package org.apache.maven.plugins.invoker;
   
   /*
    * 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.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Properties;
  import java.util.stream.Collectors;
  
  import org.apache.maven.plugins.invoker.AbstractInvokerMojo.ToolchainPrivateManager;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.toolchain.MisconfiguredToolchainException;
  import org.apache.maven.toolchain.ToolchainPrivate;
  import org.codehaus.plexus.util.Os;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Provides utility methods for selecting build jobs based on environmental conditions.
   *
   * @author Benjamin Bentmann
   */
  class SelectorUtils
  {
  
      static void parseList( String list, Collection<String> includes, Collection<String> excludes )
      {
          String[] tokens = ( list != null ) ? StringUtils.split( list, "," ) : new String[0];
  
          for ( String token1 : tokens )
          {
              String token = token1.trim();
  
              if ( token.startsWith( "!" ) )
              {
                  excludes.add( token.substring( 1 ) );
              }
              else
              {
                  includes.add( token );
              }
          }
      }
  
      static boolean isOsFamily( String osSpec )
      {
          List<String> includes = new ArrayList<>();
          List<String> excludes = new ArrayList<>();
          parseList( osSpec, includes, excludes );
  
          return isOsFamily( includes, true ) && !isOsFamily( excludes, false );
      }
  
      static boolean isOsFamily( List<String> families, boolean defaultMatch )
      {
          if ( families != null && !families.isEmpty() )
          {
              for ( String family : families )
              {
                  if ( Os.isFamily( family ) )
                  {
                      return true;
                  }
              }
  
              return false;
          }
          else
          {
              return defaultMatch;
          }
      }
  
      /**
      * Retrieves the current Maven version.
      *
      * @return The current Maven version.
      */
     static String getMavenVersion()
     {
         try
         {
             // This relies on the fact that MavenProject is the in core classloader
             // and that the core classloader is for the maven-core artifact
             // and that should have a pom.properties file
             // if this ever changes, we will have to revisit this code.
             Properties properties = new Properties();
             // CHECKSTYLE_OFF: LineLength
             properties.load( MavenProject.class.getClassLoader()
                                  .getResourceAsStream( "META-INF/maven/org.apache.maven/maven-core/pom.properties" ) );
             // CHECKSTYLE_ON: LineLength
             return StringUtils.trim( properties.getProperty( "version" ) );
         }
         catch ( Exception e )
         {
             return null;
         }
     }
 
     static String getMavenVersion( File mavenHome ) throws IOException
     {
         File mavenLib = new File( mavenHome, "lib" );
         File[] jarFiles = mavenLib.listFiles( ( dir, name ) -> name.endsWith( ".jar" ) );
 
         if ( jarFiles == null )
         {
             throw new IllegalArgumentException( "Invalid Maven home installation directory: " + mavenHome );
         }
 
         for ( File file : jarFiles )
         {
             try
             {
                 URL url = new URL( "jar:" + file.toURI().toURL().toExternalForm()
                                  + "!/META-INF/maven/org.apache.maven/maven-core/pom.properties" );
 
                 try ( InputStream in = url.openStream() )
                 {
                     Properties properties = new Properties();
                     properties.load( in );
                     String version = StringUtils.trim( properties.getProperty( "version" ) );
                     if ( version != null )
                     {
                         return version;
                     }
                 }
             }
             catch ( FileNotFoundException | MalformedURLException e )
             {
                 // ignore
             }
         }
         return null;
     }
 
     static boolean isMavenVersion( String mavenSpec )
     {
         return isMavenVersion( mavenSpec, getMavenVersion() );
     }
 
     static boolean isMavenVersion( String mavenSpec, String actualVersion )
     {
         List<String> includes = new ArrayList<>();
         List<String> excludes = new ArrayList<>();
         parseList( mavenSpec, includes, excludes );
 
