package org.apache.maven.scm.provider.clearcase.repository;
   
   /*
    * 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.log.ScmLogger;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.providers.clearcase.settings.Settings;
  import org.apache.maven.scm.repository.ScmRepositoryException;
  
  import java.io.File;
  import java.net.InetAddress;
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.net.URL;
  import java.net.UnknownHostException;
  import java.util.StringTokenizer;
  
  /**
   * Provider Repository for ClearCase (standard, LT, UCM)
   * <p />
   * Url format for ClearCase and ClearCaseLT : <br />
   * [view_name]:[configspec] or [view_name]|[configspec]
   * <p />
   * Url format for ClearCaseUCM : <br />
   * [view_name]|[configspec]|[vob_name]|[stream_name] or [view_name]:[configspec]:[vob_name]:[stream_name]
   * <p />
   * [configspec] can be used in two different ways:
   * <ul>
   * <li>Path to a config spec file that is
   * used when creating the snapshot view, e.g.
   * "\\myserver\clearcase\configspecs\my_module.txt", or:</li>
   * <li>A load rule that is used to automatically create a config spec, e.g. "load /MY_VOB/my/project/dir"</li>
   * </ul>
   * Notice that checking out from a tag is currently only supported when the second option is used.
   *
   * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
   */
  public class ClearCaseScmProviderRepository
      extends ScmProviderRepository
  {
      private ScmLogger logger;
  
      private boolean viewNameGivenByUser = false;
  
      private String viewName;
  
      /**
       * The user-specified config spec; may be null.
       */
      private File configSpec;
  
      /**
       * The directory to be loaded, when auto-generating the config spec.
       */
      private String loadDirectory;
  
      /**
       * Describe the stream linked to the view. Only used with ClearCaseUCM
       */
      private String streamName;
  
      /**
       * Describe the vob containing the stream. Only used with ClearCaseUCM
       */
      private String vobName;
  
      /**
       * Provider configuration settings
       */
      private Settings settings;
  
      /**
       * Describe the Element Name
       */
      private String elementName;
  
      /**
       * Define the flag used in the clearcase-settings.xml when using ClearCaseLT
       */
      public static final String CLEARCASE_LT = "LT";
  
     /**
      * Define the flag used in the clearcase-settings.xml when using ClearCaseUCM
      */
     public static final String CLEARCASE_UCM = "UCM";
 
     /**
      * Define the default value from the clearcase-settings.xml when using ClearCase
      */
     public static final String CLEARCASE_DEFAULT = null;
 
     public ClearCaseScmProviderRepository( ScmLogger logger, String url, Settings settings )
         throws ScmRepositoryException
     {
         this.logger = logger;
         this.settings = settings;
         try
         {
             parseUrl( url );
         }
         catch ( MalformedURLException e )
         {
             throw new ScmRepositoryException( "Illegal URL: " + url + "(" + e.getMessage() + ")" );
         }
         catch ( URISyntaxException e )
         {
             throw new ScmRepositoryException( "Illegal URL: " + url + "(" + e.getMessage() + ")" );
         }
         catch ( UnknownHostException e )
         {
             throw new ScmRepositoryException( "Illegal URL: " + url + "(" + e.getMessage() + ")" );
         }
     }
 
     private void parseUrl( String url )
         throws MalformedURLException, URISyntaxException, UnknownHostException
     {
         if ( url.indexOf( '|' ) != -1 )
         {
             StringTokenizer tokenizer = new StringTokenizer( url, "|" );
             fillInProperties( tokenizer );
         }
         else
         {
             StringTokenizer tokenizer = new StringTokenizer( url, ":" );
             fillInProperties( tokenizer );
         }
     }
 
     private void fillInProperties( StringTokenizer tokenizer )
         throws UnknownHostException, URISyntaxException, MalformedURLException
     {
         String configSpecString = null;
 
         if ( CLEARCASE_UCM.equals( settings.getClearcaseType() ) )
         {
             configSpecString = fillUCMProperties( tokenizer );
         }
         else
         {
             configSpecString = fillDefaultProperties( tokenizer );
         }
 
         if ( !configSpecString.startsWith( "load " ) )
         {
             configSpec = createConfigSpecFile( configSpecString );
             loadDirectory = null;
         }
         else
         {
             configSpec = null;
             loadDirectory = configSpecString.substring( 5 );
 
         }
     }
 
     private String fillDefaultProperties( StringTokenizer tokenizer )
         throws UnknownHostException
     {
         int tokenNumber = tokenizer.countTokens();
         String configSpecString;
         if ( tokenNumber == 1 )
         {
             // No view name was given
             viewName = getDefaultViewName();
             configSpecString = tokenizer.nextToken();
         }
         else
         {
             configSpecString = checkViewName( tokenizer );
             checkUnexpectedParameter( tokenizer, tokenNumber, 2 );
         }
         if ( logger.isDebugEnabled() )
         {
             logger.debug( "viewName = '" + viewName + "' ; configSpec = '" + configSpecString + "'" );
         }
         return configSpecString;
     }
 
     private String fillUCMProperties( StringTokenizer tokenizer )
         throws UnknownHostException, MalformedURLException
     {
         int tokenNumber = tokenizer.countTokens();
         if ( tokenNumber <= 2 )
         {
             throw new MalformedURLException( "ClearCaseUCM need more parameters. Expected url format : "
                 + "[view_name]|[configspec]|[vob_name]|[stream_name]" );
         }
 
