package org.eclipse.aether.internal.test.util;
   
   /*
    * 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 java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import java.io.StringReader;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.graph.Exclusion;
  import org.eclipse.aether.repository.RemoteRepository;
  
  /**
   * @see IniArtifactDescriptorReader
   */
  class IniArtifactDataReader
  {
  
      private String prefix = "";
  
      /**
       * Constructs a data reader with the prefix {@code ""}.
       */
      IniArtifactDataReader()
      {
          this( "" );
      }
  
      /**
       * Constructs a data reader with the given prefix.
       * 
       * @param prefix the prefix to use for loading resources from the classpath.
       */
      IniArtifactDataReader( String prefix )
      {
          this.prefix = prefix;
  
      }
  
      /**
       * Load an artifact description from the classpath and parse it.
       */
      public ArtifactDescription parse( String resource )
          throws IOException
      {
          URL res = this.getClass().getClassLoader().getResource( prefix + resource );
  
          if ( res == null )
          {
              throw new IOException( "cannot find resource: " + resource );
          }
          return parse( res );
      }
  
      /**
       * Open the given URL and parse ist.
       */
      public ArtifactDescription parse( URL res )
          throws IOException
      {
          return parse( new InputStreamReader( res.openStream(), StandardCharsets.UTF_8 ) );
      }
  
      /**
       * Parse the given String.
       */
      public ArtifactDescription parseLiteral( String description )
          throws IOException
      {
          StringReader reader = new StringReader( description );
         return parse( reader );
     }
 
     private enum State
     {
         NONE, RELOCATION, DEPENDENCIES, MANAGEDDEPENDENCIES, REPOSITORIES
     }
 
     private ArtifactDescription parse( Reader reader )
         throws IOException
     {
         String line = null;
 
         State state = State.NONE;
 
         Map<State, List<String>> sections = new HashMap<>();
 
         BufferedReader in = null;
         try
         {
             in = new BufferedReader( reader );
             while ( ( line = in.readLine() ) != null )
             {
 
                 line = cutComment( line );
                 if ( isEmpty( line ) )
                 {
                     continue;
                 }
 
                 if ( line.startsWith( "[" ) )
                 {
                     try
                     {
                         String name = line.substring( 1, line.length() - 1 );
                         name = name.replace( "-", "" ).toUpperCase( Locale.ENGLISH );
                         state = State.valueOf( name );
                         sections.put( state, new ArrayList<String>() );
                     }
                     catch ( IllegalArgumentException e )
                     {
                         throw new IOException( "unknown section: " + line );
                     }
                 }
                 else
                 {
                     List<String> lines = sections.get( state );
                     if ( lines == null )
                     {
                         throw new IOException( "missing section: " + line );
                     }
                     lines.add( line.trim() );
                 }
             }
 
             in.close();
             in = null;
         }
         finally
         {
             try
             {
                 if ( in != null )
                 {
                     in.close();
                 }
             }
             catch ( final IOException e )
             {
                 // Suppressed due to an exception already thrown in the try block.
             }
         }
 
         Artifact relocation = relocation( sections.get( State.RELOCATION ) );
         List<Dependency> dependencies = dependencies( sections.get( State.DEPENDENCIES ), false );
         List<Dependency> managedDependencies = dependencies( sections.get( State.MANAGEDDEPENDENCIES ), true );
         List<RemoteRepository> repositories = repositories( sections.get( State.REPOSITORIES ) );
 
         return new ArtifactDescription( relocation, dependencies, managedDependencies, repositories );
     }
 
     private List<RemoteRepository> repositories( List<String> list )
     {
         ArrayList<RemoteRepository> ret = new ArrayList<>();
         if ( list == null )
         {
             return ret;
         }
         for ( String coords : list )
         {
             String[] split = coords.split( ":", 3 );
             String id = split[0];
             String type = split[1];
             String url = split[2];
 
             ret.add( new RemoteRepository.Builder( id, type, url ).build() );
         }
         return ret;
     }
 
     private List<Dependency> dependencies( List<String> list, boolean managed )
     {
         List<Dependency> ret = new ArrayList<>();
         if ( list == null )
         {
             return ret;
         }
 
