package org.apache.maven.plugins.jlink;
   
   /*
    * 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.commons.lang3.StringUtils;
  import org.apache.commons.lang3.SystemUtils;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.logging.Log;
  import org.apache.maven.shared.utils.cli.CommandLineException;
  import org.apache.maven.shared.utils.cli.CommandLineUtils;
  import org.apache.maven.shared.utils.cli.Commandline;
  import org.apache.maven.toolchain.Toolchain;
  
  import java.io.File;
  import java.util.List;
  import java.util.NoSuchElementException;
  import java.util.Optional;
  
  abstract class AbstractJLinkToolchainExecutor extends AbstractJLinkExecutor
  {
      private final Toolchain toolchain;
  
      AbstractJLinkToolchainExecutor( Toolchain toolchain, Log log )
      {
          super( log );
          this.toolchain = toolchain;
      }
  
      protected Optional<Toolchain> getToolchain()
      {
          return Optional.ofNullable( this.toolchain );
      }
  
      /**
       * Execute JLink via toolchain.
       *
       * @return the exit code ({@code 0} on success).
       */
      @Override
      public int executeJlink( List<String> jlinkArgs ) throws MojoExecutionException
      {
          File jlinkExecutable = getJlinkExecutable();
          getLog().info( "Toolchain in maven-jlink-plugin: jlink [ " + jlinkExecutable + " ]" );
  
          Commandline cmd = createJLinkCommandLine( jlinkArgs );
          cmd.setExecutable( jlinkExecutable.getAbsolutePath() );
  
          return executeCommand( cmd );
      }
  
      private File getJlinkExecutable()
      {
          return new File( getJLinkExecutable() );
      }
  
      @Override
      public Optional<File> getJmodsFolder( /* nullable */ File sourceJdkModules )
      {
          // Really Hacky...do we have a better solution to find the jmods directory of the JDK?
          File jLinkParent = getJlinkExecutable().getParentFile().getParentFile();
          File jmodsFolder;
          if ( sourceJdkModules != null && sourceJdkModules.isDirectory() )
          {
              jmodsFolder = new File( sourceJdkModules, JMODS );
          }
          else
          {
              jmodsFolder = new File( jLinkParent, JMODS );
          }
  
          getLog().debug( " Parent: " + jLinkParent.getAbsolutePath() );
          getLog().debug( " jmodsFolder: " + jmodsFolder.getAbsolutePath() );
  
          return Optional.of( jmodsFolder );
      }
  
      private Commandline createJLinkCommandLine( List<String> jlinkArgs )
      {
          Commandline cmd = new Commandline();
          jlinkArgs.forEach( arg -> cmd.createArg().setValue( arg ) );
  
          return cmd;
     }
 
     private String getJLinkExecutable()
     {
         Optional<Toolchain> toolchain = getToolchain();
 
         if ( !toolchain.isPresent() )
         {
             getLog().error( "Either JDK9+ or a toolchain "
                     + "pointing to a JDK9+ containing a jlink binary is required." );
             getLog().info( "See https://maven.apache.org/guides/mini/guide-using-toolchains.html "
                     + "for mor information." );
             throw new IllegalStateException( "Running on JDK8 and no toolchain found." );
         }
 
         String jLinkExecutable = toolchain.orElseThrow( NoSuchElementException::new ).findTool( "jlink" );
 
         if ( jLinkExecutable.isEmpty() )
         {
             throw new IllegalStateException( "The jlink executable '"
                     + jLinkExecutable + "' doesn't exist or is not a file." );
         }
 
         // TODO: Check if there exist a more elegant way?
         String jLinkCommand = "jlink" + ( SystemUtils.IS_OS_WINDOWS ? ".exe" : "" );
 
         File jLinkExe = new File( jLinkExecutable );
 
         if ( jLinkExe.isDirectory() )
         {
             jLinkExe = new File( jLinkExe, jLinkCommand );
         }
 
         if ( SystemUtils.IS_OS_WINDOWS && jLinkExe.getName().indexOf( '.' ) < 0 )
         {
             jLinkExe = new File( jLinkExe.getPath() + ".exe" );
         }
 
         if ( !jLinkExe.isFile() )
         {
             throw new IllegalStateException( "The jlink executable '"
                     + jLinkExe + "' doesn't exist or is not a file." );
         }
         return jLinkExe.getAbsolutePath();
     }
 
     private int executeCommand( Commandline cmd )
             throws MojoExecutionException
     {
         if ( getLog().isDebugEnabled() )
         {
             // no quoted arguments ???
             getLog().debug( CommandLineUtils.toString( cmd.getCommandline() ).replaceAll( "'", "" ) );
         }
 
         CommandLineUtils.StringStreamConsumer err = new CommandLineUtils.StringStreamConsumer();
         CommandLineUtils.StringStreamConsumer out = new CommandLineUtils.StringStreamConsumer();
         try
         {
             int exitCode = CommandLineUtils.executeCommandLine( cmd, out, err );
 
             String output = ( StringUtils.isEmpty( out.getOutput() ) ? null : '\n' + out.getOutput().trim() );
 
             if ( exitCode != 0 )
             {
 
                 if ( StringUtils.isNotEmpty( output ) )
                 {
                     // Reconsider to use WARN / ERROR ?
                     //  getLog().error( output );
                     for ( String outputLine : output.split( "\n" ) )
                     {
                         getLog().error( outputLine );
                     }
                 }
 
                 StringBuilder msg = new StringBuilder( "\nExit code: " );
                 msg.append( exitCode );
                 if ( StringUtils.isNotEmpty( err.getOutput() ) )
                 {
                     msg.append( " - " ).append( err.getOutput() );
                 }
                 msg.append( '\n' );
                 msg.append( "Command line was: " ).append( cmd ).append( '\n' ).append( '\n' );
 
                 throw new MojoExecutionException( msg.toString() );
             }
 
             if ( StringUtils.isNotEmpty( output ) )
             {
                 //getLog().info( output );
                 for ( String outputLine : output.split( "\n" ) )
                 {
                     getLog().info( outputLine );
                 }
             }
 
             return exitCode;
         }
         catch ( CommandLineException e )
         {
             throw new MojoExecutionException( "Unable to execute jlink command: " + e.getMessage(), e );
         }
     }
 }