package org.apache.maven.scm.provider.hg.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.provider.ScmProviderRepositoryWithHost;
  import org.codehaus.plexus.util.StringUtils;
  
  import java.io.File;
  
  /**
   * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
   *
   */
  public class HgScmProviderRepository
      extends ScmProviderRepositoryWithHost
  {
      //Known and tested protocols
      private static final String FILE = "";
  
      private static final String SFTP = "sftp://";
  
      private static final String FTP = "ftp://";
  
      private static final String AFTP = "aftp://";
  
      private static final String HTTP = "http://";
  
      private static final String HTTPS = "https://";
  
      private final String path;
  
      private final String protocol;
  
      private final String orgUrl;
  
      public HgScmProviderRepository( String url )
      {
          orgUrl = url;
          protocol = getProtocol( url );
          path = parseUrl( url );
      }
  
      public String getURI()
      {
          return protocol + addAuthority() + addHost() + addPort() + addPath();
      }
  
      /**
       * @return A message if the repository as an invalid URI, null if the URI seems fine.
       */
      public String validateURI()
      {
  
          String msg = null;
  
          if ( needsAuthentication() )
          {
              if ( getUser() == null )
              {
                  msg = "Username is missing for protocol " + protocol;
              }
              else if ( getPassword() == null )
              {
                  msg = "Password is missing for protocol " + protocol;
              }
              else if ( getHost() == null )
              {
                  msg = "Host (eg. www.myhost.com) is missing for protocol " + protocol;
              }
          }
  
          else if ( getPort() != 0 && getHost() == null )
          {
              msg = "Got port information without any host for protocol " + protocol;
          }
  
          if ( msg != null )
          {
              msg =
                  "Something could be wrong about the repository URL: " + orgUrl + "\nReason: " + msg
                      + "\nCheck http://maven.apache.org/scm for usage and hints.";
          }
         return msg;
     }
 
     private String getProtocol( String url )
     {
         // Assume we have a file unless we find a URL based syntax
         String prot = FILE;
         if ( url.startsWith( SFTP ) )
         {
             prot = SFTP;
         }
         else if ( url.startsWith( HTTP ) )
         {
             prot = HTTP;
         }
         else if ( url.startsWith( HTTPS ) )
         {
             prot = HTTPS;
         }
 
         return prot;
     }
 
     private String parseUrl( String url )
     {
         if ( protocol == FILE )
         {
             return url;
         }
 
         //Strip protocol
         url = url.substring( protocol.length() );
 
         url = parseUsernameAndPassword( url );
 
         url = parseHostAndPort( url );
 
         url = parsePath( url );
 
         return url; //is now only the path
     }
 
     private String parseHostAndPort( String url )
     {
         if ( protocol != FILE )
         {
             int indexSlash = url.indexOf( '/' );
 
             String hostPort = url;
             if ( indexSlash > 0 )
             {
                 hostPort = url.substring( 0, indexSlash );
                 url = url.substring( indexSlash );
             }
 
             int indexColon = hostPort.indexOf( ':' );
             if ( indexColon > 0 )
             {
                 setHost( hostPort.substring( 0, indexColon ) );
                 setPort( Integer.parseInt( hostPort.substring( indexColon + 1 ) ) );
             }
             else
             {
                 setHost( hostPort );
             }
         }
 
         return url;
     }
 
     private String parseUsernameAndPassword( String url )
     {
         if ( canAuthenticate() )
         {
             String[] split = url.split( "@" );
             if ( split.length == 2 )
             {
                 url = split[1]; //Strip away 'username:password@' from url
                 split = split[0].split( ":" );
                 if ( split.length == 2 )
                 { //both username and password
                     setUser( split[0] );
                     setPassword( split[1] );
                 }
                 else
                 { //only username
                     setUser( split[0] );
                 }
             }
         }
         return url;
     }
 
     private String parsePath( String url )
     {
         if ( protocol == FILE )
         {
             //Use OS dependent path separator
             url = StringUtils.replace( url, "/", File.separator );
 
             //Test first path separator (*nix systems use them to denote root)
             File tmpFile = new File( url ); //most likly a *nix system
             String url2 = url.substring( File.pathSeparator.length() );
             File tmpFile2 = new File( url2 ); //most likly a windows system
             if ( !tmpFile.exists() && !tmpFile2.exists() )
             {
                 // This is trouble - Trouble is reported in validateURI()
             }
 
             url = tmpFile2.exists() ? url2 : url;
         }
 
         return url;
     }
 
     private String addUser()
     {
         return ( getUser() == null ) ? "" : getUser();
     }
 
     private String addPassword()
     {
         return ( getPassword() == null ) ? "" : ":" + getPassword();
     }
 
     private String addHost()
     {
         return ( getHost() == null ) ? "" : getHost();
     }
 
     private String addPort()
     {
         return ( getPort() == 0 ) ? "" : ":" + getPort();
     }
 
     private String addPath()
     {
         return path;
     }
 
     private boolean needsAuthentication()
     {
         return protocol == SFTP || protocol == FTP || protocol == HTTPS || protocol == AFTP;
     }
 
     private String addAuthority()
     {
         return ( ( canAuthenticate() && ( getUser() != null ) ) ? addUser() + addPassword() + "@" : "" );
     }
 
 
     private boolean canAuthenticate()
     {
         return needsAuthentication() || protocol == HTTP;
     }
     /** {@inheritDoc} */
     public String toString()
     {
         return "Hg Repository Interpreted from: " + orgUrl + ":\nProtocol: " + protocol + "\nHost: " + getHost()
             + "\nPort: " + getPort() + "\nUsername: " + getUser() + "\nPassword: " + getPassword() + "\nPath: "
             + path;
     }
 }