         Collection<Exclusion> exclusions = new ArrayList<>();
 
         Boolean optional = null;
         Artifact artifact = null;
         String scope = null;
 
         for ( String coords : list )
         {
             if ( coords.startsWith( "-" ) )
             {
                 coords = coords.substring( 1 );
                 String[] split = coords.split( ":" );
                 exclusions.add( new Exclusion( split[0], split[1], "*", "*" ) );
             }
             else
             {
                 if ( artifact != null )
                 {
                     // commit dependency
                     Dependency dep = new Dependency( artifact, scope, optional, exclusions );
                     ret.add( dep );
 
                     exclusions = new ArrayList<>();
                 }
 
                 ArtifactDefinition def = new ArtifactDefinition( coords );
 
                 optional = managed ? def.getOptional() : Boolean.valueOf( Boolean.TRUE.equals( def.getOptional() ) );
 
                 scope = "".equals( def.getScope() ) && !managed ? "compile" : def.getScope();
 
                 artifact =
                     new DefaultArtifact( def.getGroupId(), def.getArtifactId(), "", def.getExtension(),
                                          def.getVersion() );
             }
         }
         if ( artifact != null )
         {
             // commit dependency
             Dependency dep = new Dependency( artifact, scope, optional, exclusions );
             ret.add( dep );
         }
 
         return ret;
     }
 
     private Artifact relocation( List<String> list )
     {
         if ( list == null || list.isEmpty() )
         {
             return null;
         }
         String coords = list.get( 0 );
         ArtifactDefinition def = new ArtifactDefinition( coords );
         return new DefaultArtifact( def.getGroupId(), def.getArtifactId(), "", def.getExtension(), def.getVersion() );
     }
 
     private static boolean isEmpty( String line )
     {
         return line == null || line.length() == 0;
     }
 
     private static String cutComment( String line )
     {
         int idx = line.indexOf( '#' );
 
         if ( idx != -1 )
         {
             line = line.substring( 0, idx );
         }
 
         return line;
     }
 
     static class Definition
     {
         private String groupId;
 
         private String artifactId;
 
         private String extension;
 
         private String version;
 
         private String scope = "";
 
         private String definition;
 
         private String id = null;
 
         private String reference = null;
 
         private boolean optional = false;
 
         Definition( String def )
         {
             this.definition = def.trim();
 
             if ( definition.startsWith( "(" ) )
             {
                 int idx = definition.indexOf( ')' );
                 this.id = definition.substring( 1, idx );
                 this.definition = definition.substring( idx + 1 );
             }
             else if ( definition.startsWith( "^" ) )
             {
                 this.reference = definition.substring( 1 );
                 return;
             }
 
             String[] split = definition.split( ":" );
             if ( split.length < 4 )
             {
                 throw new IllegalArgumentException( "Need definition like 'gid:aid:ext:ver[:scope]', but was: "
                     + definition );
             }
             groupId = split[0];
             artifactId = split[1];
             extension = split[2];
             version = split[3];
             if ( split.length > 4 )
             {
                 scope = split[4];
             }
             if ( split.length > 5 && "true".equalsIgnoreCase( split[5] ) )
             {
                 optional = true;
             }
         }
 
         public String getGroupId()
         {
             return groupId;
         }
 
         public String getArtifactId()
         {
             return artifactId;
         }
 
         public String getType()
         {
             return extension;
         }
 
         public String getVersion()
         {
             return version;
         }
 
         public String getScope()
         {
             return scope;
         }
 
         @Override
         public String toString()
         {
             return definition;
         }
 
         public String getId()
         {
             return id;
         }
 
         public String getReference()
         {
             return reference;
         }
 
         public boolean isReference()
         {
             return reference != null;
         }
 
         public boolean hasId()
         {
             return id != null;
         }
 
         public boolean isOptional()
         {
             return optional;
         }
     }
 
 }