         String configSpecString;
         if ( tokenNumber == 3 )
         {
             // No view name was given
             viewName = getDefaultViewName();
             configSpecString = tokenizer.nextToken();
             vobName = tokenizer.nextToken();
             streamName = tokenizer.nextToken();
         }
         else if ( tokenNumber == 4 )
         {
             String[] tokens = new String[4];
             tokens[0] = tokenizer.nextToken();
             tokens[1] = tokenizer.nextToken();
             tokens[2] = tokenizer.nextToken();
             tokens[3] = tokenizer.nextToken();
 
             if ( tokens[3].startsWith( "/main/" ) )
             {
                 viewName = getDefaultViewName();
                 configSpecString = tokens[0];
                 vobName = tokens[1];
                 streamName = tokens[2];
                 elementName = tokens[3];
             }
             else
             {
                 viewName = tokens[0];
                 viewNameGivenByUser = true;
                 configSpecString = tokens[1];
                 vobName = tokens[2];
                 streamName = tokens[3];
             }
         }
         else
         {
             configSpecString = checkViewName( tokenizer );
             vobName = tokenizer.nextToken();
             streamName = tokenizer.nextToken();
             elementName = tokenizer.nextToken();
             checkUnexpectedParameter( tokenizer, tokenNumber, 5 );
         }
 
         if ( logger.isInfoEnabled() )
         {
             logger.info( "viewName = '" + viewName + "' ; configSpec = '" + configSpecString + "' ; vobName = '"
                 + vobName + "' ; streamName = '" + streamName + "' ; elementName = '" + elementName + "'" );
         }
 
         return configSpecString;
     }
 
     private String checkViewName( StringTokenizer tokenizer )
         throws UnknownHostException
     {
         viewName = tokenizer.nextToken();
         if ( viewName.length() > 0 )
         {
             viewNameGivenByUser = true;
         }
         else
         {
             viewName = getDefaultViewName();
         }
 
         return tokenizer.nextToken();
     }
 
     private void checkUnexpectedParameter( StringTokenizer tokenizer, int tokenNumber, int maxTokenNumber )
     {
         if ( tokenNumber > maxTokenNumber )
         {
             String unexpectedToken = tokenizer.nextToken();
             if ( logger.isInfoEnabled() )
             {
                 logger.info( "The SCM URL contains unused parameter : " + unexpectedToken );
             }
         }
     }
 
     private File createConfigSpecFile( String spec )
         throws URISyntaxException, MalformedURLException
     {
         File result;
         if ( spec.indexOf( ':' ) == -1 )
         {
             result = new File( spec );
         }
         else
         {
             result = new File( new URI( new URL( spec ).toString() ) );
         }
         return result;
     }
 
     /**
      * Default: ${hostname}-{user.name}-maven
      *
      * @return the default view name
      */
     private String getDefaultViewName()
         throws UnknownHostException
     {
         String username = System.getProperty( "user.name", "nouser" );
         String hostname = getHostName();
         return username + "-" + hostname + "-maven";
     }
 
     private String getHostName()
         throws UnknownHostException
     {
         return InetAddress.getLocalHost().getHostName();
     }
 
     /**
      * Returns the name of the view. If it is defined in the scm url, then it is returned as defined there.
      * If it is the default name, then the uniqueId is added
      *
      * @param uniqueId
      * @return the name of the view
      */
     public String getViewName( String uniqueId )
     {
         String result;
         if ( viewNameGivenByUser )
         {
             result = viewName;
         }
         else
         {
             result = viewName + "-" + uniqueId;
         }
 
         return result;
     }
 
     /**
      * Returns the user-supplied config spec or <code>null</code> in case it
      * should be automatically generated
      *
      * @return File or <code>null</code>
      * @see #isAutoConfigSpec()
      */
     public File getConfigSpec()
     {
         return configSpec;
     }
 
     /**
      * Returns true when the config spec has not been supplied by the user, but
      * instead should automatically be generated by the plugin
      *
      * @return true if auto config spec
      */
     public boolean isAutoConfigSpec()
     {
         return configSpec == null;
     }
 
     /**
      * Returns the VOB directory to be loaded when auto-generating the config
      * spec.
      *
      * @return <code>null</code> when isAutoConfigSpec() returns false;
      *         otherwise the VOB directory
      */
     public String getLoadDirectory()
     {
         return loadDirectory;
     }
 
     public String getStreamName()
     {
         return streamName;
     }
 
     public String getVobName()
     {
         return vobName;
     }
 
     public String getElementName()
     {
         return elementName;
     }
 
     public boolean hasElements()
     {
         if ( elementName == null )
         {
             return false;
         }
 
         return true;
     }
 }