/*-
    * #%L
    * io.earcam.instrumental.archive.osgi
    * %%
    * Copyright (C) 2018 earcam
    * %%
    * SPDX-License-Identifier: (BSD-3-Clause OR EPL-1.0 OR Apache-2.0 OR MIT)
    * 
    * You <b>must</b> choose to accept, in full - any individual or combination of 
   * the following licenses:
   * <ul>
   * 	<li><a href="https://opensource.org/licenses/BSD-3-Clause">BSD-3-Clause</a></li>
   * 	<li><a href="https://www.eclipse.org/legal/epl-v10.html">EPL-1.0</a></li>
   * 	<li><a href="https://www.apache.org/licenses/LICENSE-2.0">Apache-2.0</a></li>
   * 	<li><a href="https://opensource.org/licenses/MIT">MIT</a></li>
   * </ul>
   * #L%
   */
  package io.earcam.instrumental.archive.osgi.auto;
  
  import static io.earcam.instrumental.module.auto.Classpaths.allClasspaths;
  import static io.earcam.instrumental.module.osgi.BundleManifestHeaders.BUNDLE_SYMBOLICNAME;
  import static java.util.stream.Collectors.toList;
  
  import java.io.IOException;
  import java.nio.file.Path;
  import java.util.List;
  import java.util.Objects;
  import java.util.jar.JarInputStream;
  import java.util.jar.Manifest;
  
  import io.earcam.instrumental.module.osgi.BundleInfo;
  import io.earcam.instrumental.module.osgi.BundleInfoBuilder;
  import io.earcam.unexceptional.Exceptional;
  import io.earcam.utilitarian.io.ExplodedJarInputStream;
  
  /**
   * <p>
   * Extract {@link BundleInfo}s from elements of the classpath.
   * </p>
   */
  public class ClasspathBundles extends AbstractPackageBundleMapper {
  
  	@Override
  	protected List<BundleInfo> bundles()
  	{
  		return allClasspaths()
  				.map(Exceptional.uncheckFunction(ClasspathBundles::bundleInfoFrom))
  				.filter(Objects::nonNull)
  				.collect(toList());
  	}
  
  
  	private static BundleInfo bundleInfoFrom(Path classpathElement) throws IOException
  	{
  		try(JarInputStream jin = ExplodedJarInputStream.jarInputStreamFrom(classpathElement)) {
  			Manifest manifest = jin.getManifest();
  			if(manifest == null || manifest.getMainAttributes().getValue(BUNDLE_SYMBOLICNAME.header()) == null) {
  				return null;
  			}
  			return BundleInfoBuilder.bundleFrom(manifest).construct();
  		}
  	}
  }