package org.apache.maven.index.artifact;
   
   /*
    * 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 javax.inject.Named;
  import javax.inject.Singleton;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * An M1 <code>GavCalculator</code>. Heavily under-maintained.
   * 
   * @author Jason van Zyl
   * @author Tamas Cservenak
   */
  @Singleton
  @Named( "maven1" )
  public class M1GavCalculator
      implements GavCalculator
  {
  
      private static final Pattern PAT1 = Pattern.compile( "^([^0-9]+)-([0-9].+)\\.([^0-9]+)(\\.md5|\\.sha1){0,1}$" );
  
      private static final Pattern PAT2 =
          Pattern.compile( "^([a-z0-9-_]+)-([0-9-].+)\\.([^0-9]+)(\\.md5|\\.sha1){0,1}$" );
  
      public Gav pathToGav( String str )
      {
          try
          {
              String s = str.startsWith( "/" ) ? str.substring( 1 ) : str;
  
              int n1 = s.lastIndexOf( '/' );
  
              if ( n1 == -1 )
              {
                  return null;
              }
  
              int n2 = s.lastIndexOf( '/', n1 - 1 );
  
              if ( n2 == -1 )
              {
                  return null;
              }
  
              String g = s.substring( 0, n2 ).replace( '/', '.' );
              String middle = s.substring( n2 + 1, n1 );
              String n = s.substring( n1 + 1 );
  
              String classifier = null;
              if ( "java-sources".equals( middle ) )
              {
                  classifier = "sources";
              }
              else if ( "javadocs".equals( middle ) )
              {
                  classifier = "javadoc";
              }
              else if ( "ejbs".equals( middle )
                  && ( n.endsWith( "client.jar" ) || n.endsWith( "client.jar.sha1" ) || n.endsWith( "client.jar.md5" ) ) )
              {
                  classifier = "client";
              }
  
              boolean checksum = false;
              Gav.HashType checksumType = null;
              if ( s.endsWith( ".md5" ) )
              {
                  checksum = true;
                  checksumType = Gav.HashType.md5;
                  s = s.substring( 0, s.length() - 4 );
              }
              else if ( s.endsWith( ".sha1" ) )
              {
                  checksum = true;
                  checksumType = Gav.HashType.sha1;
                  s = s.substring( 0, s.length() - 5 );
              }
  
              if ( s.endsWith( "maven-metadata.xml" ) )
              {
                 return null;
             }
 
             String ext = s.substring( s.lastIndexOf( '.' ) + 1 );
 
             Matcher m = PAT1.matcher( n );
             if ( m.matches() )
             {
                 String a = m.group( 1 );
                 String version = m.group( 2 );
                 if ( classifier != null )
                 {
                     version = version.substring( 0, version.length() - ( classifier.length() + 1 ) );
                 }
 
                 return new Gav( g, a, version, classifier, ext, null, null, n, checksum, checksumType, false,
                     null );
             }
             else
             {
                 m = PAT2.matcher( n );
                 if ( m.matches() )
                 {
                     String a = m.group( 1 );
                     String version = m.group( 2 );
                     if ( classifier != null )
                     {
                         version = version.substring( 0, version.length() - ( classifier.length() + 1 ) );
                     }
 
                     return new Gav( g, a, version, classifier, ext, null, null, n, checksum, checksumType,
                         false, null );
                 }
                 else
                 {
                     return null;
                 }
             }
         }
         catch ( StringIndexOutOfBoundsException e )
         {
             return null;
         }
         catch ( IndexOutOfBoundsException e )
         {
             return null;
         }
     }
 
     /**
      * // XXX this is not accurate, m1 is using packaging as an artifact folder name.
      * 
      * @see org.apache.maven.artifact.repository.layout.LegacyRepositoryLayout#pathOf(org.apache.maven.artifact.Artifact)
      * @see org.apache.maven.artifact.handler.DefaultArtifactHandler#getDirectory()
      */
     public String gavToPath( Gav gav )
     {
         StringBuilder path = new StringBuilder( "/" );
 
         path.append( gav.getGroupId() );
 
         path.append( "/" );
 
         if ( gav.getClassifier() == null )
         {
             path.append( gav.getExtension() );
 
             path.append( "s" );
         }
         else
         {
             if ( gav.getClassifier().startsWith( "source" ) )
             {
                 path.append( "java-source" );
             }
             else if ( gav.getClassifier().startsWith( "client" ) )
             {
                 path.append( "ejb" );
             }
             else
             {
                 path.append( gav.getClassifier() );
             }
             path.append( "s" );
         }
 
         path.append( "/" );
 
         path.append( gav.getArtifactId() );
 
         path.append( "-" );
 
         path.append( gav.getVersion() );
 
         if ( gav.getClassifier() != null )
         {
             path.append( "-" );
 
             path.append( gav.getClassifier() );
         }
 
         path.append( "." );
 
         path.append( gav.getExtension() );
 
         if ( gav.isHash() )
         {
             path.append( "." );
 
             path.append( gav.getHashType().toString() );
         }
 
         return path.toString();
     }
 
 }