package org.apache.maven.scm.provider.git.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.ScmException;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.ScmProviderRepositoryWithHost;
  
  import java.io.UnsupportedEncodingException;
  import java.net.URLDecoder;
  import java.net.URLEncoder;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   * @author <a href="mailto:struberg@apache.org">Mark Struberg</a>
   *
   */
  public class GitScmProviderRepository
      extends ScmProviderRepositoryWithHost
  {
  
      /**
       * sequence used to delimit the fetch URL
       */
      public static final String URL_DELIMITER_FETCH = "[fetch=]";
  
      /**
       * sequence used to delimit the push URL
       */
      public static final String URL_DELIMITER_PUSH = "[push=]";
  
      /**
       * this trails every protocol
       */
      public static final String PROTOCOL_SEPARATOR = "://";
  
      /**
       * use local file as transport
       */
      public static final String PROTOCOL_FILE = "file";
  
      /**
       * use gits internal protocol
       */
      public static final String PROTOCOL_GIT = "git";
  
      /**
       * use secure shell protocol
       */
      public static final String PROTOCOL_SSH = "ssh";
  
      /**
       * use the standard port 80 http protocol
       */
      public static final String PROTOCOL_HTTP = "http";
  
      /**
       * use the standard port 443 https protocol
       */
      public static final String PROTOCOL_HTTPS = "https";
  
      /**
       * use rsync for retrieving the data
       * TODO implement!
       */
      public static final String PROTOCOL_RSYNC = "rsync";
  
      private static final Pattern HOST_AND_PORT_EXTRACTOR =
          Pattern.compile( "([^:/\\\\~]*)(?::(\\d*))?(?:([:/\\\\~])(.*))?" );
  
      /**
       * No special protocol specified. Git will either use git://
       * or ssh:// depending on whether we work locally or over the network
       */
      public static final String PROTOCOL_NONE = "";
  
      /**
       * this may either 'git' or 'jgit' depending on the underlying implementation being used
       */
      private String provider;
 
     /**
      * the URL used to fetch from the upstream repository
      */
     private RepositoryUrl fetchInfo;
 
     /**
      * the URL used to push to the upstream repository
      */
     private RepositoryUrl pushInfo;
 
     public GitScmProviderRepository( String url )
         throws ScmException
     {
         if ( url == null )
         {
             throw new ScmException( "url must not be null" );
         }
 
         if ( url.startsWith( URL_DELIMITER_FETCH ) )
         {
             String fetch = url.substring( URL_DELIMITER_FETCH.length() );
 
             int indexPushDelimiter = fetch.indexOf( URL_DELIMITER_PUSH );
             if ( indexPushDelimiter >= 0 )
             {
                 String push = fetch.substring( indexPushDelimiter + URL_DELIMITER_PUSH.length() );
                 pushInfo = parseUrl( push );
 
                 fetch = fetch.substring( 0, indexPushDelimiter );
             }
 
             fetchInfo = parseUrl( fetch );
 
             if ( pushInfo == null )
             {
                 pushInfo = fetchInfo;
             }
         }
         else if ( url.startsWith( URL_DELIMITER_PUSH ) )
         {
             String push = url.substring( URL_DELIMITER_PUSH.length() );
 
             int indexFetchDelimiter = push.indexOf( URL_DELIMITER_FETCH );
             if ( indexFetchDelimiter >= 0 )
             {
                 String fetch = push.substring( indexFetchDelimiter + URL_DELIMITER_FETCH.length() );
                 fetchInfo = parseUrl( fetch );
 
                 push = push.substring( 0, indexFetchDelimiter );
             }
 
             pushInfo = parseUrl( push );
 
             if ( fetchInfo == null )
             {
                 fetchInfo = pushInfo;
             }
         }
         else
         {
             fetchInfo = pushInfo = parseUrl( url );
         }
 
         // set the default values for backward compatibility from the push url
         // because it's more likely that the push URL contains 'better' credentials
         setUser( pushInfo.getUserName() );
         setPassword( pushInfo.getPassword() );
         setHost( pushInfo.getHost() );
         if ( pushInfo.getPort() != null && pushInfo.getPort().length() > 0 )
         {
             setPort( Integer.parseInt( pushInfo.getPort() ) );
         }
     }
 
     public GitScmProviderRepository( String url, String user, String password )
         throws ScmException
     {
         this( url );
 
         setUser( user );
 
         setPassword( password );
     }
 
     /**
      * @return either 'git' or 'jgit' depending on the underlying implementation being used
      */
     public String getProvider()
     {
         return provider;
     }
 
     public RepositoryUrl getFetchInfo()
     {
         return fetchInfo;
     }
 
     public RepositoryUrl getPushInfo()
     {
         return pushInfo;
     }
 
 
     /**
      * @return the URL used to fetch from the upstream repository
      */
     public String getFetchUrl()
     {
         return getUrl( fetchInfo );
     }
 
