package org.apache.maven.scm.provider.bazaar;
   
   /*
    * 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.bazaar.command.BazaarConstants;
  import org.apache.maven.scm.provider.bazaar.command.BazaarConsumer;
  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 bazaar commands.
   *
   * @author <a href="mailto:torbjorn@smorgrav.org">Torbjorn Eikli Smorgrav</a>
   *
   */
  public final class BazaarUtils
  {
  
      private BazaarUtils()
      {
      }
  
      /**
       * Map between command and its valid exit codes
       */
      private static final Map<String,List<Integer>> EXITCODEMAP = new HashMap<String,List<Integer>>();
  
      /**
       * Default exit codes for entries not in exitCodeMap
       */
      private static final List<Integer> DEFAULTEEXITCODES = new ArrayList<Integer>();
  
      /** Setup exit codes*/
      static
      {
          DEFAULTEEXITCODES.add( Integer.valueOf( 0 ) );
  
          //Diff is different
          List<Integer> diffExitCodes = new ArrayList<Integer>();
          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
          EXITCODEMAP.put( BazaarConstants.DIFF_CMD, diffExitCodes );
      }
  
      public static ScmResult execute( BazaarConsumer consumer, ScmLogger logger, File workingDir, String[] cmdAndArgs )
          throws ScmException
      {
          try
          {
              //Build commandline
              Commandline cmd = buildCmd( workingDir, cmdAndArgs );
              if ( logger.isInfoEnabled() )
              {
                  logger.info( "EXECUTING: " + cmd );
              }
  
              //Execute command
              int exitCode = executeCmd( consumer, cmd );
  
              //Return result
              List<Integer> exitCodes = DEFAULTEEXITCODES;
              if ( EXITCODEMAP.containsKey( cmdAndArgs[0] ) )
              {
                  exitCodes = EXITCODEMAP.get( cmdAndArgs[0] );
              }
              boolean success = exitCodes.contains( Integer.valueOf( exitCode ) );
  
              //On failure (and not due to exceptions) - run diagnostics
             String providerMsg = "Execution of bazaar command succeded";
             if ( !success )
             {
                 BazaarConfig config = new BazaarConfig( 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 Bazaar 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( BazaarConstants.EXEC );
         cmd.setWorkingDirectory( workingDir.getAbsolutePath() );
         cmd.addArguments( cmdAndArgs );
 
         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( BazaarConsumer 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 BazaarConsumer( logger ), logger, workingDir, cmdAndArgs );
     }
 
     public static String[] expandCommandLine( String[] cmdAndArgs, ScmFileSet additionalFiles )
     {
         List<File> files = additionalFiles.getFileList();
         String[] cmd = new String[files.size() + cmdAndArgs.length];
 
         // Copy command into array
         System.arraycopy( cmdAndArgs, 0, cmd, 0, cmdAndArgs.length );
 
         // Add files as additional parameter into the array
         for ( int i = 0; i < files.size(); i++ )
         {
             String file = files.get( i ).getPath().replace( '\\', File.separatorChar );
             cmd[i + cmdAndArgs.length] = file;
         }
 
         return cmd;
     }
 
     public static int getCurrentRevisionNumber( ScmLogger logger, File workingDir )
         throws ScmException
     {
 
         String[] revCmd = new String[]{BazaarConstants.REVNO_CMD};
         BazaarRevNoConsumer consumer = new BazaarRevNoConsumer( logger );
         BazaarUtils.execute( consumer, logger, workingDir, revCmd );
 
         return consumer.getCurrentRevisionNumber();
     }
 
     /**
      * Get current (working) revision.
      * <p/>
      * Resolve revision to the last integer found in the command output.
      */
     private static class BazaarRevNoConsumer
         extends BazaarConsumer
     {
 
         private int revNo;
 
         BazaarRevNoConsumer( 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;
         }
     }
 }