String[]{ HgCommandConstants.REVNO_CMD };
         HgRevNoConsumer consumer = new HgRevNoConsumer( logger );
         HgUtils.execute( consumer, logger, workingDir, revCmd );
 
         return consumer.getCurrentRevisionNumber();
     }
 
     public static String getCurrentBranchName( ScmLogger logger, File workingDir )
         throws ScmException
     {
         String[] branchnameCmd = new String[]{ HgCommandConstants.BRANCH_NAME_CMD };
         HgBranchnameConsumer consumer = new HgBranchnameConsumer( logger );
         HgUtils.execute( consumer, logger, workingDir, branchnameCmd );
         return consumer.getBranchName();
     }
 
     /**
      * Get current (working) revision.
      * <p/>
      * Resolve revision to the last integer found in the command output.
      */
     private static class HgRevNoConsumer
         extends HgConsumer
     {
 
         private int revNo;
 
         HgRevNoConsumer( ScmLogger logger )
         {
             super( logger );
         }
 
         public void doConsume( ScmFileStatus status, String line )
         {
             try
             {
                 revNo = Integer.valueOf( line ).intValue();
             }
             catch ( NumberFormatException e )
             {
                 // ignore
             }
         }
 
         int getCurrentRevisionNumber()
         {
             return revNo;
         }
     }
 
     /**
      * Get current (working) branch name
      */
     private static class HgBranchnameConsumer
         extends HgConsumer
     {
 
         private String branchName;
 
         HgBranchnameConsumer( ScmLogger logger )
         {
             super( logger );
         }
 
         public void doConsume( ScmFileStatus status, String trimmedLine )
         {
             branchName = String.valueOf( trimmedLine );
         }
 
         String getBranchName()
         {
             return branchName;
         }
     }
 
 
     /**
      * Check if there are outgoing changes on a different branch. If so, Mercurial default behaviour
      * is to block the push and warn using a 'push creates new remote branch !' message.
      * We also warn, and return true if a different outgoing branch was found
      * <p/>
      * Method users should not stop the push on a negative return, instead, they should
      * hg push -r(branch being released)
      *
      * @param logger            the logger
      * @param workingDir        the working dir
      * @param workingbranchName the working branch name
      * @return true if a different outgoing branch was found
      * @throws ScmException on outgoing command error
      */
     public static boolean differentOutgoingBranchFound( ScmLogger logger, File workingDir, String workingbranchName )
         throws ScmException
     {
         String[] outCmd = new String[]{ HgCommandConstants.OUTGOING_CMD };
         HgOutgoingConsumer outConsumer = new HgOutgoingConsumer( logger );
         ScmResult outResult = HgUtils.execute( outConsumer, logger, workingDir, outCmd );
         List<HgChangeSet> changes = outConsumer.getChanges();
         if ( outResult.isSuccess() )
         {
             for ( HgChangeSet set : changes )
             {
                 if ( set.getBranch() != null )
                 {
                     logger.warn( "A different branch than " + workingbranchName
                         + " was found in outgoing changes, branch name was " + set.getBranch()
                         + ". Only local branch named " + workingbranchName + " will be pushed." );
                     return true;
                 }
             }
         }
         return false;
     }
 
     public static String maskPassword( Commandline cl )
     {
         String clString = cl.toString();
 
         int pos = clString.indexOf( '@' );
 
         if ( pos > 0 )
         {
             clString = clString.replaceAll( ":\\w+@", ":*****@" );
         }
 
         return clString;
     }
 }