     /**
      * @return the URL used to push to the upstream repository
      */
     public String getPushUrl()
     {
         return getUrl( pushInfo );
     }
 
 
     /**
      * Parse the given url string and store all the extracted
      * information in a {@code RepositoryUrl}
      *
      * @param url to parse
      * @return filled with the information from the given URL
      * @throws ScmException
      */
     private RepositoryUrl parseUrl( String url )
         throws ScmException
     {
         RepositoryUrl repoUrl = new RepositoryUrl();
 
         url = parseProtocol( repoUrl, url );
         url = parseUserInfo( repoUrl, url );
         url = parseHostAndPort( repoUrl, url );
         // the rest of the url must be the path to the repository on the server
         repoUrl.setPath( url );
         return repoUrl;
     }
 
 
     /**
      * @param repoUrl
      * @return
      */
     private String getUrl( RepositoryUrl repoUrl )
     {
         StringBuilder urlSb = new StringBuilder( repoUrl.getProtocol() );
         boolean urlSupportsUserInformation = false;
 
         if ( PROTOCOL_SSH.equals( repoUrl.getProtocol() ) || PROTOCOL_RSYNC.equals( repoUrl.getProtocol() )
             || PROTOCOL_GIT.equals( repoUrl.getProtocol() ) || PROTOCOL_HTTP.equals( repoUrl.getProtocol() )
             || PROTOCOL_HTTPS.equals( repoUrl.getProtocol() ) || PROTOCOL_NONE.equals( repoUrl.getProtocol() ) )
         {
             urlSupportsUserInformation = true;
         }
 
         if ( repoUrl.getProtocol() != null && repoUrl.getProtocol().length() > 0 )
         {
             urlSb.append( "://" );
         }
 
         // add user information if given and allowed for the protocol
         if ( urlSupportsUserInformation )
         {
             String userName = repoUrl.getUserName();
             // if specified on the commandline or other configuration, we take this.
             if ( getUser() != null && getUser().length() > 0 )
             {
                 userName = getUser();
             }
 
             String password = repoUrl.getPassword();
             if ( getPassword() != null && getPassword().length() > 0 )
             {
                 password = getPassword();
             }
 
             if ( userName != null && userName.length() > 0 )
             {
                 try
                 {
                     urlSb.append( URLEncoder.encode( userName, "UTF-8" ) );
                 }
                 catch ( UnsupportedEncodingException e )
                 {
                     // Quite impossible...
                     // Otherwise throw a RTE, since this method is also used by toString()
                     e.printStackTrace();
                 }
 
                 if ( password != null && password.length() > 0 )
                 {
                     urlSb.append( ':' );
                     try
                     {
                         urlSb.append( URLEncoder.encode( password, "UTF-8" ) );
                     }
                     catch ( UnsupportedEncodingException e )
                     {
                         // Quite impossible...
                         // Otherwise throw a RTE, since this method is also used by toString()
                         e.printStackTrace();
                     }
                 }
 
                 urlSb.append( '@' );
             }
         }
 
         // add host and port information
         urlSb.append( repoUrl.getHost() );
         if ( repoUrl.getPort() != null && repoUrl.getPort().length() > 0 )
         {
             urlSb.append( ':' ).append( repoUrl.getPort() );
         }
 
         // finaly we add the path to the repo on the host
         urlSb.append( repoUrl.getPath() );
 
         return urlSb.toString();
     }
 
     /**
      * Parse the protocol from the given url and fill it into the given RepositoryUrl.
      *
      * @param repoUrl
      * @param url
      * @return the given url with the protocol parts removed
      */
     private String parseProtocol( RepositoryUrl repoUrl, String url )
         throws ScmException
     {
         // extract the protocol
         if ( url.startsWith( PROTOCOL_FILE + PROTOCOL_SEPARATOR ) )
         {
             repoUrl.setProtocol( PROTOCOL_FILE );
         }
         else if ( url.startsWith( PROTOCOL_HTTPS + PROTOCOL_SEPARATOR ) )
         {
             repoUrl.setProtocol( PROTOCOL_HTTPS );
         }
         else if ( url.startsWith( PROTOCOL_HTTP + PROTOCOL_SEPARATOR ) )
         {
             repoUrl.setProtocol( PROTOCOL_HTTP );
         }
         else if ( url.startsWith( PROTOCOL_SSH + PROTOCOL_SEPARATOR ) )
         {
             repoUrl.setProtocol( PROTOCOL_SSH );
         }
         else if ( url.startsWith( PROTOCOL_GIT + PROTOCOL_SEPARATOR ) )
         {
             repoUrl.setProtocol( PROTOCOL_GIT );
         }
         else if ( url.startsWith( PROTOCOL_RSYNC + PROTOCOL_SEPARATOR ) )
         {
             repoUrl.setProtocol( PROTOCOL_RSYNC );
         }
         else
         {
             // when no protocol is specified git will pick either ssh:// or git://
             // depending on whether we work locally or over the network
             repoUrl.setProtocol( PROTOCOL_NONE );
             return url;
         }
 
