package org.apache.maven.it.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.File;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.net.URI;

 import java.net.URISyntaxException;

 import java.net.URL;

 import java.util.Enumeration;

 import java.util.zip.ZipEntry;

 import java.util.zip.ZipFile;

 import org.apache.maven.shared.utils.io.FileUtils;

 import org.apache.maven.shared.utils.io.IOUtil;

 /* @todo this can be replaced with plexus-archiver */

 public class ResourceExtractor

 {

     public static File simpleExtractResources( Class cl, String resourcePath )

         throws IOException

     {

         String tempDirPath = System.getProperty( "maven.test.tmpdir", System.getProperty( "java.io.tmpdir" ) );

         File tempDir = new File( tempDirPath );

         File testDir = new File( tempDir, resourcePath );

         FileUtils.deleteDirectory( testDir );

         testDir = ResourceExtractor.extractResourcePath( cl, resourcePath, tempDir, false );

         return testDir;

     }

     public static File extractResourcePath( String resourcePath, File dest )

         throws IOException

     {

         return extractResourcePath( ResourceExtractor.class, resourcePath, dest );

     }

     public static File extractResourcePath( Class cl, String resourcePath, File dest )

         throws IOException

     {

         return extractResourcePath( cl, resourcePath, dest, false );

     }

     public static File extractResourcePath( Class cl, String resourcePath, File tempDir, boolean alwaysExtract )

         throws IOException

     {

         File dest = new File( tempDir, resourcePath );

         return extractResourceToDestination( cl, resourcePath, dest, alwaysExtract );

     }

     public static File extractResourceToDestination( Class cl, String resourcePath, File destination,

                                                      boolean alwaysExtract )

         throws IOException

     {

         URL url = cl.getResource( resourcePath );

         if ( url == null )

         {

             throw new IllegalArgumentException( "Resource not found: " + resourcePath );

         }

         if ( "jar".equalsIgnoreCase( url.getProtocol() ) )

         {

             File jarFile = getJarFileFromUrl( url );

             extractResourcePathFromJar( cl, jarFile, resourcePath, destination );

         }

         else

         {

             try

             {

                 File resourceFile = new File( new URI( url.toExternalForm() ) );

                 if ( !alwaysExtract )

                 {

                     return resourceFile;

                 }

                 if ( resourceFile.isDirectory() )

                 {

                     FileUtils.copyDirectoryStructure( resourceFile, destination );

                 }

                 else

                 {

                     FileUtils.copyFile( resourceFile, destination );

                 }

             }

             catch ( URISyntaxException e )

             {

                 throw new RuntimeException( "Couldn't convert URL to File:" + url, e );

             }

         }

         return destination;

     }

     private static void extractResourcePathFromJar( Class cl, File jarFile, String resourcePath, File dest )

         throws IOException

     {

         ZipFile z = new ZipFile( jarFile, ZipFile.OPEN_READ );

         String zipStyleResourcePath = resourcePath.substring( 1 ) + "/";

         ZipEntry ze = z.getEntry( zipStyleResourcePath );

         if ( ze != null )

         {

             // DGF If it's a directory, then we need to look at all the entries

             for ( Enumeration entries = z.entries(); entries.hasMoreElements(); )

             {

                 ze = (ZipEntry) entries.nextElement();

                 if ( ze.getName().startsWith( zipStyleResourcePath ) )

                 {

                     String relativePath = ze.getName().substring( zipStyleResourcePath.length() );

                     File destFile = new File( dest, relativePath );

                     if ( ze.isDirectory() )

                     {

                         destFile.mkdirs();

                     }

                     else

                     {

                         FileOutputStream fos = new FileOutputStream( destFile );

                         try

                         {

                             IOUtil.copy( z.getInputStream( ze ), fos );

                         }

                         finally

                         {

                             IOUtil.close( fos );

                         }

                     }

                 }

             }

         }

         else

         {

             FileOutputStream fos = new FileOutputStream( dest );

             try

             {

                 IOUtil.copy( cl.getResourceAsStream( resourcePath ), fos );

             }

             finally

             {

                 IOUtil.close( fos );

             }

         }

     }

     private static File getJarFileFromUrl( URL url )

     {

         if ( !"jar".equalsIgnoreCase( url.getProtocol() ) )

         {

             throw new IllegalArgumentException( "This is not a Jar URL:" + url.toString() );

         }

         String resourceFilePath = url.getFile();

         int index = resourceFilePath.indexOf( "!" );

         if ( index == -1 )

         {

             throw new RuntimeException( "Bug! " + url.toExternalForm() + " does not have a '!'" );

         }

         String jarFileURI = resourceFilePath.substring( 0, index );

         try

         {

             File jarFile = new File( new URI( jarFileURI ) );

             return jarFile;

         }

         catch ( URISyntaxException e )

         {

             throw new RuntimeException( "Bug! URI failed to parse: " + jarFileURI, e );

         }

     }

 }