         List<Integer> mavenVersionList = parseVersion( actualVersion );
 
         return isJreVersion( mavenVersionList, includes, true ) && !isJreVersion( mavenVersionList, excludes, false );
     }
 
     static String getJreVersion()
     {
         return System.getProperty( "java.version", "" );
     }
 
     static String getJreVersion( File javaHome )
     {
         // @todo detect actual version
         return null;
     }
 
     static boolean isJreVersion( String jreSpec )
     {
         return isJreVersion( jreSpec, getJreVersion() );
     }
 
     static boolean isJreVersion( String jreSpec, String actualJreVersion )
     {
         List<String> includes = new ArrayList<>();
         List<String> excludes = new ArrayList<>();
         parseList( jreSpec, includes, excludes );
 
         List<Integer> jreVersion = parseVersion( actualJreVersion );
 
         return isJreVersion( jreVersion, includes, true ) && !isJreVersion( jreVersion, excludes, false );
     }
 
     static boolean isJreVersion( List<Integer> jreVersion, List<String> versionPatterns, boolean defaultMatch )
     {
         if ( versionPatterns != null && !versionPatterns.isEmpty() )
         {
             for ( String versionPattern : versionPatterns )
             {
                 if ( isJreVersion( jreVersion, versionPattern ) )
                 {
                     return true;
                 }
             }
 
             return false;
         }
         else
         {
             return defaultMatch;
         }
     }
 
     static boolean isJreVersion( List<Integer> jreVersion, String versionPattern )
     {
         List<Integer> checkVersion = parseVersion( versionPattern );
 
         if ( versionPattern.endsWith( "+" ) )
         {
             // 1.5+ <=> [1.5,)
             return compareVersions( jreVersion, checkVersion ) >= 0;
         }
         else if ( versionPattern.endsWith( "-" ) )
         {
             // 1.5- <=> (,1.5)
             return compareVersions( jreVersion, checkVersion ) < 0;
         }
         else
         {
             // 1.5 <=> [1.5,1.6)
             return checkVersion.size() <= jreVersion.size()
                 && checkVersion.equals( jreVersion.subList( 0, checkVersion.size() ) );
         }
     }
 
     static List<Integer> parseVersion( String version )
     {
         version = version.replaceAll( "[^0-9]", "." );
 
         String[] tokens = StringUtils.split( version, "." );
 
         List<Integer> numbers = Arrays.stream( tokens ).map( Integer::valueOf ).collect( Collectors.toList() );
 
         return numbers;
     }
 
     static int compareVersions( List<Integer> version1, List<Integer> version2 )
     {
         for ( Iterator<Integer> it1 = version1.iterator(), it2 = version2.iterator(); ; )
         {
             if ( !it1.hasNext() )
             {
                 return it2.hasNext() ? -1 : 0;
             }
             if ( !it2.hasNext() )
             {
                 return it1.hasNext() ? 1 : 0;
             }
 
             Integer num1 = it1.next();
             Integer num2 = it2.next();
 
             int rel = num1.compareTo( num2 );
             if ( rel != 0 )
             {
                 return rel;
             }
         }
     }
 
     /**
      * @param toolchainPrivateManager
      * @param invokerToolchains
      * @return {@code true} if all invokerToolchains are available, otherwise {@code false}
      */
     static boolean isToolchain( ToolchainPrivateManager toolchainPrivateManager,
                                 Collection<InvokerToolchain> invokerToolchains )
     {
         for ( InvokerToolchain invokerToolchain : invokerToolchains )
         {
             boolean found = false;
             try
             {
                 for ( ToolchainPrivate tc : toolchainPrivateManager.getToolchainPrivates( invokerToolchain.getType() ) )
                 {
                     if ( !invokerToolchain.getType().equals( tc.getType() ) )
                     {
                         // useful because of MNG-5716
                         continue;
                     }
 
                     if ( tc.matchesRequirements( invokerToolchain.getProvides() ) )
                     {
                         found = true;
                         continue;
                     }
                 }
             }
             catch ( MisconfiguredToolchainException e )
             {
                 return false;
             }
 
             if ( !found )
             {
                 return false;
             }
         }
 
         return true;
     }
 }