         url = url.substring( repoUrl.getProtocol().length() + 3 );
 
         return url;
     }
 
     /**
      * Parse the user information from the given url and fill
      * user name and password into the given RepositoryUrl.
      *
      * @param repoUrl
      * @param url
      * @return the given url with the user parts removed
      */
     private String parseUserInfo( RepositoryUrl repoUrl, String url )
         throws ScmException
     {
         // extract user information
         int indexAt = url.lastIndexOf( '@' );
         if ( indexAt >= 0 )
         {
             String userInfo = url.substring( 0, indexAt );
             int indexPwdSep = userInfo.indexOf( ':' );
             if ( indexPwdSep < 0 )
             {
                 repoUrl.setUserName( userInfo );
             }
             else
             {
                 repoUrl.setUserName( userInfo.substring( 0, indexPwdSep ) );
                 repoUrl.setPassword( userInfo.substring( indexPwdSep + 1 ) );
             }
 
             url = url.substring( indexAt + 1 );
         }
         return url;
     }
 
     /**
      * Parse server and port from the given url and fill it into the
      * given RepositoryUrl.
      *
      * @param repoUrl
      * @param url
      * @return the given url with the server parts removed
      * @throws ScmException
      */
     private String parseHostAndPort( RepositoryUrl repoUrl, String url )
         throws ScmException
     {
 
         repoUrl.setPort( "" );
         repoUrl.setHost( "" );
 
         if ( PROTOCOL_FILE.equals( repoUrl.getProtocol() ) )
         {
             // a file:// URL doesn't need any further parsing as it cannot contain a port, etc
             return url;
         }
         else
         {
 
             Matcher hostAndPortMatcher = HOST_AND_PORT_EXTRACTOR.matcher( url );
             if ( hostAndPortMatcher.matches() )
             {
                 if ( hostAndPortMatcher.groupCount() > 1 && hostAndPortMatcher.group( 1 ) != null )
                 {
                     repoUrl.setHost( hostAndPortMatcher.group( 1 ) );
                 }
                 if ( hostAndPortMatcher.groupCount() > 2 && hostAndPortMatcher.group( 2 ) != null )
                 {
                     repoUrl.setPort( hostAndPortMatcher.group( 2 ) );
                 }
 
                 StringBuilder computedUrl = new StringBuilder();
                 if ( hostAndPortMatcher.group( hostAndPortMatcher.groupCount() - 1 ) != null )
                 {
                     computedUrl.append( hostAndPortMatcher.group( hostAndPortMatcher.groupCount() - 1 ) );
                 }
                 if ( hostAndPortMatcher.group( hostAndPortMatcher.groupCount() ) != null )
                 {
                     computedUrl.append( hostAndPortMatcher.group( hostAndPortMatcher.groupCount() ) );
                 }
                 return computedUrl.toString();
             }
             else
             {
                 // Pattern doesn't match, let's return the original url
                 return url;
             }
         }
     }
 
 
     /**
      * {@inheritDoc}
      */
     public String getRelativePath( ScmProviderRepository ancestor )
     {
         if ( ancestor instanceof GitScmProviderRepository )
         {
             GitScmProviderRepository gitAncestor = (GitScmProviderRepository) ancestor;
 
             //X TODO review!
             String url = getFetchUrl();
             String path = url.replaceFirst( gitAncestor.getFetchUrl() + "/", "" );
 
             if ( !path.equals( url ) )
             {
                 return path;
             }
         }
         return null;
     }
 
     /**
      * {@inheritDoc}
      */
     public String toString()
     {
         // yes we really like to check if those are the exact same instance!
         if ( fetchInfo == pushInfo )
         {
             return getUrl( fetchInfo );
         }
         return URL_DELIMITER_FETCH + getUrl( fetchInfo ) + URL_DELIMITER_PUSH + getUrl( pushInfo );
     }
 
 }